skia2/resources/sksl/workarounds/FractNegative.sksl

/*#pragma settings CannotUseFractForNegativeValues*/

void main() {
    float x = -42.0;
    sk_FragColor.r = half(fract(x));
}
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> 2020-09-16 21:46:37 +00:00			`/#pragma settings CannotUseFractForNegativeValues/`

			`void main() {`
			`float x = -42.0;`
			`sk_FragColor.r = half(fract(x));`
			`}`