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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Textures</title>
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<th width="100%" align="center">COGL 0.8.0
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<tr><td colspan="5" class="shortcuts"><nobr><a href="#cogl-Textures.synopsis" class="shortcut">Top</a>
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<a href="#cogl-Textures.description" class="shortcut">Description</a></nobr></td></tr>
</table>
<div class="refentry" lang="en">
<a name="cogl-Textures"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="cogl-Textures.top_of_page"></a>Textures</span></h2>
<p>Textures — Fuctions for creating and manipulating textures</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="cogl-Textures.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
<a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex">CoglTextureVertex</a>;
<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> <a class="link" href="cogl-Textures.html#cogl-texture-new-with-size" title="cogl_texture_new_with_size ()">cogl_texture_new_with_size</a> (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format);
<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> <a class="link" href="cogl-Textures.html#cogl-texture-new-from-file" title="cogl_texture_new_from_file ()">cogl_texture_new_from_file</a> (const gchar *filename,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format,
GError **error);
<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> <a class="link" href="cogl-Textures.html#cogl-texture-new-from-data" title="cogl_texture_new_from_data ()">cogl_texture_new_from_data</a> (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format,
guint rowstride,
const guchar *data);
<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> <a class="link" href="cogl-Textures.html#cogl-texture-new-from-foreign" title="cogl_texture_new_from_foreign ()">cogl_texture_new_from_foreign</a> (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format);
gboolean <a class="link" href="cogl-Textures.html#cogl-is-texture" title="cogl_is_texture ()">cogl_is_texture</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
guint <a class="link" href="cogl-Textures.html#cogl-texture-get-width" title="cogl_texture_get_width ()">cogl_texture_get_width</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
guint <a class="link" href="cogl-Textures.html#cogl-texture-get-height" title="cogl_texture_get_height ()">cogl_texture_get_height</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> <a class="link" href="cogl-Textures.html#cogl-texture-get-format" title="cogl_texture_get_format ()">cogl_texture_get_format</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
guint <a class="link" href="cogl-Textures.html#cogl-texture-get-rowstride" title="cogl_texture_get_rowstride ()">cogl_texture_get_rowstride</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
gint <a class="link" href="cogl-Textures.html#cogl-texture-get-max-waste" title="cogl_texture_get_max_waste ()">cogl_texture_get_max_waste</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
COGLenum <a class="link" href="cogl-Textures.html#cogl-texture-get-min-filter" title="cogl_texture_get_min_filter ()">cogl_texture_get_min_filter</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
COGLenum <a class="link" href="cogl-Textures.html#cogl-texture-get-mag-filter" title="cogl_texture_get_mag_filter ()">cogl_texture_get_mag_filter</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
gboolean <a class="link" href="cogl-Textures.html#cogl-texture-is-sliced" title="cogl_texture_is_sliced ()">cogl_texture_is_sliced</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
gboolean <a class="link" href="cogl-Textures.html#cogl-texture-get-gl-texture" title="cogl_texture_get_gl_texture ()">cogl_texture_get_gl_texture</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
GLuint *out_gl_handle,
GLenum *out_gl_target);
gint <a class="link" href="cogl-Textures.html#cogl-texture-get-data" title="cogl_texture_get_data ()">cogl_texture_get_data</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
guint rowstride,
guchar *data);
void <a class="link" href="cogl-Textures.html#cogl-texture-set-filters" title="cogl_texture_set_filters ()">cogl_texture_set_filters</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
COGLenum min_filter,
COGLenum mag_filter);
gboolean <a class="link" href="cogl-Textures.html#cogl-texture-set-region" title="cogl_texture_set_region ()">cogl_texture_set_region</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
guint dst_width,
guint dst_height,
gint width,
gint height,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
guint rowstride,
const guchar *data);
<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> <a class="link" href="cogl-Textures.html#cogl-texture-ref" title="cogl_texture_ref ()">cogl_texture_ref</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
void <a class="link" href="cogl-Textures.html#cogl-texture-unref" title="cogl_texture_unref ()">cogl_texture_unref</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);
void <a class="link" href="cogl-Textures.html#cogl-texture-rectangle" title="cogl_texture_rectangle ()">cogl_texture_rectangle</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> x1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> y1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> x2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> y2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> tx1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> ty1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> tx2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> ty2);
void <a class="link" href="cogl-Textures.html#cogl-texture-polygon" title="cogl_texture_polygon ()">cogl_texture_polygon</a> (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
guint n_vertices,
<a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex">CoglTextureVertex</a> *vertices,
gboolean use_color);
</pre>
</div>
<div class="refsect1" lang="en">
<a name="cogl-Textures.description"></a><h2>Description</h2>
<p>
COGL allows creating and manipulating GL textures using a uniform
API that tries to hide all the various complexities of creating,
loading and manipulating textures.</p>
<p>
</p>
</div>
<div class="refsect1" lang="en">
<a name="cogl-Textures.details"></a><h2>Details</h2>
<div class="refsect2" lang="en">
<a name="CoglTextureVertex"></a><h3>CoglTextureVertex</h3>
<pre class="programlisting">typedef struct {
ClutterFixed x, y, z;
ClutterFixed tx, ty;
ClutterColor color;
} CoglTextureVertex;
</pre>
<p>
Used to specify vertex information when calling <a class="link" href="cogl-Textures.html#cogl-texture-polygon" title="cogl_texture_polygon ()"><code class="function">cogl_texture_polygon()</code></a>.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> <em class="structfield"><code>x</code></em>;</span></p></td>
<td> Model x-coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> <em class="structfield"><code>y</code></em>;</span></p></td>
<td> Model y-coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> <em class="structfield"><code>z</code></em>;</span></p></td>
<td> Model z-coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> <em class="structfield"><code>tx</code></em>;</span></p></td>
<td> Texture x-coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> <em class="structfield"><code>ty</code></em>;</span></p></td>
<td> Texture y-coordinate
</td>
</tr>
<tr>
<td><p><span class="term"><a
href="../clutter/clutter-Colors.html#ClutterColor"
>ClutterColor</a> <em class="structfield"><code>color</code></em>;</span></p></td>
<td> The color to use at this vertex. This is ignored if
<em class="parameter"><code>use_color</code></em> is <code class="literal">FALSE</code> when calling <a class="link" href="cogl-Textures.html#cogl-texture-polygon" title="cogl_texture_polygon ()"><code class="function">cogl_texture_polygon()</code></a>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-new-with-size"></a><h3>cogl_texture_new_with_size ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> cogl_texture_new_with_size (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format);</pre>
<p>
Create a new texture with specified dimensions and pixel format.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<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>max_waste</code></em> :</span></p></td>
<td> maximum extra horizontal and|or vertical margin pixels to make
texture fit GPU limitations.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>auto_mipmap</code></em> :</span></p></td>
<td> enable or disable automatic generation of mipmap pyramid
from the base level image whenever it is updated.
</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-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to use for the GPU storage of the
texture.
</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-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to the newly created texture or COGL_INVALID_HANDLE
if texture creation failed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-new-from-file"></a><h3>cogl_texture_new_from_file ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> cogl_texture_new_from_file (const gchar *filename,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format,
GError **error);</pre>
<p>
Load an image file from disk.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<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> maximum extra horizontal and|or vertical margin pixels to make
texture fit GPU limitations.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>auto_mipmap</code></em> :</span></p></td>
<td> enable or disable automatic generation of mipmap pyramid
from the base level image whenever it is updated.
</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-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to use for the GPU storage 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> or NULL.
</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-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to the newly created texture or COGL_INVALID_HANDLE
if creating the texture failed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-new-from-data"></a><h3>cogl_texture_new_from_data ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> cogl_texture_new_from_data (guint width,
guint height,
gint max_waste,
gboolean auto_mipmap,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> internal_format,
guint rowstride,
const guchar *data);</pre>
<p>
Create a new cogl texture based on data residing in memory.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<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>max_waste</code></em> :</span></p></td>
<td> maximum extra horizontal and|or vertical margin pixels to make
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>auto_mipmap</code></em> :</span></p></td>
<td> enable or disable automatic generation of mipmap pyramid
from the base level image whenever it is updated.
</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-General-API.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-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> that will be used for storing the
buffer on the GPU.
</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>.
</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"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> a <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to the newly created texture or COGL_INVALID_HANDLE
if creating the texture failed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-new-from-foreign"></a><h3>cogl_texture_new_from_foreign ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format);</pre>
<p>
Create a cogl texture based on an existing OpenGL texture, the width, height
and format are passed along since it is not possible to query this from a
handle with GLES 1.0.</p>
<p>
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>gl_handle</code></em> :</span></p></td>
<td> opengl target type of foreign texture
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>gl_target</code></em> :</span></p></td>
<td> opengl handle of foreign texture.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td> width of foreign texture
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td> height of foreign texture.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x_pot_waste</code></em> :</span></p></td>
<td> maximum horizontal waste.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y_pot_waste</code></em> :</span></p></td>
<td> maximum vertical waste.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>format</code></em> :</span></p></td>
<td> format of the foreign texture.
</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-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> to the newly created texture or COGL_INVALID_HANDLE
if creating the texture failed.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-is-texture"></a><h3>cogl_is_texture ()</h3>
<pre class="programlisting">gboolean cogl_is_texture (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Gets whether the given handle references an existing texture object.</p>
<p>
</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 texture,
<code class="literal">FALSE</code> otherwise
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-width"></a><h3>cogl_texture_get_width ()</h3>
<pre class="programlisting">guint cogl_texture_get_width (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the width of a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the width of the GPU side texture in pixels:
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-height"></a><h3>cogl_texture_get_height ()</h3>
<pre class="programlisting">guint cogl_texture_get_height (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the height of a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the height of the GPU side texture in pixels:
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-format"></a><h3>cogl_texture_get_format ()</h3>
<pre class="programlisting"><a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> cogl_texture_get_format (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the <a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> of a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> of the GPU side texture.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-rowstride"></a><h3>cogl_texture_get_rowstride ()</h3>
<pre class="programlisting">guint cogl_texture_get_rowstride (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the rowstride of a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the offset in bytes between each consequetive row of pixels.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-max-waste"></a><h3>cogl_texture_get_max_waste ()</h3>
<pre class="programlisting">gint cogl_texture_get_max_waste (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the maximum wasted (unused) pixels in one dimension of a GPU side
texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the maximum waste.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-min-filter"></a><h3>cogl_texture_get_min_filter ()</h3>
<pre class="programlisting">COGLenum cogl_texture_get_min_filter (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the currently set downscaling filter for a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current downscaling filter for a cogl texture.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-mag-filter"></a><h3>cogl_texture_get_mag_filter ()</h3>
<pre class="programlisting">COGLenum cogl_texture_get_mag_filter (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query the currently set downscaling filter for a cogl texture.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the current downscaling filter for a cogl texture.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-is-sliced"></a><h3>cogl_texture_is_sliced ()</h3>
<pre class="programlisting">gboolean cogl_texture_is_sliced (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Query if a texture is sliced (stored as multiple GPU side tecture
objects).</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</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 texture is sliced, <code class="literal">FALSE</code> if the texture
is stored as a single GPU texture.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-gl-texture"></a><h3>cogl_texture_get_gl_texture ()</h3>
<pre class="programlisting">gboolean cogl_texture_get_gl_texture (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
GLuint *out_gl_handle,
GLenum *out_gl_target);</pre>
<p>
Query the GL handles for a GPU side texture through it's <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a>,
if the texture is spliced the data for the first sub texture will be
queried.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_gl_handle</code></em> :</span></p></td>
<td> pointer to return location for the textures GL handle, or
NULL.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>out_gl_target</code></em> :</span></p></td>
<td> pointer to return location for the GL target type, or NULL.
</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 was successfully retrieved <code class="literal">FALSE</code>
if the handle was invalid.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-get-data"></a><h3>cogl_texture_get_data ()</h3>
<pre class="programlisting">gint cogl_texture_get_data (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
guint rowstride,
guchar *data);</pre>
<p>
Copy the pixel data from a cogl texture to system memory.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a> for a texture.
</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-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> to store the texture as.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td> the rowstride of <em class="parameter"><code>data</code></em> or retrieved from texture if none is
specified.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td> memory location to write contents of buffer, or <code class="literal">NULL</code> if we're
only querying the data size through the return value.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the size of the texture data in bytes (or 0 if the texture
is not valid.)
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-set-filters"></a><h3>cogl_texture_set_filters ()</h3>
<pre class="programlisting">void cogl_texture_set_filters (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
COGLenum min_filter,
COGLenum mag_filter);</pre>
<p>
Changes the decimation and interpolation filters used when the texture is
drawn at other scales than 100%.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a>.
</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 the 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 the texture.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-set-region"></a><h3>cogl_texture_set_region ()</h3>
<pre class="programlisting">gboolean cogl_texture_set_region (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
gint src_x,
gint src_y,
gint dst_x,
gint dst_y,
guint dst_width,
guint dst_height,
gint width,
gint height,
<a class="link" href="cogl-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat">CoglPixelFormat</a> format,
guint rowstride,
const guchar *data);</pre>
<p>
Sets the pixels in a rectangular subregion of <em class="parameter"><code>handle</code></em> from an in-memory
buffer containing pixel data.</p>
<p>
</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 <a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle"><span class="type">CoglHandle</span></a>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_x</code></em> :</span></p></td>
<td> upper left coordinate to use from source data.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>src_y</code></em> :</span></p></td>
<td> upper left coordinate to use from source data.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dst_x</code></em> :</span></p></td>
<td> upper left destination horizontal coordinate.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dst_y</code></em> :</span></p></td>
<td> upper left destination vertical coordinate.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dst_width</code></em> :</span></p></td>
<td> width of destination region to write.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>dst_height</code></em> :</span></p></td>
<td> height of destination region to write.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>width</code></em> :</span></p></td>
<td> width of source data buffer.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td> height of source data buffer.
</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-General-API.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> used in the source buffer.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>rowstride</code></em> :</span></p></td>
<td> rowstride of source buffer (computed from width if none
specified)
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>data</code></em> :</span></p></td>
<td> the actual pixel data.
</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 subregion upload was successful, otherwise <code class="literal">FALSE</code>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-ref"></a><h3>cogl_texture_ref ()</h3>
<pre class="programlisting"><a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> cogl_texture_ref (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Increment the reference count for a cogl texture.</p>
<p>
</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 <em class="parameter"><code>CoglHandle</code></em>.
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td> the <em class="parameter"><code>handle</code></em>.
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-unref"></a><h3>cogl_texture_unref ()</h3>
<pre class="programlisting">void cogl_texture_unref (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle);</pre>
<p>
Deccrement the reference count for a cogl texture.</p>
<p>
</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 <em class="parameter"><code>CoglHandle</code></em>.
</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-rectangle"></a><h3>cogl_texture_rectangle ()</h3>
<pre class="programlisting">void cogl_texture_rectangle (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> x1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> y1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> x2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> y2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> tx1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> ty1,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> tx2,
<a
href="../clutter/clutter-Fixed-Point-Support.html#ClutterFixed"
>ClutterFixed</a> ty2);</pre>
<p>
Draw a rectangle from a texture to the display, to draw the entire
texture pass in <em class="parameter"><code>tx1</code></em>=0.0 <em class="parameter"><code>ty1</code></em>=0.0 <em class="parameter"><code>tx2</code></em>=1.0 <em class="parameter"><code>ty2</code></em>=1.0.</p>
<p>
</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 <em class="parameter"><code>CoglHandle</code></em>.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x1</code></em> :</span></p></td>
<td> x coordinate upper left on screen.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y1</code></em> :</span></p></td>
<td> y coordinate upper left on screen.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>x2</code></em> :</span></p></td>
<td> x coordinate lower right on screen.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>y2</code></em> :</span></p></td>
<td> y coordinate lower right on screen.
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tx1</code></em> :</span></p></td>
<td> x part of texture coordinate to use for upper left pixel
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ty1</code></em> :</span></p></td>
<td> y part of texture coordinate to use for upper left pixel
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>tx2</code></em> :</span></p></td>
<td> x part of texture coordinate to use for lower right pixel
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>ty2</code></em> :</span></p></td>
<td> y part of texture coordinate to use for left pixel
</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<a name="cogl-texture-polygon"></a><h3>cogl_texture_polygon ()</h3>
<pre class="programlisting">void cogl_texture_polygon (<a class="link" href="cogl-Utility-API.html#CoglHandle" title="CoglHandle">CoglHandle</a> handle,
guint n_vertices,
<a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex">CoglTextureVertex</a> *vertices,
gboolean use_color);</pre>
<p>
Draws a polygon from a texture with the given model and texture
coordinates. This can be used to draw arbitrary shapes textured
with a COGL texture. If <em class="parameter"><code>use_color</code></em> is <code class="literal">TRUE</code> then the current COGL
color will be changed for each vertex using the value specified in
the color member of <a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex"><span class="type">CoglTextureVertex</span></a>. This can be used for
example to make the texture fade out by setting the alpha value of
the color.
</p>
<p>
All of the texture coordinates must be in the range [0,1] and
repeating the texture is not supported.
</p>
<p>
Because of the way this function is implemented it will currently
only work if either the texture is not sliced or the backend is not
OpenGL ES and the minifying and magnifying functions are both set
to CGL_NEAREST.</p>
<p>
</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 for a texture
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>n_vertices</code></em> :</span></p></td>
<td> The length of the vertices array
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>vertices</code></em> :</span></p></td>
<td> An array of <a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex"><span class="type">CoglTextureVertex</span></a> structs
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>use_color</code></em> :</span></p></td>
<td> <code class="literal">TRUE</code> if the color member of <a class="link" href="cogl-Textures.html#CoglTextureVertex" title="CoglTextureVertex"><span class="type">CoglTextureVertex</span></a> should be used
</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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