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[require]
GLSL >= 1.20
[vertex shader passthrough]
[fragment shader]
/*
Test predication on values from large array
Big local arrays may be handled differently than smaller ones, e.g. stored in
a global memory. However drivers may have a subtle error combining this
optimization with helper invocations of fragment shader.
Since all side-effects of helper invocations are being ignored - driver may
also erroneously ignore stores to a local array which was lowered to
a global memory.
This may cause an issue when a control flow in helper invocation depends
on the value written to such array.
To test this we make a loop which depends on a value written to a big local
array, so if stores are being ignored - the loop will become infinite,
causing a hang.
*/
#version 120
int map[2048];
uniform int indexInArray;
void main() {
for (int i = 0; i < map.length(); i++) {
map[i] = 0;
}
int i = min(indexInArray, map.length() - 1);
do {
if(map[i] == 1){
break;
}else{
map[i] = 1;
}
}
while (true);
gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
}
[test]
uniform int indexInArray 500
clear color 0.0 0.0 0.0 0.0
clear
draw rect -1.0 -1.0 2.0 2.0
relative probe rect rgb (0.0, 0.0, 0.5, 0.5) (0.0, 1.0, 0.0)
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