draw with vertex index and color constant buffer

PracticeDx/PixelShader.hlsl

-float4 main(float3 color : Color) : SV_Target
+cbuffer CBuf
 {
-	return float4(color, 1.0f);
-}
+	float4 face_color[6];
+};
+
+//float4 main( float3 color : Color) : SV_Target
+float4 main(uint tid: SV_PrimitiveID) : SV_Target
+{
+	//return float4(color, 1.0f);
+	return face_color[tid / 2];
+}
\ No newline at end of file

PracticeDx/PracticeDx.vcxproj

@@ -138,6 +138,8 @@
       <ShaderType Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Pixel</ShaderType>
       <ObjectFileOutput Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">$(ProjectDir)%(Filename).cso</ObjectFileOutput>
       <ObjectFileOutput Condition="'$(Configuration)|$(Platform)'=='Release|x64'">$(ProjectDir)%(Filename).cso</ObjectFileOutput>
+      <ShaderModel Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">4.0</ShaderModel>
+      <ShaderModel Condition="'$(Configuration)|$(Platform)'=='Release|x64'">4.0</ShaderModel>
     </FxCompile>
     <FxCompile Include="VertexShader.hlsl">
       <ShaderType Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">Vertex</ShaderType>

PracticeDx/VertexShader.hlsl

-struct VSOut
-{
-	float3 color : Color;
-	float4 pos : SV_Position;
-};
-
 cbuffer CBuf
 {
 	matrix transform;
 };
 
-VSOut main(float3 pos : Position, float3 color : Color)
+float4 main(float3 pos : Position): SV_Position
 {
-	VSOut vso;
-	vso.pos = mul(float4(pos, 1.0f), transform);
-	vso.color = color;
-
-	return vso;
+	return mul(float4(pos, 1.0f), transform);
 }
\ No newline at end of file

PracticeDx/WinMain.cpp

@@ -114,6 +114,32 @@ ConstantBuffer cb =
     )
 };
 
+// Define color constant buffer
+Microsoft::WRL::ComPtr<ID3D11Buffer> pColorConstantBuffer;
+// Create constant buffer for color
+struct ColorConstantBuffer
+{
+    struct
+    {
+        float r;
+        float g;
+        float b;
+        float a;
+    } face_colors[6];
+};
+
+const ColorConstantBuffer ccb =
+{
+    {
+        { 1.0f, 0.0f, 1.0f },
+        { 1.0f, 0.0f, 0.0f },
+        { 0.0f, 1.0f, 0.0f },
+        { 0.0f, 0.0f, 1.0f },
+        { 1.0f, 1.0f, 0.0f },
+        { 0.0f, 1.0f, 1.0f },
+    }
+};
+
 // Define input layout
 ID3D11InputLayout* pInputLayout;
 
@@ -206,6 +232,24 @@ void DefineConstantBuffer(float angle)
     devcon->VSSetConstantBuffers(0u, 1u, pConstantBuffer.GetAddressOf());
 }
 
+void DefineColorConstantBuffer()
+{
+    D3D11_BUFFER_DESC ccbd = {};
+    ccbd.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
+    ccbd.Usage = D3D11_USAGE_DEFAULT;
+    ccbd.CPUAccessFlags = 0u;
+    ccbd.MiscFlags = 0u;
+    ccbd.ByteWidth = sizeof(ccb);
+    ccbd.StructureByteStride = 0u;
+    D3D11_SUBRESOURCE_DATA ccsd = {};
+    ccsd.pSysMem = &ccb;
+
+    dev->CreateBuffer(&ccbd, &ccsd, &pColorConstantBuffer);
+
+    // Bind constant buffer to vertex
+    devcon->PSSetConstantBuffers(0u, 1u, pColorConstantBuffer.GetAddressOf());
+}
+
 void DefineInputLayout()
 {
     // Create input elements description, choosing whatever need to send to GPU
@@ -214,7 +258,7 @@ void DefineInputLayout()
         //{ "Position",0,DXGI_FORMAT_R32G32_FLOAT,0,0,D3D11_INPUT_PER_VERTEX_DATA,0 },
         { "Position",0,DXGI_FORMAT_R32G32B32_FLOAT,0,0,D3D11_INPUT_PER_VERTEX_DATA,0 },
         //{ "Color",0,DXGI_FORMAT_R32G32B32_FLOAT,0,8,D3D11_INPUT_PER_VERTEX_DATA,0 },
-        { "Color",0,DXGI_FORMAT_R32G32B32_FLOAT,0,12,D3D11_INPUT_PER_VERTEX_DATA,0 },
+        //{ "Color",0,DXGI_FORMAT_R32G32B32_FLOAT,0,12,D3D11_INPUT_PER_VERTEX_DATA,0 },
     };
 
     // Create input layout, using the description Defined above
@@ -257,6 +301,7 @@ void drawTriangle()
     DefineVertexBuffer();
     DefineIndexBuffer();
     DefineConstantBuffer(timer.Peek());
+    DefineColorConstantBuffer();
     DefineInputLayout();
     DrawPrimitive();
 }