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jabo: revise ReadScreen to reduce impact on weirdly slow systems

This commit is contained in:
zeromus 2014-07-26 22:50:50 +00:00
parent e07f143e88
commit 3a4102571f
2 changed files with 15 additions and 8 deletions
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4
libmupen64plus/D3D8Interceptor/Direct3D8Functions.cpp
View File

@ -131,6 +131,10 @@ extern "C"
D3D8Base::IDirect3DDevice8* base_device = NULL;
HRESULT hr = m_pD3D->CreateDevice(Adapter,DeviceType,hFocusWindow,BehaviorFlags,pPresentationParameters,&base_device);
if(FAILED(hr))
{
return hr;
}
// Wrap the real object
D3D8Wrapper::IDirect3DDevice8* f = D3D8Wrapper::IDirect3DDevice8::GetDirect3DDevice(base_device);

19
libmupen64plus/D3D8Interceptor/d3d8Wrapper.cpp
View File

@ -91,15 +91,18 @@ extern "C"
D3D8Base::D3DLOCKED_RECT locked;
HRESULT hr = D3D8Wrapper::render_surface->LockRect(&locked,&entire_buffer,D3DLOCK_READONLY);
// read out pBits from the LOCKED_RECT
int from_row = desc.Height - 1;
for (int dest_row = 0; dest_row < desc.Height; dest_row++)
//UNACCEPTABLE CODE: hardcode a buffer for doing one memcpy from vram
//this prevents irregular access and speeds up the copying on some systems
static char buffer[1024*1024*4];
memcpy(buffer,(char*)locked.pBits,locked.Pitch * desc.Height);
//this loop was reversed from the original.
//it should be faster anyway if anything since the reading can be prefetched forwardly.
int dest_row = desc.Height - 1;
for (int from_row = 0; from_row < desc.Height; from_row++)
{
for (int col = 0; col < desc.Width*4; col++)
{
((char *)dest)[dest_row * desc.Width * 4 + col] = ((char *)locked.pBits)[from_row * desc.Width * 4 + col];
}
from_row--;
memcpy((char*)dest + (dest_row * desc.Width*4),(char*)buffer + from_row * locked.Pitch, desc.Width*4);
dest_row--;
}
// unlock rect