Aha! No, I use the D3DDEVTYPE_HAL

if CreateDevice() fails, what do you do?
you have written that the GPU is (almost?) Idle. it seems that it is not used at all!

I'm not doing anything :-) Is that bad?
The gpu is idle alwas (says NVIDIA NvPerhud program..)

Here is some code:

void drawScene()
{
directx.dxDev->Clear(0, NULL, D3DCLEAR_TARGET| D3DCLEAR_ZBUFFER , 0x00FFFFFF, 1.0f, 0 );
directx.dxDev->BeginScene();

directx.drawPrimitives();
font.drawFPS();

directx.dxDev->EndScene();
directx.dxDev->Present(NULL, NULL, NULL, NULL );
}

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int CmdShow)
{
window.createWindow(hInstance,CmdShow);
directx.direct3DInit(&window);
directx.createVertexBuffer(300*3); //create vertexbuffer containing 900 vertices
world.drawWorld(&directx);

font.initFont(&directx);


MSG msg;
while(1)
{
if (PeekMessage(&msg,0,0,0,PM_NOREMOVE))
{
int result = GetMessage(&msg,0,0,0);
if(!result) return msg.wParam;

TranslateMessage(&msg);
DispatchMessage(&msg);


if (GetAsyncKeyState(VK_ESCAPE))
{
PostQuitMessage(0);
return(0);
}
}

drawScene();
}

directx.release();
directx.releaseVB();
}

////////////////////////////////////////////////////////////

bool DirectX::direct3DInit(Window *pwindow)
{

dxD3D = Direct3DCreate9( D3D_SDK_VERSION);
D3DDISPLAYMODE displaymode;
dxD3D->GetAdapterDisplayMode(D3DADAPTER_DEFAULT, &displaymode);
D3DPRESENT_PARAMETERS pp;
ZeroMemory(&pp, sizeof(pp));

pp.BackBufferFormat= displaymode.Format;
pp.Windowed= TRUE;
pp.BackBufferCount= 1;
//pp.MultiSampleType= D3DMULTISAMPLE_NONE;
//pp.MultiSampleQuality= 0;
pp.SwapEffect= D3DSWAPEFFECT_DISCARD;
pp.hDeviceWindow= pwindow-> hWnd;
pp.FullScreen_RefreshRateInHz= D3DPRESENT_RATE_DEFAULT;
pp.PresentationInterval= D3DPRESENT_INTERVAL_IMMEDIATE;
pp.EnableAutoDepthStencil= TRUE;
pp.AutoDepthStencilFormat= D3DFMT_D16;

dxD3D->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, pwindow->hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, &dxDev);

dxD3D->CreateDevice(AdapterToUse, DeviceType, pwindow->hWnd, D3DCREATE_HARDWARE_VERTEXPROCESSING, &pp, &dxDev);

setupView();
setupRenderState();
}

//////////////////////
some code here setting upp viewmat and stuff
/////////////


void DirectX::createVertexBuffer(int maxNrVertices)
{
dxDev->CreateVertexBuffer(maxNrVertices*sizeof(Vertex), D3DUSAGE_WRITEONLY, D3DFVF_CUSTOMVERTEX,D3DPOOL_DEFAULT, &dxVB, NULL);
}

void DirectX::fillVertexBuffer(Vertex vertex[], int nrVertices)
{
VOID* pVertices;
dxVB->Lock(0, 0, (void**)&pVertices, 0);
memcpy(pVertices, vertex, sizeof(Vertex)*nrVertices);
dxVB->Unlock();
}

void DirectX::drawPrimitives()
{
dxDev->SetFVF(D3DFVF_CUSTOMVERTEX);
dxDev->SetStreamSource(0, dxVB, 0, sizeof(Vertex));
dxDev->DrawPrimitive(D3DPT_TRIANGLELIST, 0, 300);
}
/////////////////////////////////////////////////

void World::drawWorld(DirectX *directx)
{
srand ( time(NULL) );

int r,b,g;

Vertex vertex[1000];
int i=0;
float y=1;
float z = 0;

for(int j=0; j<300;j++)
{
z+=0.01;
y+=0.01;
r = rand()%256;
g = rand()%256;
b = rand()%256;

initVertex(vertex, i++, 0.0f, 0.0f, z, D3DCOLOR_XRGB(r,g,b));
initVertex(vertex, i++, 1.0f, y, z, D3DCOLOR_XRGB(r,g,b));
initVertex(vertex, i++, 1.0f, 0.0f, z, D3DCOLOR_XRGB(r,g,b));
}

directx->fillVertexBuffer(vertex,300*3); // 300*3 = nrVertices
}

void World::initVertex(Vertex vertex[], int index, float x, float y, float z, unsigned long color)
{
vertex[index].color = color;
vertex[index].x = x;
vertex[index].y = y;
vertex[index].z = z;

}

Noticed a little fault in the code I uploaded. I do not call CreateDevice twice! The second CreateDevice is not supposed to be there :-)

I noticed two things, first you draw 300 triangles on top of each other, second i think you draw from back to front. Try setting Z to the max and then -= instead.

Though it doesn't seem to be that big a problem considering how many triangles you are drawing...

hmmmmmmmmmmmmmmm.....
pp.SwapEffect = D3DSWAPEFFECT_DISCARD ;) ?? ??

What should I initialize the SwapEffect to instead?
I don't even know what that thing do...