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 "drivers/common/meta.h"
  47 #include "utils.h"
  48
  49 #include "swrast_priv.h"
  50
  51
  52 #define need_GL_VERSION_1_3
  53 #define need_GL_VERSION_1_4
  54 #define need_GL_VERSION_1_5
  55 #define need_GL_VERSION_2_0
  56 #define need_GL_VERSION_2_1
  57
  58 /* sw extensions for imaging */
  59 #define need_GL_EXT_blend_color
  60 #define need_GL_EXT_blend_minmax
  61 #define need_GL_EXT_convolution
  62 #define need_GL_EXT_histogram
  63 #define need_GL_SGI_color_table
  64
  65 /* sw extensions not associated with some GL version */
  66 #define need_GL_ARB_draw_elements_base_vertex
  67 #define need_GL_ARB_shader_objects
  68 #define need_GL_ARB_vertex_array_object
  69 #define need_GL_ARB_vertex_program
  70 #define need_GL_ARB_sync
  71 #define need_GL_APPLE_vertex_array_object
  72 #define need_GL_ATI_fragment_shader
  73 #define need_GL_ATI_separate_stencil
  74 #define need_GL_EXT_depth_bounds_test
  75 #define need_GL_EXT_framebuffer_object
  76 #define need_GL_EXT_framebuffer_blit
  77 #define need_GL_EXT_gpu_program_parameters
  78 #define need_GL_EXT_paletted_texture
  79 #define need_GL_EXT_stencil_two_side
  80 #define need_GL_MESA_resize_buffers
  81 #define need_GL_NV_vertex_program
  82 #define need_GL_NV_fragment_program
  83
  84 #include "extension_helper.h"
  85
  86 const struct dri_extension card_extensions[] =
  87 {
  88     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  89     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  90     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  91     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  92     { "GL_VERSION_2_1",                 GL_VERSION_2_1_functions },
  93
  94     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  95     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  96     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  97     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  98     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  99
 100     { "GL_ARB_depth_clamp",             NULL },
 101     { "GL_ARB_draw_elements_base_vertex", GL_ARB_draw_elements_base_vertex_functions },
 102     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
 103     { "GL_ARB_vertex_array_object",     GL_ARB_vertex_array_object_functions },
 104     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
 105     { "GL_ARB_sync",                    GL_ARB_sync_functions },
 106     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
 107     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
 108     { "GL_ATI_separate_stencil",        GL_ATI_separate_stencil_functions },
 109     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
 110     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
 111     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 112     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 113     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 114     { "GL_EXT_stencil_two_side",        GL_EXT_stencil_two_side_functions },
 115     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 116     { "GL_NV_depth_clamp",              NULL },
 117     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 118     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 119     { NULL,                             NULL }
 120 };
 121
 122
 123 /**
 124  * Screen and config-related functions
 125  */
 126
 127 static void
 128 setupLoaderExtensions(__DRIscreen *psp,
 129                       const __DRIextension **extensions)
 130 {
 131     int i;
 132
 133     for (i = 0; extensions[i]; i++) {
 134         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 135             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 136     }
 137 }
 138
 139 static __DRIconfig **
 140 swrastFillInModes(__DRIscreen *psp,
 141                   unsigned pixel_bits, unsigned depth_bits,
 142                   unsigned stencil_bits, GLboolean have_back_buffer)
 143 {
 144     __DRIconfig **configs;
 145     unsigned depth_buffer_factor;
 146     unsigned back_buffer_factor;
 147     GLenum fb_format;
 148     GLenum fb_type;
 149
 150     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 151      * support pageflipping at all.
 152      */
 153     static const GLenum back_buffer_modes[] = {
 154         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 155     };
 156
 157     uint8_t depth_bits_array[4];
 158     uint8_t stencil_bits_array[4];
 159     uint8_t msaa_samples_array[1];
 160
 161     depth_bits_array[0] = 0;
 162     depth_bits_array[1] = 0;
 163     depth_bits_array[2] = depth_bits;
 164     depth_bits_array[3] = depth_bits;
 165
 166     /* Just like with the accumulation buffer, always provide some modes
 167      * with a stencil buffer.
 168      */
 169     stencil_bits_array[0] = 0;
 170     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 171     stencil_bits_array[2] = 0;
 172     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 173
 174     msaa_samples_array[0] = 0;
 175
 176     depth_buffer_factor = 4;
 177     back_buffer_factor = 2;
 178
 179     switch (pixel_bits) {
 180     case 8:
 181         fb_format = GL_RGB;
 182         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 183         break;
 184     case 16:
 185         fb_format = GL_RGB;
 186         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 187         break;
 188     case 24:
 189         fb_format = GL_BGR;
 190         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 191         break;
 192     case 32:
 193         fb_format = GL_BGRA;
 194         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 195         break;
 196     default:
 197         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 198                 pixel_bits);
 199         return NULL;
 200     }
 201
 202     configs = driCreateConfigs(fb_format, fb_type,
 203                                depth_bits_array, stencil_bits_array,
 204                                depth_buffer_factor, back_buffer_modes,
 205                                back_buffer_factor, msaa_samples_array, 1);
 206     if (configs == NULL) {
 207         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 208                 __LINE__);
 209         return NULL;
 210     }
 211
 212     return configs;
 213 }
 214
 215 static __DRIscreen *
 216 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 217                    const __DRIconfig ***driver_configs, void *data)
 218 {
 219     static const __DRIextension *emptyExtensionList[] = { NULL };
 220     __DRIscreen *psp;
 221     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 222
 223     (void) data;
 224
 225     TRACE;
 226
 227     psp = _mesa_calloc(sizeof(*psp));
 228     if (!psp)
 229         return NULL;
 230
 231     setupLoaderExtensions(psp, extensions);
 232
 233     psp->num = scrn;
 234     psp->extensions = emptyExtensionList;
 235
 236     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 237     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 238     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 239     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 240
 241     configs16 = driConcatConfigs(configs8, configs16);
 242     configs24 = driConcatConfigs(configs16, configs24);
 243     *driver_configs = (const __DRIconfig **)
 244        driConcatConfigs(configs24, configs32);
 245
 246     driInitExtensions( NULL, card_extensions, GL_FALSE );
 247
 248     return psp;
 249 }
 250
 251 static void driDestroyScreen(__DRIscreen *psp)
 252 {
 253     TRACE;
 254
 255     if (psp) {
 256         _mesa_free(psp);
 257     }
 258 }
 259
 260 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 261 {
 262     TRACE;
 263
 264     return psp->extensions;
 265 }
 266
 267
 268 /**
 269  * Framebuffer and renderbuffer-related functions.
 270  */
 271
 272 static GLuint
 273 choose_pixel_format(const GLvisual *v)
 274 {
 275     if (v->rgbMode) {
 276         int depth = v->rgbBits;
 277
 278         if (depth == 32
 279             && v->redMask   == 0xff0000
 280             && v->greenMask == 0x00ff00
 281             && v->blueMask  == 0x0000ff)
 282             return PF_A8R8G8B8;
 283         else if (depth == 24
 284             && v->redMask   == 0xff0000
 285             && v->greenMask == 0x00ff00
 286             && v->blueMask  == 0x0000ff)
 287             return PF_X8R8G8B8;
 288         else if (depth == 16
 289             && v->redMask   == 0xf800
 290             && v->greenMask == 0x07e0
 291             && v->blueMask  == 0x001f)
 292             return PF_R5G6B5;
 293         else if (depth == 8
 294             && v->redMask   == 0x07
 295             && v->greenMask == 0x38
 296             && v->blueMask  == 0xc0)
 297             return PF_R3G3B2;
 298     }
 299     else {
 300         if (v->indexBits == 8)
 301             return PF_CI8;
 302     }
 303
 304     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 305     return 0;
 306 }
 307
 308 static void
 309 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 310 {
 311     TRACE;
 312
 313     _mesa_free(rb->Data);
 314     _mesa_free(rb);
 315 }
 316
 317 static GLboolean
 318 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 319                            GLenum internalFormat, GLuint width, GLuint height)
 320 {
 321     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 322     unsigned mask = PITCH_ALIGN_BITS - 1;
 323
 324     TRACE;
 325
 326     rb->Data = NULL;
 327     rb->Width = width;
 328     rb->Height = height;
 329
 330     /* always pad to PITCH_ALIGN_BITS */
 331     xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
 332
 333     return GL_TRUE;
 334 }
 335
 336 static GLboolean
 337 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 338                           GLenum internalFormat, GLuint width, GLuint height)
 339 {
 340     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 341
 342     TRACE;
 343
 344     _mesa_free(rb->Data);
 345
 346     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 347
 348     rb->Data = _mesa_malloc(height * xrb->pitch);
 349
 350     return GL_TRUE;
 351 }
 352
 353 static struct swrast_renderbuffer *
 354 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 355 {
 356     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 357     GLuint pixel_format;
 358
 359     TRACE;
 360
 361     if (!xrb)
 362         return NULL;
 363
 364     _mesa_init_renderbuffer(&xrb->Base, 0);
 365
 366     pixel_format = choose_pixel_format(visual);
 367
 368     xrb->Base.Delete = swrast_delete_renderbuffer;
 369     if (front) {
 370         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 371         swrast_set_span_funcs_front(xrb, pixel_format);
 372     }
 373     else {
 374         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 375         swrast_set_span_funcs_back(xrb, pixel_format);
 376     }
 377
 378     switch (pixel_format) {
 379     case PF_A8R8G8B8:
 380         xrb->Base.InternalFormat = GL_RGBA;
 381         xrb->Base._BaseFormat = GL_RGBA;
 382         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 383         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 384         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 385         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 386         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 387         xrb->bpp = 32;
 388         break;
 389     case PF_X8R8G8B8:
 390         xrb->Base.InternalFormat = GL_RGB;
 391         xrb->Base._BaseFormat = GL_RGB;
 392         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 393         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 394         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 395         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 396         xrb->Base.AlphaBits = 0;
 397         xrb->bpp = 32;
 398         break;
 399     case PF_R5G6B5:
 400         xrb->Base.InternalFormat = GL_RGB;
 401         xrb->Base._BaseFormat = GL_RGB;
 402         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 403         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 404         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 405         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 406         xrb->Base.AlphaBits = 0;
 407         xrb->bpp = 16;
 408         break;
 409     case PF_R3G3B2:
 410         xrb->Base.InternalFormat = GL_RGB;
 411         xrb->Base._BaseFormat = GL_RGB;
 412         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 413         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 414         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 415         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 416         xrb->Base.AlphaBits = 0;
 417         xrb->bpp = 8;
 418         break;
 419     case PF_CI8:
 420         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 421         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 422         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 423         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 424         xrb->bpp = 8;
 425         break;
 426     default:
 427         return NULL;
 428     }
 429
 430     return xrb;
 431 }
 432
 433 static __DRIdrawable *
 434 driCreateNewDrawable(__DRIscreen *screen,
 435                      const __DRIconfig *config, void *data)
 436 {
 437     __DRIdrawable *buf;
 438     struct swrast_renderbuffer *frontrb, *backrb;
 439
 440     TRACE;
 441
 442     buf = _mesa_calloc(sizeof *buf);
 443     if (!buf)
 444         return NULL;
 445
 446     buf->loaderPrivate = data;
 447
 448     buf->driScreenPriv = screen;
 449
 450     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 451
 452     /* basic framebuffer setup */
 453     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 454
 455     /* add front renderbuffer */
 456     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 457     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 458
 459     /* add back renderbuffer */
 460     if (config->modes.doubleBufferMode) {
 461         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 462         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 463     }
 464
 465     /* add software renderbuffers */
 466     _mesa_add_soft_renderbuffers(&buf->Base,
 467                                  GL_FALSE, /* color */
 468                                  config->modes.haveDepthBuffer,
 469                                  config->modes.haveStencilBuffer,
 470                                  config->modes.haveAccumBuffer,
 471                                  GL_FALSE, /* alpha */
 472                                  GL_FALSE /* aux bufs */);
 473
 474     return buf;
 475 }
 476
 477 static void
 478 driDestroyDrawable(__DRIdrawable *buf)
 479 {
 480     TRACE;
 481
 482     if (buf) {
 483         struct gl_framebuffer *fb = &buf->Base;
 484
 485         _mesa_free(buf->row);
 486
 487         fb->DeletePending = GL_TRUE;
 488         _mesa_reference_framebuffer(&fb, NULL);
 489     }
 490 }
 491
 492 static void driSwapBuffers(__DRIdrawable *buf)
 493 {
 494     GET_CURRENT_CONTEXT(ctx);
 495
 496     struct swrast_renderbuffer *frontrb =
 497         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 498     struct swrast_renderbuffer *backrb =
 499         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 500
 501     __DRIscreen *screen = buf->driScreenPriv;
 502
 503     TRACE;
 504
 505     /* check for signle-buffered */
 506     if (backrb == NULL)
 507         return;
 508
 509     /* check if swapping currently bound buffer */
 510     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 511         /* flush pending rendering */
 512         _mesa_notifySwapBuffers(ctx);
 513     }
 514
 515     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 516                                     0, 0,
 517                                     frontrb->Base.Width,
 518                                     frontrb->Base.Height,
 519                                     backrb->Base.Data,
 520                                     buf->loaderPrivate);
 521 }
 522
 523
 524 /**
 525  * General device driver functions.
 526  */
 527
 528 static void
 529 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 530 {
 531     __DRIdrawable *buf = swrast_drawable(fb);
 532     __DRIscreen *screen = buf->driScreenPriv;
 533     int x, y;
 534
 535     screen->swrast_loader->getDrawableInfo(buf,
 536                                            &x, &y, w, h,
 537                                            buf->loaderPrivate);
 538 }
 539
 540 static void
 541 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 542 {
 543     GLsizei width, height;
 544
 545     get_window_size(fb, &width, &height);
 546     if (fb->Width != width || fb->Height != height) {
 547         _mesa_resize_framebuffer(ctx, fb, width, height);
 548     }
 549 }
 550
 551 static const GLubyte *
 552 get_string(GLcontext *ctx, GLenum pname)
 553 {
 554     (void) ctx;
 555     switch (pname) {
 556         case GL_VENDOR:
 557             return (const GLubyte *) "Mesa Project";
 558         case GL_RENDERER:
 559             return (const GLubyte *) "Software Rasterizer";
 560         default:
 561             return NULL;
 562     }
 563 }
 564
 565 static void
 566 update_state( GLcontext *ctx, GLuint new_state )
 567 {
 568     /* not much to do here - pass it on */
 569     _swrast_InvalidateState( ctx, new_state );
 570     _swsetup_InvalidateState( ctx, new_state );
 571     _vbo_InvalidateState( ctx, new_state );
 572     _tnl_InvalidateState( ctx, new_state );
 573 }
 574
 575 static void
 576 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 577 {
 578     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 579     GLframebuffer *read = ctx->WinSysReadBuffer;
 580
 581     swrast_check_and_update_window_size(ctx, draw);
 582     swrast_check_and_update_window_size(ctx, read);
 583 }
 584
 585 static void
 586 swrast_init_driver_functions(struct dd_function_table *driver)
 587 {
 588     driver->GetString = get_string;
 589     driver->UpdateState = update_state;
 590     driver->GetBufferSize = NULL;
 591     driver->Viewport = viewport;
 592 }
 593
 594
 595 /**
 596  * Context-related functions.
 597  */
 598
 599 static __DRIcontext *
 600 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 601                     __DRIcontext *shared, void *data)
 602 {
 603     __DRIcontext *ctx;
 604     GLcontext *mesaCtx;
 605     struct dd_function_table functions;
 606
 607     TRACE;
 608
 609     ctx = _mesa_calloc(sizeof *ctx);
 610     if (!ctx)
 611         return NULL;
 612
 613     ctx->loaderPrivate = data;
 614
 615     ctx->driScreenPriv = screen;
 616
 617     /* build table of device driver functions */
 618     _mesa_init_driver_functions(&functions);
 619     swrast_init_driver_functions(&functions);
 620
 621     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 622                                   shared ? &shared->Base : NULL,
 623                                   &functions, (void *) ctx)) {
 624       _mesa_free(ctx);
 625       return NULL;
 626     }
 627
 628     mesaCtx = &ctx->Base;
 629
 630     /* do bounds checking to prevent segfaults and server crashes! */
 631     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 632
 633     /* create module contexts */
 634     _swrast_CreateContext( mesaCtx );
 635     _vbo_CreateContext( mesaCtx );
 636     _tnl_CreateContext( mesaCtx );
 637     _swsetup_CreateContext( mesaCtx );
 638     _swsetup_Wakeup( mesaCtx );
 639
 640     /* use default TCL pipeline */
 641     {
 642        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 643        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 644     }
 645
 646     _mesa_enable_sw_extensions(mesaCtx);
 647     _mesa_enable_1_3_extensions(mesaCtx);
 648     _mesa_enable_1_4_extensions(mesaCtx);
 649     _mesa_enable_1_5_extensions(mesaCtx);
 650     _mesa_enable_2_0_extensions(mesaCtx);
 651     _mesa_enable_2_1_extensions(mesaCtx);
 652
 653     _mesa_meta_init(mesaCtx);
 654
 655     return ctx;
 656 }
 657
 658 static void
 659 driDestroyContext(__DRIcontext *ctx)
 660 {
 661     GLcontext *mesaCtx;
 662     TRACE;
 663
 664     if (ctx) {
 665         mesaCtx = &ctx->Base;
 666         _mesa_meta_free(mesaCtx);
 667         _swsetup_DestroyContext( mesaCtx );
 668         _swrast_DestroyContext( mesaCtx );
 669         _tnl_DestroyContext( mesaCtx );
 670         _vbo_DestroyContext( mesaCtx );
 671         _mesa_destroy_context( mesaCtx );
 672     }
 673 }
 674
 675 static int
 676 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 677 {
 678     TRACE;
 679
 680     _mesa_copy_context(&src->Base, &dst->Base, mask);
 681     return GL_TRUE;
 682 }
 683
 684 static int driBindContext(__DRIcontext *ctx,
 685                           __DRIdrawable *draw,
 686                           __DRIdrawable *read)
 687 {
 688     GLcontext *mesaCtx;
 689     GLframebuffer *mesaDraw;
 690     GLframebuffer *mesaRead;
 691     TRACE;
 692
 693     if (ctx) {
 694         if (!draw || !read)
 695             return GL_FALSE;
 696
 697         mesaCtx = &ctx->Base;
 698         mesaDraw = &draw->Base;
 699         mesaRead = &read->Base;
 700
 701         /* check for same context and buffer */
 702         if (mesaCtx == _mesa_get_current_context()
 703             && mesaCtx->DrawBuffer == mesaDraw
 704             && mesaCtx->ReadBuffer == mesaRead) {
 705             return GL_TRUE;
 706         }
 707
 708         _glapi_check_multithread();
 709
 710         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 711         if (read != draw)
 712             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 713
 714         _mesa_make_current( mesaCtx,
 715                             mesaDraw,
 716                             mesaRead );
 717     }
 718     else {
 719         /* unbind */
 720         _mesa_make_current( NULL, NULL, NULL );
 721     }
 722
 723     return GL_TRUE;
 724 }
 725
 726 static int driUnbindContext(__DRIcontext *ctx)
 727 {
 728     TRACE;
 729     (void) ctx;
 730     return GL_TRUE;
 731 }
 732
 733
 734 static const __DRIcoreExtension driCoreExtension = {
 735     { __DRI_CORE, __DRI_CORE_VERSION },
 736     NULL, /* driCreateNewScreen */
 737     driDestroyScreen,
 738     driGetExtensions,
 739     driGetConfigAttrib,
 740     driIndexConfigAttrib,
 741     NULL, /* driCreateNewDrawable */
 742     driDestroyDrawable,
 743     driSwapBuffers,
 744     driCreateNewContext,
 745     driCopyContext,
 746     driDestroyContext,
 747     driBindContext,
 748     driUnbindContext
 749 };
 750
 751 static const __DRIswrastExtension driSWRastExtension = {
 752     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 753     driCreateNewScreen,
 754     driCreateNewDrawable
 755 };
 756
 757 /* This is the table of extensions that the loader will dlsym() for. */
 758 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 759     &driCoreExtension.base,
 760     &driSWRastExtension.base,
 761     NULL
 762 };