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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>2D textures</title>
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<a href="#cogl-2.0-experimental-2D-textures.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#cogl-2.0-experimental-2D-textures.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="cogl-2.0-experimental-2D-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-2D-textures.top_of_page"></a>2D textures</span></h2>
<p>2D textures — Functions for creating and manipulating 2D textures</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-2D-textures.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D">CoglTexture2D</a>;
#define             <a class="link" href="cogl-2.0-experimental-2D-textures.html#cogl-texture-2d-new-with-size" title="cogl_texture_2d_new_with_size">cogl_texture_2d_new_with_size</a>
#define             <a class="link" href="cogl-2.0-experimental-2D-textures.html#cogl-texture-2d-new-from-data" title="cogl_texture_2d_new_from_data">cogl_texture_2d_new_from_data</a>
#define             <a class="link" href="cogl-2.0-experimental-2D-textures.html#cogl-texture-2d-new-from-foreign" title="cogl_texture_2d_new_from_foreign">cogl_texture_2d_new_from_foreign</a>
#define             <a class="link" href="cogl-2.0-experimental-2D-textures.html#cogl-is-texture-rectangle" title="cogl_is_texture_rectangle">cogl_is_texture_rectangle</a>
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-2D-textures.description"></a><h2>Description</h2>
<p>
These functions allow low-level 2D textures to be allocated. These
differ from sliced textures for example which may internally be
made up of multiple 2D textures, or atlas textures where Cogl must
internally modify user texture coordinates before they can be used
by the GPU.
</p>
<p>
You should be aware that many GPUs only support power of two sizes
for <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures. You can check support for non power of
two textures by checking for the <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#COGL-FEATURE-ID-TEXTURE-NPOT:CAPS"><code class="literal">COGL_FEATURE_ID_TEXTURE_NPOT</code></a> feature
via <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>.
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-2D-textures.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglTexture2D"></a><h3>CoglTexture2D</h3>
<pre class="programlisting">typedef struct _CoglTexture2D CoglTexture2D;</pre>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-new-with-size"></a><h3>cogl_texture_2d_new_with_size</h3>
<pre class="programlisting">#define cogl_texture_2d_new_with_size cogl_texture_2d_new_with_size_EXP
</pre>
<p>
Allocates a low-level <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> texture that your GPU can
texture from directly. This is unlike sliced textures for example
which may be comprised of multiple internal textures, or atlas
textures where Cogl has to modify texture coordinates before they
may be used by the GPU.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>Many GPUs only support power of two sizes for <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>
textures. You can check support for non power of two textures by
checking for the <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#COGL-FEATURE-ID-TEXTURE-NPOT:CAPS"><code class="literal">COGL_FEATURE_ID_TEXTURE_NPOT</code></a> feature via
<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>.</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>ctx</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Width of the texture to allocate</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Height of the texture to allocate</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"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <span class="type">GError</span> for exceptions</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>, or if the size is not
supported (because it is too large or a non-power-of-two
size that the hardware doesn't support) it will return
<code class="literal">NULL</code> and set <em class="parameter"><code>error</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-new-from-data"></a><h3>cogl_texture_2d_new_from_data</h3>
<pre class="programlisting">#define cogl_texture_2d_new_from_data cogl_texture_2d_new_from_data_EXP
</pre>
<p>
Creates a new <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> texture based on data residing in memory.
These are unlike sliced textures for example which may be comprised
of multiple internal textures, or atlas textures where Cogl has to
modify texture coordinates before they may be used by the GPU.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>Many GPUs only support power of two sizes for <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>
textures. You can check support for non power of two textures by
checking for the <a class="link" href="cogl-2.0-experimental-The-Top-Level-Context.html#COGL-FEATURE-ID-TEXTURE-NPOT:CAPS"><code class="literal">COGL_FEATURE_ID_TEXTURE_NPOT</code></a> feature via
<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>.</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>ctx</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</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>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> that will be used for storing
the buffer on the GPU. If COGL_PIXEL_FORMAT_ANY 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 starts of
scanlines 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 <span class="type">GError</span> for exceptions</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>, or if the size is not
supported (because it is too large or a non-power-of-two
size that the hardware doesn't support) it will return
<code class="literal">NULL</code> and set <em class="parameter"><code>error</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-new-from-foreign"></a><h3>cogl_texture_2d_new_from_foreign</h3>
<pre class="programlisting">#define cogl_texture_2d_new_from_foreign cogl_texture_2d_new_from_foreign_EXP
</pre>
<p>
Wraps an existing GL_TEXTURE_2D texture object as a <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>.
This can be used for integrating Cogl with software using OpenGL
directly.
</p>
<p>
</p>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">Note</h3>The results are undefined for passing an invalid <em class="parameter"><code>gl_handle</code></em>
or if <em class="parameter"><code>width</code></em> or <em class="parameter"><code>height</code></em> don't have the correct texture
geometry.</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>ctx</code></em> :</span></p></td>
<td>A <span class="type">CoglContext</span>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gl_handle</code></em> :</span></p></td>
<td>A GL handle for a GL_TEXTURE_2D texture object</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td>Width of the foreign GL texture</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>Height of the foreign GL texture</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"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>A <span class="type">GError</span> for exceptions</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>A newly allocated <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a>, or if Cogl could not
validate the <em class="parameter"><code>gl_handle</code></em> in some way (perhaps because of
an unsupported format) it will return <code class="literal">NULL</code> and set
<em class="parameter"><code>error</code></em>.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 2.0</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-texture-rectangle"></a><h3>cogl_is_texture_rectangle</h3>
<pre class="programlisting">#define cogl_is_texture_rectangle cogl_is_texture_rectangle_EXP
</pre>
<p>
Gets whether the given object references an existing
<a class="link" href="cogl-2.0-experimental-Rectangle-textures-(non-normalized-coordinates).html#CoglTextureRectangle" title="CoglTextureRectangle"><span class="type">CoglTextureRectangle</span></a> object.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<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>
</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-Rectangle-textures-(non-normalized-coordinates).html#CoglTextureRectangle" title="CoglTextureRectangle"><span class="type">CoglTextureRectangle</span></a>, <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
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