src/mesa/drivers/svga/svgamesa.c

   1 /* $Id: svgamesa.c,v 1.20 2002/07/09 01:22:51 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 <string.h>
  43 #include <vga.h>
  44 #include "GL/svgamesa.h"
  45 #include "context.h"
  46 #include "extensions.h"
  47 #include "imports.h"
  48 #include "matrix.h"
  49 #include "mtypes.h"
  50 #include "swrast/swrast.h"
  51 #endif
  52
  53 #include "svgapix.h"
  54 #include "svgamesa8.h"
  55 #include "svgamesa15.h"
  56 #include "svgamesa16.h"
  57 #include "svgamesa24.h"
  58 #include "svgamesa32.h"
  59
  60 struct svga_buffer SVGABuffer;
  61 vga_modeinfo * SVGAInfo;
  62 SVGAMesaContext SVGAMesa;    /* the current context */
  63
  64 #ifdef SVGA_DEBUG
  65
  66 #include <sys/types.h>
  67 #include <signal.h>
  68
  69 FILE * logfile;
  70 char cbuf[1024]={0};
  71
  72 void SVGAlog(char * what)
  73 {
  74  logfile=fopen("svgamesa.log","a");
  75  if (!logfile) return;
  76  fprintf(logfile,"%s\n",what);
  77  fclose(logfile);
  78 }
  79 #endif
  80
  81 /**********************************************************************/
  82 /*****                       Init stuff...                        *****/
  83 /**********************************************************************/
  84
  85 int SVGAMesaInit( int GraphMode )
  86 {
  87    vga_init();
  88    if (!vga_hasmode(GraphMode))
  89    {
  90     fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
  91 #ifdef SVGA_DEBUG
  92     SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
  93 #endif
  94     return(1);
  95    }
  96    SVGAInfo=vga_getmodeinfo(GraphMode);
  97    if (SVGAInfo->flags & IS_MODEX)
  98    {
  99     fprintf(stderr,"ModeX not implemented...");
 100 #ifdef SVGA_DEBUG
 101     SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
 102 #endif
 103     return(2);
 104    }
 105    if (!SVGAInfo->bytesperpixel)
 106    {
 107     fprintf(stderr,"1 / 4 bit color not implemented...");
 108 #ifdef SVGA_DEBUG
 109     SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
 110 #endif
 111     return(3);
 112    }
 113    switch (SVGAInfo->colors) {
 114     case   256: SVGABuffer.Depth = 8;  break;
 115     case 32768: SVGABuffer.Depth = 15; break;
 116     case 65536: SVGABuffer.Depth = 16; break;
 117     default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
 118    }
 119    SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
 120 #ifdef SVGA_DEBUG
 121    sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
 122                  "              depth  : %d\n" \
 123                  "              mode   : %d\n" \
 124                  "              width  : %d\n" \
 125                  "              height : %d\n" \
 126                  "              bufsize: %d\n", \
 127                  SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
 128                  SVGAInfo->height,SVGABuffer.BufferSize);
 129    SVGAlog(cbuf);
 130 #endif
 131    SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 132    if (!SVGABuffer.FrontBuffer) {
 133     {
 134      fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
 135 #ifdef SVGA_DEBUG
 136      SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
 137 #endif
 138      return(4);
 139     }
 140    }
 141 #ifdef SVGA_DEBUG
 142    sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
 143    SVGAlog(cbuf);
 144 #endif
 145    SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 146    if (!SVGABuffer.BackBuffer) {
 147     {
 148      free(SVGABuffer.FrontBuffer);
 149      fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
 150 #ifdef SVGA_DEBUG
 151      SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
 152 #endif
 153      return(5);
 154     }
 155    }
 156 #ifdef SVGA_DEBUG
 157    sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
 158    SVGAlog(cbuf);
 159 #endif
 160
 161    vga_setmode(GraphMode);
 162    SVGABuffer.VideoRam=vga_getgraphmem();
 163 #ifdef SVGA_DEBUG
 164    sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
 165    SVGAlog(cbuf);
 166    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
 167    SVGAlog(cbuf);
 168 #endif
 169
 170    SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 171    SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 172
 173    return 0;
 174 }
 175
 176 int SVGAMesaClose( void )
 177 {
 178    vga_setmode(TEXT);
 179    free(SVGABuffer.FrontBuffer);
 180    free(SVGABuffer.BackBuffer);
 181    return 0;
 182 }
 183
 184 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 185 {
 186    if (ndx<256)
 187       vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 188 }
 189
 190 /**********************************************************************/
 191 /*****                 Miscellaneous functions                    *****/
 192 /**********************************************************************/
 193
 194 static void copy_buffer( const GLubyte * buffer) {
 195  int size = SVGABuffer.BufferSize, page = 0;
 196
 197 #ifdef SVGA_DEBUG
 198    sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
 199    SVGAlog(cbuf);
 200 #endif
 201
 202  while(size>0) {
 203  vga_setpage(page++);
 204   if (size>>16) {
 205    memcpy(SVGABuffer.VideoRam,buffer,0x10000);
 206    buffer+=0x10000;
 207   }else{
 208    memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
 209   }
 210   size-=0xffff;
 211  }
 212 }
 213
 214 static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 215 {
 216    *width = SVGAMesa->width = vga_getxdim();
 217    *height = SVGAMesa->height = vga_getydim();
 218 }
 219
 220
 221 static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 222                         GLenum buffer )
 223 {
 224    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 225     * function.
 226     */
 227    (void) colorBuffer;
 228
 229    if (buffer == GL_FRONT_LEFT) {
 230       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 231       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 232 #if 0
 233       void * tmpptr;
 234       /*    vga_waitretrace(); */
 235       copy_buffer(SVGABuffer.FrontBuffer);
 236       tmpptr=SVGABuffer.BackBuffer;
 237       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 238       SVGABuffer.FrontBuffer=tmpptr;
 239 #endif
 240    }
 241    else if (buffer == GL_BACK_LEFT) {
 242       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 243       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 244 #if 0
 245       /*    vga_waitretrace(); */
 246       copy_buffer(SVGABuffer.BackBuffer);
 247 #endif
 248    }
 249 }
 250
 251 /**********************************************************************/
 252 /*****                                                            *****/
 253 /**********************************************************************/
 254
 255 static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 256 {
 257    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
 258
 259    /* Initialize all the pointers in the DD struct.  Do this whenever */
 260    /* a new context is made current or we change buffers via set_buffer! */
 261
 262    ctx->Driver.UpdateState = svgamesa_update_state;
 263
 264    ctx->Driver.GetBufferSize = get_buffer_size;
 265    ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
 266
 267    /* Software rasterizer pixel paths:
 268     */
 269    ctx->Driver.Accum = _swrast_Accum;
 270    ctx->Driver.Bitmap = _swrast_Bitmap;
 271    ctx->Driver.CopyPixels = _swrast_CopyPixels;
 272    ctx->Driver.DrawPixels = _swrast_DrawPixels;
 273    ctx->Driver.ReadPixels = _swrast_ReadPixels;
 274    ctx->Driver.DrawBuffer = _swrast_DrawBuffer;
 275
 276    /* Fill in the swrast driver interface:
 277     */
 278    swdd->SetBuffer = set_buffer;
 279
 280    switch (SVGABuffer.Depth) {
 281     case  8: ctx->Driver.ClearIndex = __clear_index8;
 282              ctx->Driver.Clear      = __clear8;
 283
 284              swdd->ReadCI32Span         = __read_ci32_span8;
 285              swdd->ReadCI32Pixels       = __read_ci32_pixels8;
 286              swdd->WriteCI8Span         = __write_ci8_span8;
 287              swdd->WriteCI32Span        = __write_ci32_span8;
 288              swdd->WriteCI32Pixels      = __write_ci32_pixels8;
 289              swdd->WriteMonoCISpan      = __write_mono_ci_span8;
 290              swdd->WriteMonoCIPixels    = __write_mono_ci_pixels8;
 291 #ifdef SVGA_DEBUG
 292     SVGAlog("SVGAUpdateState: 8 bit mode.");
 293 #endif
 294
 295              break;
 296     case 15: ctx->Driver.ClearColor = __clear_color15;
 297              ctx->Driver.Clear      = __clear15;
 298
 299              swdd->ReadRGBASpan         = __read_rgba_span15;
 300              swdd->ReadRGBAPixels       = __read_rgba_pixels15;
 301              swdd->WriteRGBASpan        = __write_rgba_span15;
 302              swdd->WriteRGBAPixels      = __write_rgba_pixels15;
 303              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span15;
 304              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels15;
 305 #ifdef SVGA_DEBUG
 306     SVGAlog("SVGAUpdateState: 15 bit mode.");
 307 #endif
 308              break;
 309     case 16: ctx->Driver.ClearColor = __clear_color16;
 310              ctx->Driver.Clear      = __clear16;
 311
 312              swdd->ReadRGBASpan         = __read_rgba_span16;
 313              swdd->ReadRGBAPixels       = __read_rgba_pixels16;
 314              swdd->WriteRGBASpan        = __write_rgba_span16;
 315              swdd->WriteRGBAPixels      = __write_rgba_pixels16;
 316              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span16;
 317              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels16;
 318              break;
 319 #ifdef SVGA_DEBUG
 320     SVGAlog("SVGAUpdateState: 16 bit mode.");
 321 #endif
 322     case 24: ctx->Driver.ClearColor = __clear_color24;
 323              ctx->Driver.Clear      = __clear24;
 324
 325              swdd->ReadRGBASpan         = __read_rgba_span24;
 326              swdd->ReadRGBAPixels       = __read_rgba_pixels24;
 327              swdd->WriteRGBASpan        = __write_rgba_span24;
 328              swdd->WriteRGBAPixels      = __write_rgba_pixels24;
 329              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span24;
 330              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels24;
 331              break;
 332 #ifdef SVGA_DEBUG
 333     SVGAlog("SVGAUpdateState: 32 bit mode.");
 334 #endif
 335     case 32: ctx->Driver.ClearColor = __clear_color32;
 336              ctx->Driver.Clear      = __clear32;
 337
 338              swdd->ReadRGBASpan         = __read_rgba_span32;
 339              swdd->ReadRGBAPixels       = __read_rgba_pixels32;
 340              swdd->WriteRGBASpan        = __write_rgba_span32;
 341              swdd->WriteRGBAPixels      = __write_rgba_pixels32;
 342              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span32;
 343              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels32;
 344    }
 345 }
 346
 347 /*
 348  * Create a new VGA/Mesa context and return a handle to it.
 349  */
 350 SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
 351 {
 352    SVGAMesaContext ctx;
 353 #ifndef DEV
 354    GLboolean rgb_flag;
 355    GLfloat redscale, greenscale, bluescale, alphascale;
 356    GLint index_bits;
 357    GLint redbits, greenbits, bluebits, alphabits;
 358    __GLimports imports;
 359
 360    /* determine if we're in RGB or color index mode */
 361    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 362       rgb_flag = GL_TRUE;
 363       redscale = greenscale = bluescale = alphascale = 255.0;
 364       redbits = greenbits = bluebits = 8;
 365       alphabits = 0;
 366       index_bits = 0;
 367    }
 368    else if (SVGABuffer.Depth==8) {
 369       rgb_flag = GL_FALSE;
 370       redscale = greenscale = bluescale = alphascale = 0.0;
 371       redbits = greenbits = bluebits = alphabits = 0;
 372       index_bits = 8;
 373    }
 374    else if (SVGABuffer.Depth==15) {
 375       rgb_flag = GL_TRUE;
 376       redscale = greenscale = bluescale = alphascale = 31.0;
 377       redbits = greenbits = bluebits = 5;
 378       alphabits = 0;
 379       index_bits = 0;
 380    }
 381    else if (SVGABuffer.Depth==16) {
 382       rgb_flag = GL_TRUE;
 383       redscale = bluescale = alphascale = 31.0;
 384       greenscale = 63.0;
 385       redbits = bluebits = 5;
 386       greenbits = 6;
 387       alphabits = 0;
 388       index_bits = 0;
 389    }
 390
 391    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 392    if (!ctx) {
 393       return NULL;
 394    }
 395
 396    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 397                                       doubleBuffer,
 398                                       GL_FALSE,  /* stereo */
 399                                       redbits, greenbits,
 400                                       bluebits, alphabits,
 401                                       index_bits,
 402                                       16,   /* depth_size */
 403                                       8,    /* stencil_size */
 404                                       16, 16, 16, 16,   /* accum_size */
 405                                       1     /* samples */
 406                                       );
 407
 408    _mesa_init_default_imports( &imports, (void *) ctx);
 409    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 410                                        NULL,  /* share list context */
 411                                        &imports );
 412
 413    _mesa_enable_sw_extensions(ctx->gl_ctx);
 414    _mesa_enable_1_3_extensions(ctx->gl_ctx);
 415
 416    ctx->gl_buffer = _mesa_create_framebuffer( ctx->gl_vis,
 417                                               ctx->gl_vis->depthBits > 0,
 418                                               ctx->gl_vis->stencilBits > 0,
 419                                               ctx->gl_vis->accumRedBits > 0,
 420                                               ctx->gl_vis->alphaBits > 0 );
 421
 422    ctx->width = ctx->height = 0;  /* temporary until first "make-current" */
 423 #endif
 424    return ctx;
 425 }
 426
 427 /*
 428  * Destroy the given VGA/Mesa context.
 429  */
 430 void SVGAMesaDestroyContext( SVGAMesaContext ctx )
 431 {
 432 #ifndef DEV
 433    if (ctx) {
 434       _mesa_destroy_visual( ctx->gl_vis );
 435       _mesa_destroy_context( ctx->gl_ctx );
 436       _mesa_destroy_framebuffer( ctx->gl_buffer );
 437       free( ctx );
 438       if (ctx==SVGAMesa) {
 439          SVGAMesa = NULL;
 440       }
 441    }
 442 #endif
 443 }
 444
 445 /*
 446  * Make the specified VGA/Mesa context the current one.
 447  */
 448 void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
 449 {
 450 #ifndef DEV
 451    SVGAMesa = ctx;
 452    svgamesa_update_state( ctx->gl_ctx, ~0 );
 453    _mesa_make_current( ctx->gl_ctx, ctx->gl_buffer );
 454
 455    if (ctx->width==0 || ctx->height==0) {
 456       /* setup initial viewport */
 457       ctx->width = vga_getxdim();
 458       ctx->height = vga_getydim();
 459       _mesa_set_viewport( ctx->gl_ctx, 0, 0, ctx->width, ctx->height );
 460    }
 461 #endif
 462 }
 463
 464 /*
 465  * Return a handle to the current VGA/Mesa context.
 466  */
 467 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 468 {
 469    return SVGAMesa;
 470 }
 471
 472 /*
 473  * Swap front/back buffers for current context if double buffered.
 474  */
 475 void SVGAMesaSwapBuffers( void )
 476 {
 477 #if 000
 478    void * tmpptr;
 479 #endif
 480
 481    /* vga_waitretrace(); */
 482    copy_buffer(SVGABuffer.BackBuffer);
 483
 484 #ifndef DEV
 485    _mesa_swapbuffers( SVGAMesa->gl_ctx );
 486    if (SVGAMesa->gl_vis->doubleBufferMode)
 487 #endif /* DEV */
 488    {
 489 #ifdef SVGA_DEBUG
 490       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 491       SVGAlog(cbuf);
 492 #endif /* SVGA_DEBUG */
 493 #if 000
 494       tmpptr=SVGABuffer.BackBuffer;
 495       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 496       SVGABuffer.FrontBuffer=tmpptr;
 497 #endif
 498 #ifdef SVGA_DEBUG
 499       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 500               "                      Readbuffer  : %p", \
 501               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 502       SVGAlog(cbuf);
 503 #endif /* SVGA_DEBUG */
 504    }
 505 }
 506
 507 #else /*SVGA*/
 508
 509 /*
 510  * Need this to provide at least one external definition when SVGA is
 511  * not defined on the compiler command line.
 512  */
 513
 514 int gl_svga_dummy_function(void)
 515 {
 516    return 0;
 517 }
 518
 519 #endif  /*SVGA*/
 520