add drawing multiple triangles with color

PracticeDx/PixelShader.hlsl

-float4 main() : SV_TARGET
+float4 main(float3 color : Color) : SV_Target
 {
-	return float4(1.0f, 1.0f, 1.0f, 1.0f);
+	return float4(color, 1.0f);
 }

PracticeDx/VertexShader.hlsl

-float4 main(float2 pos : POSITION) : SV_POSITION
+struct VSOut
 {
-	return float4(pos.x, pos.y, 0.0f, 1.0f);
+	float3 color : Color;
+	float4 pos : SV_Position;
+};
+
+VSOut main(float2 pos : Position, float3 color : Color)
+{
+	VSOut vso;
+	vso.pos = float4(pos.x, pos.y, 0.0f, 1.0f);
+	vso.color = color;
+
+	return vso;
 }

PracticeDx/WinMain.cpp

@@ -10,6 +10,8 @@
 
 #include <wrl.h>
 
+#include <array>    // to usd std::size
+
 // global declarations
 Microsoft::WRL::ComPtr<IDXGISwapChain>          swapchain;          // the pointer to the swap chain interface
 Microsoft::WRL::ComPtr<ID3D11Device>            dev;                // the pointer to our Direct3D device interface
@@ -31,13 +33,35 @@ struct Vertex
 {
     float x;
     float y;
+
+    float r;
+    float g;
+    float b;
 };
 // create vertex buffer (1 2d triangle at center of screen)
 const Vertex vertices[] =
 {
-    { -0.0f,0.5f },
-    { 0.5f,-0.5f },
-    { -0.5f,-0.5f },
+    // center
+    { 0.0f, 0.5f, 1.0f, 0.0f, 0.0f },
+    { 0.5f, -0.5f, 0.0f, 1.0f, 0.0f },
+    { -0.5f, -0.5f, 0.0f, 0.0f, 1.0f },
+
+    // left top
+    { 0.0f, 0.5f, 1.0f, 0.0f, 0.0f },
+    { -0.5f, -0.5f, 0.0f, 0.0f, 1.0f },
+    { -0.3f, 0.3f, 0.0f, 1.0f, 0.0f },
+
+
+    // right top
+    { 0.5f, -0.5f, 0.0f, 1.0f, 0.0f },
+    { 0.0f, 0.5f, 1.0f, 0.0f, 0.0f },
+    { 0.3f, 0.3f, 0.0f, 0.0f, 1.0f },
+
+    // center bottom
+    { 0.5f, -0.5f, 0.0f, 1.0f, 0.0f },
+    { 0.0f, -0.8f, 1.0f, 0.0f, 0.0f },
+    { -0.5f, -0.5f, 0.0f, 0.0f, 1.0f },
+
 };
 
 // Define input layout
@@ -82,12 +106,13 @@ void DefineInputLayout()
     const D3D11_INPUT_ELEMENT_DESC ied[] =
     {
         { "Position",0,DXGI_FORMAT_R32G32_FLOAT,0,0,D3D11_INPUT_PER_VERTEX_DATA,0 },
+        { "Color",0,DXGI_FORMAT_R32G32B32_FLOAT,0,8,D3D11_INPUT_PER_VERTEX_DATA,0 },
     };
 
     // Create input layout, using the description Defined above
     dev->CreateInputLayout
     (
-        ied, 1, //(UINT)std::size(ied),
+        ied, (UINT)std::size(ied),
         pCompiledVertexBlob->GetBufferPointer(),
         pCompiledVertexBlob->GetBufferSize(),
         &pInputLayout