2021-08-13 15:43:21 +00:00
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uniform half4 testInputs; // equals (-1.25, 0, 0.75, 2.25)
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uniform half4 colorGreen, colorRed;
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half4 main(float2 coords) {
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half4 expected = half4(0); // derivative of a constant is zero
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return (dFdx(testInputs.x) == expected.x &&
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dFdx(testInputs.xy) == expected.xy &&
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dFdx(testInputs.xyz) == expected.xyz &&
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dFdx(testInputs.xyzw) == expected.xyzw) ? colorGreen : colorRed;
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/*
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// TODO(skia:12340): This test triggers an RTFlip bug in the SPIR-V code generator
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sign(dFdx(coords.xx)) == half2(1, 1) &&
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sign(dFdx(coords.yy)) == half2(0, 0) &&
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sign(dFdx(coords.xy)) == half2(1, 0)
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*/
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}
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