blob: 672a018e977f74ea252dbb2c8438dbd1a645e1d2 [file] [log] [blame]
uniform half4 colorGreen, colorRed;
bool test_same_vectors(bool eq, float f1, float f2, float f3, float f4) {
float one = colorGreen.r + 1;
vec4 a = float4(f1, f2, f3, f4);
vec4 b = float4(f1 * one, f2 * one, f3 * one, f4 * one);
return eq ? a == b : a != b;
}
bool test_diff_vectors(bool eq, float f1, float f2, float f3, float f4) {
float two = colorGreen.r + 2;
vec4 a = float4(f1, f2, f3, f4);
vec4 b = float4(f1 * two, f2 * two, f3 * two, f4 * two);
return eq ? a == b : a != b;
}
vec4 main(vec2 coords) {
float NAN1 = colorGreen.r/colorGreen.b;
float NAN2 = colorGreen.b/colorGreen.r;
float ZP = +colorGreen.r*colorGreen.b;
float ZM = -colorGreen.r*colorGreen.b;
float F42 = colorGreen.g * 42.0;
float F43 = colorGreen.g * 43.0;
float F44 = colorGreen.g * 44.0;
float F45 = colorGreen.g * 45.0;
bool EQ = true; // Tests for ==
bool NE = false; // Tests for !=
return true
&& test_same_vectors(EQ, F42, ZM, ZP, F43) // equal, including -0 and +0 values
&& !test_same_vectors(NE, F42, ZM, ZP, F43) // not (not equal)
&& test_same_vectors(NE, F42, NAN1, NAN2, F43) // NA values always not equal
&& !test_same_vectors(EQ, F42, NAN1, NAN2, F43)
&& test_diff_vectors(NE, F42, F43, F44, F45) // one of the normal values not equal
&& !test_diff_vectors(EQ, F42, F43, F44, F45)
&& test_diff_vectors(NE, NAN1, ZM, ZP, F42) // one of the normal values not equal
&& !test_diff_vectors(EQ, NAN1, ZM, ZP, F42)
? colorGreen : colorRed;
}