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/***************************************************************************/
/* Creation of Z-Buffer */
/***************************************************************************/
/*
* D3DAppICreateZBuffer
* Create a Z-Buffer of the appropriate depth and attach it to the back
* buffer.
*/
BOOL
D3DAppICreateZBuffer(int w, int h, int driver)
{
DDSURFACEDESC ddsd;
DWORD devDepth;
/*
* Release any Z-Buffer that might be around just in case.
*/
RELEASE(d3dappi.lpZBuffer);
/*
* If this driver does not do z-buffering, don't create a z-buffer
*/
if (!d3dappi.Driver[driver].bDoesZBuffer)
return TRUE;
memset(&ddsd, 0 ,sizeof(DDSURFACEDESC));
ddsd.dwSize = sizeof( ddsd );
ddsd.dwFlags = DDSD_WIDTH | DDSD_HEIGHT | DDSD_CAPS |
DDSD_ZBUFFERBITDEPTH;
ddsd.ddsCaps.dwCaps = DDSCAPS_ZBUFFER;
ddsd.dwHeight = h;
ddsd.dwWidth = w;
/*
* If this is a hardware D3D driver, the Z-Buffer MUST end up in video
* memory. Otherwise, it MUST end up in system memory.
*/
if (d3dappi.Driver[driver].bIsHardware)
ddsd.ddsCaps.dwCaps |= DDSCAPS_VIDEOMEMORY;
else
ddsd.ddsCaps.dwCaps |= DDSCAPS_SYSTEMMEMORY;
/*
* Get the Z buffer bit depth from this driver's D3D device description
*/
devDepth = d3dappi.Driver[driver].Desc.dwDeviceZBufferBitDepth;
if (devDepth & DDBD_32)
ddsd.dwZBufferBitDepth = 32;
else if (devDepth & DDBD_24)
ddsd.dwZBufferBitDepth = 24;
else if (devDepth & DDBD_16)
ddsd.dwZBufferBitDepth = 16;
else if (devDepth & DDBD_8)
ddsd.dwZBufferBitDepth = 8;
else {
D3DAppISetErrorString("Unsupported Z-buffer depth requested by device.\n");
return FALSE;
}
LastError = d3dappi.lpDD->lpVtbl->CreateSurface(d3dappi.lpDD, &ddsd,
&d3dappi.lpZBuffer,
NULL);
if(LastError != DD_OK) {
D3DAppISetErrorString("CreateSurface for Z-buffer failed.\n%s",
D3DAppErrorToString(LastError));
goto exit_with_error;
}
/*
* Attach the Z-buffer to the back buffer so D3D will find it
*/
LastError =
d3dappi.lpBackBuffer->lpVtbl->AddAttachedSurface(d3dappi.lpBackBuffer,
d3dappi.lpZBuffer);
if(LastError != DD_OK) {
D3DAppISetErrorString("AddAttachedBuffer failed for Z-Buffer.\n%s",
D3DAppErrorToString(LastError));
goto exit_with_error;
}
/*
* Find out if it ended up in video memory (FYI).
*/
LastError = D3DAppIGetSurfDesc(&ddsd, d3dappi.lpZBuffer);
if (LastError != DD_OK) {
D3DAppISetErrorString("Failed to get surface description of Z buffer.\n%s",
D3DAppErrorToString(LastError));
goto exit_with_error;
}
d3dappi.bZBufferInVideo =
(ddsd.ddsCaps.dwCaps & DDSCAPS_VIDEOMEMORY) ? TRUE : FALSE;
return TRUE;
exit_with_error:
RELEASE(d3dappi.lpZBuffer);
return FALSE;
}
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