offset texture rendering

Effects/DeferredPBR_GBufferEffect.cs

@@ -16,6 +16,9 @@ namespace Kav
         EffectParameter metallicParam;
         EffectParameter roughnessParam;
 
+        EffectParameter numTextureRowsParam;
+        EffectParameter numTextureColumnsParam;
+
         EffectParameter vertexShaderIndexParam;
         EffectParameter shaderIndexParam;
 
@@ -27,6 +30,9 @@ namespace Kav
         float metallic;
         float roughness;
 
+        int numTextureRows = 1;
+        int numTextureColumns = 1;
+
         bool albedoTextureEnabled = false;
         bool metallicRoughnessMapEnabled = false;
         bool normalMapEnabled = false;
@@ -127,6 +133,26 @@ namespace Kav
             }
         }
 
+        public int NumTextureRows
+        {
+            get { return numTextureRows; }
+            set
+            {
+                numTextureRows = value;
+                numTextureRowsParam.SetValue(numTextureRows);
+            }
+        }
+
+        public int NumTextureColumns
+        {
+            get { return numTextureColumns; }
+            set
+            {
+                numTextureColumns = value;
+                numTextureColumnsParam.SetValue(numTextureColumns);
+            }
+        }
+
         public bool HardwareInstancingEnabled
         {
             get { return hardwareInstancingEnabled; }
@@ -248,6 +274,9 @@ namespace Kav
             metallicParam = Parameters["MetallicValue"];
             roughnessParam = Parameters["RoughnessValue"];
 
+            numTextureRowsParam = Parameters["NumTextureRows"];
+            numTextureColumnsParam = Parameters["NumTextureColumns"];
+
             shaderIndexParam = Parameters["PixelShaderIndex"];
             vertexShaderIndexParam = Parameters["VertexShaderIndex"];
         }

Effects/HLSL/DeferredPBR_GBufferEffect.fx

@@ -10,6 +10,9 @@ BEGIN_CONSTANTS
     float MetallicValue                        _ps(c1)    _cb(c1);
     float RoughnessValue                       _ps(c2)    _cb(c2);
 
+    int NumTextureRows              _vs(c9)               _cb(c3);
+    int NumTextureColumns           _vs(c10)              _cb(c4);
+
 MATRIX_CONSTANTS
 
     float4x4 World                  _vs(c0)               _cb(c7);
@@ -56,8 +59,11 @@ PixelInput main_vs(VertexInput input)
     return output;
 }
 
-PixelInput instanced_vs(VertexInput input, float3 Translation : TEXCOORD2)
+PixelInput instanced_vs(
-{
+    VertexInput input, 
+    float3 Translation : TEXCOORD2,
+    float2 UVOffset    : TEXCOORD5
+) {
     PixelInput output;
 
     float4x4 world = float4x4(
@@ -71,7 +77,11 @@ PixelInput instanced_vs(VertexInput input, float3 Translation : TEXCOORD2)
 
     output.PositionWorld = mul(input.Position, world);
     output.NormalWorld = mul(input.Normal, world);
-    output.TexCoord = input.TexCoord;
+
+    float2 texCoord;
+    texCoord.x = (input.TexCoord.x / NumTextureColumns + UVOffset.x);
+    texCoord.y = (input.TexCoord.y / NumTextureRows + UVOffset.y);
+    output.TexCoord = texCoord;
 
     output.Position = mul(input.Position, worldViewProjection);
 

Geometry/Interfaces/IGBufferDrawable.cs

@@ -12,5 +12,8 @@ namespace Kav
         Texture2D AlbedoTexture { get; }
         Texture2D NormalTexture { get; }
         Texture2D MetallicRoughnessTexture { get; }
+
+        int NumTextureRows { get; }
+        int NumTextureColumns { get; }
     }
 }

Geometry/MeshPart.cs

@@ -38,6 +38,9 @@ namespace Kav
         public float Metallic { get; set; } = 0.5f;
         public float Roughness { get; set; } = 0.5f;
 
+        public int NumTextureRows { get; set; } = 1;
+        public int NumTextureColumns { get; set; } = 1;
+
         public bool DisableAlbedoMap { get; set; } = false;
         public bool DisableNormalMap { get; set; } = false;
         public bool DisableMetallicRoughnessMap { get; set; } = false;

Renderer.cs

@@ -63,14 +63,15 @@ namespace Kav
             );
         }
 
-        public static (PositionInstanceVertex[], DynamicVertexBuffer) CreatePositionVertexBuffer(
+        public static (T[], DynamicVertexBuffer) CreateInstanceVertexBuffer<T>(
             GraphicsDevice graphicsDevice,
             int instanceVertexCount
-        ) {
+        ) where T : IVertexType {
-            var positionData = new PositionInstanceVertex[instanceVertexCount];
+            var positionData = new T[instanceVertexCount];
+
             var vertexBuffer = new DynamicVertexBuffer(
                 graphicsDevice,
-                VertexDeclarations.PositionInstanceDeclaration,
+                typeof(T),
                 instanceVertexCount,
                 BufferUsage.WriteOnly
             );
@@ -257,31 +258,6 @@ namespace Kav
             }
         }
 
-        public static int FillInstanceVertexBuffer<V>(
-            IEnumerable<Matrix> transforms,
-            V[] vertexData,
-            DynamicVertexBuffer dynamicVertexBuffer
-        ) where V : struct, IVertexType, IHasTranslation
-        {
-            int numInstances = 0;
-            foreach (var transform in transforms)
-            {
-                vertexData[numInstances].Translation = transform.Translation;
-                numInstances += 1;
-            }
-
-            if (numInstances == 0) { return 0; }
-
-            dynamicVertexBuffer.SetData(
-                vertexData,
-                0,
-                numInstances,
-                SetDataOptions.Discard
-            );
-
-            return numInstances;
-        }
-
         public static void RenderInstanced<T>(
             GraphicsDevice graphicsDevice,
             T drawable,
@@ -391,6 +367,9 @@ namespace Kav
             Deferred_GBufferEffect.Metallic = drawable.Metallic;
             Deferred_GBufferEffect.Roughness = drawable.Roughness;
 
+            Deferred_GBufferEffect.NumTextureRows = drawable.NumTextureRows;
+            Deferred_GBufferEffect.NumTextureColumns = drawable.NumTextureColumns;
+
             Deferred_GBufferEffect.AlbedoTexture = drawable.AlbedoTexture;
             Deferred_GBufferEffect.NormalTexture = drawable.NormalTexture;
             Deferred_GBufferEffect.MetallicRoughnessTexture = drawable.MetallicRoughnessTexture;

VertexDeclarations.cs

@@ -8,5 +8,11 @@ namespace Kav
         (
             new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.TextureCoordinate, 2)
         );
+
+        public static VertexDeclaration PositionTextureOffsetInstanceDeclaration = new VertexDeclaration
+        (
+            new VertexElement(0, VertexElementFormat.Vector3, VertexElementUsage.TextureCoordinate, 2),
+            new VertexElement(12, VertexElementFormat.Vector2, VertexElementUsage.TextureCoordinate, 5)
+        );
     }
 }

Vertices/PositionTextureOffsetInstanceVertex.cs

@@ -5,24 +5,27 @@ using Microsoft.Xna.Framework.Graphics;
 namespace Kav
 {
     [StructLayout(LayoutKind.Sequential, Pack = 1)]
-    public struct PositionInstanceVertex : IVertexType, IHasTranslation
+    public struct PositionTextureOffsetInstanceVertex : IVertexType
     {
         VertexDeclaration IVertexType.VertexDeclaration
         {
             get
             {
-                return VertexDeclarations.PositionInstanceDeclaration;
+                return VertexDeclarations.PositionTextureOffsetInstanceDeclaration;
             }
         }
 
         public Vector3 Translation { get; set; }
+        public Vector2 UVOffset { get; set; }
 
         public static readonly VertexDeclaration VertexDeclaration;
 
-        public PositionInstanceVertex(
+        public PositionTextureOffsetInstanceVertex(
-            Vector3 translation
+            Vector3 translation,
+            Vector2 uvOffset
         ) {
             Translation = translation;
+            UVOffset = uvOffset;
         }
     }
 }