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