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<title>Cogl 2.0 Reference Manual: Depth State</title>
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<a name="cogl-2.0-experimental-Depth-State"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
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<h2><span class="refentrytitle"><a name="cogl-2.0-experimental-Depth-State.top_of_page"></a>Depth State</span></h2>
<p>Depth State — Functions for describing the depth testing
state of your GPU.</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Depth-State.functions"></a><h2>Functions</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-init" title="cogl_depth_state_init ()">cogl_depth_state_init</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-enabled" title="cogl_depth_state_set_test_enabled ()">cogl_depth_state_set_test_enabled</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-get-test-enabled" title="cogl_depth_state_get_test_enabled ()">cogl_depth_state_get_test_enabled</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-function" title="cogl_depth_state_set_test_function ()">cogl_depth_state_set_test_function</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="returnvalue">CoglDepthTestFunction</span></a>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-get-test-function" title="cogl_depth_state_get_test_function ()">cogl_depth_state_get_test_function</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-write-enabled" title="cogl_depth_state_set_write_enabled ()">cogl_depth_state_set_write_enabled</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="returnvalue">CoglBool</span></a>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-get-write-enabled" title="cogl_depth_state_get_write_enabled ()">cogl_depth_state_get_write_enabled</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-range" title="cogl_depth_state_set_range ()">cogl_depth_state_set_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-get-range" title="cogl_depth_state_get_range ()">cogl_depth_state_get_range</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Depth-State.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState">CoglDepthState</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction">CoglDepthTestFunction</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Depth-State.description"></a><h2>Description</h2>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Depth-State.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="cogl-depth-state-init"></a><h3>cogl_depth_state_init ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_init (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>);</pre>
<p>Initializes the members of <em class="parameter"><code>state</code></em>
to their default values.</p>
<p>You should never pass an un initialized <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> structure
to <a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.2.6"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-set-test-enabled"></a><h3>cogl_depth_state_set_test_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_set_test_enabled (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="type">CoglBool</span></a> enable</code></em>);</pre>
<p>Enables or disables depth testing according to the value of
<em class="parameter"><code>enable</code></em>
.</p>
<p>If depth testing is enable then the <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="type">CoglDepthTestFunction</span></a> set
using <a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-function" title="cogl_depth_state_set_test_function ()"><code class="function">cogl_depth_state_set_test_function()</code></a> us used to evaluate
the depth value of incoming fragments against the corresponding
value stored in the current depth buffer, and if the test passes
then the fragments depth value is used to update the depth buffer.
(unless you have disabled depth writing via
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-write-enabled" title="cogl_depth_state_set_write_enabled ()"><code class="function">cogl_depth_state_set_write_enabled()</code></a>)</p>
<p>By default depth testing is disabled.</p>
<p>NB: this won't directly affect the state of the GPU. You have
to then set the state on a <a class="link" href="cogl-2.0-experimental-Pipeline.html#CoglPipeline" title="CoglPipeline"><span class="type">CoglPipeline</span></a> using
<a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a></p>
<div class="refsect3">
<a name="id-1.2.5.4.6.3.8"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enable</p></td>
<td class="parameter_description"><p>The enable state you want</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-get-test-enabled"></a><h3>cogl_depth_state_get_test_enabled ()</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_depth_state_get_test_enabled (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>);</pre>
<p>Gets the current depth test enabled state as previously set by
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-enabled" title="cogl_depth_state_set_test_enabled ()"><code class="function">cogl_depth_state_set_test_enabled()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.4.6.4.6"></a><h4>Returns</h4>
<p> The pipeline's current depth test enabled state.</p>
<p></p>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-set-test-function"></a><h3>cogl_depth_state_set_test_function ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_set_test_function (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="type">CoglDepthTestFunction</span></a> function</code></em>);</pre>
<p>Sets the <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="type">CoglDepthTestFunction</span></a> used to compare the depth value of
an incoming fragment against the corresponding value in the current
depth buffer.</p>
<p>By default the depth test function is <a class="link" href="cogl-2.0-experimental-Depth-State.html#COGL-DEPTH-TEST-FUNCTION-LESS:CAPS"><code class="literal">COGL_DEPTH_TEST_FUNCTION_LESS</code></a></p>
<p>NB: this won't directly affect the state of the GPU. You have
to then set the state on a <a class="link" href="cogl-2.0-experimental-Pipeline.html#CoglPipeline" title="CoglPipeline"><span class="type">CoglPipeline</span></a> using
<a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a></p>
<div class="refsect3">
<a name="id-1.2.5.4.6.5.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>function</p></td>
<td class="parameter_description"><p>The <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="type">CoglDepthTestFunction</span></a> to set</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-get-test-function"></a><h3>cogl_depth_state_get_test_function ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthTestFunction" title="enum CoglDepthTestFunction"><span class="returnvalue">CoglDepthTestFunction</span></a>
cogl_depth_state_get_test_function (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>);</pre>
<p>Gets the current depth test enable state as previously set via
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-enabled" title="cogl_depth_state_set_test_enabled ()"><code class="function">cogl_depth_state_set_test_enabled()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.4.6.6.6"></a><h4>Returns</h4>
<p> The current depth test enable state.</p>
<p></p>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-set-write-enabled"></a><h3>cogl_depth_state_set_write_enabled ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_set_write_enabled (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>,
<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglBool" title="CoglBool"><span class="type">CoglBool</span></a> enable</code></em>);</pre>
<p>Enables or disables depth buffer writing according to the value of
<em class="parameter"><code>enable</code></em>
. Normally when depth testing is enabled and the comparison
between a fragment's depth value and the corresponding depth buffer
value passes then the fragment's depth is written to the depth
buffer unless writing is disabled here.</p>
<p>By default depth writing is enabled</p>
<p>NB: this won't directly affect the state of the GPU. You have
to then set the state on a <a class="link" href="cogl-2.0-experimental-Pipeline.html#CoglPipeline" title="CoglPipeline"><span class="type">CoglPipeline</span></a> using
<a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a></p>
<div class="refsect3">
<a name="id-1.2.5.4.6.7.7"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>enable</p></td>
<td class="parameter_description"><p>The enable state you want</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-get-write-enabled"></a><h3>cogl_depth_state_get_write_enabled ()</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_depth_state_get_write_enabled (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>);</pre>
<p>Gets the depth writing enable state as set by the corresponding
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-write-enabled" title="cogl_depth_state_set_write_enabled ()"><code class="function">cogl_depth_state_set_write_enabled()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> struct</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.5.4.6.8.6"></a><h4>Returns</h4>
<p> The current depth writing enable state</p>
<p></p>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-set-range"></a><h3>cogl_depth_state_set_range ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_set_range (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>,
<em class="parameter"><code><span class="type">float</span> near_val</code></em>,
<em class="parameter"><code><span class="type">float</span> far_val</code></em>);</pre>
<p>Sets the range to map depth values in normalized device coordinates
to before writing out to a depth buffer.</p>
<p>After your geometry has be transformed, clipped and had perspective
division applied placing it in normalized device
coordinates all depth values between the near and far z clipping
planes are in the range -1 to 1. Before writing any depth value to
the depth buffer though the value is mapped into the range [0, 1].</p>
<p>With this function you can change the range which depth values are
mapped too although the range must still lye within the range [0,
1].</p>
<p>If your driver does not support this feature (for example you are
using GLES 1 drivers) then if you don't use the default range
values you will get an error reported when calling
<a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a>. You can check ahead of time for
the <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#COGL-FEATURE-ID-DEPTH-RANGE:CAPS"><code class="literal">COGL_FEATURE_ID_DEPTH_RANGE</code></a> feature with
<a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#cogl-has-feature" title="cogl_has_feature ()"><code class="function">cogl_has_feature()</code></a> to know if this function will succeed.</p>
<p>By default normalized device coordinate depth values are mapped to
the full range of depth buffer values, [0, 1].</p>
<p>NB: this won't directly affect the state of the GPU. You have
to then set the state on a <a class="link" href="cogl-2.0-experimental-Pipeline.html#CoglPipeline" title="CoglPipeline"><span class="type">CoglPipeline</span></a> using
<a class="link" href="cogl-2.0-experimental-Pipeline.html#cogl-pipeline-set-depth-state" title="cogl_pipeline_set_depth_state ()"><code class="function">cogl_pipeline_set_depth_state()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.9.10"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>near_val</p></td>
<td class="parameter_description"><p>The near component of the desired depth range which will be
clamped to the range [0, 1]</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>far_val</p></td>
<td class="parameter_description"><p>The far component of the desired depth range which will be
clamped to the range [0, 1]</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-depth-state-get-range"></a><h3>cogl_depth_state_get_range ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
cogl_depth_state_get_range (<em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> *state</code></em>,
<em class="parameter"><code><span class="type">float</span> *near_val</code></em>,
<em class="parameter"><code><span class="type">float</span> *far_val</code></em>);</pre>
<p>Gets the current range to which normalized depth values are mapped
before writing to the depth buffer. This corresponds to the range
set with <a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-range" title="cogl_depth_state_set_range ()"><code class="function">cogl_depth_state_set_range()</code></a>.</p>
<div class="refsect3">
<a name="id-1.2.5.4.6.10.5"></a><h4>Parameters</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>state</p></td>
<td class="parameter_description"><p>A <a class="link" href="cogl-2.0-experimental-Depth-State.html#CoglDepthState" title="CoglDepthState"><span class="type">CoglDepthState</span></a> object</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>near_val</p></td>
<td class="parameter_description"><p>A pointer to store the near component of the depth range</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>far_val</p></td>
<td class="parameter_description"><p>A pointer to store the far component of the depth range</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since 2.0</p>
<p class="stability">Stability Level: <acronym title="Unstable interfaces are experimental or transitional. They are typically used to
give outside developers early access to new or rapidly changing technology, or
to provide an interim solution to a problem where a more general solution is
anticipated. No claims are made about either source or binary compatibility from
one minor release to the next.
The Unstable interface level is a warning that these interfaces are subject to
change without warning and should not be used in unbundled products.
Given such caveats, customer impact need not be a factor when considering
incompatible changes to an Unstable interface in a major or minor release.
Nonetheless, when such changes are introduced, the changes should still be
mentioned in the release notes for the affected release.
"><span class="acronym">Unstable</span></acronym></p>
</div>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Depth-State.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="CoglDepthState"></a><h3>CoglDepthState</h3>
<pre class="programlisting">typedef struct {
} CoglDepthState;
</pre>
<p class="since">Since 2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="CoglDepthTestFunction"></a><h3>enum CoglDepthTestFunction</h3>
<p>When using depth testing one of these functions is used to compare
the depth of an incoming fragment against the depth value currently
stored in the depth buffer. The function is changed using
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-function" title="cogl_depth_state_set_test_function ()"><code class="function">cogl_depth_state_set_test_function()</code></a>.</p>
<p>The test is only done when depth testing is explicitly enabled. (See
<a class="link" href="cogl-2.0-experimental-Depth-State.html#cogl-depth-state-set-test-enabled" title="cogl_depth_state_set_test_enabled ()"><code class="function">cogl_depth_state_set_test_enabled()</code></a>)</p>
<div class="refsect3">
<a name="id-1.2.5.4.7.3.5"></a><h4>Members</h4>
<div class="informaltable"><table width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-NEVER:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_NEVER</p></td>
<td class="enum_member_description">
<p>Never passes.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-LESS:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_LESS</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value is less than the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-EQUAL:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_EQUAL</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value is equal to the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-LEQUAL:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_LEQUAL</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value is less or equal to the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-GREATER:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_GREATER</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value is greater than the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-NOTEQUAL:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_NOTEQUAL</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value is not equal to the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-GEQUAL:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_GEQUAL</p></td>
<td class="enum_member_description">
<p>Passes if the fragment's depth
value greater than or equal to the value currently in the depth buffer.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="COGL-DEPTH-TEST-FUNCTION-ALWAYS:CAPS"></a>COGL_DEPTH_TEST_FUNCTION_ALWAYS</p></td>
<td class="enum_member_description">
<p>Always passes.</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
</div>
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