Refactored dx12 to use c++ versions of the api and not C + various tweaks (using antigravity + gemini)

Assets/source/RootConstants.hlsl

@@ -5,7 +5,12 @@ cbuffer RootConstants : register(b0, space0)
 {
     row_major float4x4 ViewProjection;
     uint     BufferIndex;
-    uint     _Padding[3]; 
+    uint     TextureIndex; 
+    uint     VertexOffset; // Base vertex for indexed drawing with bindless buffers
+    uint     _Padding;     // Padding for alignment
+    float2   Scale;        // 2D scale factor
+    float2   Translate;    // 2D translation
 };
 
+
 #endif // ROOT_CONSTANTS_HLSL

Assets/source/Triangle.vert.hlsl

@@ -11,9 +11,8 @@ Output main(uint vertexIndex : SV_VertexID)
     Output output;
 
     // Retrieve the buffer using SM6.6 bindless syntax
-    // We use index 0 as the sample app doesn't pass push constants yet.
-    uint bufferIndex = 0;
-    ByteAddressBuffer buffer = ResourceDescriptorHeap[bufferIndex];
+    // Use BufferIndex from RootConstants (pushed via SetPushConstants)
+    ByteAddressBuffer buffer = ResourceDescriptorHeap[BufferIndex];
 
     // Read position from buffer (Index * stride)
     // Stride = 2 float (pos) + 4 float (color) = 6 * 4 = 24 bytes ?