1GL_SGI_color_matrix 2http://www.opengl.org/registry/specs/SGI/color_matrix.txt 3GL_SGI_color_matrix 4 GL_COLOR_MATRIX_SGI 0x80B1 5 GL_COLOR_MATRIX_STACK_DEPTH_SGI 0x80B2 6 GL_MAX_COLOR_MATRIX_STACK_DEPTH_SGI 0x80B3 7 GL_POST_COLOR_MATRIX_RED_SCALE_SGI 0x80B4 8 GL_POST_COLOR_MATRIX_GREEN_SCALE_SGI 0x80B5 9 GL_POST_COLOR_MATRIX_BLUE_SCALE_SGI 0x80B6 10 GL_POST_COLOR_MATRIX_ALPHA_SCALE_SGI 0x80B7 11 GL_POST_COLOR_MATRIX_RED_BIAS_SGI 0x80B8 12 GL_POST_COLOR_MATRIX_GREEN_BIAS_SGI 0x80B9 13 GL_POST_COLOR_MATRIX_BLUE_BIAS_SGI 0x80BA 14 GL_POST_COLOR_MATRIX_ALPHA_BIAS_SGI 0x80BB 15