int
D3DOverdrawWindow::
Loop(void)
{
int nOverdraw = 0;
IDirect3DQuery9* pOcclusionQuery;
DWORD numberOfPixelsDrawn;
d3d->CreateQuery(D3DQUERYTYPE_OCCLUSION, &pOcclusionQuery);
for (unsigned int iViewpoint = 0; iViewpoint < m_nViewpointCount;
iViewpoint++)
{
// Add an end marker to the command buffer queue.
pOcclusionQuery->Issue(D3DISSUE_BEGIN);
// Draw scene
SetupDraw(iViewpoint);
DrawModel();
d3d->EndScene();
d3d->Present(NULL, NULL, NULL, NULL);
// Add an end marker to the command buffer queue.
pOcclusionQuery->Issue(D3DISSUE_END);
// Force the driver to execute the commands from the command buffer.
// Empty the command buffer and wait until the GPU is idle.
while (S_FALSE == pOcclusionQuery->GetData(&numberOfPixelsDrawn,
sizeof(DWORD), D3DGETDATA_FLUSH))
;
nOverdraw += numberOfPixelsDrawn;
}
pOcclusionQuery->Release();
return nOverdraw;
}
bool Display::getOcclusionQuerySupport() const
{
if (!isInitialized())
{
return false;
}
IDirect3DQuery9 *query = NULL;
HRESULT result = mDevice->CreateQuery(D3DQUERYTYPE_OCCLUSION, &query);
if (SUCCEEDED(result) && query)
{
query->Release();
return true;
}
else
{
return false;
}
}