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This patch adds support for GL_ARB_draw_buffers_blend extension for SM4_1 device. Fixes piglit test fbo-draw-buffers-blend. This patch is squashed with a subsequent patch which fixed a regression. Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Neha Bhende <bhenden@vmware.com> Reviewed-by: Charmaine Lee <charmainel@vmware.com>
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