GL_ATI_draw_buffers http://www.opengl.org/registry/specs/ATI/draw_buffers.txt GL_ATI_draw_buffers GL_MAX_DRAW_BUFFERS_ATI 0x8824 GL_DRAW_BUFFER0_ATI 0x8825 GL_DRAW_BUFFER1_ATI 0x8826 GL_DRAW_BUFFER2_ATI 0x8827 GL_DRAW_BUFFER3_ATI 0x8828 GL_DRAW_BUFFER4_ATI 0x8829 GL_DRAW_BUFFER5_ATI 0x882A GL_DRAW_BUFFER6_ATI 0x882B GL_DRAW_BUFFER7_ATI 0x882C GL_DRAW_BUFFER8_ATI 0x882D GL_DRAW_BUFFER9_ATI 0x882E GL_DRAW_BUFFER10_ATI 0x882F GL_DRAW_BUFFER11_ATI 0x8830 GL_DRAW_BUFFER12_ATI 0x8831 GL_DRAW_BUFFER13_ATI 0x8832 GL_DRAW_BUFFER14_ATI 0x8833 GL_DRAW_BUFFER15_ATI 0x8834 void glDrawBuffersATI (GLsizei n, const GLenum* bufs)