c4e9588621
Global variables which can be calculated in C++ code are now written as
constant values in the DSL, instead of performing the same logic
redundantly in the shader.
In some cases this can be fairly significant, e.g. RectBlurEffect has
a global with the expression
abs(rect.x) > 16000 || abs(rect.y) > 16000 ||
abs(rect.z) > 16000 || abs(rect.w) > 16000
Change-Id: I84221f60a4986b3225afcf91ef95cdcfc941b4b7
Bug: skia:11854
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/401437
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
47 lines
1.4 KiB
GLSL
47 lines
1.4 KiB
GLSL
layout(key) in half one; // always equals 1.0
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layout(key, when=one != 1.0f) in half unused; // never used
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layout(key) float alsoUnused = one + one; // also never used
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half4 main() {
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half4 color = half4(0);
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// Basic if statement. (00 == 00: true --> color=0001)
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if (color.rg == color.ba) color.a = one;
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// Basic if statement with Block. (00 == 01: false)
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if (color.rg == color.ba) {
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color.r = color.a;
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}
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// TODO(skia:11872): Add test for If statement with comma-expression statement instead of Block.
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// Basic if-else statement. (0 == 0: true --> color=1011)
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if (color.r == color.g) color = color.araa; else color = color.rrra;
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// Chained if-else statements.
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if (color.r + color.g + color.b + color.a == one) { // (3 == 1: false)
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color = half4(-1);
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} else if (color.r + color.g + color.b + color.a == 2) { // (3 == 2: false)
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color = half4(-2);
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} else {
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color = color.ggaa; // (color=0011)
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}
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// Nested if-else statements.
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if (color.r == one) { // (0 == 1: false)
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if (color.r == 2) {
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color = color.rrrr;
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} else {
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color = color.gggg;
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}
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} else {
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if (color.b * color.a == one) { // (1*1 == 1: true)
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color = color.rbga; // (color = 0101)
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} else {
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color = color.aaaa;
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}
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}
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return color;
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}
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