Native bindings to the OES_get_program_binary extension.

This extension introduces two new commands. GetProgramBinaryOES empowers an application to use the GL itself as an offline compiler. The resulting program binary can be reloaded into the GL via ProgramBinaryOES. This is a very useful path for applications that wish to remain portable by shipping pure GLSL source shaders, yet would like to avoid the cost of compiling their shaders at runtime. Instead an application can supply its GLSL source shaders during first application run, or even during installation. The application then compiles and links its shaders and reads back the program binaries. On subsequent runs, only the program binaries need be supplied! Though the level of optimization may not be identical -- the offline shader compiler may have the luxury of more aggressive optimization at its disposal -- program binaries generated online by the GL are interchangeable with those generated offline by an SDK tool.

Note that an implementation supporting this extension need not include an online compiler. That is, it is not required to support loading GLSL shader sources via the ShaderSource command. A query of boolean value SHADER_COMPILER can be used to determine if an implementation supports a shader compiler. If not, the GetProgramBinaryOES command is rendered virtually useless, but the ProgramBinaryOES command may still be used by vendor extensions as a standard method for loading offline-compiled program binaries.

Requires GLES 2.0.