skia2/tests/sksl/workarounds/FractNegative.sksl
John Stiles 0ed9f31f6a Migrate several GLSL workaround unit tests to golden files.
We now support building an SkSL golden output twice, once honoring the
custom #pragma settings, and once more ignoring the settings. This
allows us to see the output of the workaround technique, alongside the
"default-settings" output which should not contain a workaround.

To implement this, skslc now supports a flag: --[no]settings.
When it's set, /*#pragma settings*/ comments are honored. When it's not
set, skslc ignores the comments. compile_sksl_tests.py passes this flag
along to skslc.

This approach is not strictly limited to workarounds; the
"TypePrecision" GLSL test was also updated to use this technique.

Change-Id: I79204df047b024533ed6bc1f4c088e0e878d5bb1
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/317246
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
2020-09-17 16:41:18 +00:00

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/*#pragma settings CannotUseFractForNegativeValues*/
void main() {
float x = -42.0;
sk_FragColor.r = half(fract(x));
}