src/mesa/drivers/svga/svgamesa.c

   1 /* $Id: svgamesa.c,v 1.27 2006/10/15 18:51:22 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 /**
 217  * We only implement this function as a mechanism to check if the
 218  * framebuffer size has changed (and update corresponding state).
 219  */
 220 static void viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 221 {
 222    GLuint newWidth, newHeight;
 223    GLframebuffer *buffer = ctx->WinSysDrawBuffer;
 224    get_buffer_size( buffer, &newWidth, &newHeight );
 225    if (buffer->Width != newWidth || buffer->Height != newHeight) {
 226       _mesa_resize_framebuffer(ctx, buffer, newWidth, newHeight );
 227    }
 228 }
 229
 230 static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 231                         GLenum buffer )
 232 {
 233    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 234     * function.
 235     */
 236    (void) colorBuffer;
 237
 238    if (buffer == GL_FRONT_LEFT) {
 239       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 240       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 241 #if 0
 242       void * tmpptr;
 243       /*    vga_waitretrace(); */
 244       copy_buffer(SVGABuffer.FrontBuffer);
 245       tmpptr=SVGABuffer.BackBuffer;
 246       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 247       SVGABuffer.FrontBuffer=tmpptr;
 248 #endif
 249    }
 250    else if (buffer == GL_BACK_LEFT) {
 251       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 252       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 253 #if 0
 254       /*    vga_waitretrace(); */
 255       copy_buffer(SVGABuffer.BackBuffer);
 256 #endif
 257    }
 258 }
 259
 260 /**********************************************************************/
 261 /*****                                                            *****/
 262 /**********************************************************************/
 263
 264 static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 265 {
 266    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
 267
 268    /* Initialize all the pointers in the DD struct.  Do this whenever */
 269    /* a new context is made current or we change buffers via set_buffer! */
 270
 271    ctx->Driver.UpdateState = svgamesa_update_state;
 272
 273    ctx->Driver.GetBufferSize = get_buffer_size;
 274    ctx->Driver.Viewport = viewport;
 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
 359    /* determine if we're in RGB or color index mode */
 360    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 361       rgb_flag = GL_TRUE;
 362       redscale = greenscale = bluescale = alphascale = 255.0;
 363       redbits = greenbits = bluebits = 8;
 364       alphabits = 0;
 365       index_bits = 0;
 366    }
 367    else if (SVGABuffer.Depth==8) {
 368       rgb_flag = GL_FALSE;
 369       redscale = greenscale = bluescale = alphascale = 0.0;
 370       redbits = greenbits = bluebits = alphabits = 0;
 371       index_bits = 8;
 372    }
 373    else if (SVGABuffer.Depth==15) {
 374       rgb_flag = GL_TRUE;
 375       redscale = greenscale = bluescale = alphascale = 31.0;
 376       redbits = greenbits = bluebits = 5;
 377       alphabits = 0;
 378       index_bits = 0;
 379    }
 380    else if (SVGABuffer.Depth==16) {
 381       rgb_flag = GL_TRUE;
 382       redscale = bluescale = alphascale = 31.0;
 383       greenscale = 63.0;
 384       redbits = bluebits = 5;
 385       greenbits = 6;
 386       alphabits = 0;
 387       index_bits = 0;
 388    }
 389
 390    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 391    if (!ctx) {
 392       return NULL;
 393    }
 394
 395    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 396                                       doubleBuffer,
 397                                       GL_FALSE,  /* stereo */
 398                                       redbits, greenbits,
 399                                       bluebits, alphabits,
 400                                       index_bits,
 401                                       16,   /* depth_size */
 402                                       8,    /* stencil_size */
 403                                       16, 16, 16, 16,   /* accum_size */
 404                                       1     /* samples */
 405                                       );
 406
 407    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 408                                        NULL,  /* share list context */
 409                                        (void *) ctx, GL_FALSE );
 410
 411    _mesa_enable_sw_extensions(ctx->gl_ctx);
 412    _mesa_enable_1_3_extensions(ctx->gl_ctx);
 413
 414    _mesa_init_driver_functions(&ctx->Driver);
 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       free( ctx );
 437       if (ctx==SVGAMesa) {
 438          SVGAMesa = NULL;
 439       }
 440    }
 441 #endif
 442 }
 443
 444 /*
 445  * Make the specified VGA/Mesa context the current one.
 446  */
 447 void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
 448 {
 449 #ifndef DEV
 450    SVGAMesa = ctx;
 451    svgamesa_update_state( ctx->gl_ctx, ~0 );
 452    _mesa_make_current( ctx->gl_ctx, ctx->gl_buffer );
 453
 454    if (ctx->width==0 || ctx->height==0) {
 455       ctx->width = vga_getxdim();
 456       ctx->height = vga_getydim();
 457    }
 458 #endif
 459 }
 460
 461 /*
 462  * Return a handle to the current VGA/Mesa context.
 463  */
 464 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 465 {
 466    return SVGAMesa;
 467 }
 468
 469 /*
 470  * Swap front/back buffers for current context if double buffered.
 471  */
 472 void SVGAMesaSwapBuffers( void )
 473 {
 474 #if 000
 475    void * tmpptr;
 476 #endif
 477
 478    /* vga_waitretrace(); */
 479    copy_buffer(SVGABuffer.BackBuffer);
 480
 481 #ifndef DEV
 482    _mesa_notifySwapBuffers( SVGAMesa->gl_ctx );
 483    if (SVGAMesa->gl_vis->doubleBufferMode)
 484 #endif /* DEV */
 485    {
 486 #ifdef SVGA_DEBUG
 487       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 488       SVGAlog(cbuf);
 489 #endif /* SVGA_DEBUG */
 490 #if 000
 491       tmpptr=SVGABuffer.BackBuffer;
 492       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 493       SVGABuffer.FrontBuffer=tmpptr;
 494 #endif
 495 #ifdef SVGA_DEBUG
 496       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 497               "                      Readbuffer  : %p", \
 498               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 499       SVGAlog(cbuf);
 500 #endif /* SVGA_DEBUG */
 501    }
 502 }
 503
 504 #else /*SVGA*/
 505
 506 /*
 507  * Need this to provide at least one external definition when SVGA is
 508  * not defined on the compiler command line.
 509  */
 510 extern int gl_svga_dummy_function(void);
 511 int gl_svga_dummy_function(void)
 512 {
 513    return 0;
 514 }
 515
 516 #endif  /*SVGA*/
 517