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rewrite D3DParseUnknownCommand to use switch case instead

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it looks better. Add a summer of msdn documentions how the first input parameter works. So u do not need read the whole doc for it. Add some more comment in the code

svn path=/trunk/; revision=24625
This commit is contained in:
Magnus Olsen 2006-10-23 17:37:51 +00:00
parent d9e412fef7
commit f11bf40b80
1 changed files with 52 additions and 33 deletions
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71
reactos/dll/directx/ddraw/main.c
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@ -128,11 +128,26 @@ DirectDrawEnumerateExW(LPDDENUMCALLBACKEXW lpCallback,
for more info about this command
*/
summuer the msdn
/*
* UNIMPLEMENT
* Status FIXME need be implement and this code is realy need be tested
The buffer start with D3DHAL_DP2COMMAND struct afer that it follow either one struct or no struct at at all
example for command D3DDP2OP_VIEWPORTINFO
then lpCmd will look like this
----------------------------------------
| struct | Pos |
----------------------------------------
| D3DHAL_DP2COMMAND | 0x00 - 0x03 |
---------------------------------------
| D3DHAL_DP2VIEWPORTINFO | 0x04 - xxxx |
---------------------------------------
to calc end of the lpCmd buffer in this exmaple
D3DHAL_DP2COMMAND->wStateCount * sizeof(D3DHAL_DP2VIEWPORTINFO);
now you got number of bytes but we need add the size of D3DHAL_DP2COMMAND
to get this right. the end should be
sizeof(D3DHAL_DP2COMMAND) + ( D3DHAL_DP2COMMAND->wStateCount * sizeof(D3DHAL_DP2VIEWPORTINFO));
to get the xxxx end positions.
*/
HRESULT
@ -140,10 +155,9 @@ WINAPI
D3DParseUnknownCommand( LPVOID lpCmd,
LPVOID *lpRetCmd)
{
DWORD retCode = DD_OK;
LPD3DHAL_DP2COMMAND dp2command = lpCmd;
DWORD retCode = D3DERR_COMMAND_UNPARSED;
/* prevent it crash if null pointer are being sent */
if ( (lpCmd == NULL) || (lpRetCmd == NULL) )
{
@ -152,33 +166,38 @@ D3DParseUnknownCommand( LPVOID lpCmd,
*lpRetCmd = lpCmd;
switch (dp2command->bCommand)
{
/* check for vaild command, only 3 command is vaild */
if (dp2command->bCommand == D3DDP2OP_VIEWPORTINFO)
{
/* dp2command->wStateCount * sizeof D3DHAL_DP2VIEWPORTINFO + 4 bytes */
*(PBYTE)lpRetCmd += ((dp2command->wStateCount * sizeof(D3DHAL_DP2VIEWPORTINFO)) + sizeof(ULONG_PTR));
retCode = 0;
}
else if (dp2command->bCommand == D3DDP2OP_WINFO)
{
/* dp2command->wStateCount * sizeof D3DHAL_DP2WINFO + 4 bytes */
*(PBYTE)lpRetCmd += (dp2command->wStateCount * sizeof(D3DHAL_DP2WINFO)) + sizeof(ULONG_PTR);
retCode = 0;
}
else if (dp2command->bCommand == 0x0d)
{
/* dp2command->wStateCount * how many wStateCount ? + 4 bytes */
*(PBYTE)lpRetCmd += ((dp2command->wStateCount * dp2command->bReserved) + sizeof(ULONG_PTR));
retCode = 0;
}
case D3DDP2OP_VIEWPORTINFO:
*(PBYTE)lpRetCmd += ((dp2command->wStateCount * sizeof(D3DHAL_DP2VIEWPORTINFO)) + sizeof(D3DHAL_DP2COMMAND));
break;
/* set error code for command 0 to 3, 8 and 15 to 255 */
else if ( (dp2command->bCommand <= D3DDP2OP_INDEXEDTRIANGLELIST) || // dp2command->bCommand <= with 0 to 3
case D3DDP2OP_WINFO:
*(PBYTE)lpRetCmd += (dp2command->wStateCount * sizeof(D3DHAL_DP2WINFO)) + sizeof(D3DHAL_DP2COMMAND);
break;
case 0x0d: /* Undocumented in MSDN */
*(PBYTE)lpRetCmd += ((dp2command->wStateCount * dp2command->bReserved) + sizeof(D3DHAL_DP2COMMAND));
break;
/* set the error code */
default:
if ( (dp2command->bCommand <= D3DDP2OP_INDEXEDTRIANGLELIST) || // dp2command->bCommand <= with 0 to 3
(dp2command->bCommand == D3DDP2OP_RENDERSTATE) || // dp2command->bCommand == with 8
(dp2command->bCommand >= D3DDP2OP_LINELIST) ) // dp2command->bCommand >= with 15 to 255
{
/* set error code for command 0 to 3, 8 and 15 to 255 */
retCode = E_FAIL;
}
else
{ /* set error code for 4 - 7, 9 - 12, 14 */
retCode = D3DERR_COMMAND_UNPARSED;
}
}
return retCode;
}