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

shaders/Lib/Programs/Composite/Bloom_FS.glsl

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+// MinecraftPT — Bloom_FS
+// Final bloom composite onto the scene.
+// bloomB is a fixed 1024x1024 image; the valid bloom region for this screen
+// is its top-left (viewWidth/4 x viewHeight/4) texels, so UV = screen / 4096.
+
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+
+uniform sampler2D colortex12;
+uniform sampler2D bloomB;
+
+layout(location = 0) out vec4 colorOut;
+
+void main(){
+	vec2 texelCoord = gl_FragCoord.xy;
+
+	vec3 scene = texelFetch(colortex12, ivec2(texelCoord), 0).rgb;
+	vec3 bloom = textureLod(bloomB, clamp(texelCoord / 4096.0, vec2(0.0), vec2(1.0)), 0.0).rgb;
+
+	vec3 color = scene + bloom * BLOOM_AMOUNT;
+
+	colorOut = vec4(color, 1.0);
+}