Commit b8281f5d1dd54e0199a982ff471d36761ad01f6a
2025-09-09T17:15:26
Add condition check in emulate dithering shader code Prior to this change, the emulate dithering shader code will write to all elements of gl_FragData, regardless of whether the dither value is zero or not: gl_FragData[i] = gl_FragData[i] + dither_value. If dither_value is 0, then this doesn't change gl_FragData[i] and it incurs unnecessary shader writes. This change adds a boolean variable that is initialized to false, and it is only set to true if dither value for that output element is changed from zero to non-zero value. This way we are only issuing shader write operations when necessary. Bug: angleproject:425733272 Change-Id: Iacfd81ff9a1d7d0f71ecf8d119033b2500d2869e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6931777 Reviewed-by: Charlie Lao <cclao@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>