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<a href="#libg3d-texture.description" class="shortcut">Description</a></span>
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<a name="libg3d-texture"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="libg3d-texture.top_of_page"></a>texture</span></h2>
<p>texture — Texture loading and manipulation</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="libg3d-texture.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name"><a class="link" href="libg3d-texture.html#G3D-FLAG-IMG-GREYSCALE:CAPS" title="G3D_FLAG_IMG_GREYSCALE">G3D_FLAG_IMG_GREYSCALE</a></td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-load-cached" title="g3d_texture_load_cached ()">g3d_texture_load_cached</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-load-from-stream" title="g3d_texture_load_from_stream ()">g3d_texture_load_from_stream</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-load" title="g3d_texture_load ()">g3d_texture_load</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="libg3d-texture.html#g3d-texture-free" title="g3d_texture_free ()">g3d_texture_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-prepare" title="g3d_texture_prepare ()">g3d_texture_prepare</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">gboolean</span>
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-flip-y" title="g3d_texture_flip_y ()">g3d_texture_flip_y</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
</td>
<td class="function_name">
<a class="link" href="libg3d-texture.html#g3d-texture-merge-alpha" title="g3d_texture_merge_alpha ()">g3d_texture_merge_alpha</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libg3d-texture.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="libg3d-texture.html#G3DTexEnv" title="enum G3DTexEnv">G3DTexEnv</a></td>
</tr>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage">G3DImage</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="libg3d-texture.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include <g3d/texture.h>
</pre>
</div>
<div class="refsect1">
<a name="libg3d-texture.description"></a><h2>Description</h2>
<p>A texture is an image used in materials. Here are some helper functions,
mostly for cached loading of a <a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a>.</p>
</div>
<div class="refsect1">
<a name="libg3d-texture.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="G3D-FLAG-IMG-GREYSCALE:CAPS"></a><h3>G3D_FLAG_IMG_GREYSCALE</h3>
<pre class="programlisting">#define G3D_FLAG_IMG_GREYSCALE (1L << 1)
</pre>
<p>The image just uses the red channel for grey value</p>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-load-cached"></a><h3>g3d_texture_load_cached ()</h3>
<pre class="programlisting"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
g3d_texture_load_cached (<em class="parameter"><code><a class="link" href="libg3d-context.html#G3DContext" title="G3DContext"><span class="type">G3DContext</span></a> *context</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-model.html#G3DModel" title="G3DModel"><span class="type">G3DModel</span></a> *model</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);</pre>
<p>Loads a texture image from file and attaches it to a hash table in the
model. On a second try to load this texture it is returned from cache.</p>
<div class="refsect3">
<a name="id-1.2.8.7.3.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>context</p></td>
<td class="parameter_description"><p>a valid context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>model</p></td>
<td class="parameter_description"><p>a valid model</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>the file name of the texture to load</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.3.6"></a><h4>Returns</h4>
<p> the texture image</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-load-from-stream"></a><h3>g3d_texture_load_from_stream ()</h3>
<pre class="programlisting"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
g3d_texture_load_from_stream (<em class="parameter"><code><a class="link" href="libg3d-context.html#G3DContext" title="G3DContext"><span class="type">G3DContext</span></a> *context</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-model.html#G3DModel" title="G3DModel"><span class="type">G3DModel</span></a> *model</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-stream.html#G3DStream" title="G3DStream"><span class="type">G3DStream</span></a> *stream</code></em>);</pre>
<p>Load a texture image from a stream. The file type is determined by the
extension of the stream URI, so it should be valid. If <em class="parameter"><code>model</code></em>
is not NULL
the texture image is cached (or retrieved from cache if available).</p>
<div class="refsect3">
<a name="id-1.2.8.7.4.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>context</p></td>
<td class="parameter_description"><p>a valid context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>model</p></td>
<td class="parameter_description"><p>a valid model or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>stream</p></td>
<td class="parameter_description"><p>an open stream</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.4.6"></a><h4>Returns</h4>
<p> the texture image or NULL in case of an error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-load"></a><h3>g3d_texture_load ()</h3>
<pre class="programlisting"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
g3d_texture_load (<em class="parameter"><code><a class="link" href="libg3d-context.html#G3DContext" title="G3DContext"><span class="type">G3DContext</span></a> *context</code></em>,
<em class="parameter"><code>const <span class="type">gchar</span> *filename</code></em>);</pre>
<p>Load a texture from a file. The type of file is determined by the file
extension.</p>
<div class="refsect3">
<a name="id-1.2.8.7.5.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>context</p></td>
<td class="parameter_description"><p>a valid context</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>filename</p></td>
<td class="parameter_description"><p>the file name of the texture</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.5.6"></a><h4>Returns</h4>
<p> the texture image or NULL in case of an error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-free"></a><h3>g3d_texture_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
g3d_texture_free (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);</pre>
<p>Frees all memory used by this texture image.</p>
<div class="refsect3">
<a name="id-1.2.8.7.6.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>texture</p></td>
<td class="parameter_description"><p>a texture image</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-prepare"></a><h3>g3d_texture_prepare ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
g3d_texture_prepare (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);</pre>
<p>Resizes the image to dimensions which are a power of 2 to be
usable as an OpenGL texture.
(FIXME: unimplemented)</p>
<div class="refsect3">
<a name="id-1.2.8.7.7.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>texture</p></td>
<td class="parameter_description"><p>a texture image</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.7.6"></a><h4>Returns</h4>
<p> TRUE on success, FALSE else</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-flip-y"></a><h3>g3d_texture_flip_y ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>
g3d_texture_flip_y (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);</pre>
<p>Mirror the image along the x axis - all y coordinates are inverted.</p>
<div class="refsect3">
<a name="id-1.2.8.7.8.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>texture</p></td>
<td class="parameter_description"><p>a texture image</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.8.6"></a><h4>Returns</h4>
<p> TRUE on success, FALSE on error.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="g3d-texture-merge-alpha"></a><h3>g3d_texture_merge_alpha ()</h3>
<pre class="programlisting"><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> *
g3d_texture_merge_alpha (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *image</code></em>,
<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *aimage</code></em>);</pre>
<p>Merges alpha information from <em class="parameter"><code>aimage</code></em>
into output image. If <em class="parameter"><code>image</code></em>
is NULL a
new image is created, else <em class="parameter"><code>image</code></em>
is returned with alpha from <em class="parameter"><code>aimage</code></em>
.</p>
<div class="refsect3">
<a name="id-1.2.8.7.9.5"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" 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>image</p></td>
<td class="parameter_description"><p>a texture image or NULL</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>aimage</p></td>
<td class="parameter_description"><p>an image with alpha information</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="id-1.2.8.7.9.6"></a><h4>Returns</h4>
<p> a texture image or NULL in case of an error.</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="libg3d-texture.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="G3DTexEnv"></a><h3>enum G3DTexEnv</h3>
<p>Specify how the texture should interact with other material properties.</p>
<div class="refsect3">
<a name="id-1.2.8.8.2.4"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" 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="G3D-TEXENV-UNSPECIFIED:CAPS"></a>G3D_TEXENV_UNSPECIFIED</p></td>
<td class="enum_member_description">
<p>unspecified, application decides</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="G3D-TEXENV-BLEND:CAPS"></a>G3D_TEXENV_BLEND</p></td>
<td class="enum_member_description">
<p>use blending</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="G3D-TEXENV-DECAL:CAPS"></a>G3D_TEXENV_DECAL</p></td>
<td class="enum_member_description">
<p>use as decal</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="G3D-TEXENV-MODULATE:CAPS"></a>G3D_TEXENV_MODULATE</p></td>
<td class="enum_member_description">
<p>use modulate</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="G3D-TEXENV-REPLACE:CAPS"></a>G3D_TEXENV_REPLACE</p></td>
<td class="enum_member_description">
<p>replace color</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="G3DImage"></a><h3>G3DImage</h3>
<pre class="programlisting">typedef struct {
gchar *name;
guint32 width;
guint32 height;
guint8 depth;
guint32 flags;
guint8 *pixeldata;
guint32 tex_id;
G3DTexEnv tex_env;
G3DFloat tex_scale_u;
G3DFloat tex_scale_v;
} G3DImage;
</pre>
<p>Object containing a two-dimensional pixel image.</p>
<div class="refsect3">
<a name="id-1.2.8.8.3.5"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="struct_member_name"><p><span class="type">gchar</span> *<em class="structfield"><code><a name="G3DImage.name"></a>name</code></em>;</p></td>
<td class="struct_member_description"><p>name of image</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.width"></a>width</code></em>;</p></td>
<td class="struct_member_description"><p>width of image in pixels</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.height"></a>height</code></em>;</p></td>
<td class="struct_member_description"><p>height of image in pixels</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint8</span> <em class="structfield"><code><a name="G3DImage.depth"></a>depth</code></em>;</p></td>
<td class="struct_member_description"><p>depth of image in bits</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.flags"></a>flags</code></em>;</p></td>
<td class="struct_member_description"><p>flags</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint8</span> *<em class="structfield"><code><a name="G3DImage.pixeldata"></a>pixeldata</code></em>;</p></td>
<td class="struct_member_description"><p>the binary image data</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.tex-id"></a>tex_id</code></em>;</p></td>
<td class="struct_member_description"><p>the OpenGL texture id, should be unique model-wide</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-texture.html#G3DTexEnv" title="enum G3DTexEnv"><span class="type">G3DTexEnv</span></a> <em class="structfield"><code><a name="G3DImage.tex-env"></a>tex_env</code></em>;</p></td>
<td class="struct_member_description"><p>texture environment flags</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat"><span class="type">G3DFloat</span></a> <em class="structfield"><code><a name="G3DImage.tex-scale-u"></a>tex_scale_u</code></em>;</p></td>
<td class="struct_member_description"><p>factor scaling texture width, should be 1.0 for most cases</p></td>
<td class="struct_member_annotations"> </td>
</tr>
<tr>
<td class="struct_member_name"><p><a class="link" href="libg3d-types.html#G3DFloat" title="G3DFloat"><span class="type">G3DFloat</span></a> <em class="structfield"><code><a name="G3DImage.tex-scale-v"></a>tex_scale_v</code></em>;</p></td>
<td class="struct_member_description"><p>factor scaling texture height, should be 1.0 for most cases</p></td>
<td class="struct_member_annotations"> </td>
</tr>
</tbody>
</table></div>
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