GL_EXT_raster_multisample
https://www.khronos.org/registry/OpenGL/extensions/NV/NV_framebuffer_mixed_samples.txt
GL_EXT_raster_multisample

	GL_COLOR_SAMPLES_NV 0x8E20
	GL_RASTER_MULTISAMPLE_EXT 0x9327
	GL_RASTER_SAMPLES_EXT 0x9328
	GL_MAX_RASTER_SAMPLES_EXT 0x9329
	GL_RASTER_FIXED_SAMPLE_LOCATIONS_EXT 0x932A
	GL_MULTISAMPLE_RASTERIZATION_ALLOWED_EXT 0x932B
	GL_EFFECTIVE_RASTER_SAMPLES_EXT 0x932C
	GL_DEPTH_SAMPLES_NV 0x932D
	GL_STENCIL_SAMPLES_NV 0x932E
	GL_MIXED_DEPTH_SAMPLES_SUPPORTED_NV 0x932F
	GL_MIXED_STENCIL_SAMPLES_SUPPORTED_NV 0x9330
	GL_COVERAGE_MODULATION_TABLE_NV 0x9331
	GL_COVERAGE_MODULATION_NV 0x9332
	GL_COVERAGE_MODULATION_TABLE_SIZE_NV 0x9333
	void glCoverageModulationNV (GLenum components)
	void glCoverageModulationTableNV (GLsizei n, const GLfloat* v)
	void glGetCoverageModulationTableNV (GLsizei bufsize, GLfloat* v)
	void glRasterSamplesEXT (GLuint samples, GLboolean fixedsamplelocations)