GL_ARB_multisample http://www.opengl.org/registry/specs/ARB/multisample.txt GL_ARB_multisample GL_MULTISAMPLE_ARB 0x809D GL_SAMPLE_ALPHA_TO_COVERAGE_ARB 0x809E GL_SAMPLE_ALPHA_TO_ONE_ARB 0x809F GL_SAMPLE_COVERAGE_ARB 0x80A0 GL_SAMPLE_BUFFERS_ARB 0x80A8 GL_SAMPLES_ARB 0x80A9 GL_SAMPLE_COVERAGE_VALUE_ARB 0x80AA GL_SAMPLE_COVERAGE_INVERT_ARB 0x80AB GL_MULTISAMPLE_BIT_ARB 0x20000000 void glSampleCoverageARB (GLclampf value, GLboolean invert)