133 lines
3.9 KiB
GLSL
133 lines
3.9 KiB
GLSL
#version 330 core
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out vec4 FragColor;
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in vec2 TexCoord;
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uniform sampler2D sceneTex;
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uniform sampler2D bloomTex;
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uniform sampler2D historyTex;
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uniform bool enableBloom = false;
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uniform float bloomIntensity = 0.8;
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uniform bool enableColorAdjust = false;
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uniform float exposure = 0.0; // EV stops
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uniform float contrast = 1.0;
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uniform float saturation = 1.0;
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uniform vec3 colorFilter = vec3(1.0);
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uniform bool enableMotionBlur = false;
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uniform bool hasHistory = false;
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uniform float motionBlurStrength = 0.15;
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uniform bool enableVignette = false;
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uniform float vignetteIntensity = 0.35;
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uniform float vignetteSmoothness = 0.25;
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uniform bool enableChromatic = false;
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uniform float chromaticAmount = 0.0025;
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uniform bool enableAO = false;
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uniform float aoRadius = 0.0035;
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uniform float aoStrength = 0.6;
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vec3 applyColorAdjust(vec3 color) {
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if (enableColorAdjust) {
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color *= exp2(exposure);
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color = (color - 0.5) * contrast + 0.5;
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float luma = dot(color, vec3(0.299, 0.587, 0.114));
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color = mix(vec3(luma), color, saturation);
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color *= colorFilter;
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}
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return color;
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}
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vec3 sampleBase(vec2 uv) {
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return applyColorAdjust(texture(sceneTex, uv).rgb);
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}
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float luminance(vec3 c) {
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return dot(c, vec3(0.299, 0.587, 0.114));
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}
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float computeVignette(vec2 uv) {
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float dist = length(uv - vec2(0.5));
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float vig = smoothstep(0.8 - vignetteIntensity, 1.0 + vignetteSmoothness, dist);
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return clamp(1.0 - vig * vignetteIntensity, 0.0, 1.0);
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}
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vec3 applyChromatic(vec2 uv) {
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vec3 base = sampleBase(uv);
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vec2 dir = uv - vec2(0.5);
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float dist = max(length(dir), 0.0001);
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vec2 offset = normalize(dir) * chromaticAmount * (1.0 + dist * 2.0);
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vec3 rSample = sampleBase(uv + offset);
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vec3 bSample = sampleBase(uv - offset);
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vec3 ca = vec3(rSample.r, base.g, bSample.b);
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return mix(base, ca, 0.85);
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}
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float computeAOFactor(vec2 uv) {
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vec3 centerColor = sampleBase(uv);
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float centerLum = luminance(centerColor);
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float occlusion = 0.0;
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vec2 directions[4] = vec2[](vec2(1.0, 0.0), vec2(-1.0, 0.0), vec2(0.0, 1.0), vec2(0.0, -1.0));
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for (int i = 0; i < 4; ++i) {
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vec2 sampleUv = uv + directions[i] * aoRadius;
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vec3 sampleColor = sampleBase(sampleUv);
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float sampleLum = luminance(sampleColor);
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occlusion += max(0.0, centerLum - sampleLum);
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}
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occlusion /= 4.0;
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return clamp(1.0 - occlusion * aoStrength, 0.0, 1.0);
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}
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void main() {
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vec3 color = sampleBase(TexCoord);
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if (enableChromatic) {
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color = applyChromatic(TexCoord);
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}
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if (enableAO) {
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color *= computeAOFactor(TexCoord);
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}
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if (enableVignette) {
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color *= computeVignette(TexCoord);
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}
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if (enableMotionBlur && hasHistory) {
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vec2 dir = TexCoord - vec2(0.5);
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float len = length(dir);
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dir = (len > 0.0001) ? dir / len : vec2(0.0);
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float smear = clamp(motionBlurStrength, 0.0, 0.98) * 0.035; // subtle default
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vec3 accum = vec3(0.0);
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float weightSum = 0.0;
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for (int i = 0; i < 3; ++i) {
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float t = (float(i) + 1.0) / 3.0;
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float w = 1.0 - t * 0.4;
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vec2 offsetUv = TexCoord - dir * smear * t;
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offsetUv = clamp(offsetUv, vec2(0.002), vec2(0.998));
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vec3 sampleCol = texture(historyTex, offsetUv).rgb;
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accum += sampleCol * w;
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weightSum += w;
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}
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vec3 history = (weightSum > 0.0) ? accum / weightSum : texture(historyTex, TexCoord).rgb;
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float diff = length(color - history);
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float motionWeight = smoothstep(0.01, 0.08, diff); // suppress blur when camera still
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float mixAmt = clamp(motionBlurStrength * 0.85, 0.0, 0.9) * motionWeight;
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if (mixAmt > 0.0001) {
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color = mix(color, history, mixAmt);
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}
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}
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if (enableBloom) {
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vec3 glow = texture(bloomTex, TexCoord).rgb * bloomIntensity;
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color += glow;
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}
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FragColor = vec4(color, 1.0);
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}
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