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