dll/directx/d3d9/d3d9_helpers.c

   1 /*
   2  * COPYRIGHT:       See COPYING in the top level directory
   3  * PROJECT:         ReactOS ReactX
   4  * FILE:            dll/directx/d3d9/d3d9_helpers.c
   5  * PURPOSE:         d3d9.dll helper functions
   6  * PROGRAMERS:      Gregor Brunmar <gregor (dot) brunmar (at) home (dot) se>
   7  */
   8
   9 #include <d3d9.h>
  10 #include "d3d9_helpers.h"
  11 #include <stdio.h>
  12 #include <ddraw.h>
  13 #include <debug.h>
  14
  15 #define MEM_ALIGNMENT 0x20
  16
  17 static LPCSTR D3D9_DebugRegPath = "Software\\Microsoft\\Direct3D";
  18
  19 BOOL ReadRegistryValue(IN DWORD ValueType, IN LPCSTR ValueName, OUT LPBYTE DataBuffer, IN OUT LPDWORD DataBufferSize)
  20 {
  21     HKEY hKey;
  22     DWORD Type;
  23     LONG Ret;
  24
  25     if (ERROR_SUCCESS != RegOpenKeyExA(HKEY_LOCAL_MACHINE, D3D9_DebugRegPath, 0, KEY_QUERY_VALUE, &hKey))
  26         return FALSE;
  27
  28     Ret = RegQueryValueExA(hKey, ValueName, 0, &Type, DataBuffer, DataBufferSize);
  29
  30     RegCloseKey(hKey);
  31
  32     if (ERROR_SUCCESS != Ret)
  33         return FALSE;
  34
  35     if (Type != ValueType)
  36         return FALSE;
  37
  38     return TRUE;
  39 }
  40
  41 HRESULT AlignedAlloc(IN OUT LPVOID *ppObject, IN SIZE_T dwSize)
  42 {
  43     ULONG AddressOffset;
  44     ULONG AlignedMask = MEM_ALIGNMENT - 1;
  45     CHAR *AlignedPtr;
  46     ULONG_PTR *AlignedOffsetPtr;
  47
  48     if (ppObject == 0)
  49         return DDERR_INVALIDPARAMS;
  50
  51     if (dwSize == 0)
  52     {
  53         *ppObject = NULL;
  54         return S_OK;
  55     }
  56
  57     dwSize += MEM_ALIGNMENT;
  58
  59     AlignedPtr = (CHAR *)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, dwSize);
  60
  61     if (AlignedPtr == 0)
  62         return DDERR_OUTOFMEMORY;
  63
  64     AddressOffset = MEM_ALIGNMENT - ((ULONG)AlignedPtr & AlignedMask);
  65
  66     AlignedPtr += AddressOffset;
  67
  68     AlignedOffsetPtr = (ULONG_PTR *)(AlignedPtr - sizeof(ULONG));
  69     *AlignedOffsetPtr = AddressOffset;
  70
  71     *ppObject = (ULONG_PTR *)AlignedPtr;
  72
  73     return S_OK;
  74 }
  75
  76 VOID AlignedFree(IN OUT LPVOID pObject)
  77 {
  78     CHAR *NonAlignedPtr = pObject;
  79     ULONG_PTR *AlignedPtr = pObject;
  80
  81     if (pObject == 0)
  82         return;
  83
  84     NonAlignedPtr -= *(AlignedPtr - 1);
  85
  86     HeapFree(GetProcessHeap(), 0, NonAlignedPtr);
  87 }