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