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/* From section 5.6 "Matrix Components" of the GLSL 1.20 spec:
*
* "Behavior is undefined when accessing a component outside the bounds
* of a matrix with a non-constant expression."
*
* The behaviour becomes defined only in robustness extensions, however even
* if driver is technically allowed to crash or hang, it most likely
* doesn't want to.
*/
[require]
GLSL >= 1.20
[vertex shader passthrough]
[fragment shader]
#version 120
uniform int index;
void main()
{
mat4 mat = mat4(1.0);
if (mat[index][0] >= 1.0) {
mat[index] = vec4(-1.0);
}
gl_FragColor = mat[index];
}
[test]
uniform int index -1
draw rect -1 -1 2 2
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