src/mesa/drivers/svga/svgamesa.c

   1 /* $Id: svgamesa.c,v 1.15 2001/03/19 02:25:36 keithw 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 "matrix.h"
  48 #include "mtypes.h"
  49 #include "swrast/swrast.h"
  50 #endif
  51
  52 #include "svgapix.h"
  53 #include "svgamesa8.h"
  54 #include "svgamesa15.h"
  55 #include "svgamesa16.h"
  56 #include "svgamesa24.h"
  57 #include "svgamesa32.h"
  58
  59 struct svga_buffer SVGABuffer;
  60 vga_modeinfo * SVGAInfo;
  61 SVGAMesaContext SVGAMesa;    /* the current context */
  62
  63 #ifdef SVGA_DEBUG
  64
  65 #include <sys/types.h>
  66 #include <signal.h>
  67
  68 FILE * logfile;
  69 char cbuf[1024]={0};
  70
  71 void SVGAlog(char * what)
  72 {
  73  logfile=fopen("svgamesa.log","a");
  74  if (!logfile) return;
  75  fprintf(logfile,"%s\n",what);
  76  fclose(logfile);
  77 }
  78 #endif
  79
  80 /**********************************************************************/
  81 /*****                       Init stuff...                        *****/
  82 /**********************************************************************/
  83
  84 int SVGAMesaInit( int GraphMode )
  85 {
  86    vga_init();
  87    if (!vga_hasmode(GraphMode))
  88    {
  89     fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
  90 #ifdef SVGA_DEBUG
  91     SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
  92 #endif
  93     return(1);
  94    }
  95    SVGAInfo=vga_getmodeinfo(GraphMode);
  96    if (SVGAInfo->flags & IS_MODEX)
  97    {
  98     fprintf(stderr,"ModeX not implemented...");
  99 #ifdef SVGA_DEBUG
 100     SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
 101 #endif
 102     return(2);
 103    }
 104    if (!SVGAInfo->bytesperpixel)
 105    {
 106     fprintf(stderr,"1 / 4 bit color not implemented...");
 107 #ifdef SVGA_DEBUG
 108     SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
 109 #endif
 110     return(3);
 111    }
 112    switch (SVGAInfo->colors) {
 113     case   256: SVGABuffer.Depth = 8;  break;
 114     case 32768: SVGABuffer.Depth = 15; break;
 115     case 65536: SVGABuffer.Depth = 16; break;
 116     default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
 117    }
 118    SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
 119 #ifdef SVGA_DEBUG
 120    sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
 121                  "              depth  : %d\n" \
 122                  "              mode   : %d\n" \
 123                  "              width  : %d\n" \
 124                  "              height : %d\n" \
 125                  "              bufsize: %d\n", \
 126                  SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
 127                  SVGAInfo->height,SVGABuffer.BufferSize);
 128    SVGAlog(cbuf);
 129 #endif
 130    SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 131    if (!SVGABuffer.FrontBuffer) {
 132     {
 133      fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
 134 #ifdef SVGA_DEBUG
 135      SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
 136 #endif
 137      return(4);
 138     }
 139    }
 140 #ifdef SVGA_DEBUG
 141    sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
 142    SVGAlog(cbuf);
 143 #endif
 144    SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 145    if (!SVGABuffer.BackBuffer) {
 146     {
 147      free(SVGABuffer.FrontBuffer);
 148      fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
 149 #ifdef SVGA_DEBUG
 150      SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
 151 #endif
 152      return(5);
 153     }
 154    }
 155 #ifdef SVGA_DEBUG
 156    sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
 157    SVGAlog(cbuf);
 158 #endif
 159
 160    vga_setmode(GraphMode);
 161    SVGABuffer.VideoRam=vga_getgraphmem();
 162 #ifdef SVGA_DEBUG
 163    sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
 164    SVGAlog(cbuf);
 165    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
 166    SVGAlog(cbuf);
 167 #endif
 168
 169    SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 170    SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 171
 172    return 0;
 173 }
 174
 175 int SVGAMesaClose( void )
 176 {
 177    vga_setmode(TEXT);
 178    free(SVGABuffer.FrontBuffer);
 179    free(SVGABuffer.BackBuffer);
 180    return 0;
 181 }
 182
 183 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 184 {
 185    if (ndx<256)
 186       vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 187 }
 188
 189 /**********************************************************************/
 190 /*****                 Miscellaneous functions                    *****/
 191 /**********************************************************************/
 192
 193 static void copy_buffer( const GLubyte * buffer) {
 194  int size = SVGABuffer.BufferSize, page = 0;
 195
 196 #ifdef SVGA_DEBUG
 197    sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
 198    SVGAlog(cbuf);
 199 #endif
 200
 201  while(size>0) {
 202  vga_setpage(page++);
 203   if (size>>16) {
 204    memcpy(SVGABuffer.VideoRam,buffer,0x10000);
 205    buffer+=0x10000;
 206   }else{
 207    memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
 208   }
 209   size-=0xffff;
 210  }
 211 }
 212
 213 static void get_buffer_size( GLcontext *ctx, GLuint *width, GLuint *height )
 214 {
 215    *width = SVGAMesa->width = vga_getxdim();
 216    *height = SVGAMesa->height = vga_getydim();
 217 }
 218
 219 static GLboolean set_draw_buffer( GLcontext *ctx, GLenum buffer )
 220 {
 221    if (buffer == GL_FRONT_LEFT) {
 222       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 223 #if 0
 224       /*    vga_waitretrace(); */
 225       void * tmpptr;
 226       copy_buffer(SVGABuffer.FrontBuffer);
 227       tmpptr=SVGABuffer.BackBuffer;
 228       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 229       SVGABuffer.FrontBuffer=tmpptr;
 230 #endif
 231       return GL_TRUE;
 232    }
 233    else if (buffer == GL_BACK_LEFT) {
 234       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 235 #if 0
 236       /*    vga_waitretrace(); */
 237       copy_buffer(SVGABuffer.BackBuffer);
 238 #endif
 239       return GL_TRUE;
 240    }
 241    else
 242       return GL_FALSE;
 243 }
 244
 245
 246 static void set_read_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 247                              GLenum buffer )
 248 {
 249    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 250     * function.
 251     */
 252    (void) colorBuffer;
 253
 254    if (buffer == GL_FRONT_LEFT) {
 255       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 256 #if 0
 257       void * tmpptr;
 258       /*    vga_waitretrace(); */
 259       copy_buffer(SVGABuffer.FrontBuffer);
 260       tmpptr=SVGABuffer.BackBuffer;
 261       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 262       SVGABuffer.FrontBuffer=tmpptr;
 263 #endif
 264    }
 265    else if (buffer == GL_BACK_LEFT) {
 266       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 267 #if 0
 268       /*    vga_waitretrace(); */
 269       copy_buffer(SVGABuffer.BackBuffer);
 270 #endif
 271    }
 272 }
 273
 274 /**********************************************************************/
 275 /*****                                                            *****/
 276 /**********************************************************************/
 277
 278 static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 279 {
 280    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
 281
 282    /* Initialize all the pointers in the DD struct.  Do this whenever */
 283    /* a new context is made current or we change buffers via set_buffer! */
 284
 285    ctx->Driver.UpdateState = svgamesa_update_state;
 286
 287    ctx->Driver.GetBufferSize = get_buffer_size;
 288    ctx->Driver.SetDrawBuffer = set_draw_buffer;
 289
 290    /* Software rasterizer pixel paths:
 291     */
 292    ctx->Driver.Accum = _swrast_Accum;
 293    ctx->Driver.Bitmap = _swrast_Bitmap;
 294    ctx->Driver.CopyPixels = _swrast_CopyPixels;
 295    ctx->Driver.DrawPixels = _swrast_DrawPixels;
 296    ctx->Driver.ReadPixels = _swrast_ReadPixels;
 297
 298    /* Fill in the swrast driver interface:
 299     */
 300    swdd->SetReadBuffer = set_read_buffer;
 301
 302    switch (SVGABuffer.Depth) {
 303     case  8: ctx->Driver.ClearIndex = __clear_index8;
 304              ctx->Driver.Clear      = __clear8;
 305
 306              swdd->ReadCI32Span         = __read_ci32_span8;
 307              swdd->ReadCI32Pixels       = __read_ci32_pixels8;
 308              swdd->WriteCI8Span         = __write_ci8_span8;
 309              swdd->WriteCI32Span        = __write_ci32_span8;
 310              swdd->WriteCI32Pixels      = __write_ci32_pixels8;
 311              swdd->WriteMonoCISpan      = __write_mono_ci_span8;
 312              swdd->WriteMonoCIPixels    = __write_mono_ci_pixels8;
 313 #ifdef SVGA_DEBUG
 314     SVGAlog("SVGAUpdateState: 8 bit mode.");
 315 #endif
 316
 317              break;
 318     case 15: ctx->Driver.ClearColor = __clear_color15;
 319              ctx->Driver.Clear      = __clear15;
 320
 321              swdd->ReadRGBASpan         = __read_rgba_span15;
 322              swdd->ReadRGBAPixels       = __read_rgba_pixels15;
 323              swdd->WriteRGBASpan        = __write_rgba_span15;
 324              swdd->WriteRGBAPixels      = __write_rgba_pixels15;
 325              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span15;
 326              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels15;
 327 #ifdef SVGA_DEBUG
 328     SVGAlog("SVGAUpdateState: 15 bit mode.");
 329 #endif
 330              break;
 331     case 16: ctx->Driver.ClearColor = __clear_color16;
 332              ctx->Driver.Clear      = __clear16;
 333
 334              swdd->ReadRGBASpan         = __read_rgba_span16;
 335              swdd->ReadRGBAPixels       = __read_rgba_pixels16;
 336              swdd->WriteRGBASpan        = __write_rgba_span16;
 337              swdd->WriteRGBAPixels      = __write_rgba_pixels16;
 338              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span16;
 339              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels16;
 340              break;
 341 #ifdef SVGA_DEBUG
 342     SVGAlog("SVGAUpdateState: 16 bit mode.");
 343 #endif
 344     case 24: ctx->Driver.ClearColor = __clear_color24;
 345              ctx->Driver.Clear      = __clear24;
 346
 347              swdd->ReadRGBASpan         = __read_rgba_span24;
 348              swdd->ReadRGBAPixels       = __read_rgba_pixels24;
 349              swdd->WriteRGBASpan        = __write_rgba_span24;
 350              swdd->WriteRGBAPixels      = __write_rgba_pixels24;
 351              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span24;
 352              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels24;
 353              break;
 354 #ifdef SVGA_DEBUG
 355     SVGAlog("SVGAUpdateState: 32 bit mode.");
 356 #endif
 357     case 32: ctx->Driver.ClearColor = __clear_color32;
 358              ctx->Driver.Clear      = __clear32;
 359
 360              swdd->ReadRGBASpan         = __read_rgba_span32;
 361              swdd->ReadRGBAPixels       = __read_rgba_pixels32;
 362              swdd->WriteRGBASpan        = __write_rgba_span32;
 363              swdd->WriteRGBAPixels      = __write_rgba_pixels32;
 364              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span32;
 365              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels32;
 366    }
 367 }
 368
 369 /*
 370  * Create a new VGA/Mesa context and return a handle to it.
 371  */
 372 SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
 373 {
 374    SVGAMesaContext ctx;
 375 #ifndef DEV
 376    GLboolean rgb_flag;
 377    GLfloat redscale, greenscale, bluescale, alphascale;
 378    GLint index_bits;
 379    GLint redbits, greenbits, bluebits, alphabits;
 380    /* determine if we're in RGB or color index mode */
 381    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 382       rgb_flag = GL_TRUE;
 383       redscale = greenscale = bluescale = alphascale = 255.0;
 384       redbits = greenbits = bluebits = 8;
 385       alphabits = 0;
 386       index_bits = 0;
 387    }
 388    else if (SVGABuffer.Depth==8) {
 389       rgb_flag = GL_FALSE;
 390       redscale = greenscale = bluescale = alphascale = 0.0;
 391       redbits = greenbits = bluebits = alphabits = 0;
 392       index_bits = 8;
 393    }
 394    else if (SVGABuffer.Depth==15) {
 395       rgb_flag = GL_TRUE;
 396       redscale = greenscale = bluescale = alphascale = 31.0;
 397       redbits = greenbits = bluebits = 5;
 398       alphabits = 0;
 399       index_bits = 0;
 400    }
 401    else if (SVGABuffer.Depth==16) {
 402       rgb_flag = GL_TRUE;
 403       redscale = bluescale = alphascale = 31.0;
 404       greenscale = 63.0;
 405       redbits = bluebits = 5;
 406       greenbits = 6;
 407       alphabits = 0;
 408       index_bits = 0;
 409    }
 410
 411    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 412    if (!ctx) {
 413       return NULL;
 414    }
 415
 416    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 417                                       doubleBuffer,
 418                                       GL_FALSE,  /* stereo */
 419                                       redbits, greenbits,
 420                                       bluebits, alphabits,
 421                                       index_bits,
 422                                       16,   /* depth_size */
 423                                       8,    /* stencil_size */
 424                                       16, 16, 16, 16,   /* accum_size */
 425                                       1     /* samples */
 426                                       );
 427
 428    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 429                                        NULL,  /* share list context */
 430                                        (void *) ctx, GL_TRUE );
 431
 432    _mesa_enable_sw_extensions(ctx->gl_ctx);
 433
 434    ctx->gl_buffer = _mesa_create_framebuffer( ctx->gl_vis,
 435                                               ctx->gl_vis->depthBits > 0,
 436                                               ctx->gl_vis->stencilBits > 0,
 437                                               ctx->gl_vis->accumRedBits > 0,
 438                                               ctx->gl_vis->alphaBits > 0 );
 439
 440    ctx->width = ctx->height = 0;  /* temporary until first "make-current" */
 441 #endif
 442    return ctx;
 443 }
 444
 445 /*
 446  * Destroy the given VGA/Mesa context.
 447  */
 448 void SVGAMesaDestroyContext( SVGAMesaContext ctx )
 449 {
 450 #ifndef DEV
 451    if (ctx) {
 452       _mesa_destroy_visual( ctx->gl_vis );
 453       _mesa_destroy_context( ctx->gl_ctx );
 454       _mesa_destroy_framebuffer( ctx->gl_buffer );
 455       free( ctx );
 456       if (ctx==SVGAMesa) {
 457          SVGAMesa = NULL;
 458       }
 459    }
 460 #endif
 461 }
 462
 463 /*
 464  * Make the specified VGA/Mesa context the current one.
 465  */
 466 void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
 467 {
 468 #ifndef DEV
 469    SVGAMesa = ctx;
 470    svgamesa_update_state( ctx->gl_ctx, ~0 );
 471    _mesa_make_current( ctx->gl_ctx, ctx->gl_buffer );
 472
 473    if (ctx->width==0 || ctx->height==0) {
 474       /* setup initial viewport */
 475       ctx->width = vga_getxdim();
 476       ctx->height = vga_getydim();
 477       _mesa_set_viewport( ctx->gl_ctx, 0, 0, ctx->width, ctx->height );
 478    }
 479 #endif
 480 }
 481
 482 /*
 483  * Return a handle to the current VGA/Mesa context.
 484  */
 485 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 486 {
 487    return SVGAMesa;
 488 }
 489
 490 /*
 491  * Swap front/back buffers for current context if double buffered.
 492  */
 493 void SVGAMesaSwapBuffers( void )
 494 {
 495 #if 000
 496    void * tmpptr;
 497 #endif
 498
 499    /* vga_waitretrace(); */
 500    copy_buffer(SVGABuffer.BackBuffer);
 501
 502 #ifndef DEV
 503    _mesa_swapbuffers( SVGAMesa->gl_ctx );
 504    if (SVGAMesa->gl_vis->doubleBufferMode)
 505 #endif /* DEV */
 506    {
 507 #ifdef SVGA_DEBUG
 508       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 509       SVGAlog(cbuf);
 510 #endif /* SVGA_DEBUG */
 511 #if 000
 512       tmpptr=SVGABuffer.BackBuffer;
 513       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 514       SVGABuffer.FrontBuffer=tmpptr;
 515 #endif
 516 #ifdef SVGA_DEBUG
 517       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 518               "                      Readbuffer  : %p", \
 519               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 520       SVGAlog(cbuf);
 521 #endif /* SVGA_DEBUG */
 522    }
 523 }
 524
 525 #else /*SVGA*/
 526
 527 /*
 528  * Need this to provide at least one external definition when SVGA is
 529  * not defined on the compiler command line.
 530  */
 531
 532 int gl_svga_dummy_function(void)
 533 {
 534    return 0;
 535 }
 536
 537 #endif  /*SVGA*/
 538