a476ca1fd1
If EXT_draw_buffers2 is supported but ARB_draw_buffers_blend isn't _mesa_BlendFuncSeparateEXT only sets up the blend equation and function for the first render target. This patch makes sure that update_blend doesn't try to use the data from other rendertargets in such cases. Signed-off-by: Brian Paul <brianp@vmware.com>