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<title>WebGL GLSL Conformance Tests</title>
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// A matrix constructor with two writes and reads to the same variable inside it in different parameters must succeed "mat2(index++, vec4(index++))"
// ESSL 1.00 spec section 5.4 Constructors: "Arguments are evaluated from left to right."
precision mediump float;
bool equal(mat2 m1, mat2 m2)
{
    float EPSILON = 0.00001;
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
            if (abs(m1[i][j] - m2[i][j]) > EPSILON)
                return false;
        }
    }
    return true;
}
void main()
{
    int i = 0;
    mat2 m = mat2(i++, vec4(i++));
    if (equal(m, mat2(0, 1, 1, 1)))
        gl_FragColor = vec4(0.0, 1.0, 0.0, 1.0);
    else
        gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
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GLSLConformanceTester.runRenderTest();
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