1GL_ARB_multisample 2http://oss.sgi.com/projects/ogl-sample/registry/ARB/multisample.txt 3 GL_MULTISAMPLE_ARB 0x809D 4 GL_SAMPLE_ALPHA_TO_COVERAGE_ARB 0x809E 5 GL_SAMPLE_ALPHA_TO_ONE_ARB 0x809F 6 GL_SAMPLE_COVERAGE_ARB 0x80A0 7 GL_SAMPLE_BUFFERS_ARB 0x80A8 8 GL_SAMPLES_ARB 0x80A9 9 GL_SAMPLE_COVERAGE_VALUE_ARB 0x80AA 10 GL_SAMPLE_COVERAGE_INVERT_ARB 0x80AB 11 GL_MULTISAMPLE_BIT_ARB 0x20000000 12 void glSampleCoverageARB (GLclampf value, GLboolean invert) 13