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 "drivers/common/meta.h"
  47 #include "utils.h"
  48
  49 #include "swrast_priv.h"
  50
  51
  52 #define need_GL_VERSION_1_3
  53 #define need_GL_VERSION_1_4
  54 #define need_GL_VERSION_1_5
  55 #define need_GL_VERSION_2_0
  56 #define need_GL_VERSION_2_1
  57
  58 /* sw extensions for imaging */
  59 #define need_GL_EXT_blend_color
  60 #define need_GL_EXT_blend_minmax
  61 #define need_GL_EXT_convolution
  62 #define need_GL_EXT_histogram
  63 #define need_GL_SGI_color_table
  64
  65 /* sw extensions not associated with some GL version */
  66 #define need_GL_ARB_draw_elements_base_vertex
  67 #define need_GL_ARB_shader_objects
  68 #define need_GL_ARB_vertex_array_object
  69 #define need_GL_ARB_vertex_program
  70 #define need_GL_ARB_sync
  71 #define need_GL_APPLE_vertex_array_object
  72 #define need_GL_ATI_fragment_shader
  73 #define need_GL_ATI_separate_stencil
  74 #define need_GL_EXT_depth_bounds_test
  75 #define need_GL_EXT_framebuffer_object
  76 #define need_GL_EXT_framebuffer_blit
  77 #define need_GL_EXT_gpu_program_parameters
  78 #define need_GL_EXT_paletted_texture
  79 #define need_GL_EXT_stencil_two_side
  80 #define need_GL_MESA_resize_buffers
  81 #define need_GL_NV_vertex_program
  82 #define need_GL_NV_fragment_program
  83
  84 #include "extension_helper.h"
  85
  86 const struct dri_extension card_extensions[] =
  87 {
  88     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  89     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  90     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  91     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  92     { "GL_VERSION_2_1",                 GL_VERSION_2_1_functions },
  93
  94     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  95     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  96     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  97     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  98     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  99
 100     { "GL_ARB_depth_clamp",             NULL },
 101     { "GL_ARB_draw_elements_base_vertex", GL_ARB_draw_elements_base_vertex_functions },
 102     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
 103     { "GL_ARB_vertex_array_object",     GL_ARB_vertex_array_object_functions },
 104     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
 105     { "GL_ARB_sync",                    GL_ARB_sync_functions },
 106     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
 107     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
 108     { "GL_ATI_separate_stencil",        GL_ATI_separate_stencil_functions },
 109     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
 110     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
 111     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 112     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 113     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 114     { "GL_EXT_stencil_two_side",        GL_EXT_stencil_two_side_functions },
 115     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 116     { "GL_NV_depth_clamp",              NULL },
 117     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 118     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 119     { "GL_NV_fragment_program_option",  NULL },
 120     { NULL,                             NULL }
 121 };
 122
 123
 124 /**
 125  * Screen and config-related functions
 126  */
 127
 128 static void
 129 setupLoaderExtensions(__DRIscreen *psp,
 130                       const __DRIextension **extensions)
 131 {
 132     int i;
 133
 134     for (i = 0; extensions[i]; i++) {
 135         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 136             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 137     }
 138 }
 139
 140 static __DRIconfig **
 141 swrastFillInModes(__DRIscreen *psp,
 142                   unsigned pixel_bits, unsigned depth_bits,
 143                   unsigned stencil_bits, GLboolean have_back_buffer)
 144 {
 145     __DRIconfig **configs;
 146     unsigned depth_buffer_factor;
 147     unsigned back_buffer_factor;
 148     GLenum fb_format;
 149     GLenum fb_type;
 150
 151     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 152      * support pageflipping at all.
 153      */
 154     static const GLenum back_buffer_modes[] = {
 155         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 156     };
 157
 158     uint8_t depth_bits_array[4];
 159     uint8_t stencil_bits_array[4];
 160     uint8_t msaa_samples_array[1];
 161
 162     depth_bits_array[0] = 0;
 163     depth_bits_array[1] = 0;
 164     depth_bits_array[2] = depth_bits;
 165     depth_bits_array[3] = depth_bits;
 166
 167     /* Just like with the accumulation buffer, always provide some modes
 168      * with a stencil buffer.
 169      */
 170     stencil_bits_array[0] = 0;
 171     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 172     stencil_bits_array[2] = 0;
 173     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 174
 175     msaa_samples_array[0] = 0;
 176
 177     depth_buffer_factor = 4;
 178     back_buffer_factor = 2;
 179
 180     switch (pixel_bits) {
 181     case 8:
 182         fb_format = GL_RGB;
 183         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 184         break;
 185     case 16:
 186         fb_format = GL_RGB;
 187         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 188         break;
 189     case 24:
 190         fb_format = GL_BGR;
 191         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 192         break;
 193     case 32:
 194         fb_format = GL_BGRA;
 195         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 196         break;
 197     default:
 198         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 199                 pixel_bits);
 200         return NULL;
 201     }
 202
 203     configs = driCreateConfigs(fb_format, fb_type,
 204                                depth_bits_array, stencil_bits_array,
 205                                depth_buffer_factor, back_buffer_modes,
 206                                back_buffer_factor, msaa_samples_array, 1);
 207     if (configs == NULL) {
 208         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 209                 __LINE__);
 210         return NULL;
 211     }
 212
 213     return configs;
 214 }
 215
 216 static __DRIscreen *
 217 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 218                    const __DRIconfig ***driver_configs, void *data)
 219 {
 220     static const __DRIextension *emptyExtensionList[] = { NULL };
 221     __DRIscreen *psp;
 222     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 223
 224     (void) data;
 225
 226     TRACE;
 227
 228     psp = _mesa_calloc(sizeof(*psp));
 229     if (!psp)
 230         return NULL;
 231
 232     setupLoaderExtensions(psp, extensions);
 233
 234     psp->num = scrn;
 235     psp->extensions = emptyExtensionList;
 236
 237     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 238     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 239     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 240     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 241
 242     configs16 = driConcatConfigs(configs8, configs16);
 243     configs24 = driConcatConfigs(configs16, configs24);
 244     *driver_configs = (const __DRIconfig **)
 245        driConcatConfigs(configs24, configs32);
 246
 247     driInitExtensions( NULL, card_extensions, GL_FALSE );
 248
 249     return psp;
 250 }
 251
 252 static void driDestroyScreen(__DRIscreen *psp)
 253 {
 254     TRACE;
 255
 256     if (psp) {
 257         _mesa_free(psp);
 258     }
 259 }
 260
 261 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 262 {
 263     TRACE;
 264
 265     return psp->extensions;
 266 }
 267
 268
 269 /**
 270  * Framebuffer and renderbuffer-related functions.
 271  */
 272
 273 static GLuint
 274 choose_pixel_format(const GLvisual *v)
 275 {
 276     if (v->rgbMode) {
 277         int depth = v->rgbBits;
 278
 279         if (depth == 32
 280             && v->redMask   == 0xff0000
 281             && v->greenMask == 0x00ff00
 282             && v->blueMask  == 0x0000ff)
 283             return PF_A8R8G8B8;
 284         else if (depth == 24
 285             && v->redMask   == 0xff0000
 286             && v->greenMask == 0x00ff00
 287             && v->blueMask  == 0x0000ff)
 288             return PF_X8R8G8B8;
 289         else if (depth == 16
 290             && v->redMask   == 0xf800
 291             && v->greenMask == 0x07e0
 292             && v->blueMask  == 0x001f)
 293             return PF_R5G6B5;
 294         else if (depth == 8
 295             && v->redMask   == 0x07
 296             && v->greenMask == 0x38
 297             && v->blueMask  == 0xc0)
 298             return PF_R3G3B2;
 299     }
 300     else {
 301         if (v->indexBits == 8)
 302             return PF_CI8;
 303     }
 304
 305     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 306     return 0;
 307 }
 308
 309 static void
 310 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 311 {
 312     TRACE;
 313
 314     _mesa_free(rb->Data);
 315     _mesa_free(rb);
 316 }
 317
 318 static GLboolean
 319 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 320                            GLenum internalFormat, GLuint width, GLuint height)
 321 {
 322     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 323     unsigned mask = PITCH_ALIGN_BITS - 1;
 324
 325     TRACE;
 326
 327     rb->Data = NULL;
 328     rb->Width = width;
 329     rb->Height = height;
 330
 331     /* always pad to PITCH_ALIGN_BITS */
 332     xrb->pitch = ((width * xrb->bpp + mask) & ~mask) / 8;
 333
 334     return GL_TRUE;
 335 }
 336
 337 static GLboolean
 338 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 339                           GLenum internalFormat, GLuint width, GLuint height)
 340 {
 341     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 342
 343     TRACE;
 344
 345     _mesa_free(rb->Data);
 346
 347     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 348
 349     rb->Data = _mesa_malloc(height * xrb->pitch);
 350
 351     return GL_TRUE;
 352 }
 353
 354 static struct swrast_renderbuffer *
 355 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 356 {
 357     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 358     GLuint pixel_format;
 359
 360     TRACE;
 361
 362     if (!xrb)
 363         return NULL;
 364
 365     _mesa_init_renderbuffer(&xrb->Base, 0);
 366
 367     pixel_format = choose_pixel_format(visual);
 368
 369     xrb->Base.Delete = swrast_delete_renderbuffer;
 370     if (front) {
 371         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 372         swrast_set_span_funcs_front(xrb, pixel_format);
 373     }
 374     else {
 375         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 376         swrast_set_span_funcs_back(xrb, pixel_format);
 377     }
 378
 379     switch (pixel_format) {
 380     case PF_A8R8G8B8:
 381         xrb->Base.InternalFormat = GL_RGBA;
 382         xrb->Base._BaseFormat = GL_RGBA;
 383         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 384         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 385         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 386         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 387         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 388         xrb->bpp = 32;
 389         break;
 390     case PF_X8R8G8B8:
 391         xrb->Base.InternalFormat = GL_RGB;
 392         xrb->Base._BaseFormat = GL_RGB;
 393         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 394         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 395         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 396         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 397         xrb->Base.AlphaBits = 0;
 398         xrb->bpp = 32;
 399         break;
 400     case PF_R5G6B5:
 401         xrb->Base.InternalFormat = GL_RGB;
 402         xrb->Base._BaseFormat = GL_RGB;
 403         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 404         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 405         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 406         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 407         xrb->Base.AlphaBits = 0;
 408         xrb->bpp = 16;
 409         break;
 410     case PF_R3G3B2:
 411         xrb->Base.InternalFormat = GL_RGB;
 412         xrb->Base._BaseFormat = GL_RGB;
 413         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 414         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 415         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 416         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 417         xrb->Base.AlphaBits = 0;
 418         xrb->bpp = 8;
 419         break;
 420     case PF_CI8:
 421         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 422         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 423         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 424         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 425         xrb->bpp = 8;
 426         break;
 427     default:
 428         return NULL;
 429     }
 430
 431     return xrb;
 432 }
 433
 434 static __DRIdrawable *
 435 driCreateNewDrawable(__DRIscreen *screen,
 436                      const __DRIconfig *config, void *data)
 437 {
 438     __DRIdrawable *buf;
 439     struct swrast_renderbuffer *frontrb, *backrb;
 440
 441     TRACE;
 442
 443     buf = _mesa_calloc(sizeof *buf);
 444     if (!buf)
 445         return NULL;
 446
 447     buf->loaderPrivate = data;
 448
 449     buf->driScreenPriv = screen;
 450
 451     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 452
 453     /* basic framebuffer setup */
 454     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 455
 456     /* add front renderbuffer */
 457     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 458     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 459
 460     /* add back renderbuffer */
 461     if (config->modes.doubleBufferMode) {
 462         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 463         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 464     }
 465
 466     /* add software renderbuffers */
 467     _mesa_add_soft_renderbuffers(&buf->Base,
 468                                  GL_FALSE, /* color */
 469                                  config->modes.haveDepthBuffer,
 470                                  config->modes.haveStencilBuffer,
 471                                  config->modes.haveAccumBuffer,
 472                                  GL_FALSE, /* alpha */
 473                                  GL_FALSE /* aux bufs */);
 474
 475     return buf;
 476 }
 477
 478 static void
 479 driDestroyDrawable(__DRIdrawable *buf)
 480 {
 481     TRACE;
 482
 483     if (buf) {
 484         struct gl_framebuffer *fb = &buf->Base;
 485
 486         _mesa_free(buf->row);
 487
 488         fb->DeletePending = GL_TRUE;
 489         _mesa_reference_framebuffer(&fb, NULL);
 490     }
 491 }
 492
 493 static void driSwapBuffers(__DRIdrawable *buf)
 494 {
 495     GET_CURRENT_CONTEXT(ctx);
 496
 497     struct swrast_renderbuffer *frontrb =
 498         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 499     struct swrast_renderbuffer *backrb =
 500         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 501
 502     __DRIscreen *screen = buf->driScreenPriv;
 503
 504     TRACE;
 505
 506     /* check for signle-buffered */
 507     if (backrb == NULL)
 508         return;
 509
 510     /* check if swapping currently bound buffer */
 511     if (ctx && ctx->DrawBuffer == &(buf->Base)) {
 512         /* flush pending rendering */
 513         _mesa_notifySwapBuffers(ctx);
 514     }
 515
 516     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 517                                     0, 0,
 518                                     frontrb->Base.Width,
 519                                     frontrb->Base.Height,
 520                                     backrb->Base.Data,
 521                                     buf->loaderPrivate);
 522 }
 523
 524
 525 /**
 526  * General device driver functions.
 527  */
 528
 529 static void
 530 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 531 {
 532     __DRIdrawable *buf = swrast_drawable(fb);
 533     __DRIscreen *screen = buf->driScreenPriv;
 534     int x, y;
 535
 536     screen->swrast_loader->getDrawableInfo(buf,
 537                                            &x, &y, w, h,
 538                                            buf->loaderPrivate);
 539 }
 540
 541 static void
 542 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 543 {
 544     GLsizei width, height;
 545
 546     get_window_size(fb, &width, &height);
 547     if (fb->Width != width || fb->Height != height) {
 548         _mesa_resize_framebuffer(ctx, fb, width, height);
 549     }
 550 }
 551
 552 static const GLubyte *
 553 get_string(GLcontext *ctx, GLenum pname)
 554 {
 555     (void) ctx;
 556     switch (pname) {
 557         case GL_VENDOR:
 558             return (const GLubyte *) "Mesa Project";
 559         case GL_RENDERER:
 560             return (const GLubyte *) "Software Rasterizer";
 561         default:
 562             return NULL;
 563     }
 564 }
 565
 566 static void
 567 update_state( GLcontext *ctx, GLuint new_state )
 568 {
 569     /* not much to do here - pass it on */
 570     _swrast_InvalidateState( ctx, new_state );
 571     _swsetup_InvalidateState( ctx, new_state );
 572     _vbo_InvalidateState( ctx, new_state );
 573     _tnl_InvalidateState( ctx, new_state );
 574 }
 575
 576 static void
 577 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 578 {
 579     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 580     GLframebuffer *read = ctx->WinSysReadBuffer;
 581
 582     swrast_check_and_update_window_size(ctx, draw);
 583     swrast_check_and_update_window_size(ctx, read);
 584 }
 585
 586 static void
 587 swrast_init_driver_functions(struct dd_function_table *driver)
 588 {
 589     driver->GetString = get_string;
 590     driver->UpdateState = update_state;
 591     driver->GetBufferSize = NULL;
 592     driver->Viewport = viewport;
 593 }
 594
 595
 596 /**
 597  * Context-related functions.
 598  */
 599
 600 static __DRIcontext *
 601 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 602                     __DRIcontext *shared, void *data)
 603 {
 604     __DRIcontext *ctx;
 605     GLcontext *mesaCtx;
 606     struct dd_function_table functions;
 607
 608     TRACE;
 609
 610     ctx = _mesa_calloc(sizeof *ctx);
 611     if (!ctx)
 612         return NULL;
 613
 614     ctx->loaderPrivate = data;
 615
 616     ctx->driScreenPriv = screen;
 617
 618     /* build table of device driver functions */
 619     _mesa_init_driver_functions(&functions);
 620     swrast_init_driver_functions(&functions);
 621
 622     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 623                                   shared ? &shared->Base : NULL,
 624                                   &functions, (void *) ctx)) {
 625       _mesa_free(ctx);
 626       return NULL;
 627     }
 628
 629     mesaCtx = &ctx->Base;
 630
 631     /* do bounds checking to prevent segfaults and server crashes! */
 632     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 633
 634     /* create module contexts */
 635     _swrast_CreateContext( mesaCtx );
 636     _vbo_CreateContext( mesaCtx );
 637     _tnl_CreateContext( mesaCtx );
 638     _swsetup_CreateContext( mesaCtx );
 639     _swsetup_Wakeup( mesaCtx );
 640
 641     /* use default TCL pipeline */
 642     {
 643        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 644        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 645     }
 646
 647     _mesa_enable_sw_extensions(mesaCtx);
 648     _mesa_enable_1_3_extensions(mesaCtx);
 649     _mesa_enable_1_4_extensions(mesaCtx);
 650     _mesa_enable_1_5_extensions(mesaCtx);
 651     _mesa_enable_2_0_extensions(mesaCtx);
 652     _mesa_enable_2_1_extensions(mesaCtx);
 653
 654     _mesa_meta_init(mesaCtx);
 655
 656     return ctx;
 657 }
 658
 659 static void
 660 driDestroyContext(__DRIcontext *ctx)
 661 {
 662     GLcontext *mesaCtx;
 663     TRACE;
 664
 665     if (ctx) {
 666         mesaCtx = &ctx->Base;
 667         _mesa_meta_free(mesaCtx);
 668         _swsetup_DestroyContext( mesaCtx );
 669         _swrast_DestroyContext( mesaCtx );
 670         _tnl_DestroyContext( mesaCtx );
 671         _vbo_DestroyContext( mesaCtx );
 672         _mesa_destroy_context( mesaCtx );
 673     }
 674 }
 675
 676 static int
 677 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 678 {
 679     TRACE;
 680
 681     _mesa_copy_context(&src->Base, &dst->Base, mask);
 682     return GL_TRUE;
 683 }
 684
 685 static int driBindContext(__DRIcontext *ctx,
 686                           __DRIdrawable *draw,
 687                           __DRIdrawable *read)
 688 {
 689     GLcontext *mesaCtx;
 690     GLframebuffer *mesaDraw;
 691     GLframebuffer *mesaRead;
 692     TRACE;
 693
 694     if (ctx) {
 695         if (!draw || !read)
 696             return GL_FALSE;
 697
 698         mesaCtx = &ctx->Base;
 699         mesaDraw = &draw->Base;
 700         mesaRead = &read->Base;
 701
 702         /* check for same context and buffer */
 703         if (mesaCtx == _mesa_get_current_context()
 704             && mesaCtx->DrawBuffer == mesaDraw
 705             && mesaCtx->ReadBuffer == mesaRead) {
 706             return GL_TRUE;
 707         }
 708
 709         _glapi_check_multithread();
 710
 711         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 712         if (read != draw)
 713             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 714
 715         _mesa_make_current( mesaCtx,
 716                             mesaDraw,
 717                             mesaRead );
 718     }
 719     else {
 720         /* unbind */
 721         _mesa_make_current( NULL, NULL, NULL );
 722     }
 723
 724     return GL_TRUE;
 725 }
 726
 727 static int driUnbindContext(__DRIcontext *ctx)
 728 {
 729     TRACE;
 730     (void) ctx;
 731     return GL_TRUE;
 732 }
 733
 734
 735 static const __DRIcoreExtension driCoreExtension = {
 736     { __DRI_CORE, __DRI_CORE_VERSION },
 737     NULL, /* driCreateNewScreen */
 738     driDestroyScreen,
 739     driGetExtensions,
 740     driGetConfigAttrib,
 741     driIndexConfigAttrib,
 742     NULL, /* driCreateNewDrawable */
 743     driDestroyDrawable,
 744     driSwapBuffers,
 745     driCreateNewContext,
 746     driCopyContext,
 747     driDestroyContext,
 748     driBindContext,
 749     driUnbindContext
 750 };
 751
 752 static const __DRIswrastExtension driSWRastExtension = {
 753     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 754     driCreateNewScreen,
 755     driCreateNewDrawable
 756 };
 757
 758 /* This is the table of extensions that the loader will dlsym() for. */
 759 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 760     &driCoreExtension.base,
 761     &driSWRastExtension.base,
 762     NULL
 763 };