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<a href="#libg3d-texture.description" class="shortcut">Description</a>
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<a name="libg3d-texture"></a><div class="titlepage"></div>
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<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 valign="top" align="right"></td>
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<div class="refsynopsisdiv">
<a name="libg3d-texture.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">
#include <g3d/texture.h>
#define <a class="link" href="libg3d-texture.html#G3D-FLAG-IMG-GREYSCALE:CAPS" title="G3D_FLAG_IMG_GREYSCALE">G3D_FLAG_IMG_GREYSCALE</a>
enum <a class="link" href="libg3d-texture.html#G3DTexEnv" title="enum G3DTexEnv">G3DTexEnv</a>;
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage">G3DImage</a>;
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> * <a class="link" href="libg3d-texture.html#g3d-texture-load-cached" title="g3d_texture_load_cached ()">g3d_texture_load_cached</a> (<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>);
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> * <a class="link" href="libg3d-texture.html#g3d-texture-load-from-stream" title="g3d_texture_load_from_stream ()">g3d_texture_load_from_stream</a> (<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>);
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> * <a class="link" href="libg3d-texture.html#g3d-texture-load" title="g3d_texture_load ()">g3d_texture_load</a> (<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>);
<span class="returnvalue">void</span> <a class="link" href="libg3d-texture.html#g3d-texture-free" title="g3d_texture_free ()">g3d_texture_free</a> (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="libg3d-texture.html#g3d-texture-prepare" title="g3d_texture_prepare ()">g3d_texture_prepare</a> (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);
<span class="returnvalue">gboolean</span> <a class="link" href="libg3d-texture.html#g3d-texture-flip-y" title="g3d_texture_flip_y ()">g3d_texture_flip_y</a> (<em class="parameter"><code><a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="type">G3DImage</span></a> *texture</code></em>);
<a class="link" href="libg3d-texture.html#G3DImage" title="G3DImage"><span class="returnvalue">G3DImage</span></a> * <a class="link" href="libg3d-texture.html#g3d-texture-merge-alpha" title="g3d_texture_merge_alpha ()">g3d_texture_merge_alpha</a> (<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>
</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.details"></a><h2>Details</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="G3DTexEnv"></a><h3>enum G3DTexEnv</h3>
<pre class="programlisting">typedef enum {
G3D_TEXENV_UNSPECIFIED = 0,
G3D_TEXENV_BLEND,
G3D_TEXENV_DECAL,
G3D_TEXENV_MODULATE,
G3D_TEXENV_REPLACE
} G3DTexEnv;
</pre>
<p>
Specify how the texture should interact with other material properties.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><a name="G3D-TEXENV-UNSPECIFIED:CAPS"></a><span class="term"><code class="literal">G3D_TEXENV_UNSPECIFIED</code></span></p></td>
<td>unspecified, application decides
</td>
</tr>
<tr>
<td><p><a name="G3D-TEXENV-BLEND:CAPS"></a><span class="term"><code class="literal">G3D_TEXENV_BLEND</code></span></p></td>
<td>use blending
</td>
</tr>
<tr>
<td><p><a name="G3D-TEXENV-DECAL:CAPS"></a><span class="term"><code class="literal">G3D_TEXENV_DECAL</code></span></p></td>
<td>use as decal
</td>
</tr>
<tr>
<td><p><a name="G3D-TEXENV-MODULATE:CAPS"></a><span class="term"><code class="literal">G3D_TEXENV_MODULATE</code></span></p></td>
<td>use modulate
</td>
</tr>
<tr>
<td><p><a name="G3D-TEXENV-REPLACE:CAPS"></a><span class="term"><code class="literal">G3D_TEXENV_REPLACE</code></span></p></td>
<td>replace color
</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><span class="type">gchar</span> *<em class="structfield"><code><a name="G3DImage.name"></a>name</code></em>;</span></p></td>
<td>name of image</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.width"></a>width</code></em>;</span></p></td>
<td>width of image in pixels</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.height"></a>height</code></em>;</span></p></td>
<td>height of image in pixels</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint8</span> <em class="structfield"><code><a name="G3DImage.depth"></a>depth</code></em>;</span></p></td>
<td>depth of image in bits</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.flags"></a>flags</code></em>;</span></p></td>
<td>flags</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint8</span> *<em class="structfield"><code><a name="G3DImage.pixeldata"></a>pixeldata</code></em>;</span></p></td>
<td>the binary image data</td>
</tr>
<tr>
<td><p><span class="term"><span class="type">guint32</span> <em class="structfield"><code><a name="G3DImage.tex-id"></a>tex_id</code></em>;</span></p></td>
<td>the OpenGL texture id, should be unique model-wide</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>texture environment flags</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>factor scaling texture width, should be 1.0 for most cases</td>
</tr>
<tr>
<td><p><span class="term"><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>;</span></p></td>
<td>factor scaling texture height, should be 1.0 for most cases</td>
</tr>
</tbody>
</table></div>
</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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a valid context</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>model</code></em> :</span></p></td>
<td>a valid model</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the file name of the texture to load</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the texture image</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a valid context</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>model</code></em> :</span></p></td>
<td>a valid model or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>stream</code></em> :</span></p></td>
<td>an open stream</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the texture image or NULL in case of an error.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>context</code></em> :</span></p></td>
<td>a valid context</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>filename</code></em> :</span></p></td>
<td>the file name of the texture</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the texture image or NULL in case of an error.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><em class="parameter"><code>texture</code></em> :</span></p></td>
<td>a texture image</td>
</tr></tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>texture</code></em> :</span></p></td>
<td>a texture image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE on success, FALSE else</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>texture</code></em> :</span></p></td>
<td>a texture image</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>TRUE on success, FALSE on error.</td>
</tr>
</tbody>
</table></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="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>image</code></em> :</span></p></td>
<td>a texture image or NULL</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>aimage</code></em> :</span></p></td>
<td>an image with alpha information</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a texture image or NULL in case of an error.</td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
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