Texture Combiner/Grass Updates

Runtime/Colors/ColorX.cs

@@ -4,6 +4,8 @@ namespace Rokojori
 {  
   public static class ColorX 
   {
+    
+
     public static float AlphaMultipliedR( this Color c )
     {
       return c.R * c.A;
@@ -19,20 +21,103 @@ namespace Rokojori
       return c.B * c.A;
     } 
 
+    public static float pmR( this Color c ) => c.AlphaMultipliedR();
+    public static float pmG( this Color c ) => c.AlphaMultipliedG();
+    public static float pmB( this Color c ) => c.AlphaMultipliedB();
+    
+    static float Clamp( float f )
+    {
+      return MathX.Clamp01( f ); 
+    }
+
     public static Color Blend( Color bottom, Color top )
     {
       var fade = ( 1f - top.A );
-      var a0 = top.A + bottom.A * fade;
+      var a = top.A + bottom.A * fade;
 
-      var xR = top.AlphaMultipliedR() + bottom.AlphaMultipliedR() * fade;
-      var xG = top.AlphaMultipliedG() + bottom.AlphaMultipliedG() * fade;
-      var xB = top.AlphaMultipliedB() + bottom.AlphaMultipliedB() * fade;
+      var r = top.pmR() + bottom.pmR() * fade;
+      var g = top.pmG() + bottom.pmG() * fade;
+      var b = top.pmB() + bottom.pmB() * fade;
       
-      var normalizer = 1f / a0;
-
-      return new Color( xR, xG, xB, 1 ) * normalizer;
+      return new Color( r, g, b, 1 ) / a;
     }
 
+    public static Color PreMultipliedSingleComponentBlendMode( Color bottom, Color top, System.Func<float,float,float, float> blending )
+    {
+      var fade = ( 1f - top.A );
+      var a = top.A + bottom.A * fade;
+
+      var r = blending( bottom.pmR(), top.pmR(), fade );
+      var g = blending( bottom.pmG(), top.pmG(), fade );
+      var b = blending( bottom.pmB(), top.pmB(), fade );
+      
+      return new Color( r, g, b, 1 ) / a;
+    }
+
+    
+
+    public static Color BlendMultiply( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( a, b, f)=>
+      {
+        return a * b;
+      }
+      );
+    }
+
+    public static Color BlendScreen( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( a, b, f)=>
+      {
+        return 1f - ( 1f - a ) * ( 1f - b);
+      }
+      );
+    }
+
+    public static Color BlendOverlay( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( a, b, f)=>
+      {
+        return a < 0.5f ? (2.0f * a * b) : (1.0f - 2.0f * (1.0f - a) * (1.0f - b)); 
+      }
+      );
+    }
+
+    public static Color BlendHardLight( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( a, b, f)=>
+      {
+        return b < 0.5f ? (2.0f * a * b) : (1.0f - 2.0f * (1.0f - a) * (1.0f - b)) ; 
+      }
+      );
+    }
+
+    public static Color BlendSoftLight( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( a, b, f)=>
+      {
+        return b < 0.5f ? (2.0f * a * b) : (1.0f - 2.0f * (1.0f - a) * (1.0f - b)) ; 
+      }
+      );
+    }
+
+    public static Color BlendAdd( Color bottom, Color top )
+    {
+      return PreMultipliedSingleComponentBlendMode( bottom, top, 
+      ( b, t, f)=>
+      {
+        return b + t;
+      }
+      );
+    }
+
+    
+
     public static Color Lerp( Color a, Color b, float amount )
     {
       return a.Lerp( b, amount ); 

Runtime/Procedural/Assets/Grass/GrassPatch.cs

@@ -133,6 +133,9 @@ namespace Rokojori
     [Export]
     public Curve rolling = MathX.Curve( 0f );
 
+    [Export]
+    public Curve rolling2 = null;
+
 
     [ExportGroup( "Blade Offset & Scale")]
 
@@ -619,11 +622,18 @@ namespace Rokojori
 
       outputSpline.AutoOrientateByTangents( Vector3.Back );
 
+      var rollingMix = random.Next();
+
+      var otherRolling = rolling2 == null ? rolling : rolling2;
+
       for ( int i = 0; i < outputPoints.Count - 1; i++ )
       {
         var t = i / (float)( outputPoints.Count - 2 );
         var rotation  = rolling.Sample( t );
-        RollSpline( outputPoints, i, rotation );
+        var rotation2 = otherRolling.Sample( t );
+        var mixedRotation = Mathf.Lerp( rotation, rotation2, rollingMix );
+
+        RollSpline( outputPoints, i, mixedRotation );
       }
 
       var modifier = new SplinesDeformModifier();

Runtime/Procedural/Assets/Grass/Windy Grass Shader.gdshader

@@ -53,8 +53,9 @@ void vertex()
   float strength = texture( windNoise, windUV + windNoiseStrengthOffset ).r * windStrength;
   vec2 circle = onCircle( angle ) * strength;
   VERTEX = worldToLocal( worldVertex + vec3( circle.x, 0, circle.y ) * windAmount, MODEL_MATRIX );
-  VERTEX.y = mix( VERTEX.y, max( 0, VERTEX.y - strength * windAmount), windHeightCompensation * 2.0f );
-  
+  float minY = min( VERTEX.y, 0 );
+  // VERTEX.y = mix( VERTEX.y, max( 0, VERTEX.y - strength * windAmount), windHeightCompensation * 2.0f );
+  VERTEX.y = mix( VERTEX.y, max( minY, VERTEX.y - strength * windAmount), windHeightCompensation * 4.0f );
 }
 
 void fragment() 

Runtime/Procedural/Textures/TextureCombiner/Layers/TextureCombinerTextureLayer.cs

@@ -0,0 +1,61 @@
+using System.Collections;
+using System.Collections.Generic;
+using Godot;
+using System;
+using System.Threading;
+using System.Threading.Tasks;
+
+
+namespace Rokojori
+{
+  [Tool]
+  [GlobalClass]
+  public partial class TextureCombinerTextureLayer:TextureCombinerLayer
+  {
+    [Export]
+    public Texture2D texture;
+
+    [Export]
+    public Vector2 tiling = Vector2.One;
+
+    [Export]
+    public Vector2 offset = Vector2.Zero;
+
+    [Export]
+    public bool updateTexture;
+
+    TextureCombinerBuffer textureBuffer;
+
+    public override async Task Process( TextureCombinerProcessingRect processingRect )
+    {
+      var time = Async.StartTimer();
+
+      if ( updateTexture || textureBuffer == null )
+      {
+        textureBuffer = TextureCombinerBuffer.From( texture );
+
+        time = await Async.WaitIfExceeded( time );
+      }
+      
+
+      for ( int i = 0; i < processingRect.processingWidth; i++ )
+      {
+        for ( int j = 0; j < processingRect.processingHeight; j++ )
+        {
+          var uv    = processingRect.GetRelativeUV( i, j );
+
+          uv *= tiling;
+          uv += offset;
+
+          uv = uv.PosMod( 1f );
+          
+          var color = textureBuffer.SampleBilinearUV( uv );
+
+          processingRect.SetOutputRelative( i, j, color );
+        }
+      }
+
+      return;
+    }
+  }
+}

Runtime/Procedural/Textures/TextureCombiner/TextureCombiner.cs

@@ -2,7 +2,8 @@ using System.Collections;
 using System.Collections.Generic;
 using Godot;
 using System;
-
+using System.Threading;
+using System.Threading.Tasks;
 
 
 namespace Rokojori
@@ -12,6 +13,199 @@ namespace Rokojori
   public partial class TextureCombiner:Resource
   {
     [Export]
-    public TextureCombinerLayer[] layers;
+    public Texture2D textureOutput;
+
+    [Export]
+    public bool createMipmaps = true;
+
+    [Export]
+    public TextureCombinerMaterialOutput materialOutput;
+
+    [Export]
+    public bool create 
+    {
+      get => false;
+      set { if ( ! value ) return; CreateTexture(); }
+    }
+    
+
+    [Export]
+    public TextureCombinerStack layerStack;
+
+    [Export]
+    public int width = 1024;
+    
+    [Export]
+    public int height = 1024;
+
+    [ExportGroup( "Processing Settings")]
+    [Export]
+    bool _creatingTexture = false;
+
+    [Export]
+    int _blockSize = 512;
+
+    async void CreateTexture()
+    {
+      if ( _creatingTexture )
+      {
+        return;
+      }
+
+      var hRatio = width / (float)height;
+      var waitImage = Image.CreateEmpty( 32, Mathf.Max( 1, Mathf.RoundToInt( 32 / hRatio ) ), false, Image.Format.Rgba8 );
+      waitImage.Fill( new Color( 1, 0, 1 ));
+
+      textureOutput = ImageTexture.CreateFromImage( waitImage );
+
+
+      _creatingTexture = true;
+
+      var context = new TextureCombinerContext();
+      context.combiner = this;
+      context.imageWidth = width;
+      context.imageHeight = height;
+
+      outputBuffer = TextureCombinerBuffer.Create( width, height ); 
+      inputBuffer  = TextureCombinerBuffer.Create( width, height ); 
+
+      var first = true;
+
+      for ( int i = 0; i < layerStack.layers.Length; i++ )
+      {
+        var layerIndex = ( layerStack.layers.Length - 1 ) - i;
+        var layer = layerStack.layers[ layerIndex ];
+
+        if ( ! layer.visible )
+        {
+          continue;
+        }
+
+        await ProcessLayer( layer, context );
+
+        if ( first )
+        {
+          var b = inputBuffer;
+          inputBuffer = outputBuffer;
+          outputBuffer = b;
+          
+          first = false;
+        }
+        else
+        {
+          await BlendLayer( layer, context );
+        }
+        
+      }
+      
+      var image = Image.CreateEmpty( width, height, createMipmaps, Image.Format.Rgba8 );
+      inputBuffer.CopyTo( 0, 0, 0, 0, width, height, image );
+      image.GenerateMipmaps();
+
+      textureOutput = ImageTexture.CreateFromImage( image );
+     
+      if ( materialOutput != null && 
+           materialOutput.material != null &&
+           materialOutput.textureName != null
+      )
+      {
+        materialOutput.textureName.Set( materialOutput.material, textureOutput );
+      }
+
+      _creatingTexture = false;
+    }
+
+    async Task ProcessLayer( TextureCombinerLayer layer, TextureCombinerContext context )
+    {
+      var blockSize = _blockSize;
+      var blocksX = Mathf.CeilToInt( width / (float) blockSize );
+      var blocksY = Mathf.CeilToInt( height / (float) blockSize );
+      
+      var time = Async.StartTimer();
+
+      for ( int i = 0; i < blocksX; i++ )
+      {
+        var startX = i * blockSize;
+        var endX   = Mathf.Min( startX + blockSize, width );
+
+        for ( int j = 0; j < blocksY; j++ )
+        {
+          var startY = j * blockSize;
+          var endY   = Mathf.Min( startY + blockSize, height );
+
+          var rect = new TextureCombinerProcessingRect();
+      
+          rect.processingX = startX;
+          rect.processingY = startY;
+          rect.processingWidth = endX - startX;
+          rect.processingHeight = endY - startY;
+          rect.context = context; 
+          rect.inputBuffer = inputBuffer;
+          rect.outputBuffer = outputBuffer;
+
+          await layer.Process( rect );
+
+          time = await Async.WaitIfExceeded( time );
+            
+        }
+      }
+    }
+
+    async Task BlendLayer( TextureCombinerLayer layer, TextureCombinerContext context )
+    {
+      var blockSize = _blockSize;
+      var blocksX = Mathf.CeilToInt( width / (float) blockSize );
+      var blocksY = Mathf.CeilToInt( height / (float) blockSize );
+
+      var time = Async.StartTimer();
+
+      TextureCombinerBuffer maskBuffer = null;
+
+      if ( layer.opacityMask != null )
+      {
+        maskBuffer = TextureCombinerBuffer.From( layer.opacityMask ).Resize( context.imageWidth, context.imageHeight );      
+      }
+
+      for ( int i = 0; i < blocksX; i++ )
+      {
+        var startX = i * blockSize;
+        var endX   = Mathf.Min( startX + blockSize, width );
+
+        for ( int j = 0; j < blocksY; j++ )
+        {
+          var startY = j * blockSize;
+          var endY   = Mathf.Min( startY + blockSize, width );
+
+          var rect = new TextureCombinerProcessingRect();
+
+          if ( layer.opacityMask == null )
+          {
+            TextureCombinerBlendModeAlgorithm.Blend( layer.blendMode, 
+              startX, startY, endX - startX, endY - startY, layer.opacity,
+              inputBuffer, outputBuffer, inputBuffer 
+            );
+          }
+          else
+          {
+             TextureCombinerBlendModeAlgorithm.BlendMasked( layer.blendMode, 
+              startX, startY, endX - startX, endY - startY, layer.opacity, maskBuffer,
+              inputBuffer, outputBuffer, inputBuffer 
+            );
+          }
+         
+
+          time = await Async.WaitIfExceeded( time );
+            
+        }
+      }
+    }
+
+
+    TextureCombinerBuffer outputBuffer;
+    TextureCombinerBuffer inputBuffer;
+
+   
+
+
   }
 }

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerBlendMode.cs

@@ -11,23 +11,53 @@ namespace Rokojori
   {
     Normal,
     Add,
-    Multiply
+    Multiply,
+    Screen,
+    Overlay,
+    HardLight,
+    SoftLight
   }
 
   public class TextureCombinerBlendModeAlgorithm
   {
     public static void Blend( TextureCombinerBlendMode blendMode, int x, int y, int w, int h, float topOpacity,
-      TextureBuffer<Color> bottom, TextureBuffer<Color> top, TextureBuffer<Color> output
+      TextureCombinerBuffer bottom, TextureCombinerBuffer top, TextureCombinerBuffer output
     )
     {
       if ( TextureCombinerBlendMode.Normal == blendMode )
       {
-        BlendNormal( x, y, w, h, topOpacity, bottom, top, output );
+        BlendMode( ColorX.Blend, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Add == blendMode )
+      {
+        BlendMode( ColorX.BlendAdd, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Multiply == blendMode )
+      {
+        BlendMode( ColorX.BlendMultiply, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Screen == blendMode )
+      {
+        BlendMode( ColorX.BlendScreen, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Overlay == blendMode )
+      {
+        BlendMode( ColorX.BlendOverlay, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.HardLight == blendMode )
+      {
+        BlendMode( ColorX.BlendHardLight, x, y, w, h, topOpacity, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.SoftLight == blendMode )
+      {
+        BlendMode( ColorX.BlendSoftLight, x, y, w, h, topOpacity, bottom, top, output );
       }
     }
 
-    static void BlendNormal( int x, int y, int w, int h, float topOpacity,
-      TextureBuffer<Color> bottom, TextureBuffer<Color> top, TextureBuffer<Color> output )
+    
+
+    static void BlendMode( System.Func<Color,Color,Color> blender, int x, int y, int w, int h, float topOpacity,
+      TextureCombinerBuffer bottom, TextureCombinerBuffer top, TextureCombinerBuffer output )
     {
       for ( int i = 0; i < w; i++ )
       {
@@ -39,10 +69,78 @@ namespace Rokojori
 
          var index        = output.ComputeIndexFromPosition( rx, ry );
 
-          var topColor    = top.GetIndexed( index ).FadeAlpha( topOpacity );
+          var topColor    = top.GetIndexed( index );
           var bottomColor = bottom.GetIndexed( index );
 
-          var outputColor = bottomColor.Blend( topColor );
+
+          var outputColor = blender( bottomColor, topColor );
+          
+          outputColor = bottomColor.Blend( outputColor.FadeAlpha( topOpacity ) );
+
+          output.SetIndexed( index, outputColor );
+
+        }
+      }
+    }
+
+    public static void BlendMasked( TextureCombinerBlendMode blendMode, int x, int y, int w, int h, float topOpacity,
+    TextureCombinerBuffer mask, 
+      TextureCombinerBuffer bottom, TextureCombinerBuffer top, TextureCombinerBuffer output
+    )
+    {
+      if ( TextureCombinerBlendMode.Normal == blendMode )
+      {
+        BlendModeMasked( ColorX.Blend, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Add == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendAdd, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Multiply == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendMultiply, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Screen == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendScreen, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.Overlay == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendOverlay, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.HardLight == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendHardLight, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+      else if ( TextureCombinerBlendMode.SoftLight == blendMode )
+      {
+        BlendModeMasked( ColorX.BlendSoftLight, x, y, w, h, topOpacity, mask, bottom, top, output );
+      }
+    }
+
+    static void BlendModeMasked( System.Func<Color,Color,Color> blender, int x, int y, int w, int h, float topOpacity, 
+    TextureCombinerBuffer mask,
+      TextureCombinerBuffer bottom, TextureCombinerBuffer top, TextureCombinerBuffer output )
+    {
+      for ( int i = 0; i < w; i++ )
+      {
+        var rx = x + i;
+
+        for ( int j = 0; j < h; j++ )
+        {
+          var ry = y + j;
+
+          var index        = output.ComputeIndexFromPosition( rx, ry );
+
+          var topColor    = top.GetIndexed( index );
+          var bottomColor = bottom.GetIndexed( index );
+
+
+          var outputColor = blender( bottomColor, topColor );
+
+          var maskOpacity = mask.GetIndexed( index );          
+          
+          outputColor = bottomColor.Blend( outputColor.FadeAlpha( topOpacity * maskOpacity.R ) );
 
           output.SetIndexed( index, outputColor );
 

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerBuffer.cs

@@ -7,7 +7,7 @@ using System;
 
 namespace Rokojori
 {
-  public class TextureBuffer<T>
+  public class TextureCombinerBuffer
   {
     int _width;
     public int width => _width;
@@ -15,43 +15,150 @@ namespace Rokojori
     int _height;
     public int height => _height;
 
-    T[] _pixels;    
+    Color[] _pixels;    
 
-    public static TextureBuffer<T> Create( int w, int h )
+    public static TextureCombinerBuffer Create( int w, int h )
     {
-      var tb = new TextureBuffer<T>();
+      var tb = new TextureCombinerBuffer();
       tb._height = h;
       tb._width = w;
-      tb._pixels = new T[ w * h ];
+      tb._pixels = new Color[ w * h ];
 
       return tb;
     }
 
+    public static TextureCombinerBuffer From( Texture2D texture )
+    {
+      var buffer = Create( texture.GetWidth(), texture.GetHeight() );
+      buffer.CopyFrom( texture.GetImage(), 0, 0, 0, 0, texture.GetWidth(), texture.GetHeight() );
+
+      return buffer;
+    }
+
+    public TextureCombinerBuffer Resize( int w, int h )
+    {
+      var buffer = Create( w, h );
+
+      for ( int i = 0; i < w; i++ )
+      {
+        for ( int j = 0; j < h; j++ )
+        {
+          var uv = new Vector2( i / (float) w, j / (float) h );
+          var pixel = SampleBilinearUV( uv );
+
+          buffer.SetAt( i, j, pixel );
+        }
+      }
+
+      return buffer;
+
+      }
+
+    public void CopyFrom( Image image, int sourceX, int sourceY, int ownX, int ownY, int w, int h )
+    {
+      for ( int i = 0; i < w; i++ )
+      {
+        for ( int j = 0; j < h; j++ )
+        {
+          var sourcePixel = image.GetPixel( sourceX + i, sourceY + j );
+
+          SetAt( ownX + i, ownY + j, sourcePixel );
+
+        }
+      }
+    }
+
+
+    public void CopyTo( int ownX, int ownY, int targetX, int targetY, int w, int h, TextureCombinerBuffer output )
+    {
+      for ( int i = 0; i < w; i++ )
+      {
+        for ( int j = 0; j < h; j++ )
+        {
+          var ownPixel = GetAt( ownX + i, ownY + j );
+
+          output.SetAt( targetX + i, targetY + j, ownPixel );
+
+        }
+      }
+    }
+
+    public void CopyTo( int ownX, int ownY, int targetX, int targetY, int w, int h, Image image )
+    {
+      for ( int i = 0; i < w; i++ )
+      {
+        for ( int j = 0; j < h; j++ )
+        {
+          var ownPixel = GetAt( ownX + i, ownY + j );
+          image.SetPixel( targetX + i, targetY + j, ownPixel );
+
+        }
+      }
+    }
+
     public int ComputeIndexFromPosition( int x, int y )
     {
       return x + y * _width;
     }
 
-    public void SetAt( int x, int y, T value )
+    public void SetAt( int x, int y, Color value )
     {
       SetIndexed( ComputeIndexFromPosition( x, y ), value );
     }
     
-    public void SetIndexed( int index, T value )
+    public void SetIndexed( int index, Color value )
     {
       _pixels[ index ] = value;
     }
 
-    public T GetAt( int x, int y )
+    public Color GetAt( int x, int y )
     {
       return GetIndexed( ComputeIndexFromPosition( x, y ) );
     }
 
-    public T GetIndexed( int index )
+    public Color GetIndexed( int index )
     {
       return _pixels[ index ];
     } 
 
+    public Color SampleNearestUV( Vector2 uv )
+    {
+      return SampleNearestImage( uv.X * width, uv.Y * height );
+    }
 
+    public Color SampleNearestImage( float imageDimensionsX, float imageDimensionsY )
+    {
+      return GetAt( Mathf.RoundToInt( imageDimensionsX ), Mathf.RoundToInt( imageDimensionsY ) ); 
+    }    
+
+    public Color SampleBilinearUV( Vector2 uv )
+    {
+      return SampleBilinearImage( uv.X * width, uv.Y * height );
+    }
+
+    public Color SampleBilinearImage( float imageDimensionsX, float imageDimensionsY )
+    {
+      var lowX  = Mathf.FloorToInt( imageDimensionsX );
+      var highX = Mathf.Min( lowX + 1, width - 1 );
+      var lerpX = imageDimensionsX - lowX;
+
+      
+    
+      var lowY  = Mathf.FloorToInt( imageDimensionsY );
+      var highY = Mathf.Min( lowY + 1, height - 1 );
+      var lerpY = imageDimensionsY - lowY;
+
+
+      var ll = GetAt( lowX, lowY );
+      var hl = GetAt( highX, lowY );
+
+      var lh = GetAt( lowX, highY );
+      var hh = GetAt( highX, highY );
+
+      var upper = ll.Lerp( hl, lerpX );
+      var lower = lh.Lerp( hh, lerpX );
+
+      return upper.Lerp( lower, lerpY ); 
+    }
   }
 }

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerLayer.cs

@@ -19,7 +19,13 @@ namespace Rokojori
     [Export( PropertyHint.Range, "0,1")]
     public float opacity = 1;
 
-    public async Task Process( TextureCombinerProcessingRect processingRect )
+    [Export]
+    public Texture2D opacityMask;
+
+    [Export]
+    public bool visible = true;
+    
+    public virtual async Task Process( TextureCombinerProcessingRect processingRect )
     {
       return;
     }

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerMaterialOutput.cs

@@ -0,0 +1,21 @@
+using System.Collections;
+using System.Collections.Generic;
+using Godot;
+using System;
+
+
+
+namespace Rokojori
+{
+  [Tool]
+  [GlobalClass]
+  public partial class TextureCombinerMaterialOutput:Resource
+  {
+    [Export]
+    public Material material;
+
+    [Export]
+    public Texture2DPropertyName textureName;
+
+  }
+}

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerProcessingRect.cs

@@ -2,7 +2,8 @@ using System.Collections;
 using System.Collections.Generic;
 using Godot;
 using System;
-
+using System.Threading;
+using System.Threading.Tasks;
 
 
 namespace Rokojori
@@ -12,10 +13,41 @@ namespace Rokojori
     public TextureCombinerContext context;
     public int processingX = 0;
     public int processingY = 0;
-    public int processingWidht = 0;
+    public int processingWidth = 0;
     public int processingHeight = 0;
 
-    public TextureBuffer<Color> output;
+
+    public Vector2 GetUV( int x, int y )
+    {
+      return new Vector2( x / (float) context.imageWidth, y / (float) context.imageHeight );
+    }
+
+    public Vector2 GetRelativeUV( int x, int y )
+    {
+      return GetUV( x + processingX, y + processingY );
+    }
+
+    public void SetOutputRelative( int x, int y, Color c )
+    {
+      outputBuffer.SetAt( x + processingX, y + processingY, c );
+    } 
+
+
+    public Vector2 uvStart => GetUV( processingX, processingY );
+    public Vector2 uvEnd   => GetUV( processingX + processingWidth, processingY + processingHeight );
+
+    public TextureCombinerBuffer inputBuffer;
+    public TextureCombinerBuffer outputBuffer;
+    
+
+    public async Task CopyToFinalOutput( TextureCombinerBuffer bottomBuffer, TextureCombinerBuffer image )
+    {
+      var time = Async.StartTimer();
+      bottomBuffer.CopyTo( 0, 0, processingX, processingY, processingWidth, processingHeight, image );
+      time = await Async.WaitIfExceeded( time );
+
+      return; 
+    }
 
   }
 }

Runtime/Procedural/Textures/TextureCombiner/TextureCombinerStack.cs

@@ -0,0 +1,17 @@
+using System.Collections;
+using System.Collections.Generic;
+using Godot;
+using System;
+
+
+
+namespace Rokojori
+{
+  [Tool]
+  [GlobalClass]
+  public partial class TextureCombinerStack:Resource
+  {    
+    [Export]
+    public TextureCombinerLayer[] layers;
+  }
+}

Runtime/Tools/Async.cs

@@ -0,0 +1,56 @@
+using System.Collections;
+using System.Collections.Generic;
+using System.Text;
+using System;
+using Godot;
+
+using System;
+using System.Threading.Tasks;
+
+namespace Rokojori
+{
+  
+  public class Async
+  {
+    public const double waitTime = 1.0 / 60.0;
+
+    public static async Task Wait( double waitTime = Async.waitTime )
+    {
+      await Task.Delay( (int)( waitTime * 1000 ) );
+      return;
+    }
+
+    public static double StartTimer()
+    {
+      return Time.GetTicksMsec() / 1000.0;
+    }
+
+    public static async Task<double> WaitIfExceeded( double last, double waitTime = Async.waitTime )
+    {
+      var now = Time.GetTicksMsec() / 1000.0;
+
+      if ( ( now - last ) > waitTime )
+      {
+        await Task.Delay( (int)( waitTime * 1000 ) );
+
+        return Time.GetTicksMsec() / 1000.0;;
+      }
+
+      return last;
+    }
+
+    public static double DoIfExceeded( double last, System.Action action, double waitTime = Async.waitTime )
+    {
+      var now = Time.GetTicksMsec() / 1000.0;
+
+      if ( ( now - last ) > waitTime )
+      {
+        action();
+      }
+
+
+      return Time.GetTicksMsec() / 1000.0;;
+    }
+  }
+
+}