src/mesa/drivers/svga/svgamesa.c

   1 /* $Id: svgamesa.c,v 1.25 2004/11/29 17:30:21 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  5.0
   6  * Copyright (C) 1995-2002  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 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <vga.h>
  41 #include "GL/svgamesa.h"
  42 #include "buffers.h"
  43 #include "context.h"
  44 #include "extensions.h"
  45 #include "imports.h"
  46 #include "matrix.h"
  47 #include "mtypes.h"
  48 #include "swrast/swrast.h"
  49 #include "svgapix.h"
  50 #include "svgamesa8.h"
  51 #include "svgamesa15.h"
  52 #include "svgamesa16.h"
  53 #include "svgamesa24.h"
  54 #include "svgamesa32.h"
  55
  56 struct svga_buffer SVGABuffer;
  57 vga_modeinfo * SVGAInfo;
  58 SVGAMesaContext SVGAMesa;    /* the current context */
  59
  60 #ifdef SVGA_DEBUG
  61
  62 #include <sys/types.h>
  63 #include <signal.h>
  64
  65 FILE * logfile;
  66 char cbuf[1024]={0};
  67
  68 void SVGAlog(char * what)
  69 {
  70  logfile=fopen("svgamesa.log","a");
  71  if (!logfile) return;
  72  fprintf(logfile,"%s\n",what);
  73  fclose(logfile);
  74 }
  75 #endif
  76
  77 /**********************************************************************/
  78 /*****                       Init stuff...                        *****/
  79 /**********************************************************************/
  80
  81 int SVGAMesaInit( int GraphMode )
  82 {
  83    vga_init();
  84    if (!vga_hasmode(GraphMode))
  85    {
  86     fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
  87 #ifdef SVGA_DEBUG
  88     SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
  89 #endif
  90     return(1);
  91    }
  92    SVGAInfo=vga_getmodeinfo(GraphMode);
  93    if (SVGAInfo->flags & IS_MODEX)
  94    {
  95     fprintf(stderr,"ModeX not implemented...");
  96 #ifdef SVGA_DEBUG
  97     SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
  98 #endif
  99     return(2);
 100    }
 101    if (!SVGAInfo->bytesperpixel)
 102    {
 103     fprintf(stderr,"1 / 4 bit color not implemented...");
 104 #ifdef SVGA_DEBUG
 105     SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
 106 #endif
 107     return(3);
 108    }
 109    switch (SVGAInfo->colors) {
 110     case   256: SVGABuffer.Depth = 8;  break;
 111     case 32768: SVGABuffer.Depth = 15; break;
 112     case 65536: SVGABuffer.Depth = 16; break;
 113     default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
 114    }
 115    SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
 116 #ifdef SVGA_DEBUG
 117    sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
 118                  "              depth  : %d\n" \
 119                  "              mode   : %d\n" \
 120                  "              width  : %d\n" \
 121                  "              height : %d\n" \
 122                  "              bufsize: %d\n", \
 123                  SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
 124                  SVGAInfo->height,SVGABuffer.BufferSize);
 125    SVGAlog(cbuf);
 126 #endif
 127    SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 128    if (!SVGABuffer.FrontBuffer) {
 129     {
 130      fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
 131 #ifdef SVGA_DEBUG
 132      SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
 133 #endif
 134      return(4);
 135     }
 136    }
 137 #ifdef SVGA_DEBUG
 138    sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
 139    SVGAlog(cbuf);
 140 #endif
 141    SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 142    if (!SVGABuffer.BackBuffer) {
 143     {
 144      free(SVGABuffer.FrontBuffer);
 145      fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
 146 #ifdef SVGA_DEBUG
 147      SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
 148 #endif
 149      return(5);
 150     }
 151    }
 152 #ifdef SVGA_DEBUG
 153    sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
 154    SVGAlog(cbuf);
 155 #endif
 156
 157    vga_setmode(GraphMode);
 158    SVGABuffer.VideoRam=vga_getgraphmem();
 159 #ifdef SVGA_DEBUG
 160    sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
 161    SVGAlog(cbuf);
 162    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
 163    SVGAlog(cbuf);
 164 #endif
 165
 166    SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 167    SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 168
 169    return 0;
 170 }
 171
 172 int SVGAMesaClose( void )
 173 {
 174    vga_setmode(TEXT);
 175    free(SVGABuffer.FrontBuffer);
 176    free(SVGABuffer.BackBuffer);
 177    return 0;
 178 }
 179
 180 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 181 {
 182    if (ndx<256)
 183       vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 184 }
 185
 186 /**********************************************************************/
 187 /*****                 Miscellaneous functions                    *****/
 188 /**********************************************************************/
 189
 190 static void copy_buffer( const GLubyte * buffer) {
 191  int size = SVGABuffer.BufferSize, page = 0;
 192
 193 #ifdef SVGA_DEBUG
 194    sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
 195    SVGAlog(cbuf);
 196 #endif
 197
 198  while(size>0) {
 199  vga_setpage(page++);
 200   if (size>>16) {
 201    memcpy(SVGABuffer.VideoRam,buffer,0x10000);
 202    buffer+=0x10000;
 203   }else{
 204    memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
 205   }
 206   size-=0xffff;
 207  }
 208 }
 209
 210 static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 211 {
 212    *width = SVGAMesa->width = vga_getxdim();
 213    *height = SVGAMesa->height = vga_getydim();
 214 }
 215
 216 static void viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 217 {
 218    /* poll for window size change and realloc software Z/stencil/etc if needed */
 219    _mesa_ResizeBuffersMESA();
 220 }
 221
 222 static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 223                         GLenum buffer )
 224 {
 225    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 226     * function.
 227     */
 228    (void) colorBuffer;
 229
 230    if (buffer == GL_FRONT_LEFT) {
 231       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 232       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 233 #if 0
 234       void * tmpptr;
 235       /*    vga_waitretrace(); */
 236       copy_buffer(SVGABuffer.FrontBuffer);
 237       tmpptr=SVGABuffer.BackBuffer;
 238       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 239       SVGABuffer.FrontBuffer=tmpptr;
 240 #endif
 241    }
 242    else if (buffer == GL_BACK_LEFT) {
 243       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 244       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 245 #if 0
 246       /*    vga_waitretrace(); */
 247       copy_buffer(SVGABuffer.BackBuffer);
 248 #endif
 249    }
 250 }
 251
 252 /**********************************************************************/
 253 /*****                                                            *****/
 254 /**********************************************************************/
 255
 256 static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 257 {
 258    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
 259
 260    /* Initialize all the pointers in the DD struct.  Do this whenever */
 261    /* a new context is made current or we change buffers via set_buffer! */
 262
 263    ctx->Driver.UpdateState = svgamesa_update_state;
 264
 265    ctx->Driver.GetBufferSize = get_buffer_size;
 266    ctx->Driver.ResizeBuffers = _swrast_alloc_buffers;
 267    ctx->Driver.Viewport = viewport;
 268
 269    /* Software rasterizer pixel paths:
 270     */
 271    ctx->Driver.Accum = _swrast_Accum;
 272    ctx->Driver.Bitmap = _swrast_Bitmap;
 273    ctx->Driver.CopyPixels = _swrast_CopyPixels;
 274    ctx->Driver.DrawPixels = _swrast_DrawPixels;
 275    ctx->Driver.ReadPixels = _swrast_ReadPixels;
 276    ctx->Driver.DrawBuffer = _swrast_DrawBuffer;
 277
 278    /* Fill in the swrast driver interface:
 279     */
 280    swdd->SetBuffer = set_buffer;
 281
 282    switch (SVGABuffer.Depth) {
 283     case  8: ctx->Driver.ClearIndex = __clear_index8;
 284              ctx->Driver.Clear      = __clear8;
 285
 286              swdd->ReadCI32Span         = __read_ci32_span8;
 287              swdd->ReadCI32Pixels       = __read_ci32_pixels8;
 288              swdd->WriteCI8Span         = __write_ci8_span8;
 289              swdd->WriteCI32Span        = __write_ci32_span8;
 290              swdd->WriteCI32Pixels      = __write_ci32_pixels8;
 291              swdd->WriteMonoCISpan      = __write_mono_ci_span8;
 292              swdd->WriteMonoCIPixels    = __write_mono_ci_pixels8;
 293 #ifdef SVGA_DEBUG
 294     SVGAlog("SVGAUpdateState: 8 bit mode.");
 295 #endif
 296
 297              break;
 298     case 15: ctx->Driver.ClearColor = __clear_color15;
 299              ctx->Driver.Clear      = __clear15;
 300
 301              swdd->ReadRGBASpan         = __read_rgba_span15;
 302              swdd->ReadRGBAPixels       = __read_rgba_pixels15;
 303              swdd->WriteRGBASpan        = __write_rgba_span15;
 304              swdd->WriteRGBAPixels      = __write_rgba_pixels15;
 305              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span15;
 306              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels15;
 307 #ifdef SVGA_DEBUG
 308     SVGAlog("SVGAUpdateState: 15 bit mode.");
 309 #endif
 310              break;
 311     case 16: ctx->Driver.ClearColor = __clear_color16;
 312              ctx->Driver.Clear      = __clear16;
 313
 314              swdd->ReadRGBASpan         = __read_rgba_span16;
 315              swdd->ReadRGBAPixels       = __read_rgba_pixels16;
 316              swdd->WriteRGBASpan        = __write_rgba_span16;
 317              swdd->WriteRGBAPixels      = __write_rgba_pixels16;
 318              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span16;
 319              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels16;
 320              break;
 321 #ifdef SVGA_DEBUG
 322     SVGAlog("SVGAUpdateState: 16 bit mode.");
 323 #endif
 324     case 24: ctx->Driver.ClearColor = __clear_color24;
 325              ctx->Driver.Clear      = __clear24;
 326
 327              swdd->ReadRGBASpan         = __read_rgba_span24;
 328              swdd->ReadRGBAPixels       = __read_rgba_pixels24;
 329              swdd->WriteRGBASpan        = __write_rgba_span24;
 330              swdd->WriteRGBAPixels      = __write_rgba_pixels24;
 331              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span24;
 332              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels24;
 333              break;
 334 #ifdef SVGA_DEBUG
 335     SVGAlog("SVGAUpdateState: 32 bit mode.");
 336 #endif
 337     case 32: ctx->Driver.ClearColor = __clear_color32;
 338              ctx->Driver.Clear      = __clear32;
 339
 340              swdd->ReadRGBASpan         = __read_rgba_span32;
 341              swdd->ReadRGBAPixels       = __read_rgba_pixels32;
 342              swdd->WriteRGBASpan        = __write_rgba_span32;
 343              swdd->WriteRGBAPixels      = __write_rgba_pixels32;
 344              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span32;
 345              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels32;
 346    }
 347 }
 348
 349 /*
 350  * Create a new VGA/Mesa context and return a handle to it.
 351  */
 352 SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
 353 {
 354    SVGAMesaContext ctx;
 355 #ifndef DEV
 356    GLboolean rgb_flag;
 357    GLfloat redscale, greenscale, bluescale, alphascale;
 358    GLint index_bits;
 359    GLint redbits, greenbits, bluebits, alphabits;
 360
 361    /* determine if we're in RGB or color index mode */
 362    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 363       rgb_flag = GL_TRUE;
 364       redscale = greenscale = bluescale = alphascale = 255.0;
 365       redbits = greenbits = bluebits = 8;
 366       alphabits = 0;
 367       index_bits = 0;
 368    }
 369    else if (SVGABuffer.Depth==8) {
 370       rgb_flag = GL_FALSE;
 371       redscale = greenscale = bluescale = alphascale = 0.0;
 372       redbits = greenbits = bluebits = alphabits = 0;
 373       index_bits = 8;
 374    }
 375    else if (SVGABuffer.Depth==15) {
 376       rgb_flag = GL_TRUE;
 377       redscale = greenscale = bluescale = alphascale = 31.0;
 378       redbits = greenbits = bluebits = 5;
 379       alphabits = 0;
 380       index_bits = 0;
 381    }
 382    else if (SVGABuffer.Depth==16) {
 383       rgb_flag = GL_TRUE;
 384       redscale = bluescale = alphascale = 31.0;
 385       greenscale = 63.0;
 386       redbits = bluebits = 5;
 387       greenbits = 6;
 388       alphabits = 0;
 389       index_bits = 0;
 390    }
 391
 392    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 393    if (!ctx) {
 394       return NULL;
 395    }
 396
 397    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 398                                       doubleBuffer,
 399                                       GL_FALSE,  /* stereo */
 400                                       redbits, greenbits,
 401                                       bluebits, alphabits,
 402                                       index_bits,
 403                                       16,   /* depth_size */
 404                                       8,    /* stencil_size */
 405                                       16, 16, 16, 16,   /* accum_size */
 406                                       1     /* samples */
 407                                       );
 408
 409    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 410                                        NULL,  /* share list context */
 411                                        (void *) ctx, GL_FALSE );
 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       ctx->width = vga_getxdim();
 457       ctx->height = vga_getydim();
 458    }
 459 #endif
 460 }
 461
 462 /*
 463  * Return a handle to the current VGA/Mesa context.
 464  */
 465 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 466 {
 467    return SVGAMesa;
 468 }
 469
 470 /*
 471  * Swap front/back buffers for current context if double buffered.
 472  */
 473 void SVGAMesaSwapBuffers( void )
 474 {
 475 #if 000
 476    void * tmpptr;
 477 #endif
 478
 479    /* vga_waitretrace(); */
 480    copy_buffer(SVGABuffer.BackBuffer);
 481
 482 #ifndef DEV
 483    _mesa_notifySwapBuffers( SVGAMesa->gl_ctx );
 484    if (SVGAMesa->gl_vis->doubleBufferMode)
 485 #endif /* DEV */
 486    {
 487 #ifdef SVGA_DEBUG
 488       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 489       SVGAlog(cbuf);
 490 #endif /* SVGA_DEBUG */
 491 #if 000
 492       tmpptr=SVGABuffer.BackBuffer;
 493       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 494       SVGABuffer.FrontBuffer=tmpptr;
 495 #endif
 496 #ifdef SVGA_DEBUG
 497       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 498               "                      Readbuffer  : %p", \
 499               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 500       SVGAlog(cbuf);
 501 #endif /* SVGA_DEBUG */
 502    }
 503 }
 504
 505 #else /*SVGA*/
 506
 507 /*
 508  * Need this to provide at least one external definition when SVGA is
 509  * not defined on the compiler command line.
 510  */
 511 extern int gl_svga_dummy_function(void);
 512 int gl_svga_dummy_function(void)
 513 {
 514    return 0;
 515 }
 516
 517 #endif  /*SVGA*/
 518