Thanks again,

Yeah, I have debug device enabled and surprisingly no errors / warnings at all (I have seen a few of those today - LOL)

I just made the view and world matrices 'identity' and I get a 1 pixel dot at bottom left of the screen (which is roughly what i'd expect due to the removal of scaling, except for bottom being zero and top being 640 - that seems to be upside down).

Not sure where to go from here though.

Here is my current code...

// Set up the view
XMMATRIX viewMatrix=XMMatrixIdentity();
XMMATRIX projMatrix=XMMatrixOrthographicOffCenterLH(0.0f,(float)width,0.0f,(float)height,0.0f,100.0f); // 800 x 600
viewMatrix=XMMatrixTranspose(viewMatrix);
projMatrix=XMMatrixTranspose(projMatrix);
 
// position the object
//XMMATRIX scaleMatrix=XMMatrixScaling(1.0f*256.0f,1.0f*256.0f,0.0f);
//XMMATRIX translationMatrix=XMMatrixTranslation(0.0f,0.0f,0.0f);
//XMMATRIX worldMat=scaleMatrix*translationMatrix
 
XMATRIX worldMat=XMMatrixIdentity(); 
 
d3dContext->UpdateSubresource(worldCB,0,0,&worldMat,0,0);
d3dContext->UpdateSubresource(viewCB,0,0,&viewMatrix,0,0);
d3dContext->UpdateSubresource(projCB,0,0,&projMatrix,0,0);
 
d3dContext->VSSetConstantBuffers(0,1,&worldCB);
d3dContext->VSSetConstantBuffers(1,1,&viewCB);
d3dContext->VSSetConstantBuffers(2,1,&projCB);

Ok, I made some decent progress. The code now works perfectly, except the fact that the y axis starts from the bottom of the screen and upwards is positive.

// Set up the view
XMMATRIX viewMatrix=XMMatrixIdentity();
XMMATRIX projMatrix=XMMatrixOrthographicOffCenterLH(0.0f,(float)width,0.0f,(float)height,0.0f,100.0f);		// 800 x 450
viewMatrix=XMMatrixTranspose(viewMatrix);
projMatrix=XMMatrixTranspose(projMatrix);

// position the object
XMMATRIX scaleMatrix=XMMatrixScaling(1.0f*128.0f,1.0f*128.0f,0.0f);  // This is correct for 256px sprite as verts are 1 to -1 (fix later)
XMMATRIX rotationMatrix=XMMatrixRotationZ(0.0f);
XMMATRIX translationMatrix=XMMatrixTranslation(0.0f,0.0f,0.0f);
XMMATRIX worldMat=scaleMatrix*rotationMatrix*translationMatrix;
worldMat=XMMatrixTranspose(worldMat);

d3dContext->UpdateSubresource(worldCB,0,0,&worldMat,0,0);
d3dContext->UpdateSubresource(viewCB,0,0,&viewMatrix,0,0);
d3dContext->UpdateSubresource(projCB,0,0,&projMatrix,0,0);

d3dContext->VSSetConstantBuffers(0,1,&worldCB);
d3dContext->VSSetConstantBuffers(1,1,&viewCB);
d3dContext->VSSetConstantBuffers(2,1,&projCB);

So, overall I am pretty happy as I had no clue on shaders and DX11 just 24 hours ago. If I can nail this last issue (the y axis upside down) I'll be extremely happy.

Thanks Jason.

I also got around it using this method as well

XMMATRIX translationMatrix=XMMatrixTranslation(128.0f,(float)height-128.0f,0.0f);

(float)height being the height of the window. Just seemed a little hacky though as all of the documentation I can find says that 0,0 should be top-left of the screen.

At least I have a working solution though.

But, on the bright side. I came here yesterday with a blank window and now I have a working camera system, so I am glad I persisted with the shader method rather than persisting with dynamic vertex buffers. In the end, I know it was a far better method to go this way

Thanks for all of the help and guidance along the way too.

No doubt, I'll be posting in a weeks time asking how to do pixel perfect collisions (I am shuddering allready - LOL).