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							#version 450
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							layout (location = 0) out vec4 color;
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							layout (constant_id = 1) const float opacity = 0.5;
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							layout (location = 0) uniform vec3 in_color = vec3(1.0, 0.5, 0);
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							layout (location = 4) uniform float foo = opacity;
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							void main()
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							{
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								color = vec4(in_color, foo);
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							}
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