luboslenco
34 lines
1.1 KiB
GLSL
34 lines
1.1 KiB
GLSL
#version 450
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uniform sampler2D tex;
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// uniform sampler2D histogram;
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uniform float vignette_strength;
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uniform float grain_strength;
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in vec2 tex_coord;
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out vec4 frag_color;
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// Based on Filmic Tonemapping Operators http://filmicgames.com/archives/75
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vec3 tonemap_filmic(const vec3 color) {
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vec3 x = max(vec3(0.0, 0.0, 0.0), color - 0.004);
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return (x * (6.2 * x + 0.5)) / (x * (6.2 * x + 1.7) + 0.06);
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}
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void main() {
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frag_color = textureLod(tex, tex_coord, 0.0);
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// Static grain
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float x = (tex_coord.x + 4.0) * (tex_coord.y + 4.0) * 10.0;
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float g = mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005;
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frag_color.rgb += vec3(g, g, g) * grain_strength;
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frag_color.rgb *= (1.0 - vignette_strength) + vignette_strength * pow(16.0 * tex_coord.x * tex_coord.y * (1.0 - tex_coord.x) * (1.0 - tex_coord.y), 0.2);
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// Auto exposure
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// const float auto_exposure_strength = 1.0;
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// float expo = 2.0 - clamp(length(textureLod(histogram, vec2(0.5, 0.5), 0.0).rgb), 0.0, 1.0);
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// frag_color.rgb *= pow(expo, auto_exposure_strength * 2.0);
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frag_color.rgb = tonemap_filmic(frag_color.rgb); // With gamma
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}
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