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5 <title>OpenGL ES
</title>
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12 <p>Mesa implements OpenGL ES
1.1 and OpenGL ES
2.0. More informations about
13 OpenGL ES can be found at
<a href=
"http://www.khronos.org/opengles/"
14 target=
"_parent"> http://www.khronos.org/opengles/
</a>.
</p>
16 <p>OpenGL ES depends on a working EGL implementation. Please refer to
17 <a href=
"egl.html">Mesa EGL
</a> for more information about EGL.
</p>
19 <h2>Build the Libraries
</h2>
21 <li>Run
<code>configure
</code> with
<code>--enable-gles1 --enable-gles2
</code> and enable the Gallium driver for your hardware.
</li>
22 <li>Build and install Mesa as usual.
</li>
25 Alternatively, if XCB-DRI2 is installed on the system, one can use
26 <code>egl_dri2
</code> EGL driver with OpenGL|ES-enabled DRI drivers
29 <li>Run
<code>configure
</code> with
<code>--enable-gles1 --enable-gles2
</code>.
</li>
30 <li>Build and install Mesa as usual.
</li>
33 <p>Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or more
34 EGL drivers for your hardware.
</p>
36 <h2>Run the Demos
</h2>
38 <p>There are some demos in
<code>mesa/demos
</code> repository.
</p>
42 <h3>Dispatch Table
</h3>
44 <p>OpenGL ES has an additional indirection when dispatching fucntions
</p>
47 Mesa: glFoo() --
> _mesa_Foo()
48 OpenGL ES: glFoo() --
> _es_Foo() --
> _mesa_Foo()
51 <p>The indirection serves several purposes
</p>
54 <li>When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.
</li>
55 <li>When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.
</li>
56 <li>When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.
</li>
59 <p>Other than the last case, OpenGL ES uses
<code>APIspec.xml
</code> to generate functions to check and/or converts the arguments.
</p>