28 lines
730 B
Forth
28 lines
730 B
Forth
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// https://www.shadertoy.com/view/lslGzl
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vec3 uncharted2Tonemap(const vec3 x) {
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const float A = 0.15;
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const float B = 0.50;
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const float C = 0.10;
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const float D = 0.20;
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const float E = 0.02;
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const float F = 0.30;
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return ((x * (A * x + C * B) + D * E) / (x * (A * x + B) + D * F)) - E / F;
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}
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vec3 tonemapUncharted2(const vec3 color) {
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const float W = 11.2;
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const float exposureBias = 2.0;
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vec3 curr = uncharted2Tonemap(exposureBias * color);
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vec3 whiteScale = 1.0 / uncharted2Tonemap(vec3(W));
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return curr * whiteScale;
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}
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out vec4 color;
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void main(void) {
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vec2 uv = TEXCOORD.st;
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vec4 src = texture2D(iChannel0, uv);
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color = vec4( tonemapUncharted2(src.xyz), src.a);
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}
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