45 lines
1.1 KiB
GLSL
45 lines
1.1 KiB
GLSL
#version 310 es
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precision mediump float;
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layout(location = 0) out float FragColor;
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layout(location = 0) flat in int index;
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const float LUT[16] = float[](
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1.0, 2.0, 3.0, 4.0,
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1.0, 2.0, 3.0, 4.0,
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1.0, 2.0, 3.0, 4.0,
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1.0, 2.0, 3.0, 4.0);
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void main()
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{
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// Try reading LUTs, both in branches and not branch.
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FragColor = LUT[index];
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if (index < 10)
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FragColor += LUT[index ^ 1];
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else
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FragColor += LUT[index & 1];
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// Not declared as a LUT, but can be promoted to one.
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vec4 foo[4] = vec4[](vec4(0.0), vec4(1.0), vec4(8.0), vec4(5.0));
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if (index > 30)
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{
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FragColor += foo[index & 3].y;
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}
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else
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{
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FragColor += foo[index & 1].x;
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}
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// Not declared as a LUT, but this cannot be promoted, because we have a partial write.
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vec4 foobar[4] = vec4[](vec4(0.0), vec4(1.0), vec4(8.0), vec4(5.0));
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if (index > 30)
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{
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foobar[1].z = 20.0;
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}
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FragColor += foobar[index & 3].z;
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// Not declared as a LUT, but this cannot be promoted, because we have two complete writes.
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vec4 baz[4] = vec4[](vec4(0.0), vec4(1.0), vec4(8.0), vec4(5.0));
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baz = vec4[](vec4(20.0), vec4(30.0), vec4(50.0), vec4(60.0));
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FragColor += baz[index & 3].z;
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}
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