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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<a href="#cogl-2.0-experimental-Sliced-Textures.synopsis" class="shortcut">Top</a>
                   | 
                  <a href="#cogl-2.0-experimental-Sliced-Textures.description" class="shortcut">Description</a>
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<div class="refentry">
<a name="cogl-2.0-experimental-Sliced-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-Sliced-Textures.top_of_page"></a>Sliced Textures</span></h2>
<p>Sliced Textures — Functions for creating and manipulating 2D meta
                    textures that may internally be comprised of
                    multiple 2D textures with power-of-two sizes.</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="cogl-2.0-experimental-Sliced-Textures.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis">                    <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced">CoglTexture2DSliced</a>;
<a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-texture-2d-sliced-new-with-size" title="cogl_texture_2d_sliced_new_with_size ()">cogl_texture_2d_sliced_new_with_size</a>
                                                        (<em class="parameter"><code><span class="type">CoglContext</span> *ctx</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> width</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> height</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
                                                         <em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<span class="returnvalue">gboolean</span>            <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#cogl-is-texture-2d-sliced" title="cogl_is_texture_2d_sliced ()">cogl_is_texture_2d_sliced</a>           (<em class="parameter"><code><span class="type">void</span> *object</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sliced-Textures.description"></a><h2>Description</h2>
<p>
These functions allow high-level meta textures (See the
<a class="link" href="cogl-2.0-experimental-High-Level-Meta-Textures.html#CoglMetaTexture" title="CoglMetaTexture"><span class="type">CoglMetaTexture</span></a> interface) to be allocated that may internally be
comprised of multiple 2D texture "slices" with power-of-two sizes.
</p>
<p>
This API can be useful when working with GPUs that don't have
native support for non-power-of-two textures or if you want to load
a texture that is larger than the GPUs maximum texture size limits.
</p>
<p>
The algorithm for slicing works by first trying to map a virtual
size to the next larger power-of-two size and then seeing how many
wasted pixels that would result in. For example if you have a
virtual texture that's 259 texels wide, the next pot size = 512 and
the amount of waste would be 253 texels. If the amount of waste is
above a max-waste threshold then we would next slice that texture
into one that's 256 texels and then looking at how many more texels
remain unallocated after that we choose the next power-of-two size.
For the example of a 259 texel image that would mean having a 256
texel wide texture, leaving 3 texels unallocated so we'd then
create a 4 texel wide texture - now there is only one texel of
waste. The algorithm continues to slice the right most textures
until the amount of waste is less than or equal to a specfied
max-waste threshold. The same logic for slicing from left to right
is also applied from top to bottom.
</p>
</div>
<div class="refsect1">
<a name="cogl-2.0-experimental-Sliced-Textures.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="CoglTexture2DSliced"></a><h3>CoglTexture2DSliced</h3>
<pre class="programlisting">typedef struct _CoglTexture2DSliced CoglTexture2DSliced;</pre>
</div>
<hr>
<div class="refsect2">
<a name="cogl-texture-2d-sliced-new-with-size"></a><h3>cogl_texture_2d_sliced_new_with_size ()</h3>
<pre class="programlisting"><a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="returnvalue">CoglTexture2DSliced</span></a> * cogl_texture_2d_sliced_new_with_size
                                                        (<em class="parameter"><code><span class="type">CoglContext</span> *ctx</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> width</code></em>,
                                                         <em class="parameter"><code>unsigned <span class="type">int</span> height</code></em>,
                                                         <em class="parameter"><code><span class="type">int</span> max_waste</code></em>,
                                                         <em class="parameter"><code><a class="link" href="cogl-2.0-experimental-Common-Types.html#CoglPixelFormat" title="enum CoglPixelFormat"><span class="type">CoglPixelFormat</span></a> internal_format</code></em>,
                                                         <em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
Creates a <a class="link" href="cogl-2.0-experimental-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> that may internally be comprised of
1 or more <a class="link" href="cogl-2.0-experimental-2D-textures.html#CoglTexture2D" title="CoglTexture2D"><span class="type">CoglTexture2D</span></a> textures with power-of-two sizes.
<em class="parameter"><code>max_waste</code></em> is used as a threshold for recursively slicing the
right-most or bottom-most slices into smaller power-of-two sizes
until the wasted padding at the bottom and right of the
power-of-two textures is less than specified.
</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>The virtual width of your sliced texture.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>height</code></em> :</span></p></td>
<td>The virtual height of your sliced texture.</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>max_waste</code></em> :</span></p></td>
<td>The threshold of how wide a strip of wasted texels
are allowed in the non-power-of-two textures before
they must be sliced to reduce the amount of waste.</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-Sliced-Textures.html#CoglTexture2DSliced" title="CoglTexture2DSliced"><span class="type">CoglTexture2DSliced</span></a> or if there was
an error allocating any of the internal slices <code class="literal">NULL</code> is
returned and <em class="parameter"><code>error</code></em> is updated.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
<hr>
<div class="refsect2">
<a name="cogl-is-texture-2d-sliced"></a><h3>cogl_is_texture_2d_sliced ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span>            cogl_is_texture_2d_sliced           (<em class="parameter"><code><span class="type">void</span> *object</code></em>);</pre>
<p>
Gets whether the given object references a <span class="type">CoglTexture2dSliced</span>.
</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> pointer</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 <span class="type">CoglTexture2dSliced</span>
and <code class="literal">FALSE</code> otherwise.</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 1.10</p>
<p class="stability">Stability Level: Unstable</p>
</div>
</div>
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