unsigned r600_blit(GLcontext *ctx,
                   struct radeon_bo *src_bo,
                   intptr_t src_offset,
                   gl_format src_mesaformat,
                   unsigned src_pitch,
                   unsigned src_width,
                   unsigned src_height,
                   unsigned src_x_offset,
                   unsigned src_y_offset,
                   struct radeon_bo *dst_bo,
                   intptr_t dst_offset,
                   gl_format dst_mesaformat,
                   unsigned dst_pitch,
                   unsigned dst_width,
                   unsigned dst_height,
                   unsigned dst_x_offset,
                   unsigned dst_y_offset,
                   unsigned w,
                   unsigned h,
                   unsigned flip_y);