50 lines
936 B
GLSL
50 lines
936 B
GLSL
#version 450
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layout(location=0) in vec2 inUV;
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layout(location=0) out vec4 outColor;
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layout(set=0, binding=0) uniform sampler2D uHdr;
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layout(push_constant) uniform Push
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{
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float exposure;
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int mode;
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} pc;
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vec3 reinhard(vec3 x)
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{
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return x / (1.0 + x);
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}
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// Narkowicz ACES approximation
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vec3 aces_tonemap(vec3 x)
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{
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// https://64.github.io/tonemapping/
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const float a = 2.51;
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const float b = 0.03;
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const float c = 2.43;
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const float d = 0.59;
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const float e = 0.14;
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return clamp((x*(a*x+b))/(x*(c*x+d)+e), 0.0, 1.0);
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}
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void main()
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{
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vec3 hdr = texture(uHdr, inUV).rgb;
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// Simple exposure
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float exposure = max(pc.exposure, 0.0001);
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vec3 mapped = hdr * exposure;
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if (pc.mode == 1)
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mapped = aces_tonemap(mapped);
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else
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mapped = reinhard(mapped);
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const float gamma = 2.2;
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mapped = pow(mapped, vec3(1.0 / gamma));
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outColor = vec4(mapped, 1.0);
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}
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