1cb93a386Sopenharmony_ciuniform half4 testInputs; // equals (-1.25, 0, 0.75, 2.25) 2cb93a386Sopenharmony_ciuniform half4 colorGreen, colorRed; 3cb93a386Sopenharmony_ci 4cb93a386Sopenharmony_cihalf4 main(float2 coords) { 5cb93a386Sopenharmony_ci half4 expected = half4(0); // derivative of a constant is zero 6cb93a386Sopenharmony_ci return (dFdx(testInputs.x) == expected.x && 7cb93a386Sopenharmony_ci dFdx(testInputs.xy) == expected.xy && 8cb93a386Sopenharmony_ci dFdx(testInputs.xyz) == expected.xyz && 9cb93a386Sopenharmony_ci dFdx(testInputs.xyzw) == expected.xyzw && 10cb93a386Sopenharmony_ci sign(fwidth(coords.xx)) == half2(1, 1) && 11cb93a386Sopenharmony_ci sign(fwidth(coords.x1)) == half2(1, 0) && 12cb93a386Sopenharmony_ci sign(fwidth(coords.yy)) == half2(1, 1) && 13cb93a386Sopenharmony_ci sign(fwidth(coords.0y)) == half2(0, 1) && 14cb93a386Sopenharmony_ci sign(fwidth(coords.xy)) == half2(1, 1)) ? colorGreen : colorRed; 15cb93a386Sopenharmony_ci} 16