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update the docs for NtGdiD3dContextCreate

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some points I did not make clear how it works. 


svn path=/trunk/; revision=32696
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Magnus Olsen 2008-03-16 00:16:42 +00:00
parent 40fe926b8c
commit eb7b8c651a
1 changed files with 11 additions and 5 deletions
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16
reactos/subsystems/win32/win32k/ntddraw/d3d.c
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@ -89,29 +89,35 @@ NtGdiDdCanCreateD3DBuffer(HANDLE hDirectDraw,
* @param HANDLE hSurfZ
* Handle to a DD_SURFACE_LOCAL. It is the Z deep buffer. According MSDN if it is set to NULL nothing should happen.
*
* @param D3DNTHAL_CONTEXTCREATEDATA* hSurfZ
* @param LPD3DNTHAL_CONTEXTCREATEDATA pdcci
* The buffer to create the context data
*
* @return
* DDHAL_DRIVER_HANDLED or DDHAL_DRIVER_NOTHANDLED if the driver supports this function.
* A full check is done by checking if the return value is DDHAL_DRIVER_HANDLED
* and puCanCreateSurfaceData->ddRVal is set to DD_OK.
* and pdcci->ddRVal is set to DD_OK.
*
*
* @remarks.
* dxg.sys NtGdiD3dContextCreate calls are redirected to the same function in the dxg.sys. As such they all work the same way.
*
* Before calling this function please set the hSurfZ->ddRVal to an error value such as DDERR_NOTUSPORTED,
* Before calling this function please set the pdcci->ddRVal to an error value such as DDERR_NOTSUPORTED,
* for the ddRVal will otherwise be unchanged even if an error occurs inside the driver.
* hSurfZ->dwhContext also needs to be filled in with the handle we got from NtGdiDdCreateDirectDrawObject
*
* pdcci->lpDDLcl is a pointer to DDRAWI_DIRECTDRAW_LCL, not DD_DIRECTDRAW_LOCAL as MSDN claims.
* pdcci->lpDDSLcl is a pointer to DDRAWI_DDRAWSURFACE_LCL, not DD_DDDRAWSURFACE_LOCAL as MSDN claims.
* pdcci->lpDDSZLcl is a pointer to DDRAWI_DDRAWSURFACE_LCL, not DD_DDRAWSURFACE_LOCAL as MSDN claims.
* pdcci->dwhContext also needs be filled in with the handle we receive from NtGdiDdCreateDirectDrawObject.
* pdcci->dwPID the processid it belong to, that you need to fill in.
* Do not forget LPD3DNTHAL_CONTEXTCREATEDATA is typecast of LPD3DHAL_CONTEXTCREATEDATA and thuse two struct are different size,
* the correct struct is LPD3DHAL_CONTEXTCREATEDATA.
*--*/
BOOL
STDCALL
NtGdiD3dContextCreate(HANDLE hDirectDrawLocal,
HANDLE hSurfColor,
HANDLE hSurfZ,
D3DNTHAL_CONTEXTCREATEDATA* pdcci)
LPD3DNTHAL_CONTEXTCREATEDATA pdcci)
{
PGD_D3DCONTEXTCREATE pfnD3dContextCreate = (PGD_D3DCONTEXTCREATE)gpDxFuncs[DXG_INDEX_DxD3dContextCreate].pfn;