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

shaders/Lib/IndividualFunctions/WaterWaves.glsl

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+// MinecraftPT — Water Waves
+// Gerstner-style water wave normals with multi-octave detail.
+
+#ifndef WATER_WAVES_GLSL
+#define WATER_WAVES_GLSL
+
+vec3 GetWaveNormal(vec3 worldPos, float lightmap){
+	vec2 pos = worldPos.xz;
+
+	float time = frameTimeCounter * 0.05 * WAVE_SPEED;
+
+	// Multi-octave sine waves
+	float wave1 = sin(pos.x * 0.1 * WAVE_SCALE + time) * cos(pos.y * 0.08 * WAVE_SCALE + time * 0.7);
+	float wave2 = sin(pos.x * 0.2 * WAVE_SCALE + time * 1.3) * cos(pos.y * 0.15 * WAVE_SCALE - time * 0.9);
+	float wave3 = sin((pos.x + pos.y) * 0.35 * WAVE_SCALE + time * 1.7) * 0.5;
+
+	// Height field derivatives for normal
+	float dx = cos(pos.x * 0.1 * WAVE_SCALE + time) * 0.1 * WAVE_SCALE * 0.5 * 0.05
+		+ cos(pos.x * 0.2 * WAVE_SCALE + time * 1.3) * 0.2 * WAVE_SCALE * 0.5 * 0.04;
+	float dz = -sin(pos.x * 0.1 * WAVE_SCALE + time) * sin(pos.y * 0.08 * WAVE_SCALE + time * 0.7) * 0.08 * WAVE_SCALE * 0.5 * 0.05
+		- sin(pos.x * 0.2 * WAVE_SCALE + time * 1.3) * sin(pos.y * 0.15 * WAVE_SCALE - time * 0.9) * 0.15 * WAVE_SCALE * 0.5 * 0.04;
+
+	vec3 normal = normalize(vec3(-dx, 1.0, -dz) * WAVE_NORMAL_STRENGTH + vec3(0.0, 1.0 - WAVE_NORMAL_STRENGTH, 0.0));
+
+	return normal;
+}
+
+#endif