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

shaders/Lib/IndividualFunctions/WavingPlants.glsl

@@ -0,0 +1,39 @@
+#include "/Lib/Settings.glsl"
+#include "/Lib/Utilities.glsl"
+// MinecraftPT — Waving Plants
+// Wind animation for grass, plants, leaves.
+
+#ifndef WAVING_PLANTS_GLSL
+#define WAVING_PLANTS_GLSL
+
+void WavingPlants(inout vec4 worldPos, float lightLevel){
+	float time = frameTimeCounter * 0.05 * WAVING_SPEED;
+
+	// Wind direction
+	vec2 wind = vec2(0.5, 0.3) * sin(time) + vec2(0.2);
+
+	// Amplitude by plant type
+	float amplitude = GRASS_AMPLITUDE;
+	#ifdef IS_LEAVES
+		amplitude = LEAVES_AMPLITUDE;
+	#endif
+
+	float dist = length(worldPos.xyz - gbufferModelViewInverse[3].xyz);
+	float fade = 1.0 - saturate(dist / WAVING_RANGE);
+
+	vec3 vertexPos = worldPos.xyz;
+
+	// Vertex-based wave
+	vec3 offset = vec3(wind * sin(vertexPos.x * 0.3 + vertexPos.z * 0.2 + time * 2.0), 0.0);
+	offset *= vertexPos.y * amplitude * fade;
+
+	// Random per-vertex jitter (height-based)
+	float heightFactor = vertexPos.y;
+	float noise = sin(vertexPos.x * 12.9898 + vertexPos.z * 78.233 + time) * 0.5 + 0.5;
+	offset.x += noise * amplitude * 0.5 * heightFactor * fade;
+	offset.z += noise * amplitude * 0.3 * heightFactor * fade;
+
+	worldPos.xyz += offset;
+}
+
+#endif