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