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#version 450
#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shading_language_420pack : enable
layout (set = 0, binding = 0) uniform UBO {
mat4 projection;
mat4 model;
mat4 view;
vec4 camPos;
float exposure;
float gamma;
} ubo;
layout (input_attachment_index = 0, set = 1, binding = 4) uniform subpassInputMS samplerHDR;
layout (set = 0, binding = 8) uniform sampler2D samplerUI;
layout (location = 0) in vec2 inUV;
layout (location = 0) out vec4 outColor;
vec3 Uncharted2Tonemap(vec3 color)
{
const float A = 0.15;
const float B = 0.50;
const float C = 0.10;
const float D = 0.20;
const float E = 0.02;
const float F = 0.30;
const float W = 11.2;
return ((color*(A*color+C*B)+D*E)/(color*(A*color+B)+D*F))-E/F;
}
vec3 tonemap(vec3 color)
{
vec3 outcol = Uncharted2Tonemap(color.rgb * ubo.exposure);
outcol = outcol * (1.0f / Uncharted2Tonemap(vec3(11.2f)));
return pow(outcol, vec3(1.0f / ubo.gamma));
}
vec3 SRGBtoLINEAR(vec3 srgbIn)
{
#ifdef MANUAL_SRGB
#ifdef SRGB_FAST_APPROXIMATION
return pow(srgbIn.xyz,vec3(2.2));
#else //SRGB_FAST_APPROXIMATION
vec3 bLess = step(vec3(0.04045),srgbIn.xyz);
return linOut = mix( srgbIn.xyz/vec3(12.92), pow((srgbIn.xyz+vec3(0.055))/vec3(1.055),vec3(2.4)), bLess );
#endif //SRGB_FAST_APPROXIMATION
#else //MANUAL_SRGB
return srgbIn;
#endif //MANUAL_SRGB
}
void main()
{
vec4 hdrColor = subpassLoad(samplerHDR, gl_SampleID);
vec4 ui = texture(samplerUI, inUV);
outColor = (hdrColor.a - ui.a) * vec4(SRGBtoLINEAR(tonemap(hdrColor.rgb)), 1.0) + ui;
/*
vec3 mapped = vec3(1.0) - exp(-hdrColor.rgb * ubo.exposure);
mapped = pow(mapped, vec3(1.0 / ubo.gamma));
outColor = vec4(mapped, hdrColor.a);*/
}
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