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<h2><span class="refentrytitle"><a name="cogl-Materials.top_of_page"></a>Materials</span></h2>
<p>Materials — Fuctions for creating and manipulating materials</p>
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<a name="cogl-Materials.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial">CoglMaterial</a>;
<a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer">CoglMaterialLayer</a>;
<span class="returnvalue">gboolean</span> (<a class="link" href="cogl-Materials.html#CoglMaterialLayerCallback" title="CoglMaterialLayerCallback ()">*CoglMaterialLayerCallback</a>) (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="returnvalue">CoglMaterial</span></a> * <a class="link" href="cogl-Materials.html#cogl-material-new" title="cogl_material_new ()">cogl_material_new</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="returnvalue">CoglMaterial</span></a> * <a class="link" href="cogl-Materials.html#cogl-material-copy" title="cogl_material_copy ()">cogl_material_copy</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *source</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="cogl-Materials.html#cogl-is-material" title="cogl_is_material ()">cogl_is_material</a> (<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> handle</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-color" title="cogl_material_set_color ()">cogl_material_set_color</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-color4ub" title="cogl_material_set_color4ub ()">cogl_material_set_color4ub</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">guint8</span> red</code></em>,
<em class="parameter"><code><span class="type">guint8</span> green</code></em>,
<em class="parameter"><code><span class="type">guint8</span> blue</code></em>,
<em class="parameter"><code><span class="type">guint8</span> alpha</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-color4f" title="cogl_material_set_color4f ()">cogl_material_set_color4f</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> red</code></em>,
<em class="parameter"><code><span class="type">float</span> green</code></em>,
<em class="parameter"><code><span class="type">float</span> blue</code></em>,
<em class="parameter"><code><span class="type">float</span> alpha</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-get-color" title="cogl_material_get_color ()">cogl_material_get_color</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-ambient" title="cogl_material_set_ambient ()">cogl_material_set_ambient</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *ambient</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-get-ambient" title="cogl_material_get_ambient ()">cogl_material_get_ambient</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *ambient</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-diffuse" title="cogl_material_set_diffuse ()">cogl_material_set_diffuse</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *diffuse</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-get-diffuse" title="cogl_material_get_diffuse ()">cogl_material_get_diffuse</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *diffuse</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-ambient-and-diffuse" title="cogl_material_set_ambient_and_diffuse ()">cogl_material_set_ambient_and_diffuse</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-emission" title="cogl_material_set_emission ()">cogl_material_set_emission</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *emission</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-get-emission" title="cogl_material_get_emission ()">cogl_material_get_emission</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *emission</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-specular" title="cogl_material_set_specular ()">cogl_material_set_specular</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *specular</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-get-specular" title="cogl_material_get_specular ()">cogl_material_get_specular</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *specular</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-shininess" title="cogl_material_set_shininess ()">cogl_material_set_shininess</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> shininess</code></em>);
<span class="returnvalue">float</span> <a class="link" href="cogl-Materials.html#cogl-material-get-shininess" title="cogl_material_get_shininess ()">cogl_material_get_shininess</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);
enum <a class="link" href="cogl-Materials.html#CoglMaterialAlphaFunc" title="enum CoglMaterialAlphaFunc">CoglMaterialAlphaFunc</a>;
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-alpha-test-function" title="cogl_material_set_alpha_test_function ()">cogl_material_set_alpha_test_function</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialAlphaFunc" title="enum CoglMaterialAlphaFunc"><span class="type">CoglMaterialAlphaFunc</span></a> alpha_func</code></em>,
<em class="parameter"><code><span class="type">float</span> alpha_reference</code></em>);
#define <a class="link" href="cogl-Materials.html#COGL-BLEND-STRING-ERROR:CAPS" title="COGL_BLEND_STRING_ERROR">COGL_BLEND_STRING_ERROR</a>
enum <a class="link" href="cogl-Materials.html#CoglBlendStringError" title="enum CoglBlendStringError">CoglBlendStringError</a>;
<span class="returnvalue">gboolean</span> <a class="link" href="cogl-Materials.html#cogl-material-set-blend" title="cogl_material_set_blend ()">cogl_material_set_blend</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *blend_string</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-blend-constant" title="cogl_material_set_blend_constant ()">cogl_material_set_blend_constant</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *constant_color</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-point-size" title="cogl_material_set_point_size ()">cogl_material_set_point_size</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> point_size</code></em>);
<span class="returnvalue">float</span> <a class="link" href="cogl-Materials.html#cogl-material-get-point-size" title="cogl_material_get_point_size ()">cogl_material_get_point_size</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer" title="cogl_material_set_layer ()">cogl_material_set_layer</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> texture</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-remove-layer" title="cogl_material_remove_layer ()">cogl_material_remove_layer</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-combine" title="cogl_material_set_layer_combine ()">cogl_material_set_layer_combine</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *blend_string</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-combine-constant" title="cogl_material_set_layer_combine_constant ()">cogl_material_set_layer_combine_constant</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *constant</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-matrix" title="cogl_material_set_layer_matrix ()">cogl_material_set_layer_matrix</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Matrices.html#CoglMatrix" title="CoglMatrix"><span class="type">CoglMatrix</span></a> *matrix</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-point-sprite-coords-enabled" title="cogl_material_set_layer_point_sprite_coords_enabled ()">cogl_material_set_layer_point_sprite_coords_enabled</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> enable</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="cogl-Materials.html#cogl-material-get-layer-point-sprite-coords-enabled" title="cogl_material_get_layer_point_sprite_coords_enabled ()">cogl_material_get_layer_point_sprite_coords_enabled</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);
<span class="returnvalue">int</span> <a class="link" href="cogl-Materials.html#cogl-material-get-n-layers" title="cogl_material_get_n_layers ()">cogl_material_get_n_layers</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);
enum <a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter">CoglMaterialFilter</a>;
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-filters" title="cogl_material_set_layer_filters ()">cogl_material_set_layer_filters</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="type">CoglMaterialFilter</span></a> min_filter</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="type">CoglMaterialFilter</span></a> mag_filter</code></em>);
enum <a class="link" href="cogl-Materials.html#CoglMaterialLayerType" title="enum CoglMaterialLayerType">CoglMaterialLayerType</a>;
<a class="link" href="cogl-Materials.html#CoglMaterialLayerType" title="enum CoglMaterialLayerType"><span class="returnvalue">CoglMaterialLayerType</span></a> <a class="link" href="cogl-Materials.html#cogl-material-layer-get-type" title="cogl_material_layer_get_type ()">cogl_material_layer_get_type</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);
<a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="returnvalue">CoglHandle</span></a> <a class="link" href="cogl-Materials.html#cogl-material-layer-get-texture" title="cogl_material_layer_get_texture ()">cogl_material_layer_get_texture</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="returnvalue">CoglMaterialFilter</span></a> <a class="link" href="cogl-Materials.html#cogl-material-layer-get-min-filter" title="cogl_material_layer_get_min_filter ()">cogl_material_layer_get_min_filter</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="returnvalue">CoglMaterialFilter</span></a> <a class="link" href="cogl-Materials.html#cogl-material-layer-get-mag-filter" title="cogl_material_layer_get_mag_filter ()">cogl_material_layer_get_mag_filter</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);
enum <a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode">CoglMaterialWrapMode</a>;
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode" title="cogl_material_set_layer_wrap_mode ()">cogl_material_set_layer_wrap_mode</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-s" title="cogl_material_set_layer_wrap_mode_s ()">cogl_material_set_layer_wrap_mode_s</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-t" title="cogl_material_set_layer_wrap_mode_t ()">cogl_material_set_layer_wrap_mode_t</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-p" title="cogl_material_set_layer_wrap_mode_p ()">cogl_material_set_layer_wrap_mode_p</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> <a class="link" href="cogl-Materials.html#cogl-material-get-layer-wrap-mode-s" title="cogl_material_get_layer_wrap_mode_s ()">cogl_material_get_layer_wrap_mode_s</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> <a class="link" href="cogl-Materials.html#cogl-material-get-layer-wrap-mode-t" title="cogl_material_get_layer_wrap_mode_t ()">cogl_material_get_layer_wrap_mode_t</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);
<a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> <a class="link" href="cogl-Materials.html#cogl-material-get-layer-wrap-mode-p" title="cogl_material_get_layer_wrap_mode_p ()">cogl_material_get_layer_wrap_mode_p</a>
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);
<span class="returnvalue">GType</span> <a class="link" href="cogl-Materials.html#cogl-material-wrap-mode-get-type" title="cogl_material_wrap_mode_get_type ()">cogl_material_wrap_mode_get_type</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-set-user-program" title="cogl_material_set_user_program ()">cogl_material_set_user_program</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> program</code></em>);
<a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="returnvalue">CoglHandle</span></a> <a class="link" href="cogl-Materials.html#cogl-material-get-user-program" title="cogl_material_get_user_program ()">cogl_material_get_user_program</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);
<span class="returnvalue">void</span> <a class="link" href="cogl-Materials.html#cogl-material-foreach-layer" title="cogl_material_foreach_layer ()">cogl_material_foreach_layer</a> (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayerCallback" title="CoglMaterialLayerCallback ()"><span class="type">CoglMaterialLayerCallback</span></a> callback</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-Materials.description"></a><h2>Description</h2>
<p>
COGL allows creating and manipulating materials used to fill in
geometry. Materials may simply be lighting attributes (such as an
ambient and diffuse colour) or might represent one or more textures
blended together.
</p>
</div>
<div class="refsect1">
<a name="cogl-Materials.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglMaterial"></a><h3>CoglMaterial</h3>
<pre class="programlisting">typedef struct _CoglMaterial CoglMaterial;</pre>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialLayer"></a><h3>CoglMaterialLayer</h3>
<pre class="programlisting">typedef struct _CoglMaterialLayer CoglMaterialLayer;</pre>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialLayerCallback"></a><h3>CoglMaterialLayerCallback ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> (*CoglMaterialLayerCallback) (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);</pre>
<p>
The callback prototype used with <a class="link" href="cogl-Materials.html#cogl-material-foreach-layer" title="cogl_material_foreach_layer ()"><code class="function">cogl_material_foreach_layer()</code></a> for
iterating all the layers of a <em class="parameter"><code>material</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>The <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> whos layers are being iterated</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>The current layer index</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>The private data passed to <a class="link" href="cogl-Materials.html#cogl-material-foreach-layer" title="cogl_material_foreach_layer ()"><code class="function">cogl_material_foreach_layer()</code></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-new"></a><h3>cogl_material_new ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="returnvalue">CoglMaterial</span></a> * cogl_material_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Allocates and initializes a blank white material
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to a new <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a>
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-copy"></a><h3>cogl_material_copy ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="returnvalue">CoglMaterial</span></a> * cogl_material_copy (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *source</code></em>);</pre>
<p>
Creates a new material with the configuration copied from the
source material.
</p>
<p>
We would strongly advise developers to always aim to use
<a class="link" href="cogl-Materials.html#cogl-material-copy" title="cogl_material_copy ()"><code class="function">cogl_material_copy()</code></a> instead of <a class="link" href="cogl-Materials.html#cogl-material-new" title="cogl_material_new ()"><code class="function">cogl_material_new()</code></a> whenever there will
be any similarity between two materials. Copying a material helps Cogl
keep track of a materials ancestry which we may use to help minimize GPU
state changes.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>source</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object to copy</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a pointer to the newly allocated <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.2</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-material"></a><h3>cogl_is_material ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> cogl_is_material (<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> handle</code></em>);</pre>
<p>
Gets whether the given handle references an existing material object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>handle</code></em> :</span></p></td>
<td>A CoglHandle</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if the handle references a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a>,
<code class="literal">FALSE</code> otherwise</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-color"></a><h3>cogl_material_set_color ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_color (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);</pre>
<p>
Sets the basic color of the material, used when no lighting is enabled.
</p>
<p>
Note that if you don't add any layers to the material then the color
will be blended unmodified with the destination; the default blend
expects premultiplied colors: for example, use (0.5, 0.0, 0.0, 0.5) for
semi-transparent red. See <a class="link" href="cogl-Color-Type.html#cogl-color-premultiply" title="cogl_color_premultiply ()"><code class="function">cogl_color_premultiply()</code></a>.
</p>
<p>
The default value is (1.0, 1.0, 1.0, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color</code></em> :</span></p></td>
<td>The components of the color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-color4ub"></a><h3>cogl_material_set_color4ub ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_color4ub (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">guint8</span> red</code></em>,
<em class="parameter"><code><span class="type">guint8</span> green</code></em>,
<em class="parameter"><code><span class="type">guint8</span> blue</code></em>,
<em class="parameter"><code><span class="type">guint8</span> alpha</code></em>);</pre>
<p>
Sets the basic color of the material, used when no lighting is enabled.
</p>
<p>
The default value is (0xff, 0xff, 0xff, 0xff)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>The red component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>The green component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>The blue component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>The alpha component</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-color4f"></a><h3>cogl_material_set_color4f ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_color4f (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> red</code></em>,
<em class="parameter"><code><span class="type">float</span> green</code></em>,
<em class="parameter"><code><span class="type">float</span> blue</code></em>,
<em class="parameter"><code><span class="type">float</span> alpha</code></em>);</pre>
<p>
Sets the basic color of the material, used when no lighting is enabled.
</p>
<p>
The default value is (1.0, 1.0, 1.0, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>red</code></em> :</span></p></td>
<td>The red component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>green</code></em> :</span></p></td>
<td>The green component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blue</code></em> :</span></p></td>
<td>The blue component</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha</code></em> :</span></p></td>
<td>The alpha component</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-color"></a><h3>cogl_material_get_color ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_get_color (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);</pre>
<p>
Retrieves the current material color.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color</code></em> :</span></p></td>
<td>The location to store the color. <span class="annotation">[<acronym title="Parameter for returning results. Default is transfer full."><span class="acronym">out</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-ambient"></a><h3>cogl_material_set_ambient ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_ambient (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *ambient</code></em>);</pre>
<p>
Sets the material's ambient color, in the standard OpenGL lighting
model. The ambient color affects the overall color of the object.
</p>
<p>
Since the diffuse color will be intense when the light hits the surface
directly, the ambient will be most apparent where the light hits at a
slant.
</p>
<p>
The default value is (0.2, 0.2, 0.2, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ambient</code></em> :</span></p></td>
<td>The components of the desired ambient color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-ambient"></a><h3>cogl_material_get_ambient ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_get_ambient (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *ambient</code></em>);</pre>
<p>
Retrieves the current ambient color for <em class="parameter"><code>material</code></em>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ambient</code></em> :</span></p></td>
<td>The location to store the ambient color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-diffuse"></a><h3>cogl_material_set_diffuse ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_diffuse (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *diffuse</code></em>);</pre>
<p>
Sets the material's diffuse color, in the standard OpenGL lighting
model. The diffuse color is most intense where the light hits the
surface directly - perpendicular to the surface.
</p>
<p>
The default value is (0.8, 0.8, 0.8, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>diffuse</code></em> :</span></p></td>
<td>The components of the desired diffuse color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-diffuse"></a><h3>cogl_material_get_diffuse ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_get_diffuse (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *diffuse</code></em>);</pre>
<p>
Retrieves the current diffuse color for <em class="parameter"><code>material</code></em>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>diffuse</code></em> :</span></p></td>
<td>The location to store the diffuse color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-ambient-and-diffuse"></a><h3>cogl_material_set_ambient_and_diffuse ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_ambient_and_diffuse
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *color</code></em>);</pre>
<p>
Conveniently sets the diffuse and ambient color of <em class="parameter"><code>material</code></em> at the same
time. See <a class="link" href="cogl-Materials.html#cogl-material-set-ambient" title="cogl_material_set_ambient ()"><code class="function">cogl_material_set_ambient()</code></a> and <a class="link" href="cogl-Materials.html#cogl-material-set-diffuse" title="cogl_material_set_diffuse ()"><code class="function">cogl_material_set_diffuse()</code></a>.
</p>
<p>
The default ambient color is (0.2, 0.2, 0.2, 1.0)
</p>
<p>
The default diffuse color is (0.8, 0.8, 0.8, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>color</code></em> :</span></p></td>
<td>The components of the desired ambient and diffuse colors</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-emission"></a><h3>cogl_material_set_emission ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_emission (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *emission</code></em>);</pre>
<p>
Sets the material's emissive color, in the standard OpenGL lighting
model. It will look like the surface is a light source emitting this
color.
</p>
<p>
The default value is (0.0, 0.0, 0.0, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>emission</code></em> :</span></p></td>
<td>The components of the desired emissive color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-emission"></a><h3>cogl_material_get_emission ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_get_emission (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *emission</code></em>);</pre>
<p>
Retrieves the materials current emission color.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>emission</code></em> :</span></p></td>
<td>The location to store the emission color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-specular"></a><h3>cogl_material_set_specular ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_specular (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *specular</code></em>);</pre>
<p>
Sets the material's specular color, in the standard OpenGL lighting
model. The intensity of the specular color depends on the viewport
position, and is brightest along the lines of reflection.
</p>
<p>
The default value is (0.0, 0.0, 0.0, 1.0)
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>specular</code></em> :</span></p></td>
<td>The components of the desired specular color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-specular"></a><h3>cogl_material_get_specular ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_get_specular (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *specular</code></em>);</pre>
<p>
Retrieves the materials current specular color.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>specular</code></em> :</span></p></td>
<td>The location to store the specular color</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-shininess"></a><h3>cogl_material_set_shininess ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_shininess (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> shininess</code></em>);</pre>
<p>
Sets the shininess of the material, in the standard OpenGL lighting
model, which determines the size of the specular highlights. A
higher <em class="parameter"><code>shininess</code></em> will produce smaller highlights which makes the
object appear more shiny.
</p>
<p>
The default value is 0.0
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>shininess</code></em> :</span></p></td>
<td>The desired shininess; must be >= 0.0</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-shininess"></a><h3>cogl_material_get_shininess ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span> cogl_material_get_shininess (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);</pre>
<p>
Retrieves the materials current emission color.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The materials current shininess value</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialAlphaFunc"></a><h3>enum CoglMaterialAlphaFunc</h3>
<pre class="programlisting">typedef enum {
COGL_MATERIAL_ALPHA_FUNC_NEVER = 0x0200,
COGL_MATERIAL_ALPHA_FUNC_LESS = 0x0201,
COGL_MATERIAL_ALPHA_FUNC_EQUAL = 0x0202,
COGL_MATERIAL_ALPHA_FUNC_LEQUAL = 0x0203,
COGL_MATERIAL_ALPHA_FUNC_GREATER = 0x0204,
COGL_MATERIAL_ALPHA_FUNC_NOTEQUAL = 0x0205,
COGL_MATERIAL_ALPHA_FUNC_GEQUAL = 0x0206,
COGL_MATERIAL_ALPHA_FUNC_ALWAYS = 0x0207
} CoglMaterialAlphaFunc;
</pre>
<p>
Alpha testing happens before blending primitives with the framebuffer and
gives an opportunity to discard fragments based on a comparison with the
incoming alpha value and a reference alpha value. The <a class="link" href="cogl-Materials.html#CoglMaterialAlphaFunc" title="enum CoglMaterialAlphaFunc"><span class="type">CoglMaterialAlphaFunc</span></a>
determines how the comparison is done.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-NEVER:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_NEVER</code></span></p></td>
<td>Never let the fragment through.
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-LESS:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_LESS</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value is less than the reference alpha value
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-EQUAL:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_EQUAL</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value equals the reference alpha value
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-LEQUAL:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_LEQUAL</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value is less than or equal to the reference alpha value
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-GREATER:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_GREATER</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value is greater than the reference alpha value
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-NOTEQUAL:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_NOTEQUAL</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value does not equal the reference alpha value
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-GEQUAL:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_GEQUAL</code></span></p></td>
<td>Let the fragment through if the incoming
alpha value is greater than or equal to the reference alpha value.
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-ALPHA-FUNC-ALWAYS:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_ALWAYS</code></span></p></td>
<td>Always let the fragment through.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-alpha-test-function"></a><h3>cogl_material_set_alpha_test_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_alpha_test_function
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialAlphaFunc" title="enum CoglMaterialAlphaFunc"><span class="type">CoglMaterialAlphaFunc</span></a> alpha_func</code></em>,
<em class="parameter"><code><span class="type">float</span> alpha_reference</code></em>);</pre>
<p>
Before a primitive is blended with the framebuffer, it goes through an
alpha test stage which lets you discard fragments based on the current
alpha value. This function lets you change the function used to evaluate
the alpha channel, and thus determine which fragments are discarded
and which continue on to the blending stage.
</p>
<p>
The default is <a class="link" href="cogl-Materials.html#COGL-MATERIAL-ALPHA-FUNC-ALWAYS:CAPS"><code class="literal">COGL_MATERIAL_ALPHA_FUNC_ALWAYS</code></a>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha_func</code></em> :</span></p></td>
<td>A <em class="parameter"><code>CoglMaterialAlphaFunc</code></em> constant</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>alpha_reference</code></em> :</span></p></td>
<td>A reference point that the chosen alpha function uses
to compare incoming fragments to.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="COGL-BLEND-STRING-ERROR:CAPS"></a><h3>COGL_BLEND_STRING_ERROR</h3>
<pre class="programlisting">#define COGL_BLEND_STRING_ERROR (cogl_blend_string_error_quark ())
</pre>
<p>
<span class="type">GError</span> domain for blend string parser errors
</p>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglBlendStringError"></a><h3>enum CoglBlendStringError</h3>
<pre class="programlisting">typedef enum {
/*< prefix=COGL_BLEND_STRING_ERROR >*/
COGL_BLEND_STRING_ERROR_PARSE_ERROR,
COGL_BLEND_STRING_ERROR_ARGUMENT_PARSE_ERROR,
COGL_BLEND_STRING_ERROR_INVALID_ERROR,
COGL_BLEND_STRING_ERROR_GPU_UNSUPPORTED_ERROR
} CoglBlendStringError;
</pre>
<p>
Error enumeration for the blend strings parser
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="COGL-BLEND-STRING-ERROR-PARSE-ERROR:CAPS"></a><span class="term"><code class="literal">COGL_BLEND_STRING_ERROR_PARSE_ERROR</code></span></p></td>
<td>Generic parse error
</td>
</tr>
<tr>
<td><p><a name="COGL-BLEND-STRING-ERROR-ARGUMENT-PARSE-ERROR:CAPS"></a><span class="term"><code class="literal">COGL_BLEND_STRING_ERROR_ARGUMENT_PARSE_ERROR</code></span></p></td>
<td>Argument parse error
</td>
</tr>
<tr>
<td><p><a name="COGL-BLEND-STRING-ERROR-INVALID-ERROR:CAPS"></a><span class="term"><code class="literal">COGL_BLEND_STRING_ERROR_INVALID_ERROR</code></span></p></td>
<td>Internal parser error
</td>
</tr>
<tr>
<td><p><a name="COGL-BLEND-STRING-ERROR-GPU-UNSUPPORTED-ERROR:CAPS"></a><span class="term"><code class="literal">COGL_BLEND_STRING_ERROR_GPU_UNSUPPORTED_ERROR</code></span></p></td>
<td>Blend string not
supported by the GPU
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-blend"></a><h3>cogl_material_set_blend ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> cogl_material_set_blend (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *blend_string</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
If not already familiar; please refer <a class="link" href="cogl-Blend-Strings.html" title="Material Blend Strings">here</a>
for an overview of what blend strings are, and their syntax.
</p>
<p>
Blending occurs after the alpha test function, and combines fragments with
the framebuffer.
</p>
<p>
Currently the only blend function Cogl exposes is <code class="function">ADD()</code>. So any valid
blend statements will be of the form:
</p>
<p>
</p>
<div class="informalexample"><pre class="programlisting">
<channel-mask>=ADD(SRC_COLOR*(<factor>), DST_COLOR*(<factor>))
</pre></div>
<p>
</p>
<p>
</p>
<div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Warning</h3>The brackets around blend factors are currently not
optional!</div>
<p>
</p>
<p>
This is the list of source-names usable as blend factors:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>SRC_COLOR: The color of the in comming fragment</p></li>
<li class="listitem"><p>DST_COLOR: The color of the framebuffer</p></li>
<li class="listitem"><p>CONSTANT: The constant set via <a class="link" href="cogl-Materials.html#cogl-material-set-blend-constant" title="cogl_material_set_blend_constant ()"><code class="function">cogl_material_set_blend_constant()</code></a></p></li>
</ul></div>
<p>
</p>
<p>
The source names can be used according to the
<a class="link" href="cogl-Blend-Strings.html#cogl-Blend-String-syntax" title="Here's the syntax">color-source and factor syntax</a>,
so for example "(1-SRC_COLOR[A])" would be a valid factor, as would
"(CONSTANT[RGB])"
</p>
<p>
These can also be used as factors:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">0: (0, 0, 0, 0)</li>
<li class="listitem">1: (1, 1, 1, 1)</li>
<li class="listitem">SRC_ALPHA_SATURATE_FACTOR: (f,f,f,1) where f = MIN(SRC_COLOR[A],1-DST_COLOR[A])</li>
</ul></div>
<p>
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>Remember; all color components are normalized to the range [0, 1]
before computing the result of blending.</div>
<p>
</p>
<p>
</p>
<div class="example">
<a name="cogl-Blend-Strings-blend-unpremul"></a><p class="title"><b>Example 1. Blend Strings/1</b></p>
<div class="example-contents">
<p>Blend a non-premultiplied source over a destination with
premultiplied alpha:</p>
<pre class="programlisting">
"RGB = ADD(SRC_COLOR*(SRC_COLOR[A]), DST_COLOR*(1-SRC_COLOR[A]))"
"A = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
</pre>
</div>
</div>
<p><br class="example-break">
</p>
<p>
</p>
<div class="example">
<a name="cogl-Blend-Strings-blend-premul"></a><p class="title"><b>Example 2. Blend Strings/2</b></p>
<div class="example-contents">
<p>Blend a premultiplied source over a destination with
premultiplied alpha</p>
<pre class="programlisting">
"RGBA = ADD(SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))"
</pre>
</div>
</div>
<p><br class="example-break">
</p>
<p>
The default blend string is:
</p>
<div class="informalexample"><pre class="programlisting">
RGBA = ADD (SRC_COLOR, DST_COLOR*(1-SRC_COLOR[A]))
</pre></div>
<p>
</p>
<p>
That gives normal alpha-blending when the calculated color for the material
is in premultiplied form.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blend_string</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Blend-Strings.html" title="Material Blend Strings">Cogl blend string</a>
describing the desired blend function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>return location for a <span class="type">GError</span> that may report lack of driver
support if you give separate blend string statements for the alpha
channel and RGB channels since some drivers, or backends such as
GLES 1.1, don't support this feature. May be <code class="literal">NULL</code>, in which case a
warning will be printed out using GLib's logging facilities if an
error is encountered.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if the blend string was successfully parsed, and the
described blending is supported by the underlying driver/hardware. If
there was an error, <code class="literal">FALSE</code> is returned and <em class="parameter"><code>error</code></em> is set accordingly (if
present).</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-blend-constant"></a><h3>cogl_material_set_blend_constant ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_blend_constant (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *constant_color</code></em>);</pre>
<p>
When blending is setup to reference a CONSTANT blend factor then
blending will depend on the constant set with this function.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>constant_color</code></em> :</span></p></td>
<td>The constant color you want</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-point-size"></a><h3>cogl_material_set_point_size ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_point_size (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">float</span> point_size</code></em>);</pre>
<p>
Changes the size of points drawn when <a class="link" href="cogl-Vertex-Buffers.html#COGL-VERTICES-MODE-POINTS:CAPS"><code class="literal">COGL_VERTICES_MODE_POINTS</code></a> is
used with the vertex buffer API. Note that typically the GPU will
only support a limited minimum and maximum range of point sizes. If
the chosen point size is outside that range then the nearest value
within that range will be used instead. The size of a point is in
screen space so it will be the same regardless of any
transformations. The default point size is 1.0.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a material.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>point_size</code></em> :</span></p></td>
<td>the new point size.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-point-size"></a><h3>cogl_material_get_point_size ()</h3>
<pre class="programlisting"><span class="returnvalue">float</span> cogl_material_get_point_size (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);</pre>
<p>
Get the size of points drawn when <a class="link" href="cogl-Vertex-Buffers.html#COGL-VERTICES-MODE-POINTS:CAPS"><code class="literal">COGL_VERTICES_MODE_POINTS</code></a> is
used with the vertex buffer API.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to a material.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the point size of the material.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer"></a><h3>cogl_material_set_layer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> texture</code></em>);</pre>
<p>
In addition to the standard OpenGL lighting model a Cogl material may have
one or more layers comprised of textures that can be blended together in
order, with a number of different texture combine modes. This function
defines a new texture layer.
</p>
<p>
The index values of multiple layers do not have to be consecutive; it is
only their relative order that is important.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>In the future, we may define other types of material layers, such
as purely GLSL based layers.</div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the index of the layer</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>texture</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for the layer object</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-remove-layer"></a><h3>cogl_material_remove_layer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_remove_layer (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);</pre>
<p>
This function removes a layer from your material
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>Specifies the layer you want to remove</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-combine"></a><h3>cogl_material_set_layer_combine ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> cogl_material_set_layer_combine (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *blend_string</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
If not already familiar; you can refer
<a class="link" href="cogl-Blend-Strings.html" title="Material Blend Strings">here</a> for an overview of what blend
strings are and there syntax.
</p>
<p>
These are all the functions available for texture combining:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">REPLACE(arg0) = arg0</li>
<li class="listitem">MODULATE(arg0, arg1) = arg0 x arg1</li>
<li class="listitem">ADD(arg0, arg1) = arg0 + arg1</li>
<li class="listitem">ADD_SIGNED(arg0, arg1) = arg0 + arg1 - 0.5</li>
<li class="listitem">INTERPOLATE(arg0, arg1, arg2) = arg0 x arg2 + arg1 x (1 - arg2)</li>
<li class="listitem">SUBTRACT(arg0, arg1) = arg0 - arg1</li>
<li class="listitem"><pre class="programlisting">
DOT3_RGB(arg0, arg1) = 4 x ((arg0[R] - 0.5)) * (arg1[R] - 0.5) +
(arg0[G] - 0.5)) * (arg1[G] - 0.5) +
(arg0[B] - 0.5)) * (arg1[B] - 0.5))
</pre></li>
<li class="listitem"><pre class="programlisting">
DOT3_RGBA(arg0, arg1) = 4 x ((arg0[R] - 0.5)) * (arg1[R] - 0.5) +
(arg0[G] - 0.5)) * (arg1[G] - 0.5) +
(arg0[B] - 0.5)) * (arg1[B] - 0.5))
</pre></li>
</ul></div>
<p>
</p>
<p>
Refer to the
<a class="link" href="cogl-Blend-Strings.html#cogl-Blend-String-syntax" title="Here's the syntax">color-source syntax</a> for
describing the arguments. The valid source names for texture combining
are:
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term">TEXTURE</span></p></td>
<td>Use the color from the current texture layer</td>
</tr>
<tr>
<td><p><span class="term">TEXTURE_0, TEXTURE_1, etc</span></p></td>
<td>Use the color from the specified texture layer</td>
</tr>
<tr>
<td><p><span class="term">CONSTANT</span></p></td>
<td>Use the color from the constant given with
<code class="function">cogl_material_set_layer_constant()</code>
</td>
</tr>
<tr>
<td><p><span class="term">PRIMARY</span></p></td>
<td>Use the color of the material as set with
<a class="link" href="cogl-Materials.html#cogl-material-set-color" title="cogl_material_set_color ()"><code class="function">cogl_material_set_color()</code></a>
</td>
</tr>
<tr>
<td><p><span class="term">PREVIOUS</span></p></td>
<td>Either use the texture color from the previous layer, or
if this is layer 0, use the color of the material as set with
<a class="link" href="cogl-Materials.html#cogl-material-set-color" title="cogl_material_set_color ()"><code class="function">cogl_material_set_color()</code></a>
</td>
</tr>
</tbody>
</table></div>
<p>
</p>
<p>
</p>
<div class="refsect2">
<a name="cogl-Layer-Combine-Examples"></a><h3>Layer Combine Examples</h3>
<p>This is effectively what the default blending is:</p>
<div class="informalexample"><pre class="programlisting">
RGBA = MODULATE (PREVIOUS, TEXTURE)
</pre></div>
<p>This could be used to cross-fade between two images, using
the alpha component of a constant as the interpolator. The constant
color is given by calling cogl_material_set_layer_constant.</p>
<div class="informalexample"><pre class="programlisting">
RGBA = INTERPOLATE (PREVIOUS, TEXTURE, CONSTANT[A])
</pre></div>
</div>
<p>
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>You can't give a multiplication factor for arguments as you can
with blending.</div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>Specifies the layer you want define a combine function for</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>blend_string</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Blend-Strings.html" title="Material Blend Strings">Cogl blend string</a>
describing the desired texture combine function.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <span class="type">GError</span> that may report parse errors or lack of GPU/driver
support. May be <code class="literal">NULL</code>, in which case a warning will be printed out if an
error is encountered.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if the blend string was successfully parsed, and the
described texture combining is supported by the underlying driver and
or hardware. On failure, <code class="literal">FALSE</code> is returned and <em class="parameter"><code>error</code></em> is set</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-combine-constant"></a><h3>cogl_material_set_layer_combine_constant ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_combine_constant
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Color-Type.html#CoglColor" title="struct CoglColor"><span class="type">CoglColor</span></a> *constant</code></em>);</pre>
<p>
When you are using the 'CONSTANT' color source in a layer combine
description then you can use this function to define its value.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>Specifies the layer you want to specify a constant used
for texture combining</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>constant</code></em> :</span></p></td>
<td>The constant color you want</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-matrix"></a><h3>cogl_material_set_layer_matrix ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_matrix (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code>const <a class="link" href="cogl-Matrices.html#CoglMatrix" title="CoglMatrix"><span class="type">CoglMatrix</span></a> *matrix</code></em>);</pre>
<p>
This function lets you set a matrix that can be used to e.g. translate
and rotate a single layer of a material used to fill your geometry.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the index for the layer inside <em class="parameter"><code>material</code></em>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>matrix</code></em> :</span></p></td>
<td>the transformation matrix for the layer</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-point-sprite-coords-enabled"></a><h3>cogl_material_set_layer_point_sprite_coords_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> cogl_material_set_layer_point_sprite_coords_enabled
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><span class="type">gboolean</span> enable</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
When rendering points, if <em class="parameter"><code>enable</code></em> is <code class="literal">TRUE</code> then the texture
coordinates for this layer will be replaced with coordinates that
vary from 0.0 to 1.0 across the primitive. The top left of the
point will have the coordinates 0.0,0.0 and the bottom right will
have 1.0,1.0. If <em class="parameter"><code>enable</code></em> is <code class="literal">FALSE</code> then the coordinates will be
fixed for the entire point.
</p>
<p>
This function will only work if <a class="link" href="cogl-General-API.html#COGL-FEATURE-POINT-SPRITE:CAPS"><code class="literal">COGL_FEATURE_POINT_SPRITE</code></a> is
available. If the feature is not available then the function will
return <code class="literal">FALSE</code> and set <em class="parameter"><code>error</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to a material.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>enable</code></em> :</span></p></td>
<td>whether to enable point sprite coord generation.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A return location for a GError, or NULL to ignore errors.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> if the function succeeds, <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-layer-point-sprite-coords-enabled"></a><h3>cogl_material_get_layer_point_sprite_coords_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> cogl_material_get_layer_point_sprite_coords_enabled
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);</pre>
<p>
Gets whether point sprite coordinate generation is enabled for this
texture layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to a material.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to check.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>whether the texture coordinates will be replaced with
point sprite coordinates.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-n-layers"></a><h3>cogl_material_get_n_layers ()</h3>
<pre class="programlisting"><span class="returnvalue">int</span> cogl_material_get_n_layers (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);</pre>
<p>
Retrieves the number of layers defined for the given <em class="parameter"><code>material</code></em>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the number of layers</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialFilter"></a><h3>enum CoglMaterialFilter</h3>
<pre class="programlisting">typedef enum {
COGL_MATERIAL_FILTER_NEAREST = 0x2600,
COGL_MATERIAL_FILTER_LINEAR = 0x2601,
COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST = 0x2700,
COGL_MATERIAL_FILTER_LINEAR_MIPMAP_NEAREST = 0x2701,
COGL_MATERIAL_FILTER_NEAREST_MIPMAP_LINEAR = 0x2702,
COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR = 0x2703
} CoglMaterialFilter;
</pre>
<p>
Texture filtering is used whenever the current pixel maps either to more
than one texture element (texel) or less than one. These filter enums
correspond to different strategies used to come up with a pixel color, by
possibly referring to multiple neighbouring texels and taking a weighted
average or simply using the nearest texel.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-NEAREST:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_NEAREST</code></span></p></td>
<td>Measuring in manhatten distance from the,
current pixel center, use the nearest texture texel
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-LINEAR:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_LINEAR</code></span></p></td>
<td>Use the weighted average of the 4 texels
nearest the current pixel center
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-NEAREST-MIPMAP-NEAREST:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_NEAREST_MIPMAP_NEAREST</code></span></p></td>
<td>Select the mimap level whose
texel size most closely matches the current pixel, and use the
<a class="link" href="cogl-Materials.html#COGL-MATERIAL-FILTER-NEAREST:CAPS"><code class="literal">COGL_MATERIAL_FILTER_NEAREST</code></a> criterion
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-LINEAR-MIPMAP-NEAREST:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_LINEAR_MIPMAP_NEAREST</code></span></p></td>
<td>Select the mimap level whose
texel size most closely matches the current pixel, and use the
<a class="link" href="cogl-Materials.html#COGL-MATERIAL-FILTER-LINEAR:CAPS"><code class="literal">COGL_MATERIAL_FILTER_LINEAR</code></a> criterion
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-NEAREST-MIPMAP-LINEAR:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_NEAREST_MIPMAP_LINEAR</code></span></p></td>
<td>Select the two mimap levels
whose texel size most closely matches the current pixel, use
the <a class="link" href="cogl-Materials.html#COGL-MATERIAL-FILTER-NEAREST:CAPS"><code class="literal">COGL_MATERIAL_FILTER_NEAREST</code></a> criterion on each one and take
their weighted average
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-FILTER-LINEAR-MIPMAP-LINEAR:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_FILTER_LINEAR_MIPMAP_LINEAR</code></span></p></td>
<td>Select the two mimap levels
whose texel size most closely matches the current pixel, use
the <a class="link" href="cogl-Materials.html#COGL-MATERIAL-FILTER-LINEAR:CAPS"><code class="literal">COGL_MATERIAL_FILTER_LINEAR</code></a> criterion on each one and take
their weighted average
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-filters"></a><h3>cogl_material_set_layer_filters ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_filters (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="type">CoglMaterialFilter</span></a> min_filter</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="type">CoglMaterialFilter</span></a> mag_filter</code></em>);</pre>
<p>
Changes the decimation and interpolation filters used when a texture is
drawn at other scales than 100%.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>min_filter</code></em> :</span></p></td>
<td>the filter used when scaling a texture down.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mag_filter</code></em> :</span></p></td>
<td>the filter used when magnifying a texture.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialLayerType"></a><h3>enum CoglMaterialLayerType</h3>
<pre class="programlisting">typedef enum {
COGL_MATERIAL_LAYER_TYPE_TEXTURE
} CoglMaterialLayerType;
</pre>
<p>
Available types of layers for a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a>. This enumeration
might be expanded in later versions.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><a name="COGL-MATERIAL-LAYER-TYPE-TEXTURE:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_LAYER_TYPE_TEXTURE</code></span></p></td>
<td>The layer represents a
<a class="link" href="cogl-Textures.html" title="Textures">texture</a>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 1.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-layer-get-type"></a><h3>cogl_material_layer_get_type ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialLayerType" title="enum CoglMaterialLayerType"><span class="returnvalue">CoglMaterialLayerType</span></a> cogl_material_layer_get_type (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);</pre>
<p>
Retrieves the type of the layer
</p>
<p>
Currently there is only one type of layer defined:
<a class="link" href="cogl-Materials.html#COGL-MATERIAL-LAYER-TYPE-TEXTURE:CAPS"><code class="literal">COGL_MATERIAL_LAYER_TYPE_TEXTURE</code></a>, but considering we may add purely GLSL
based layers in the future, you should write code that checks the type
first.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the type of the layer</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-layer-get-texture"></a><h3>cogl_material_layer_get_texture ()</h3>
<pre class="programlisting"><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="returnvalue">CoglHandle</span></a> cogl_material_layer_get_texture (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);</pre>
<p>
Extracts a texture handle for a specific layer.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>In the future Cogl may support purely GLSL based layers; for those
layers this function which will likely return <a class="link" href="cogl-General-API.html#COGL-INVALID-HANDLE:CAPS" title="COGL_INVALID_HANDLE"><code class="literal">COGL_INVALID_HANDLE</code></a> if you
try to get the texture handle from them. Considering this scenario, you
should call <a class="link" href="cogl-Materials.html#cogl-material-layer-get-type" title="cogl_material_layer_get_type ()"><code class="function">cogl_material_layer_get_type()</code></a> first in order check it is of
type <a class="link" href="cogl-Materials.html#COGL-MATERIAL-LAYER-TYPE-TEXTURE:CAPS"><code class="literal">COGL_MATERIAL_LAYER_TYPE_TEXTURE</code></a> before calling this function.</div>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for the texture inside the layer. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-layer-get-min-filter"></a><h3>cogl_material_layer_get_min_filter ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="returnvalue">CoglMaterialFilter</span></a> cogl_material_layer_get_min_filter (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);</pre>
<p>
Queries the currently set downscaling filter for a material layer
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a material layer</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current downscaling filter</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-layer-get-mag-filter"></a><h3>cogl_material_layer_get_mag_filter ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialFilter" title="enum CoglMaterialFilter"><span class="returnvalue">CoglMaterialFilter</span></a> cogl_material_layer_get_mag_filter (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> *layer</code></em>);</pre>
<p>
Queries the currently set downscaling filter for a material later
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterialLayer" title="CoglMaterialLayer"><span class="type">CoglMaterialLayer</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the current downscaling filter</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2">
<a name="CoglMaterialWrapMode"></a><h3>enum CoglMaterialWrapMode</h3>
<pre class="programlisting">typedef enum {
COGL_MATERIAL_WRAP_MODE_REPEAT = 0x2901,
COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE = 0x812F,
COGL_MATERIAL_WRAP_MODE_AUTOMATIC = 0x0207
} CoglMaterialWrapMode;
</pre>
<p>
The wrap mode specifies what happens when texture coordinates
outside the range 0→1 are used. Note that if the filter mode is
anything but <a class="link" href="cogl-Materials.html#COGL-MATERIAL-FILTER-NEAREST:CAPS"><code class="literal">COGL_MATERIAL_FILTER_NEAREST</code></a> then texels outside the
range 0→1 might be used even when the coordinate is exactly 0 or 1
because OpenGL will try to sample neighbouring pixels. For example
if you are trying to render the full texture then you may get
artifacts around the edges when the pixels from the other side are
merged in if the wrap mode is set to repeat.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="COGL-MATERIAL-WRAP-MODE-REPEAT:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_WRAP_MODE_REPEAT</code></span></p></td>
<td>The texture will be repeated. This
is useful for example to draw a tiled background.
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-WRAP-MODE-CLAMP-TO-EDGE:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_WRAP_MODE_CLAMP_TO_EDGE</code></span></p></td>
<td>The coordinates outside the
range 0→1 will sample copies of the edge pixels of the
texture. This is useful to avoid artifacts if only one copy of
the texture is being rendered.
</td>
</tr>
<tr>
<td><p><a name="COGL-MATERIAL-WRAP-MODE-AUTOMATIC:CAPS"></a><span class="term"><code class="literal">COGL_MATERIAL_WRAP_MODE_AUTOMATIC</code></span></p></td>
<td>Cogl will try to automatically
decide which of the above two to use. For <a class="link" href="cogl-Primitives.html#cogl-rectangle" title="cogl_rectangle ()"><code class="function">cogl_rectangle()</code></a>, it
will use repeat mode if any of the texture coordinates are
outside the range 0→1, otherwise it will use clamp to edge. For
<a class="link" href="cogl-Primitives.html#cogl-polygon" title="cogl_polygon ()"><code class="function">cogl_polygon()</code></a> it will always use repeat mode. For
<a class="link" href="cogl-Vertex-Buffers.html#cogl-vertex-buffer-draw" title="cogl_vertex_buffer_draw ()"><code class="function">cogl_vertex_buffer_draw()</code></a> it will use repeat mode except for
layers that have point sprite coordinate generation enabled. This
is the default value.
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-wrap-mode"></a><h3>cogl_material_set_layer_wrap_mode ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_wrap_mode (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);</pre>
<p>
Sets the wrap mode for all three coordinates of texture lookups on
this layer. This is equivalent to calling
<a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-s" title="cogl_material_set_layer_wrap_mode_s ()"><code class="function">cogl_material_set_layer_wrap_mode_s()</code></a>,
<a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-t" title="cogl_material_set_layer_wrap_mode_t ()"><code class="function">cogl_material_set_layer_wrap_mode_t()</code></a> and
<a class="link" href="cogl-Materials.html#cogl-material-set-layer-wrap-mode-p" title="cogl_material_set_layer_wrap_mode_p ()"><code class="function">cogl_material_set_layer_wrap_mode_p()</code></a> separately.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the new wrap mode</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-wrap-mode-s"></a><h3>cogl_material_set_layer_wrap_mode_s ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_wrap_mode_s (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);</pre>
<p>
Sets the wrap mode for the 's' coordinate of texture lookups on this layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the new wrap mode</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-wrap-mode-t"></a><h3>cogl_material_set_layer_wrap_mode_t ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_wrap_mode_t (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);</pre>
<p>
Sets the wrap mode for the 't' coordinate of texture lookups on this layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the new wrap mode</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-layer-wrap-mode-p"></a><h3>cogl_material_set_layer_wrap_mode_p ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_layer_wrap_mode_p (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="type">CoglMaterialWrapMode</span></a> mode</code></em>);</pre>
<p>
Sets the wrap mode for the 'p' coordinate of texture lookups on
this layer. 'p' is the third coordinate.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>mode</code></em> :</span></p></td>
<td>the new wrap mode</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-layer-wrap-mode-s"></a><h3>cogl_material_get_layer_wrap_mode_s ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> cogl_material_get_layer_wrap_mode_s
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);</pre>
<p>
Returns the wrap mode for the 's' coordinate of texture lookups on this
layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the wrap mode for the 's' coordinate of texture lookups on
this layer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-layer-wrap-mode-t"></a><h3>cogl_material_get_layer_wrap_mode_t ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> cogl_material_get_layer_wrap_mode_t
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);</pre>
<p>
Returns the wrap mode for the 't' coordinate of texture lookups on this
layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the wrap mode for the 't' coordinate of texture lookups on
this layer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-layer-wrap-mode-p"></a><h3>cogl_material_get_layer_wrap_mode_p ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Materials.html#CoglMaterialWrapMode" title="enum CoglMaterialWrapMode"><span class="returnvalue">CoglMaterialWrapMode</span></a> cogl_material_get_layer_wrap_mode_p
(<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><span class="type">int</span> layer_index</code></em>);</pre>
<p>
Returns the wrap mode for the 'p' coordinate of texture lookups on this
layer.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>layer_index</code></em> :</span></p></td>
<td>the layer number to change.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the wrap mode for the 'p' coordinate of texture lookups on
this layer.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.6</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-wrap-mode-get-type"></a><h3>cogl_material_wrap_mode_get_type ()</h3>
<pre class="programlisting"><span class="returnvalue">GType</span> cogl_material_wrap_mode_get_type (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-set-user-program"></a><h3>cogl_material_set_user_program ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_set_user_program (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> program</code></em>);</pre>
<p>
Associates a linked CoglProgram with the given material so that the
program can take full control of vertex and/or fragment processing.
</p>
<p>
This is an example of how it can be used to associate an ARBfp
program with a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a>:
</p>
<div class="informalexample"><pre class="programlisting">
CoglHandle shader;
CoglHandle program;
CoglMaterial *material;
shader = cogl_create_shader (COGL_SHADER_TYPE_FRAGMENT);
cogl_shader_source (shader,
"!!ARBfp1.0\n"
"MOV result.color,fragment.color;\n"
"END\n");
cogl_shader_compile (shader);
program = cogl_create_program ();
cogl_program_attach_shader (program, shader);
cogl_program_link (program);
material = cogl_material_new ();
cogl_material_set_user_program (material, program);
cogl_set_source_color4ub (0xff, 0x00, 0x00, 0xff);
cogl_rectangle (0, 0, 100, 100);
</pre></div>
<p>
</p>
<p>
It is possibly worth keeping in mind that this API is not part of
the long term design for how we want to expose shaders to Cogl
developers (We are planning on deprecating the cogl_program and
cogl_shader APIs in favour of a "snippet" framework) but in the
meantime we hope this will handle most practical GLSL and ARBfp
requirements.
</p>
<p>
Also remember you need to check for either the
<a class="link" href="cogl-General-API.html#COGL-FEATURE-SHADERS-GLSL:CAPS"><code class="literal">COGL_FEATURE_SHADERS_GLSL</code></a> or <a class="link" href="cogl-General-API.html#COGL-FEATURE-SHADERS-ARBFP:CAPS"><code class="literal">COGL_FEATURE_SHADERS_ARBFP</code></a> before
using the cogl_program or cogl_shader API.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>program</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to a linked CoglProgram</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-get-user-program"></a><h3>cogl_material_get_user_program ()</h3>
<pre class="programlisting"><a class="link" href="cogl-General-API.html#CoglHandle" title="CoglHandle"><span class="returnvalue">CoglHandle</span></a> cogl_material_get_user_program (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>);</pre>
<p>
Queries what user program has been associated with the given
<em class="parameter"><code>material</code></em> using <a class="link" href="cogl-Materials.html#cogl-material-set-user-program" title="cogl_material_set_user_program ()"><code class="function">cogl_material_set_user_program()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>a <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object.</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>The current user program
or <a class="link" href="cogl-General-API.html#COGL-INVALID-HANDLE:CAPS" title="COGL_INVALID_HANDLE"><code class="literal">COGL_INVALID_HANDLE</code></a>. <span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-material-foreach-layer"></a><h3>cogl_material_foreach_layer ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span> cogl_material_foreach_layer (<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> *material</code></em>,
<em class="parameter"><code><a class="link" href="cogl-Materials.html#CoglMaterialLayerCallback" title="CoglMaterialLayerCallback ()"><span class="type">CoglMaterialLayerCallback</span></a> callback</code></em>,
<em class="parameter"><code><span class="type">void</span> *user_data</code></em>);</pre>
<p>
Iterates all the layer indices of the given <em class="parameter"><code>material</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>material</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterial" title="CoglMaterial"><span class="type">CoglMaterial</span></a> object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>callback</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-Materials.html#CoglMaterialLayerCallback" title="CoglMaterialLayerCallback ()"><span class="type">CoglMaterialLayerCallback</span></a> to be called for each layer
index</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>user_data</code></em> :</span></p></td>
<td>Private data that will be passed to the callback</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.4</p>
<p class="stability">Stability Level: Unstable</p>
</div>
</div>
</div>
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