43 lines
677 B
GLSL
43 lines
677 B
GLSL
#version {{version}}
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precision highp float;
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uniform sampler2D uAreaLUT;
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in vec2 vFrom;
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in vec2 vTo;
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out vec4 oFragColor;
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void main(){
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vec2 from = vFrom, to = vTo;
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vec2 left = from . x < to . x ? from : to, right = from . x < to . x ? to : from;
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vec2 window = clamp(vec2(from . x, to . x), - 0.5, 0.5);
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float offset = mix(window . x, window . y, 0.5)- left . x;
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float t = offset /(right . x - left . x);
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float y = mix(left . y, right . y, t);
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float d =(right . y - left . y)/(right . x - left . x);
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float dX = window . x - window . y;
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oFragColor = vec4(texture(uAreaLUT, vec2(y + 8.0, abs(d * dX))/ 16.0). r * dX);
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}
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