Question

I’m a beginner in d3d development and I’m stuck on my first issue. I’ve created a little program that draws a terrain with random heights in each vertex and a light that moves from left to right (plus basic keyboard management). Problem is the animated light is very skippy, input recognition fails pretty often and cpu usage is 50% constant (I have a dual core cpu). I thought that this issue was caused by incorrect throttling, but even after fixing the code i still have problems. My main loop is

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
{
    HWND wndHandle;
    int width = 640;
    int height = 480;

    wndHandle = InitWindow(hInstance, width, height);
    InitDirect3D(wndHandle, width, height);
    DInputInit(hInstance, wndHandle);
    SceneSetUp();
    MSG msg = {0};
    QueryPerformanceFrequency((LARGE_INTEGER *) &perf_cnt);
    time_count = perf_cnt / fixedtic;
    QueryPerformanceCounter((LARGE_INTEGER *) &next_time);
    while (WM_QUIT != msg.message)
    {
        if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
        {
            TranslateMessage(&msg);
            DispatchMessage(&msg);
            continue;
        }
        HandleInput();
        QueryPerformanceCounter((LARGE_INTEGER *) &cur_time);
        if (cur_time>next_time) {
            Render();
            next_time += time_count;
            if (next_time < cur_time)
                next_time = cur_time + time_count;
        }
    }
    ShutdownDirect3D();
    return (int)msg.wParam;
}

while the Render function is

void Render()
{
    QueryPerformanceCounter((LARGE_INTEGER *) &curtime);
    timespan = (curtime - last_time) * time_factor;
    last_time = curtime;
    model.pD3DDevice->ClearRenderTargetView(model.pRenderTargetView, D3DXCOLOR(0.0f, 0.0f, 0.0f, 0.0f));
    lightpos.x = (float)cos(ang) * 256.0f;
    ang += timespan * 0.5;
    lpvar->SetFloatVector((float *) lightpos);
    D3DXMatrixLookAtLH(&V, &model.campos, new D3DXVECTOR3(0.0f, 0.0f, 0.0f), new D3DXVECTOR3(0.0f, 1.0f, 0.0f));
    D3DXMATRIX VP = V*P;
    camvar->SetFloatVector((float *)model.campos);
    ViewProjection->SetMatrix((float *) &VP);
    for(UINT p=0; p < techniqueDescription.Passes; ++p)
    {
        pTechnique->GetPassByIndex(p)->Apply(0);
        model.pD3DDevice->DrawIndexed(numIndices, 0, 0);
    }
    model.pSwapChain->Present(0, 0);
}

Any help is appreciated

Answer 1

Ok, I nailed it and I think I deserve a punch in my face. I was creating a reference device instead of a hardware device