Introduction to Vertex Shaders - Introduction to 3D Game Programming with DirectX 9.0 - page 306

// Compute projection matrix.
D3DXMatrixPerspectiveFovLH(
&Proj, D3DX_PI * 0.25f,
(float)Width / (float)Height, 1.0f, 1000.0f);
return true;
}
The Display function is quite simple. It tests for user input and
updates the view matrix accordingly. However, because we perform the
view matrix transformation in the shader, we must also update the view
matrix variable within the shader. We do this using the constant table:
bool Display(float timeDelta)
{
if( Device )
{
//
// Update view matrix code snipped...
//
D3DXMATRIX V;
D3DXMatrixLookAtLH(&V, &position, &target, &up);
DiffuseConstTable->SetMatrix(Device, ViewMatrixHandle, &V);
D3DXMATRIX ViewProj=V*Proj;
DiffuseConstTable->SetMatrix(Device, ViewProjMatrixHandle,
&ViewProj);
//
// Render
//
Device->Clear(0, 0, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
0xffffffff, 1.0f, 0);
Device->BeginScene();
Device->SetVertexShader(DiffuseShader);
Teapot->DrawSubset(0);
Device->EndScene();
Device->Present(0, 0, 0, 0);
}
return true;
}
Also observe that we enable the vertex shader that we wish to use
right before the DrawSubset call.
Cleaning up is done as expected; we simply release the allocated
interfaces:
void Cleanup()
{
d3d::Release<ID3DXMesh*>(Teapot);