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This time, let's use proper Sphinx roles for the referenes, so we can reference documents and inline refs. Reviewed-by: Eric Anholt <eric@anholt.net> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5471>
55 lines
1.6 KiB
ReStructuredText
55 lines
1.6 KiB
ReStructuredText
OpenGL ES
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=========
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Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0. More information about
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OpenGL ES can be found at https://www.khronos.org/opengles/.
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OpenGL ES depends on a working EGL implementation. Please refer to
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:doc:`Mesa EGL <egl>` for more information about EGL.
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Build the Libraries
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-------------------
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#. Run ``meson configure`` with ``-D gles1=true -D gles2=true`` and
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enable the Gallium driver for your hardware.
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#. Build and install Mesa as usual.
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Alternatively, if XCB-DRI2 is installed on the system, one can use
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``egl_dri2`` EGL driver with OpenGL|ES-enabled DRI drivers
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#. Run ``meson configure`` with ``-D gles1=true -D gles2=true``.
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#. Build and install Mesa as usual.
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Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or
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more EGL drivers for your hardware.
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Run the Demos
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-------------
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There are some demos in ``mesa/demos`` repository.
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Developers
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----------
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Dispatch Table
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~~~~~~~~~~~~~~
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OpenGL ES has an additional indirection when dispatching functions
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::
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Mesa: glFoo() --> _mesa_Foo()
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OpenGL ES: glFoo() --> _es_Foo() --> _mesa_Foo()
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The indirection serves several purposes
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- When a function is in Mesa and the type matches, it checks the
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arguments and calls the Mesa function.
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- When a function is in Mesa but the type mismatches, it checks and
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converts the arguments before calling the Mesa function.
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- When a function is not available in Mesa, or accepts arguments that
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are not available in OpenGL, it provides its own implementation.
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Other than the last case, OpenGL ES uses ``APIspec.xml`` to generate
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functions to check and/or converts the arguments.
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