path: root/plugins/gpu-gles/gpulib_if.c

/***************************************************************************
    begin                : Sun Mar 08 2009
    copyright            : (C) 1999-2009 by Pete Bernert
    email                : BlackDove@addcom.de

    PCSX rearmed rework (C) notaz, 2012
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version. See also the license.txt file for *
 *   additional informations.                                              *
 *                                                                         *
 ***************************************************************************/

#include "gpuDraw.c"
#include "gpuTexture.c"
#include "gpuPrim.c"
#include "hud.c"

static const short dispWidths[8] = {256,320,512,640,368,384,512,640};
short g_m1,g_m2,g_m3;
short DrawSemiTrans;

short          ly0,lx0,ly1,lx1,ly2,lx2,ly3,lx3;        // global psx vertex coords
long           GlobalTextAddrX,GlobalTextAddrY,GlobalTextTP;
long           GlobalTextREST,GlobalTextABR,GlobalTextPAGE;

unsigned long dwGPUVersion;
int           iGPUHeight=512;
int           iGPUHeightMask=511;
int           GlobalTextIL;

unsigned char  *psxVub;
unsigned short *psxVuw;

GLfloat         gl_z=0.0f;
BOOL            bNeedInterlaceUpdate;
BOOL            bNeedRGB24Update;
BOOL            bChangeWinMode;
long            lGPUstatusRet;
unsigned long   ulGPUInfoVals[16];
VRAMLoad_t      VRAMWrite;
VRAMLoad_t      VRAMRead;
int             iDataWriteMode;
int             iDataReadMode;

long            lClearOnSwap;
long            lClearOnSwapColor;
BOOL            bSkipNextFrame;

PSXDisplay_t    PSXDisplay;
PSXDisplay_t    PreviousPSXDisplay;
TWin_t          TWin;
BOOL            bDisplayNotSet;
BOOL            bNeedWriteUpload;
int             iLastRGB24;

// don't do GL vram read
void CheckVRamRead(int x, int y, int dx, int dy, bool bFront)
{
}

void CheckVRamReadEx(int x, int y, int dx, int dy)
{
}

void SetFixes(void)
{
}

static void PaintBlackBorders(void)
{
 short s;
 glDisable(GL_SCISSOR_TEST); glError();
 if(bTexEnabled) {glDisable(GL_TEXTURE_2D);bTexEnabled=FALSE;} glError();
 if(bOldSmoothShaded) {glShadeModel(GL_FLAT);bOldSmoothShaded=FALSE;} glError();
 if(bBlendEnable)     {glDisable(GL_BLEND);bBlendEnable=FALSE;} glError();
 glDisable(GL_ALPHA_TEST); glError();

 glEnable(GL_ALPHA_TEST); glError();
 glEnable(GL_SCISSOR_TEST); glError();
}

static void fps_update(void);

void updateDisplay(void)
{
 bFakeFrontBuffer=FALSE;
 bRenderFrontBuffer=FALSE;

 if(PSXDisplay.RGB24)// && !bNeedUploadAfter)         // (mdec) upload wanted?
 {
  PrepareFullScreenUpload(-1);
  UploadScreen(PSXDisplay.Interlaced);                // -> upload whole screen from psx vram
  bNeedUploadTest=FALSE;
  bNeedInterlaceUpdate=FALSE;
  bNeedUploadAfter=FALSE;
  bNeedRGB24Update=FALSE;
 }
 else
 if(bNeedInterlaceUpdate)                             // smaller upload?
 {
  bNeedInterlaceUpdate=FALSE;
  xrUploadArea=xrUploadAreaIL;                        // -> upload this rect
  UploadScreen(TRUE);
 }

 if(dwActFixes&512) bCheckFF9G4(NULL);                // special game fix for FF9 

 if(PSXDisplay.Disabled)                              // display disabled?
 {
  // moved here
  glDisable(GL_SCISSOR_TEST); glError();                       
  glClearColor(0,0,0,128); glError();                 // -> clear whole backbuffer
  glClear(uiBufferBits); glError();
  glEnable(GL_SCISSOR_TEST); glError();                       
  gl_z=0.0f;
  bDisplayNotSet = TRUE;
 }

 if(iDrawnSomething)
 {
  fps_update();
  eglSwapBuffers(display, surface);
  iDrawnSomething=0;
 }

 if(lClearOnSwap)                                     // clear buffer after swap?
 {
  GLclampf g,b,r;

  if(bDisplayNotSet)                                  // -> set new vals
   SetOGLDisplaySettings(1);

  g=((GLclampf)GREEN(lClearOnSwapColor))/255.0f;      // -> get col
  b=((GLclampf)BLUE(lClearOnSwapColor))/255.0f;
  r=((GLclampf)RED(lClearOnSwapColor))/255.0f;
  glDisable(GL_SCISSOR_TEST); glError();                       
  glClearColor(r,g,b,128); glError();                 // -> clear 
  glClear(uiBufferBits); glError();
  glEnable(GL_SCISSOR_TEST); glError();                       
  lClearOnSwap=0;                                     // -> done
 }
 else 
 {
  if(iZBufferDepth)                                   // clear zbuffer as well (if activated)
   {
    glDisable(GL_SCISSOR_TEST); glError();
    glClear(GL_DEPTH_BUFFER_BIT); glError();
    glEnable(GL_SCISSOR_TEST); glError();
   }
 }
 gl_z=0.0f;

 // additional uploads immediatly after swapping
 if(bNeedUploadAfter)                                 // upload wanted?
 {
  bNeedUploadAfter=FALSE;                           
  bNeedUploadTest=FALSE;
  UploadScreen(-1);                                   // -> upload
 }

 if(bNeedUploadTest)
 {
  bNeedUploadTest=FALSE;
  if(PSXDisplay.InterlacedTest &&
     //iOffscreenDrawing>2 &&
     PreviousPSXDisplay.DisplayPosition.x==PSXDisplay.DisplayPosition.x &&
     PreviousPSXDisplay.DisplayEnd.x==PSXDisplay.DisplayEnd.x &&
     PreviousPSXDisplay.DisplayPosition.y==PSXDisplay.DisplayPosition.y &&
     PreviousPSXDisplay.DisplayEnd.y==PSXDisplay.DisplayEnd.y)
   {
    PrepareFullScreenUpload(TRUE);
    UploadScreen(TRUE);
   }
 }
}

void updateFrontDisplay(void)
{
 if(PreviousPSXDisplay.Range.x0||
    PreviousPSXDisplay.Range.y0)
  PaintBlackBorders();

 bFakeFrontBuffer=FALSE;
 bRenderFrontBuffer=FALSE;

 if(iDrawnSomething)                                  // linux:
  eglSwapBuffers(display, surface);
}

static void ChangeDispOffsetsX(void)                  // CENTER X
{
long lx,l;short sO;

if(!PSXDisplay.Range.x1) return;                      // some range given?

l=PSXDisplay.DisplayMode.x;

l*=(long)PSXDisplay.Range.x1;                         // some funky calculation
l/=2560;lx=l;l&=0xfffffff8;

if(l==PreviousPSXDisplay.Range.x1) return;            // some change?

sO=PreviousPSXDisplay.Range.x0;                       // store old

if(lx>=PSXDisplay.DisplayMode.x)                      // range bigger?
 {
  PreviousPSXDisplay.Range.x1=                        // -> take display width
   PSXDisplay.DisplayMode.x;
  PreviousPSXDisplay.Range.x0=0;                      // -> start pos is 0
 }
else                                                  // range smaller? center it
 {
  PreviousPSXDisplay.Range.x1=l;                      // -> store width (8 pixel aligned)
   PreviousPSXDisplay.Range.x0=                       // -> calc start pos
   (PSXDisplay.Range.x0-500)/8;
  if(PreviousPSXDisplay.Range.x0<0)                   // -> we don't support neg. values yet
   PreviousPSXDisplay.Range.x0=0;

  if((PreviousPSXDisplay.Range.x0+lx)>                // -> uhuu... that's too much
     PSXDisplay.DisplayMode.x)
   {
    PreviousPSXDisplay.Range.x0=                      // -> adjust start
     PSXDisplay.DisplayMode.x-lx;
    PreviousPSXDisplay.Range.x1+=lx-l;                // -> adjust width
   }                   
 }

if(sO!=PreviousPSXDisplay.Range.x0)                   // something changed?
 {
  bDisplayNotSet=TRUE;                                // -> recalc display stuff
 }
}

////////////////////////////////////////////////////////////////////////

static void ChangeDispOffsetsY(void)                  // CENTER Y
{
int iT;short sO;                                      // store previous y size

if(PSXDisplay.PAL) iT=48; else iT=28;                 // different offsets on PAL/NTSC

if(PSXDisplay.Range.y0>=iT)                           // crossed the security line? :)
 {
  PreviousPSXDisplay.Range.y1=                        // -> store width
   PSXDisplay.DisplayModeNew.y;
  
  sO=(PSXDisplay.Range.y0-iT-4)*PSXDisplay.Double;    // -> calc offset
  if(sO<0) sO=0;

  PSXDisplay.DisplayModeNew.y+=sO;                    // -> add offset to y size, too
 }
else sO=0;                                            // else no offset

if(sO!=PreviousPSXDisplay.Range.y0)                   // something changed?
 {
  PreviousPSXDisplay.Range.y0=sO;
  bDisplayNotSet=TRUE;                                // -> recalc display stuff
 }
}

static void updateDisplayIfChanged(void)
{
BOOL bUp;

if ((PSXDisplay.DisplayMode.y == PSXDisplay.DisplayModeNew.y) && 
    (PSXDisplay.DisplayMode.x == PSXDisplay.DisplayModeNew.x))
 {
  if((PSXDisplay.RGB24      == PSXDisplay.RGB24New) && 
     (PSXDisplay.Interlaced == PSXDisplay.InterlacedNew)) 
     return;                                          // nothing has changed? fine, no swap buffer needed
 }
else                                                  // some res change?
 {
  glLoadIdentity(); glError();
  glOrtho(0,PSXDisplay.DisplayModeNew.x,              // -> new psx resolution
            PSXDisplay.DisplayModeNew.y, 0, -1, 1); glError();
  if(bKeepRatio) SetAspectRatio();
 }

bDisplayNotSet = TRUE;                                // re-calc offsets/display area

bUp=FALSE;
if(PSXDisplay.RGB24!=PSXDisplay.RGB24New)             // clean up textures, if rgb mode change (usually mdec on/off)
 {
  PreviousPSXDisplay.RGB24=0;                         // no full 24 frame uploaded yet
  ResetTextureArea(FALSE);
  bUp=TRUE;
 }

PSXDisplay.RGB24         = PSXDisplay.RGB24New;       // get new infos
PSXDisplay.DisplayMode.y = PSXDisplay.DisplayModeNew.y;
PSXDisplay.DisplayMode.x = PSXDisplay.DisplayModeNew.x;
PSXDisplay.Interlaced    = PSXDisplay.InterlacedNew;

PSXDisplay.DisplayEnd.x=                              // calc new ends
 PSXDisplay.DisplayPosition.x+ PSXDisplay.DisplayMode.x;
PSXDisplay.DisplayEnd.y=
 PSXDisplay.DisplayPosition.y+ PSXDisplay.DisplayMode.y+PreviousPSXDisplay.DisplayModeNew.y;
PreviousPSXDisplay.DisplayEnd.x=
 PreviousPSXDisplay.DisplayPosition.x+ PSXDisplay.DisplayMode.x;
PreviousPSXDisplay.DisplayEnd.y=
 PreviousPSXDisplay.DisplayPosition.y+ PSXDisplay.DisplayMode.y+PreviousPSXDisplay.DisplayModeNew.y;

ChangeDispOffsetsX();
if(bUp) updateDisplay();                              // yeah, real update (swap buffer)
}

#define GPUwriteStatus_ext GPUwriteStatus_ext // for gpulib to see this
void GPUwriteStatus_ext(unsigned long gdata)
{
switch((gdata>>24)&0xff)
 {
  case 0x00:
   PSXDisplay.Disabled=1;
   PSXDisplay.DrawOffset.x=PSXDisplay.DrawOffset.y=0;
   drawX=drawY=0;drawW=drawH=0;
   sSetMask=0;lSetMask=0;bCheckMask=FALSE;iSetMask=0;
   usMirror=0;
   GlobalTextAddrX=0;GlobalTextAddrY=0;
   GlobalTextTP=0;GlobalTextABR=0;
   PSXDisplay.RGB24=FALSE;
   PSXDisplay.Interlaced=FALSE;
   bUsingTWin = FALSE;
   return;

  case 0x03:  
   PreviousPSXDisplay.Disabled = PSXDisplay.Disabled;
   PSXDisplay.Disabled = (gdata & 1);

   if (iOffscreenDrawing==4 &&
        PreviousPSXDisplay.Disabled && 
       !(PSXDisplay.Disabled))
    {

     if(!PSXDisplay.RGB24)
      {
       PrepareFullScreenUpload(TRUE);
       UploadScreen(TRUE); 
       updateDisplay();
      }
    }
   return;

  case 0x05: 
   {
    short sx=(short)(gdata & 0x3ff);
    short sy;

    sy = (short)((gdata>>10)&0x3ff);             // really: 0x1ff, but we adjust it later
    if (sy & 0x200) 
     {
      sy|=0xfc00;
      PreviousPSXDisplay.DisplayModeNew.y=sy/PSXDisplay.Double;
      sy=0;
     }
    else PreviousPSXDisplay.DisplayModeNew.y=0;

    if(sx>1000) sx=0;

    if(dwActFixes&8) 
     {
      if((!PSXDisplay.Interlaced) &&
         PreviousPSXDisplay.DisplayPosition.x == sx  &&
         PreviousPSXDisplay.DisplayPosition.y == sy)
       return;

      PSXDisplay.DisplayPosition.x = PreviousPSXDisplay.DisplayPosition.x;
      PSXDisplay.DisplayPosition.y = PreviousPSXDisplay.DisplayPosition.y;
      PreviousPSXDisplay.DisplayPosition.x = sx;
      PreviousPSXDisplay.DisplayPosition.y = sy;
     }
    else
     {
      if((!PSXDisplay.Interlaced) &&
         PSXDisplay.DisplayPosition.x == sx  &&
         PSXDisplay.DisplayPosition.y == sy)
       return;
      PreviousPSXDisplay.DisplayPosition.x = PSXDisplay.DisplayPosition.x;
      PreviousPSXDisplay.DisplayPosition.y = PSXDisplay.DisplayPosition.y;
      PSXDisplay.DisplayPosition.x = sx;
      PSXDisplay.DisplayPosition.y = sy;
     }

    PSXDisplay.DisplayEnd.x=
     PSXDisplay.DisplayPosition.x+ PSXDisplay.DisplayMode.x;
    PSXDisplay.DisplayEnd.y=
     PSXDisplay.DisplayPosition.y+ PSXDisplay.DisplayMode.y+PreviousPSXDisplay.DisplayModeNew.y;

    PreviousPSXDisplay.DisplayEnd.x=
     PreviousPSXDisplay.DisplayPosition.x+ PSXDisplay.DisplayMode.x;
    PreviousPSXDisplay.DisplayEnd.y=
     PreviousPSXDisplay.DisplayPosition.y+ PSXDisplay.DisplayMode.y+PreviousPSXDisplay.DisplayModeNew.y;

    bDisplayNotSet = TRUE;

    if (!(PSXDisplay.Interlaced))
     {
      updateDisplay();
     }
    else
    if(PSXDisplay.InterlacedTest && 
       ((PreviousPSXDisplay.DisplayPosition.x != PSXDisplay.DisplayPosition.x)||
        (PreviousPSXDisplay.DisplayPosition.y != PSXDisplay.DisplayPosition.y)))
     PSXDisplay.InterlacedTest--;
    return;
   }

  case 0x06:
   PSXDisplay.Range.x0=gdata & 0x7ff;      //0x3ff;
   PSXDisplay.Range.x1=(gdata>>12) & 0xfff;//0x7ff;

   PSXDisplay.Range.x1-=PSXDisplay.Range.x0;

   ChangeDispOffsetsX();
   return;

  case 0x07:
   PreviousPSXDisplay.Height = PSXDisplay.Height;

   PSXDisplay.Range.y0=gdata & 0x3ff;
   PSXDisplay.Range.y1=(gdata>>10) & 0x3ff;

   PSXDisplay.Height = PSXDisplay.Range.y1 - 
                       PSXDisplay.Range.y0 +
                       PreviousPSXDisplay.DisplayModeNew.y;

   if (PreviousPSXDisplay.Height != PSXDisplay.Height)
    {
     PSXDisplay.DisplayModeNew.y=PSXDisplay.Height*PSXDisplay.Double;
     ChangeDispOffsetsY();
     updateDisplayIfChanged();
    }
   return;

  case 0x08:
   PSXDisplay.DisplayModeNew.x = dispWidths[(gdata & 0x03) | ((gdata & 0x40) >> 4)];

   if (gdata&0x04) PSXDisplay.Double=2;
   else            PSXDisplay.Double=1;
   PSXDisplay.DisplayModeNew.y = PSXDisplay.Height*PSXDisplay.Double;

   ChangeDispOffsetsY();
 
   PSXDisplay.PAL           = (gdata & 0x08)?TRUE:FALSE; // if 1 - PAL mode, else NTSC
   PSXDisplay.RGB24New      = (gdata & 0x10)?TRUE:FALSE; // if 1 - TrueColor
   PSXDisplay.InterlacedNew = (gdata & 0x20)?TRUE:FALSE; // if 1 - Interlace

   PreviousPSXDisplay.InterlacedNew=FALSE;
   if (PSXDisplay.InterlacedNew)
    {
     if(!PSXDisplay.Interlaced)
      {
       PSXDisplay.InterlacedTest=2;
       PreviousPSXDisplay.DisplayPosition.x = PSXDisplay.DisplayPosition.x;
       PreviousPSXDisplay.DisplayPosition.y = PSXDisplay.DisplayPosition.y;
       PreviousPSXDisplay.InterlacedNew=TRUE;
      }
    }
   else 
    {
     PSXDisplay.InterlacedTest=0;
    }
   updateDisplayIfChanged();
   return;
 }
}

/////////////////////////////////////////////////////////////////////////////

#include <stdint.h>

#include "../gpulib/gpu.c"

static int is_opened;

int renderer_init(void)
{
 psxVub=(void *)gpu.vram;
 psxVuw=(unsigned short *)psxVub;

 PSXDisplay.RGB24        = FALSE;                      // init some stuff
 PSXDisplay.Interlaced   = FALSE;
 PSXDisplay.DrawOffset.x = 0;
 PSXDisplay.DrawOffset.y = 0;
 PSXDisplay.DisplayMode.x= 320;
 PSXDisplay.DisplayMode.y= 240;
 PSXDisplay.Disabled     = FALSE;
 PSXDisplay.Range.x0=0;
 PSXDisplay.Range.x1=0;
 PSXDisplay.Double = 1;

 lGPUstatusRet = 0x14802000;

 return 0;
}

extern const unsigned char cmd_lengths[256];

// XXX: mostly dupe code from soft peops
int do_cmd_list(unsigned int *list, int list_len, int *last_cmd)
{
  unsigned int cmd, len;
  unsigned int *list_start = list;
  unsigned int *list_end = list + list_len;

  for (; list < list_end; list += 1 + len)
  {
    cmd = *list >> 24;
    len = cmd_lengths[cmd];
    if (list + 1 + len > list_end) {
      cmd = -1;
      break;
    }

#ifndef TEST
    if (cmd == 0xa0 || cmd == 0xc0)
      break; // image i/o, forward to upper layer
    else if ((cmd & 0xf8) == 0xe0)
      gpu.ex_regs[cmd & 7] = list[0];
#endif

    primTableJ[cmd]((void *)list);

    switch(cmd)
    {
      case 0x48 ... 0x4F:
      {
        uint32_t num_vertexes = 2;
        uint32_t *list_position = &(list[3]);

        while(1)
        {
          if((*list_position & 0xf000f000) == 0x50005000 || list_position >= list_end)
            break;

          list_position++;
          num_vertexes++;
        }

        len += (num_vertexes - 2);
        break;
      }

      case 0x58 ... 0x5F:
      {
        uint32_t num_vertexes = 2;
        uint32_t *list_position = &(list[4]);

        while(1)
        {
          if((*list_position & 0xf000f000) == 0x50005000 || list_position >= list_end)
            break;

          list_position += 2;
          num_vertexes++;
        }

        len += (num_vertexes - 2) * 2;
        break;
      }

#ifdef TEST
      case 0xA0:          //  sys -> vid
      {
        short *slist = (void *)list;
        uint32_t load_width = slist[4];
        uint32_t load_height = slist[5];
        uint32_t load_size = load_width * load_height;

        len += load_size / 2;
        break;
      }
#endif
    }
  }

  gpu.ex_regs[1] &= ~0x1ff;
  gpu.ex_regs[1] |= lGPUstatusRet & 0x1ff;

  *last_cmd = cmd;
  return list - list_start;
}

void renderer_sync_ecmds(uint32_t *ecmds)
{
  cmdTexturePage((unsigned char *)&ecmds[1]);
  cmdTextureWindow((unsigned char *)&ecmds[2]);
  cmdDrawAreaStart((unsigned char *)&ecmds[3]);
  cmdDrawAreaEnd((unsigned char *)&ecmds[4]);
  cmdDrawOffset((unsigned char *)&ecmds[5]);
  cmdSTP((unsigned char *)&ecmds[6]);
}

void renderer_update_caches(int x, int y, int w, int h)
{
 VRAMWrite.x = x;
 VRAMWrite.y = y;
 VRAMWrite.Width = w;
 VRAMWrite.Height = h;
 if(is_opened)
  CheckWriteUpdate();
}

void renderer_flush_queues(void)
{
}

void renderer_set_interlace(int enable, int is_odd)
{
}

int vout_init(void)
{
  return 0;
}

int vout_finish(void)
{
  return 0;
}

void vout_update(void)
{
 if(PSXDisplay.Interlaced)                            // interlaced mode?
 {
  if(PSXDisplay.DisplayMode.x>0 && PSXDisplay.DisplayMode.y>0)
   {
    updateDisplay();                                  // -> swap buffers (new frame)
   }
 }
 else if(bRenderFrontBuffer)                          // no interlace mode? and some stuff in front has changed?
 {
  updateFrontDisplay();                               // -> update front buffer
 }
}

void vout_blank(void)
{
}

void vout_set_config(const struct rearmed_cbs *cbs)
{
}

static struct rearmed_cbs *cbs;

long GPUopen(void **dpy)
{
 int ret;

 iResX = cbs->screen_w;
 iResY = cbs->screen_h;
 rRatioRect.left   = rRatioRect.top=0;
 rRatioRect.right  = iResX;
 rRatioRect.bottom = iResY;

 bDisplayNotSet = TRUE; 
 bSetClip = TRUE;
 CSTEXTURE = CSVERTEX = CSCOLOR = 0;

 InitializeTextureStore();                             // init texture mem

 ret = GLinitialize();
 MakeDisplayLists();

 is_opened = 1;
 return ret;
}

long GPUclose(void)
{
 is_opened = 0;

 KillDisplayLists();
 GLcleanup();                                          // close OGL
 return 0;
}

/* acting as both renderer and vout handler here .. */
void renderer_set_config(const struct rearmed_cbs *cbs_)
{
 cbs = (void *)cbs_; // ugh..

 iOffscreenDrawing = 0;
 iZBufferDepth = 0;
 iFrameReadType = 0;
 bKeepRatio = TRUE;

 dwActFixes = cbs->gpu_peopsgl.dwActFixes;
 bDrawDither = cbs->gpu_peopsgl.bDrawDither;
 iFilterType = cbs->gpu_peopsgl.iFilterType;
 iFrameTexType = cbs->gpu_peopsgl.iFrameTexType;
 iUseMask = cbs->gpu_peopsgl.iUseMask;
 bOpaquePass = cbs->gpu_peopsgl.bOpaquePass;
 bAdvancedBlend = cbs->gpu_peopsgl.bAdvancedBlend;
 bUseFastMdec = cbs->gpu_peopsgl.bUseFastMdec;
 iTexGarbageCollection = cbs->gpu_peopsgl.iTexGarbageCollection;
 iVRamSize = cbs->gpu_peopsgl.iVRamSize;
}

void SetAspectRatio(void)
{
 if (cbs->pl_get_layer_pos)
  cbs->pl_get_layer_pos(&rRatioRect.left, &rRatioRect.top, &rRatioRect.right, &rRatioRect.bottom);

 glScissor(rRatioRect.left,
           iResY-(rRatioRect.top+rRatioRect.bottom),
	   rRatioRect.right,rRatioRect.bottom);
 glViewport(rRatioRect.left,
           iResY-(rRatioRect.top+rRatioRect.bottom),
           rRatioRect.right,rRatioRect.bottom);
 glError();
}

static void fps_update(void)
{
 char buf[16];

 cbs->flip_cnt++;
 if(cbs->flips_per_sec != 0)
 {
  snprintf(buf,sizeof(buf),"%2d %4.1f",cbs->flips_per_sec,cbs->vsps_cur);
  DisplayText(buf, 0);
 }
 if(cbs->cpu_usage != 0)
 {
  snprintf(buf,sizeof(buf),"%3d",cbs->cpu_usage);
  DisplayText(buf, 1);
 }
}