Commit 0721cc8ba09b9c67208d07fa9726b7cc9412465c
2020-01-03T23:26:08
Vulkan: No line raster emulation code if extension A flag is added to the translator to disable generation of Bresenham line raster emulation code when the Bresenham line raster Vulkan extension is present. This is primarily for the sake of conversion of line raster emulation condition to specialization constant: - Avoid dead SPIR-V code in every shader - Avoid ANGLEUniforms being active in every shader stage even if it's not used anywhere but in line raster emulation. - Optimize SPIR-V transformations by both having fewer instructions to iterate through, and to avoid generating line raster patches. - Reduce the severity of anglebug.com/4251 where the location assignment of ANGLEPosition can incorrectly overlap a varying array or struct, by making only platforms without Bresenham extension afflicted by the bug. Bug: angleproject:3394 Change-Id: Ic0ae6ce0392b4eae0cc79cb94bbcd0805b276a31 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1986379 Reviewed-by: Cody Northrop <cnorthrop@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>