src/mesa/drivers/svga/svgamesa.c

   1
   2 /*
   3  * Mesa 3-D graphics library
   4  * Version:  5.0
   5  * Copyright (C) 1995-2002  Brian Paul
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Library General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Library General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Library General Public
  18  * License along with this library; if not, write to the Free
  19  * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20  */
  21
  22
  23 /*
  24  * SVGA driver for Mesa.
  25  * Original author:  Brian Paul
  26  * Additional authors:  Slawomir Szczyrba <steev@hot.pl>  (Mesa 3.2)
  27  */
  28
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "conf.h"
  32 #endif
  33
  34 #ifdef SVGA
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <vga.h>
  40 #include "GL/svgamesa.h"
  41 #include "main/buffers.h"
  42 #include "main/context.h"
  43 #include "main/extensions.h"
  44 #include "main/imports.h"
  45 #include "main/matrix.h"
  46 #include "main/mtypes.h"
  47 #include "swrast/swrast.h"
  48 #include "svgapix.h"
  49 #include "svgamesa8.h"
  50 #include "svgamesa15.h"
  51 #include "svgamesa16.h"
  52 #include "svgamesa24.h"
  53 #include "svgamesa32.h"
  54
  55 struct svga_buffer SVGABuffer;
  56 vga_modeinfo * SVGAInfo;
  57 SVGAMesaContext SVGAMesa;    /* the current context */
  58
  59 #ifdef SVGA_DEBUG
  60
  61 #include <sys/types.h>
  62 #include <signal.h>
  63
  64 FILE * logfile;
  65 char cbuf[1024]={0};
  66
  67 void SVGAlog(char * what)
  68 {
  69  logfile=fopen("svgamesa.log","a");
  70  if (!logfile) return;
  71  fprintf(logfile,"%s\n",what);
  72  fclose(logfile);
  73 }
  74 #endif
  75
  76 /**********************************************************************/
  77 /*****                       Init stuff...                        *****/
  78 /**********************************************************************/
  79
  80 int SVGAMesaInit( int GraphMode )
  81 {
  82    vga_init();
  83    if (!vga_hasmode(GraphMode))
  84    {
  85     fprintf(stderr,"GraphMode %d unavailable...",GraphMode);
  86 #ifdef SVGA_DEBUG
  87     SVGAlog("SVGAMesaInit: invalid GraphMode (doesn't exist)");
  88 #endif
  89     return(1);
  90    }
  91    SVGAInfo=vga_getmodeinfo(GraphMode);
  92    if (SVGAInfo->flags & IS_MODEX)
  93    {
  94     fprintf(stderr,"ModeX not implemented...");
  95 #ifdef SVGA_DEBUG
  96     SVGAlog("SVGAMesaInit: invalid GraphMode (ModeX)");
  97 #endif
  98     return(2);
  99    }
 100    if (!SVGAInfo->bytesperpixel)
 101    {
 102     fprintf(stderr,"1 / 4 bit color not implemented...");
 103 #ifdef SVGA_DEBUG
 104     SVGAlog("SVGAMesaInit: invalid GraphMode (1 or 4 bit)");
 105 #endif
 106     return(3);
 107    }
 108    switch (SVGAInfo->colors) {
 109     case   256: SVGABuffer.Depth = 8;  break;
 110     case 32768: SVGABuffer.Depth = 15; break;
 111     case 65536: SVGABuffer.Depth = 16; break;
 112     default: SVGABuffer.Depth = SVGAInfo->bytesperpixel<<3; break;
 113    }
 114    SVGABuffer.BufferSize=SVGAInfo->linewidth*SVGAInfo->height;
 115 #ifdef SVGA_DEBUG
 116    sprintf(cbuf,"SVGAMesaInit: double buffer info.\n" \
 117                  "              depth  : %d\n" \
 118                  "              mode   : %d\n" \
 119                  "              width  : %d\n" \
 120                  "              height : %d\n" \
 121                  "              bufsize: %d\n", \
 122                  SVGABuffer.Depth,GraphMode,SVGAInfo->linewidth, \
 123                  SVGAInfo->height,SVGABuffer.BufferSize);
 124    SVGAlog(cbuf);
 125 #endif
 126    SVGABuffer.FrontBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 127    if (!SVGABuffer.FrontBuffer) {
 128     {
 129      fprintf(stderr,"Not enough RAM for FRONT_LEFT_BUFFER...");
 130 #ifdef SVGA_DEBUG
 131      SVGAlog("SVGAMesaInit: Not enough RAM (front buffer)");
 132 #endif
 133      return(4);
 134     }
 135    }
 136 #ifdef SVGA_DEBUG
 137    sprintf(cbuf,"SVGAMesaInit: FrontBuffer - %p",SVGABuffer.FrontBuffer);
 138    SVGAlog(cbuf);
 139 #endif
 140    SVGABuffer.BackBuffer=(void*)malloc(SVGABuffer.BufferSize + 4);
 141    if (!SVGABuffer.BackBuffer) {
 142     {
 143      free(SVGABuffer.FrontBuffer);
 144      fprintf(stderr,"Not enough RAM for BACK_LEFT_BUFFER...");
 145 #ifdef SVGA_DEBUG
 146      SVGAlog("SVGAMesaInit: Not enough RAM (back buffer)");
 147 #endif
 148      return(5);
 149     }
 150    }
 151 #ifdef SVGA_DEBUG
 152    sprintf(cbuf,"SVGAMesaInit: BackBuffer - %p",SVGABuffer.BackBuffer);
 153    SVGAlog(cbuf);
 154 #endif
 155
 156    vga_setmode(GraphMode);
 157    SVGABuffer.VideoRam=vga_getgraphmem();
 158 #ifdef SVGA_DEBUG
 159    sprintf(cbuf,"SVGAMesaInit: VRAM - %p",SVGABuffer.VideoRam);
 160    SVGAlog(cbuf);
 161    sprintf(cbuf,"SVGAMesaInit: done. (Mode %d)",GraphMode);
 162    SVGAlog(cbuf);
 163 #endif
 164
 165    SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 166    SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 167
 168    return 0;
 169 }
 170
 171 int SVGAMesaClose( void )
 172 {
 173    vga_setmode(TEXT);
 174    free(SVGABuffer.FrontBuffer);
 175    free(SVGABuffer.BackBuffer);
 176    return 0;
 177 }
 178
 179 void SVGAMesaSetCI(int ndx, GLubyte red, GLubyte green, GLubyte blue)
 180 {
 181    if (ndx<256)
 182       vga_setpalette(ndx, red>>2, green>>2, blue>>2);
 183 }
 184
 185 /**********************************************************************/
 186 /*****                 Miscellaneous functions                    *****/
 187 /**********************************************************************/
 188
 189 static void copy_buffer( const GLubyte * buffer) {
 190  int size = SVGABuffer.BufferSize, page = 0;
 191
 192 #ifdef SVGA_DEBUG
 193    sprintf(cbuf,"copy_buffer: copy %p to %p",buffer,SVGABuffer.VideoRam);
 194    SVGAlog(cbuf);
 195 #endif
 196
 197  while(size>0) {
 198  vga_setpage(page++);
 199   if (size>>16) {
 200    memcpy(SVGABuffer.VideoRam,buffer,0x10000);
 201    buffer+=0x10000;
 202   }else{
 203    memcpy(SVGABuffer.VideoRam,buffer,size & 0xffff);
 204   }
 205   size-=0xffff;
 206  }
 207 }
 208
 209 static void get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
 210 {
 211    *width = SVGAMesa->width = vga_getxdim();
 212    *height = SVGAMesa->height = vga_getydim();
 213 }
 214
 215 /**
 216  * We only implement this function as a mechanism to check if the
 217  * framebuffer size has changed (and update corresponding state).
 218  */
 219 static void viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 220 {
 221    GLuint newWidth, newHeight;
 222    GLframebuffer *buffer = ctx->WinSysDrawBuffer;
 223    get_buffer_size( buffer, &newWidth, &newHeight );
 224    if (buffer->Width != newWidth || buffer->Height != newHeight) {
 225       _mesa_resize_framebuffer(ctx, buffer, newWidth, newHeight );
 226    }
 227 }
 228
 229 static void set_buffer( GLcontext *ctx, GLframebuffer *colorBuffer,
 230                         GLenum buffer )
 231 {
 232    /* We can ignore colorBuffer since we don't support a MakeCurrentRead()
 233     * function.
 234     */
 235    (void) colorBuffer;
 236
 237    if (buffer == GL_FRONT_LEFT) {
 238       SVGABuffer.ReadBuffer = SVGABuffer.FrontBuffer;
 239       SVGABuffer.DrawBuffer = SVGABuffer.FrontBuffer;
 240 #if 0
 241       void * tmpptr;
 242       /*    vga_waitretrace(); */
 243       copy_buffer(SVGABuffer.FrontBuffer);
 244       tmpptr=SVGABuffer.BackBuffer;
 245       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 246       SVGABuffer.FrontBuffer=tmpptr;
 247 #endif
 248    }
 249    else if (buffer == GL_BACK_LEFT) {
 250       SVGABuffer.ReadBuffer = SVGABuffer.BackBuffer;
 251       SVGABuffer.DrawBuffer = SVGABuffer.BackBuffer;
 252 #if 0
 253       /*    vga_waitretrace(); */
 254       copy_buffer(SVGABuffer.BackBuffer);
 255 #endif
 256    }
 257 }
 258
 259 /**********************************************************************/
 260 /*****                                                            *****/
 261 /**********************************************************************/
 262
 263 static void svgamesa_update_state( GLcontext *ctx, GLuint new_state )
 264 {
 265    struct swrast_device_driver *swdd = _swrast_GetDeviceDriverReference( ctx );
 266
 267    /* Initialize all the pointers in the DD struct.  Do this whenever */
 268    /* a new context is made current or we change buffers via set_buffer! */
 269
 270    ctx->Driver.UpdateState = svgamesa_update_state;
 271
 272    ctx->Driver.GetBufferSize = get_buffer_size;
 273    ctx->Driver.Viewport = viewport;
 274
 275    /* Fill in the swrast driver interface:
 276     */
 277    swdd->SetBuffer = set_buffer;
 278
 279    switch (SVGABuffer.Depth) {
 280     case  8: ctx->Driver.ClearIndex = __clear_index8;
 281              ctx->Driver.Clear      = __clear8;
 282
 283              swdd->ReadCI32Span         = __read_ci32_span8;
 284              swdd->ReadCI32Pixels       = __read_ci32_pixels8;
 285              swdd->WriteCI8Span         = __write_ci8_span8;
 286              swdd->WriteCI32Span        = __write_ci32_span8;
 287              swdd->WriteCI32Pixels      = __write_ci32_pixels8;
 288              swdd->WriteMonoCISpan      = __write_mono_ci_span8;
 289              swdd->WriteMonoCIPixels    = __write_mono_ci_pixels8;
 290 #ifdef SVGA_DEBUG
 291     SVGAlog("SVGAUpdateState: 8 bit mode.");
 292 #endif
 293
 294              break;
 295     case 15: ctx->Driver.ClearColor = __clear_color15;
 296              ctx->Driver.Clear      = __clear15;
 297
 298              swdd->ReadRGBASpan         = __read_rgba_span15;
 299              swdd->ReadRGBAPixels       = __read_rgba_pixels15;
 300              swdd->WriteRGBASpan        = __write_rgba_span15;
 301              swdd->WriteRGBAPixels      = __write_rgba_pixels15;
 302              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span15;
 303              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels15;
 304 #ifdef SVGA_DEBUG
 305     SVGAlog("SVGAUpdateState: 15 bit mode.");
 306 #endif
 307              break;
 308     case 16: ctx->Driver.ClearColor = __clear_color16;
 309              ctx->Driver.Clear      = __clear16;
 310
 311              swdd->ReadRGBASpan         = __read_rgba_span16;
 312              swdd->ReadRGBAPixels       = __read_rgba_pixels16;
 313              swdd->WriteRGBASpan        = __write_rgba_span16;
 314              swdd->WriteRGBAPixels      = __write_rgba_pixels16;
 315              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span16;
 316              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels16;
 317              break;
 318 #ifdef SVGA_DEBUG
 319     SVGAlog("SVGAUpdateState: 16 bit mode.");
 320 #endif
 321     case 24: ctx->Driver.ClearColor = __clear_color24;
 322              ctx->Driver.Clear      = __clear24;
 323
 324              swdd->ReadRGBASpan         = __read_rgba_span24;
 325              swdd->ReadRGBAPixels       = __read_rgba_pixels24;
 326              swdd->WriteRGBASpan        = __write_rgba_span24;
 327              swdd->WriteRGBAPixels      = __write_rgba_pixels24;
 328              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span24;
 329              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels24;
 330              break;
 331 #ifdef SVGA_DEBUG
 332     SVGAlog("SVGAUpdateState: 32 bit mode.");
 333 #endif
 334     case 32: ctx->Driver.ClearColor = __clear_color32;
 335              ctx->Driver.Clear      = __clear32;
 336
 337              swdd->ReadRGBASpan         = __read_rgba_span32;
 338              swdd->ReadRGBAPixels       = __read_rgba_pixels32;
 339              swdd->WriteRGBASpan        = __write_rgba_span32;
 340              swdd->WriteRGBAPixels      = __write_rgba_pixels32;
 341              swdd->WriteMonoRGBASpan    = __write_mono_rgba_span32;
 342              swdd->WriteMonoRGBAPixels  = __write_mono_rgba_pixels32;
 343    }
 344 }
 345
 346 /*
 347  * Create a new VGA/Mesa context and return a handle to it.
 348  */
 349 SVGAMesaContext SVGAMesaCreateContext( GLboolean doubleBuffer )
 350 {
 351    SVGAMesaContext ctx;
 352 #ifndef DEV
 353    GLboolean rgb_flag;
 354    GLfloat redscale, greenscale, bluescale, alphascale;
 355    GLint index_bits;
 356    GLint redbits, greenbits, bluebits, alphabits;
 357
 358    /* determine if we're in RGB or color index mode */
 359    if ((SVGABuffer.Depth==32) || (SVGABuffer.Depth==24)) {
 360       rgb_flag = GL_TRUE;
 361       redscale = greenscale = bluescale = alphascale = 255.0;
 362       redbits = greenbits = bluebits = 8;
 363       alphabits = 0;
 364       index_bits = 0;
 365    }
 366    else if (SVGABuffer.Depth==8) {
 367       rgb_flag = GL_FALSE;
 368       redscale = greenscale = bluescale = alphascale = 0.0;
 369       redbits = greenbits = bluebits = alphabits = 0;
 370       index_bits = 8;
 371    }
 372    else if (SVGABuffer.Depth==15) {
 373       rgb_flag = GL_TRUE;
 374       redscale = greenscale = bluescale = alphascale = 31.0;
 375       redbits = greenbits = bluebits = 5;
 376       alphabits = 0;
 377       index_bits = 0;
 378    }
 379    else if (SVGABuffer.Depth==16) {
 380       rgb_flag = GL_TRUE;
 381       redscale = bluescale = alphascale = 31.0;
 382       greenscale = 63.0;
 383       redbits = bluebits = 5;
 384       greenbits = 6;
 385       alphabits = 0;
 386       index_bits = 0;
 387    }
 388
 389    ctx = (SVGAMesaContext) calloc( 1, sizeof(struct svgamesa_context) );
 390    if (!ctx) {
 391       return NULL;
 392    }
 393
 394    ctx->gl_vis = _mesa_create_visual( rgb_flag,
 395                                       doubleBuffer,
 396                                       GL_FALSE,  /* stereo */
 397                                       redbits, greenbits,
 398                                       bluebits, alphabits,
 399                                       index_bits,
 400                                       16,   /* depth_size */
 401                                       8,    /* stencil_size */
 402                                       16, 16, 16, 16,   /* accum_size */
 403                                       1     /* samples */
 404                                       );
 405
 406    ctx->gl_ctx = _mesa_create_context( ctx->gl_vis,
 407                                        NULL,  /* share list context */
 408                                        (void *) ctx, GL_FALSE );
 409
 410    _mesa_enable_sw_extensions(ctx->gl_ctx);
 411    _mesa_enable_1_3_extensions(ctx->gl_ctx);
 412
 413    _mesa_init_driver_functions(&ctx->Driver);
 414
 415    ctx->gl_buffer = _mesa_create_framebuffer( ctx->gl_vis,
 416                                               ctx->gl_vis->depthBits > 0,
 417                                               ctx->gl_vis->stencilBits > 0,
 418                                               ctx->gl_vis->accumRedBits > 0,
 419                                               ctx->gl_vis->alphaBits > 0 );
 420
 421    ctx->width = ctx->height = 0;  /* temporary until first "make-current" */
 422 #endif
 423    return ctx;
 424 }
 425
 426 /*
 427  * Destroy the given VGA/Mesa context.
 428  */
 429 void SVGAMesaDestroyContext( SVGAMesaContext ctx )
 430 {
 431 #ifndef DEV
 432    if (ctx) {
 433       _mesa_destroy_visual( ctx->gl_vis );
 434       _mesa_destroy_context( ctx->gl_ctx );
 435       free( ctx );
 436       if (ctx==SVGAMesa) {
 437          SVGAMesa = NULL;
 438       }
 439    }
 440 #endif
 441 }
 442
 443 /*
 444  * Make the specified VGA/Mesa context the current one.
 445  */
 446 void SVGAMesaMakeCurrent( SVGAMesaContext ctx )
 447 {
 448 #ifndef DEV
 449    SVGAMesa = ctx;
 450    svgamesa_update_state( ctx->gl_ctx, ~0 );
 451    _mesa_make_current( ctx->gl_ctx, ctx->gl_buffer );
 452
 453    if (ctx->width==0 || ctx->height==0) {
 454       ctx->width = vga_getxdim();
 455       ctx->height = vga_getydim();
 456    }
 457 #endif
 458 }
 459
 460 /*
 461  * Return a handle to the current VGA/Mesa context.
 462  */
 463 SVGAMesaContext SVGAMesaGetCurrentContext( void )
 464 {
 465    return SVGAMesa;
 466 }
 467
 468 /*
 469  * Swap front/back buffers for current context if double buffered.
 470  */
 471 void SVGAMesaSwapBuffers( void )
 472 {
 473 #if 000
 474    void * tmpptr;
 475 #endif
 476
 477    /* vga_waitretrace(); */
 478    copy_buffer(SVGABuffer.BackBuffer);
 479
 480 #ifndef DEV
 481    _mesa_notifySwapBuffers( SVGAMesa->gl_ctx );
 482    if (SVGAMesa->gl_vis->doubleBufferMode)
 483 #endif /* DEV */
 484    {
 485 #ifdef SVGA_DEBUG
 486       sprintf(cbuf,"SVGAMesaSwapBuffers : Swapping...");
 487       SVGAlog(cbuf);
 488 #endif /* SVGA_DEBUG */
 489 #if 000
 490       tmpptr=SVGABuffer.BackBuffer;
 491       SVGABuffer.BackBuffer=SVGABuffer.FrontBuffer;
 492       SVGABuffer.FrontBuffer=tmpptr;
 493 #endif
 494 #ifdef SVGA_DEBUG
 495       sprintf(cbuf,"SVGAMesaSwapBuffers : WriteBuffer : %p\n"
 496               "                      Readbuffer  : %p", \
 497               SVGABuffer.BackBuffer, SVGABuffer.FrontBuffer );
 498       SVGAlog(cbuf);
 499 #endif /* SVGA_DEBUG */
 500    }
 501 }
 502
 503 #else /*SVGA*/
 504
 505 /*
 506  * Need this to provide at least one external definition when SVGA is
 507  * not defined on the compiler command line.
 508  */
 509 extern int gl_svga_dummy_function(void);
 510 int gl_svga_dummy_function(void)
 511 {
 512    return 0;
 513 }
 514
 515 #endif  /*SVGA*/
 516