On 07/18/2012 12:16 PM, Paul Berry wrote: > This patch series cleans up a bug fix I made to Mesa on June 22 > (commit 82d2596: i965: Compute dFdy() correctly for FBOs). The bug > was that the i965 driver wasn't adjusting the dFdy() logic to account > for the fact that window system framebuffers use flipped Y coordinates > compared to FBOs. The fix was to compile fragment shaders differently > when they are used for FBOs vs window system framebuffers. > > Commit 82d2596 conservatively assumed that all fragment shader > programs might use dFdy(), so it recompiled all of them when switching > between FBOs and window system framebuffers. For shaders that don't > use dFdy(), the recompile is an unnecessary performance hit. This > patch series adds accounting to core mesa to keep track of whether or > not a shader uses dFdy(), and changes the i965 back-end to only > recompile shaders that actually need it. > > Patches 1-3 may be of interest to non-i965 developers, since the > accounting in core Mesa applies to all back-ends. > > [PATCH 1/4] mesa: Add UsesDFdy to struct gl_fragment_program. > [PATCH 2/4] mesa: Set UsesDFdy appropriately for assembly programs. > [PATCH 3/4] glsl: Set UsesDFdy appropriately for GLSL shaders. > [PATCH 4/4] i965: Avoid unnecessary recompiles for shaders that don't use > dFdy().
Looks fine to me, but please get Ian's ack before pushing. For the series: Reviewed-by: Kenneth Graunke <kenn...@whitecape.org> _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
