path: root/src/mesa/drivers/glide/fxapi.c

/* -*- mode: C; tab-width:8;  -*- */

/*
 * Mesa 3-D graphics library
 * Version:  3.3
 *
 * Copyright (C) 1999-2000  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 *
 * Original Mesa / 3Dfx device driver (C) 1999 David Bucciarelli, by the
 * terms stated above.
 *
 * Thank you for your contribution, David!
 *
 * Please make note of the above copyright/license statement.  If you
 * contributed code or bug fixes to this code under the previous (GNU
 * Library) license and object to the new license, your code will be
 * removed at your request.  Please see the Mesa docs/COPYRIGHT file
 * for more information.
 *
 * Additional Mesa/3Dfx driver developers:
 *   Daryll Strauss <daryll@precisioninsight.com>
 *   Keith Whitwell <keith@precisioninsight.com>
 *
 * See fxapi.h for more revision/author details.
 */


#ifdef HAVE_CONFIG_H
#include "conf.h"
#endif

#if defined(FX)
#include "fxdrv.h"

static fxMesaContext fxMesaCurrentCtx=NULL;

/*
 * Status of 3Dfx hardware initialization
 */

static int glbGlideInitialized=0;
static int glb3DfxPresent=0;
static int glbTotNumCtx=0;

GrHwConfiguration glbHWConfig;
int glbCurrentBoard=0;


#if defined(__WIN32__)
static int cleangraphics(void)
{
  glbTotNumCtx=1;
  fxMesaDestroyContext(fxMesaCurrentCtx);

  return 0;
}
#elif defined(__linux__)
static void cleangraphics(void)
{
  glbTotNumCtx=1;
  fxMesaDestroyContext(fxMesaCurrentCtx);
}

static void cleangraphics_handler(int s)
{
  fprintf(stderr,"fxmesa: Received a not handled signal %d\n",s);

  cleangraphics();
/*    abort(); */
  exit(1);
}
#endif


/*
 * Select the Voodoo board to use when creating
 * a new context.
 */
GLboolean GLAPIENTRY fxMesaSelectCurrentBoard(int n)
{
  fxQueryHardware();

  if((n<0) || (n>=glbHWConfig.num_sst))
    return GL_FALSE;

  glbCurrentBoard=n;

  return GL_TRUE;
}


fxMesaContext GLAPIENTRY fxMesaGetCurrentContext(void)
{
  return fxMesaCurrentCtx;
}


/*
 * The 3Dfx Global Palette extension for GLQuake.
 * More a trick than a real extesion, use the shared global
 * palette extension. 
 */
extern void GLAPIENTRY gl3DfxSetPaletteEXT(GLuint *pal); /* silence warning */
void GLAPIENTRY gl3DfxSetPaletteEXT(GLuint *pal)
{
  fxMesaContext fxMesa =fxMesaCurrentCtx;
  
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    int i;

    fprintf(stderr,"fxmesa: gl3DfxSetPaletteEXT()\n");

    for(i=0;i<256;i++)
      fprintf(stderr,"%x\n",pal[i]);
  }
  
  if(fxMesa) {
    fxMesa->haveGlobalPaletteTexture=1;
    
    FX_grTexDownloadTable(GR_TMU0,GR_TEXTABLE_PALETTE,(GuTexPalette *)pal);
    if (fxMesa->haveTwoTMUs)
    	 FX_grTexDownloadTable(GR_TMU1,GR_TEXTABLE_PALETTE,(GuTexPalette *)pal);
  }
}


static GrScreenResolution_t fxBestResolution(int width, int height, int aux)
{
  static int resolutions[][5]={ 
    { 320, 200, GR_RESOLUTION_320x200, 2, 2 },
    { 320, 240, GR_RESOLUTION_320x240, 2, 2 },
    { 512, 384, GR_RESOLUTION_512x384, 2, 2 },
    { 640, 400, GR_RESOLUTION_640x400, 2, 2 },
    { 640, 480, GR_RESOLUTION_640x480, 2, 2 },
    { 800, 600, GR_RESOLUTION_800x600, 4, 2 },
    { 960, 720, GR_RESOLUTION_960x720, 6, 4 }
#ifdef GR_RESOLUTION_1024x768
    ,{ 1024, 768, GR_RESOLUTION_1024x768, 8, 4 }
#endif
#ifdef GR_RESOLUTION_1280x1024
    ,{ 1280, 1024, GR_RESOLUTION_1280x1024, 8, 8 }
#endif
#ifdef GR_RESOLUTION_1600x1200
    ,{ 1600, 1200, GR_RESOLUTION_1600x1200, 16, 8 }
#endif
  };
  int NUM_RESOLUTIONS = sizeof(resolutions) / (sizeof(int)*5);
  int i,fbmem;
  GrScreenResolution_t lastvalidres=resolutions[4][2];

  fxQueryHardware();

  if(glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_VOODOO) {
    fbmem=glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig.fbRam;

    if(glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig.sliDetect)
      fbmem*=2;
  } else if(glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_SST96)
    fbmem=glbHWConfig.SSTs[glbCurrentBoard].sstBoard.SST96Config.fbRam;
  else
    fbmem=2;

  /* A work around for BZFlag */

  if((width==1) && (height==1)) {
    width=640;
    height=480;
  }

  for(i=0;i<NUM_RESOLUTIONS;i++)
    if(resolutions[i][4-aux]<=fbmem) {
      if((width<=resolutions[i][0]) && (height<=resolutions[i][1]))
        return resolutions[i][2];

      lastvalidres=resolutions[i][2];
    }

  return lastvalidres;
}


fxMesaContext GLAPIENTRY fxMesaCreateBestContext(GLuint win,GLint width, GLint height,
					       const GLint attribList[])
{
  GrScreenRefresh_t refresh;
  int i;
  int res,aux;
  refresh=GR_REFRESH_75Hz;

  if(getenv("SST_SCREENREFRESH")) {
    if(!strcmp(getenv("SST_SCREENREFRESH"),"60"))
      refresh=GR_REFRESH_60Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"70"))
      refresh=GR_REFRESH_70Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"72"))
      refresh=GR_REFRESH_72Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"75"))
      refresh=GR_REFRESH_75Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"80"))
      refresh=GR_REFRESH_80Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"85"))
      refresh=GR_REFRESH_85Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"90"))
      refresh=GR_REFRESH_90Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"100"))
      refresh=GR_REFRESH_100Hz;
    if(!strcmp(getenv("SST_SCREENREFRESH"),"120"))
      refresh=GR_REFRESH_120Hz;
  }

  aux=0;
  for(i=0;attribList[i]!=FXMESA_NONE;i++)
    if((attribList[i]==FXMESA_ALPHA_SIZE) ||
       (attribList[i]==FXMESA_DEPTH_SIZE)) {
      if(attribList[++i]>0) {
        aux=1;
        break;
      }
    }

  res=fxBestResolution(width,height,aux);

  return fxMesaCreateContext(win,res,refresh,attribList);
}


#if 0
void fxsignals()
{
   signal(SIGINT,SIG_IGN);
   signal(SIGHUP,SIG_IGN);
   signal(SIGPIPE,SIG_IGN);
   signal(SIGFPE,SIG_IGN);
   signal(SIGBUS,SIG_IGN);
   signal(SIGILL,SIG_IGN);
   signal(SIGSEGV,SIG_IGN);
   signal(SIGTERM,SIG_IGN);
}
#endif

/*
 * Create a new FX/Mesa context and return a handle to it.
 */
fxMesaContext GLAPIENTRY fxMesaCreateContext(GLuint win,
                                             GrScreenResolution_t res,
                                             GrScreenRefresh_t ref,
                                             const GLint attribList[])
{
   fxMesaContext fxMesa = NULL;
   int i,type;
   int aux;
   GLboolean doubleBuffer=GL_FALSE;
   GLboolean alphaBuffer=GL_FALSE;
   GLboolean verbose=GL_FALSE;
   GLint depthSize=0;
   GLint stencilSize=0;
   GLint accumSize=0;
   GLcontext *shareCtx = NULL;
   GLcontext *ctx = 0;
   /*FX_GrContext_t glideContext = 0;*/
   char *errorstr;
   GLboolean useBGR;
   char *system = NULL;

   if (MESA_VERBOSE&VERBOSE_DRIVER) {
      fprintf(stderr,"fxmesa: fxMesaCreateContext() Start\n");
   }

   if(getenv("MESA_FX_INFO"))
      verbose=GL_TRUE;

   aux=0;
   i=0;
   while(attribList[i]!=FXMESA_NONE) {
      switch (attribList[i]) {
      case FXMESA_DOUBLEBUFFER:
	 doubleBuffer=GL_TRUE;
	 break;
      case FXMESA_ALPHA_SIZE:
	 i++;
	 alphaBuffer=attribList[i]>0;
	 if(alphaBuffer)
	    aux=1;
	 break;
      case FXMESA_DEPTH_SIZE:
	 i++;
	 depthSize=attribList[i];
	 if(depthSize) {
	    aux=1;
            depthSize = 16;
         }
	 break;
      case FXMESA_STENCIL_SIZE:
	 i++;
	 stencilSize=attribList[i];
	 break;
      case FXMESA_ACCUM_SIZE:
	 i++;
	 accumSize=attribList[i];
	 break;
	 /* XXX ugly hack here for sharing display lists */
#define FXMESA_SHARE_CONTEXT 990099  /* keep in sync with xmesa1.c! */
      case FXMESA_SHARE_CONTEXT:
	 i++;
	 {
	    const void *vPtr = &attribList[i];
	    GLcontext **ctx = (GLcontext **) vPtr;
	    shareCtx = *ctx;
	 }
	 break;
      default:
	 if (MESA_VERBOSE&VERBOSE_DRIVER) {
	    fprintf(stderr,"fxmesa: fxMesaCreateContext() End (defualt)\n");
	 }
	 return NULL;
      }
      i++;
   }

   /* A workaround for Linux GLQuake */
   if(depthSize && alphaBuffer)
      alphaBuffer=0;

   if ((type=fxQueryHardware()) < 0) {
      fprintf(stderr,"fx Driver: ERROR no Voodoo1/2 Graphics or Voodoo Rush !\n");
      return NULL;
   }

   if(type==GR_SSTTYPE_VOODOO)
      win=0;

   grSstSelect(glbCurrentBoard);

   fxMesa=(fxMesaContext)calloc(1,sizeof(struct tfxMesaContext));
   if(!fxMesa) {
      errorstr = "malloc";
      goto errorhandler;
   }

   if(glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_VOODOO)
      fxMesa->haveTwoTMUs=(glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig.nTexelfx > 1);
   else if(glbHWConfig.SSTs[glbCurrentBoard].type==GR_SSTTYPE_SST96)
      fxMesa->haveTwoTMUs=(glbHWConfig.SSTs[glbCurrentBoard].sstBoard.SST96Config.nTexelfx > 1);
   else
      fxMesa->haveTwoTMUs=GL_FALSE;

   fxMesa->haveDoubleBuffer=doubleBuffer;
   fxMesa->haveAlphaBuffer=alphaBuffer;
   fxMesa->haveGlobalPaletteTexture=GL_FALSE;
   fxMesa->haveZBuffer=depthSize ? 1 : 0;
   fxMesa->verbose=verbose;
   fxMesa->board=glbCurrentBoard;


   fxMesa->glideContext = FX_grSstWinOpen((FxU32)win,res,ref,
#if  FXMESA_USE_ARGB
					  GR_COLORFORMAT_ARGB,
#else
					  GR_COLORFORMAT_ABGR,
#endif
					  GR_ORIGIN_LOWER_LEFT,
					  2,aux);
   if (!fxMesa->glideContext){
      errorstr = "grSstWinOpen"; 
      goto errorhandler;
   }

   /*
    * Pixel tables are use during pixel read-back
    * Either initialize them for RGB or BGR order.
    */
#if FXMESA_USE_ARGB 
   useBGR = GL_FALSE; /* Force RGB pixel order */       
   system = "FXMESA_USE_ARGB";
#else
   if (glbHWConfig.SSTs[glbCurrentBoard].type == GR_SSTTYPE_VOODOO) {
      /* jk991130 - Voodoo 3s don't use BGR. Query the # of TMUs
       * as Voodoo3s have 2 TMUs on board, Banshee has only 1
       * bk000413 - another suggestion from Joseph Kain is using
       *  VendorID 0x121a for all 3dfx boards
       *   DeviceID VG  1/V2  2/VB  3/V3  5
       * For now we cehck for known BGR devices, and presume
       *  everything else to be a V3/RGB.
       */
      GrVoodooConfig_t *voodoo;
      voodoo = &glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig;

      if (voodoo->nTexelfx == 1) {
         /* Voodoo1 or Banshee */
         useBGR = GL_TRUE;
         system = "Voodoo1";
      }
      else if (voodoo->nTexelfx == 2 &&
               voodoo->fbiRev == 260 &&
               voodoo->tmuConfig[0].tmuRev == 4 &&
               (voodoo->tmuConfig[0].tmuRam == 2 ||
                voodoo->tmuConfig[0].tmuRam == 4)) {
         /* Voodoo 2 */
         useBGR = GL_TRUE;
         system = "Voodoo2";
      }
      else if (voodoo->nTexelfx == 2 &&
               voodoo->fbiRev == 2 &&
               voodoo->tmuConfig[0].tmuRev == 1 &&
               voodoo->tmuConfig[0].tmuRam == 4) {
         /* Quantum3D Obsidian 50/100 */
         useBGR = GL_TRUE;
         system = "Quantum3D Obsidian";
      }
      else 
         /* Brian
          *       (voodoo->nTexelfx == 2 &&
          *        voodoo->fbiRev == 0 &&
          *        voodoo->tmuConfig[0].tmuRev == 148441048 &&
          *        voodoo->tmuConfig[0].tmuRam == 3)
          * Bernd 
          *       (voodoo->nTexelfx == 2 &&
          *        voodoo->fbiRev ==  69634 &&
          *        voodoo->tmuConfig[0].tmuRev == 69634 &&
          *        voodoo->tmuConfig[0].tmuRam == 2 )
          */
      {
         /* Presumed Voodoo3 */
         useBGR =  GL_FALSE;
         system = "Voodoo3";
      }
      if (getenv("MESA_FX_INFO")) { 
        printf("Voodoo: Texelfx: %d / FBI Rev.: %d / TMU Rev.: %d / TMU RAM: %d\n",
               voodoo->nTexelfx,
               voodoo->fbiRev,
               voodoo->tmuConfig[0].tmuRev,
               voodoo->tmuConfig[0].tmuRam );
      }
   }
   else {
      useBGR = GL_FALSE; /* use RGB pixel order otherwise */
      system = "non-voodoo";
   }
#endif /*FXMESA_USE_ARGB*/

   if (getenv("MESA_FX_INFO")) 
      printf("Voodoo pixel order: %s (%s)\n", useBGR ? "BGR" : "RGB", system);

   fxInitPixelTables(fxMesa, useBGR);

   fxMesa->width=FX_grSstScreenWidth();
   fxMesa->height=FX_grSstScreenHeight();

   fxMesa->clipMinX = 0;
   fxMesa->clipMaxX = fxMesa->width;
   fxMesa->clipMinY = 0;
   fxMesa->clipMaxY = fxMesa->height;

   fxMesa->screen_width = fxMesa->width;
   fxMesa->screen_height = fxMesa->height;
   
   fxMesa->new_state = ~0;

   if(verbose)
      fprintf(stderr,"Voodoo Glide screen size: %dx%d\n",
              (int)FX_grSstScreenWidth(),(int)FX_grSstScreenHeight());

   fxMesa->glVis=_mesa_create_visual(GL_TRUE,     /* RGB mode */
                                     doubleBuffer,
                                     GL_FALSE,    /* stereo */
                                     5,6,5,0,     /* RGBA bits */
                                     0,           /* index bits */
                                     depthSize,   /* depth_size */
                                     stencilSize, /* stencil_size */
                                     accumSize, accumSize, accumSize, accumSize,
                                     1 );
   if (!fxMesa->glVis) {
      errorstr = "_mesa_create_visual";
      goto errorhandler;
   }

   ctx = fxMesa->glCtx=_mesa_create_context(fxMesa->glVis,
					 shareCtx,  /* share list context */
					 (void *) fxMesa, GL_TRUE);
   if (!ctx) {
      errorstr = "_mesa_create_context";
      goto errorhandler;
   }


   if (!fxDDInitFxMesaContext( fxMesa )) {
      errorstr = "fxDDInitFxMesaContext failed"; 
      goto errorhandler;
   }


   fxMesa->glBuffer=_mesa_create_framebuffer(fxMesa->glVis,
                                          GL_FALSE,  /* no software depth */
                                          fxMesa->glVis->stencilBits > 0,
                                          fxMesa->glVis->accumRedBits > 0,
                                          fxMesa->glVis->alphaBits > 0 );
   if (!fxMesa->glBuffer) {
      errorstr = "_mesa_create_framebuffer";
      goto errorhandler;
   }
  
   glbTotNumCtx++;

   /* install signal handlers */
#if defined(__linux__)
   /* Only install if environment var. is not set. */
   if (fxMesa->glCtx->CatchSignals && !getenv("MESA_FX_NO_SIGNALS")) {
      signal(SIGINT,cleangraphics_handler);
      signal(SIGHUP,cleangraphics_handler);
      signal(SIGPIPE,cleangraphics_handler);
      signal(SIGFPE,cleangraphics_handler);
      signal(SIGBUS,cleangraphics_handler);
      signal(SIGILL,cleangraphics_handler);
      signal(SIGSEGV,cleangraphics_handler);
      signal(SIGTERM,cleangraphics_handler);
   }
#endif

   if (MESA_VERBOSE&VERBOSE_DRIVER) {
      fprintf(stderr,"fxmesa: fxMesaCreateContext() End\n");
   }

   return fxMesa;

 errorhandler:
   if (fxMesa) {
      if (fxMesa->glideContext)
	 FX_grSstWinClose(fxMesa->glideContext);
      fxMesa->glideContext = 0;
      
      if (fxMesa->state)  
	 free(fxMesa->state);
      if (fxMesa->fogTable)
	 free(fxMesa->fogTable);
      if (fxMesa->glBuffer)
	 _mesa_destroy_framebuffer(fxMesa->glBuffer);
      if (fxMesa->glVis)
	 _mesa_destroy_visual(fxMesa->glVis);
      if (fxMesa->glCtx)
	 _mesa_destroy_context(fxMesa->glCtx);
      free(fxMesa);
   }
   
   if (MESA_VERBOSE&VERBOSE_DRIVER) {
      fprintf(stderr,"fxmesa: fxMesaCreateContext() End (%s)\n",errorstr);
   }
   return NULL;
}


/*
 * Function to set the new window size in the context (mainly for the Voodoo Rush)
 */
void GLAPIENTRY fxMesaUpdateScreenSize(fxMesaContext fxMesa)
{
  fxMesa->width=FX_grSstScreenWidth();
  fxMesa->height=FX_grSstScreenHeight();
}


/*
 * Destroy the given FX/Mesa context.
 */
void GLAPIENTRY fxMesaDestroyContext(fxMesaContext fxMesa)
{
   if (MESA_VERBOSE&VERBOSE_DRIVER) {
      fprintf(stderr,"fxmesa: fxMesaDestroyContext()\n");
   }

   if(!fxMesa) 
      return;

   if(fxMesa->verbose) {
      fprintf(stderr,"Misc Stats:\n");
      fprintf(stderr,"  # swap buffer: %u\n",fxMesa->stats.swapBuffer);

      if(!fxMesa->stats.swapBuffer)
	 fxMesa->stats.swapBuffer=1;

      fprintf(stderr,"Textures Stats:\n");
      fprintf(stderr,"  Free texture memory on TMU0: %d:\n",fxMesa->freeTexMem[FX_TMU0]);
      if(fxMesa->haveTwoTMUs)
	 fprintf(stderr,"  Free texture memory on TMU1: %d:\n",fxMesa->freeTexMem[FX_TMU1]);
      fprintf(stderr,"  # request to TMM to upload a texture objects: %u\n",
	      fxMesa->stats.reqTexUpload);
      fprintf(stderr,"  # request to TMM to upload a texture objects per swapbuffer: %.2f\n",
	      fxMesa->stats.reqTexUpload/(float)fxMesa->stats.swapBuffer);
      fprintf(stderr,"  # texture objects uploaded: %u\n",
	      fxMesa->stats.texUpload);
      fprintf(stderr,"  # texture objects uploaded per swapbuffer: %.2f\n",
	      fxMesa->stats.texUpload/(float)fxMesa->stats.swapBuffer);
      fprintf(stderr,"  # MBs uploaded to texture memory: %.2f\n",
	      fxMesa->stats.memTexUpload/(float)(1<<20));
      fprintf(stderr,"  # MBs uploaded to texture memory per swapbuffer: %.2f\n",
	      (fxMesa->stats.memTexUpload/(float)fxMesa->stats.swapBuffer)/(float)(1<<20));
   }

   glbTotNumCtx--;
   
   fxDDDestroyFxMesaContext(fxMesa);
   _mesa_destroy_visual(fxMesa->glVis);
   _mesa_destroy_context(fxMesa->glCtx);
   _mesa_destroy_framebuffer(fxMesa->glBuffer);

   fxCloseHardware();
   FX_grSstWinClose(fxMesa->glideContext);

   free(fxMesa);

   if(fxMesa==fxMesaCurrentCtx)
      fxMesaCurrentCtx=NULL;
}


/*
 * Make the specified FX/Mesa context the current one.
 */
void GLAPIENTRY fxMesaMakeCurrent(fxMesaContext fxMesa)
{
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxMesaMakeCurrent(...) Start\n");
  }

  if(!fxMesa) {
    _mesa_make_current(NULL,NULL);
    fxMesaCurrentCtx=NULL;

    if (MESA_VERBOSE&VERBOSE_DRIVER) {
      fprintf(stderr,"fxmesa: fxMesaMakeCurrent(NULL) End\n");
    }

    return;
  }

  /* if this context is already the current one, we can return early */
  if (fxMesaCurrentCtx == fxMesa
      && fxMesaCurrentCtx->glCtx == _mesa_get_current_context()) {
     if (MESA_VERBOSE&VERBOSE_DRIVER) {
        fprintf(stderr,"fxmesa: fxMesaMakeCurrent(fxMesaCurrentCtx==fxMesa) End\n");
    }

    return;
  }

  if(fxMesaCurrentCtx)
    grGlideGetState((GrState*)fxMesaCurrentCtx->state);

  fxMesaCurrentCtx=fxMesa;

  grSstSelect(fxMesa->board);
  grGlideSetState((GrState*)fxMesa->state);

  _mesa_make_current(fxMesa->glCtx,fxMesa->glBuffer);

  fxSetupDDPointers(fxMesa->glCtx);

  /* The first time we call MakeCurrent we set the initial viewport size */
  if(fxMesa->glCtx->Viewport.Width==0)
    gl_Viewport(fxMesa->glCtx,0,0,fxMesa->width,fxMesa->height);

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxMesaMakeCurrent(...) End\n");
  }
}


#if 0
static void QueryCounters(void)
{
   static GLuint prevPassed = 0;
   static GLuint prevFailed = 0;
   GLuint failed, passed;
   GrSstPerfStats_t st;

   FX_grSstPerfStats(&st);
   failed = st.zFuncFail - st.aFuncFail - st.chromaFail;
   passed = st.pixelsIn - failed;
   printf("failed: %d  passed: %d\n", failed - prevFailed, passed - prevPassed);

   prevPassed = passed;
   prevFailed = failed;
}
#endif


/*
 * Swap front/back buffers for current context if double buffered.
 */
void GLAPIENTRY fxMesaSwapBuffers(void)
{
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: ------------------------------- fxMesaSwapBuffers() -------------------------------\n");
  }

  if(fxMesaCurrentCtx) {
     _mesa_swapbuffers( fxMesaCurrentCtx->glCtx );

    if(fxMesaCurrentCtx->haveDoubleBuffer) {

      grBufferSwap(fxMesaCurrentCtx->swapInterval);

      /*
       * Don't allow swap buffer commands to build up!
       */
      while(FX_grGetInteger(FX_PENDING_BUFFERSWAPS)>fxMesaCurrentCtx->maxPendingSwapBuffers)
        /* The driver is able to sleep when waiting for the completation
           of multiple swapbuffer operations instead of wasting
           CPU time (NOTE: you must uncomment the following line in the
           in order to enable this option) */
        /* usleep(10000); */
        ;

      fxMesaCurrentCtx->stats.swapBuffer++;
    }
  }
}


/*
 * Query 3Dfx hardware presence/kind
 */
int GLAPIENTRY fxQueryHardware(void)
{
  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxQueryHardware() Start\n");
  }

  if (!glbGlideInitialized) {
    grGlideInit();
    if (FX_grSstQueryHardware(&glbHWConfig)) {
      grSstSelect(glbCurrentBoard);
      glb3DfxPresent = 1;

      if (getenv("MESA_FX_INFO")) {
        char buf[80];
                        
        FX_grGlideGetVersion(buf);
        fprintf(stderr, "Voodoo Using Glide V%s\n", buf);
        fprintf(stderr, "Voodoo Number of boards: %d\n", glbHWConfig.num_sst);

        if (glbHWConfig.SSTs[glbCurrentBoard].type == GR_SSTTYPE_VOODOO) {
          GrVoodooConfig_t *voodoo;
          voodoo = &glbHWConfig.SSTs[glbCurrentBoard].sstBoard.VoodooConfig;

          fprintf(stderr, "Voodoo Framebuffer RAM: %d\n",
            voodoo->sliDetect ? (voodoo->fbRam*2) : voodoo->fbRam);
          fprintf(stderr, "Voodoo Number of TMUs: %d\n", voodoo->nTexelfx);
          fprintf(stderr, "Voodoo fbRam: %d\n", voodoo->fbRam);
          fprintf(stderr, "Voodoo fbiRev: %d\n", voodoo->fbiRev);

          fprintf(stderr,"Voodoo SLI detected: %d\n", voodoo->sliDetect);
        }
        else if (glbHWConfig.SSTs[glbCurrentBoard].type == GR_SSTTYPE_SST96) {
          GrSst96Config_t *sst96;
          sst96 = &glbHWConfig.SSTs[glbCurrentBoard].sstBoard.SST96Config;
          fprintf(stderr, "Voodoo Framebuffer RAM: %d\n", sst96->fbRam);
          fprintf(stderr, "Voodoo Number of TMUs: %d\n", sst96->nTexelfx);
        }

      }
    }
    else {
      glb3DfxPresent = 0;
    }

    glbGlideInitialized = 1;

#if defined(__WIN32__)
    onexit((_onexit_t)cleangraphics);
#elif defined(__linux__)
    /* Only register handler if environment variable is not defined. */
    if (!getenv("MESA_FX_NO_SIGNALS")) {
	atexit(cleangraphics);
    }
#endif
  }

  if (MESA_VERBOSE&VERBOSE_DRIVER) {
    fprintf(stderr,"fxmesa: fxQueryHardware() End (voodooo)\n");
  }

  return glbHWConfig.SSTs[glbCurrentBoard].type;
}


/*
 * Shutdown Glide library
 */
void GLAPIENTRY fxCloseHardware(void)
{
  if (glbGlideInitialized) {
    if (getenv("MESA_FX_INFO")) {
      GrSstPerfStats_t          st;

      FX_grSstPerfStats(&st);
      fprintf(stderr,"Pixels Stats:\n");
      fprintf(stderr,"  # pixels processed (minus buffer clears): %u\n",(unsigned)st.pixelsIn);
      fprintf(stderr,"  # pixels not drawn due to chroma key test failure: %u\n",(unsigned)st.chromaFail);
      fprintf(stderr,"  # pixels not drawn due to depth test failure: %u\n",(unsigned)st.zFuncFail);
      fprintf(stderr,"  # pixels not drawn due to alpha test failure: %u\n",(unsigned)st.aFuncFail);
      fprintf(stderr,"  # pixels drawn (including buffer clears and LFB writes): %u\n",(unsigned)st.pixelsOut);
    }

    if (glbTotNumCtx == 0) {
      grGlideShutdown();
      glbGlideInitialized = 0;
    }
  }
}


#else


/*
 * Need this to provide at least one external definition.
 */
extern int gl_fx_dummy_function_api(void);
int gl_fx_dummy_function_api(void)
{
  return 0;
}

#endif  /* FX */