1GL_ARB_sample_shading 2http://www.opengl.org/registry/specs/ARB/sample_shading.txt 3GL_ARB_sample_shading 4 5 GL_SAMPLE_SHADING_ARB 0x8C36 6 GL_MIN_SAMPLE_SHADING_VALUE_ARB 0x8C37 7 void glMinSampleShadingARB (GLclampf value) 8