Initial revision

1 files changed, 2879 insertions, 0 deletions

diff --git a/src/mesa/drivers/windows/wmesaBackup.c b/src/mesa/drivers/windows/wmesaBackup.c
new file mode 100644
index 00000000000..57269fbadb0
--- /dev/null
+++ b/src/mesa/drivers/windows/wmesaBackup.c
@@ -0,0 +1,2879 @@
+/* $Id: wmesaBackup.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
+
+/*
+*   File name   :   wmesa.c
+*  Version      :   2.3
+*
+*  Display driver for Mesa 2.3  under
+*   Windows95 and WindowsNT
+*
+*   Copyright (C) 1996-  Li Wei
+*  Address      :       Institute of Artificial Intelligence
+*               :           & Robotics
+*               :       Xi'an Jiaotong University
+*  Email        :       [email protected]
+*  Web page :       http://sun.aiar.xjtu.edu.cn
+*
+*  This file and its associations are partially borrowed from the
+*  Windows NT driver for Mesa 1.8 , written by Mark Leaming
+*  ([email protected]).
+*/
+
+
+/*
+ * $Log: wmesaBackup.c,v $
+ * Revision 1.1  1999/08/19 00:55:42  jtg
+ * Initial revision
+ *
+ * Revision 1.1  1999/01/03 03:08:57  brianp
+ * Initial revision
+ *
+ * Revision 3.1  1998/06/11 01:42:08  brianp
+ * updated for Mesa 3.0 device driver interface (but not tested)
+ *
+ * Revision 3.0  1998/06/11 01:18:25  brianp
+ * initial revision
+ *
+ */
+
+
+#define WMESA_STEREO_C
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/wmesa.h>
+#include "mesa_extend.h"
+#include "colors.h"
+#include "macros.h"
+#include "context.h"
+#include "dd.h"
+#include "xform.h"
+#include "vb.h"
+#include "matrix.h"
+#include "depth.h"
+#include "wmesadef.h"
+
+#pragma warning ( disable : 4133 4761 )
+
+#ifdef PROFILE
+//  #include "profile.h"
+#endif
+
+#ifdef DITHER
+#include <wing.h>
+#endif
+
+#ifdef __CYGWIN32__
+#include "macros.h"
+#include <string.h>
+#define CopyMemory memcpy
+#endif
+
+#if !defined(NO_STEREO)
+
+#include "gl\glu.h"
+#include "stereo.h"
+
+#endif
+#if !defined(NO_PARALLEL)
+//  #include "parallel.h"
+#endif
+
+struct DISPLAY_OPTIONS displayOptions;
+
+GLenum stereoCompile = GL_FALSE ;
+GLenum stereoShowing  = GL_FALSE ;
+GLenum stereoBuffer = GL_FALSE;
+#if !defined(NO_STEREO)
+GLint displayList = MAXIMUM_DISPLAY_LIST ;
+#endif
+GLint stereo_flag = 0 ;
+
+/* end of added code*/
+
+static PWMC Current = NULL;
+WMesaContext WC = NULL;
+
+#ifdef NDEBUG
+#define assert(ignore)  ((void) 0)
+#else
+void Mesa_Assert(void *Cond,void *File,unsigned Line)
+{
+    char Msg[512];
+    sprintf(Msg,"%s %s %d",Cond,File,Line);
+    MessageBox(NULL,Msg,"Assertion failed.",MB_OK);
+    exit(1);
+}
+#define assert(e)   if (!e) Mesa_Assert(#e,__FILE__,__LINE__);
+#endif
+
+//#define DD_GETDC (Current->hDC )
+#define DD_GETDC ((Current->db_flag) ? Current->dib.hDC : Current->hDC )
+//#define DD_GETDC ((Current->db_flag) ? Current->hDCPrimary : Current->hDCBack )
+#define DD_RELEASEDC
+
+//#define BEGINGDICALL  if(Current->rgb_flag)wmFlushBits(Current);
+#define BEGINGDICALL
+//#define ENDGDICALL        if(Current->rgb_flag)wmGetBits(Current);
+#define ENDGDICALL
+
+//#define FLIP(Y)  (Current->dither_flag? Y : Current->height-(Y)-1)
+//#define FLIP(Y)  (Current->height-(Y)-1)
+//#define FLIP(Y) Y
+#define FLIP(Y)  (Current->db_flag? Y: Current->height-(Y)-1)
+#define STARTPROFILE
+#define ENDPROFILE(PARA)
+
+#define DITHER_RGB_TO_8BIT_SETUP            \
+GLubyte pixelDithered;
+
+#define DITHER_RGB_TO_8BIT(red, green, blue, pixel, scanline)               \
+{                                                                           \
+    char unsigned redtemp, greentemp, bluetemp, paletteindex;               \
+    redtemp = aDividedBy51[red]                                             \
+    + (aModulo51[red] > aHalftone8x8[(pixel%8)*8                        \
+    + scanline%8]);                                                 \
+    greentemp = aDividedBy51[(char unsigned)green]                          \
+    + (aModulo51[green] > aHalftone8x8[                             \
+    (pixel%8)*8 + scanline%8]);                                     \
+    bluetemp = aDividedBy51[(char unsigned)blue]                            \
+    + (aModulo51[blue] > aHalftone8x8[                              \
+    (pixel%8)*8 +scanline%8]);                                      \
+    paletteindex = redtemp + aTimes6[greentemp] + aTimes36[bluetemp];       \
+    pixelDithered = aWinGHalftoneTranslation[paletteindex];                 \
+}
+
+
+#ifdef DDRAW
+static BOOL DDInit( WMesaContext wc, HWND hwnd);
+static void DDFree( WMesaContext wc);
+static HRESULT DDRestoreAll( WMesaContext wc );
+static void DDDeleteOffScreen(WMesaContext wc);
+static BOOL DDCreateOffScreen(WMesaContext wc);
+#endif
+
+static void FlushToFile(PWMC pwc, PSTR  szFile);
+
+BOOL wmCreateBackingStore(PWMC pwc, long lxSize, long lySize);
+BOOL wmDeleteBackingStore(PWMC pwc);
+void wmCreatePalette( PWMC pwdc );
+BOOL wmSetDibColors(PWMC pwc);
+void wmSetPixel(PWMC pwc, int iScanLine, int iPixel, BYTE r, BYTE g, BYTE b);
+
+void wmCreateDIBSection(
+                        HDC  hDC,
+                        PWMC pwc,   // handle of device context
+                        CONST BITMAPINFO *pbmi, // address of structure containing bitmap size, format, and color data
+                        UINT iUsage // color data type indicator: RGB values or palette indices
+                        );
+
+
+void WMesaViewport( GLcontext *ctx,
+                    GLint x, GLint y, GLsizei width, GLsizei height );
+
+
+static triangle_func choose_triangle_function( GLcontext *ctx );
+
+
+static void wmSetPixelFormat( PWMC wc, HDC hDC)
+{
+    if(wc->rgb_flag)
+        wc->cColorBits = GetDeviceCaps(hDC, BITSPIXEL);
+    else
+        wc->cColorBits = 8;
+    switch(wc->cColorBits){
+    case 8:
+        if(wc->dither_flag != GL_TRUE)
+            wc->pixelformat = PF_INDEX8;
+        else
+            wc->pixelformat = PF_DITHER8;
+        break;
+    case 16:
+        wc->pixelformat = PF_5R6G5B;
+        break;
+    case 32:
+        wc->pixelformat = PF_8R8G8B;
+        break;
+    default:
+        wc->pixelformat = PF_BADFORMAT;
+    }
+}
+
+//
+// This function sets the color table of a DIB section
+// to match that of the destination DC
+//
+BOOL /*WINAPI*/ wmSetDibColors(PWMC pwc)
+{
+    RGBQUAD         *pColTab, *pRGB;
+    PALETTEENTRY    *pPal, *pPE;
+    int             i, nColors;
+    BOOL            bRet=TRUE;
+    DWORD           dwErr=0;
+
+    /* Build a color table in the DIB that maps to the
+    selected palette in the DC.
+    */
+    nColors = 1 << pwc->cColorBits;
+    pPal = (PALETTEENTRY *)malloc( nColors * sizeof(PALETTEENTRY));
+    memset( pPal, 0, nColors * sizeof(PALETTEENTRY) );
+    GetPaletteEntries( pwc->hGLPalette, 0, nColors, pPal );
+    pColTab = (RGBQUAD *)malloc( nColors * sizeof(RGBQUAD));
+    for (i = 0, pRGB = pColTab, pPE = pPal; i < nColors; i++, pRGB++, pPE++) {
+        pRGB->rgbRed = pPE->peRed;
+        pRGB->rgbGreen = pPE->peGreen;
+        pRGB->rgbBlue = pPE->peBlue;
+    }
+    if(pwc->db_flag)
+        bRet = SetDIBColorTable(pwc->dib.hDC, 0, nColors, pColTab );
+
+    if(!bRet)
+        dwErr = GetLastError();
+
+    free( pColTab );
+    free( pPal );
+
+    return(bRet);
+}
+
+
+//
+// Free up the dib section that was created
+//
+BOOL wmDeleteBackingStore(PWMC pwc)
+{
+    SelectObject(pwc->dib.hDC, pwc->hOldBitmap);
+    DeleteDC(pwc->dib.hDC);
+    DeleteObject(pwc->hbmDIB);
+    UnmapViewOfFile(pwc->dib.base);
+    CloseHandle(pwc->dib.hFileMap);
+    return TRUE;
+}
+
+
+//
+// This function creates the DIB section that is used for combined
+// GL and GDI calls
+//
+BOOL /*WINAPI*/ wmCreateBackingStore(PWMC pwc, long lxSize, long lySize)
+{
+    HDC hdc = pwc->hDC;
+    LPBITMAPINFO pbmi = &(pwc->bmi);
+    int     iUsage;
+
+    pbmi->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
+    pbmi->bmiHeader.biWidth = lxSize;
+    pbmi->bmiHeader.biHeight= -lySize;
+    pbmi->bmiHeader.biPlanes = 1;
+    if(pwc->rgb_flag)
+        pbmi->bmiHeader.biBitCount = GetDeviceCaps(pwc->hDC, BITSPIXEL);
+    else
+        pbmi->bmiHeader.biBitCount = 8;
+    pbmi->bmiHeader.biCompression = BI_RGB;
+    pbmi->bmiHeader.biSizeImage = 0;
+    pbmi->bmiHeader.biXPelsPerMeter = 0;
+    pbmi->bmiHeader.biYPelsPerMeter = 0;
+    pbmi->bmiHeader.biClrUsed = 0;
+    pbmi->bmiHeader.biClrImportant = 0;
+
+    iUsage = (pbmi->bmiHeader.biBitCount <= 8) ? DIB_PAL_COLORS : DIB_RGB_COLORS;
+
+    pwc->cColorBits = pbmi->bmiHeader.biBitCount;
+    pwc->ScanWidth = pwc->pitch = lxSize;
+
+    wmCreateDIBSection(hdc, pwc, pbmi, iUsage);
+
+    if ((iUsage == DIB_PAL_COLORS) && !(pwc->hGLPalette)) {
+        wmCreatePalette( pwc );
+        wmSetDibColors( pwc );
+    }
+    wmSetPixelFormat(pwc, pwc->hDC);
+    return(TRUE);
+
+}
+
+
+//
+// This function copies one scan line in a DIB section to another
+//
+BOOL GLWINAPI wmSetDIBits(PWMC pwc, UINT uiScanWidth, UINT uiNumScans, UINT nBypp, UINT uiNewWidth, LPBYTE pBits)
+{
+    UINT uiScans = 0;
+    LPBYTE  pDest = pwc->pbPixels;
+    DWORD   dwNextScan = uiScanWidth;
+    DWORD   dwNewScan = uiNewWidth;
+    DWORD   dwScanWidth = (uiScanWidth * nBypp);
+
+    //
+    // We need to round up to the nearest DWORD
+    // and multiply by the number of bytes per
+    // pixel
+    //
+    dwNextScan = (((dwNextScan * nBypp)+ 3) & ~3);
+    dwNewScan = (((dwNewScan * nBypp)+ 3) & ~3);
+
+    for(uiScans = 0; uiScans < uiNumScans; uiScans++){
+        CopyMemory(pDest, pBits, dwScanWidth);
+        pBits += dwNextScan;
+        pDest += dwNewScan;
+    }
+
+    return(TRUE);
+
+}
+
+
+BOOL wmFlush(PWMC pwc);
+
+/*
+* Useful macros:
+Modified from file osmesa.c
+*/
+
+
+#define PIXELADDR(X,Y)  ((GLubyte *)Current->pbPixels + (Current->height-Y-1)* Current->ScanWidth + (X)*nBypp)
+#define PIXELADDR1( X, Y )  \
+((GLubyte *)wmesa->pbPixels + (wmesa->height-Y-1)* wmesa->ScanWidth + (X))
+#define PIXELADDR2( X, Y )  \
+((GLubyte *)wmesa->pbPixels + (wmesa->height-Y-1)* wmesa->ScanWidth + (X)*2)
+#define PIXELADDR4( X, Y )  \
+((GLubyte *)wmesa->pbPixels + (wmesa->height-Y-1)* wmesa->ScanWidth + (X)*4)
+
+
+BYTE DITHER_RGB_2_8BIT( int r, int g, int b, int x, int y);
+
+/* Finish all pending operations and synchronize. */
+static void finish(GLcontext* ctx)
+{
+    /* No op */
+}
+
+
+//
+// We cache all gl draw routines until a flush is made
+//
+static void flush(GLcontext* ctx)
+{
+    STARTPROFILE
+        if((Current->rgb_flag /*&& !(Current->dib.fFlushed)*/&&!(Current->db_flag))
+            ||(!Current->rgb_flag))
+        {
+            wmFlush(Current);
+        }
+        ENDPROFILE(flush)
+
+}
+
+
+
+/*
+* Set the color index used to clear the color buffer.
+*/
+static void clear_index(GLcontext* ctx, GLuint index)
+{
+    STARTPROFILE
+        Current->clearpixel = index;
+    ENDPROFILE(clear_index)
+}
+
+
+
+/*
+* Set the color used to clear the color buffer.
+*/
+static void clear_color( GLcontext* ctx, GLubyte r, GLubyte g, GLubyte b, GLubyte a )
+{
+    STARTPROFILE
+        Current->clearpixel=RGB(r, g, b );
+    ENDPROFILE(clear_color)
+}
+
+
+
+/*
+* Clear the specified region of the color buffer using the clear color
+* or index as specified by one of the two functions above.
+*/
+//static void clear(GLcontext* ctx,
+//                  GLboolean all,GLint x, GLint y, GLint width, GLint height )
+// TODO: I modified this function to match the prototype in dd.h. ([email protected])
+//       dd.h does not explain what the return type is so I could not set this to the proper
+//       value.
+static GLbitfield clear(GLcontext* ctx, GLbitfield mask,
+                  GLboolean all, GLint x, GLint y, GLint width, GLint height)
+{
+    DWORD   dwColor;
+    WORD    wColor;
+    BYTE    bColor;
+    LPDWORD lpdw = (LPDWORD)Current->pbPixels;
+    LPWORD  lpw = (LPWORD)Current->pbPixels;
+    LPBYTE  lpb = Current->pbPixels;
+    int     lines;
+
+    STARTPROFILE
+
+        if (all){
+            x=y=0;
+            width=Current->width;
+            height=Current->height;
+        }
+        if(Current->db_flag==GL_TRUE){
+            UINT    nBypp = Current->cColorBits / 8;
+            int     i = 0;
+            int     iSize = 0;
+
+            if(nBypp ==1 ){
+                /* Need rectification */
+                iSize = Current->width/4;
+                bColor  = BGR8(GetRValue(Current->clearpixel),
+                    GetGValue(Current->clearpixel),
+                    GetBValue(Current->clearpixel));
+                wColor  = MAKEWORD(bColor,bColor);
+                dwColor = MAKELONG(wColor, wColor);
+            }
+            if(nBypp == 2){
+                iSize = Current->width / 2;
+                wColor = BGR16(GetRValue(Current->clearpixel),
+                    GetGValue(Current->clearpixel),
+                    GetBValue(Current->clearpixel));
+                dwColor = MAKELONG(wColor, wColor);
+            }
+            else if(nBypp == 4){
+                iSize = Current->width;
+                dwColor = BGR32(GetRValue(Current->clearpixel),
+                    GetGValue(Current->clearpixel),
+                    GetBValue(Current->clearpixel));
+            }
+
+            while(i < iSize){
+                *lpdw = dwColor;
+                lpdw++;
+                i++;
+            }
+
+            //
+            // This is the 24bit case
+            //
+            if (nBypp == 3) {
+                iSize = Current->width *3/4;
+                dwColor = BGR24(GetRValue(Current->clearpixel),
+                    GetGValue(Current->clearpixel),
+                    GetBValue(Current->clearpixel));
+                while(i < iSize){
+                    *lpdw = dwColor;
+                    lpb += nBypp;
+                    lpdw = (LPDWORD)lpb;
+                    i++;
+                }
+            }
+
+            i = 0;
+            if (stereo_flag)
+               lines = height /2;
+            else
+               lines = height;
+            do {
+                memcpy(lpb, Current->pbPixels, iSize*4);
+                lpb += Current->ScanWidth;
+                i++;
+            }
+            while (i<lines-1);
+        }
+        else { // For single buffer
+            HDC DC=DD_GETDC;
+            HPEN Pen=CreatePen(PS_SOLID,1,Current->clearpixel);
+            HBRUSH Brush=CreateSolidBrush(Current->clearpixel);
+            HPEN Old_Pen=SelectObject(DC,Pen);
+            HBRUSH Old_Brush=SelectObject(DC,Brush);
+            Rectangle(DC,x,y,x+width,y+height);
+            SelectObject(DC,Old_Pen);
+            SelectObject(DC,Old_Brush);
+            DeleteObject(Pen);
+            DeleteObject(Brush);
+            DD_RELEASEDC;
+        }
+
+
+
+        ENDPROFILE(clear)
+
+		return mask;	// TODO: I doubt this is correct. dd.h doesn't explain what this should
+		                //       be...
+}
+
+
+
+/* Set the current color index. */
+static void set_index(GLcontext* ctx, GLuint index)
+{
+    STARTPROFILE
+        Current->pixel=index;
+    ENDPROFILE(set_index)
+}
+
+
+
+/* Set the current RGBA color. */
+static void set_color( GLcontext* ctx, GLubyte r, GLubyte g, GLubyte b, GLubyte a )
+{
+    STARTPROFILE
+        Current->pixel = RGB( r, g, b );
+    ENDPROFILE(set_color)
+}
+
+
+
+/* Set the index mode bitplane mask. */
+static GLboolean index_mask(GLcontext* ctx, GLuint mask)
+{
+    /* can't implement */
+    return GL_FALSE;
+}
+
+
+
+/* Set the RGBA drawing mask. */
+static GLboolean color_mask( GLcontext* ctx,
+                            GLboolean rmask, GLboolean gmask,
+                            GLboolean bmask, GLboolean amask)
+{
+    /* can't implement */
+    return GL_FALSE;
+}
+
+
+
+/*
+* Set the pixel logic operation.  Return GL_TRUE if the device driver
+* can perform the operation, otherwise return GL_FALSE.  If GL_FALSE
+* is returned, the logic op will be done in software by Mesa.
+*/
+GLboolean logicop( GLcontext* ctx, GLenum op )
+{
+    /* can't implement */
+    return GL_FALSE;
+}
+
+
+static void dither( GLcontext* ctx, GLboolean enable )
+{
+    if(enable == GL_FALSE){
+        Current->dither_flag = GL_FALSE;
+        if(Current->cColorBits == 8)
+            Current->pixelformat = PF_INDEX8;
+    }
+    else{
+        if (Current->rgb_flag && Current->cColorBits == 8){
+            Current->pixelformat = PF_DITHER8;
+            Current->dither_flag = GL_TRUE;
+        }
+        else
+            Current->dither_flag = GL_FALSE;
+    }
+}
+
+
+
+static GLboolean set_buffer( GLcontext* ctx, GLenum mode )
+{
+   STARTPROFILE
+   /* TODO: this could be better */
+   if (mode==GL_FRONT || mode==GL_BACK) {
+      return GL_TRUE;
+   }
+   else {
+      return GL_FALSE;
+   }
+   ENDPROFILE(set_buffer)
+}
+
+
+
+/* Return characteristics of the output buffer. */
+static void buffer_size( GLcontext* ctx, GLuint *width, GLuint *height )
+{
+   int New_Size;
+   RECT CR;
+
+   STARTPROFILE
+   GetClientRect(Current->Window,&CR);
+
+   *width=CR.right;
+   *height=CR.bottom;
+
+   New_Size=((*width)!=Current->width) || ((*height)!=Current->height);
+
+   if (New_Size){
+      Current->width=*width;
+      Current->height=*height;
+      Current->ScanWidth=Current->width;
+      if ((Current->ScanWidth%sizeof(long))!=0)
+         Current->ScanWidth+=(sizeof(long)-(Current->ScanWidth%sizeof(long)));
+
+      if (Current->db_flag){
+#ifdef DDRAW
+         DDDeleteOffScreen(Current);
+         DDCreateOffScreen(Current);
+#else
+         if (Current->rgb_flag==GL_TRUE && Current->dither_flag!=GL_TRUE){
+            wmDeleteBackingStore(Current);
+            wmCreateBackingStore(Current, Current->width, Current->height);
+         }
+#endif
+      }
+
+      //  Resize OsmesaBuffer if in Parallel mode
+#if !defined(NO_PARALLEL)
+      if(parallelFlag)
+         PRSizeRenderBuffer(Current->width, Current->height,Current->ScanWidth,
+                            Current->rgb_flag == GL_TRUE ? Current->pbPixels: Current->ScreenMem);
+#endif
+   }
+   ENDPROFILE(buffer_size)
+}
+
+
+
+/**********************************************************************/
+/*****           Accelerated point, line, polygon rendering       *****/
+/**********************************************************************/
+
+
+static void fast_rgb_points( GLcontext* ctx, GLuint first, GLuint last )
+{
+    GLuint i;
+    //  HDC DC=DD_GETDC;
+    PWMC    pwc = Current;
+
+    STARTPROFILE
+
+        if (Current->gl_ctx->VB->MonoColor) {
+            /* all drawn with current color */
+            for (i=first;i<=last;i++) {
+                if (!Current->gl_ctx->VB->ClipMask[i]) {
+                    int x, y;
+                    x =       (GLint) Current->gl_ctx->VB->Win[i][0];
+                    y = FLIP( (GLint) Current->gl_ctx->VB->Win[i][1] );
+                    wmSetPixel(pwc, y,x,GetRValue(Current->pixel),
+                        GetGValue(Current->pixel), GetBValue(Current->pixel));
+                }
+            }
+        }
+        else {
+            /* draw points of different colors */
+            for (i=first;i<=last;i++) {
+                if (!Current->gl_ctx->VB->ClipMask[i]) {
+                    int x, y;
+                    unsigned long pixel=RGB(Current->gl_ctx->VB->Color[i][0]*255.0,
+                        Current->gl_ctx->VB->Color[i][1]*255.0,
+                        Current->gl_ctx->VB->Color[i][2]*255.0);
+                    x =       (GLint) Current->gl_ctx->VB->Win[i][0];
+                    y = FLIP( (GLint) Current->gl_ctx->VB->Win[i][1] );
+                    wmSetPixel(pwc, y,x,Current->gl_ctx->VB->Color[i][0]*255.0,
+                        Current->gl_ctx->VB->Color[i][1]*255.0,
+                        Current->gl_ctx->VB->Color[i][2]*255.0);
+                }
+            }
+        }
+        //   DD_RELEASEDC;
+        ENDPROFILE(fast_rgb_points)
+}
+
+
+
+/* Return pointer to accerated points function */
+extern points_func choose_points_function( GLcontext* ctx )
+{
+    STARTPROFILE
+        if (ctx->Point.Size==1.0 && !ctx->Point.SmoothFlag && ctx->RasterMask==0
+            && !ctx->Texture.Enabled  && ctx->Visual->RGBAflag) {
+            ENDPROFILE(choose_points_function)
+                return fast_rgb_points;
+        }
+        else {
+            ENDPROFILE(choose_points_function)
+                return NULL;
+        }
+}
+
+
+
+/* Draw a line using the color specified by Current->gl_ctx->VB->Color[pv] */
+static void fast_flat_rgb_line( GLcontext* ctx, GLuint v0, GLuint v1, GLuint pv )
+{
+    STARTPROFILE
+        int x0, y0, x1, y1;
+    unsigned long pixel;
+    HDC DC=DD_GETDC;
+    HPEN Pen;
+    HPEN Old_Pen;
+
+    if (Current->gl_ctx->VB->MonoColor) {
+        pixel = Current->pixel;  /* use current color */
+    }
+    else {
+        pixel = RGB(Current->gl_ctx->VB->Color[pv][0]*255.0, Current->gl_ctx->VB->Color[pv][1]*255.0, Current->gl_ctx->VB->Color[pv][2]*255.0);
+    }
+
+    x0 =       (int) Current->gl_ctx->VB->Win[v0][0];
+    y0 = FLIP( (int) Current->gl_ctx->VB->Win[v0][1] );
+    x1 =       (int) Current->gl_ctx->VB->Win[v1][0];
+    y1 = FLIP( (int) Current->gl_ctx->VB->Win[v1][1] );
+
+
+    BEGINGDICALL
+
+    Pen=CreatePen(PS_SOLID,1,pixel);
+    Old_Pen=SelectObject(DC,Pen);
+    MoveToEx(DC,x0,y0,NULL);
+    LineTo(DC,x1,y1);
+    SelectObject(DC,Old_Pen);
+    DeleteObject(Pen);
+    DD_RELEASEDC;
+
+    ENDGDICALL
+
+    ENDPROFILE(fast_flat_rgb_line)
+}
+
+
+
+/* Return pointer to accerated line function */
+static line_func choose_line_function( GLcontext* ctx )
+{
+    STARTPROFILE
+    if (ctx->Line.Width==1.0 && !ctx->Line.SmoothFlag && !ctx->Line.StippleFlag
+        && ctx->Light.ShadeModel==GL_FLAT && ctx->RasterMask==0
+        && !ctx->Texture.Enabled && Current->rgb_flag) {
+       ENDPROFILE(choose_line_function)
+       return fast_flat_rgb_line;
+    }
+    else {
+       ENDPROFILE(choose_line_function)
+       return NULL;
+    }
+}
+
+
+/**********************************************************************/
+/*****                 Span-based pixel drawing                   *****/
+/**********************************************************************/
+
+
+/* Write a horizontal span of 32-bit color-index pixels with a boolean mask. */
+static void write_ci32_span( const GLcontext* ctx,
+                             GLuint n, GLint x, GLint y,
+                             const GLuint index[],
+                             const GLubyte mask[] )
+{
+    STARTPROFILE
+    GLuint i;
+    PBYTE Mem=Current->ScreenMem+FLIP(y)*Current->ScanWidth+x;
+    assert(Current->rgb_flag==GL_FALSE);
+    for (i=0; i<n; i++)
+        if (mask[i])
+            Mem[i]=index[i];
+    ENDPROFILE(write_ci32_span)
+}
+
+
+/* Write a horizontal span of 8-bit color-index pixels with a boolean mask. */
+static void write_ci8_span( const GLcontext* ctx,
+                            GLuint n, GLint x, GLint y,
+                            const GLubyte index[],
+                            const GLubyte mask[] )
+{
+    STARTPROFILE
+    GLuint i;
+    PBYTE Mem=Current->ScreenMem+FLIP(y)*Current->ScanWidth+x;
+    assert(Current->rgb_flag==GL_FALSE);
+    for (i=0; i<n; i++)
+        if (mask[i])
+            Mem[i]=index[i];
+    ENDPROFILE(write_ci8_span)
+}
+
+
+
+/*
+* Write a horizontal span of pixels with a boolean mask.  The current
+* color index is used for all pixels.
+*/
+static void write_mono_ci_span(const GLcontext* ctx,
+                               GLuint n,GLint x,GLint y,
+                               const GLubyte mask[])
+{
+   STARTPROFILE
+   GLuint i;
+   BYTE *Mem=Current->ScreenMem+FLIP(y)*Current->ScanWidth+x;
+   assert(Current->rgb_flag==GL_FALSE);
+   for (i=0; i<n; i++)
+      if (mask[i])
+         Mem[i]=Current->pixel;
+   ENDPROFILE(write_mono_ci_span)
+}
+
+/*
+ * To improve the performance of this routine, frob the data into an actual
+ * scanline and call bitblt on the complete scan line instead of SetPixel.
+ */
+
+/* Write a horizontal span of RGBA color pixels with a boolean mask. */
+static void write_rgba_span( const GLcontext* ctx, GLuint n, GLint x, GLint y,
+                             const GLubyte rgba[][4], const GLubyte mask[] )
+{
+    STARTPROFILE
+    PWMC    pwc = Current;
+
+    if (pwc->rgb_flag==GL_TRUE)
+    {
+        GLuint i;
+        HDC DC=DD_GETDC;
+        y=FLIP(y);
+        if (mask) {
+            for (i=0; i<n; i++)
+                if (mask[i])
+                    wmSetPixel(pwc, y, x + i, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]);
+        }
+        else {
+            for (i=0; i<n; i++)
+                wmSetPixel(pwc, y, x + i, rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP] );
+        }
+        DD_RELEASEDC;
+    }
+    else
+    {
+        GLuint i;
+        BYTE *Mem=Current->ScreenMem+y*Current->ScanWidth+x;
+        y = FLIP(y);
+        if (mask) {
+            for (i=0; i<n; i++)
+                if (mask[i])
+                    Mem[i] = GetNearestPaletteIndex(Current->hPal,RGB(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]));
+        }
+        else {
+            for (i=0; i<n; i++)
+                Mem[i] = GetNearestPaletteIndex(Current->hPal,RGB(rgba[i][RCOMP], rgba[i][GCOMP], rgba[i][BCOMP]));
+        }
+    }
+    ENDPROFILE(write_rgba_span)
+
+}
+
+/* Write a horizontal span of RGB color pixels with a boolean mask. */
+static void write_rgb_span( const GLcontext* ctx,
+                            GLuint n, GLint x, GLint y,
+                            const GLubyte rgb[][3], const GLubyte mask[] )
+{
+    STARTPROFILE
+    PWMC    pwc = Current;
+
+    if (pwc->rgb_flag==GL_TRUE)
+    {
+        GLuint i;
+        HDC DC=DD_GETDC;
+        y=FLIP(y);
+        if (mask) {
+            for (i=0; i<n; i++)
+                if (mask[i])
+                    wmSetPixel(pwc, y, x + i, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]);
+        }
+        else {
+            for (i=0; i<n; i++)
+                wmSetPixel(pwc, y, x + i, rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP] );
+        }
+        DD_RELEASEDC;
+    }
+    else
+    {
+        GLuint i;
+        BYTE *Mem=Current->ScreenMem+y*Current->ScanWidth+x;
+        y = FLIP(y);
+        if (mask) {
+            for (i=0; i<n; i++)
+                if (mask[i])
+                    Mem[i] = GetNearestPaletteIndex(Current->hPal,RGB(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]));
+        }
+        else {
+            for (i=0; i<n; i++)
+                Mem[i] = GetNearestPaletteIndex(Current->hPal,RGB(rgb[i][RCOMP], rgb[i][GCOMP], rgb[i][BCOMP]));
+        }
+    }
+    ENDPROFILE(write_rgb_span)
+
+}
+
+/*
+* Write a horizontal span of pixels with a boolean mask.  The current color
+* is used for all pixels.
+*/
+static void write_mono_rgba_span( const GLcontext* ctx,
+                                  GLuint n, GLint x, GLint y,
+                                  const GLubyte mask[])
+{
+    STARTPROFILE
+    GLuint i;
+    HDC DC=DD_GETDC;
+    PWMC pwc = Current;
+    assert(Current->rgb_flag==GL_TRUE);
+    y=FLIP(y);
+    if(Current->rgb_flag==GL_TRUE){
+        for (i=0; i<n; i++)
+            if (mask[i])
+                // Trying
+                wmSetPixel(pwc,y,x+i,GetRValue(Current->pixel), GetGValue(Current->pixel), GetBValue(Current->pixel));
+    }
+    else {
+        for (i=0; i<n; i++)
+            if (mask[i])
+                SetPixel(DC, y, x+i, Current->pixel);
+    }
+    DD_RELEASEDC;
+    ENDPROFILE(write_mono_rgba_span)
+}
+
+
+
+/**********************************************************************/
+/*****                   Array-based pixel drawing                *****/
+/**********************************************************************/
+
+
+/* Write an array of 32-bit index pixels with a boolean mask. */
+static void write_ci32_pixels( const GLcontext* ctx,
+                               GLuint n, const GLint x[], const GLint y[],
+                               const GLuint index[], const GLubyte mask[] )
+{
+   STARTPROFILE
+   GLuint i;
+   assert(Current->rgb_flag==GL_FALSE);
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         BYTE *Mem=Current->ScreenMem+FLIP(y[i])*Current->ScanWidth+x[i];
+         *Mem = index[i];
+      }
+   }
+   ENDPROFILE(write_ci32_pixels)
+}
+
+
+
+/*
+* Write an array of pixels with a boolean mask.  The current color
+* index is used for all pixels.
+*/
+static void write_mono_ci_pixels( const GLcontext* ctx,
+                                  GLuint n,
+                                  const GLint x[], const GLint y[],
+                                  const GLubyte mask[] )
+{
+   STARTPROFILE
+   GLuint i;
+   assert(Current->rgb_flag==GL_FALSE);
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         BYTE *Mem=Current->ScreenMem+FLIP(y[i])*Current->ScanWidth+x[i];
+         *Mem = Current->pixel;
+      }
+   }
+   ENDPROFILE(write_mono_ci_pixels)
+}
+
+
+
+/* Write an array of RGBA pixels with a boolean mask. */
+static void write_rgba_pixels( const GLcontext* ctx,
+                               GLuint n, const GLint x[], const GLint y[],
+                               const GLubyte rgba[][4], const GLubyte mask[] )
+{
+    STARTPROFILE
+        GLuint i;
+    PWMC    pwc = Current;
+    HDC DC=DD_GETDC;
+    assert(Current->rgb_flag==GL_TRUE);
+    for (i=0; i<n; i++)
+       if (mask[i])
+          wmSetPixel(pwc, FLIP(y[i]),x[i],rgba[i][RCOMP],rgba[i][GCOMP],rgba[i][BCOMP]);
+    DD_RELEASEDC;
+    ENDPROFILE(write_rgba_pixels)
+}
+
+
+
+/*
+* Write an array of pixels with a boolean mask.  The current color
+* is used for all pixels.
+*/
+static void write_mono_rgba_pixels( const GLcontext* ctx,
+                                    GLuint n,
+                                    const GLint x[], const GLint y[],
+                                    const GLubyte mask[] )
+{
+    STARTPROFILE
+    GLuint i;
+    PWMC    pwc = Current;
+    HDC DC=DD_GETDC;
+    assert(Current->rgb_flag==GL_TRUE);
+    for (i=0; i<n; i++)
+        if (mask[i])
+            wmSetPixel(pwc, FLIP(y[i]),x[i],GetRValue(Current->pixel),
+                       GetGValue(Current->pixel), GetBValue(Current->pixel));
+    DD_RELEASEDC;
+    ENDPROFILE(write_mono_rgba_pixels)
+}
+
+
+
+/**********************************************************************/
+/*****            Read spans/arrays of pixels                     *****/
+/**********************************************************************/
+
+
+/* Read a horizontal span of color-index pixels. */
+static void read_ci32_span( const GLcontext* ctx, GLuint n, GLint x, GLint y,
+                            GLuint index[])
+{
+   STARTPROFILE
+   GLuint i;
+   BYTE *Mem=Current->ScreenMem+FLIP(y)*Current->ScanWidth+x;
+   assert(Current->rgb_flag==GL_FALSE);
+   for (i=0; i<n; i++)
+      index[i]=Mem[i];
+   ENDPROFILE(read_ci32_span)
+}
+
+
+
+
+/* Read an array of color index pixels. */
+static void read_ci32_pixels( const GLcontext* ctx,
+                              GLuint n, const GLint x[], const GLint y[],
+                              GLuint indx[], const GLubyte mask[] )
+{
+   STARTPROFILE
+   GLuint i;
+   assert(Current->rgb_flag==GL_FALSE);
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         indx[i]=*(Current->ScreenMem+FLIP(y[i])*Current->ScanWidth+x[i]);
+      }
+   }
+   ENDPROFILE(read_ci32_pixels)
+}
+
+
+
+/* Read a horizontal span of color pixels. */
+static void read_rgba_span( const GLcontext* ctx,
+                            GLuint n, GLint x, GLint y,
+                            GLubyte rgba[][4] )
+{
+   STARTPROFILE
+   UINT i;
+   COLORREF Color;
+   HDC DC=DD_GETDC;
+   assert(Current->rgb_flag==GL_TRUE);
+   y=FLIP(y);
+   for (i=0; i<n; i++) {
+      Color=GetPixel(DC,x+i,y);
+      rgba[i][RCOMP] = GetRValue(Color);
+      rgba[i][GCOMP] = GetGValue(Color);
+      rgba[i][BCOMP] = GetBValue(Color);
+      rgba[i][ACOMP] = 255;
+   }
+   DD_RELEASEDC;
+// Brian P. Has mentioned to comment this out.
+//   memset(alpha,0,n*sizeof(GLubyte));
+   ENDPROFILE(read_rgba_span)
+}
+
+
+/* Read an array of color pixels. */
+static void read_rgba_pixels( const GLcontext* ctx,
+                              GLuint n, const GLint x[], const GLint y[],
+                              GLubyte rgba[][4], const GLubyte mask[] )
+{
+   STARTPROFILE
+   GLuint i;
+   COLORREF Color;
+   HDC DC=DD_GETDC;
+   assert(Current->rgb_flag==GL_TRUE);
+   for (i=0; i<n; i++) {
+      if (mask[i]) {
+         Color=GetPixel(DC,x[i],FLIP(y[i]));
+         rgba[i][RCOMP] = GetRValue(Color);
+         rgba[i][GCOMP] = GetGValue(Color);
+         rgba[i][BCOMP] = GetBValue(Color);
+         rgba[i][ACOMP] = 255;
+      }
+   }
+   DD_RELEASEDC;
+// Brian P. has mentioned to comment this out.
+//   memset(alpha,0,n*sizeof(GLint));
+   ENDPROFILE(read_rgba_pixels)
+}
+
+
+
+/**********************************************************************/
+/**********************************************************************/
+
+
+static const char *renderer_string(void)
+{
+   return "Windows";
+}
+
+
+
+void setup_DD_pointers( GLcontext* ctx )
+{
+    ctx->Driver.RendererString = renderer_string;
+    ctx->Driver.UpdateState = setup_DD_pointers;
+    ctx->Driver.GetBufferSize = buffer_size;
+    ctx->Driver.Finish = finish;
+    ctx->Driver.Flush = flush;
+
+    ctx->Driver.ClearIndex = clear_index;
+    ctx->Driver.ClearColor = clear_color;
+    ctx->Driver.Clear = clear;
+
+    ctx->Driver.Index = set_index;
+    ctx->Driver.Color = set_color;
+    ctx->Driver.IndexMask = index_mask;
+    ctx->Driver.ColorMask = color_mask;
+
+    ctx->Driver.LogicOp = logicop;
+    ctx->Driver.Dither = dither;
+
+    ctx->Driver.SetBuffer = set_buffer;
+    ctx->Driver.GetBufferSize = buffer_size;
+
+    ctx->Driver.PointsFunc = choose_points_function(ctx);
+    ctx->Driver.LineFunc = choose_line_function(ctx);
+    ctx->Driver.TriangleFunc = choose_triangle_function( ctx );
+
+    /* Pixel/span writing functions: */
+	ctx->Driver.WriteRGBASpan        = write_rgba_span;
+    ctx->Driver.WriteRGBSpan         = write_rgb_span;
+    ctx->Driver.WriteMonoRGBASpan    = write_mono_rgba_span;
+    ctx->Driver.WriteRGBAPixels      = write_rgba_pixels;
+    ctx->Driver.WriteMonoRGBAPixels  = write_mono_rgba_pixels;
+    ctx->Driver.WriteCI32Span        = write_ci32_span;
+    ctx->Driver.WriteCI8Span         = write_ci8_span;
+    ctx->Driver.WriteMonoCISpan      = write_mono_ci_span;
+    ctx->Driver.WriteCI32Pixels      = write_ci32_pixels;
+    ctx->Driver.WriteMonoCIPixels    = write_mono_ci_pixels;
+
+    ctx->Driver.ReadCI32Span        = read_ci32_span;
+    ctx->Driver.ReadRGBASpan        = read_rgba_span;
+    ctx->Driver.ReadCI32Pixels      = read_ci32_pixels;
+    ctx->Driver.ReadRGBAPixels      = read_rgba_pixels;
+}
+
+
+/**********************************************************************/
+/*****                  WMesa API Functions                       *****/
+/**********************************************************************/
+
+
+
+#define PAL_SIZE 256
+static void GetPalette(HPALETTE Pal,RGBQUAD *aRGB)
+{
+    STARTPROFILE
+        int i;
+    HDC hdc;
+    struct
+    {
+        WORD Version;
+        WORD NumberOfEntries;
+        PALETTEENTRY aEntries[PAL_SIZE];
+    } Palette =
+    {
+        0x300,
+            PAL_SIZE
+    };
+    hdc=GetDC(NULL);
+    if (Pal!=NULL)
+        GetPaletteEntries(Pal,0,PAL_SIZE,Palette.aEntries);
+    else
+        GetSystemPaletteEntries(hdc,0,PAL_SIZE,Palette.aEntries);
+    if (GetSystemPaletteUse(hdc) == SYSPAL_NOSTATIC)
+    {
+        for(i = 0; i <PAL_SIZE; i++)
+            Palette.aEntries[i].peFlags = PC_RESERVED;
+        Palette.aEntries[255].peRed = 255;
+        Palette.aEntries[255].peGreen = 255;
+        Palette.aEntries[255].peBlue = 255;
+        Palette.aEntries[255].peFlags = 0;
+        Palette.aEntries[0].peRed = 0;
+        Palette.aEntries[0].peGreen = 0;
+        Palette.aEntries[0].peBlue = 0;
+        Palette.aEntries[0].peFlags = 0;
+    }
+    else
+    {
+        int nStaticColors;
+        int nUsableColors;
+        nStaticColors = GetDeviceCaps(hdc, NUMCOLORS)/2;
+        for (i=0; i<nStaticColors; i++)
+            Palette.aEntries[i].peFlags = 0;
+        nUsableColors = PAL_SIZE-nStaticColors;
+        for (; i<nUsableColors; i++)
+            Palette.aEntries[i].peFlags = PC_RESERVED;
+        for (; i<PAL_SIZE-nStaticColors; i++)
+            Palette.aEntries[i].peFlags = PC_RESERVED;
+        for (i=PAL_SIZE-nStaticColors; i<PAL_SIZE; i++)
+            Palette.aEntries[i].peFlags = 0;
+    }
+    ReleaseDC(NULL,hdc);
+    for (i=0; i<PAL_SIZE; i++)
+    {
+        aRGB[i].rgbRed=Palette.aEntries[i].peRed;
+        aRGB[i].rgbGreen=Palette.aEntries[i].peGreen;
+        aRGB[i].rgbBlue=Palette.aEntries[i].peBlue;
+        aRGB[i].rgbReserved=Palette.aEntries[i].peFlags;
+    }
+    ENDPROFILE(GetPalette)
+}
+
+
+WMesaContext WMesaCreateContext( HWND hWnd,
+											HPALETTE* Pal,
+											GLboolean rgb_flag,
+											GLboolean db_flag )
+{
+    RECT CR;
+    WMesaContext c;
+    GLboolean true_color_flag;
+    c = (struct wmesa_context * ) calloc(1,sizeof(struct wmesa_context));
+    if (!c)
+        return NULL;
+
+    c->Window=hWnd;
+    c->hDC = GetDC(hWnd);
+    true_color_flag = GetDeviceCaps(c->hDC, BITSPIXEL) > 8;
+#ifdef DDRAW
+    if(true_color_flag) c->rgb_flag = rgb_flag = GL_TRUE;
+#endif
+
+
+#ifdef DITHER
+    if ((true_color_flag==GL_FALSE) && (rgb_flag == GL_TRUE)){
+        c->dither_flag = GL_TRUE;
+        c->hPalHalfTone = WinGCreateHalftonePalette();
+    }
+    else
+        c->dither_flag = GL_FALSE;
+#else
+    c->dither_flag = GL_FALSE;
+#endif
+
+
+    if (rgb_flag==GL_FALSE)
+    {
+        c->rgb_flag = GL_FALSE;
+        //    c->pixel = 1;
+        c->db_flag = db_flag =GL_TRUE; // WinG requires double buffering
+        printf("Single buffer is not supported in color index mode, setting to double buffer.\n");
+    }
+    else
+    {
+        c->rgb_flag = GL_TRUE;
+        //    c->pixel = 0;
+    }
+    GetClientRect(c->Window,&CR);
+    c->width=CR.right;
+    c->height=CR.bottom;
+    if (db_flag)
+    {
+        c->db_flag = 1;
+        /* Double buffered */
+#ifndef DDRAW
+        //  if (c->rgb_flag==GL_TRUE && c->dither_flag != GL_TRUE )
+        {
+            wmCreateBackingStore(c, c->width, c->height);
+
+        }
+#endif
+    }
+    else
+    {
+        /* Single Buffered */
+        if (c->rgb_flag)
+            c->db_flag = 0;
+    }
+#ifdef DDRAW
+    if (DDInit(c,hWnd) == GL_FALSE) {
+        free( (void *) c );
+        exit(1);
+    }
+#endif
+
+
+    c->gl_visual = gl_create_visual(rgb_flag,
+                                    GL_FALSE,   /* software alpha */
+                                    db_flag,    /* db_flag */
+                                    GL_FALSE,   /* stereo */
+                                    16,         /* depth_bits */
+                                    8,          /* stencil_bits */
+                                    8,          /* accum_bits */
+                                    0,          /* index bits */
+                                    8,8,8,8 );  /* r, g, b, a bits */
+
+    if (!c->gl_visual) {
+        return NULL;
+    }
+
+    /* allocate a new Mesa context */
+    c->gl_ctx = gl_create_context( c->gl_visual, NULL, c, GL_TRUE);
+
+    if (!c->gl_ctx) {
+        gl_destroy_visual( c->gl_visual );
+        free(c);
+        return NULL;
+    }
+
+    c->gl_buffer = gl_create_framebuffer( c->gl_visual );
+    if (!c->gl_buffer) {
+        gl_destroy_visual( c->gl_visual );
+        gl_destroy_context( c->gl_ctx );
+        free(c);
+        return NULL;
+    }

+

+	c->gl_ctx->Driver.UpdateState = setup_DD_pointers;

+
+    //  setup_DD_pointers(c->gl_ctx);
+
+    return c;
+}
+
+void WMesaDestroyContext( void )
+{
+    WMesaContext c = Current;
+    ReleaseDC(c->Window,c->hDC);
+    WC = c;
+    if(c->hPalHalfTone != NULL)
+        DeleteObject(c->hPalHalfTone);
+    gl_destroy_visual( c->gl_visual );
+    gl_destroy_framebuffer( c->gl_buffer );
+    gl_destroy_context( c->gl_ctx );
+
+    if (c->db_flag)
+#ifdef DDRAW
+        DDFree(c);
+#else
+    wmDeleteBackingStore(c);
+#endif
+    free( (void *) c );
+    //Following code is added to enable parallel render
+    // Parallel render only work in double buffer mode
+#if !defined(NO_PARALLEL)
+    if(parallelMachine)
+        PRDestroyRenderBuffer();
+#endif
+    // End modification
+}
+
+void WMesaMakeCurrent( WMesaContext c )
+{
+    if(!c){
+        Current = c;
+        return;
+    }
+
+    //
+    // A little optimization
+    // If it already is current,
+    // don't set it again
+    //
+    if(Current == c)
+        return;
+
+    //gl_set_context( c->gl_ctx );
+    gl_make_current(c->gl_ctx, c->gl_buffer);
+    setup_DD_pointers(c->gl_ctx);

+    Current = c;
+    if (Current->gl_ctx->Viewport.Width==0) {
+        /* initialize viewport to window size */
+        gl_Viewport( Current->gl_ctx,
+            0, 0, Current->width, Current->height );
+    }
+    if ((c->cColorBits <= 8 ) && (c->rgb_flag == GL_TRUE)){
+        WMesaPaletteChange(c->hPalHalfTone);
+    }
+}
+
+void  WMesaSwapBuffers( void )
+{
+    HDC DC = Current->hDC;
+    if (Current->db_flag)
+        wmFlush(Current);
+}
+
+void  WMesaPaletteChange(HPALETTE Pal)
+{
+    int vRet;
+    LPPALETTEENTRY pPal;
+    if (Current && (Current->rgb_flag==GL_FALSE || Current->dither_flag == GL_TRUE))
+    {
+        pPal = (PALETTEENTRY *)malloc( 256 * sizeof(PALETTEENTRY));
+        Current->hPal=Pal;
+        //  GetPaletteEntries( Pal, 0, 256, pPal );
+        GetPalette( Pal, pPal );
+#ifdef DDRAW
+        Current->lpDD->lpVtbl->CreatePalette(Current->lpDD,DDPCAPS_8BIT,
+            pPal, &(Current->lpDDPal), NULL);
+        if (Current->lpDDPal)
+            Current->lpDDSPrimary->lpVtbl->SetPalette(Current->lpDDSPrimary,Current->lpDDPal);
+#else
+        vRet = SetDIBColorTable(Current->dib.hDC,0,256,pPal);
+#endif
+        free( pPal );
+    }
+
+}
+
+static unsigned char threeto8[8] = {
+    0, 0111>>1, 0222>>1, 0333>>1, 0444>>1, 0555>>1, 0666>>1, 0377
+};
+
+static unsigned char twoto8[4] = {
+    0, 0x55, 0xaa, 0xff
+};
+
+static unsigned char oneto8[2] = {
+    0, 255
+};
+
+static unsigned char componentFromIndex(UCHAR i, UINT nbits, UINT shift)
+{
+    unsigned char val;
+
+    val = i >> shift;
+    switch (nbits) {
+
+    case 1:
+        val &= 0x1;
+        return oneto8[val];
+
+    case 2:
+        val &= 0x3;
+        return twoto8[val];
+
+    case 3:
+        val &= 0x7;
+        return threeto8[val];
+
+    default:
+        return 0;
+    }
+}
+
+void wmCreatePalette( PWMC pwdc )
+{
+    /* Create a compressed and re-expanded 3:3:2 palette */
+    int            i;
+    LOGPALETTE     *pPal;
+    BYTE           rb, rs, gb, gs, bb, bs;
+
+    pwdc->nColors = 0x100;
+
+    pPal = (PLOGPALETTE)malloc(sizeof(LOGPALETTE) + pwdc->nColors * sizeof(PALETTEENTRY));
+    memset( pPal, 0, sizeof(LOGPALETTE) + pwdc->nColors * sizeof(PALETTEENTRY) );
+
+    pPal->palVersion = 0x300;
+
+    rb = REDBITS;
+    rs = REDSHIFT;
+    gb = GREENBITS;
+    gs = GREENSHIFT;
+    bb = BLUEBITS;
+    bs = BLUESHIFT;
+
+    if (pwdc->db_flag) {
+
+        /* Need to make two palettes: one for the screen DC and one for the DIB. */
+        pPal->palNumEntries = pwdc->nColors;
+        for (i = 0; i < pwdc->nColors; i++) {
+            pPal->palPalEntry[i].peRed = componentFromIndex( i, rb, rs );
+            pPal->palPalEntry[i].peGreen = componentFromIndex( i, gb, gs );
+            pPal->palPalEntry[i].peBlue = componentFromIndex( i, bb, bs );
+            pPal->palPalEntry[i].peFlags = 0;
+        }
+        pwdc->hGLPalette = CreatePalette( pPal );
+        pwdc->hPalette = CreatePalette( pPal );
+    }
+
+    else {
+        pPal->palNumEntries = pwdc->nColors;
+        for (i = 0; i < pwdc->nColors; i++) {
+            pPal->palPalEntry[i].peRed = componentFromIndex( i, rb, rs );
+            pPal->palPalEntry[i].peGreen = componentFromIndex( i, gb, gs );
+            pPal->palPalEntry[i].peBlue = componentFromIndex( i, bb, bs );
+            pPal->palPalEntry[i].peFlags = 0;
+        }
+        pwdc->hGLPalette = CreatePalette( pPal );
+    }
+
+    free(pPal);
+
+}
+
+void wmSetPixel(PWMC pwc, int iScanLine, int iPixel, BYTE r, BYTE g, BYTE b)
+{
+    if(Current->db_flag){
+        LPBYTE  lpb = pwc->pbPixels;
+        LPDWORD lpdw;
+        LPWORD  lpw;
+        UINT    nBypp = pwc->cColorBits / 8;
+        UINT    nOffset = iPixel % nBypp;
+
+        // Move the pixel buffer pointer to the scanline that we
+        // want to access
+
+        //      pwc->dib.fFlushed = FALSE;
+
+        lpb += pwc->ScanWidth * iScanLine;
+        // Now move to the desired pixel
+        lpb += iPixel * nBypp;
+        lpb = PIXELADDR(iPixel, iScanLine);
+        lpdw = (LPDWORD)lpb;
+        lpw = (LPWORD)lpb;
+
+        if(nBypp == 1){
+            if(pwc->dither_flag)
+                *lpb = DITHER_RGB_2_8BIT(r,g,b,iScanLine,iPixel);
+            else
+                *lpb = BGR8(r,g,b);
+        }
+        else if(nBypp == 2)
+            *lpw = BGR16(r,g,b);
+        else if (nBypp == 3){
+            *lpdw = BGR24(r,g,b);
+        }
+        else if (nBypp == 4)
+            *lpdw = BGR32(r,g,b);
+    }
+    else{
+        HDC DC = DD_GETDC;
+        SetPixel(DC, iPixel, iScanLine, RGB(r,g,b));
+        DD_RELEASEDC;
+    }
+}
+
+void wmCreateDIBSection( HDC   hDC,
+						 PWMC pwc,    // handle of device context
+						 CONST BITMAPINFO *pbmi,  // address of structure containing bitmap size, format, and color data
+						 UINT iUsage  // color data type indicator: RGB values or palette indices
+                       )
+{
+    DWORD   dwSize = 0;
+    DWORD   dwScanWidth;
+    UINT    nBypp = pwc->cColorBits / 8;
+    HDC     hic;
+
+    dwScanWidth = (((pwc->ScanWidth * nBypp)+ 3) & ~3);
+
+    pwc->ScanWidth =pwc->pitch = dwScanWidth;
+
+    if (stereo_flag)
+        pwc->ScanWidth = 2* pwc->pitch;
+
+    dwSize = sizeof(BITMAPINFO) + (dwScanWidth * pwc->height);
+
+    pwc->dib.hFileMap = CreateFileMapping((HANDLE)PAGE_FILE,
+        NULL,
+        PAGE_READWRITE | SEC_COMMIT,
+        0,
+        dwSize,
+        NULL);
+
+    if (!pwc->dib.hFileMap)
+        return;
+
+    pwc->dib.base = MapViewOfFile(pwc->dib.hFileMap,
+        FILE_MAP_ALL_ACCESS,
+        0,
+        0,
+        0);
+
+    if(!pwc->dib.base){
+        CloseHandle(pwc->dib.hFileMap);
+        return;
+    }
+
+    //  pwc->pbPixels = pwc->addrOffScreen = ((LPBYTE)pwc->dib.base) + sizeof(BITMAPINFO);
+
+    //  pwc->dib.hDC = CreateCompatibleDC(hDC);
+
+    CopyMemory(pwc->dib.base, pbmi, sizeof(BITMAPINFO));
+
+    hic = CreateIC("display", NULL, NULL, NULL);
+    pwc->dib.hDC = CreateCompatibleDC(hic);
+
+
+    /*  pwc->hbmDIB = CreateDIBitmap(hic,
+    &(pwc->bmi.bmiHeader),
+    CBM_INIT,
+    pwc->pbPixels,
+    &(pwc->bmi),
+    DIB_RGB_COLORS);
+    */
+    pwc->hbmDIB = CreateDIBSection(hic,
+        &(pwc->bmi),
+        (iUsage ? DIB_PAL_COLORS : DIB_RGB_COLORS),
+        &(pwc->pbPixels),
+        pwc->dib.hFileMap,
+        0);
+        /*
+        pwc->hbmDIB = CreateDIBSection(hic,
+        &(pwc->bmi),
+        DIB_RGB_COLORS,
+        &(pwc->pbPixels),
+        pwc->dib.hFileMap,
+        0);
+    */
+    pwc->ScreenMem = pwc->addrOffScreen = pwc->pbPixels;
+    pwc->hOldBitmap = SelectObject(pwc->dib.hDC, pwc->hbmDIB);
+
+    DeleteDC(hic);
+
+    return;
+
+}
+
+//
+// Blit memory DC to screen DC
+//
+BOOL wmFlush(PWMC pwc)
+{
+    BOOL    bRet = 0;
+    DWORD   dwErr = 0;
+#ifdef DDRAW
+    HRESULT             ddrval;
+#endif
+
+    // Now search through the torus frames and mark used colors
+    if(pwc->db_flag){
+#ifdef DDRAW
+        if (pwc->lpDDSOffScreen == NULL)
+            if(DDCreateOffScreen(pwc) == GL_FALSE)
+                return;
+
+            pwc->lpDDSOffScreen->lpVtbl->Unlock(pwc->lpDDSOffScreen, NULL);
+
+            while( 1 )
+            {
+                ddrval = pwc->lpDDSPrimary->lpVtbl->Blt( pwc->lpDDSPrimary,
+                    &(pwc->rectSurface), pwc->lpDDSOffScreen, &(pwc->rectOffScreen), 0, NULL );
+
+                if( ddrval == DD_OK )
+                {
+                    break;
+                }
+                if( ddrval == DDERR_SURFACELOST )
+                {
+                    if(!DDRestoreAll(pwc))
+                    {
+                        break;
+                    }
+                }
+                if( ddrval != DDERR_WASSTILLDRAWING )
+                {
+                    break;
+                }
+            }
+
+            while (pwc->lpDDSOffScreen->lpVtbl->Lock(pwc->lpDDSOffScreen,
+                NULL, &(pwc->ddsd), 0, NULL) == DDERR_WASSTILLDRAWING)
+                ;
+
+            if(ddrval != DD_OK)
+                dwErr = GetLastError();
+#else
+            bRet = BitBlt(pwc->hDC, 0, 0, pwc->width, pwc->height,
+                pwc->dib.hDC, 0, 0, SRCCOPY);
+#endif
+    }
+
+    return(TRUE);
+
+}
+
+// The following code is added by Li Wei to enable stereo display
+
+#if !defined(NO_STEREO)
+
+void WMesaShowStereo(GLuint list)
+{
+
+    GLbitfield mask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT;
+    GLfloat cm[16];
+    GLint matrix_mode;
+    // Must use double Buffer
+    if( ! Current-> db_flag )
+        return;
+
+
+    glGetIntegerv(GL_MATRIX_MODE,&matrix_mode);
+
+    //  glPushMatrix();  //****
+    WMesaViewport(Current->gl_ctx,0,Current->height/2,Current->width,Current->height/2);
+    //  Current->gl_ctx->NewState = 0;
+
+    //  glViewport(0,0,Current->width,Current->height/2);
+    if(matrix_mode!=GL_MODELVIEW)
+        glMatrixMode(GL_MODELVIEW);
+
+    glGetFloatv(GL_MODELVIEW_MATRIX,cm);
+    glLoadIdentity();
+    gluLookAt(viewDistance/2,0.0,0.0 ,
+        viewDistance/2,0.0,-1.0,
+        0.0,1.0,0.0 );
+    //  glTranslatef(viewDistance/2.0,0.,0.);
+    glMultMatrixf( cm );
+
+    Current->ScreenMem = Current->pbPixels = Current->addrOffScreen;
+    //glPushMatrix();
+    glCallList( list );
+    //glPopMatrix();
+
+    glGetFloatv(GL_MODELVIEW_MATRIX,cm);
+    glLoadIdentity();
+    gluLookAt(-viewDistance/2,0.0,0.0 ,
+        -viewDistance/2,0.0,-1.0,
+        0.0,1.0,0.0 );
+    //  glTranslatef(-viewDistance/2.0,0.,0.);
+    glMultMatrixf(cm);
+
+    Current->ScreenMem = Current->pbPixels = Current->addrOffScreen + Current->pitch;
+    glCallList(list);
+    if(matrix_mode!=GL_MODELVIEW)
+        glMatrixMode(matrix_mode);
+
+    //  glPopMatrix();
+    glFlush();
+
+    WMesaViewport(Current->gl_ctx,0,0,Current->width,Current->height);
+    //  Current->gl_ctx->NewState = 0;
+    WMesaSwapBuffers();
+
+}
+
+void toggleStereoMode()
+{
+    if(!Current->db_flag)
+        return;
+    if(!stereo_flag){
+        stereo_flag = 1;
+        if(stereoBuffer==GL_FALSE)
+#if !defined(NO_PARALLEL)
+            if(!parallelFlag)
+#endif
+            {
+                Current->ScanWidth = Current->pitch*2;
+            }
+    }
+    else {
+        stereo_flag = 0;
+#if !defined(NO_PARALLEL)
+        if(!parallelFlag)
+#endif
+            Current->ScanWidth = Current->pitch;
+        Current->pbPixels = Current->addrOffScreen;
+    }
+}
+
+/* if in stereo mode, the following function is called */
+void glShowStereo(GLuint list)
+{
+    WMesaShowStereo(list);
+}
+
+#endif // End if NO_STEREO not defined
+
+#if !defined(NO_PARALLEL)
+
+void toggleParallelMode(void)
+{
+    if(!parallelFlag){
+        parallelFlag = GL_TRUE;
+        if(parallelMachine==GL_FALSE){
+            PRCreateRenderBuffer( Current->rgb_flag? GL_RGBA :GL_COLOR_INDEX,
+                Current->cColorBits/8,
+                Current->width ,Current->height,
+                Current->ScanWidth,
+                Current->rgb_flag? Current->pbPixels: Current->ScreenMem);
+            parallelMachine = GL_TRUE;
+        }
+    }
+    else {
+        parallelFlag = GL_FALSE;
+        if(parallelMachine==GL_TRUE){
+            PRDestroyRenderBuffer();
+            parallelMachine=GL_FALSE;
+            ReadyForNextFrame = GL_TRUE;
+        }
+
+        /***********************************************
+        // Seems something wrong!!!!
+        ************************************************/
+
+        WMesaMakeCurrent(Current);
+#if !defined(NO_STEREO)
+        stereo_flag = GL_FALSE ;
+#endif
+    }
+}
+
+void PRShowRenderResult(void)
+{
+    int flag = 0;
+    if(!glImageRendered())
+        return;
+
+    if (parallelFlag)
+    {
+        WMesaSwapBuffers();
+    }
+
+}
+#endif //End if NO_PARALLEL not defined
+
+//end modification
+
+BYTE DITHER_RGB_2_8BIT( int red, int green, int blue, int pixel, int scanline)
+{
+    char unsigned redtemp, greentemp, bluetemp, paletteindex;
+
+    //*** now, look up each value in the halftone matrix
+    //*** using an 8x8 ordered dither.
+    redtemp = aDividedBy51[red]
+        + (aModulo51[red] > aHalftone8x8[(pixel%8)*8
+        + scanline%8]);
+    greentemp = aDividedBy51[(char unsigned)green]
+        + (aModulo51[green] > aHalftone8x8[
+        (pixel%8)*8 + scanline%8]);
+    bluetemp = aDividedBy51[(char unsigned)blue]
+        + (aModulo51[blue] > aHalftone8x8[
+        (pixel%8)*8 +scanline%8]);
+
+    //*** recombine the halftoned rgb values into a palette index
+    paletteindex =
+        redtemp + aTimes6[greentemp] + aTimes36[bluetemp];
+
+    //*** and translate through the wing halftone palette
+    //*** translation vector to give the correct value.
+    return aWinGHalftoneTranslation[paletteindex];
+}
+
+#ifdef DDRAW
+/*
+* restoreAll
+*
+* restore all lost objects
+*/
+static HRESULT DDRestoreAll( WMesaContext wc )
+{
+    HRESULT     ddrval;
+
+    ddrval = wc->lpDDSPrimary->lpVtbl->Restore(wc->lpDDSPrimary);
+    if( ddrval == DD_OK )
+    {
+        ddrval = wc->lpDDSOffScreen->lpVtbl->Restore(wc->lpDDSOffScreen);
+    }
+    return ddrval;
+
+} /* restoreAll */
+
+
+  /*
+  * This function is called if the initialization function fails
+*/
+static BOOL initFail( HWND hwnd, WMesaContext wc )
+{
+    DDFree(wc);
+    MessageBox( hwnd, "DirectDraw Init FAILED", "", MB_OK );
+    return FALSE;
+
+} /* initFail */
+
+
+static void DDDeleteOffScreen(WMesaContext wc)
+{
+    if( wc->lpDDSOffScreen != NULL )
+    {
+        wc->lpDDSOffScreen->lpVtbl->Unlock(wc->lpDDSOffScreen,NULL);
+        wc->lpDDSOffScreen->lpVtbl->Release(wc->lpDDSOffScreen);
+        wc->lpDDSOffScreen = NULL;
+    }
+
+}
+
+static void DDFreePrimarySurface(WMesaContext wc)
+{
+    if( wc->lpDDSPrimary != NULL )
+    {
+        if(wc->db_flag == GL_FALSE)
+            wc->lpDDSPrimary->lpVtbl->ReleaseDC(wc->lpDDSPrimary, wc->hDC);
+        wc->lpDDSPrimary->lpVtbl->Release(wc->lpDDSPrimary);
+        wc->lpDDSPrimary = NULL;
+    }
+}
+
+static BOOL DDCreatePrimarySurface(WMesaContext wc)
+{
+    HRESULT ddrval;
+    DDSCAPS             ddscaps;
+    wc->ddsd.dwSize = sizeof( wc->ddsd );
+    wc->ddsd.dwFlags = DDSD_CAPS;
+    wc->ddsd.ddsCaps.dwCaps =   DDSCAPS_PRIMARYSURFACE;
+
+    ddrval = wc->lpDD->lpVtbl->CreateSurface( wc->lpDD,&(wc->ddsd), &(wc->lpDDSPrimary), NULL );
+    if( ddrval != DD_OK )
+    {
+        return initFail(wc->hwnd , wc);
+    }
+    if(wc->db_flag == GL_FALSE)
+        wc->lpDDSPrimary->lpVtbl->GetDC(wc->lpDDSPrimary, wc->hDC);
+    return TRUE;
+}
+
+static BOOL DDCreateOffScreen(WMesaContext wc)
+{
+    POINT   pt;
+    HRESULT     ddrval;
+    if(wc->lpDD == NULL)
+        return FALSE;
+    GetClientRect( wc->hwnd, &(wc->rectOffScreen) );
+    wc->ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH;
+    wc->ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;
+    wc->ddsd.dwHeight = wc->rectOffScreen.bottom - wc->rectOffScreen.top;
+    wc->ddsd.dwWidth = wc->rectOffScreen.right - wc->rectOffScreen.left;
+
+    ddrval = wc->lpDD->lpVtbl->CreateSurface( wc->lpDD, &(wc->ddsd), &(wc->lpDDSOffScreen), NULL );
+    if( ddrval != DD_OK )
+    {
+        return FALSE;
+    }
+
+    while (wc->lpDDSOffScreen->lpVtbl->Lock(wc->lpDDSOffScreen,NULL, &(wc->ddsd), 0, NULL) == DDERR_WASSTILLDRAWING)
+        ;
+    //  while ((ddrval = wc->lpDDSOffScreen->lpVtbl->Lock(wc->lpDDSOffScreen,NULL, &(wc->ddsd), DDLOCK_SURFACEMEMORYPTR , NULL)) != DD_OK)
+    ;
+    if(wc->ddsd.lpSurface==NULL)
+        return initFail(wc->hwnd, wc);
+
+    wc->ScreenMem = wc->pbPixels = wc->addrOffScreen = (PBYTE)(wc->ddsd.lpSurface);
+    wc->ScanWidth = wc->pitch = wc->ddsd.lPitch;
+    if (stereo_flag)
+        wc->ScanWidth = wc->ddsd.lPitch*2;
+
+    GetClientRect( wc->hwnd, &(wc->rectSurface) );
+    pt.x = pt.y = 0;
+    ClientToScreen( wc->hwnd, &pt );
+    OffsetRect(&(wc->rectSurface), pt.x, pt.y);
+    wmSetPixelFormat(wc, wc->hDC);
+    return TRUE;
+}
+
+/*
+* doInit - do work required for every instance of the application:
+*                create the window, initialize data
+*/
+static BOOL DDInit( WMesaContext wc, HWND hwnd)
+{
+    HRESULT             ddrval;
+    DWORD dwFrequency;
+
+    LPDIRECTDRAW            lpDD;           // DirectDraw object
+    LPDIRECTDRAW2            lpDD2;
+
+
+    wc->fullScreen = displayOptions.fullScreen;
+    wc->gMode = displayOptions.mode;
+    wc->hwnd = hwnd;
+    stereo_flag = displayOptions.stereo;
+    if(wc->db_flag!= GL_TRUE)
+        stereo_flag = GL_FALSE;
+        /*
+        * create the main DirectDraw object
+    */
+    ddrval = DirectDrawCreate( NULL, &(wc->lpDD), NULL );
+    if( ddrval != DD_OK )
+    {
+        return initFail(hwnd,wc);
+    }
+
+    // Get exclusive mode if requested
+    if(wc->fullScreen)
+    {
+        ddrval = wc->lpDD->lpVtbl->SetCooperativeLevel( wc->lpDD, hwnd, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN );
+    }
+    else
+    {
+        ddrval = wc->lpDD->lpVtbl->SetCooperativeLevel( wc->lpDD, hwnd, DDSCL_NORMAL );
+    }
+    if( ddrval != DD_OK )
+    {
+        return initFail(hwnd , wc);
+    }
+
+
+    /*  ddrval = wc->lpDD->lpVtbl->QueryInterface(wc->lpDD, IID_IDirectDraw2,
+    (LPVOID *)((wc->lpDD2)));
+
+    */
+    if(ddrval != DD_OK)
+        return initFail(hwnd , wc);
+
+
+    //ddrval = wc->lpDD->lpVtbl->GetDisplayMode( wc->lpDD, &(wc->ddsd));
+    //  wc->lpDD2->lpVtbl->GetMonitorFrequency(wc->lpDD, &dwFrequency);
+    switch( wc->gMode )
+    {
+    case 1:  ddrval = wc->lpDD->lpVtbl->SetDisplayMode( wc->lpDD, 640, 480, displayOptions.bpp); break;
+    case 2:  ddrval = wc->lpDD->lpVtbl->SetDisplayMode( wc->lpDD, 800, 600, displayOptions.bpp); break;
+    case 3:  ddrval = wc->lpDD->lpVtbl->SetDisplayMode( wc->lpDD, 1024, 768, displayOptions.bpp); break;
+    case 4:  ddrval = wc->lpDD->lpVtbl->SetDisplayMode( wc->lpDD, 1152, 864, displayOptions.bpp); break;
+    case 5:  ddrval = wc->lpDD->lpVtbl->SetDisplayMode( wc->lpDD, 1280, 1024, displayOptions.bpp); break;
+    }
+
+    if( ddrval != DD_OK )
+    {
+        printf("Can't modify display mode, current mode used\n");
+        //        return initFail(hwnd , wc);
+    }
+    //ddrval = wc->lpDD->lpVtbl->GetDisplayMode( wc->lpDD, &(wc->ddsd));
+    switch(ddrval){
+    case DDERR_INVALIDOBJECT:
+        break;
+    case DDERR_INVALIDPARAMS:
+        break;
+    case DDERR_UNSUPPORTEDMODE:
+        ;
+    }
+
+    if(DDCreatePrimarySurface(wc) == GL_FALSE)
+        return initFail(hwnd, wc);
+
+    if(wc->db_flag)
+        return DDCreateOffScreen(wc);
+} /* DDInit */
+
+static void DDFree( WMesaContext wc)
+{
+    if( wc->lpDD != NULL )
+    {
+        DDFreePrimarySurface(wc);
+        DDDeleteOffScreen(wc);
+        wc->lpDD->lpVtbl->Release(wc->lpDD);
+        wc->lpDD = NULL;
+    }
+    // Clean up the screen on exit
+    RedrawWindow( NULL, NULL, NULL, RDW_INVALIDATE | RDW_ERASE |
+        RDW_ALLCHILDREN );
+
+}
+#endif
+
+void WMesaMove(void)
+{
+    WMesaContext wc = Current;
+    POINT   pt;
+    if (Current != NULL){
+        GetClientRect( wc->hwnd, &(wc->rectSurface) );
+        pt.x = pt.y = 0;
+        ClientToScreen( wc->hwnd, &pt );
+        OffsetRect(&(wc->rectSurface), pt.x, pt.y);
+    }
+}
+
+
+
+/*
+* Like PACK_8A8B8G8R() but don't use alpha.  This is usually an acceptable
+* shortcut.
+*/
+#define PACK_8B8G8R( R, G, B )   ( ((B) << 16) | ((G) << 8) | (R) )
+
+
+/**********************************************************************/
+/***                   Triangle rendering                            ***/
+/**********************************************************************/
+
+/*
+ * XImage, smooth, depth-buffered, PF_8A8B8G8R triangle.
+ */
+static void smooth_8A8B8G8R_z_triangle( GLcontext *ctx,
+                                       GLuint v0, GLuint v1, GLuint v2,
+                                       GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint i, len = RIGHT-LEFT;                      \
+    for (i=0;i<len;i++) {                       \
+    GLdepth z = FixedToDepth(ffz);                  \
+    if (z < zRow[i]) {                      \
+    pRow[i] = PACK_8B8G8R( FixedToInt(ffr), FixedToInt(ffg),    \
+    FixedToInt(ffb) );          \
+    zRow[i] = z;                            \
+    }                                   \
+    ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    ffz += fdzdx;                           \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, smooth, depth-buffered, PF_8R8G8B triangle.
+*/
+static void smooth_8R8G8B_z_triangle( GLcontext *ctx,
+                                     GLuint v0, GLuint v1, GLuint v2,
+                                     GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint i, len = RIGHT-LEFT;                      \
+    for (i=0;i<len;i++) {                       \
+    GLdepth z = FixedToDepth(ffz);                  \
+    if (z < zRow[i]) {                      \
+    pRow[i] = PACK_8R8G8B( FixedToInt(ffr), FixedToInt(ffg),    \
+    FixedToInt(ffb) );          \
+    zRow[i] = z;                            \
+    }                                   \
+    ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    ffz += fdzdx;                           \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+
+/*
+* XImage, smooth, depth-buffered, PF_5R6G5B triangle.
+*/
+static void smooth_5R6G5B_z_triangle( GLcontext *ctx,
+                                     GLuint v0, GLuint v1, GLuint v2,
+                                     GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR2(X,Y)
+#define PIXEL_TYPE GLushort
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint i, len = RIGHT-LEFT;                      \
+    for (i=0;i<len;i++) {                       \
+    GLdepth z = FixedToDepth(ffz);                  \
+    if (z < zRow[i]) {                      \
+    pRow[i] = PACK_5R6G5B( FixedToInt(ffr), FixedToInt(ffg),    \
+    FixedToInt(ffb) );          \
+    zRow[i] = z;                            \
+    }                                   \
+    ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    ffz += fdzdx;                           \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+/*
+* XImage, flat, depth-buffered, PF_8A8B8G8R triangle.
+*/
+static void flat_8A8B8G8R_z_triangle( GLcontext *ctx, GLuint v0,
+                                     GLuint v1, GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_8B8G8R( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint i, len = RIGHT-LEFT;                      \
+    for (i=0;i<len;i++) {                       \
+    GLdepth z = FixedToDepth(ffz);                  \
+    if (z < zRow[i]) {                      \
+    pRow[i] = p;                            \
+    zRow[i] = z;                            \
+    }                                   \
+    ffz += fdzdx;                           \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, depth-buffered, PF_8R8G8B triangle.
+*/
+static void flat_8R8G8B_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                   GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_8R8G8B( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint i, len = RIGHT-LEFT;              \
+    for (i=0;i<len;i++) {               \
+    GLdepth z = FixedToDepth(ffz);          \
+    if (z < zRow[i]) {              \
+    pRow[i] = p;                    \
+    zRow[i] = z;                    \
+    }                           \
+    ffz += fdzdx;                   \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, depth-buffered, PF_5R6G5B triangle.
+*/
+static void flat_5R6G5B_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                   GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR2(X,Y)
+#define PIXEL_TYPE GLushort
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_5R6G5B( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint i, len = RIGHT-LEFT;              \
+    for (i=0;i<len;i++) {               \
+    GLdepth z = FixedToDepth(ffz);          \
+    if (z < zRow[i]) {              \
+    pRow[i] = p;                    \
+    zRow[i] = z;                    \
+    }                           \
+    ffz += fdzdx;                   \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, smooth, NON-depth-buffered, PF_8A8B8G8R triangle.
+*/
+static void smooth_8A8B8G8R_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                     GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint xx;                               \
+    PIXEL_TYPE *pixel = pRow;                       \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {               \
+    *pixel = PACK_8B8G8R( FixedToInt(ffr), FixedToInt(ffg),     \
+                FixedToInt(ffb) );          \
+                ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, smooth, NON-depth-buffered, PF_8R8G8B triangle.
+*/
+static void smooth_8R8G8B_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                   GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint xx;                               \
+    PIXEL_TYPE *pixel = pRow;                       \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {               \
+    *pixel = PACK_8R8G8B( FixedToInt(ffr), FixedToInt(ffg),     \
+                FixedToInt(ffb) );          \
+                ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, smooth, NON-depth-buffered, PF_5R6G5B triangle.
+*/
+static void smooth_5R6G5B_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                   GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR2(X,Y)
+#define PIXEL_TYPE GLushort
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint xx;                               \
+    PIXEL_TYPE *pixel = pRow;                       \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {               \
+    *pixel = PACK_5R6G5B( FixedToInt(ffr), FixedToInt(ffg),     \
+                FixedToInt(ffb) );          \
+                ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;         \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+
+/*
+* XImage, flat, NON-depth-buffered, PF_8A8B8G8R triangle.
+*/
+static void flat_8A8B8G8R_triangle( GLcontext *ctx, GLuint v0,
+                                   GLuint v1, GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_8B8G8R( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint xx;                       \
+    PIXEL_TYPE *pixel = pRow;               \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {       \
+    *pixel = p;                 \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, NON-depth-buffered, PF_8R8G8B triangle.
+*/
+static void flat_8R8G8B_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                 GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define PIXEL_ADDRESS(X,Y) PIXELADDR4(X,Y)
+#define PIXEL_TYPE GLuint
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_8R8G8B( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint xx;                       \
+    PIXEL_TYPE *pixel = pRow;               \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {       \
+    *pixel = p;                 \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, NON-depth-buffered, PF_5R6G5B triangle.
+*/
+static void flat_5R6G5B_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                 GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define PIXEL_ADDRESS(X,Y) PIXELADDR2(X,Y)
+#define PIXEL_TYPE GLushort
+    //#define BYTES_PER_ROW (wmesa->xm_buffer->backimage->bytes_per_line)
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                  \
+    unsigned long p = PACK_5R6G5B( VB->Color[pv][0],    \
+    VB->Color[pv][1], VB->Color[pv][2] );
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint xx;                       \
+    PIXEL_TYPE *pixel = pRow;               \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {       \
+    *pixel = p;                 \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, smooth, depth-buffered, 8-bit PF_LOOKUP triangle.
+*/
+
+static void smooth_ci_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                 GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define INTERP_INDEX 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                                \
+    {                                                                   \
+    GLint i, len = RIGHT-LEFT;                                      \
+    for (i=0;i<len;i++) {                                           \
+    GLdepth z = FixedToDepth(ffz);                              \
+    if (z < zRow[i]) {                                          \
+    pRow[i] = FixedToInt(ffi);                                  \
+    zRow[i] = z;                                                \
+    }                                                               \
+    ffi += fdidx;                                                   \
+    ffz += fdzdx;                                                   \
+    }                                                               \
+    }
+
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, depth-buffered, 8-bit PF_LOOKUP triangle.
+*/
+
+static void flat_ci_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                               GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                                                  \
+    GLuint index = VB->Index[pv];                                   \
+    if (!VB->MonoColor) {                                           \
+    /* set the color index */                                       \
+    (*ctx->Driver.Index)( ctx, index );                         \
+    }
+#define INNER_LOOP( LEFT, RIGHT, Y )                                \
+    {                                                                   \
+    GLint i, len = RIGHT-LEFT;                                      \
+    for (i=0;i<len;i++) {                                           \
+    GLdepth z = FixedToDepth(ffz);                              \
+    if (z < zRow[i]) {                                          \
+    pRow[i] = index;                                            \
+    zRow[i] = z;                                                \
+    }                                                               \
+    ffz += fdzdx;                                                   \
+    }                                                               \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+
+/*
+* XImage, smooth, NON-depth-buffered, 8-bit PF_LOOKUP triangle.
+*/
+
+static void smooth_ci_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                               GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define INTERP_INDEX 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                    \
+    {                                   \
+    GLint xx;                               \
+    PIXEL_TYPE *pixel = pRow;                       \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {               \
+    *pixel = FixedToInt(ffi);           \
+    ffi += fdidx;           \
+    }                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+/*
+* XImage, flat, NON-depth-buffered, 8-bit PF_LOOKUP triangle.
+*/
+static void flat_ci_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                             GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define SETUP_CODE                                                  \
+    GLuint index = VB->Index[pv];                                   \
+    if (!VB->MonoColor) {                                           \
+    /* set the color index */                                       \
+    (*ctx->Driver.Index)( ctx, index );                         \
+    }
+#define INNER_LOOP( LEFT, RIGHT, Y )            \
+    {                           \
+    GLint xx;                       \
+    PIXEL_TYPE *pixel = pRow;               \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {       \
+    *pixel = index;                 \
+    }                           \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+/*
+* XImage, smooth, depth-buffered, 8-bit, PF_DITHER8 triangle.
+*/
+static void smooth_DITHER8_z_triangle( GLcontext *ctx,
+                                      GLuint v0, GLuint v1, GLuint v2,
+                                      GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+    DITHER_RGB_TO_8BIT_SETUP
+#define INTERP_Z 1
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                                    \
+    {                                                                       \
+    GLint i, xx = LEFT, yy = FLIP(Y), len = RIGHT-LEFT;                 \
+    for (i=0;i<len;i++,xx++) {                                          \
+    GLdepth z = FixedToDepth(ffz);                                  \
+    if (z < zRow[i]) {                                              \
+    DITHER_RGB_TO_8BIT( FixedToInt(ffr), FixedToInt(ffg),           \
+    FixedToInt(ffb), xx, yy);               \
+    pRow[i] = pixelDithered;                                        \
+    zRow[i] = z;                                                    \
+    }                                                                   \
+    ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;                     \
+    ffz += fdzdx;                                                       \
+    }                                                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+/*
+* XImage, flat, depth-buffered, 8-bit PF_DITHER triangle.
+*/
+static void flat_DITHER8_z_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                    GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+    DITHER_RGB_TO_8BIT_SETUP
+#define INTERP_Z 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+
+#define INNER_LOOP( LEFT, RIGHT, Y )                                    \
+    {                                                                       \
+    GLint i, xx = LEFT, yy = FLIP(Y), len = RIGHT-LEFT;                 \
+    for (i=0;i<len;i++,xx++) {                                          \
+    GLdepth z = FixedToDepth(ffz);                                  \
+    if (z < zRow[i]) {                                              \
+    DITHER_RGB_TO_8BIT( VB->Color[pv][0],                           \
+             VB->Color[pv][1], VB->Color[pv][2], xx, yy);               \
+             pRow[i] = pixelDithered;                                       \
+             zRow[i] = z;                                                   \
+    }                                                                   \
+    ffz += fdzdx;                                                       \
+    }                                                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+/*
+* XImage, smooth, NON-depth-buffered, 8-bit PF_DITHER triangle.
+*/
+static void smooth_DITHER8_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                    GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+    DITHER_RGB_TO_8BIT_SETUP
+#define INTERP_RGB 1
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+#define INNER_LOOP( LEFT, RIGHT, Y )                                    \
+    {                                                                       \
+    GLint xx, yy = FLIP(Y);                                             \
+    PIXEL_TYPE *pixel = pRow;                                           \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {                               \
+    DITHER_RGB_TO_8BIT( VB->Color[pv][0],   VB->Color[pv][1], VB->Color[pv][2], xx, yy);\
+    *pixel = pixelDithered;                                         \
+    ffr += fdrdx;  ffg += fdgdx;  ffb += fdbdx;                     \
+    }                                                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+/*
+* XImage, flat, NON-depth-buffered, 8-bit PF_DITHER triangle.
+*/
+
+static void flat_DITHER8_triangle( GLcontext *ctx, GLuint v0, GLuint v1,
+                                  GLuint v2, GLuint pv )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+    DITHER_RGB_TO_8BIT_SETUP
+#define PIXEL_ADDRESS(X,Y) PIXELADDR1(X,Y)
+#define PIXEL_TYPE GLubyte
+#define BYTES_PER_ROW (wmesa->ScanWidth)
+
+#define INNER_LOOP( LEFT, RIGHT, Y )                                    \
+    {                                                                       \
+    GLint xx, yy = FLIP(Y);                                             \
+    PIXEL_TYPE *pixel = pRow;                                           \
+    for (xx=LEFT;xx<RIGHT;xx++,pixel++) {                               \
+    DITHER_RGB_TO_8BIT( VB->Color[pv][0],                               \
+             VB->Color[pv][1], VB->Color[pv][2], xx, yy);               \
+             *pixel = pixelDithered;                                            \
+    }                                                                   \
+    }
+#ifdef WIN32
+	#include "..\tritemp.h"
+#else
+	#include "tritemp.h"
+#endif
+}
+
+
+
+
+static triangle_func choose_triangle_function( GLcontext *ctx )
+{
+    WMesaContext wmesa = (WMesaContext) ctx->DriverCtx;
+    int depth = wmesa->cColorBits;
+
+    if (ctx->Polygon.SmoothFlag)     return NULL;
+    if (ctx->Texture.Enabled)        return NULL;
+    if (!wmesa->db_flag) return NULL;
+    /*if (wmesa->xm_buffer->buffer==XIMAGE)*/ {
+    if (   ctx->Light.ShadeModel==GL_SMOOTH
+        && ctx->RasterMask==DEPTH_BIT
+        && ctx->Depth.Func==GL_LESS
+        && ctx->Depth.Mask==GL_TRUE
+        && ctx->Polygon.StippleFlag==GL_FALSE) {
+        switch (wmesa->pixelformat) {
+        case PF_8A8B8G8R:
+            return smooth_8A8B8G8R_z_triangle;
+        case PF_8R8G8B:
+            return smooth_8R8G8B_z_triangle;
+        case PF_5R6G5B:
+            return smooth_5R6G5B_z_triangle;
+        case PF_DITHER8:
+            return  smooth_DITHER8_z_triangle;
+        case PF_INDEX8:
+            return smooth_ci_z_triangle;
+        default:
+            return NULL;
+        }
+    }
+    if (   ctx->Light.ShadeModel==GL_FLAT
+        && ctx->RasterMask==DEPTH_BIT
+        && ctx->Depth.Func==GL_LESS
+        && ctx->Depth.Mask==GL_TRUE
+        && ctx->Polygon.StippleFlag==GL_FALSE) {
+        switch (wmesa->pixelformat) {
+        case PF_8A8B8G8R:
+            return flat_8A8B8G8R_z_triangle;
+        case PF_8R8G8B:
+            return flat_8R8G8B_z_triangle;
+        case PF_5R6G5B:
+            return flat_5R6G5B_z_triangle;
+        case PF_DITHER8:
+            return flat_DITHER8_z_triangle;
+        case PF_INDEX8:
+            return flat_ci_z_triangle;
+        default:
+            return NULL;
+        }
+    }
+    if (   ctx->RasterMask==0   /* no depth test */
+        && ctx->Light.ShadeModel==GL_SMOOTH
+        && ctx->Polygon.StippleFlag==GL_FALSE) {
+        switch (wmesa->pixelformat) {
+        case PF_8A8B8G8R:
+            return smooth_8A8B8G8R_triangle;
+        case PF_8R8G8B:
+            return smooth_8R8G8B_triangle;
+        case PF_5R6G5B:
+            return smooth_5R6G5B_triangle;
+        case PF_DITHER8:
+            return smooth_DITHER8_triangle;
+        case PF_INDEX8:
+            return smooth_ci_triangle;
+        default:
+            return NULL;
+        }
+    }
+
+    if (   ctx->RasterMask==0   /* no depth test */
+        && ctx->Light.ShadeModel==GL_FLAT
+        && ctx->Polygon.StippleFlag==GL_FALSE) {
+        switch (wmesa->pixelformat) {
+        case PF_8A8B8G8R:
+            return flat_8A8B8G8R_triangle;
+        case PF_8R8G8B:
+            return flat_8R8G8B_triangle;
+        case PF_5R6G5B:
+            return flat_5R6G5B_triangle;
+        case PF_DITHER8:
+            return flat_DITHER8_triangle;
+        case PF_INDEX8:
+            return flat_ci_triangle;
+        default:
+            return NULL;
+        }
+    }
+
+    return NULL;
+    }
+}
+
+/*
+* Define a new viewport and reallocate auxillary buffers if the size of
+* the window (color buffer) has changed.
+*/
+void WMesaViewport( GLcontext *ctx,
+                   GLint x, GLint y, GLsizei width, GLsizei height )
+{
+    /* Save viewport */
+    ctx->Viewport.X = x;
+    ctx->Viewport.Width = width;
+    ctx->Viewport.Y = y;
+    ctx->Viewport.Height = height;
+
+    /* compute scale and bias values */
+    ctx->Viewport.Sx = (GLfloat) width / 2.0F;
+    ctx->Viewport.Tx = ctx->Viewport.Sx + x;
+    ctx->Viewport.Sy = (GLfloat) height / 2.0F;
+    ctx->Viewport.Ty = ctx->Viewport.Sy + y;
+}