dglcontext.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/****************************************************************************
*
*                        Mesa 3-D graphics library
*                        Direct3D Driver Interface
*
*  ========================================================================
*
*   Copyright (C) 1991-2004 SciTech Software, Inc. All rights reserved.
*
*   Permission is hereby granted, free of charge, to any person obtaining a
*   copy of this software and associated documentation files (the "Software"),
*   to deal in the Software without restriction, including without limitation
*   the rights to use, copy, modify, merge, publish, distribute, sublicense,
*   and/or sell copies of the Software, and to permit persons to whom the
*   Software is furnished to do so, subject to the following conditions:
*
*   The above copyright notice and this permission notice shall be included
*   in all copies or substantial portions of the Software.
*
*   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
*   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
*   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
*   SCITECH SOFTWARE INC BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
*   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
*   OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
*   SOFTWARE.
*
*  ======================================================================
*
* Language:     ANSI C
* Environment:  Windows 9x (Win32)
*
* Description:  Context handling.
*
****************************************************************************/

#include "dglcontext.h"

// Get compile errors without this. KeithH
//#include "scitech.h"	// ibool, etc.

#ifdef _USE_GLD3_WGL
#include "gld_driver.h"

extern void _gld_mesa_warning(GLcontext *, char *);
extern void _gld_mesa_fatal(GLcontext *, char *);
#endif // _USE_GLD3_WGL

// TODO: Clean out old DX6-specific code from GLD 2.x CAD driver
// if it is no longer being built as part of GLDirect. (DaveM)

// ***********************************************************************

#define GLDERR_NONE     0
#define GLDERR_MEM      1
#define GLDERR_DDRAW    2
#define GLDERR_D3D      3
#define GLDERR_BPP      4

char szResourceWarning[] =
"GLDirect does not have enough video memory resources\n"
"to support the requested OpenGL rendering context.\n\n"
"You may have to reduce the current display resolution\n"
"to obtain satisfactory OpenGL performance.\n";

char szDDrawWarning[] =
"GLDirect is unable to initialize DirectDraw for the\n"
"requested OpenGL rendering context.\n\n"
"You will have to check the DirectX control panel\n"
"for further information.\n";

char szD3DWarning[] =
"GLDirect is unable to initialize Direct3D for the\n"
"requested OpenGL rendering context.\n\n"
"You may have to change the display mode resolution\n"
"color depth or check the DirectX control panel for\n"
"further information.\n";

char szBPPWarning[] =
"GLDirect is unable to use the selected color depth for\n"
"the requested OpenGL rendering context.\n\n"
"You will have to change the display mode resolution\n"
"color depth with the Display Settings control panel.\n";

int nContextError = GLDERR_NONE;

// ***********************************************************************

#define VENDORID_ATI 0x1002

static DWORD devATIRagePro[] = {
	0x4742, // 3D RAGE PRO BGA AGP 1X/2X
	0x4744, // 3D RAGE PRO BGA AGP 1X only
	0x4749, // 3D RAGE PRO BGA PCI 33 MHz
	0x4750, // 3D RAGE PRO PQFP PCI 33 MHz
	0x4751, // 3D RAGE PRO PQFP PCI 33 MHz limited 3D
	0x4C42, // 3D RAGE LT PRO BGA-312 AGP 133 MHz
	0x4C44, // 3D RAGE LT PRO BGA-312 AGP 66 MHz
	0x4C49, // 3D RAGE LT PRO BGA-312 PCI 33 MHz
	0x4C50, // 3D RAGE LT PRO BGA-256 PCI 33 MHz
	0x4C51, // 3D RAGE LT PRO BGA-256 PCI 33 MHz limited 3D
};

static DWORD devATIRageIIplus[] = {
	0x4755, // 3D RAGE II+
	0x4756, // 3D RAGE IIC PQFP PCI
	0x4757, // 3D RAGE IIC BGA AGP
	0x475A, // 3D RAGE IIC PQFP AGP
	0x4C47, // 3D RAGE LT-G
};

// ***********************************************************************

#ifndef _USE_GLD3_WGL
extern DGL_mesaFuncs mesaFuncs;
#endif

extern DWORD dwLogging;

#ifdef GLD_THREADS
#pragma message("compiling DGLCONTEXT.C vars for multi-threaded support")
CRITICAL_SECTION CriticalSection;		// for serialized access
DWORD		dwTLSCurrentContext = 0xFFFFFFFF;	// TLS index for current context
DWORD		dwTLSPixelFormat = 0xFFFFFFFF;		// TLS index for current pixel format
#endif
HGLRC		iCurrentContext = 0;		// Index of current context (static)
BOOL		bContextReady = FALSE;		// Context state ready ?

DGL_ctx		ctxlist[DGL_MAX_CONTEXTS];	// Context list

// ***********************************************************************

static BOOL bHaveWin95 = FALSE;
static BOOL bHaveWinNT = FALSE;
static BOOL bHaveWin2K = FALSE;

/****************************************************************************
REMARKS:
Detect the installed OS type.
****************************************************************************/
static void DetectOS(void)
{
    OSVERSIONINFO VersionInformation;
    LPOSVERSIONINFO lpVersionInformation = &VersionInformation;

    VersionInformation.dwOSVersionInfoSize = sizeof(VersionInformation);

	GetVersionEx(lpVersionInformation);

    switch (VersionInformation.dwPlatformId) {
    	case VER_PLATFORM_WIN32_WINDOWS:
			bHaveWin95 = TRUE;
			bHaveWinNT = FALSE;
			bHaveWin2K = FALSE;
            break;
    	case VER_PLATFORM_WIN32_NT:
			bHaveWin95 = FALSE;
			if (VersionInformation.dwMajorVersion <= 4) {
				bHaveWinNT = TRUE;
				bHaveWin2K = FALSE;
                }
            else {
				bHaveWinNT = FALSE;
				bHaveWin2K = TRUE;
                }
			break;
		case VER_PLATFORM_WIN32s:
			bHaveWin95 = FALSE;
			bHaveWinNT = FALSE;
			bHaveWin2K = FALSE;
			break;
        }
}

// ***********************************************************************

HWND hWndEvent = NULL;					// event monitor window
HWND hWndLastActive = NULL;				// last active client window
LONG __stdcall GLD_EventWndProc(HWND hwnd,UINT msg,WPARAM wParam,LPARAM lParam);

// ***********************************************************************

// Checks if the HGLRC is valid in range of context list.
BOOL dglIsValidContext(
	HGLRC a)
{
	return ((int)a > 0 && (int)a <= DGL_MAX_CONTEXTS);
}

// ***********************************************************************

// Convert a HGLRC to a pointer into the context list.
DGL_ctx* dglGetContextAddress(
	const HGLRC a)
{
	if (dglIsValidContext(a))
		return &ctxlist[(int)a-1];
	return NULL;
}

// ***********************************************************************

// Return the current HGLRC (however it may be stored for multi-threading).
HGLRC dglGetCurrentContext(void)
{
#ifdef GLD_THREADS
	HGLRC hGLRC;
	// load from thread-specific instance
	if (glb.bMultiThreaded) {
		// protect against calls from arbitrary threads
		__try {
			hGLRC = (HGLRC)TlsGetValue(dwTLSCurrentContext);
		}
		__except(EXCEPTION_EXECUTE_HANDLER) {
			hGLRC = iCurrentContext;
		}
	}
	// load from global static var
	else {
		hGLRC = iCurrentContext;
	}
	return hGLRC;
#else
	return iCurrentContext;
#endif
}

// ***********************************************************************

// Set the current HGLRC (however it may be stored for multi-threading).
void dglSetCurrentContext(HGLRC hGLRC)
{
#ifdef GLD_THREADS
	// store in thread-specific instance
	if (glb.bMultiThreaded) {
		// protect against calls from arbitrary threads
		__try {
			TlsSetValue(dwTLSCurrentContext, (LPVOID)hGLRC);
		}
		__except(EXCEPTION_EXECUTE_HANDLER) {
			iCurrentContext = hGLRC;
		}
	}
	// store in global static var
	else {
		iCurrentContext = hGLRC;
	}
#else
	iCurrentContext = hGLRC;
#endif
}

// ***********************************************************************

// Return the current HDC only for a currently active HGLRC.
HDC dglGetCurrentDC(void)
{
	HGLRC hGLRC;
	DGL_ctx* lpCtx;

	hGLRC = dglGetCurrentContext();
	if (hGLRC) {
		lpCtx = dglGetContextAddress(hGLRC);
		return lpCtx->hDC;
	}
	return 0;
}

// ***********************************************************************

void dglInitContextState()
{
	int i;
	WNDCLASS wc;

#ifdef GLD_THREADS
	// Allocate thread local storage indexes for current context and pixel format
	dwTLSCurrentContext = TlsAlloc();
	dwTLSPixelFormat = TlsAlloc();
#endif

	dglSetCurrentContext(NULL); // No current rendering context

	 // Clear all context data
	ZeroMemory(ctxlist, sizeof(ctxlist[0]) * DGL_MAX_CONTEXTS);

	for (i=0; i<DGL_MAX_CONTEXTS; i++)
		ctxlist[i].bAllocated = FALSE; // Flag context as unused

	// This section of code crashes the dll in circumstances where the app
	// creates and destroys contexts.
/*
	// Register the class for our event monitor window
	wc.style = 0;
	wc.lpfnWndProc = GLD_EventWndProc;
	wc.cbClsExtra = 0;
	wc.cbWndExtra = 0;
	wc.hInstance = GetModuleHandle(NULL);
	wc.hIcon = LoadIcon(GetModuleHandle(NULL), IDI_APPLICATION);
	wc.hCursor = LoadCursor(NULL, IDC_ARROW);
	wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
	wc.lpszMenuName = NULL;
	wc.lpszClassName = "GLDIRECT";
	RegisterClass(&wc);

	// Create the non-visible window to monitor all broadcast messages
	hWndEvent = CreateWindowEx(
		WS_EX_TOOLWINDOW,"GLDIRECT","GLDIRECT",WS_POPUP,
		0,0,0,0,
		NULL,NULL,GetModuleHandle(NULL),NULL);
*/

#ifdef GLD_THREADS
	// Create a critical section object for serializing access to
	// DirectDraw and DDStereo create/destroy functions in multiple threads
	if (glb.bMultiThreaded)
		InitializeCriticalSection(&CriticalSection);
#endif

	// Context state is now initialized and ready
	bContextReady = TRUE;
}

// ***********************************************************************

void dglDeleteContextState()
{
	int i;
	static BOOL bOnceIsEnough = FALSE;

	// Only call once, from either DGL_exitDriver(), or DLL_PROCESS_DETACH
	if (bOnceIsEnough)
		return;
	bOnceIsEnough = TRUE;

	for (i=0; i<DGL_MAX_CONTEXTS; i++) {
		if (ctxlist[i].bAllocated == TRUE) {
			ddlogPrintf(DDLOG_WARN, "** Context %i not deleted - cleaning up.", (i+1));
			dglDeleteContext((HGLRC)(i+1));
		}
	}

	// Context state is no longer ready
	bContextReady = FALSE;

    // If executed when DLL unloads, DDraw objects may be invalid.
    // So catch any page faults with this exception handler.
__try {

	// Release final DirectDraw interfaces
	if (glb.bDirectDrawPersistant) {
//		RELEASE(glb.lpGlobalPalette);
//		RELEASE(glb.lpDepth4);
//		RELEASE(glb.lpBack4);
//		RELEASE(glb.lpPrimary4);
//	    RELEASE(glb.lpDD4);
    }
}
__except(EXCEPTION_EXECUTE_HANDLER) {
    ddlogPrintf(DDLOG_WARN, "Exception raised in dglDeleteContextState.");
}

	// Destroy our event monitor window
	if (hWndEvent) {
		DestroyWindow(hWndEvent);
		hWndEvent = hWndLastActive = NULL;
	}

#ifdef GLD_THREADS
	// Destroy the critical section object
	if (glb.bMultiThreaded)
		DeleteCriticalSection(&CriticalSection);

	// Release thread local storage indexes for current HGLRC and pixel format
	TlsFree(dwTLSPixelFormat);
	TlsFree(dwTLSCurrentContext);
#endif
}

// ***********************************************************************

// Application Window message handler interception
static LONG __stdcall dglWndProc(
	HWND hwnd,
	UINT msg,
	WPARAM wParam,
	LPARAM lParam)
{
	DGL_ctx* 	lpCtx = NULL;
	LONG 		lpfnWndProc = 0L;
	int  		i;
	HGLRC 		hGLRC;
	RECT 		rect;
	PAINTSTRUCT	ps;
    BOOL        bQuit = FALSE;
    BOOL        bMain = FALSE;
    LONG        rc;

    // Get the window's message handler *before* it is unhooked in WM_DESTROY

    // Is this the main window?
    if (hwnd == glb.hWndActive) {
        bMain = TRUE;
        lpfnWndProc = glb.lpfnWndProc;
    }