src/mesa/drivers/svga/svgamesa.c

   1 /* $Id: svgamesa.c,v 1.7 2000/11/14 17:40:14 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.3
   6  * Copyright (C) 1995-2000  Brian Paul
   7  *
   8  * This library is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Library General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2 of the License, or (at your option) any later version.
  12  *
  13  * This library is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Library General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Library General Public
  19  * License along with this library; if not, write to the Free
  20  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  */
  22
  23
  24 /*
  25  * SVGA driver for Mesa.
  26  * Original author:  Brian Paul
  27  * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
  28  */
  29
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "conf.h"
  33 #endif
  34
  35 #ifdef SVGA
  36
  37 #ifdef PC_HEADER
  38 #include "all.h"
  39 #else
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <vga.h>
  43 #include "GL/svgamesa.h"
  44 #include "context.h"
  45 #include "matrix.h"
  46 #include "types.h"
  47 #include <string.h>
  48 #endif
  49
  50 #include "svgapix.h"
  51 #include "svgamesa8.h"
  52 #include "svgamesa15.h"
  53 #include "svgamesa16.h"
  54 #include "svgamesa24.h"
  55 #include "svgamesa32.h"
  56
  57 struct svga_buffer SVGABuffer;
  58 vga_modeinfo * SVGAInfo;
  59 SVGAMesaContext SVGAMesa;    /* the current context */
  60
  61 #ifdef SVGA_DEBUG
  62
  63 #include <sys/types.h>
  64 #include <signal.h>
  65
  66 FILE * logfile;
  67 char cbuf[1024]={0};
  68
  69 void SVGAlog(char * what)
  70 {
  71  logfile=fopen("svgamesa.log","a");
  72  if (!logfile) return;
  73  fprintf(logfile,"%s\n",what);
  74  fclose(logfile);
  75 }
  76 #endif
  77
  78 /**********************************************************************/
  79 /*****                       Init stuff...                        *****/
  80 /**********************************************************************/
  81
  82 int SVGAMesaInit( int GraphMode )
  83 {
  84    vga_init();
  85    if (!vga_hasmode(GraphMode))
  86    {
  87     fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
  88 #ifdef SVGA_DEBUG
  89     SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
  90 #endif
  91     return(1);
  92    }
  93    SVGAInfo=vga_getmodeinfo(GraphMode);
  94    if (SVGAInfo->flags & IS_MODEX)
  95    {
  96     fprintf(stderr,"ModeX not implemented...");
  97 #ifdef SVGA_DEBUG
  98     SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
  99 #endif
 100     return(2);
 101    }
 102    if (!SVGAInfo->bytesperpixel)
 103    {
 104     fprintf(stderr,"1 / 4 bit color not implemented...");
 105 #ifdef SVGA_DEBUG
 106     SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
 107 #endif
 108     return(3);
 109    }
 110    switch (SVGAInfo->colors) {
 111     case   256: SVGABuffer.Depth = 8;  break;
 112     case 32768: SVGABuffer.Depth = 15; break;
 113     case 65536: SVGABuffer.Depth = 16; break;
 114     default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
 115    }
 116    SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
 117 #ifdef SVGA_DEBUG
 118    sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
 119                  "              depth  : %d\n" \
 120                  "              mode   : %d\n" \
 121                  "              width  : %d\n" \
 122                  "              height : %d\n" \
 123                  "              bufsize: %d\n", \
 124                  SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
 125                  SVGAInfo->height,SVGABuffer.BufferSize);
 126    SVGAlog(cbuf);
 127 #endif
 128    SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 129    if (!SVGABuffer.FrontBuffer) {
 130     {
 131      fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
 132 #ifdef SVGA_DEBUG
 133      SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
 134 #endif
 135      return(4);
 136     }
 137    }
 138 #ifdef SVGA_DEBUG
 139    sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
 140    SVGAlog(cbuf);
 141 #endif
 142    SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 143    if (!SVGABuffer.BackBuffer) {
 144     {
 145      free(SVGABuffer.FrontBuffer);
 146      fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
 147 #ifdef SVGA_DEBUG
 148      SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
 149 #endif
 150      return(5);
 151     }
 152    }
 153 #ifdef SVGA_DEBUG
 154    sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
 155    SVGAlog(cbuf);
 156 #endif
 157
 158    vga_setmode(GraphMode);
 159    SVGABuffer.VideoRam=vga_getgraphmem();
 160 #ifdef SVGA_DEBUG
 161    sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
 162    SVGAlog(cbuf);
 163    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
 164    SVGAlog(cbuf);
 165 #endif
 166
 167    SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 168    SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 169
 170    return 0;
 171 }
 172
 173 int SVGAMesaClose( void )
 174 {
 175    vga_setmode(TEXT);
 176    free(SVGABuffer.FrontBuffer);
 177    free(SVGABuffer.BackBuffer);
 178    return 0;
 179 }
 180
 181 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 182 {
 183    if (ndx<256)
 184       vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 185 }
 186
 187 /**********************************************************************/
 188 /*****                 Miscellaneous functions                    *****/
 189 /**********************************************************************/
 190
 191 static void copy_buffer( const GLubyte * buffer) {
 192  int size = SVGABuffer.BufferSize, page = 0;
 193
 194 #ifdef SVGA_DEBUG
 195    sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
 196    SVGAlog(cbuf);
 197 #endif
 198
 199  while(size>0) {
 200  vga_setpage(page++);
 201   if (size>>16) {
 202    memcpy(SVGABuffer.VideoRam,buffer,0x10000);
 203    buffer+=0x10000;
 204   }else{
 205    memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
 206   }
 207   size-=0xffff;
 208  }
 209 }
 210
 211 static void get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
 212 {
 213    *width = SVGAMesa->width = vga_getxdim();
 214    *height = SVGAMesa->height = vga_getydim();
 215 }
 216
 217 static GLboolean set_draw_buffer( GLcontext *ctx, GLenum buffer )
 218 {
 219    if (buffer == GL_FRONT_LEFT) {
 220       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 221 #if 0
 222       /*    vga_waitretrace(); */
 223       void * tmpptr;
 224       copy_buffer(SVGABuffer.FrontBuffer);
 225       tmpptr=SVGABuffer.BackBuffer;
 226       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 227       SVGABuffer.FrontBuffer=tmpptr;
 228 #endif
 229       return GL_TRUE;
 230    }
 231    else if (buffer == GL_BACK_LEFT) {
 232       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 233 #if 0
 234       /*    vga_waitretrace(); */
 235       copy_buffer(SVGABuffer.BackBuffer);
 236 #endif
 237       return GL_TRUE;
 238    }
 239    else
 240       return GL_FALSE;
 241 }
 242
 243
 244 static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 245                              GLenum buffer )
 246 {
 247    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 248     * function.
 249     */
 250    (void) colorBuffer;
 251
 252    if (buffer == GL_FRONT_LEFT) {
 253       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 254 #if 0
 255       void * tmpptr;
 256       /*    vga_waitretrace(); */
 257       copy_buffer(SVGABuffer.FrontBuffer);
 258       tmpptr=SVGABuffer.BackBuffer;
 259       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 260       SVGABuffer.FrontBuffer=tmpptr;
 261 #endif
 262    }
 263    else if (buffer == GL_BACK_LEFT) {
 264       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 265 #if 0
 266       /*    vga_waitretrace(); */
 267       copy_buffer(SVGABuffer.BackBuffer);
 268 #endif
 269    }
 270 }
 271
 272 /**********************************************************************/
 273 /*****                                                            *****/
 274 /**********************************************************************/
 275
 276 static void svgamesa_update_state( GLcontext *ctx )
 277 {
 278    /* Initialize all the pointers in the DD struct.  Do this whenever */
 279    /* a new context is made current or we change buffers via set_buffer! */
 280
 281    ctx->Driver.UpdateState = svgamesa_update_state;
 282
 283    ctx->Driver.GetBufferSize = get_buffer_size;
 284    ctx->Driver.SetDrawBuffer = set_draw_buffer;
 285    ctx->Driver.SetReadBuffer = set_read_buffer;
 286
 287    ctx->Driver.PointsFunc = NULL;
 288    ctx->Driver.LineFunc = NULL;
 289    ctx->Driver.TriangleFunc = NULL;
 290
 291    switch (SVGABuffer.Depth) {
 292     case  8: ctx->Driver.ClearIndex = __clear_index8;
 293              ctx->Driver.Clear      = __clear8;
 294
 295              ctx->Driver.ReadCI32Span         = __read_ci32_span8;
 296              ctx->Driver.ReadCI32Pixels       = __read_ci32_pixels8;
 297              ctx->Driver.WriteCI8Span         = __write_ci8_span8;
 298              ctx->Driver.WriteCI32Span        = __write_ci32_span8;
 299              ctx->Driver.WriteCI32Pixels      = __write_ci32_pixels8;
 300              ctx->Driver.WriteMonoCISpan      = __write_mono_ci_span8;
 301              ctx->Driver.WriteMonoCIPixels    = __write_mono_ci_pixels8;
 302 #ifdef SVGA_DEBUG
 303     SVGAlog("SVGAUpdateState: 8 bit mode.");
 304 #endif
 305
 306              break;
 307     case 15: ctx->Driver.ClearColor = __clear_color15;
 308              ctx->Driver.Clear      = __clear15;
 309
 310              ctx->Driver.ReadRGBASpan         = __read_rgba_span15;
 311              ctx->Driver.ReadRGBAPixels       = __read_rgba_pixels15;
 312              ctx->Driver.WriteRGBASpan        = __write_rgba_span15;
 313              ctx->Driver.WriteRGBAPixels      = __write_rgba_pixels15;
 314              ctx->Driver.WriteMonoRGBASpan    = __write_mono_rgba_span15;
 315              ctx->Driver.WriteMonoRGBAPixels  = __write_mono_rgba_pixels15;
 316 #ifdef SVGA_DEBUG
 317     SVGAlog("SVGAUpdateState: 15 bit mode.");
 318 #endif
 319              break;
 320     case 16: ctx->Driver.ClearColor = __clear_color16;
 321              ctx->Driver.Clear      = __clear16;
 322
 323              ctx->Driver.ReadRGBASpan         = __read_rgba_span16;
 324              ctx->Driver.ReadRGBAPixels       = __read_rgba_pixels16;
 325              ctx->Driver.WriteRGBASpan        = __write_rgba_span16;
 326              ctx->Driver.WriteRGBAPixels      = __write_rgba_pixels16;
 327              ctx->Driver.WriteMonoRGBASpan    = __write_mono_rgba_span16;
 328              ctx->Driver.WriteMonoRGBAPixels  = __write_mono_rgba_pixels16;
 329              break;
 330 #ifdef SVGA_DEBUG
 331     SVGAlog("SVGAUpdateState: 16 bit mode.");
 332 #endif
 333     case 24: ctx->Driver.ClearColor = __clear_color24;
 334              ctx->Driver.Clear      = __clear24;
 335
 336              ctx->Driver.ReadRGBASpan         = __read_rgba_span24;
 337              ctx->Driver.ReadRGBAPixels       = __read_rgba_pixels24;
 338              ctx->Driver.WriteRGBASpan        = __write_rgba_span24;
 339              ctx->Driver.WriteRGBAPixels      = __write_rgba_pixels24;
 340              ctx->Driver.WriteMonoRGBASpan    = __write_mono_rgba_span24;
 341              ctx->Driver.WriteMonoRGBAPixels  = __write_mono_rgba_pixels24;
 342              break;
 343 #ifdef SVGA_DEBUG
 344     SVGAlog("SVGAUpdateState: 32 bit mode.");
 345 #endif
 346     case 32: ctx->Driver.ClearColor = __clear_color32;
 347              ctx->Driver.Clear      = __clear32;
 348
 349              ctx->Driver.ReadRGBASpan         = __read_rgba_span32;
 350              ctx->Driver.ReadRGBAPixels       = __read_rgba_pixels32;
 351              ctx->Driver.WriteRGBASpan        = __write_rgba_span32;
 352              ctx->Driver.WriteRGBAPixels      = __write_rgba_pixels32;
 353              ctx->Driver.WriteMonoRGBASpan    = __write_mono_rgba_span32;
 354              ctx->Driver.WriteMonoRGBAPixels  = __write_mono_rgba_pixels32;
 355    }
 356 }
 357
 358 /*
 359  * Create a new VGA/Mesa context and return a handle to it.
 360  */
 361 SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
 362 {
 363    SVGAMesaContext ctx;
 364 #ifndef DEV
 365    GLboolean rgb_flag;
 366    GLfloat redscale, greenscale, bluescale, alphascale;
 367    GLint index_bits;
 368    GLint redbits, greenbits, bluebits, alphabits;
 369    /* determine if we're in RGB or color index mode */
 370    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 371       rgb_flag = GL_TRUE;
 372       redscale = greenscale = bluescale = alphascale = 255.0;
 373       redbits = greenbits = bluebits = 8;
 374       alphabits = 0;
 375       index_bits = 0;
 376    }
 377    else if (SVGABuffer.Depth==8) {
 378       rgb_flag = GL_FALSE;
 379       redscale = greenscale = bluescale = alphascale = 0.0;
 380       redbits = greenbits = bluebits = alphabits = 0;
 381       index_bits = 8;
 382    }
 383    else if (SVGABuffer.Depth==15) {
 384       rgb_flag = GL_TRUE;
 385       redscale = greenscale = bluescale = alphascale = 31.0;
 386       redbits = greenbits = bluebits = 5;
 387       alphabits = 0;
 388       index_bits = 0;
 389    }
 390    else if (SVGABuffer.Depth==16) {
 391       rgb_flag = GL_TRUE;
 392       redscale = bluescale = alphascale = 31.0;
 393       greenscale = 63.0;
 394       redbits = bluebits = 5;
 395       greenbits = 6;
 396       alphabits = 0;
 397       index_bits = 0;
 398    }
 399
 400    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 401    if (!ctx) {
 402       return NULL;
 403    }
 404
 405    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 406                                       doubleBuffer,
 407                                       GL_FALSE,  /* stereo */
 408                                       redbits, greenbits,
 409                                       bluebits, alphabits,
 410                                       index_bits,
 411                                       16,   /* depth_size */
 412                                       8,    /* stencil_size */
 413                                       16, 16, 16, 16,   /* accum_size */
 414                                       1     /* samples */
 415                                       );
 416
 417    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 418                                        NULL,  /* share list context */
 419                                        (void *) ctx, GL_TRUE );
 420
 421    ctx->gl_buffer = _mesa_create_framebuffer( ctx->gl_vis,
 422                                               ctx->gl_vis->DepthBits > 0,
 423                                               ctx->gl_vis->StencilBits > 0,
 424                                               ctx->gl_vis->AccumRedBits > 0,
 425                                               ctx->gl_vis->AlphaBits > 0 );
 426
 427    ctx->width = ctx->height = 0;  /* temporary until first "make-current" */
 428 #endif
 429    return ctx;
 430 }
 431
 432 /*
 433  * Destroy the given VGA/Mesa context.
 434  */
 435 void SVGAMesaDestroyContext( SVGAMesaContext ctx )
 436 {
 437 #ifndef DEV
 438    if (ctx) {
 439       _mesa_destroy_visual( ctx->gl_vis );
 440       _mesa_destroy_context( ctx->gl_ctx );
 441       _mesa_destroy_framebuffer( ctx->gl_buffer );
 442       free( ctx );
 443       if (ctx==SVGAMesa) {
 444          SVGAMesa = NULL;
 445       }
 446    }
 447 #endif
 448 }
 449
 450 /*
 451  * Make the specified VGA/Mesa context the current one.
 452  */
 453 void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
 454 {
 455 #ifndef DEV
 456    SVGAMesa = ctx;
 457    svgamesa_update_state( ctx->gl_ctx );
 458    _mesa_make_current( ctx->gl_ctx, ctx->gl_buffer );
 459
 460    if (ctx->width==0 || ctx->height==0) {
 461       /* setup initial viewport */
 462       ctx->width = vga_getxdim();
 463       ctx->height = vga_getydim();
 464       gl_Viewport( ctx->gl_ctx, 0, 0, ctx->width, ctx->height );
 465    }
 466 #endif
 467 }
 468
 469 /*
 470  * Return a handle to the current VGA/Mesa context.
 471  */
 472 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 473 {
 474    return SVGAMesa;
 475 }
 476
 477 /*
 478  * Swap front/back buffers for current context if double buffered.
 479  */
 480 void SVGAMesaSwapBuffers( void )
 481 {
 482 #if 000
 483    void * tmpptr;
 484 #endif
 485
 486    /* vga_waitretrace(); */
 487    copy_buffer(SVGABuffer.BackBuffer);
 488
 489 #ifndef DEV
 490    FLUSH_VB( SVGAMesa->gl_ctx, "swap buffers" );
 491    if (SVGAMesa->gl_vis->DBflag)
 492 #endif /* DEV */
 493    {
 494 #ifdef SVGA_DEBUG
 495       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 496       SVGAlog(cbuf);
 497 #endif /* SVGA_DEBUG */
 498 #if 000
 499       tmpptr=SVGABuffer.BackBuffer;
 500       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 501       SVGABuffer.FrontBuffer=tmpptr;
 502 #endif
 503 #ifdef SVGA_DEBUG
 504       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 505               "                      Readbuffer  : %p", \
 506               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 507       SVGAlog(cbuf);
 508 #endif /* SVGA_DEBUG */
 509    }
 510 }
 511
 512 #else /*SVGA*/
 513
 514 /*
 515  * Need this to provide at least one external definition when SVGA is
 516  * not defined on the compiler command line.
 517  */
 518
 519 int gl_svga_dummy_function(void)
 520 {
 521    return 0;
 522 }
 523
 524 #endif  /*SVGA*/
 525