GL_EXT_multisample
http://www.opengl.org/registry/specs/EXT/wgl_multisample.txt
GL_EXT_multisample
GL_MULTISAMPLE_EXT 0x809D
GL_SAMPLE_ALPHA_TO_MASK_EXT 0x809E
GL_SAMPLE_ALPHA_TO_ONE_EXT 0x809F
GL_SAMPLE_MASK_EXT 0x80A0
GL_1PASS_EXT 0x80A1
GL_2PASS_0_EXT 0x80A2
GL_2PASS_1_EXT 0x80A3
GL_4PASS_0_EXT 0x80A4
GL_4PASS_1_EXT 0x80A5
GL_4PASS_2_EXT 0x80A6
GL_4PASS_3_EXT 0x80A7
GL_SAMPLE_BUFFERS_EXT 0x80A8
GL_SAMPLES_EXT 0x80A9
GL_SAMPLE_MASK_VALUE_EXT 0x80AA
GL_SAMPLE_MASK_INVERT_EXT 0x80AB
GL_SAMPLE_PATTERN_EXT 0x80AC
GL_MULTISAMPLE_BIT_EXT 0x20000000
void glSampleMaskEXT (GLclampf value, GLboolean invert)
void glSamplePatternEXT (GLenum pattern)