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5 <title>OpenGL ES</title>
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11 <h1>The Mesa 3D Graphics Library</h1>
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19 <p>Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0. More informations about
20 OpenGL ES can be found at <a href="http://www.khronos.org/opengles/">
21 http://www.khronos.org/opengles/</a>.</p>
23 <p>OpenGL ES depends on a working EGL implementation. Please refer to
24 <a href="egl.html">Mesa EGL</a> for more information about EGL.</p>
26 <h2>Build the Libraries</h2>
28 <li>Run <code>configure</code> with <code>--enable-gles1 --enable-gles2</code> and enable the Gallium driver for your hardware.</li>
29 <li>Build and install Mesa as usual.</li>
32 Alternatively, if XCB-DRI2 is installed on the system, one can use
33 <code>egl_dri2</code> EGL driver with OpenGL|ES-enabled DRI drivers
36 <li>Run <code>configure</code> with <code>--enable-gles1 --enable-gles2</code>.</li>
37 <li>Build and install Mesa as usual.</li>
40 <p>Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or more
41 EGL drivers for your hardware.</p>
43 <h2>Run the Demos</h2>
45 <p>There are some demos in <code>mesa/demos</code> repository.</p>
49 <h3>Dispatch Table</h3>
51 <p>OpenGL ES has an additional indirection when dispatching fucntions</p>
54 Mesa: glFoo() --> _mesa_Foo()
55 OpenGL ES: glFoo() --> _es_Foo() --> _mesa_Foo()
58 <p>The indirection serves several purposes</p>
61 <li>When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.</li>
62 <li>When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.</li>
63 <li>When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.</li>
66 <p>Other than the last case, OpenGL ES uses <code>APIspec.xml</code> to generate functions to check and/or converts the arguments.</p>