Release v0.9.6

Editor/Internal Data/Third Party/Shaders/Layers/Clamp.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+float2 ClampRange;
+
+// Kernel
+[numthreads(32,1,1)]
+void Clamp (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < HeightMapLength){ // Keep in bounds
+        // Update texture
+        HeightBuffer[id.x] = clamp(HeightBuffer[id.x], ClampRange.x, ClampRange.y);
+    }
+}
+

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Editor/Internal Data/Third Party/Shaders/Layers/Expand.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+float2 ExpanderMinMax;
+
+// Kernel
+[numthreads(32,1,1)]
+void Expand (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < HeightMapLength){ // Keep in bounds
+        // Expand height
+        HeightBuffer[id.x] = clamp((HeightBuffer[id.x] - ExpanderMinMax.x) / ExpanderMinMax.y, 0, 1);
+    }
+}

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Editor/Internal Data/Third Party/Shaders/Layers/HeightContrast.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+float HeightContrastPow;
+
+// Kernel
+[numthreads(32,1,1)]
+void HeightContrast (uint3 id : SV_DispatchThreadID)
+{
+    // Expand height
+    HeightBuffer[id.x] = clamp(pow(abs(HeightBuffer[id.x] + 0.5), HeightContrastPow) - 0.5, 0, 1);
+}

Editor/Internal Data/Third Party/Shaders/Layers/HeightContrast.hlsl.meta

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Editor/Internal Data/Third Party/Shaders/Layers/HeightMapToTexture.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Kernel
+[numthreads(32,32,1)]
+void HeightMapToTexture (uint3 id : SV_DispatchThreadID)
+{
+    // Get width and height of texture
+    int w,h;
+    Texture.GetDimensions(w,h);
+    
+    // Calculate position relative to heightmap
+    float2 relativeID = RelativizeVector(id.x, id.y, w, h);
+    float2 heightMapPos = float2(relativeID.x * HeightMapResolution, relativeID.y * HeightMapResolution);
+    
+    // Calculate height
+    float3 gradient = CalculateGradientAndHeight(heightMapPos, HeightMapResolution, HeightBuffer); 
+    
+    // Set height
+    
+    Texture[id.xy] = float4(gradient.z,gradient.z,gradient.z,1);
+}

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Editor/Internal Data/Third Party/Shaders/Layers/HydraulicErosion.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+uint ErosionParticleCount;
+uint ErosionMaxLifeTime;
+float ErosionInertia;
+float ErosionParticleStartSpeed;
+float ErosionParticleStartWater;
+float ErosionSedimentCapacityFactor;
+float ErosionMinSedimentCapacity;
+float ErosionSpeed;
+float ErosionEvaporateSpeed;
+float ErosionGravity;
+float ErosionDepositSpeed;
+
+// Kernel
+[numthreads(32,1,1)]
+void HydraulicErosion (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < ErosionParticleCount){ // Keep in bounds
+        float randomNormalizedX = Random(id.x);
+        float randomNormalizedY = Random(id.x + HeightMapResolution * randomNormalizedX);
+        
+        float2 pos = float2(
+            randomNormalizedX * HeightMapResolution,
+            randomNormalizedY * HeightMapResolution
+        );
+        
+        // Particle values
+        float2 dir = float2(0,0);
+        float speed = ErosionParticleStartSpeed;
+        float water = ErosionParticleStartWater;
+        float sediment = 0;
+    
+        for(uint lifeTime = 0; lifeTime < ErosionMaxLifeTime; lifeTime++){
+            // Calculate texture coords
+            uint2 coord = uint2(
+                (uint) pos.x,
+                (uint) pos.y
+            );
+            
+            int index = PosToIndex(coord, HeightMapResolution);
+            
+            // Calculate cell offset
+            float2 cellOffset = float2(
+                pos.x - float(coord.x),
+                pos.y - float(coord.y)
+            );
+            
+            // Calculate interpolated gradient and height
+            float3 heightAndGradient = CalculateGradientAndHeight(pos, HeightMapResolution, HeightBuffer);
+            
+            // Update the droplet's direction and position (move position 1 unit regardless of speed)
+            dir.x = (dir.x * ErosionInertia - heightAndGradient.x * (1 - ErosionInertia));
+            dir.y = (dir.y * ErosionInertia - heightAndGradient.y * (1 - ErosionInertia));
+                 
+            // Normalize dir
+            dir = Normalize2D(dir);
+            
+            // Add to position
+            pos += dir;
+            
+            // Header guard to check wheter particle is still inside texture and moving
+            if((dir.x == 0 && dir.y == 0) || pos.x <= 0 || pos.y <= 0 || pos.x >= float(HeightMapResolution - 2) || pos.y >= float(HeightMapResolution - 2)){ break; }
+            
+            // Calculate new height and deltaHeight
+            float height = CalculateGradientAndHeight(pos, HeightMapResolution, HeightBuffer).z;
+            float deltaHeight = height - heightAndGradient.z;
+            
+            // Calculate the droplet's sediment capacity (higher when moving fast down a slope and contains lots of water)
+            float sedimentCapacity = max(-deltaHeight, ErosionMinSedimentCapacity) * speed * water * ErosionSedimentCapacityFactor;
+            
+            // If carrying more sediment than capacity, or if flowing uphill:
+            if (sediment > sedimentCapacity || deltaHeight > 0) {
+                // If moving uphill (deltaHeight > 0) try fill up to the current height, otherwise deposit a fraction of the excess sediment
+                float amountToDeposit = (deltaHeight > 0) ? 
+                    min(deltaHeight, sediment) :
+                    (sediment - sedimentCapacity) * ErosionDepositSpeed;
+                
+                // Remove deposited sediment
+                sediment -= amountToDeposit;
+                
+                // Add the sediment to the four nodes of the current cell using bilinear interpolation
+                 AddToBuffer(index, HeightMapResolution, cellOffset, amountToDeposit, HeightBuffer);
+            }
+            else {
+                // Erode a fraction of the droplet's current carry capacity.
+                // Clamp the erosion to the change in height so that it doesn't dig a hole in the terrain behind the droplet
+                float amountToErode = min((sedimentCapacity - sediment) * ErosionSpeed, -deltaHeight);
+                
+                // Remove erosion amount from heightmap
+                AddToBuffer(index, HeightMapResolution, cellOffset, -amountToErode, HeightBuffer);
+                
+                // Add eroded amount to sediment currently carried
+                sediment += amountToErode;
+            }
+    
+            // Update droplet's speed and water content
+            speed = sqrt (max(0,speed * speed + deltaHeight * ErosionGravity));
+            water *= (1 - ErosionEvaporateSpeed);
+        }
+    }
+}

Editor/Internal Data/Third Party/Shaders/Layers/HydraulicErosion.hlsl.meta

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Editor/Internal Data/Third Party/Shaders/Layers/PerlinNoise.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+uint PerlinType;
+float PerlinAmplitude;
+float PerlinFrequency;
+float2 PerlinOffset;
+uint PerlinOctaves;
+float PerlinOctavesStrength;
+
+// Methods
+float StandardPerlinNoise(uint id, float amplitude, float2 offset){
+    // Calculate vector
+    float2 pos = IndexToFloatVector(id, HeightMapResolution);
+    
+    // Calculate x and y position
+    float x = float(pos.x) / HeightMapResolution;
+    float y = float(pos.y) / HeightMapResolution;
+    
+    // Generate noise
+    return cnoise(float2(x * amplitude + offset.x, y * amplitude + offset.y));
+}
+
+float BillowyPerlinNoise(uint id, float amplitude, float2 offset){
+    float noise = StandardPerlinNoise(id, amplitude, offset);
+    return abs(noise * 2 - 1);
+}
+
+float RigidPerlinNoise(uint id, float amplitude, float2 offset){
+    return 1 - BillowyPerlinNoise(id, amplitude, offset);;
+}
+
+// Kernel
+[numthreads(32,1,1)]
+void PerlinNoise (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < HeightMapLength){ // Keep in bounds
+        float total = 0;
+        float frequency = PerlinFrequency;
+        float amplitude = 1;
+        float maxvalue = 0;
+        
+        for(uint i = 0; i < PerlinOctaves; i++){
+        
+            // Types
+            if(PerlinType == 0){ // Standard
+                total += StandardPerlinNoise(id.x, frequency, PerlinOffset) * amplitude;
+            } else if(PerlinType == 1){ // Billowy
+                total += BillowyPerlinNoise(id.x, frequency, PerlinOffset) * amplitude;
+            } else if(PerlinType == 2){ // Rigid
+                total += RigidPerlinNoise(id.x, frequency, PerlinOffset) * amplitude;
+            }
+            
+            maxvalue += amplitude;
+            amplitude *= PerlinOctavesStrength;
+            frequency *= 2;
+        }
+        
+        // Update buffer
+        HeightBuffer[id.x] = total/maxvalue;
+    }
+}

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Editor/Internal Data/Third Party/Shaders/Layers/PseudoRandomNoise.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+uint PseudoRandomNoiseSeed;
+
+// Kernel
+[numthreads(32,1,1)]
+void PseudoRandomNoise (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < HeightMapLength){ // Keep in bounds
+        // Calculate vector
+        uint2 pos = IndexToVector(id.x, HeightMapResolution);
+        
+        // Generate noise
+        float noise = Random((pos.x + (pos.y * HeightMapResolution)) * PseudoRandomNoiseSeed);
+        
+        // Update buffer
+        HeightBuffer[id.x] = noise;
+    }
+}

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Editor/Internal Data/Third Party/Shaders/Layers/Terrace.hlsl

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+// Licensed under the Non-Profit Open Software License version 3.0
+
+// Variables
+uint TerraceCount;
+float TerraceShape;
+bool Smooth;
+
+// Kernel
+[numthreads(1024,1,1)]
+void Terrace (uint3 id : SV_DispatchThreadID)
+{
+    if(id.x < HeightMapLength){ // Keep in bounds
+        float height = HeightBuffer[id.x] * TerraceCount; // Calculate height inside the terrace range
+        uint heightFloor = uint(height); // Floor the height
+        float difference = height - heightFloor; // Difference between height and floor. Normalized terrace
+        
+        if(Smooth){ // Should the terraces be smooth or sharp. Changes what part of the sigmoid is used
+            difference = (NormalisedSigmoid(difference * 2 - 1, TerraceShape) + 1) / 2;
+        } else {
+            difference = NormalisedSigmoid(difference, TerraceShape);
+        }
+        
+        // Calculate floor and ceil of terrace
+        float floor = float(heightFloor) / TerraceCount;
+        float ceil = float(heightFloor + 1) / TerraceCount;
+        
+        // Update buffer
+        HeightBuffer[id.x] = lerp(floor, ceil, difference);
+    }
+}

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