hdrtexture.frag - mozsearch

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#version 440

layout(location = 0) in vec2 v_texcoord;

layout(location = 0) out vec4 fragColor;

layout(std140, binding = 0) uniform buf {

    mat4 mvp;

    int flip;

    int sdr;

    float tonemapInMax;

    float tonemapOutMax;

} ubuf;

layout(binding = 1) uniform sampler2D tex;

vec3 linearToSRGB(vec3 color)

    vec3 S1 = sqrt(color);

    vec3 S2 = sqrt(S1);

    vec3 S3 = sqrt(S2);

    return 0.585122381 * S1 + 0.783140355 * S2 - 0.368262736 * S3;

// https://learn.microsoft.com/en-us/windows/win32/direct3darticles/high-dynamic-range

vec3 simpleReinhardTonemapper(vec3 c, float inMax, float outMax)

    c /= vec3(inMax);

    c.r = c.r / (1 + c.r);

    c.g = c.g / (1 + c.g);

    c.b = c.b / (1 + c.b);

    c *= vec3(outMax);

    return c;

void main()

    vec4 c = texture(tex, v_texcoord);

    if (ubuf.tonemapInMax != 0)

        c.rgb = simpleReinhardTonemapper(c.rgb, ubuf.tonemapInMax, ubuf.tonemapOutMax);

    else if (ubuf.sdr != 0)

        c.rgb = linearToSRGB(c.rgb);

    fragColor = vec4(c.rgb * c.a, c.a);