Hi,
It seems there is a bug in the compiler. The problem may be reproduced
with the following shader (complete shader_test file attached):
void main()
{
float f = 0.0;
while (true) {
f = 1.0;
break;
f = 0.5;
}
gl_FragColor = vec4(1.0 - f, f, 0.0, 1.0);
}
The result of compilation is equal to:
while (true) {
break;
}
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
In other words, GLSL compiler eliminates both assignments to "f" in the
loop body and the resulting value of the "f" variable is 0.
Vadim
[require]
GLSL >= 1.20
[vertex shader]
void main()
{
gl_Position = gl_Vertex;
}
[fragment shader]
void main()
{
float f = 0.0;
while (true) {
f = 1.0;
break;
f = 0.5;
}
gl_FragColor = vec4(1.0 - f, f, 0.0, 1.0);
}
[test]
clear color 0.0 0.0 0.0 0.0
clear
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 1.0
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