skia2/tests/sksl/shared/DeadStripFunctions.glsl
John Stiles 2654187396 Eliminate unused local variables during SkSL optimization.
This can eliminate const variables which have been completely folded
away, unnecessary synthetic variables created during codegen/inlining,
or code that simply didn't need to exist at all.

Change-Id: I37a65e455e6527a6a6c2f4dde918f48d84dc2638
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/383496
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
2021-03-16 17:22:53 +00:00

22 lines
439 B
GLSL

out vec4 sk_FragColor;
uniform vec4 colorGreen;
uniform vec4 colorRed;
vec4 unpremul(vec4 color) {
return vec4(color.xyz / max(color.w, 9.9999997473787516e-05), color.w);
}
vec4 live_fn(vec4 a, vec4 b) {
return a + b;
}
vec4 main() {
vec4 a;
vec4 b;
{
a = live_fn(vec4(3.0), vec4(-5.0));
}
{
b = unpremul(vec4(1.0));
}
return a != vec4(0.0) && b != vec4(0.0) ? colorGreen : colorRed;
}