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#version 450 layout(location = 0) out vec4 out_color; void main() { vec2 coord = gl_FragCoord.xy; bool facing = gl_FrontFacing; float face = (facing ? 1.0 : 0.25); out_color = vec4((coord.x * 0.0), (coord.y * 0.0), face, 1.0); }