I'm attempting to create a Constant buffer in which to store the view, world and projection matrices..

i get E_INVALIDARG

ZeroMemory(&mBufferDesc, sizeof(mBufferDesc));
mBufferDesc.Usage = D3D11_USAGE_DEFAULT;
mBufferDesc.ByteWidth = sizeof(ConstantBuffer);
mBufferDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
mBufferDesc.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
HRESULT hr =eng->mDevice->CreateBuffer( &mBufferDesc, NULL, &mConstantBuffer );
	return 0;

any ideas? =/

mBufferDesc is declared as a member of the class where my code is:

D3D11_BUFFER_DESC mBufferDesc;

struct ConstantBuffer
{
XMMATRIX mWorld;
XMMATRIX mView;
XMMATRIX mProjection;
};

ok so i figured out i had to use D3D11_USAGE_DYNAMIC.... i don't know how my eyes missed it and i don't know how i wrote that since i was following directx official tutorials :/ but still it displays nothing...

but still it displays nothing...

That could be caused by a large number of reasons... What are you trying to render? Are you correctly filing the constant buffers and binding it to the right shader stage?

Have you tried to run your program in PIX (or NSight or GPU PerfStudio or Intel GPA) to check if the shader is running as expected (with the right values).?

I just started with DirectX recently (SharpDX) and I had problems getting the constant buffer working too.

Here is a snippet of my C# code which works. (remember tp update your buffer using UpdateSubResource - that is where I had the problem)

[StructLayout(LayoutKind.Sequential, Pack=4)]
struct cbTransform
{
public Matrix worldProj;
}

...
cbTransform m_cbTransform = new cbTransform();
Buffer m_transformBuf;
m_transformBuf = new Buffer(rc.Device, Utilities.SizeOf<cbTransform>(), ResourceUsage.Default, BindFlags.ConstantBuffer, CpuAccessFlags.None, ResourceOptionFlags.None, 0);
rc.Context.VertexShader.SetConstantBuffer(0, m_transformBuf);
...

m_cbTransform.worldProj = m_viewProj;

m_cbTransform.worldProj =

/*Matrix.RotationX(time) **/ Matrix.RotationY(time * 2)/* * Matrix.RotationZ(time * .7f)*/ * m_viewProj;

m_cbTransform.worldProj.Transpose();

rc.Context.UpdateSubresource<cbTransform>(ref m_cbTransform, m_transformBuf);

nevermind solved.... apparently i had a return 0; at some point in my code... that i really have no clues why it was there... so no error returns but the code won't work..... i must be tired.. thanks anyway