53 lines
1.6 KiB
GLSL
53 lines
1.6 KiB
GLSL
precision mediump float;
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varying vec2 vUv;
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uniform sampler2D uSource;
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uniform float uExposureFactor;
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uniform float uContrastFactor;
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uniform float uBrightnessShift;
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uniform float uHighlights;
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uniform float uShadows;
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uniform float uWhites;
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uniform float uBlacks;
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uniform float uVignetteAmount;
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uniform float uVignetteSize;
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uniform float uVignetteRoundness;
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float toByte(float value) {
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return clamp(floor(value + 0.5), 0.0, 255.0);
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}
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void main() {
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vec4 color = texture2D(uSource, vUv);
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vec3 rgb = color.rgb * 255.0;
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rgb *= uExposureFactor;
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rgb = (rgb - 128.0) * uContrastFactor + 128.0 + uBrightnessShift;
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float luma = dot(rgb, vec3(0.2126, 0.7152, 0.0722));
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float highlightsBoost = (luma / 255.0) * uHighlights * 40.0;
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float shadowsBoost = ((255.0 - luma) / 255.0) * uShadows * 40.0;
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float whitesBoost = (luma / 255.0) * uWhites * 35.0;
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float blacksBoost = ((255.0 - luma) / 255.0) * uBlacks * 35.0;
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float totalBoost = highlightsBoost + shadowsBoost + whitesBoost + blacksBoost;
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rgb = vec3(
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toByte(rgb.r + totalBoost),
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toByte(rgb.g + totalBoost),
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toByte(rgb.b + totalBoost)
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);
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if (uVignetteAmount > 0.0) {
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vec2 centeredUv = (vUv - vec2(0.5)) / vec2(0.5);
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float radialDistance = length(centeredUv);
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float softEdge = pow(1.0 - clamp(radialDistance, 0.0, 1.0), 1.0 + uVignetteRoundness);
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float strength = 1.0 - uVignetteAmount * (1.0 - softEdge) * (1.5 - uVignetteSize);
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rgb = vec3(
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toByte(rgb.r * strength),
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toByte(rgb.g * strength),
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toByte(rgb.b * strength)
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);
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}
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gl_FragColor = vec4(clamp(rgb / 255.0, 0.0, 1.0), color.a);
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}
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