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<a href="#cogl-2.0-experimental-Sliced-Textures.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="cogl-2.0-experimental-Sliced-Textures"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-Sliced-Textures.top_of_page"></a>Sliced Textures</span></h2>
<p>Sliced Textures — Functions for creating and manipulating 2D meta
textures that may internally be comprised of
multiple 2D textures with power-of-two sizes.</p>
</td>
<td valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-Sliced-Textures.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced">CoglTexture2DSliced</a>;
<a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-texture-2d-sliced-new-with-size" title="cogl_texture_2d_sliced_new_with_size ()">cogl_texture_2d_sliced_new_with_size</a>
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>);
<a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-texture-2d-sliced-new-from-file" title="cogl_texture_2d_sliced_new_from_file ()">cogl_texture_2d_sliced_new_from_file</a>
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);
<a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-texture-2d-sliced-new-from-data" title="cogl_texture_2d_sliced_new_from_data ()">cogl_texture_2d_sliced_new_from_data</a>
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><span class="type">int</span> rowstride</code></em>,
<em class="parameter"><code>const <span class="type">uint8_t</span> *data</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);
<a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-texture-2d-sliced-new-from-bitmap" title="cogl_texture_2d_sliced_new_from_bitmap ()">cogl_texture_2d_sliced_new_from_bitmap</a>
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Bitmap.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a> *bmp</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);
<a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a> <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-is-texture-2d-sliced" title="cogl_is_texture_2d_sliced ()">cogl_is_texture_2d_sliced</a> (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sliced-Textures.description"></a><h2>Description</h2>
<p>
These functions allow high-level meta textures (See the
<a class="link" href="cogl-2.0-experimental-High-Level-Meta-Textures.html#CoglMetaTexture" title="CoglMetaTexture"><span class="type">CoglMetaTexture</span></a> interface) to be allocated that may internally be
comprised of multiple 2D texture "slices" with power-of-two sizes.
</p>
<p>
This API can be useful when working with GPUs that don't have
native support for non-power-of-two textures or if you want to load
a texture that is larger than the GPUs maximum texture size limits.
</p>
<p>
The algorithm for slicing works by first trying to map a virtual
size to the next larger power-of-two size and then seeing how many
wasted pixels that would result in. For example if you have a
virtual texture that's 259 texels wide, the next pot size = 512 and
the amount of waste would be 253 texels. If the amount of waste is
above a max-waste threshold then we would next slice that texture
into one that's 256 texels and then looking at how many more texels
remain unallocated after that we choose the next power-of-two size.
For the example of a 259 texel image that would mean having a 256
texel wide texture, leaving 3 texels unallocated so we'd then
create a 4 texel wide texture - now there is only one texel of
waste. The algorithm continues to slice the right most textures
until the amount of waste is less than or equal to a specfied
max-waste threshold. The same logic for slicing from left to right
is also applied from top to bottom.
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sliced-Textures.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglTexture2DSliced"></a><h3>CoglTexture2DSliced</h3>
<pre class="programlisting">typedef struct _CoglTexture2DSliced CoglTexture2DSliced;</pre>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-sliced-new-with-size"></a><h3>cogl_texture_2d_sliced_new_with_size ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * cogl_texture_2d_sliced_new_with_size
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>);</pre>
<p>
Creates a <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> that may internally be comprised of
1 or more <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures depending on GPU limitations.
For example if the GPU only supports power-of-two sized textures
then a sliced texture will turn a non-power-of-two size into a
combination of smaller power-of-two sized textures. If the
requested texture size is larger than is supported by the hardware
then the texture will be sliced into smaller textures that can be
accessed by the hardware.
</p>
<p>
<em class="parameter"><code>max_waste</code></em> is used as a threshold for recursively slicing the
right-most or bottom-most slices into smaller sizes until the
wasted padding at the bottom and right of the textures is less than
specified. A negative <em class="parameter"><code>max_waste</code></em> will disable slicing.
</p>
<p>
The storage for the texture is not allocated before this function
returns. You can call <code class="function">cogl_texture_allocate()</code> to explicitly
allocate the underlying storage or let Cogl automatically allocate
storage lazily.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>It's possible for the allocation of a sliced texture to fail
later due to impossible slicing constraints if a negative
<em class="parameter"><code>max_waste</code></em> value is given. If the given virtual texture size size
is larger than is supported by the hardware but slicing is disabled
the texture size would be too large to handle.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>The virtual width of your sliced texture.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>The virtual height of your sliced texture.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_waste</code></em> :</span></p></td>
<td>The threshold of how wide a strip of wasted texels
are allowed along the right and bottom textures before
they must be sliced to reduce the amount of waste. A
negative can be passed to disable slicing.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal_format</code></em> :</span></p></td>
<td>The format of the texture</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A new <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> object with no storage
allocated yet. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-sliced-new-from-file"></a><h3>cogl_texture_2d_sliced_new_from_file ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * cogl_texture_2d_sliced_new_from_file
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *filename</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);</pre>
<p>
Creates a <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> from an image file.
</p>
<p>
A <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> may internally be comprised of 1 or more
<a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures depending on GPU limitations. For example
if the GPU only supports power-of-two sized textures then a sliced
texture will turn a non-power-of-two size into a combination of
smaller power-of-two sized textures. If the requested texture size
is larger than is supported by the hardware then the texture will
be sliced into smaller textures that can be accessed by the
hardware.
</p>
<p>
<em class="parameter"><code>max_waste</code></em> is used as a threshold for recursively slicing the
right-most or bottom-most slices into smaller sizes until the
wasted padding at the bottom and right of the textures is less than
specified. A negative <em class="parameter"><code>max_waste</code></em> will disable slicing.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>It's possible for the allocation of a sliced texture to fail
later due to impossible slicing constraints if a negative
<em class="parameter"><code>max_waste</code></em> value is given. If the given virtual texture size is
larger than is supported by the hardware but slicing is disabled
the texture size would be too large to handle.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the file to load</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_waste</code></em> :</span></p></td>
<td>The threshold of how wide a strip of wasted texels
are allowed along the right and bottom textures before
they must be sliced to reduce the amount of waste. A
negative can be passed to disable slicing.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal_format</code></em> :</span></p></td>
<td>the <a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to use for the GPU storage of the
texture. If <a class="link" href="cogl-2.0-experimental-Common-Types.html#COGL-PIXEL-FORMAT-ANY:CAPS"><code class="literal">COGL_PIXEL_FORMAT_ANY</code></a> is given then a premultiplied
format similar to the format of the source data will be used. The
default blending equations of Cogl expect premultiplied color data;
the main use of passing a non-premultiplied format here is if you
have non-premultiplied source data and are going to adjust the blend
mode (see <code class="function">cogl_material_set_blend()</code>) or use the data for something
other than straight blending.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> to catch exceptional errors or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>
or <code class="literal">NULL</code> on failure and <em class="parameter"><code>error</code></em> will be updated. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-sliced-new-from-data"></a><h3>cogl_texture_2d_sliced_new_from_data ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * cogl_texture_2d_sliced_new_from_data
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a> *ctx</code></em>,
<em class="parameter"><code><span class="type">int</span> width</code></em>,
<em class="parameter"><code><span class="type">int</span> height</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><span class="type">int</span> rowstride</code></em>,
<em class="parameter"><code>const <span class="type">uint8_t</span> *data</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);</pre>
<p>
Creates a new <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> texture based on data residing
in memory.
</p>
<p>
A <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> may internally be comprised of 1 or more
<a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures depending on GPU limitations. For example
if the GPU only supports power-of-two sized textures then a sliced
texture will turn a non-power-of-two size into a combination of
smaller power-of-two sized textures. If the requested texture size
is larger than is supported by the hardware then the texture will
be sliced into smaller textures that can be accessed by the
hardware.
</p>
<p>
<em class="parameter"><code>max_waste</code></em> is used as a threshold for recursively slicing the
right-most or bottom-most slices into smaller sizes until the
wasted padding at the bottom and right of the textures is less than
specified. A negative <em class="parameter"><code>max_waste</code></em> will disable slicing.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>It's possible for the allocation of a sliced texture to fail
later due to impossible slicing constraints if a negative
<em class="parameter"><code>max_waste</code></em> value is given. If the given virtual texture size is
larger than is supported by the hardware but slicing is disabled
the texture size would be too large to handle.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>ctx</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#CoglContext" title="CoglContext"><span class="type">CoglContext</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>width of texture in pixels</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>height of texture in pixels</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td>the <a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> the buffer is stored in in RAM</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_waste</code></em> :</span></p></td>
<td>The threshold of how wide a strip of wasted texels
are allowed along the right and bottom textures before
they must be sliced to reduce the amount of waste. A
negative can be passed to disable slicing.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal_format</code></em> :</span></p></td>
<td>the <a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to use for the GPU storage of the
texture. If <a class="link" href="cogl-2.0-experimental-Common-Types.html#COGL-PIXEL-FORMAT-ANY:CAPS"><code class="literal">COGL_PIXEL_FORMAT_ANY</code></a> is given then a premultiplied
format similar to the format of the source data will be used. The
default blending equations of Cogl expect premultiplied color data;
the main use of passing a non-premultiplied format here is if you
have non-premultiplied source data and are going to adjust the blend
mode (see <code class="function">cogl_material_set_blend()</code>) or use the data for something
other than straight blending.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td>the memory offset in bytes between the start of each
row in <em class="parameter"><code>data</code></em>. A value of 0 will make Cogl automatically
calculate <em class="parameter"><code>rowstride</code></em> from <em class="parameter"><code>width</code></em> and <em class="parameter"><code>format</code></em>.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td>pointer the memory region where the source buffer resides</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> to catch exceptional errors or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>
or <code class="literal">NULL</code> on failure and <em class="parameter"><code>error</code></em> will be updated. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-sliced-new-from-bitmap"></a><h3>cogl_texture_2d_sliced_new_from_bitmap ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * cogl_texture_2d_sliced_new_from_bitmap
(<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Bitmap.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a> *bmp</code></em>,
<em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> **error</code></em>);</pre>
<p>
Creates a new <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> texture based on data residing
in a bitmap.
</p>
<p>
A <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> may internally be comprised of 1 or more
<a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures depending on GPU limitations. For example
if the GPU only supports power-of-two sized textures then a sliced
texture will turn a non-power-of-two size into a combination of
smaller power-of-two sized textures. If the requested texture size
is larger than is supported by the hardware then the texture will
be sliced into smaller textures that can be accessed by the
hardware.
</p>
<p>
<em class="parameter"><code>max_waste</code></em> is used as a threshold for recursively slicing the
right-most or bottom-most slices into smaller sizes until the
wasted padding at the bottom and right of the textures is less than
specified. A negative <em class="parameter"><code>max_waste</code></em> will disable slicing.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>It's possible for the allocation of a sliced texture to fail
later due to impossible slicing constraints if a negative
<em class="parameter"><code>max_waste</code></em> value is given. If the given virtual texture size is
larger than is supported by the hardware but slicing is disabled
the texture size would be too large to handle.</div>
<p>
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>bmp</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-Bitmap.html#CoglBitmap" title="CoglBitmap"><span class="type">CoglBitmap</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_waste</code></em> :</span></p></td>
<td>The threshold of how wide a strip of wasted texels
are allowed along the right and bottom textures before
they must be sliced to reduce the amount of waste. A
negative can be passed to disable slicing.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>internal_format</code></em> :</span></p></td>
<td>the <a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to use for the GPU storage of the
texture. If <a class="link" href="cogl-2.0-experimental-Common-Types.html#COGL-PIXEL-FORMAT-ANY:CAPS"><code class="literal">COGL_PIXEL_FORMAT_ANY</code></a> is given then a premultiplied
format similar to the format of the source data will be used. The
default blending equations of Cogl expect premultiplied color data;
the main use of passing a non-premultiplied format here is if you
have non-premultiplied source data and are going to adjust the blend
mode (see <code class="function">cogl_material_set_blend()</code>) or use the data for something
other than straight blending.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-Exception-handling.html#CoglError" title="CoglError"><span class="type">CoglError</span></a> to catch exceptional errors or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly created <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>
or <code class="literal">NULL</code> on failure and <em class="parameter"><code>error</code></em> will be updated. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.16</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-texture-2d-sliced"></a><h3>cogl_is_texture_2d_sliced ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a> cogl_is_texture_2d_sliced (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Gets whether the given object references a <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>.
</p>
<div class="variablelist"><table border="0" class="variablelist">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>object</code></em> :</span></p></td>
<td>A <a class="link" href="cogl-2.0-experimental-The-Object-Interface.html#CoglObject" title="CoglObject"><span class="type">CoglObject</span></a> pointer</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 object references a <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a>
and <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
</div>
</div>
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