src/mesa/drivers/dri/swrast/swrast.c

   1 /*
   2  * Copyright (C) 2008 George Sapountzis <gsap7@yahoo.gr>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * DRI software rasterizer
  24  *
  25  * This is the mesa swrast module packaged into a DRI driver structure.
  26  *
  27  * The front-buffer is allocated by the loader. The loader provides read/write
  28  * callbacks for access to the front-buffer. The driver uses a scratch row for
  29  * front-buffer rendering to avoid repeated calls to the loader.
  30  *
  31  * The back-buffer is allocated by the driver and is private.
  32  */
  33
  34 #include "main/context.h"
  35 #include "main/extensions.h"
  36 #include "main/framebuffer.h"
  37 #include "main/imports.h"
  38 #include "main/renderbuffer.h"
  39 #include "swrast/swrast.h"
  40 #include "swrast_setup/swrast_setup.h"
  41 #include "tnl/tnl.h"
  42 #include "tnl/t_context.h"
  43 #include "tnl/t_pipeline.h"
  44 #include "vbo/vbo.h"
  45 #include "drivers/common/driverfuncs.h"
  46 #include "utils.h"
  47
  48 #include "swrast_priv.h"
  49
  50
  51 #define need_GL_VERSION_1_3
  52 #define need_GL_VERSION_1_4
  53 #define need_GL_VERSION_1_5
  54 #define need_GL_VERSION_2_0
  55 #define need_GL_VERSION_2_1
  56
  57 /* sw extensions for imaging */
  58 #define need_GL_EXT_blend_color
  59 #define need_GL_EXT_blend_minmax
  60 #define need_GL_EXT_convolution
  61 #define need_GL_EXT_histogram
  62 #define need_GL_SGI_color_table
  63
  64 /* sw extensions not associated with some GL version */
  65 #define need_GL_ARB_shader_objects
  66 #define need_GL_ARB_vertex_array_object
  67 #define need_GL_ARB_vertex_program
  68 #define need_GL_ARB_sync
  69 #define need_GL_APPLE_vertex_array_object
  70 #define need_GL_ATI_fragment_shader
  71 #define need_GL_ATI_separate_stencil
  72 #define need_GL_EXT_depth_bounds_test
  73 #define need_GL_EXT_framebuffer_object
  74 #define need_GL_EXT_framebuffer_blit
  75 #define need_GL_EXT_gpu_program_parameters
  76 #define need_GL_EXT_paletted_texture
  77 #define need_GL_EXT_stencil_two_side
  78 #define need_GL_MESA_resize_buffers
  79 #define need_GL_NV_vertex_program
  80 #define need_GL_NV_fragment_program
  81
  82 #include "extension_helper.h"
  83
  84 const struct dri_extension card_extensions[] =
  85 {
  86     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  87     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  88     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  89     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  90     { "GL_VERSION_2_1",                 GL_VERSION_2_1_functions },
  91
  92     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  93     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  94     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  95     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  96     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  97
  98     { "GL_ARB_depth_clamp",             NULL },
  99     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
 100     { "GL_ARB_vertex_array_object",     GL_ARB_vertex_array_object_functions },
 101     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
 102     { "GL_ARB_sync",                    GL_ARB_sync_functions },
 103     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
 104     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
 105     { "GL_ATI_separate_stencil",        GL_ATI_separate_stencil_functions },
 106     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
 107     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
 108     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 109     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 110     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 111     { "GL_EXT_stencil_two_side",        GL_EXT_stencil_two_side_functions },
 112     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 113     { "GL_NV_depth_clamp",              NULL },
 114     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 115     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 116     { NULL,                             NULL }
 117 };
 118
 119
 120 /**
 121  * Screen and config-related functions
 122  */
 123
 124 static void
 125 setupLoaderExtensions(__DRIscreen *psp,
 126                       const __DRIextension **extensions)
 127 {
 128     int i;
 129
 130     for (i = 0; extensions[i]; i++) {
 131         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 132             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 133     }
 134 }
 135
 136 static __DRIconfig **
 137 swrastFillInModes(__DRIscreen *psp,
 138                   unsigned pixel_bits, unsigned depth_bits,
 139                   unsigned stencil_bits, GLboolean have_back_buffer)
 140 {
 141     __DRIconfig **configs;
 142     unsigned depth_buffer_factor;
 143     unsigned back_buffer_factor;
 144     GLenum fb_format;
 145     GLenum fb_type;
 146
 147     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 148      * support pageflipping at all.
 149      */
 150     static const GLenum back_buffer_modes[] = {
 151         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 152     };
 153
 154     uint8_t depth_bits_array[4];
 155     uint8_t stencil_bits_array[4];
 156     uint8_t msaa_samples_array[1];
 157
 158     depth_bits_array[0] = 0;
 159     depth_bits_array[1] = 0;
 160     depth_bits_array[2] = depth_bits;
 161     depth_bits_array[3] = depth_bits;
 162
 163     /* Just like with the accumulation buffer, always provide some modes
 164      * with a stencil buffer.
 165      */
 166     stencil_bits_array[0] = 0;
 167     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 168     stencil_bits_array[2] = 0;
 169     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 170
 171     msaa_samples_array[0] = 0;
 172
 173     depth_buffer_factor = 4;
 174     back_buffer_factor = 2;
 175
 176     switch (pixel_bits) {
 177     case 8:
 178         fb_format = GL_RGB;
 179         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 180         break;
 181     case 16:
 182         fb_format = GL_RGB;
 183         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 184         break;
 185     case 24:
 186         fb_format = GL_BGR;
 187         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 188         break;
 189     case 32:
 190         fb_format = GL_BGRA;
 191         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 192         break;
 193     default:
 194         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 195                 pixel_bits);
 196         return NULL;
 197     }
 198
 199     configs = driCreateConfigs(fb_format, fb_type,
 200                                depth_bits_array, stencil_bits_array,
 201                                depth_buffer_factor, back_buffer_modes,
 202                                back_buffer_factor, msaa_samples_array, 1);
 203     if (configs == NULL) {
 204         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 205                 __LINE__);
 206         return NULL;
 207     }
 208
 209     return configs;
 210 }
 211
 212 static __DRIscreen *
 213 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 214                    const __DRIconfig ***driver_configs, void *data)
 215 {
 216     static const __DRIextension *emptyExtensionList[] = { NULL };
 217     __DRIscreen *psp;
 218     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 219
 220     (void) data;
 221
 222     TRACE;
 223
 224     psp = _mesa_calloc(sizeof(*psp));
 225     if (!psp)
 226         return NULL;
 227
 228     setupLoaderExtensions(psp, extensions);
 229
 230     psp->num = scrn;
 231     psp->extensions = emptyExtensionList;
 232
 233     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 234     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 235     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 236     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 237
 238     configs16 = driConcatConfigs(configs8, configs16);
 239     configs24 = driConcatConfigs(configs16, configs24);
 240     *driver_configs = (const __DRIconfig **)
 241        driConcatConfigs(configs24, configs32);
 242
 243     driInitExtensions( NULL, card_extensions, GL_FALSE );
 244
 245     return psp;
 246 }
 247
 248 static void driDestroyScreen(__DRIscreen *psp)
 249 {
 250     TRACE;
 251
 252     if (psp) {
 253         _mesa_free(psp);
 254     }
 255 }
 256
 257 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 258 {
 259     TRACE;
 260
 261     return psp->extensions;
 262 }
 263
 264
 265 /**
 266  * Framebuffer and renderbuffer-related functions.
 267  */
 268
 269 static GLuint
 270 choose_pixel_format(const GLvisual *v)
 271 {
 272     if (v->rgbMode) {
 273         int depth = v->rgbBits;
 274
 275         if (depth == 32
 276             && v->redMask   == 0xff0000
 277             && v->greenMask == 0x00ff00
 278             && v->blueMask  == 0x0000ff)
 279             return PF_A8R8G8B8;
 280         else if (depth == 24
 281             && v->redMask   == 0xff0000
 282             && v->greenMask == 0x00ff00
 283             && v->blueMask  == 0x0000ff)
 284             return PF_X8R8G8B8;
 285         else if (depth == 16
 286             && v->redMask   == 0xf800
 287             && v->greenMask == 0x07e0
 288             && v->blueMask  == 0x001f)
 289             return PF_R5G6B5;
 290         else if (depth == 8
 291             && v->redMask   == 0x07
 292             && v->greenMask == 0x38
 293             && v->blueMask  == 0xc0)
 294             return PF_R3G3B2;
 295     }
 296     else {
 297         if (v->indexBits == 8)
 298             return PF_CI8;
 299     }
 300
 301     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 302     return 0;
 303 }
 304
 305 static void
 306 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 307 {
 308     TRACE;
 309
 310     _mesa_free(rb->Data);
 311     _mesa_free(rb);
 312 }
 313
 314 static GLboolean
 315 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 316                            GLenum internalFormat, GLuint width, GLuint height)
 317 {
 318     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 319     unsigned mask = PITCH_ALIGN_BITS - 1;
 320
 321     TRACE;
 322
 323     rb->Data = NULL;
 324     rb->Width = width;
 325     rb->Height = height;
 326
 327     /* always pad to PITCH_ALIGN_BITS */
 328     xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
 329
 330     return GL_TRUE;
 331 }
 332
 333 static GLboolean
 334 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 335                           GLenum internalFormat, GLuint width, GLuint height)
 336 {
 337     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 338
 339     TRACE;
 340
 341     _mesa_free(rb->Data);
 342
 343     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 344
 345     rb->Data = _mesa_malloc(height * xrb->pitch);
 346
 347     return GL_TRUE;
 348 }
 349
 350 static struct swrast_renderbuffer *
 351 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 352 {
 353     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 354     GLuint pixel_format;
 355
 356     TRACE;
 357
 358     if (!xrb)
 359         return NULL;
 360
 361     _mesa_init_renderbuffer(&xrb->Base, 0);
 362
 363     pixel_format = choose_pixel_format(visual);
 364
 365     xrb->Base.Delete = swrast_delete_renderbuffer;
 366     if (front) {
 367         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 368         swrast_set_span_funcs_front(xrb, pixel_format);
 369     }
 370     else {
 371         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 372         swrast_set_span_funcs_back(xrb, pixel_format);
 373     }
 374
 375     switch (pixel_format) {
 376     case PF_A8R8G8B8:
 377         xrb->Base.InternalFormat = GL_RGBA;
 378         xrb->Base._BaseFormat = GL_RGBA;
 379         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 380         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 381         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 382         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 383         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 384         xrb->bpp = 32;
 385         break;
 386     case PF_X8R8G8B8:
 387         xrb->Base.InternalFormat = GL_RGB;
 388         xrb->Base._BaseFormat = GL_RGB;
 389         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 390         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 391         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 392         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 393         xrb->Base.AlphaBits = 0;
 394         xrb->bpp = 32;
 395         break;
 396     case PF_R5G6B5:
 397         xrb->Base.InternalFormat = GL_RGB;
 398         xrb->Base._BaseFormat = GL_RGB;
 399         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 400         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 401         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 402         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 403         xrb->Base.AlphaBits = 0;
 404         xrb->bpp = 16;
 405         break;
 406     case PF_R3G3B2:
 407         xrb->Base.InternalFormat = GL_RGB;
 408         xrb->Base._BaseFormat = GL_RGB;
 409         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 410         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 411         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 412         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 413         xrb->Base.AlphaBits = 0;
 414         xrb->bpp = 8;
 415         break;
 416     case PF_CI8:
 417         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 418         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 419         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 420         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 421         xrb->bpp = 8;
 422         break;
 423     default:
 424         return NULL;
 425     }
 426
 427     return xrb;
 428 }
 429
 430 static __DRIdrawable *
 431 driCreateNewDrawable(__DRIscreen *screen,
 432                      const __DRIconfig *config, void *data)
 433 {
 434     __DRIdrawable *buf;
 435     struct swrast_renderbuffer *frontrb, *backrb;
 436
 437     TRACE;
 438
 439     buf = _mesa_calloc(sizeof *buf);
 440     if (!buf)
 441         return NULL;
 442
 443     buf->loaderPrivate = data;
 444
 445     buf->driScreenPriv = screen;
 446
 447     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 448
 449     /* basic framebuffer setup */
 450     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 451
 452     /* add front renderbuffer */
 453     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 454     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 455
 456     /* add back renderbuffer */
 457     if (config->modes.doubleBufferMode) {
 458         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 459         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 460     }
 461
 462     /* add software renderbuffers */
 463     _mesa_add_soft_renderbuffers(&buf->Base,
 464                                  GL_FALSE, /* color */
 465                                  config->modes.haveDepthBuffer,
 466                                  config->modes.haveStencilBuffer,
 467                                  config->modes.haveAccumBuffer,
 468                                  GL_FALSE, /* alpha */
 469                                  GL_FALSE /* aux bufs */);
 470
 471     return buf;
 472 }
 473
 474 static void
 475 driDestroyDrawable(__DRIdrawable *buf)
 476 {
 477     TRACE;
 478
 479     if (buf) {
 480         struct gl_framebuffer *fb = &buf->Base;
 481
 482         _mesa_free(buf->row);
 483
 484         fb->DeletePending = GL_TRUE;
 485         _mesa_reference_framebuffer(&fb, NULL);
 486     }
 487 }
 488
 489 static void driSwapBuffers(__DRIdrawable *buf)
 490 {
 491     GET_CURRENT_CONTEXT(ctx);
 492
 493     struct swrast_renderbuffer *frontrb =
 494         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 495     struct swrast_renderbuffer *backrb =
 496         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 497
 498     __DRIscreen *screen = buf->driScreenPriv;
 499
 500     TRACE;
 501
 502     /* check for signle-buffered */
 503     if (backrb == NULL)
 504         return;
 505
 506     /* check if swapping currently bound buffer */
 507     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 508         /* flush pending rendering */
 509         _mesa_notifySwapBuffers(ctx);
 510     }
 511
 512     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 513                                     0, 0,
 514                                     frontrb->Base.Width,
 515                                     frontrb->Base.Height,
 516                                     backrb->Base.Data,
 517                                     buf->loaderPrivate);
 518 }
 519
 520
 521 /**
 522  * General device driver functions.
 523  */
 524
 525 static void
 526 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 527 {
 528     __DRIdrawable *buf = swrast_drawable(fb);
 529     __DRIscreen *screen = buf->driScreenPriv;
 530     int x, y;
 531
 532     screen->swrast_loader->getDrawableInfo(buf,
 533                                            &x, &y, w, h,
 534                                            buf->loaderPrivate);
 535 }
 536
 537 static void
 538 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 539 {
 540     GLsizei width, height;
 541
 542     get_window_size(fb, &width, &height);
 543     if (fb->Width != width || fb->Height != height) {
 544         _mesa_resize_framebuffer(ctx, fb, width, height);
 545     }
 546 }
 547
 548 static const GLubyte *
 549 get_string(GLcontext *ctx, GLenum pname)
 550 {
 551     (void) ctx;
 552     switch (pname) {
 553         case GL_VENDOR:
 554             return (const GLubyte *) "Mesa Project";
 555         case GL_RENDERER:
 556             return (const GLubyte *) "Software Rasterizer";
 557         default:
 558             return NULL;
 559     }
 560 }
 561
 562 static void
 563 update_state( GLcontext *ctx, GLuint new_state )
 564 {
 565     /* not much to do here - pass it on */
 566     _swrast_InvalidateState( ctx, new_state );
 567     _swsetup_InvalidateState( ctx, new_state );
 568     _vbo_InvalidateState( ctx, new_state );
 569     _tnl_InvalidateState( ctx, new_state );
 570 }
 571
 572 static void
 573 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 574 {
 575     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 576     GLframebuffer *read = ctx->WinSysReadBuffer;
 577
 578     swrast_check_and_update_window_size(ctx, draw);
 579     swrast_check_and_update_window_size(ctx, read);
 580 }
 581
 582 static void
 583 swrast_init_driver_functions(struct dd_function_table *driver)
 584 {
 585     driver->GetString = get_string;
 586     driver->UpdateState = update_state;
 587     driver->GetBufferSize = NULL;
 588     driver->Viewport = viewport;
 589 }
 590
 591
 592 /**
 593  * Context-related functions.
 594  */
 595
 596 static __DRIcontext *
 597 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 598                     __DRIcontext *shared, void *data)
 599 {
 600     __DRIcontext *ctx;
 601     GLcontext *mesaCtx;
 602     struct dd_function_table functions;
 603
 604     TRACE;
 605
 606     ctx = _mesa_calloc(sizeof *ctx);
 607     if (!ctx)
 608         return NULL;
 609
 610     ctx->loaderPrivate = data;
 611
 612     ctx->driScreenPriv = screen;
 613
 614     /* build table of device driver functions */
 615     _mesa_init_driver_functions(&functions);
 616     swrast_init_driver_functions(&functions);
 617
 618     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 619                                   shared ? &shared->Base : NULL,
 620                                   &functions, (void *) ctx)) {
 621       _mesa_free(ctx);
 622       return NULL;
 623     }
 624
 625     mesaCtx = &ctx->Base;
 626
 627     /* do bounds checking to prevent segfaults and server crashes! */
 628     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 629
 630     /* create module contexts */
 631     _swrast_CreateContext( mesaCtx );
 632     _vbo_CreateContext( mesaCtx );
 633     _tnl_CreateContext( mesaCtx );
 634     _swsetup_CreateContext( mesaCtx );
 635     _swsetup_Wakeup( mesaCtx );
 636
 637     /* use default TCL pipeline */
 638     {
 639        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 640        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 641     }
 642
 643     _mesa_enable_sw_extensions(mesaCtx);
 644     _mesa_enable_1_3_extensions(mesaCtx);
 645     _mesa_enable_1_4_extensions(mesaCtx);
 646     _mesa_enable_1_5_extensions(mesaCtx);
 647     _mesa_enable_2_0_extensions(mesaCtx);
 648     _mesa_enable_2_1_extensions(mesaCtx);
 649
 650     return ctx;
 651 }
 652
 653 static void
 654 driDestroyContext(__DRIcontext *ctx)
 655 {
 656     GLcontext *mesaCtx;
 657     TRACE;
 658
 659     if (ctx) {
 660         mesaCtx = &ctx->Base;
 661         _swsetup_DestroyContext( mesaCtx );
 662         _swrast_DestroyContext( mesaCtx );
 663         _tnl_DestroyContext( mesaCtx );
 664         _vbo_DestroyContext( mesaCtx );
 665         _mesa_destroy_context( mesaCtx );
 666     }
 667 }
 668
 669 static int
 670 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 671 {
 672     TRACE;
 673
 674     _mesa_copy_context(&src->Base, &dst->Base, mask);
 675     return GL_TRUE;
 676 }
 677
 678 static int driBindContext(__DRIcontext *ctx,
 679                           __DRIdrawable *draw,
 680                           __DRIdrawable *read)
 681 {
 682     GLcontext *mesaCtx;
 683     GLframebuffer *mesaDraw;
 684     GLframebuffer *mesaRead;
 685     TRACE;
 686
 687     if (ctx) {
 688         if (!draw || !read)
 689             return GL_FALSE;
 690
 691         mesaCtx = &ctx->Base;
 692         mesaDraw = &draw->Base;
 693         mesaRead = &read->Base;
 694
 695         /* check for same context and buffer */
 696         if (mesaCtx == _mesa_get_current_context()
 697             && mesaCtx->DrawBuffer == mesaDraw
 698             && mesaCtx->ReadBuffer == mesaRead) {
 699             return GL_TRUE;
 700         }
 701
 702         _glapi_check_multithread();
 703
 704         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 705         if (read != draw)
 706             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 707
 708         _mesa_make_current( mesaCtx,
 709                             mesaDraw,
 710                             mesaRead );
 711     }
 712     else {
 713         /* unbind */
 714         _mesa_make_current( NULL, NULL, NULL );
 715     }
 716
 717     return GL_TRUE;
 718 }
 719
 720 static int driUnbindContext(__DRIcontext *ctx)
 721 {
 722     TRACE;
 723     (void) ctx;
 724     return GL_TRUE;
 725 }
 726
 727
 728 static const __DRIcoreExtension driCoreExtension = {
 729     { __DRI_CORE, __DRI_CORE_VERSION },
 730     NULL, /* driCreateNewScreen */
 731     driDestroyScreen,
 732     driGetExtensions,
 733     driGetConfigAttrib,
 734     driIndexConfigAttrib,
 735     NULL, /* driCreateNewDrawable */
 736     driDestroyDrawable,
 737     driSwapBuffers,
 738     driCreateNewContext,
 739     driCopyContext,
 740     driDestroyContext,
 741     driBindContext,
 742     driUnbindContext
 743 };
 744
 745 static const __DRIswrastExtension driSWRastExtension = {
 746     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 747     driCreateNewScreen,
 748     driCreateNewDrawable
 749 };
 750
 751 /* This is the table of extensions that the loader will dlsym() for. */
 752 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 753     &driCoreExtension.base,
 754     &driSWRastExtension.base,
 755     NULL
 756 };