1GL_NV_framebuffer_multisample_coverage
2http://developer.download.nvidia.com/opengl/specs/GL_NV_framebuffer_multisample_coverage.txt
3GL_NV_framebuffer_multisample_coverage
4
5	GL_RENDERBUFFER_COVERAGE_SAMPLES_NV 0x8CAB
6	GL_RENDERBUFFER_COLOR_SAMPLES_NV  0x8E10
7	GL_MAX_MULTISAMPLE_COVERAGE_MODES_NV 0x8E11
8	GL_MULTISAMPLE_COVERAGE_MODES_NV 0x8E12
9	void glRenderbufferStorageMultisampleCoverageNV (GLenum target, GLsizei coverageSamples, GLsizei colorSamples, GLenum internalformat, GLsizei width, GLsizei height)
10