Initial commit: Minecraft 光追着色器包（从零实现的 path tracing）

shaders/Lib/Programs/Composite/TAA.glsl

@@ -0,0 +1,46 @@
+// MinecraftPT — TAA
+// Temporal anti-aliasing with jittered accumulation and neighborhood clamping.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+#include "/Lib/BasicFunctions/TemporalNoise.glsl"
+
+uniform sampler2D colortex12; // HDR scene (current)
+uniform sampler2D colortex13; // previous frame HDR
+
+layout(location = 0) out vec4 colorOut;
+layout(location = 1) out vec4 historyOut; // same result, stored for next frame
+
+void main(){
+	vec2 texelCoord = gl_FragCoord.xy;
+
+	vec3 current = texelFetch(colortex12, ivec2(texelCoord), 0).rgb;
+
+	// Motion vector
+	vec2 motion = texelFetch(colortex10, ivec2(texelCoord * 0.5), 0).xy * 2.0;
+	vec2 prevCoord = texelCoord + motion;
+
+	// Sample previous
+	vec3 history = textureLod(colortex13, prevCoord / screenSize, 0.0).rgb;
+
+	// Neighborhood clamp
+	vec3 minColor = history;
+	vec3 maxColor = history;
+	for (int i = -1; i <= 1; i++){
+	for (int j = -1; j <= 1; j++){
+		vec3 c = textureLod(colortex13, (prevCoord + vec2(i, j)) / screenSize, 0.0).rgb;
+		minColor = min(minColor, c);
+		maxColor = max(maxColor, c);
+	}}
+	history = clamp(history, minColor, maxColor);
+
+	// Subpixel sharpening
+	float sharpening = TAA_SUBPIXEL_SHARPNING;
+	current = current + (current - history) * sharpening * TAA_AGGRESSION;
+
+	float blend = TAA_BLENDWEIGHT;
+	vec3 color = mix(current, history, blend);
+
+	colorOut = vec4(color, 1.0);
+	historyOut = vec4(color, 1.0);
+}