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 #include <GL/gl.h>
  23 #include <GL/internal/dri_interface.h>
  24 #include "context.h"
  25 #include "extensions.h"
  26 #include "framebuffer.h"
  27 #include "imports.h"
  28 #include "renderbuffer.h"
  29 #include "swrast/swrast.h"
  30 #include "swrast_setup/swrast_setup.h"
  31 #include "tnl/tnl.h"
  32 #include "tnl/t_context.h"
  33 #include "tnl/t_pipeline.h"
  34 #include "vbo/vbo.h"
  35 #include "drivers/common/driverfuncs.h"
  36
  37 #include "swrast_priv.h"
  38
  39
  40 #define need_GL_VERSION_1_3
  41 #define need_GL_VERSION_1_4
  42 #define need_GL_VERSION_1_5
  43 #define need_GL_VERSION_2_0
  44
  45 /* sw extensions for imaging */
  46 #define need_GL_EXT_blend_color
  47 #define need_GL_EXT_blend_minmax
  48 #define need_GL_EXT_convolution
  49 #define need_GL_EXT_histogram
  50 #define need_GL_SGI_color_table
  51
  52 /* sw extensions not associated with some GL version */
  53 #define need_GL_ARB_shader_objects
  54 #define need_GL_ARB_vertex_program
  55 #define need_GL_APPLE_vertex_array_object
  56 #define need_GL_ATI_fragment_shader
  57 #define need_GL_EXT_depth_bounds_test
  58 #define need_GL_EXT_framebuffer_object
  59 #define need_GL_EXT_framebuffer_blit
  60 #define need_GL_EXT_gpu_program_parameters
  61 #define need_GL_EXT_paletted_texture
  62 #define need_GL_IBM_multimode_draw_arrays
  63 #define need_GL_MESA_resize_buffers
  64 #define need_GL_NV_vertex_program
  65 #define need_GL_NV_fragment_program
  66
  67 #include "extension_helper.h"
  68 #include "utils.h"
  69
  70 const struct dri_extension card_extensions[] =
  71 {
  72     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  73     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  74     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  75     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  76
  77     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  78     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  79     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  80     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  81     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  82
  83     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
  84     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
  85     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
  86     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
  87     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
  88     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
  89     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
  90     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
  91     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
  92     { "GL_IBM_multimode_draw_arrays",   GL_IBM_multimode_draw_arrays_functions },
  93     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
  94     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
  95     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
  96     { NULL,                             NULL }
  97 };
  98
  99 static void
 100 setupLoaderExtensions(__DRIscreen *psp,
 101                       const __DRIextension **extensions)
 102 {
 103     int i;
 104
 105     for (i = 0; extensions[i]; i++) {
 106         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 107             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 108     }
 109 }
 110
 111 static __DRIconfig **
 112 swrastFillInModes(__DRIscreen *psp,
 113                   unsigned pixel_bits, unsigned depth_bits,
 114                   unsigned stencil_bits, GLboolean have_back_buffer)
 115 {
 116     __DRIconfig **configs;
 117     unsigned depth_buffer_factor;
 118     unsigned back_buffer_factor;
 119     GLenum fb_format;
 120     GLenum fb_type;
 121
 122     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 123      * support pageflipping at all.
 124      */
 125     static const GLenum back_buffer_modes[] = {
 126         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 127     };
 128
 129     u_int8_t depth_bits_array[4];
 130     u_int8_t stencil_bits_array[4];
 131
 132     depth_bits_array[0] = 0;
 133     depth_bits_array[1] = 0;
 134     depth_bits_array[2] = depth_bits;
 135     depth_bits_array[3] = depth_bits;
 136
 137     /* Just like with the accumulation buffer, always provide some modes
 138      * with a stencil buffer.
 139      */
 140     stencil_bits_array[0] = 0;
 141     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 142     stencil_bits_array[2] = 0;
 143     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 144
 145     depth_buffer_factor = 4;
 146     back_buffer_factor = 2;
 147
 148     if (pixel_bits == 16) {
 149         fb_format = GL_RGB;
 150         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 151     }
 152     else {
 153         fb_format = GL_BGRA;
 154         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 155     }
 156
 157     configs = driCreateConfigs(fb_format, fb_type,
 158                                depth_bits_array, stencil_bits_array,
 159                                depth_buffer_factor, back_buffer_modes,
 160                                back_buffer_factor);
 161     if (configs == NULL) {
 162         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 163                 __LINE__);
 164         return NULL;
 165     }
 166
 167     return configs;
 168 }
 169
 170 static __DRIscreen *
 171 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 172                    const __DRIconfig ***driver_configs, void *data)
 173 {
 174     static const __DRIextension *emptyExtensionList[] = { NULL };
 175     __DRIscreen *psp;
 176
 177     (void) data;
 178
 179     TRACE;
 180
 181     psp = _mesa_calloc(sizeof(*psp));
 182     if (!psp)
 183         return NULL;
 184
 185     setupLoaderExtensions(psp, extensions);
 186
 187     psp->num = scrn;
 188     psp->extensions = emptyExtensionList;
 189
 190     *driver_configs = driConcatConfigs(swrastFillInModes(psp, 16, 16, 0, 1),
 191                                        swrastFillInModes(psp, 32, 24, 8, 1));
 192
 193     driInitExtensions( NULL, card_extensions, GL_FALSE );
 194
 195     return psp;
 196 }
 197
 198 static void driDestroyScreen(__DRIscreen *psp)
 199 {
 200     TRACE;
 201
 202     if (psp) {
 203         _mesa_free(psp);
 204     }
 205 }
 206
 207 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 208 {
 209     TRACE;
 210
 211     return psp->extensions;
 212 }
 213
 214
 215 /**
 216  * swrast_buffer.c
 217  */
 218
 219 static GLuint
 220 choose_pixel_format(const GLvisual *v)
 221 {
 222     if (v->rgbMode) {
 223         /* XXX 24bpp packed, 8bpp, xmesa gets bitsPerPixel from xserver */
 224         int bpp = v->rgbBits;
 225         if (bpp == 24)
 226             bpp = 32;
 227
 228         if (bpp == 32
 229             && v->redMask   == 0xff0000
 230             && v->greenMask == 0x00ff00
 231             && v->blueMask  == 0x0000ff)
 232             return PF_A8R8G8B8;
 233         else if (bpp == 16
 234             && v->redMask   == 0xf800
 235             && v->greenMask == 0x07e0
 236             && v->blueMask  == 0x001f)
 237             return PF_R5G6B5;
 238     }
 239     else {
 240         if (v->indexBits == 8)
 241             return PF_CI8;
 242     }
 243
 244     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 245     return 0;
 246 }
 247
 248 static void
 249 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 250 {
 251     TRACE;
 252
 253     _mesa_free(rb->Data);
 254     _mesa_free(rb);
 255 }
 256
 257 static GLboolean
 258 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 259                            GLenum internalFormat, GLuint width, GLuint height)
 260 {
 261     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 262     int bpp;
 263
 264     TRACE;
 265
 266     rb->Data = NULL;
 267     rb->Width = width;
 268     rb->Height = height;
 269
 270     switch (internalFormat) {
 271     case GL_RGB:
 272         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits;
 273         break;
 274     case GL_RGBA:
 275         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits + rb->AlphaBits;
 276         break;
 277     case GL_COLOR_INDEX8_EXT:
 278         bpp = rb->IndexBits;
 279         break;
 280     default:
 281         _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 282         return GL_FALSE;
 283     }
 284
 285     /* always pad to 32 bits */
 286     xrb->pitch = ((width * bpp + 0x1f) & ~0x1f) / 8;
 287
 288     return GL_TRUE;
 289 }
 290
 291 static GLboolean
 292 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 293                         GLenum internalFormat, GLuint width, GLuint height)
 294 {
 295     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 296
 297     TRACE;
 298
 299     _mesa_free(rb->Data);
 300
 301     (void) swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 302
 303     rb->Data = _mesa_malloc(height * xrb->pitch);
 304
 305     return GL_TRUE;
 306 }
 307
 308 static struct swrast_renderbuffer *
 309 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 310 {
 311     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 312     GLuint pixel_format;
 313
 314     TRACE;
 315
 316     if (xrb) {
 317         _mesa_init_renderbuffer(&xrb->Base, 0);
 318
 319         pixel_format = choose_pixel_format(visual);
 320
 321         xrb->Base.Delete = swrast_delete_renderbuffer;
 322         if (front) {
 323             xrb->Base.AllocStorage = swrast_alloc_front_storage;
 324             swrast_set_span_funcs_pixmap(xrb, pixel_format);
 325         }
 326         else {
 327             xrb->Base.AllocStorage = swrast_alloc_back_storage;
 328             swrast_set_span_funcs_ximage(xrb, pixel_format);
 329         }
 330
 331         switch (pixel_format) {
 332         case PF_A8R8G8B8:
 333             xrb->Base.InternalFormat = GL_RGBA;
 334             xrb->Base._BaseFormat = GL_RGBA;
 335             xrb->Base.DataType = GL_UNSIGNED_BYTE;
 336             xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 337             xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 338             xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 339             xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 340             break;
 341         case PF_R5G6B5:
 342             xrb->Base.InternalFormat = GL_RGB;
 343             xrb->Base._BaseFormat = GL_RGB;
 344             xrb->Base.DataType = GL_UNSIGNED_BYTE;
 345             xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 346             xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 347             xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 348             xrb->Base.AlphaBits = 0;
 349             break;
 350         case PF_CI8:
 351             xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 352             xrb->Base._BaseFormat = GL_COLOR_INDEX;
 353             xrb->Base.DataType = GL_UNSIGNED_BYTE;
 354             xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 355             break;
 356         default:
 357             return NULL;
 358         }
 359     }
 360     return xrb;
 361 }
 362
 363 static __DRIdrawable *
 364 driCreateNewDrawable(__DRIscreen *screen,
 365                      const __DRIconfig *config, void *data)
 366 {
 367     __DRIdrawable *buf;
 368     struct swrast_renderbuffer *frontrb, *backrb;
 369
 370     TRACE;
 371
 372     buf = _mesa_calloc(sizeof *buf);
 373     if (!buf)
 374         return NULL;
 375
 376     buf->loaderPrivate = data;
 377
 378     buf->driScreenPriv = screen;
 379
 380     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 381
 382     /* basic framebuffer setup */
 383     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 384
 385     /* add front renderbuffer */
 386     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 387     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 388
 389     /* add back renderbuffer */
 390     if (config->modes.doubleBufferMode) {
 391         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 392         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 393     }
 394
 395     /* add software renderbuffers */
 396     _mesa_add_soft_renderbuffers(&buf->Base,
 397                                  GL_FALSE, /* color */
 398                                  config->modes.haveDepthBuffer,
 399                                  config->modes.haveStencilBuffer,
 400                                  config->modes.haveAccumBuffer,
 401                                  GL_FALSE, /* alpha */
 402                                  GL_FALSE /* aux bufs */);
 403
 404     return buf;
 405 }
 406
 407 static void
 408 driDestroyDrawable(__DRIdrawable *buf)
 409 {
 410     TRACE;
 411
 412     if (buf) {
 413         struct gl_framebuffer *fb = &buf->Base;
 414
 415         _mesa_free(buf->row);
 416
 417         fb->DeletePending = GL_TRUE;
 418         _mesa_unreference_framebuffer(&fb);
 419     }
 420 }
 421
 422 static void driSwapBuffers(__DRIdrawable *buf)
 423 {
 424     GET_CURRENT_CONTEXT(ctx);
 425
 426     struct swrast_renderbuffer *frontrb =
 427         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 428     struct swrast_renderbuffer *backrb =
 429         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 430
 431     __DRIscreen *screen = buf->driScreenPriv;
 432
 433     TRACE;
 434
 435     /* check for signle-buffered */
 436     if (backrb == NULL)
 437         return;
 438
 439     /* check if swapping currently bound buffer */
 440     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 441         /* flush pending rendering */
 442         _mesa_notifySwapBuffers(ctx);
 443     }
 444
 445     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 446                                     0, 0,
 447                                     frontrb->Base.Width,
 448                                     frontrb->Base.Height,
 449                                     backrb->Base.Data,
 450                                     buf->loaderPrivate);
 451 }
 452
 453
 454 /**
 455  * swrast_dd.c
 456  */
 457
 458 static void
 459 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 460 {
 461     __DRIdrawable *buf = swrast_drawable(fb);
 462     __DRIscreen *screen = buf->driScreenPriv;
 463     int x, y;
 464
 465     screen->swrast_loader->getDrawableInfo(buf,
 466                                            &x, &y, w, h,
 467                                            buf->loaderPrivate);
 468 }
 469
 470 static void
 471 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 472 {
 473     GLsizei width, height;
 474
 475     get_window_size(fb, &width, &height);
 476     if (fb->Width != width || fb->Height != height) {
 477         _mesa_resize_framebuffer(ctx, fb, width, height);
 478     }
 479 }
 480
 481 static const GLubyte *
 482 get_string(GLcontext *ctx, GLenum pname)
 483 {
 484     (void) ctx;
 485     switch (pname) {
 486         case GL_VENDOR:
 487             return (const GLubyte *) "Mesa Project";
 488         case GL_RENDERER:
 489             return (const GLubyte *) "X.Org";
 490         default:
 491             return NULL;
 492     }
 493 }
 494
 495 static void
 496 update_state( GLcontext *ctx, GLuint new_state )
 497 {
 498     /* not much to do here - pass it on */
 499     _swrast_InvalidateState( ctx, new_state );
 500     _swsetup_InvalidateState( ctx, new_state );
 501     _vbo_InvalidateState( ctx, new_state );
 502     _tnl_InvalidateState( ctx, new_state );
 503 }
 504
 505 static void
 506 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 507 {
 508     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 509     GLframebuffer *read = ctx->WinSysReadBuffer;
 510
 511     swrast_check_and_update_window_size(ctx, draw);
 512     swrast_check_and_update_window_size(ctx, read);
 513 }
 514
 515 static void
 516 swrast_init_driver_functions(struct dd_function_table *driver)
 517 {
 518     driver->GetString = get_string;
 519     driver->UpdateState = update_state;
 520     driver->GetBufferSize = NULL;
 521     driver->Viewport = viewport;
 522 }
 523
 524
 525 /**
 526  * swrast_context.c
 527  */
 528
 529 static __DRIcontext *
 530 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 531                     __DRIcontext *shared, void *data)
 532 {
 533     __DRIcontext *ctx;
 534     GLcontext *mesaCtx;
 535     struct dd_function_table functions;
 536
 537     TRACE;
 538
 539     ctx = _mesa_calloc(sizeof *ctx);
 540     if (!ctx)
 541         return NULL;
 542
 543     ctx->loaderPrivate = data;
 544
 545     ctx->driScreenPriv = screen;
 546
 547     /* build table of device driver functions */
 548     _mesa_init_driver_functions(&functions);
 549     swrast_init_driver_functions(&functions);
 550
 551     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 552                                   shared ? &shared->Base : NULL,
 553                                   &functions, (void *) ctx)) {
 554       _mesa_free(ctx);
 555       return NULL;
 556     }
 557
 558     mesaCtx = &ctx->Base;
 559
 560     /* do bounds checking to prevent segfaults and server crashes! */
 561     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 562
 563     /* create module contexts */
 564     _swrast_CreateContext( mesaCtx );
 565     _vbo_CreateContext( mesaCtx );
 566     _tnl_CreateContext( mesaCtx );
 567     _swsetup_CreateContext( mesaCtx );
 568     _swsetup_Wakeup( mesaCtx );
 569
 570     /* use default TCL pipeline */
 571     {
 572        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 573        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 574     }
 575
 576     _mesa_enable_sw_extensions(mesaCtx);
 577     _mesa_enable_1_3_extensions(mesaCtx);
 578     _mesa_enable_1_4_extensions(mesaCtx);
 579     _mesa_enable_1_5_extensions(mesaCtx);
 580     _mesa_enable_2_0_extensions(mesaCtx);
 581     _mesa_enable_2_1_extensions(mesaCtx);
 582
 583     return ctx;
 584 }
 585
 586 static void
 587 driDestroyContext(__DRIcontext *ctx)
 588 {
 589     GLcontext *mesaCtx;
 590     TRACE;
 591
 592     if (ctx) {
 593         mesaCtx = &ctx->Base;
 594         _swsetup_DestroyContext( mesaCtx );
 595         _swrast_DestroyContext( mesaCtx );
 596         _tnl_DestroyContext( mesaCtx );
 597         _vbo_DestroyContext( mesaCtx );
 598         _mesa_destroy_context( mesaCtx );
 599     }
 600 }
 601
 602 static int
 603 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 604 {
 605     TRACE;
 606
 607     _mesa_copy_context(&src->Base, &dst->Base, mask);
 608     return GL_TRUE;
 609 }
 610
 611 static int driBindContext(__DRIcontext *ctx,
 612                           __DRIdrawable *draw,
 613                           __DRIdrawable *read)
 614 {
 615     GLcontext *mesaCtx;
 616     GLframebuffer *mesaDraw;
 617     GLframebuffer *mesaRead;
 618     TRACE;
 619
 620     if (ctx) {
 621         if (!draw || !read)
 622             return GL_FALSE;
 623
 624         /* check for same context and buffer */
 625         mesaCtx = &ctx->Base;
 626         mesaDraw = &draw->Base;
 627         mesaRead = &read->Base;
 628         if (mesaCtx == _mesa_get_current_context()
 629             && mesaCtx->DrawBuffer == mesaDraw
 630             && mesaCtx->ReadBuffer == mesaRead) {
 631             return GL_TRUE;
 632         }
 633
 634         _glapi_check_multithread();
 635
 636         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 637         if (read != draw)
 638             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 639
 640         _mesa_make_current( mesaCtx,
 641                             mesaDraw,
 642                             mesaRead );
 643     }
 644     else {
 645         /* unbind */
 646         _mesa_make_current( NULL, NULL, NULL );
 647     }
 648
 649     return GL_TRUE;
 650 }
 651
 652 static int driUnbindContext(__DRIcontext *ctx)
 653 {
 654     TRACE;
 655     (void) ctx;
 656     _mesa_make_current(NULL, NULL, NULL);
 657     return GL_TRUE;
 658 }
 659
 660
 661 static const __DRIcoreExtension driCoreExtension = {
 662     { __DRI_CORE, __DRI_CORE_VERSION },
 663     NULL,
 664     driDestroyScreen,
 665     driGetExtensions,
 666     driGetConfigAttrib,
 667     driIndexConfigAttrib,
 668     NULL,
 669     driDestroyDrawable,
 670     driSwapBuffers,
 671     driCreateNewContext,
 672     driCopyContext,
 673     driDestroyContext,
 674     driBindContext,
 675     driUnbindContext
 676 };
 677
 678 static const __DRIswrastExtension driSWRastExtension = {
 679     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 680     driCreateNewScreen,
 681     driCreateNewDrawable,
 682 };
 683
 684 /* This is the table of extensions that the loader will dlsym() for. */
 685 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 686     &driCoreExtension.base,
 687     &driSWRastExtension.base,
 688     NULL
 689 };