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 "context.h"
  35 #include "extensions.h"
  36 #include "framebuffer.h"
  37 #include "imports.h"
  38 #include "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
  47 #include "swrast_priv.h"
  48
  49
  50 #define need_GL_VERSION_1_3
  51 #define need_GL_VERSION_1_4
  52 #define need_GL_VERSION_1_5
  53 #define need_GL_VERSION_2_0
  54
  55 /* sw extensions for imaging */
  56 #define need_GL_EXT_blend_color
  57 #define need_GL_EXT_blend_minmax
  58 #define need_GL_EXT_convolution
  59 #define need_GL_EXT_histogram
  60 #define need_GL_SGI_color_table
  61
  62 /* sw extensions not associated with some GL version */
  63 #define need_GL_ARB_shader_objects
  64 #define need_GL_ARB_vertex_program
  65 #define need_GL_APPLE_vertex_array_object
  66 #define need_GL_ATI_fragment_shader
  67 #define need_GL_EXT_depth_bounds_test
  68 #define need_GL_EXT_framebuffer_object
  69 #define need_GL_EXT_framebuffer_blit
  70 #define need_GL_EXT_gpu_program_parameters
  71 #define need_GL_EXT_paletted_texture
  72 #define need_GL_IBM_multimode_draw_arrays
  73 #define need_GL_MESA_resize_buffers
  74 #define need_GL_NV_vertex_program
  75 #define need_GL_NV_fragment_program
  76
  77 #include "extension_helper.h"
  78 #include "utils.h"
  79
  80 const struct dri_extension card_extensions[] =
  81 {
  82     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  83     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  84     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  85     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  86
  87     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  88     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  89     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  90     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  91     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  92
  93     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
  94     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
  95     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
  96     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
  97     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
  98     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
  99     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 100     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 101     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 102     { "GL_IBM_multimode_draw_arrays",   GL_IBM_multimode_draw_arrays_functions },
 103     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 104     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 105     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 106     { NULL,                             NULL }
 107 };
 108
 109
 110 /**
 111  * Screen and config-related functions
 112  */
 113
 114 static void
 115 setupLoaderExtensions(__DRIscreen *psp,
 116                       const __DRIextension **extensions)
 117 {
 118     int i;
 119
 120     for (i = 0; extensions[i]; i++) {
 121         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 122             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 123     }
 124 }
 125
 126 static __DRIconfig **
 127 swrastFillInModes(__DRIscreen *psp,
 128                   unsigned pixel_bits, unsigned depth_bits,
 129                   unsigned stencil_bits, GLboolean have_back_buffer)
 130 {
 131     __DRIconfig **configs;
 132     unsigned depth_buffer_factor;
 133     unsigned back_buffer_factor;
 134     GLenum fb_format;
 135     GLenum fb_type;
 136
 137     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 138      * support pageflipping at all.
 139      */
 140     static const GLenum back_buffer_modes[] = {
 141         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 142     };
 143
 144     u_int8_t depth_bits_array[4];
 145     u_int8_t stencil_bits_array[4];
 146
 147     depth_bits_array[0] = 0;
 148     depth_bits_array[1] = 0;
 149     depth_bits_array[2] = depth_bits;
 150     depth_bits_array[3] = depth_bits;
 151
 152     /* Just like with the accumulation buffer, always provide some modes
 153      * with a stencil buffer.
 154      */
 155     stencil_bits_array[0] = 0;
 156     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 157     stencil_bits_array[2] = 0;
 158     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 159
 160     depth_buffer_factor = 4;
 161     back_buffer_factor = 2;
 162
 163     if (pixel_bits == 8) {
 164         fb_format = GL_RGB;
 165         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 166     }
 167     else if (pixel_bits == 16) {
 168         fb_format = GL_RGB;
 169         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 170     }
 171     else {
 172         fb_format = GL_BGRA;
 173         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 174     }
 175
 176     configs = driCreateConfigs(fb_format, fb_type,
 177                                depth_bits_array, stencil_bits_array,
 178                                depth_buffer_factor, back_buffer_modes,
 179                                back_buffer_factor);
 180     if (configs == NULL) {
 181         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 182                 __LINE__);
 183         return NULL;
 184     }
 185
 186     return configs;
 187 }
 188
 189 static __DRIscreen *
 190 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 191                    const __DRIconfig ***driver_configs, void *data)
 192 {
 193     static const __DRIextension *emptyExtensionList[] = { NULL };
 194     __DRIscreen *psp;
 195     __DRIconfig **configs8, **configs16, **configs32;
 196
 197     (void) data;
 198
 199     TRACE;
 200
 201     psp = _mesa_calloc(sizeof(*psp));
 202     if (!psp)
 203         return NULL;
 204
 205     setupLoaderExtensions(psp, extensions);
 206
 207     psp->num = scrn;
 208     psp->extensions = emptyExtensionList;
 209
 210     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 211     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 212     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 213
 214     configs16 = (__DRIconfig **)driConcatConfigs(configs8, configs16);
 215
 216     *driver_configs = driConcatConfigs(configs16, configs32);
 217
 218     driInitExtensions( NULL, card_extensions, GL_FALSE );
 219
 220     return psp;
 221 }
 222
 223 static void driDestroyScreen(__DRIscreen *psp)
 224 {
 225     TRACE;
 226
 227     if (psp) {
 228         _mesa_free(psp);
 229     }
 230 }
 231
 232 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 233 {
 234     TRACE;
 235
 236     return psp->extensions;
 237 }
 238
 239
 240 /**
 241  * Framebuffer and renderbuffer-related functions.
 242  */
 243
 244 static GLuint
 245 choose_pixel_format(const GLvisual *v)
 246 {
 247     if (v->rgbMode) {
 248         int bpp = v->rgbBits;
 249
 250         if (bpp == 32
 251             && v->redMask   == 0xff0000
 252             && v->greenMask == 0x00ff00
 253             && v->blueMask  == 0x0000ff)
 254             return PF_A8R8G8B8;
 255         else if (bpp == 16
 256             && v->redMask   == 0xf800
 257             && v->greenMask == 0x07e0
 258             && v->blueMask  == 0x001f)
 259             return PF_R5G6B5;
 260         else if (bpp == 8
 261             && v->redMask   == 0x07
 262             && v->greenMask == 0x38
 263             && v->blueMask  == 0xc0)
 264             return PF_R3G3B2;
 265     }
 266     else {
 267         if (v->indexBits == 8)
 268             return PF_CI8;
 269     }
 270
 271     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 272     return 0;
 273 }
 274
 275 static void
 276 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 277 {
 278     TRACE;
 279
 280     _mesa_free(rb->Data);
 281     _mesa_free(rb);
 282 }
 283
 284 static GLboolean
 285 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 286                            GLenum internalFormat, GLuint width, GLuint height)
 287 {
 288     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 289     int bpp;
 290     unsigned mask = PITCH_ALIGN_BITS - 1;
 291
 292     TRACE;
 293
 294     rb->Data = NULL;
 295     rb->Width = width;
 296     rb->Height = height;
 297
 298     switch (internalFormat) {
 299     case GL_RGB:
 300         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits;
 301         break;
 302     case GL_RGBA:
 303         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits + rb->AlphaBits;
 304         break;
 305     case GL_COLOR_INDEX8_EXT:
 306         bpp = rb->IndexBits;
 307         break;
 308     default:
 309         _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 310         return GL_FALSE;
 311     }
 312
 313     /* always pad to PITCH_ALIGN_BITS */
 314     xrb->pitch = ((width * bpp + mask) & ~mask) / 8;
 315
 316     return GL_TRUE;
 317 }
 318
 319 static GLboolean
 320 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 321                           GLenum internalFormat, GLuint width, GLuint height)
 322 {
 323     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 324
 325     TRACE;
 326
 327     _mesa_free(rb->Data);
 328
 329     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 330
 331     rb->Data = _mesa_malloc(height * xrb->pitch);
 332
 333     return GL_TRUE;
 334 }
 335
 336 static struct swrast_renderbuffer *
 337 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 338 {
 339     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 340     GLuint pixel_format;
 341
 342     TRACE;
 343
 344     if (!xrb)
 345         return NULL;
 346
 347     _mesa_init_renderbuffer(&xrb->Base, 0);
 348
 349     pixel_format = choose_pixel_format(visual);
 350
 351     xrb->Base.Delete = swrast_delete_renderbuffer;
 352     if (front) {
 353         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 354         swrast_set_span_funcs_front(xrb, pixel_format);
 355     }
 356     else {
 357         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 358         swrast_set_span_funcs_back(xrb, pixel_format);
 359     }
 360
 361     switch (pixel_format) {
 362     case PF_A8R8G8B8:
 363         xrb->Base.InternalFormat = GL_RGBA;
 364         xrb->Base._BaseFormat = GL_RGBA;
 365         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 366         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 367         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 368         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 369         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 370         break;
 371     case PF_R5G6B5:
 372         xrb->Base.InternalFormat = GL_RGB;
 373         xrb->Base._BaseFormat = GL_RGB;
 374         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 375         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 376         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 377         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 378         xrb->Base.AlphaBits = 0;
 379         break;
 380     case PF_R3G3B2:
 381         xrb->Base.InternalFormat = GL_RGB;
 382         xrb->Base._BaseFormat = GL_RGB;
 383         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 384         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 385         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 386         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 387         xrb->Base.AlphaBits = 0;
 388         break;
 389     case PF_CI8:
 390         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 391         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 392         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 393         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 394         break;
 395     default:
 396         return NULL;
 397     }
 398
 399     return xrb;
 400 }
 401
 402 static __DRIdrawable *
 403 driCreateNewDrawable(__DRIscreen *screen,
 404                      const __DRIconfig *config, void *data)
 405 {
 406     __DRIdrawable *buf;
 407     struct swrast_renderbuffer *frontrb, *backrb;
 408
 409     TRACE;
 410
 411     buf = _mesa_calloc(sizeof *buf);
 412     if (!buf)
 413         return NULL;
 414
 415     buf->loaderPrivate = data;
 416
 417     buf->driScreenPriv = screen;
 418
 419     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 420
 421     /* basic framebuffer setup */
 422     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 423
 424     /* add front renderbuffer */
 425     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 426     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 427
 428     /* add back renderbuffer */
 429     if (config->modes.doubleBufferMode) {
 430         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 431         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 432     }
 433
 434     /* add software renderbuffers */
 435     _mesa_add_soft_renderbuffers(&buf->Base,
 436                                  GL_FALSE, /* color */
 437                                  config->modes.haveDepthBuffer,
 438                                  config->modes.haveStencilBuffer,
 439                                  config->modes.haveAccumBuffer,
 440                                  GL_FALSE, /* alpha */
 441                                  GL_FALSE /* aux bufs */);
 442
 443     return buf;
 444 }
 445
 446 static void
 447 driDestroyDrawable(__DRIdrawable *buf)
 448 {
 449     TRACE;
 450
 451     if (buf) {
 452         struct gl_framebuffer *fb = &buf->Base;
 453
 454         _mesa_free(buf->row);
 455
 456         fb->DeletePending = GL_TRUE;
 457         _mesa_unreference_framebuffer(&fb);
 458     }
 459 }
 460
 461 static void driSwapBuffers(__DRIdrawable *buf)
 462 {
 463     GET_CURRENT_CONTEXT(ctx);
 464
 465     struct swrast_renderbuffer *frontrb =
 466         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 467     struct swrast_renderbuffer *backrb =
 468         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 469
 470     __DRIscreen *screen = buf->driScreenPriv;
 471
 472     TRACE;
 473
 474     /* check for signle-buffered */
 475     if (backrb == NULL)
 476         return;
 477
 478     /* check if swapping currently bound buffer */
 479     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 480         /* flush pending rendering */
 481         _mesa_notifySwapBuffers(ctx);
 482     }
 483
 484     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 485                                     0, 0,
 486                                     frontrb->Base.Width,
 487                                     frontrb->Base.Height,
 488                                     backrb->Base.Data,
 489                                     buf->loaderPrivate);
 490 }
 491
 492
 493 /**
 494  * General device driver functions.
 495  */
 496
 497 static void
 498 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 499 {
 500     __DRIdrawable *buf = swrast_drawable(fb);
 501     __DRIscreen *screen = buf->driScreenPriv;
 502     int x, y;
 503
 504     screen->swrast_loader->getDrawableInfo(buf,
 505                                            &x, &y, w, h,
 506                                            buf->loaderPrivate);
 507 }
 508
 509 static void
 510 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 511 {
 512     GLsizei width, height;
 513
 514     get_window_size(fb, &width, &height);
 515     if (fb->Width != width || fb->Height != height) {
 516         _mesa_resize_framebuffer(ctx, fb, width, height);
 517     }
 518 }
 519
 520 static const GLubyte *
 521 get_string(GLcontext *ctx, GLenum pname)
 522 {
 523     (void) ctx;
 524     switch (pname) {
 525         case GL_VENDOR:
 526             return (const GLubyte *) "Mesa Project";
 527         case GL_RENDERER:
 528             return (const GLubyte *) "Software Rasterizer";
 529         default:
 530             return NULL;
 531     }
 532 }
 533
 534 static void
 535 update_state( GLcontext *ctx, GLuint new_state )
 536 {
 537     /* not much to do here - pass it on */
 538     _swrast_InvalidateState( ctx, new_state );
 539     _swsetup_InvalidateState( ctx, new_state );
 540     _vbo_InvalidateState( ctx, new_state );
 541     _tnl_InvalidateState( ctx, new_state );
 542 }
 543
 544 static void
 545 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 546 {
 547     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 548     GLframebuffer *read = ctx->WinSysReadBuffer;
 549
 550     swrast_check_and_update_window_size(ctx, draw);
 551     swrast_check_and_update_window_size(ctx, read);
 552 }
 553
 554 static void
 555 swrast_init_driver_functions(struct dd_function_table *driver)
 556 {
 557     driver->GetString = get_string;
 558     driver->UpdateState = update_state;
 559     driver->GetBufferSize = NULL;
 560     driver->Viewport = viewport;
 561 }
 562
 563
 564 /**
 565  * Context-related functions.
 566  */
 567
 568 static __DRIcontext *
 569 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 570                     __DRIcontext *shared, void *data)
 571 {
 572     __DRIcontext *ctx;
 573     GLcontext *mesaCtx;
 574     struct dd_function_table functions;
 575
 576     TRACE;
 577
 578     ctx = _mesa_calloc(sizeof *ctx);
 579     if (!ctx)
 580         return NULL;
 581
 582     ctx->loaderPrivate = data;
 583
 584     ctx->driScreenPriv = screen;
 585
 586     /* build table of device driver functions */
 587     _mesa_init_driver_functions(&functions);
 588     swrast_init_driver_functions(&functions);
 589
 590     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 591                                   shared ? &shared->Base : NULL,
 592                                   &functions, (void *) ctx)) {
 593       _mesa_free(ctx);
 594       return NULL;
 595     }
 596
 597     mesaCtx = &ctx->Base;
 598
 599     /* do bounds checking to prevent segfaults and server crashes! */
 600     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 601
 602     /* create module contexts */
 603     _swrast_CreateContext( mesaCtx );
 604     _vbo_CreateContext( mesaCtx );
 605     _tnl_CreateContext( mesaCtx );
 606     _swsetup_CreateContext( mesaCtx );
 607     _swsetup_Wakeup( mesaCtx );
 608
 609     /* use default TCL pipeline */
 610     {
 611        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 612        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 613     }
 614
 615     _mesa_enable_sw_extensions(mesaCtx);
 616     _mesa_enable_1_3_extensions(mesaCtx);
 617     _mesa_enable_1_4_extensions(mesaCtx);
 618     _mesa_enable_1_5_extensions(mesaCtx);
 619     _mesa_enable_2_0_extensions(mesaCtx);
 620     _mesa_enable_2_1_extensions(mesaCtx);
 621
 622     return ctx;
 623 }
 624
 625 static void
 626 driDestroyContext(__DRIcontext *ctx)
 627 {
 628     GLcontext *mesaCtx;
 629     TRACE;
 630
 631     if (ctx) {
 632         mesaCtx = &ctx->Base;
 633         _swsetup_DestroyContext( mesaCtx );
 634         _swrast_DestroyContext( mesaCtx );
 635         _tnl_DestroyContext( mesaCtx );
 636         _vbo_DestroyContext( mesaCtx );
 637         _mesa_destroy_context( mesaCtx );
 638     }
 639 }
 640
 641 static int
 642 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 643 {
 644     TRACE;
 645
 646     _mesa_copy_context(&src->Base, &dst->Base, mask);
 647     return GL_TRUE;
 648 }
 649
 650 static int driBindContext(__DRIcontext *ctx,
 651                           __DRIdrawable *draw,
 652                           __DRIdrawable *read)
 653 {
 654     GLcontext *mesaCtx;
 655     GLframebuffer *mesaDraw;
 656     GLframebuffer *mesaRead;
 657     TRACE;
 658
 659     if (ctx) {
 660         if (!draw || !read)
 661             return GL_FALSE;
 662
 663         mesaCtx = &ctx->Base;
 664         mesaDraw = &draw->Base;
 665         mesaRead = &read->Base;
 666
 667         /* check for same context and buffer */
 668         if (mesaCtx == _mesa_get_current_context()
 669             && mesaCtx->DrawBuffer == mesaDraw
 670             && mesaCtx->ReadBuffer == mesaRead) {
 671             return GL_TRUE;
 672         }
 673
 674         _glapi_check_multithread();
 675
 676         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 677         if (read != draw)
 678             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 679
 680         _mesa_make_current( mesaCtx,
 681                             mesaDraw,
 682                             mesaRead );
 683     }
 684     else {
 685         /* unbind */
 686         _mesa_make_current( NULL, NULL, NULL );
 687     }
 688
 689     return GL_TRUE;
 690 }
 691
 692 static int driUnbindContext(__DRIcontext *ctx)
 693 {
 694     TRACE;
 695     (void) ctx;
 696     _mesa_make_current(NULL, NULL, NULL);
 697     return GL_TRUE;
 698 }
 699
 700
 701 static const __DRIcoreExtension driCoreExtension = {
 702     { __DRI_CORE, __DRI_CORE_VERSION },
 703     NULL, /* driCreateNewScreen */
 704     driDestroyScreen,
 705     driGetExtensions,
 706     driGetConfigAttrib,
 707     driIndexConfigAttrib,
 708     NULL, /* driCreateNewDrawable */
 709     driDestroyDrawable,
 710     driSwapBuffers,
 711     driCreateNewContext,
 712     driCopyContext,
 713     driDestroyContext,
 714     driBindContext,
 715     driUnbindContext
 716 };
 717
 718 static const __DRIswrastExtension driSWRastExtension = {
 719     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 720     driCreateNewScreen,
 721     driCreateNewDrawable
 722 };
 723
 724 /* This is the table of extensions that the loader will dlsym() for. */
 725 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 726     &driCoreExtension.base,
 727     &driSWRastExtension.base,
 728     NULL
 729 };