static public void GetGersterWavesDescription(ref GersterWavesDescription Description, Material WaterMaterial)
{
Description.intensity = WaterMaterial.GetVector("_GerstnerVertexIntensity");
Description.steepness = WaterMaterial.GetVector("_GSteepness");
Description.amp = WaterMaterial.GetVector("_GAmplitude");
Description.freq = WaterMaterial.GetVector("_GFinalFrequency");
Description.speed = WaterMaterial.GetVector("_GFinalSpeed");
Description.dirAB = WaterMaterial.GetVector("_GDirectionAB");
Description.dirCD = WaterMaterial.GetVector("_GDirectionCD");
}
// [MethodImpl(MethodImplOptions.AggressiveInlining)]
static public Vector3 GetGestnerDisplacement(
Vector3 WorldPosition,
GersterWavesDescription Description,
float TimeOffset
)
{
Vector2 xzVtx;
xzVtx.x = WorldPosition.x;
xzVtx.y = WorldPosition.z;
Vector4 AB;
Vector4 CD;
// half4 AB = steepness.xxyy * amp.xxyy * dirAB.xyzw;
AB.x = Description.steepness.x * Description.amp.x * Description.dirAB.x;
AB.y = Description.steepness.x * Description.amp.x * Description.dirAB.y;
AB.z = Description.steepness.y * Description.amp.y * Description.dirAB.z;
AB.w = Description.steepness.y * Description.amp.y * Description.dirAB.w;
// half4 CD = steepness.zzww * amp.zzww * dirCD.xyzw;
CD.x = Description.steepness.z * Description.amp.z * Description.dirCD.x;
CD.y = Description.steepness.z * Description.amp.z * Description.dirCD.y;
CD.z = Description.steepness.w * Description.amp.w * Description.dirCD.z;
CD.w = Description.steepness.w * Description.amp.w * Description.dirCD.w;
// half4 dotABCD = freq.xyzw * half4(dot(dirAB.xy, xzVtx), dot(dirAB.zw, xzVtx), dot(dirCD.xy, xzVtx), dot(dirCD.zw, xzVtx));
Vector4 dotABCD;
dotABCD.x = Description.freq.x * (Description.dirAB.x * xzVtx.x + Description.dirAB.y * xzVtx.y);
dotABCD.y = Description.freq.y * (Description.dirAB.z * xzVtx.x + Description.dirAB.w * xzVtx.y);
dotABCD.z = Description.freq.z * (Description.dirCD.x * xzVtx.x + Description.dirCD.y * xzVtx.y);
dotABCD.w = Description.freq.w * (Description.dirCD.z * xzVtx.x + Description.dirCD.w * xzVtx.y);
Vector4 TIME;
// In case we do not use underwater rendering
float time = Time.timeSinceLevelLoad + TimeOffset; // Shader.GetGlobalVector("_Time").y + TimeOffset ; //Time.time; //timeSinceLevelLoad; //.time
// half4 TIME = _Time.yyyy * speed;
TIME.x = time * Description.speed.x;
TIME.y = time * Description.speed.y;
TIME.z = time * Description.speed.z;
TIME.w = time * Description.speed.w;
Vector4 COS;
// half4 COS = cos (dotABCD + TIME);
dotABCD.x += TIME.x;
dotABCD.y += TIME.y;
dotABCD.z += TIME.z;
dotABCD.w += TIME.w;
COS.x = (float)Math.Cos(dotABCD.x);
COS.y = (float)Math.Cos(dotABCD.y);
COS.z = (float)Math.Cos(dotABCD.z);
COS.w = (float)Math.Cos(dotABCD.w);
Vector4 SIN;
// half4 SIN = sin (dotABCD + TIME);
SIN.x = (float)Math.Sin(dotABCD.x);
SIN.y = (float)Math.Sin(dotABCD.y);
SIN.z = (float)Math.Sin(dotABCD.z);
SIN.w = (float)Math.Sin(dotABCD.w);
Vector3 offsets;
// offsets.x = dot(COS, half4(AB.xz, CD.xz));
offsets.x = (COS.x * AB.x + COS.y * AB.z + COS.z * CD.x + COS.w * CD.z) * Description.intensity.x;
// offsets.z = dot(COS, half4(AB.yw, CD.yw));
offsets.z = (COS.x * AB.y + COS.y * AB.w + COS.z * CD.y + COS.w * CD.w) * Description.intensity.z;
// offsets.y = dot(SIN, amp);
offsets.y = (SIN.x * Description.amp.x + SIN.y * Description.amp.y + SIN.z * Description.amp.z + SIN.w * Description.amp.w) * Description.intensity.y;
return(offsets);
}