src/mesa/drivers/dri/swrast/swrast.c

   1 /*
   2  * Copyright 2008, 2010 George Sapountzis <gsapountzis@gmail.com>
   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/formats.h"
  37 #include "main/framebuffer.h"
  38 #include "main/imports.h"
  39 #include "main/renderbuffer.h"
  40 #include "swrast/swrast.h"
  41 #include "swrast_setup/swrast_setup.h"
  42 #include "tnl/tnl.h"
  43 #include "tnl/t_context.h"
  44 #include "tnl/t_pipeline.h"
  45 #include "vbo/vbo.h"
  46 #include "drivers/common/driverfuncs.h"
  47 #include "drivers/common/meta.h"
  48 #include "utils.h"
  49
  50 #include "main/teximage.h"
  51 #include "main/texformat.h"
  52 #include "main/texstate.h"
  53
  54 #include "swrast_priv.h"
  55
  56
  57 /**
  58  * Screen and config-related functions
  59  */
  60
  61 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  62                                 GLint texture_format, __DRIdrawable *dPriv)
  63 {
  64     struct dri_context *dri_ctx;
  65     int x, y, w, h;
  66     __DRIscreen *sPriv = dPriv->driScreenPriv;
  67     struct gl_texture_unit *texUnit;
  68     struct gl_texture_object *texObj;
  69     struct gl_texture_image *texImage;
  70     uint32_t internalFormat;
  71     gl_format texFormat;
  72
  73     dri_ctx = pDRICtx->driverPrivate;
  74
  75     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  76
  77     texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
  78     texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
  79     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  80
  81     _mesa_lock_texture(&dri_ctx->Base, texObj);
  82
  83     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
  84
  85     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  86         texFormat = MESA_FORMAT_XRGB8888;
  87     else
  88         texFormat = MESA_FORMAT_ARGB8888;
  89
  90     _mesa_init_teximage_fields(&dri_ctx->Base, target, texImage,
  91                                w, h, 1, 0, internalFormat, texFormat);
  92
  93     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)texImage->Data,
  94                                    dPriv->loaderPrivate);
  95
  96     _mesa_unlock_texture(&dri_ctx->Base, texObj);
  97 }
  98
  99 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 100                                __DRIdrawable *dPriv)
 101 {
 102     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 103 }
 104
 105 static const __DRItexBufferExtension swrastTexBufferExtension = {
 106     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 107     swrastSetTexBuffer,
 108     swrastSetTexBuffer2,
 109 };
 110
 111 static const __DRIextension *dri_screen_extensions[] = {
 112     &swrastTexBufferExtension.base,
 113     NULL
 114 };
 115
 116 static __DRIconfig **
 117 swrastFillInModes(__DRIscreen *psp,
 118                   unsigned pixel_bits, unsigned depth_bits,
 119                   unsigned stencil_bits, GLboolean have_back_buffer)
 120 {
 121     __DRIconfig **configs;
 122     unsigned depth_buffer_factor;
 123     unsigned back_buffer_factor;
 124     GLenum fb_format;
 125     GLenum fb_type;
 126
 127     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 128      * support pageflipping at all.
 129      */
 130     static const GLenum back_buffer_modes[] = {
 131         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 132     };
 133
 134     uint8_t depth_bits_array[4];
 135     uint8_t stencil_bits_array[4];
 136     uint8_t msaa_samples_array[1];
 137
 138     depth_bits_array[0] = 0;
 139     depth_bits_array[1] = 0;
 140     depth_bits_array[2] = depth_bits;
 141     depth_bits_array[3] = depth_bits;
 142
 143     /* Just like with the accumulation buffer, always provide some modes
 144      * with a stencil buffer.
 145      */
 146     stencil_bits_array[0] = 0;
 147     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 148     stencil_bits_array[2] = 0;
 149     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 150
 151     msaa_samples_array[0] = 0;
 152
 153     depth_buffer_factor = 4;
 154     back_buffer_factor = 2;
 155
 156     switch (pixel_bits) {
 157     case 8:
 158         fb_format = GL_RGB;
 159         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 160         break;
 161     case 16:
 162         fb_format = GL_RGB;
 163         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 164         break;
 165     case 24:
 166         fb_format = GL_BGR;
 167         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 168         break;
 169     case 32:
 170         fb_format = GL_BGRA;
 171         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 172         break;
 173     default:
 174         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 175                 pixel_bits);
 176         return NULL;
 177     }
 178
 179     configs = driCreateConfigs(fb_format, fb_type,
 180                                depth_bits_array, stencil_bits_array,
 181                                depth_buffer_factor, back_buffer_modes,
 182                                back_buffer_factor, msaa_samples_array, 1,
 183                                GL_TRUE);
 184     if (configs == NULL) {
 185         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 186                 __LINE__);
 187         return NULL;
 188     }
 189
 190     return configs;
 191 }
 192
 193 static const __DRIconfig **
 194 dri_init_screen(__DRIscreen * psp)
 195 {
 196     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 197
 198     TRACE;
 199
 200     psp->extensions = dri_screen_extensions;
 201
 202     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 203     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 204     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 205     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 206
 207     configs16 = driConcatConfigs(configs8, configs16);
 208     configs24 = driConcatConfigs(configs16, configs24);
 209     configs32 = driConcatConfigs(configs24, configs32);
 210
 211     return (const __DRIconfig **)configs32;
 212 }
 213
 214 static void
 215 dri_destroy_screen(__DRIscreen * sPriv)
 216 {
 217     TRACE;
 218 }
 219
 220
 221 /**
 222  * Framebuffer and renderbuffer-related functions.
 223  */
 224
 225 static GLuint
 226 choose_pixel_format(const struct gl_config *v)
 227 {
 228     int depth = v->rgbBits;
 229
 230     if (depth == 32
 231         && v->redMask   == 0xff0000
 232         && v->greenMask == 0x00ff00
 233         && v->blueMask  == 0x0000ff)
 234         return PF_A8R8G8B8;
 235     else if (depth == 24
 236              && v->redMask   == 0xff0000
 237              && v->greenMask == 0x00ff00
 238              && v->blueMask  == 0x0000ff)
 239         return PF_X8R8G8B8;
 240     else if (depth == 16
 241              && v->redMask   == 0xf800
 242              && v->greenMask == 0x07e0
 243              && v->blueMask  == 0x001f)
 244         return PF_R5G6B5;
 245     else if (depth == 8
 246              && v->redMask   == 0x07
 247              && v->greenMask == 0x38
 248              && v->blueMask  == 0xc0)
 249         return PF_R3G3B2;
 250
 251     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 252     return 0;
 253 }
 254
 255 static void
 256 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 257 {
 258     TRACE;
 259
 260     free(rb->Data);
 261     free(rb);
 262 }
 263
 264 /* see bytes_per_line in libGL */
 265 static INLINE int
 266 bytes_per_line(unsigned pitch_bits, unsigned mul)
 267 {
 268    unsigned mask = mul - 1;
 269
 270    return ((pitch_bits + mask) & ~mask) / 8;
 271 }
 272
 273 static GLboolean
 274 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 275                            GLenum internalFormat, GLuint width, GLuint height)
 276 {
 277     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 278
 279     TRACE;
 280
 281     rb->Data = NULL;
 282     rb->Width = width;
 283     rb->Height = height;
 284
 285     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 286
 287     return GL_TRUE;
 288 }
 289
 290 static GLboolean
 291 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 292                           GLenum internalFormat, GLuint width, GLuint height)
 293 {
 294     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 295
 296     TRACE;
 297
 298     free(rb->Data);
 299
 300     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 301
 302     rb->Data = malloc(height * xrb->pitch);
 303
 304     return GL_TRUE;
 305 }
 306
 307 static struct swrast_renderbuffer *
 308 swrast_new_renderbuffer(const struct gl_config *visual, GLboolean front)
 309 {
 310     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 311     GLuint pixel_format;
 312
 313     TRACE;
 314
 315     if (!xrb)
 316         return NULL;
 317
 318     _mesa_init_renderbuffer(&xrb->Base, 0);
 319
 320     pixel_format = choose_pixel_format(visual);
 321
 322     xrb->Base.Delete = swrast_delete_renderbuffer;
 323     if (front) {
 324         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 325         swrast_set_span_funcs_front(xrb, pixel_format);
 326     }
 327     else {
 328         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 329         swrast_set_span_funcs_back(xrb, pixel_format);
 330     }
 331
 332     switch (pixel_format) {
 333     case PF_A8R8G8B8:
 334         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 335         xrb->Base.InternalFormat = GL_RGBA;
 336         xrb->Base._BaseFormat = GL_RGBA;
 337         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 338         xrb->bpp = 32;
 339         break;
 340     case PF_X8R8G8B8:
 341         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 342         xrb->Base.InternalFormat = GL_RGB;
 343         xrb->Base._BaseFormat = GL_RGB;
 344         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 345         xrb->bpp = 32;
 346         break;
 347     case PF_R5G6B5:
 348         xrb->Base.Format = MESA_FORMAT_RGB565;
 349         xrb->Base.InternalFormat = GL_RGB;
 350         xrb->Base._BaseFormat = GL_RGB;
 351         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 352         xrb->bpp = 16;
 353         break;
 354     case PF_R3G3B2:
 355         xrb->Base.Format = MESA_FORMAT_RGB332;
 356         xrb->Base.InternalFormat = GL_RGB;
 357         xrb->Base._BaseFormat = GL_RGB;
 358         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 359         xrb->bpp = 8;
 360         break;
 361     default:
 362         return NULL;
 363     }
 364
 365     return xrb;
 366 }
 367
 368 static GLboolean
 369 dri_create_buffer(__DRIscreen * sPriv,
 370                   __DRIdrawable * dPriv,
 371                   const struct gl_config * visual, GLboolean isPixmap)
 372 {
 373     struct dri_drawable *drawable = NULL;
 374     struct gl_framebuffer *fb;
 375     struct swrast_renderbuffer *frontrb, *backrb;
 376
 377     TRACE;
 378
 379     drawable = CALLOC_STRUCT(dri_drawable);
 380     if (drawable == NULL)
 381         goto drawable_fail;
 382
 383     dPriv->driverPrivate = drawable;
 384     drawable->dPriv = dPriv;
 385
 386     drawable->row = malloc(MAX_WIDTH * 4);
 387     if (drawable->row == NULL)
 388         goto drawable_fail;
 389
 390     fb = &drawable->Base;
 391
 392     /* basic framebuffer setup */
 393     _mesa_initialize_window_framebuffer(fb, visual);
 394
 395     /* add front renderbuffer */
 396     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 397     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 398
 399     /* add back renderbuffer */
 400     if (visual->doubleBufferMode) {
 401         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 402         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 403     }
 404
 405     /* add software renderbuffers */
 406     _mesa_add_soft_renderbuffers(fb,
 407                                  GL_FALSE, /* color */
 408                                  visual->haveDepthBuffer,
 409                                  visual->haveStencilBuffer,
 410                                  visual->haveAccumBuffer,
 411                                  GL_FALSE, /* alpha */
 412                                  GL_FALSE /* aux bufs */);
 413
 414     return GL_TRUE;
 415
 416 drawable_fail:
 417
 418     if (drawable)
 419         free(drawable->row);
 420
 421     FREE(drawable);
 422
 423     return GL_FALSE;
 424 }
 425
 426 static void
 427 dri_destroy_buffer(__DRIdrawable * dPriv)
 428 {
 429     TRACE;
 430
 431     if (dPriv) {
 432         struct dri_drawable *drawable = dri_drawable(dPriv);
 433         struct gl_framebuffer *fb;
 434
 435         free(drawable->row);
 436
 437         fb = &drawable->Base;
 438
 439         fb->DeletePending = GL_TRUE;
 440         _mesa_reference_framebuffer(&fb, NULL);
 441     }
 442 }
 443
 444 static void
 445 dri_swap_buffers(__DRIdrawable * dPriv)
 446 {
 447     __DRIscreen *sPriv = dPriv->driScreenPriv;
 448
 449     GET_CURRENT_CONTEXT(ctx);
 450
 451     struct dri_drawable *drawable = dri_drawable(dPriv);
 452     struct gl_framebuffer *fb;
 453     struct swrast_renderbuffer *frontrb, *backrb;
 454
 455     TRACE;
 456
 457     fb = &drawable->Base;
 458
 459     frontrb =
 460         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 461     backrb =
 462         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 463
 464     /* check for signle-buffered */
 465     if (backrb == NULL)
 466         return;
 467
 468     /* check if swapping currently bound buffer */
 469     if (ctx && ctx->DrawBuffer == fb) {
 470         /* flush pending rendering */
 471         _mesa_notifySwapBuffers(ctx);
 472     }
 473
 474     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 475                                    0, 0,
 476                                    frontrb->Base.Width,
 477                                    frontrb->Base.Height,
 478                                    backrb->Base.Data,
 479                                    dPriv->loaderPrivate);
 480 }
 481
 482
 483 /**
 484  * General device driver functions.
 485  */
 486
 487 static void
 488 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 489 {
 490     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 491     __DRIscreen *sPriv = dPriv->driScreenPriv;
 492     int x, y;
 493
 494     sPriv->swrast_loader->getDrawableInfo(dPriv,
 495                                           &x, &y, w, h,
 496                                           dPriv->loaderPrivate);
 497 }
 498
 499 static void
 500 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 501 {
 502     GLsizei width, height;
 503
 504     get_window_size(fb, &width, &height);
 505     if (fb->Width != width || fb->Height != height) {
 506         _mesa_resize_framebuffer(ctx, fb, width, height);
 507     }
 508 }
 509
 510 static const GLubyte *
 511 get_string(struct gl_context *ctx, GLenum pname)
 512 {
 513     (void) ctx;
 514     switch (pname) {
 515         case GL_VENDOR:
 516             return (const GLubyte *) "Mesa Project";
 517         case GL_RENDERER:
 518             return (const GLubyte *) "Software Rasterizer";
 519         default:
 520             return NULL;
 521     }
 522 }
 523
 524 static void
 525 update_state( struct gl_context *ctx, GLuint new_state )
 526 {
 527     /* not much to do here - pass it on */
 528     _swrast_InvalidateState( ctx, new_state );
 529     _swsetup_InvalidateState( ctx, new_state );
 530     _vbo_InvalidateState( ctx, new_state );
 531     _tnl_InvalidateState( ctx, new_state );
 532 }
 533
 534 static void
 535 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 536 {
 537     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 538     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 539
 540     swrast_check_and_update_window_size(ctx, draw);
 541     swrast_check_and_update_window_size(ctx, read);
 542 }
 543
 544 static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
 545                                            GLint internalFormat,
 546                                            GLenum format,
 547                                            GLenum type)
 548 {
 549     if (internalFormat == GL_RGB)
 550         return MESA_FORMAT_XRGB8888;
 551     return _mesa_choose_tex_format(ctx, internalFormat, format, type);
 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     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 562 }
 563
 564 static const char *es2_extensions[] = {
 565    /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
 566    "GL_ARB_draw_buffers",
 567    "GL_ARB_multisample",
 568    "GL_ARB_texture_compression",
 569    "GL_ARB_transpose_matrix",
 570    "GL_ARB_vertex_buffer_object",
 571    "GL_ARB_window_pos",
 572    "GL_EXT_blend_func_separate",
 573    "GL_EXT_compiled_vertex_array",
 574    "GL_EXT_framebuffer_blit",
 575    "GL_EXT_multi_draw_arrays",
 576    "GL_EXT_polygon_offset",
 577    "GL_EXT_texture_object",
 578    "GL_EXT_vertex_array",
 579    "GL_IBM_multimode_draw_arrays",
 580    "GL_MESA_window_pos",
 581    "GL_NV_vertex_program",
 582
 583    /* Required by GLES2 */
 584    "GL_ARB_fragment_program",
 585    "GL_ARB_fragment_shader",
 586    "GL_ARB_multitexture",
 587    "GL_ARB_shader_objects",
 588    "GL_ARB_texture_cube_map",
 589    "GL_ARB_texture_mirrored_repeat",
 590    "GL_ARB_texture_non_power_of_two",
 591    "GL_ARB_vertex_shader",
 592    "GL_EXT_blend_color",
 593    "GL_EXT_blend_equation_separate",
 594    "GL_EXT_blend_minmax",
 595    "GL_EXT_blend_subtract",
 596    "GL_EXT_stencil_wrap",
 597
 598    /* Optional GLES2 */
 599    "GL_ARB_framebuffer_object",
 600    "GL_EXT_texture_filter_anisotropic",
 601    "GL_ARB_depth_texture",
 602    "GL_EXT_packed_depth_stencil",
 603    "GL_EXT_framebuffer_object",
 604    NULL,
 605 };
 606
 607 static void
 608 InitExtensionsES2(struct gl_context *ctx)
 609 {
 610    int i;
 611
 612    /* Can't use driInitExtensions() since it uses extensions from
 613     * main/remap_helper.h when called the first time. */
 614
 615    for (i = 0; es2_extensions[i]; i++)
 616       _mesa_enable_extension(ctx, es2_extensions[i]);
 617 }
 618
 619 /**
 620  * Context-related functions.
 621  */
 622
 623 static GLboolean
 624 dri_create_context(gl_api api,
 625                    const struct gl_config * visual,
 626                    __DRIcontext * cPriv, void *sharedContextPrivate)
 627 {
 628     struct dri_context *ctx = NULL;
 629     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 630     struct gl_context *mesaCtx = NULL;
 631     struct gl_context *sharedCtx = NULL;
 632     struct dd_function_table functions;
 633
 634     TRACE;
 635
 636     ctx = CALLOC_STRUCT(dri_context);
 637     if (ctx == NULL)
 638         goto context_fail;
 639
 640     cPriv->driverPrivate = ctx;
 641     ctx->cPriv = cPriv;
 642
 643     /* build table of device driver functions */
 644     _mesa_init_driver_functions(&functions);
 645     swrast_init_driver_functions(&functions);
 646
 647     if (share) {
 648         sharedCtx = &share->Base;
 649     }
 650
 651     mesaCtx = &ctx->Base;
 652
 653     /* basic context setup */
 654     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions, (void *) cPriv)) {
 655         goto context_fail;
 656     }
 657
 658     /* do bounds checking to prevent segfaults and server crashes! */
 659     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 660
 661     /* create module contexts */
 662     _swrast_CreateContext( mesaCtx );
 663     _vbo_CreateContext( mesaCtx );
 664     _tnl_CreateContext( mesaCtx );
 665     _swsetup_CreateContext( mesaCtx );
 666     _swsetup_Wakeup( mesaCtx );
 667
 668     /* use default TCL pipeline */
 669     {
 670        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 671        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 672     }
 673
 674     _mesa_meta_init(mesaCtx);
 675     _mesa_enable_sw_extensions(mesaCtx);
 676
 677     switch (api) {
 678     case API_OPENGL:
 679         _mesa_enable_1_3_extensions(mesaCtx);
 680         _mesa_enable_1_4_extensions(mesaCtx);
 681         _mesa_enable_1_5_extensions(mesaCtx);
 682         _mesa_enable_2_0_extensions(mesaCtx);
 683         _mesa_enable_2_1_extensions(mesaCtx);
 684
 685         driInitExtensions( mesaCtx, NULL, GL_FALSE );
 686         break;
 687     case API_OPENGLES:
 688         _mesa_enable_1_3_extensions(mesaCtx);
 689         _mesa_enable_1_4_extensions(mesaCtx);
 690         _mesa_enable_1_5_extensions(mesaCtx);
 691
 692         break;
 693     case API_OPENGLES2:
 694         InitExtensionsES2( mesaCtx);
 695         break;
 696     }
 697
 698     return GL_TRUE;
 699
 700 context_fail:
 701
 702     FREE(ctx);
 703
 704     return GL_FALSE;
 705 }
 706
 707 static void
 708 dri_destroy_context(__DRIcontext * cPriv)
 709 {
 710     TRACE;
 711
 712     if (cPriv) {
 713         struct dri_context *ctx = dri_context(cPriv);
 714         struct gl_context *mesaCtx;
 715
 716         mesaCtx = &ctx->Base;
 717
 718         _mesa_meta_free(mesaCtx);
 719         _swsetup_DestroyContext( mesaCtx );
 720         _swrast_DestroyContext( mesaCtx );
 721         _tnl_DestroyContext( mesaCtx );
 722         _vbo_DestroyContext( mesaCtx );
 723         _mesa_destroy_context( mesaCtx );
 724     }
 725 }
 726
 727 static GLboolean
 728 dri_make_current(__DRIcontext * cPriv,
 729                  __DRIdrawable * driDrawPriv,
 730                  __DRIdrawable * driReadPriv)
 731 {
 732     struct gl_context *mesaCtx;
 733     struct gl_framebuffer *mesaDraw;
 734     struct gl_framebuffer *mesaRead;
 735     TRACE;
 736
 737     if (cPriv) {
 738         struct dri_context *ctx = dri_context(cPriv);
 739         struct dri_drawable *draw;
 740         struct dri_drawable *read;
 741
 742         if (!driDrawPriv || !driReadPriv)
 743             return GL_FALSE;
 744
 745         draw = dri_drawable(driDrawPriv);
 746         read = dri_drawable(driReadPriv);
 747         mesaCtx = &ctx->Base;
 748         mesaDraw = &draw->Base;
 749         mesaRead = &read->Base;
 750
 751         /* check for same context and buffer */
 752         if (mesaCtx == _mesa_get_current_context()
 753             && mesaCtx->DrawBuffer == mesaDraw
 754             && mesaCtx->ReadBuffer == mesaRead) {
 755             return GL_TRUE;
 756         }
 757
 758         _glapi_check_multithread();
 759
 760         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 761         if (mesaRead != mesaDraw)
 762             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 763
 764         _mesa_make_current( mesaCtx,
 765                             mesaDraw,
 766                             mesaRead );
 767     }
 768     else {
 769         /* unbind */
 770         _mesa_make_current( NULL, NULL, NULL );
 771     }
 772
 773     return GL_TRUE;
 774 }
 775
 776 static GLboolean
 777 dri_unbind_context(__DRIcontext * cPriv)
 778 {
 779     TRACE;
 780     (void) cPriv;
 781
 782     /* Unset current context and dispath table */
 783     _mesa_make_current(NULL, NULL, NULL);
 784
 785     return GL_TRUE;
 786 }
 787
 788
 789 const struct __DriverAPIRec driDriverAPI = {
 790     .InitScreen = dri_init_screen,
 791     .DestroyScreen = dri_destroy_screen,
 792     .CreateContext = dri_create_context,
 793     .DestroyContext = dri_destroy_context,
 794     .CreateBuffer = dri_create_buffer,
 795     .DestroyBuffer = dri_destroy_buffer,
 796     .SwapBuffers = dri_swap_buffers,
 797     .MakeCurrent = dri_make_current,
 798     .UnbindContext = dri_unbind_context,
 799 };
 800
 801 /* This is the table of extensions that the loader will dlsym() for. */
 802 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 803     &driCoreExtension.base,
 804     &driSWRastExtension.base,
 805     NULL
 806 };