| /**************************************************************************** |
| * |
| * SciTech Nucleus Graphics Architecture |
| * |
| * Copyright (C) 1991-1998 SciTech Software, Inc. |
| * All rights reserved. |
| * |
| * ====================================================================== |
| * |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW| |
| * | | |
| * |This copyrighted computer code contains proprietary technology | |
| * |owned by SciTech Software, Inc., located at 505 Wall Street, | |
| * |Chico, CA 95928 USA (http://www.scitechsoft.com). | |
| * | | |
| * |The contents of this file are subject to the SciTech Nucleus | |
| * |License; you may *not* use this file or related software except in | |
| * |compliance with the License. You may obtain a copy of the License | |
| * |at http://www.scitechsoft.com/nucleus-license.txt | |
| * | | |
| * |Software distributed under the License is distributed on an | |
| * |"AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or | |
| * |implied. See the License for the specific language governing | |
| * |rights and limitations under the License. | |
| * | | |
| * |REMOVAL OR MODIFICATION OF THIS HEADER IS STRICTLY PROHIBITED BY LAW| |
| * ====================================================================== |
| * |
| * Language: ANSI C |
| * Environment: Win32 |
| * |
| * Description: OS specific Nucleus Graphics Architecture services for |
| * the Win32 operating system environments. |
| * |
| ****************************************************************************/ |
| |
| #include "pm_help.h" |
| #include "pmapi.h" |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #define STRICT |
| #define WIN32_LEAN_AND_MEAN |
| #include <windows.h> |
| |
| /*------------------------- Global Variables ------------------------------*/ |
| |
| #define DLL_NAME "nga_w32.dll" |
| |
| extern HANDLE _PM_hDevice; |
| static HMODULE hModDLL = NULL; |
| static ibool useRing0Driver = false; |
| static ibool haveRDTSC; |
| static GA_largeInteger countFreq; |
| |
| /*-------------------------- Implementation -------------------------------*/ |
| |
| /**************************************************************************** |
| REMARKS: |
| Loads the shared "nga_w32.dll" library from disk and connects to it. This |
| library is *always* located in the same directory as the Nucleus |
| graphics.bpd file. |
| ****************************************************************************/ |
| static ibool LoadSharedDLL(void) |
| { |
| char filename[PM_MAX_PATH]; |
| char bpdpath[PM_MAX_PATH]; |
| |
| /* Check if we have already loaded the DLL */ |
| if (hModDLL) |
| return true; |
| PM_init(); |
| |
| /* Open the DLL file */ |
| if (!PM_findBPD(DLL_NAME,bpdpath)) |
| return false; |
| strcpy(filename,bpdpath); |
| strcat(filename,DLL_NAME); |
| if ((hModDLL = LoadLibrary(filename)) == NULL) |
| return false; |
| return true; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| path - Local path to the Nucleus driver files. |
| |
| REMARKS: |
| This function is used by the application program to override the location |
| of the Nucleus driver files that are loaded. Normally the loader code |
| will look in the system Nucleus directories first, then in the 'drivers' |
| directory relative to the current working directory, and finally relative |
| to the MGL_ROOT environment variable. |
| |
| Note that for Win32 we also call into the loaded PMHELP device driver |
| as necessary to change the local Nucleus path for system wide Nucleus |
| drivers. |
| ****************************************************************************/ |
| void NAPI GA_setLocalPath( |
| const char *path) |
| { |
| DWORD inBuf[1]; |
| DWORD outBuf[1],outCnt; |
| |
| PM_setLocalBPDPath(path); |
| if (_PM_hDevice != INVALID_HANDLE_VALUE) { |
| inBuf[0] = (DWORD)path; |
| DeviceIoControl(_PM_hDevice, PMHELP_GASETLOCALPATH32, |
| inBuf, sizeof(inBuf), outBuf, sizeof(outBuf), &outCnt, NULL); |
| } |
| } |
| |
| /**************************************************************************** |
| RETURNS: |
| Pointer to the system wide PM library imports, or the internal version if none |
| |
| REMARKS: |
| In order to support deploying new Nucleus drivers that may require updated |
| PM library functions, we check here to see if there is a system wide version |
| of the PM functions available. If so we return those functions for use with |
| the system wide Nucleus drivers, otherwise the compiled in version of the PM |
| library is used with the application local version of Nucleus. |
| ****************************************************************************/ |
| PM_imports * NAPI GA_getSystemPMImports(void) |
| { |
| PM_imports * pmImp; |
| PM_imports * (NAPIP _GA_getSystemPMImports)(void); |
| |
| if (LoadSharedDLL()) { |
| /* Note that Visual C++ build DLL's with only a single underscore in front |
| * of the exported name while Watcom C provides two of them. We check for |
| * both to allow working with either compiled DLL. |
| */ |
| if ((_GA_getSystemPMImports = (void*)GetProcAddress(hModDLL,"_GA_getSystemPMImports")) != NULL) { |
| if ((_GA_getSystemPMImports = (void*)GetProcAddress(hModDLL,"__GA_getSystemPMImports")) != NULL) { |
| pmImp = _GA_getSystemPMImports(); |
| memcpy(&_PM_imports,pmImp,MIN(_PM_imports.dwSize,pmImp->dwSize)); |
| return pmImp; |
| } |
| } |
| } |
| return &_PM_imports; |
| } |
| |
| /**************************************************************************** |
| PARAMETERS: |
| gaExp - Place to store the exported functions |
| shared - True if connecting to the shared, global Nucleus driver |
| |
| REMARKS: |
| For Win32 if we are connecting to the shared, global Nucleus driver (loaded |
| at ring 0) then we need to load a special nga_w32.dll library which contains |
| thunks to call down into the Ring 0 device driver as necessary. If we are |
| connecting to the application local Nucleus drivers (ie: Nucleus on DirectDraw |
| emulation layer) then we do nothing here. |
| ****************************************************************************/ |
| ibool NAPI GA_getSharedExports( |
| GA_exports *gaExp, |
| ibool shared) |
| { |
| GA_exports * exp; |
| GA_exports * (NAPIP _GA_getSystemGAExports)(void); |
| |
| useRing0Driver = false; |
| if (shared) { |
| if (!LoadSharedDLL()) |
| PM_fatalError("Unable to load " DLL_NAME "!"); |
| if ((_GA_getSystemGAExports = (void*)GetProcAddress(hModDLL,"_GA_getSystemGAExports")) == NULL) |
| if ((_GA_getSystemGAExports = (void*)GetProcAddress(hModDLL,"__GA_getSystemGAExports")) == NULL) |
| PM_fatalError("Unable to load " DLL_NAME "!"); |
| exp = _GA_getSystemGAExports(); |
| memcpy(gaExp,exp,MIN(gaExp->dwSize,exp->dwSize)); |
| useRing0Driver = true; |
| return true; |
| } |
| return false; |
| } |
| |
| #ifndef TEST_HARNESS |
| /**************************************************************************** |
| REMARKS: |
| Nothing special for this OS |
| ****************************************************************************/ |
| ibool NAPI GA_queryFunctions( |
| GA_devCtx *dc, |
| N_uint32 id, |
| void _FAR_ *funcs) |
| { |
| static ibool (NAPIP _GA_queryFunctions)(GA_devCtx *dc,N_uint32 id,void _FAR_ *funcs) = NULL; |
| |
| if (useRing0Driver) { |
| // Call the version in nga_w32.dll if it is loaded |
| if (!_GA_queryFunctions) { |
| if ((_GA_queryFunctions = (void*)GetProcAddress(hModDLL,"_GA_queryFunctions")) == NULL) |
| if ((_GA_queryFunctions = (void*)GetProcAddress(hModDLL,"__GA_queryFunctions")) == NULL) |
| PM_fatalError("Unable to get exports from " DLL_NAME "!"); |
| } |
| return _GA_queryFunctions(dc,id,funcs); |
| } |
| return __GA_exports.GA_queryFunctions(dc,id,funcs); |
| } |
| |
| /**************************************************************************** |
| REMARKS: |
| Nothing special for this OS |
| ****************************************************************************/ |
| ibool NAPI REF2D_queryFunctions( |
| REF2D_driver *ref2d, |
| N_uint32 id, |
| void _FAR_ *funcs) |
| { |
| static ibool (NAPIP _REF2D_queryFunctions)(REF2D_driver *ref2d,N_uint32 id,void _FAR_ *funcs) = NULL; |
| |
| if (useRing0Driver) { |
| // Call the version in nga_w32.dll if it is loaded |
| if (!_REF2D_queryFunctions) { |
| if ((_REF2D_queryFunctions = (void*)GetProcAddress(hModDLL,"_REF2D_queryFunctions")) == NULL) |
| if ((_REF2D_queryFunctions = (void*)GetProcAddress(hModDLL,"__REF2D_queryFunctions")) == NULL) |
| PM_fatalError("Unable to get exports from " DLL_NAME "!"); |
| } |
| return _REF2D_queryFunctions(ref2d,id,funcs); |
| } |
| return __GA_exports.REF2D_queryFunctions(ref2d,id,funcs); |
| } |
| #endif |
| |
| /**************************************************************************** |
| REMARKS: |
| This function initialises the high precision timing functions for the |
| Nucleus loader library. |
| ****************************************************************************/ |
| ibool NAPI GA_TimerInit(void) |
| { |
| if (_GA_haveCPUID() && (_GA_getCPUIDFeatures() & CPU_HaveRDTSC) != 0) { |
| haveRDTSC = true; |
| return true; |
| } |
| else if (QueryPerformanceFrequency((LARGE_INTEGER*)&countFreq)) { |
| haveRDTSC = false; |
| return true; |
| } |
| return false; |
| } |
| |
| /**************************************************************************** |
| REMARKS: |
| This function reads the high resolution timer. |
| ****************************************************************************/ |
| void NAPI GA_TimerRead( |
| GA_largeInteger *value) |
| { |
| if (haveRDTSC) |
| _GA_readTimeStamp(value); |
| else |
| QueryPerformanceCounter((LARGE_INTEGER*)value); |
| } |
| |
