Hi Guys,

I am currently trying to add color to my D3D11_INPUT_ELEMENT_DESC.

So far I have been using plain vertex buffers and the shader itself has been coloring the models to a single color.

I have created an D3D11_INPUT_ELEMENT_DESC

D3D11_INPUT_ELEMENT_DESC vertexLayout[] =
{
	{ "POSITION", 0 ,DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
	{ "COLOR", 0, DXGI_FORMAT_R32G32B32A32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0 }
};

and have created the geometry as a custom Float7 array. First 3 floats are the XYZ co-ordinates and the last 4 float are the RGBA values.

Here is the code I am using for a simple quad.

	vertex_data[0] = { -0.5f, -0.5f, 0.0f,		255.0f, 0.0f, 0.0f, 255.0f };
	vertex_data[1] = { -0.5f, 0.5f, 0.0f, 		0.0f, 255.0f, 0.0f, 255.0f };
	vertex_data[2] = { 0.5f, -0.5f, 0.0f,		0.0f, 0.0f, 255.0f, 255.0f };
	vertex_data[3] = { 0.5f, -0.5f, 0.0f,		0.0f, 0.0f, 255.0f, 255.0f };
	vertex_data[4] = { -0.5f, 0.5f, 0.0f,		0.0f, 255.0f, 0.0f, 255.0f };
	vertex_data[5] = { 0.5f, 0.5f, 0.0f,		255.0f, 0.0f, 0.0f, 255.0f };


	D3D11_BUFFER_DESC vertexDesc;
	ZeroMemory(&vertexDesc, sizeof(vertexDesc));
	vertexDesc.Usage = D3D11_USAGE_DEFAULT;
	vertexDesc.BindFlags = D3D11_BIND_VERTEX_BUFFER;
	vertexDesc.ByteWidth = sizeof(Float7) * nVerts;

	D3D11_SUBRESOURCE_DATA resourceData;
	ZeroMemory(&resourceData, sizeof(resourceData));
	resourceData.pSysMem = vertex_data;
	
	result = d3dDevice->CreateBuffer(&vertexDesc, &resourceData, &d3dVertexBuffer);

And this is how I am rendering the quad

		unsigned int stride = sizeof(Float7);
		unsigned int offset = 0;
		d3dContext->IASetInputLayout(d3dInputLayout);
		d3dContext->IASetVertexBuffers(0, 1, &d3dVertexBuffer, &stride, &offset);
		d3dContext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
		d3dContext->Draw(nVerts, 0);    // nVerts = 6...

The problem is that the geometry is rendering correctly but the coloring is incorrect.

It is rendering as a white box with an aqua line running where the triangles intersect to make up the quad.

I'd expect to be seeing more of a rainbow type of effect where each corner graduates between the primary colors.

Been tearing my hear out for a few hours and can't seem to see where I am going wrong.

Any advice would be awesome

Genious! Worked instantly.

Thank you for the detailed explanation. That makes a lot of sense now