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->depthBits == 32
 237              && v->redMask   == 0xff0000
 238              && v->greenMask == 0x00ff00
 239              && v->blueMask  == 0x0000ff)
 240         return PF_X8R8G8B8;
 241     else if (depth == 24
 242              && v->depthBits == 24
 243              && v->redMask   == 0xff0000
 244              && v->greenMask == 0x00ff00
 245              && v->blueMask  == 0x0000ff)
 246         return PF_R8G8B8;
 247     else if (depth == 16
 248              && v->redMask   == 0xf800
 249              && v->greenMask == 0x07e0
 250              && v->blueMask  == 0x001f)
 251         return PF_R5G6B5;
 252     else if (depth == 8
 253              && v->redMask   == 0x07
 254              && v->greenMask == 0x38
 255              && v->blueMask  == 0xc0)
 256         return PF_R3G3B2;
 257
 258     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 259     return 0;
 260 }
 261
 262 static void
 263 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 264 {
 265     TRACE;
 266
 267     free(rb->Data);
 268     free(rb);
 269 }
 270
 271 /* see bytes_per_line in libGL */
 272 static INLINE int
 273 bytes_per_line(unsigned pitch_bits, unsigned mul)
 274 {
 275    unsigned mask = mul - 1;
 276
 277    return ((pitch_bits + mask) & ~mask) / 8;
 278 }
 279
 280 static GLboolean
 281 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 282                            GLenum internalFormat, GLuint width, GLuint height)
 283 {
 284     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 285
 286     TRACE;
 287
 288     rb->Data = NULL;
 289     rb->Width = width;
 290     rb->Height = height;
 291
 292     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 293
 294     return GL_TRUE;
 295 }
 296
 297 static GLboolean
 298 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 299                           GLenum internalFormat, GLuint width, GLuint height)
 300 {
 301     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 302
 303     TRACE;
 304
 305     free(rb->Data);
 306
 307     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 308
 309     rb->Data = malloc(height * xrb->pitch);
 310
 311     return GL_TRUE;
 312 }
 313
 314 static struct swrast_renderbuffer *
 315 swrast_new_renderbuffer(const struct gl_config *visual, GLboolean front)
 316 {
 317     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 318     GLuint pixel_format;
 319
 320     TRACE;
 321
 322     if (!xrb)
 323         return NULL;
 324
 325     _mesa_init_renderbuffer(&xrb->Base, 0);
 326
 327     pixel_format = choose_pixel_format(visual);
 328
 329     xrb->Base.Delete = swrast_delete_renderbuffer;
 330     if (front) {
 331         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 332         swrast_set_span_funcs_front(xrb, pixel_format);
 333     }
 334     else {
 335         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 336         swrast_set_span_funcs_back(xrb, pixel_format);
 337     }
 338
 339     switch (pixel_format) {
 340     case PF_A8R8G8B8:
 341         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 342         xrb->Base.InternalFormat = GL_RGBA;
 343         xrb->Base._BaseFormat = GL_RGBA;
 344         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 345         xrb->bpp = 32;
 346         break;
 347     case PF_X8R8G8B8:
 348         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 349         xrb->Base.InternalFormat = GL_RGB;
 350         xrb->Base._BaseFormat = GL_RGB;
 351         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 352         xrb->bpp = 32;
 353         break;
 354     case PF_R8G8B8:
 355         xrb->Base.Format = MESA_FORMAT_RGB888;
 356         xrb->Base.InternalFormat = GL_RGB;
 357         xrb->Base._BaseFormat = GL_RGB;
 358         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 359         xrb->bpp = 24;
 360         break;
 361     case PF_R5G6B5:
 362         xrb->Base.Format = MESA_FORMAT_RGB565;
 363         xrb->Base.InternalFormat = GL_RGB;
 364         xrb->Base._BaseFormat = GL_RGB;
 365         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 366         xrb->bpp = 16;
 367         break;
 368     case PF_R3G3B2:
 369         xrb->Base.Format = MESA_FORMAT_RGB332;
 370         xrb->Base.InternalFormat = GL_RGB;
 371         xrb->Base._BaseFormat = GL_RGB;
 372         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 373         xrb->bpp = 8;
 374         break;
 375     default:
 376         return NULL;
 377     }
 378
 379     return xrb;
 380 }
 381
 382 static GLboolean
 383 dri_create_buffer(__DRIscreen * sPriv,
 384                   __DRIdrawable * dPriv,
 385                   const struct gl_config * visual, GLboolean isPixmap)
 386 {
 387     struct dri_drawable *drawable = NULL;
 388     struct gl_framebuffer *fb;
 389     struct swrast_renderbuffer *frontrb, *backrb;
 390
 391     TRACE;
 392
 393     drawable = CALLOC_STRUCT(dri_drawable);
 394     if (drawable == NULL)
 395         goto drawable_fail;
 396
 397     dPriv->driverPrivate = drawable;
 398     drawable->dPriv = dPriv;
 399
 400     drawable->row = malloc(MAX_WIDTH * 4);
 401     if (drawable->row == NULL)
 402         goto drawable_fail;
 403
 404     fb = &drawable->Base;
 405
 406     /* basic framebuffer setup */
 407     _mesa_initialize_window_framebuffer(fb, visual);
 408
 409     /* add front renderbuffer */
 410     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 411     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 412
 413     /* add back renderbuffer */
 414     if (visual->doubleBufferMode) {
 415         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 416         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 417     }
 418
 419     /* add software renderbuffers */
 420     _mesa_add_soft_renderbuffers(fb,
 421                                  GL_FALSE, /* color */
 422                                  visual->haveDepthBuffer,
 423                                  visual->haveStencilBuffer,
 424                                  visual->haveAccumBuffer,
 425                                  GL_FALSE, /* alpha */
 426                                  GL_FALSE /* aux bufs */);
 427
 428     return GL_TRUE;
 429
 430 drawable_fail:
 431
 432     if (drawable)
 433         free(drawable->row);
 434
 435     FREE(drawable);
 436
 437     return GL_FALSE;
 438 }
 439
 440 static void
 441 dri_destroy_buffer(__DRIdrawable * dPriv)
 442 {
 443     TRACE;
 444
 445     if (dPriv) {
 446         struct dri_drawable *drawable = dri_drawable(dPriv);
 447         struct gl_framebuffer *fb;
 448
 449         free(drawable->row);
 450
 451         fb = &drawable->Base;
 452
 453         fb->DeletePending = GL_TRUE;
 454         _mesa_reference_framebuffer(&fb, NULL);
 455     }
 456 }
 457
 458 static void
 459 dri_swap_buffers(__DRIdrawable * dPriv)
 460 {
 461     __DRIscreen *sPriv = dPriv->driScreenPriv;
 462
 463     GET_CURRENT_CONTEXT(ctx);
 464
 465     struct dri_drawable *drawable = dri_drawable(dPriv);
 466     struct gl_framebuffer *fb;
 467     struct swrast_renderbuffer *frontrb, *backrb;
 468
 469     TRACE;
 470
 471     fb = &drawable->Base;
 472
 473     frontrb =
 474         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 475     backrb =
 476         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 477
 478     /* check for signle-buffered */
 479     if (backrb == NULL)
 480         return;
 481
 482     /* check if swapping currently bound buffer */
 483     if (ctx && ctx->DrawBuffer == fb) {
 484         /* flush pending rendering */
 485         _mesa_notifySwapBuffers(ctx);
 486     }
 487
 488     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 489                                    0, 0,
 490                                    frontrb->Base.Width,
 491                                    frontrb->Base.Height,
 492                                    backrb->Base.Data,
 493                                    dPriv->loaderPrivate);
 494 }
 495
 496
 497 /**
 498  * General device driver functions.
 499  */
 500
 501 static void
 502 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 503 {
 504     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 505     __DRIscreen *sPriv = dPriv->driScreenPriv;
 506     int x, y;
 507
 508     sPriv->swrast_loader->getDrawableInfo(dPriv,
 509                                           &x, &y, w, h,
 510                                           dPriv->loaderPrivate);
 511 }
 512
 513 static void
 514 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 515 {
 516     GLsizei width, height;
 517
 518     get_window_size(fb, &width, &height);
 519     if (fb->Width != width || fb->Height != height) {
 520         _mesa_resize_framebuffer(ctx, fb, width, height);
 521     }
 522 }
 523
 524 static const GLubyte *
 525 get_string(struct gl_context *ctx, GLenum pname)
 526 {
 527     (void) ctx;
 528     switch (pname) {
 529         case GL_VENDOR:
 530             return (const GLubyte *) "Mesa Project";
 531         case GL_RENDERER:
 532             return (const GLubyte *) "Software Rasterizer";
 533         default:
 534             return NULL;
 535     }
 536 }
 537
 538 static void
 539 update_state( struct gl_context *ctx, GLuint new_state )
 540 {
 541     /* not much to do here - pass it on */
 542     _swrast_InvalidateState( ctx, new_state );
 543     _swsetup_InvalidateState( ctx, new_state );
 544     _vbo_InvalidateState( ctx, new_state );
 545     _tnl_InvalidateState( ctx, new_state );
 546 }
 547
 548 static void
 549 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 550 {
 551     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 552     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 553
 554     swrast_check_and_update_window_size(ctx, draw);
 555     swrast_check_and_update_window_size(ctx, read);
 556 }
 557
 558 static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
 559                                            GLint internalFormat,
 560                                            GLenum format,
 561                                            GLenum type)
 562 {
 563     if (internalFormat == GL_RGB)
 564         return MESA_FORMAT_XRGB8888;
 565     return _mesa_choose_tex_format(ctx, internalFormat, format, type);
 566 }
 567
 568 static void
 569 swrast_init_driver_functions(struct dd_function_table *driver)
 570 {
 571     driver->GetString = get_string;
 572     driver->UpdateState = update_state;
 573     driver->GetBufferSize = NULL;
 574     driver->Viewport = viewport;
 575     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 576 }
 577
 578 static const char *es2_extensions[] = {
 579    /* Used by mesa internally (cf all_mesa_extensions in ../common/utils.c) */
 580    "GL_ARB_draw_buffers",
 581    "GL_ARB_multisample",
 582    "GL_ARB_texture_compression",
 583    "GL_ARB_transpose_matrix",
 584    "GL_ARB_vertex_buffer_object",
 585    "GL_ARB_window_pos",
 586    "GL_EXT_blend_func_separate",
 587    "GL_EXT_compiled_vertex_array",
 588    "GL_EXT_framebuffer_blit",
 589    "GL_EXT_multi_draw_arrays",
 590    "GL_EXT_polygon_offset",
 591    "GL_EXT_texture_object",
 592    "GL_EXT_vertex_array",
 593    "GL_IBM_multimode_draw_arrays",
 594    "GL_MESA_window_pos",
 595    "GL_NV_vertex_program",
 596
 597    /* Required by GLES2 */
 598    "GL_ARB_fragment_program",
 599    "GL_ARB_fragment_shader",
 600    "GL_ARB_multitexture",
 601    "GL_ARB_shader_objects",
 602    "GL_ARB_texture_cube_map",
 603    "GL_ARB_texture_mirrored_repeat",
 604    "GL_ARB_texture_non_power_of_two",
 605    "GL_ARB_vertex_shader",
 606    "GL_EXT_blend_color",
 607    "GL_EXT_blend_equation_separate",
 608    "GL_EXT_blend_minmax",
 609    "GL_EXT_blend_subtract",
 610    "GL_EXT_stencil_wrap",
 611
 612    /* Optional GLES2 */
 613    "GL_ARB_framebuffer_object",
 614    "GL_EXT_texture_filter_anisotropic",
 615    "GL_ARB_depth_texture",
 616    "GL_EXT_packed_depth_stencil",
 617    "GL_EXT_framebuffer_object",
 618    NULL,
 619 };
 620
 621 static void
 622 InitExtensionsES2(struct gl_context *ctx)
 623 {
 624    int i;
 625
 626    /* Can't use driInitExtensions() since it uses extensions from
 627     * main/remap_helper.h when called the first time. */
 628
 629    for (i = 0; es2_extensions[i]; i++)
 630       _mesa_enable_extension(ctx, es2_extensions[i]);
 631 }
 632
 633 /**
 634  * Context-related functions.
 635  */
 636
 637 static GLboolean
 638 dri_create_context(gl_api api,
 639                    const struct gl_config * visual,
 640                    __DRIcontext * cPriv, void *sharedContextPrivate)
 641 {
 642     struct dri_context *ctx = NULL;
 643     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 644     struct gl_context *mesaCtx = NULL;
 645     struct gl_context *sharedCtx = NULL;
 646     struct dd_function_table functions;
 647
 648     TRACE;
 649
 650     ctx = CALLOC_STRUCT(dri_context);
 651     if (ctx == NULL)
 652         goto context_fail;
 653
 654     cPriv->driverPrivate = ctx;
 655     ctx->cPriv = cPriv;
 656
 657     /* build table of device driver functions */
 658     _mesa_init_driver_functions(&functions);
 659     swrast_init_driver_functions(&functions);
 660
 661     if (share) {
 662         sharedCtx = &share->Base;
 663     }
 664
 665     mesaCtx = &ctx->Base;
 666
 667     /* basic context setup */
 668     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions, (void *) cPriv)) {
 669         goto context_fail;
 670     }
 671
 672     /* do bounds checking to prevent segfaults and server crashes! */
 673     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 674
 675     /* create module contexts */
 676     _swrast_CreateContext( mesaCtx );
 677     _vbo_CreateContext( mesaCtx );
 678     _tnl_CreateContext( mesaCtx );
 679     _swsetup_CreateContext( mesaCtx );
 680     _swsetup_Wakeup( mesaCtx );
 681
 682     /* use default TCL pipeline */
 683     {
 684        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 685        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 686     }
 687
 688     _mesa_meta_init(mesaCtx);
 689     _mesa_enable_sw_extensions(mesaCtx);
 690
 691     switch (api) {
 692     case API_OPENGL:
 693         _mesa_enable_1_3_extensions(mesaCtx);
 694         _mesa_enable_1_4_extensions(mesaCtx);
 695         _mesa_enable_1_5_extensions(mesaCtx);
 696         _mesa_enable_2_0_extensions(mesaCtx);
 697         _mesa_enable_2_1_extensions(mesaCtx);
 698
 699         driInitExtensions( mesaCtx, NULL, GL_FALSE );
 700         break;
 701     case API_OPENGLES:
 702         _mesa_enable_1_3_extensions(mesaCtx);
 703         _mesa_enable_1_4_extensions(mesaCtx);
 704         _mesa_enable_1_5_extensions(mesaCtx);
 705
 706         break;
 707     case API_OPENGLES2:
 708         InitExtensionsES2( mesaCtx);
 709         break;
 710     }
 711
 712     return GL_TRUE;
 713
 714 context_fail:
 715
 716     FREE(ctx);
 717
 718     return GL_FALSE;
 719 }
 720
 721 static void
 722 dri_destroy_context(__DRIcontext * cPriv)
 723 {
 724     TRACE;
 725
 726     if (cPriv) {
 727         struct dri_context *ctx = dri_context(cPriv);
 728         struct gl_context *mesaCtx;
 729
 730         mesaCtx = &ctx->Base;
 731
 732         _mesa_meta_free(mesaCtx);
 733         _swsetup_DestroyContext( mesaCtx );
 734         _swrast_DestroyContext( mesaCtx );
 735         _tnl_DestroyContext( mesaCtx );
 736         _vbo_DestroyContext( mesaCtx );
 737         _mesa_destroy_context( mesaCtx );
 738     }
 739 }
 740
 741 static GLboolean
 742 dri_make_current(__DRIcontext * cPriv,
 743                  __DRIdrawable * driDrawPriv,
 744                  __DRIdrawable * driReadPriv)
 745 {
 746     struct gl_context *mesaCtx;
 747     struct gl_framebuffer *mesaDraw;
 748     struct gl_framebuffer *mesaRead;
 749     TRACE;
 750
 751     if (cPriv) {
 752         struct dri_context *ctx = dri_context(cPriv);
 753         struct dri_drawable *draw;
 754         struct dri_drawable *read;
 755
 756         if (!driDrawPriv || !driReadPriv)
 757             return GL_FALSE;
 758
 759         draw = dri_drawable(driDrawPriv);
 760         read = dri_drawable(driReadPriv);
 761         mesaCtx = &ctx->Base;
 762         mesaDraw = &draw->Base;
 763         mesaRead = &read->Base;
 764
 765         /* check for same context and buffer */
 766         if (mesaCtx == _mesa_get_current_context()
 767             && mesaCtx->DrawBuffer == mesaDraw
 768             && mesaCtx->ReadBuffer == mesaRead) {
 769             return GL_TRUE;
 770         }
 771
 772         _glapi_check_multithread();
 773
 774         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 775         if (mesaRead != mesaDraw)
 776             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 777
 778         _mesa_make_current( mesaCtx,
 779                             mesaDraw,
 780                             mesaRead );
 781     }
 782     else {
 783         /* unbind */
 784         _mesa_make_current( NULL, NULL, NULL );
 785     }
 786
 787     return GL_TRUE;
 788 }
 789
 790 static GLboolean
 791 dri_unbind_context(__DRIcontext * cPriv)
 792 {
 793     TRACE;
 794     (void) cPriv;
 795
 796     /* Unset current context and dispath table */
 797     _mesa_make_current(NULL, NULL, NULL);
 798
 799     return GL_TRUE;
 800 }
 801
 802
 803 const struct __DriverAPIRec driDriverAPI = {
 804     .InitScreen = dri_init_screen,
 805     .DestroyScreen = dri_destroy_screen,
 806     .CreateContext = dri_create_context,
 807     .DestroyContext = dri_destroy_context,
 808     .CreateBuffer = dri_create_buffer,
 809     .DestroyBuffer = dri_destroy_buffer,
 810     .SwapBuffers = dri_swap_buffers,
 811     .MakeCurrent = dri_make_current,
 812     .UnbindContext = dri_unbind_context,
 813 };
 814
 815 /* This is the table of extensions that the loader will dlsym() for. */
 816 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 817     &driCoreExtension.base,
 818     &driSWRastExtension.base,
 819     NULL
 820 };