OpenGL ES

Mesa implements OpenGL ES 1.1 and OpenGL ES 2.0. More informations about OpenGL ES can be found at http://www.khronos.org/opengles/.

OpenGL ES depends on a working EGL implementation. Please refer to Mesa EGL for more information about EGL.

Build the Libraries

1. Run configure with --enable-gles1 --enable-gles2 and enable the Gallium driver for your hardware.
2. Build and install Mesa as usual.

Alternatively, if XCB-DRI2 is installed on the system, one can use egl_dri2 EGL driver with OpenGL|ES-enabled DRI drivers

1. Run configure with --enable-gles1 --enable-gles2.
2. Build and install Mesa as usual.

Both methods will install libGLESv1_CM, libGLESv2, libEGL, and one or more EGL drivers for your hardware.

Run the Demos

There are some demos in mesa/demos repository.

Developers

Dispatch Table

OpenGL ES has an additional indirection when dispatching fucntions

  Mesa:       glFoo() --> _mesa_Foo()
  OpenGL ES:  glFoo() --> _es_Foo() --> _mesa_Foo()

The indirection serves several purposes

• When a function is in Mesa and the type matches, it checks the arguments and calls the Mesa function.
• When a function is in Mesa but the type mismatches, it checks and converts the arguments before calling the Mesa function.
• When a function is not available in Mesa, or accepts arguments that are not available in OpenGL, it provides its own implementation.

Other than the last case, OpenGL ES uses APIspec.xml to generate functions to check and/or converts the arguments.