备份CatanBuilding瘦身独立工程

LocalPackages/zzwater/shaders/libs/Waves.hlsl

@@ -0,0 +1,102 @@
+
+
+struct WaveInfo
+{
+	float3 position;
+	float3 normal;
+};
+
+float3 GerstnerOffset4(float2 xzVtx, float4 steepness, float4 amp, float4 freq, float4 speed, float4 dirAB, float4 dirCD)
+{
+	float3 offsets;
+
+	float4 AB = steepness.xxyy * dirAB.xyzw * amp.xxyy;
+	float4 CD = steepness.zzww * dirCD.xyzw * amp.zzww;
+
+	float4 dotABCD = freq.xyzw * float4(dot(dirAB.xy, xzVtx), dot(dirAB.zw, xzVtx), dot(dirCD.xy, xzVtx), dot(dirCD.zw, xzVtx));
+
+	float4 COS = cos(dotABCD + speed); float4 SIN = sin(dotABCD + speed);
+
+	offsets.x = dot(COS, float4(AB.xz, CD.xz));
+	offsets.z = dot(COS, float4(AB.yw, CD.yw));
+	offsets.y = dot(SIN, amp); //Remap to only positive values;
+
+	return offsets;
+}
+
+float3 GerstnerNormal4(float2 xzVtx, float4 amp, float4 freq, float4 speed, float4 dirAB, float4 dirCD)
+{
+	float3 nrml = float3(0, 2.0, 0);
+
+	float4 AB = freq.xxyy * amp.xxyy * dirAB.xyzw;
+	float4 CD = freq.zzww * amp.zzww * dirCD.xyzw;
+
+	float4 dotABCD = freq.xyzw * float4(dot(dirAB.xy, xzVtx), dot(dirAB.zw, xzVtx), dot(dirCD.xy, xzVtx), dot(dirCD.zw, xzVtx));
+
+	float4 COS = cos(dotABCD + speed);
+
+	nrml.x -= dot(COS, float4(AB.xz, CD.xz));
+	nrml.z -= dot(COS, float4(AB.yw, CD.yw));
+
+	nrml.xz *= _WaveNormalStr;
+	nrml = normalize(nrml);
+
+	return nrml;
+}
+
+void Gerstner(inout float3 offs, inout float3 nrml,
+	float2 position,
+	float4 amplitude, float4 frequency, float4 steepness,
+	float4 speed, float4 directionAB, float4 directionCD)
+{
+	offs += GerstnerOffset4(position, steepness, amplitude, frequency, speed, directionAB, directionCD);
+	nrml += GerstnerNormal4(position, amplitude, frequency, speed, directionAB, directionCD);
+}
+
+#define WAVE_COUNT _WaveCount
+#define MAX_WAVE_COUNT 5
+
+
+#define STEEPNESS_SCALE 0.01
+
+//v1.1.8+
+WaveInfo GetWaveInfo(float2 position, float2 time, float height, float mask, float fadeStart, float fadeEnd)
+{
+	WaveInfo waves = (WaveInfo)0;
+
+	float4 amp = float4(0.3, 0.35, 0.25, 0.25);
+	float4 freq = float4(1.3, 1.35, 1.25, 1.25) * (1-_WaveDistance) * 3.0;
+	const float4 speed = float4(1.2* time.x, 1.375* time.y, 1.1 * time.x, time.y) ; //Pre-multiplied with time
+	const float4 dir1 = float4(0.3, 0.85, 0.85, 0.25) * _WaveDirection;
+	const float4 dir2 = float4(0.1, 0.9, -0.5, -0.5) * _WaveDirection;
+	const float4 steepness = float4(12.0, 12.0, 12.0, 12.0) * _WaveSteepness * lerp(1.0, MAX_WAVE_COUNT, 1/WAVE_COUNT);
+
+	//Distance based scalar
+	float pixelDist = length(GetCurrentViewPosition().xz - position.xy);
+	float fadeFactor = saturate((fadeEnd - pixelDist ) / (fadeEnd-fadeStart));
+
+	for (uint i = 0; i <= WAVE_COUNT; i++)
+	{
+		float t = 1+((float)i / (float)WAVE_COUNT);
+		freq *= t;
+		amp *= fadeFactor;
+		
+		Gerstner(/*out*/ waves.position, /*out*/ waves.normal, position, amp, freq, steepness, speed, dir1, dir2);
+	}
+
+	waves.normal = normalize(waves.normal);
+	//Average
+	waves.position.y /= WAVE_COUNT;
+	//waves.normal.xz *= WAVE_COUNT;
+
+	waves.position.xz *= STEEPNESS_SCALE * height * mask;
+	waves.position.y *= height * mask;
+	
+	return waves;
+}
+
+//Depricated
+WaveInfo GetWaveInfo(float2 position, float2 time, float fadeStart, float fadeEnd)
+{
+	return GetWaveInfo(position, time, 1.0, 1.0, fadeStart, fadeEnd);
+}