add multiple triangles with color

StudyDx/Graphics.cpp

@@ -108,17 +108,33 @@ void Graphics::DrawTestTriangle()
 	HRESULT hr;
 
 	struct Vertex
+	{
+		struct
 		{
 			float x;
 			float y;
+		} pos;
+		struct
+		{
+			float r;
+			float g;
+			float b;
+		} color;
 	};
 
 	// 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
+		{ -0.3f, 0.3f, 0.0f, 1.0f, 0.0f },
+		// right top
+		{ 0.3f, 0.3f, 0.0f, 0.0f, 1.0f },
+		// center bottom
+		{ 0.0f, -0.8f, 1.0f, 0.0f, 0.0f },
 	};
 	wrl::ComPtr<ID3D11Buffer> pVertexBuffer;
 	D3D11_BUFFER_DESC bd = {};
@@ -137,6 +153,29 @@ void Graphics::DrawTestTriangle()
 	const UINT offset = 0u;
 	pContext->IASetVertexBuffers(0u, 1u, pVertexBuffer.GetAddressOf(), &stride, &offset);
 
+	// Create index buffer
+	const unsigned short indices[] =
+	{
+		0, 1, 2,
+		0, 2, 3,
+		0, 4, 1,
+		2, 1, 5,
+	};
+	wrl::ComPtr<ID3D11Buffer> pIndexBuffer;
+	D3D11_BUFFER_DESC ibd = {};
+	ibd.BindFlags = D3D11_BIND_INDEX_BUFFER;
+	ibd.Usage = D3D11_USAGE_DEFAULT;
+	ibd.CPUAccessFlags = 0u;
+	ibd.MiscFlags = 0u;
+	ibd.ByteWidth = sizeof(indices);
+	ibd.StructureByteStride = sizeof(unsigned short);
+	D3D11_SUBRESOURCE_DATA isd = {};
+	isd.pSysMem = indices;
+	GFX_THROW_INFO(pDevice->CreateBuffer(&ibd, &isd, &pIndexBuffer));
+
+	// Bind index buffer to pipeline
+	pContext->IASetIndexBuffer(pIndexBuffer.Get(), DXGI_FORMAT_R16_UINT, 0u);
+
 	// create pixel shader
 	wrl::ComPtr<ID3D11PixelShader> pPixelShader;
 	wrl::ComPtr<ID3DBlob> pBlob;
@@ -160,6 +199,7 @@ void Graphics::DrawTestTriangle()
 	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 },
 	};
 	GFX_THROW_INFO(pDevice->CreateInputLayout(
 		ied, (UINT)std::size(ied),
@@ -188,7 +228,8 @@ void Graphics::DrawTestTriangle()
 	pContext->RSSetViewports(1u, &vp);
 
 
-	GFX_THROW_INFO_ONLY(pContext->Draw((UINT)std::size(vertices), 0u));
+	//GFX_THROW_INFO_ONLY(pContext->Draw((UINT)std::size(vertices), 0u));
+	GFX_THROW_INFO_ONLY(pContext->DrawIndexed((UINT)std::size(indices), 0u, 0u));
 }
 
 // Graphics exception stuff

StudyDx/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);
 }
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StudyDx/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;
 }
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