wgl.c

winNT技术操作系统,国外开放的原代码和LIUX一样

       ppfd->nSize != sizeof(PIXELFORMATDESCRIPTOR)) {
	SetLastError(0);
	return(FALSE);
    }
    curPFD = iPixelFormat;
    return(TRUE);
}

WINGDIAPI BOOL GLAPIENTRY wglSwapBuffers(HDC hdc)
{
    (void) hdc;
    if (ctx_current < 0)
	return FALSE;
    
    if(wgl_ctx[ctx_current].ctx == NULL) {
	SetLastError(0);
	return(FALSE);
    }
    WMesaSwapBuffers();
    return(TRUE);
}

static FIXED FixedFromDouble(double d)
{
   long l = (long) (d * 65536L);
   return *(FIXED *) (void *) &l;
}


/*
** This is cribbed from FX/fxwgl.c, and seems to implement support
** for bitmap fonts where the wglUseFontBitmapsA() code implements
** support for outline fonts.  In combination they hopefully give
** fairly generic support for fonts.
*/
static BOOL wglUseFontBitmaps_FX(HDC fontDevice, DWORD firstChar,
                                 DWORD numChars, DWORD listBase)
{
#define VERIFY(a) a
    
    TEXTMETRIC metric;
    BITMAPINFO *dibInfo;
    HDC bitDevice;
    COLORREF tempColor;
    int i;
    
    VERIFY(GetTextMetrics(fontDevice, &metric));
    
    dibInfo = (BITMAPINFO *) calloc(sizeof(BITMAPINFO) + sizeof(RGBQUAD), 1);
    dibInfo->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
    dibInfo->bmiHeader.biPlanes = 1;
    dibInfo->bmiHeader.biBitCount = 1;
    dibInfo->bmiHeader.biCompression = BI_RGB;
    
    bitDevice = CreateCompatibleDC(fontDevice);
    
    // Swap fore and back colors so the bitmap has the right polarity
    tempColor = GetBkColor(bitDevice);
    SetBkColor(bitDevice, GetTextColor(bitDevice));
    SetTextColor(bitDevice, tempColor);
    
    // Place chars based on base line
    VERIFY(SetTextAlign(bitDevice, TA_BASELINE) != GDI_ERROR ? 1 : 0);
    
    for(i = 0; i < (int)numChars; i++) {
	SIZE size;
	char curChar;
	int charWidth,charHeight,bmapWidth,bmapHeight,numBytes,res;
	HBITMAP bitObject;
	HGDIOBJ origBmap;
	unsigned char *bmap;
	
	curChar = i + firstChar;
	
	// Find how high/wide this character is
	VERIFY(GetTextExtentPoint32(bitDevice, &curChar, 1, &size));
	
	// Create the output bitmap
	charWidth = size.cx;
	charHeight = size.cy;
	// Round up to the next multiple of 32 bits
	bmapWidth = ((charWidth + 31) / 32) * 32;   
	bmapHeight = charHeight;
	bitObject = CreateCompatibleBitmap(bitDevice,
					   bmapWidth,
					   bmapHeight);
	//VERIFY(bitObject);
	
	// Assign the output bitmap to the device
	origBmap = SelectObject(bitDevice, bitObject);
	(void) VERIFY(origBmap);
	
	VERIFY( PatBlt( bitDevice, 0, 0, bmapWidth, bmapHeight,BLACKNESS ) );
	
	// Use our source font on the device
	VERIFY(SelectObject(bitDevice, GetCurrentObject(fontDevice,OBJ_FONT)));
	
	// Draw the character
	VERIFY(TextOut(bitDevice, 0, metric.tmAscent, &curChar, 1));
	
	// Unselect our bmap object
	VERIFY(SelectObject(bitDevice, origBmap));
	
	// Convert the display dependant representation to a 1 bit deep DIB
	numBytes = (bmapWidth * bmapHeight) / 8;
	bmap = malloc(numBytes);
	dibInfo->bmiHeader.biWidth = bmapWidth;
	dibInfo->bmiHeader.biHeight = bmapHeight;
	res = GetDIBits(bitDevice, bitObject, 0, bmapHeight, bmap,
			dibInfo,
			DIB_RGB_COLORS);
	//VERIFY(res);
	
	// Create the GL object
	glNewList(i + listBase, GL_COMPILE);
	glBitmap(bmapWidth, bmapHeight, 0.0, metric.tmDescent,
		 charWidth, 0.0,
		 bmap);
	glEndList();
	// CheckGL();
	
	// Destroy the bmap object
	DeleteObject(bitObject);
	
	// Deallocate the bitmap data
	free(bmap);
    }
    
    // Destroy the DC
    VERIFY(DeleteDC(bitDevice));
    
    free(dibInfo);
    
    return TRUE;
#undef VERIFY
}

WINGDIAPI BOOL GLAPIENTRY wglUseFontBitmapsA(HDC hdc, DWORD first,
					     DWORD count, DWORD listBase)
{
    int i;
    GLuint font_list;
    DWORD size;
    GLYPHMETRICS gm;
    HANDLE hBits;
    LPSTR lpBits;
    MAT2 mat;
    int  success = TRUE;
    
    if (count == 0)
	return FALSE;
    
    font_list = listBase;
    
    mat.eM11 = FixedFromDouble(1);
    mat.eM12 = FixedFromDouble(0);
    mat.eM21 = FixedFromDouble(0);
    mat.eM22 = FixedFromDouble(-1);
    
    memset(&gm,0,sizeof(gm));
    
    /*
    ** If we can't get the glyph outline, it may be because this is a fixed
    ** font.  Try processing it that way.
    */
    if( GetGlyphOutline(hdc, first, GGO_BITMAP, &gm, 0, NULL, &mat)
	== GDI_ERROR ) {
	return wglUseFontBitmaps_FX( hdc, first, count, listBase );
    }
    
    /*
    ** Otherwise process all desired characters.
    */
    for (i = 0; i < (int)count; i++) {
	DWORD err;
	
	glNewList( font_list+i, GL_COMPILE );
	
	/* allocate space for the bitmap/outline */
	size = GetGlyphOutline(hdc, first + i, GGO_BITMAP, 
			       &gm, 0, NULL, &mat);
	if (size == GDI_ERROR) {
	    glEndList( );
	    err = GetLastError();
	    success = FALSE;
	    continue;
	}
	
	hBits  = GlobalAlloc(GHND, size+1);
	lpBits = GlobalLock(hBits);
	
	err = 
	    GetGlyphOutline(hdc,         /* handle to device context */
			    first + i,   /* character to query */
			    GGO_BITMAP,  /* format of data to return */
			    &gm,         /* ptr to structure for metrics*/
			    size,        /* size of buffer for data */
			    lpBits,      /* pointer to buffer for data */
			    &mat         /* pointer to transformation */
			    /* matrix structure */
		);
	
	if (err == GDI_ERROR) {
	    GlobalUnlock(hBits);
	    GlobalFree(hBits);
	    
	    glEndList( );
	    err = GetLastError();
	    success = FALSE;
	    continue;
	}
	
	glBitmap(gm.gmBlackBoxX,gm.gmBlackBoxY,
		 -gm.gmptGlyphOrigin.x,
		 gm.gmptGlyphOrigin.y,
		 gm.gmCellIncX,gm.gmCellIncY,
		 (const GLubyte * )lpBits);
	
	GlobalUnlock(hBits);
	GlobalFree(hBits);
	
	glEndList( );
    }
    
    return success;
}



/* NOT IMPLEMENTED YET */
WINGDIAPI BOOL GLAPIENTRY wglCopyContext(HGLRC hglrcSrc,
					 HGLRC hglrcDst,
					 UINT mask)
{
    (void) hglrcSrc; (void) hglrcDst; (void) mask;
    return(FALSE);
}

WINGDIAPI HGLRC GLAPIENTRY wglCreateLayerContext(HDC hdc,
						 int iLayerPlane)
{
    (void) hdc; (void) iLayerPlane;
    SetLastError(0);
    return(NULL);
}

WINGDIAPI BOOL GLAPIENTRY wglShareLists(HGLRC hglrc1,
					HGLRC hglrc2)
{
    (void) hglrc1; (void) hglrc2;
    return(TRUE);
}


WINGDIAPI BOOL GLAPIENTRY wglUseFontBitmapsW(HDC hdc,
					     DWORD first,
					     DWORD count,
					     DWORD listBase)
{
    (void) hdc; (void) first; (void) count; (void) listBase;
    return FALSE;
}

WINGDIAPI BOOL GLAPIENTRY wglUseFontOutlinesA(HDC hdc,
					      DWORD first,
					      DWORD count,
					      DWORD listBase,
					      FLOAT deviation,
					      FLOAT extrusion,
					      int format,
					      LPGLYPHMETRICSFLOAT lpgmf)
{
    (void) hdc; (void) first; (void) count;
    (void) listBase; (void) deviation; (void) extrusion; (void) format;
    (void) lpgmf;
    SetLastError(0);
    return(FALSE);
}

WINGDIAPI BOOL GLAPIENTRY wglUseFontOutlinesW(HDC hdc,
					      DWORD first,
					      DWORD count,
					      DWORD listBase,
					      FLOAT deviation,
					      FLOAT extrusion,
					      int format,
					      LPGLYPHMETRICSFLOAT lpgmf)
{
    (void) hdc; (void) first; (void) count;
    (void) listBase; (void) deviation; (void) extrusion; (void) format;
    (void) lpgmf;
    SetLastError(0);
    return(FALSE);
}

WINGDIAPI BOOL GLAPIENTRY wglDescribeLayerPlane(HDC hdc,
						int iPixelFormat,
						int iLayerPlane,
						UINT nBytes,
						LPLAYERPLANEDESCRIPTOR plpd)
{
    (void) hdc; (void) iPixelFormat; (void) iLayerPlane; 
    (void) nBytes; (void) plpd;
    SetLastError(0);
    return(FALSE);
}

WINGDIAPI int GLAPIENTRY wglSetLayerPaletteEntries(HDC hdc,
						   int iLayerPlane,
						   int iStart,
						   int cEntries,
						   CONST COLORREF *pcr)
{
    (void) hdc; (void) iLayerPlane; (void) iStart; 
    (void) cEntries; (void) pcr;
    SetLastError(0);
    return(0);
}

WINGDIAPI int GLAPIENTRY wglGetLayerPaletteEntries(HDC hdc,
						   int iLayerPlane,
						   int iStart,
						   int cEntries,
						   COLORREF *pcr)
{
    (void) hdc; (void) iLayerPlane; (void) iStart; (void) cEntries; (void) pcr;
    SetLastError(0);
    return(0);
}

WINGDIAPI BOOL GLAPIENTRY wglRealizeLayerPalette(HDC hdc,
						 int iLayerPlane,
						 BOOL bRealize)
{
    (void) hdc; (void) iLayerPlane; (void) bRealize;
    SetLastError(0);
    return(FALSE);
}

WINGDIAPI BOOL GLAPIENTRY wglSwapLayerBuffers(HDC hdc,
					      UINT fuPlanes)
{
    (void) hdc; (void) fuPlanes;
    SetLastError(0);
    return(FALSE);
}