GL_ARB_draw_buffers http://www.opengl.org/registry/specs/ARB/draw_buffers.txt GL_ARB_draw_buffers GL_MAX_DRAW_BUFFERS_ARB 0x8824 GL_DRAW_BUFFER0_ARB 0x8825 GL_DRAW_BUFFER1_ARB 0x8826 GL_DRAW_BUFFER2_ARB 0x8827 GL_DRAW_BUFFER3_ARB 0x8828 GL_DRAW_BUFFER4_ARB 0x8829 GL_DRAW_BUFFER5_ARB 0x882A GL_DRAW_BUFFER6_ARB 0x882B GL_DRAW_BUFFER7_ARB 0x882C GL_DRAW_BUFFER8_ARB 0x882D GL_DRAW_BUFFER9_ARB 0x882E GL_DRAW_BUFFER10_ARB 0x882F GL_DRAW_BUFFER11_ARB 0x8830 GL_DRAW_BUFFER12_ARB 0x8831 GL_DRAW_BUFFER13_ARB 0x8832 GL_DRAW_BUFFER14_ARB 0x8833 GL_DRAW_BUFFER15_ARB 0x8834 void glDrawBuffersARB (GLsizei n, const GLenum* bufs)