wingl.c File Reference

#include <precomp.h>
#include <debug.h>

Include dependency graph for wingl.c:

Go to the source code of this file.

Macros
#define	NDEBUG

Typedefs
typedef int(WINAPI *	CHOOSEPIXELFMT) (HDC, CONST PIXELFORMATDESCRIPTOR *)
typedef BOOL(WINAPI *	SETPIXELFMT) (HDC, int, CONST PIXELFORMATDESCRIPTOR *)
typedef BOOL(WINAPI *	SWAPBUFFERS) (HDC hdc)
typedef int(WINAPI *	DESCRIBEPIXELFMT) (HDC, int, UINT, LPPIXELFORMATDESCRIPTOR)
typedef int(WINAPI *	GETPIXELFMT) (HDC)

Functions
static BOOL	OpenGLInitFunction (PCSTR name, FARPROC *funcptr)
static BOOL	OpenGLEnable (void)
INT WINAPI	ChoosePixelFormat (HDC hdc, CONST PIXELFORMATDESCRIPTOR *ppfd)
INT WINAPI	DescribePixelFormat (HDC hdc, INT iPixelFormat, UINT nBytes, LPPIXELFORMATDESCRIPTOR ppfd)
INT WINAPI	GetPixelFormat (HDC hdc)
BOOL WINAPI	SetPixelFormat (HDC hdc, INT iPixelFormat, CONST PIXELFORMATDESCRIPTOR *ppfd)
BOOL WINAPI	SwapBuffers (HDC hdc)

Variables
static CHOOSEPIXELFMT	glChoosePixelFormat = NULL
static SETPIXELFMT	glSetPixelFormat = NULL
static SWAPBUFFERS	glSwapBuffers = NULL
static DESCRIBEPIXELFMT	glDescribePixelFormat = NULL
static GETPIXELFMT	glGetPixelFormat = NULL
HINSTANCE	hOpenGL = NULL

Macro Definition Documentation

NDEBUG

#define NDEBUG

Definition at line 26 of file wingl.c.

Typedef Documentation

CHOOSEPIXELFMT

typedef int(WINAPI * CHOOSEPIXELFMT) (HDC, CONST PIXELFORMATDESCRIPTOR *)

Definition at line 31 of file wingl.c.

DESCRIBEPIXELFMT

typedef int(WINAPI * DESCRIBEPIXELFMT) (HDC, int, UINT, LPPIXELFORMATDESCRIPTOR)

Definition at line 34 of file wingl.c.

GETPIXELFMT

typedef int(WINAPI * GETPIXELFMT) (HDC)

Definition at line 35 of file wingl.c.

SETPIXELFMT

typedef BOOL(WINAPI * SETPIXELFMT) (HDC, int, CONST PIXELFORMATDESCRIPTOR *)

Definition at line 32 of file wingl.c.

SWAPBUFFERS

typedef BOOL(WINAPI * SWAPBUFFERS) (HDC hdc)

Definition at line 33 of file wingl.c.

Function Documentation

ChoosePixelFormat()

INT WINAPI ChoosePixelFormat	(	HDC	hdc,
		CONST PIXELFORMATDESCRIPTOR *	ppfd
	)

Definition at line 113 of file wingl.c.

{
    if (glChoosePixelFormat == NULL)
        if (OpenGLEnable() == FALSE)
            return(0);
 
    return(glChoosePixelFormat(hdc, ppfd));
}

DescribePixelFormat()

INT WINAPI DescribePixelFormat	(	HDC	hdc,
		INT	iPixelFormat,
		UINT	nBytes,
		LPPIXELFORMATDESCRIPTOR	ppfd
	)

Definition at line 130 of file wingl.c.

{
    if (glDescribePixelFormat == NULL)
        if (OpenGLEnable() == FALSE)
            return(0);
 
    return(glDescribePixelFormat(hdc, iPixelFormat, nBytes, ppfd));
}

GetPixelFormat()

INT WINAPI GetPixelFormat

(

HDC

hdc

)

Definition at line 149 of file wingl.c.

{
    if (glGetPixelFormat == NULL)
        if (OpenGLEnable() == FALSE)
            return(0);
 
    return(glGetPixelFormat(hdc));
}

Referenced by SetPixelFormat().

OpenGLEnable()

static BOOL OpenGLEnable ( void  )

static

Definition at line 66 of file wingl.c.

{
    HMODULE hModOpengl32;
    BOOL Ret = TRUE;
 
    hModOpengl32 = LoadLibraryW(L"OPENGL32.DLL");
    if (hModOpengl32 == NULL)
        return FALSE;
 
    if (InterlockedCompareExchangePointer((PVOID*)&hOpenGL,
                                          (PVOID)hModOpengl32,
                                          NULL) != NULL)
    {
        FreeLibrary(hModOpengl32);
 
        /* NOTE: Even though another thread was faster loading the
                 library we can't just bail out here. We really need
                 to *try* to locate every function. This is slow but
                 thread-safe */
    }
 
    /* The cast is required on x64, because FARPROC has INT_PTR sized return */
    if (!OpenGLInitFunction("wglChoosePixelFormat", (FARPROC*)&glChoosePixelFormat))
        Ret = FALSE;
 
    if (!OpenGLInitFunction("wglSetPixelFormat", (FARPROC*)&glSetPixelFormat))
        Ret = FALSE;
 
    if (!OpenGLInitFunction("wglSwapBuffers", (FARPROC*)&glSwapBuffers))
        Ret = FALSE;
 
    if (!OpenGLInitFunction("wglDescribePixelFormat", (FARPROC*)&glDescribePixelFormat))
        Ret = FALSE;
 
    if (!OpenGLInitFunction("wglGetPixelFormat", (FARPROC*)&glGetPixelFormat))
        Ret = FALSE;
 
    return Ret;
}

Referenced by ChoosePixelFormat(), DescribePixelFormat(), GetPixelFormat(), SetPixelFormat(), and SwapBuffers().

OpenGLInitFunction()

static BOOL OpenGLInitFunction ( PCSTR  name, FARPROC *  funcptr  )

static

Definition at line 49 of file wingl.c.

{
    PVOID func;
 
    func = (PVOID)GetProcAddress(hOpenGL, name);
    if (func != NULL)
    {
        (void)InterlockedCompareExchangePointer((PVOID*)funcptr,
                                                func,
                                                NULL);
        return TRUE;
    }
 
    return FALSE;
}

Referenced by OpenGLEnable().

SetPixelFormat()

BOOL WINAPI SetPixelFormat	(	HDC	hdc,
		INT	iPixelFormat,
		CONST PIXELFORMATDESCRIPTOR *	ppfd
	)

Definition at line 165 of file wingl.c.

{
    /* Can only be set once */
    INT current = GetPixelFormat(hdc);
    if(current) return current == iPixelFormat ;
 
    if (glSetPixelFormat == NULL)
        if (OpenGLEnable() == FALSE)
            return(0);
 
    return(glSetPixelFormat(hdc, iPixelFormat, ppfd));
}

SwapBuffers()

BOOL WINAPI SwapBuffers

(

HDC

hdc

)

Definition at line 187 of file wingl.c.

{
    if (glSwapBuffers == NULL)
        if (OpenGLEnable() == FALSE)
            return(0);
 
 
    return(glSwapBuffers(hdc));
}

Referenced by DrawScene(), OnPaint(), ScreenSaverProc(), test_destroy(), test_destroy_read(), test_message_window(), and test_setpixelformat().

Variable Documentation

glChoosePixelFormat

CHOOSEPIXELFMT glChoosePixelFormat = NULL

static

Definition at line 38 of file wingl.c.

Referenced by ChoosePixelFormat(), and OpenGLEnable().

glDescribePixelFormat

DESCRIBEPIXELFMT glDescribePixelFormat = NULL

static

Definition at line 41 of file wingl.c.

Referenced by DescribePixelFormat(), and OpenGLEnable().

glGetPixelFormat

GETPIXELFMT glGetPixelFormat = NULL

static

Definition at line 42 of file wingl.c.

Referenced by GetPixelFormat(), and OpenGLEnable().

glSetPixelFormat

SETPIXELFMT glSetPixelFormat = NULL

static

Definition at line 39 of file wingl.c.

Referenced by OpenGLEnable(), and SetPixelFormat().

glSwapBuffers

SWAPBUFFERS glSwapBuffers = NULL

static

Definition at line 40 of file wingl.c.

Referenced by OpenGLEnable(), and SwapBuffers().

hOpenGL

HINSTANCE hOpenGL = NULL

Definition at line 47 of file wingl.c.

Referenced by OpenGLEnable(), and OpenGLInitFunction().