svgamesa.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/* $Id: svgamesa.c,v 1.27 2006/10/15 18:51:22 brianp Exp $ */

/*
 * Mesa 3-D graphics library
 * Version:  5.0
 * Copyright (C) 1995-2002  Brian Paul
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */


/*
 * SVGA driver for Mesa.
 * Original author:  Brian Paul
 * Additional authors:  Slawomir Szczyrba <[e-mail]>  (Mesa 3.2)
 */


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

#ifdef SVGA

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <vga.h>
#include "GL/svgamesa.h"
#include "buffers.h"
#include "context.h"
#include "extensions.h"
#include "imports.h"
#include "matrix.h"
#include "mtypes.h"
#include "swrast/swrast.h"
#include "svgapix.h"
#include "svgamesa8.h"
#include "svgamesa15.h"
#include "svgamesa16.h"
#include "svgamesa24.h"
#include "svgamesa32.h"

struct svga_buffer SVGABuffer;
vga_modeinfo * SVGAInfo;
SVGAMesaContext SVGAMesa;    /* the current context */

#ifdef SVGA_DEBUG

#include <sys/types.h>
#include <signal.h>

FILE * logfile;
char cbuf[1024]={0};

void SVGAlog(char * what)
{
 logfile=fopen("svgamesa.log","a");
 if (!logfile) return;
 fprintf(logfile,"%s\n",what);
 fclose(logfile);
}
#endif

/**********************************************************************/
/*****                       Init stuff...                        *****/
/**********************************************************************/

int SVGAMesaInit( int GraphMode )
{
   vga_init();
   if (!vga_hasmode(GraphMode))
   {
    fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
#ifdef SVGA_DEBUG
    SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
#endif
    return(1);
   }
   SVGAInfo=vga_getmodeinfo(GraphMode);
   if (SVGAInfo->flags & IS_MODEX)
   {
    fprintf(stderr,"ModeX not implemented...");
#ifdef SVGA_DEBUG
    SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
#endif
    return(2);
   }
   if (!SVGAInfo->bytesperpixel)
   {
    fprintf(stderr,"1 / 4 bit color not implemented...");
#ifdef SVGA_DEBUG
    SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
#endif
    return(3);
   }
   switch (SVGAInfo->colors) {
    case   256: SVGABuffer.Depth = 8;  break;
    case 32768: SVGABuffer.Depth = 15; break;
    case 65536: SVGABuffer.Depth = 16; break;
    default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
   }
   SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
#ifdef SVGA_DEBUG
   sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
                 "              depth  : %d\n" \
                 "              mode   : %d\n" \
		 "              width  : %d\n" \
		 "              height : %d\n" \
		 "              bufsize: %d\n", \
		 SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
		 SVGAInfo->height,SVGABuffer.BufferSize);
   SVGAlog(cbuf);
#endif
   SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
   if (!SVGABuffer.FrontBuffer) {
    {
     fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
#ifdef SVGA_DEBUG
     SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
#endif
     return(4);
    }
   }
#ifdef SVGA_DEBUG
   sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
   SVGAlog(cbuf);
#endif
   SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
   if (!SVGABuffer.BackBuffer) {
    {
     free(SVGABuffer.FrontBuffer);
     fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
#ifdef SVGA_DEBUG
     SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
#endif
     return(5);
    }
   }
#ifdef SVGA_DEBUG
   sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
   SVGAlog(cbuf);
#endif

   vga_setmode(GraphMode);
   SVGABuffer.VideoRam=vga_getgraphmem();
#ifdef SVGA_DEBUG
   sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
   SVGAlog(cbuf);
   sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
   SVGAlog(cbuf);
#endif

   SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
   SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;

   return 0;
}

int SVGAMesaClose( void )
{
   vga_setmode(TEXT);
   free(SVGABuffer.FrontBuffer);
   free(SVGABuffer.BackBuffer);
   return 0;
}

void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
{
   if (ndx<256)
      vga_setpalette(ndx, red>>2, green>>2, blue>>2);
}

/**********************************************************************/
/*****                 Miscellaneous functions                    *****/
/**********************************************************************/

static void copy_buffer( const GLubyte * buffer) {
 int size = SVGABuffer.BufferSize, page = 0;

#ifdef SVGA_DEBUG
   sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
   SVGAlog(cbuf);
#endif

 while(size>0) {
 vga_setpage(page++);
  if (size>>16) {
   memcpy(SVGABuffer.VideoRam,buffer,0x10000);
   buffer+=0x10000;
  }else{
   memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
  }
  size-=0xffff;
 }
}

static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
{
   *width = SVGAMesa->width = vga_getxdim();
   *height = SVGAMesa->height = vga_getydim();
}

/**
 * We only implement this function as a mechanism to check if the
 * framebuffer size has changed (and update corresponding state).
 */
static void viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
   GLuint newWidth, newHeight;
   GLframebuffer *buffer = ctx->WinSysDrawBuffer;
   get_buffer_size( buffer, &newWidth, &newHeight );
   if (buffer->Width != newWidth || buffer->Height != newHeight) {
      _mesa_resize_framebuffer(ctx, buffer, newWidth, newHeight );
   }
}

static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
                        GLenum buffer )
{
   /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
    * function.
    */
   (void) colorBuffer;

   if (buffer == GL_FRONT_LEFT) {
      SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
      SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
#if 0
      void * tmpptr;
      /*    vga_waitretrace(); */
      copy_buffer(SVGABuffer.FrontBuffer);
      tmpptr=SVGABuffer.BackBuffer;
      SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
      SVGABuffer.FrontBuffer=tmpptr;
#endif
   }
   else if (buffer == GL_BACK_LEFT) {
      SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
      SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
#if 0
      /*    vga_waitretrace(); */
      copy_buffer(SVGABuffer.BackBuffer);
#endif
   }
}