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/texfetch.h"
  52 #include "main/texformat.h"
  53 #include "main/texstate.h"
  54
  55 #include "swrast_priv.h"
  56
  57
  58 /**
  59  * Screen and config-related functions
  60  */
  61
  62 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  63                                 GLint texture_format, __DRIdrawable *dPriv)
  64 {
  65     struct dri_context *dri_ctx;
  66     int x, y, w, h;
  67     __DRIscreen *sPriv = dPriv->driScreenPriv;
  68     struct gl_texture_unit *texUnit;
  69     struct gl_texture_object *texObj;
  70     struct gl_texture_image *texImage;
  71     uint32_t internalFormat;
  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     _mesa_init_teximage_fields(&dri_ctx->Base, target, texImage,
  86                                w, h, 1, 0, internalFormat);
  87
  88     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  89         texImage->TexFormat = MESA_FORMAT_XRGB8888;
  90     else
  91         texImage->TexFormat = MESA_FORMAT_ARGB8888;
  92
  93     _mesa_set_fetch_functions(texImage, 2);
  94
  95     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)texImage->Data,
  96                                    dPriv->loaderPrivate);
  97
  98     _mesa_unlock_texture(&dri_ctx->Base, texObj);
  99 }
 100
 101 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 102                                __DRIdrawable *dPriv)
 103 {
 104     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 105 }
 106
 107 static const __DRItexBufferExtension swrastTexBufferExtension = {
 108     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 109     swrastSetTexBuffer,
 110     swrastSetTexBuffer2,
 111 };
 112
 113 static const __DRIextension *dri_screen_extensions[] = {
 114     &swrastTexBufferExtension.base,
 115     NULL
 116 };
 117
 118 static __DRIconfig **
 119 swrastFillInModes(__DRIscreen *psp,
 120                   unsigned pixel_bits, unsigned depth_bits,
 121                   unsigned stencil_bits, GLboolean have_back_buffer)
 122 {
 123     __DRIconfig **configs;
 124     unsigned depth_buffer_factor;
 125     unsigned back_buffer_factor;
 126     GLenum fb_format;
 127     GLenum fb_type;
 128
 129     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 130      * support pageflipping at all.
 131      */
 132     static const GLenum back_buffer_modes[] = {
 133         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 134     };
 135
 136     uint8_t depth_bits_array[4];
 137     uint8_t stencil_bits_array[4];
 138     uint8_t msaa_samples_array[1];
 139
 140     depth_bits_array[0] = 0;
 141     depth_bits_array[1] = 0;
 142     depth_bits_array[2] = depth_bits;
 143     depth_bits_array[3] = depth_bits;
 144
 145     /* Just like with the accumulation buffer, always provide some modes
 146      * with a stencil buffer.
 147      */
 148     stencil_bits_array[0] = 0;
 149     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 150     stencil_bits_array[2] = 0;
 151     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 152
 153     msaa_samples_array[0] = 0;
 154
 155     depth_buffer_factor = 4;
 156     back_buffer_factor = 2;
 157
 158     switch (pixel_bits) {
 159     case 8:
 160         fb_format = GL_RGB;
 161         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 162         break;
 163     case 16:
 164         fb_format = GL_RGB;
 165         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 166         break;
 167     case 24:
 168         fb_format = GL_BGR;
 169         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 170         break;
 171     case 32:
 172         fb_format = GL_BGRA;
 173         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 174         break;
 175     default:
 176         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 177                 pixel_bits);
 178         return NULL;
 179     }
 180
 181     configs = driCreateConfigs(fb_format, fb_type,
 182                                depth_bits_array, stencil_bits_array,
 183                                depth_buffer_factor, back_buffer_modes,
 184                                back_buffer_factor, msaa_samples_array, 1,
 185                                GL_TRUE);
 186     if (configs == NULL) {
 187         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 188                 __LINE__);
 189         return NULL;
 190     }
 191
 192     return configs;
 193 }
 194
 195 static const __DRIconfig **
 196 dri_init_screen(__DRIscreen * psp)
 197 {
 198     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 199
 200     TRACE;
 201
 202     psp->extensions = dri_screen_extensions;
 203
 204     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 205     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 206     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 207     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 208
 209     configs16 = driConcatConfigs(configs8, configs16);
 210     configs24 = driConcatConfigs(configs16, configs24);
 211     configs32 = driConcatConfigs(configs24, configs32);
 212
 213     return (const __DRIconfig **)configs32;
 214 }
 215
 216 static void
 217 dri_destroy_screen(__DRIscreen * sPriv)
 218 {
 219     TRACE;
 220 }
 221
 222
 223 /**
 224  * Framebuffer and renderbuffer-related functions.
 225  */
 226
 227 static GLuint
 228 choose_pixel_format(const struct gl_config *v)
 229 {
 230     int depth = v->rgbBits;
 231
 232     if (depth == 32
 233         && v->redMask   == 0xff0000
 234         && v->greenMask == 0x00ff00
 235         && v->blueMask  == 0x0000ff)
 236         return PF_A8R8G8B8;
 237     else if (depth == 24
 238              && v->redMask   == 0xff0000
 239              && v->greenMask == 0x00ff00
 240              && v->blueMask  == 0x0000ff)
 241         return PF_X8R8G8B8;
 242     else if (depth == 16
 243              && v->redMask   == 0xf800
 244              && v->greenMask == 0x07e0
 245              && v->blueMask  == 0x001f)
 246         return PF_R5G6B5;
 247     else if (depth == 8
 248              && v->redMask   == 0x07
 249              && v->greenMask == 0x38
 250              && v->blueMask  == 0xc0)
 251         return PF_R3G3B2;
 252
 253     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 254     return 0;
 255 }
 256
 257 static void
 258 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 259 {
 260     TRACE;
 261
 262     free(rb->Data);
 263     free(rb);
 264 }
 265
 266 /* see bytes_per_line in libGL */
 267 static INLINE int
 268 bytes_per_line(unsigned pitch_bits, unsigned mul)
 269 {
 270    unsigned mask = mul - 1;
 271
 272    return ((pitch_bits + mask) & ~mask) / 8;
 273 }
 274
 275 static GLboolean
 276 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 277                            GLenum internalFormat, GLuint width, GLuint height)
 278 {
 279     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 280
 281     TRACE;
 282
 283     rb->Data = NULL;
 284     rb->Width = width;
 285     rb->Height = height;
 286
 287     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 288
 289     return GL_TRUE;
 290 }
 291
 292 static GLboolean
 293 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 294                           GLenum internalFormat, GLuint width, GLuint height)
 295 {
 296     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 297
 298     TRACE;
 299
 300     free(rb->Data);
 301
 302     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 303
 304     rb->Data = malloc(height * xrb->pitch);
 305
 306     return GL_TRUE;
 307 }
 308
 309 static struct swrast_renderbuffer *
 310 swrast_new_renderbuffer(const struct gl_config *visual, GLboolean front)
 311 {
 312     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 313     GLuint pixel_format;
 314
 315     TRACE;
 316
 317     if (!xrb)
 318         return NULL;
 319
 320     _mesa_init_renderbuffer(&xrb->Base, 0);
 321
 322     pixel_format = choose_pixel_format(visual);
 323
 324     xrb->Base.Delete = swrast_delete_renderbuffer;
 325     if (front) {
 326         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 327         swrast_set_span_funcs_front(xrb, pixel_format);
 328     }
 329     else {
 330         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 331         swrast_set_span_funcs_back(xrb, pixel_format);
 332     }
 333
 334     switch (pixel_format) {
 335     case PF_A8R8G8B8:
 336         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 337         xrb->Base.InternalFormat = GL_RGBA;
 338         xrb->Base._BaseFormat = GL_RGBA;
 339         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 340         xrb->bpp = 32;
 341         break;
 342     case PF_X8R8G8B8:
 343         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 344         xrb->Base.InternalFormat = GL_RGB;
 345         xrb->Base._BaseFormat = GL_RGB;
 346         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 347         xrb->bpp = 32;
 348         break;
 349     case PF_R5G6B5:
 350         xrb->Base.Format = MESA_FORMAT_RGB565;
 351         xrb->Base.InternalFormat = GL_RGB;
 352         xrb->Base._BaseFormat = GL_RGB;
 353         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 354         xrb->bpp = 16;
 355         break;
 356     case PF_R3G3B2:
 357         xrb->Base.Format = MESA_FORMAT_RGB332;
 358         xrb->Base.InternalFormat = GL_RGB;
 359         xrb->Base._BaseFormat = GL_RGB;
 360         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 361         xrb->bpp = 8;
 362         break;
 363     default:
 364         return NULL;
 365     }
 366
 367     return xrb;
 368 }
 369
 370 static GLboolean
 371 dri_create_buffer(__DRIscreen * sPriv,
 372                   __DRIdrawable * dPriv,
 373                   const struct gl_config * visual, GLboolean isPixmap)
 374 {
 375     struct dri_drawable *drawable = NULL;
 376     struct gl_framebuffer *fb;
 377     struct swrast_renderbuffer *frontrb, *backrb;
 378
 379     TRACE;
 380
 381     drawable = CALLOC_STRUCT(dri_drawable);
 382     if (drawable == NULL)
 383         goto drawable_fail;
 384
 385     dPriv->driverPrivate = drawable;
 386     drawable->dPriv = dPriv;
 387
 388     drawable->row = malloc(MAX_WIDTH * 4);
 389     if (drawable->row == NULL)
 390         goto drawable_fail;
 391
 392     fb = &drawable->Base;
 393
 394     /* basic framebuffer setup */
 395     _mesa_initialize_window_framebuffer(fb, visual);
 396
 397     /* add front renderbuffer */
 398     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 399     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 400
 401     /* add back renderbuffer */
 402     if (visual->doubleBufferMode) {
 403         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 404         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 405     }
 406
 407     /* add software renderbuffers */
 408     _mesa_add_soft_renderbuffers(fb,
 409                                  GL_FALSE, /* color */
 410                                  visual->haveDepthBuffer,
 411                                  visual->haveStencilBuffer,
 412                                  visual->haveAccumBuffer,
 413                                  GL_FALSE, /* alpha */
 414                                  GL_FALSE /* aux bufs */);
 415
 416     return GL_TRUE;
 417
 418 drawable_fail:
 419
 420     if (drawable)
 421         free(drawable->row);
 422
 423     FREE(drawable);
 424
 425     return GL_FALSE;
 426 }
 427
 428 static void
 429 dri_destroy_buffer(__DRIdrawable * dPriv)
 430 {
 431     TRACE;
 432
 433     if (dPriv) {
 434         struct dri_drawable *drawable = dri_drawable(dPriv);
 435         struct gl_framebuffer *fb;
 436
 437         free(drawable->row);
 438
 439         fb = &drawable->Base;
 440
 441         fb->DeletePending = GL_TRUE;
 442         _mesa_reference_framebuffer(&fb, NULL);
 443     }
 444 }
 445
 446 static void
 447 dri_swap_buffers(__DRIdrawable * dPriv)
 448 {
 449     __DRIscreen *sPriv = dPriv->driScreenPriv;
 450
 451     GET_CURRENT_CONTEXT(ctx);
 452
 453     struct dri_drawable *drawable = dri_drawable(dPriv);
 454     struct gl_framebuffer *fb;
 455     struct swrast_renderbuffer *frontrb, *backrb;
 456
 457     TRACE;
 458
 459     fb = &drawable->Base;
 460
 461     frontrb =
 462         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 463     backrb =
 464         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 465
 466     /* check for signle-buffered */
 467     if (backrb == NULL)
 468         return;
 469
 470     /* check if swapping currently bound buffer */
 471     if (ctx && ctx->DrawBuffer == fb) {
 472         /* flush pending rendering */
 473         _mesa_notifySwapBuffers(ctx);
 474     }
 475
 476     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 477                                    0, 0,
 478                                    frontrb->Base.Width,
 479                                    frontrb->Base.Height,
 480                                    backrb->Base.Data,
 481                                    dPriv->loaderPrivate);
 482 }
 483
 484
 485 /**
 486  * General device driver functions.
 487  */
 488
 489 static void
 490 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 491 {
 492     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 493     __DRIscreen *sPriv = dPriv->driScreenPriv;
 494     int x, y;
 495
 496     sPriv->swrast_loader->getDrawableInfo(dPriv,
 497                                           &x, &y, w, h,
 498                                           dPriv->loaderPrivate);
 499 }
 500
 501 static void
 502 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 503 {
 504     GLsizei width, height;
 505
 506     get_window_size(fb, &width, &height);
 507     if (fb->Width != width || fb->Height != height) {
 508         _mesa_resize_framebuffer(ctx, fb, width, height);
 509     }
 510 }
 511
 512 static const GLubyte *
 513 get_string(struct gl_context *ctx, GLenum pname)
 514 {
 515     (void) ctx;
 516     switch (pname) {
 517         case GL_VENDOR:
 518             return (const GLubyte *) "Mesa Project";
 519         case GL_RENDERER:
 520             return (const GLubyte *) "Software Rasterizer";
 521         default:
 522             return NULL;
 523     }
 524 }
 525
 526 static void
 527 update_state( struct gl_context *ctx, GLuint new_state )
 528 {
 529     /* not much to do here - pass it on */
 530     _swrast_InvalidateState( ctx, new_state );
 531     _swsetup_InvalidateState( ctx, new_state );
 532     _vbo_InvalidateState( ctx, new_state );
 533     _tnl_InvalidateState( ctx, new_state );
 534 }
 535
 536 static void
 537 viewport(struct gl_context *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 538 {
 539     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 540     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 541
 542     swrast_check_and_update_window_size(ctx, draw);
 543     swrast_check_and_update_window_size(ctx, read);
 544 }
 545
 546 static gl_format swrastChooseTextureFormat(struct gl_context * ctx,
 547                                            GLint internalFormat,
 548                                            GLenum format,
 549                                            GLenum type)
 550 {
 551     if (internalFormat == GL_RGB)
 552         return MESA_FORMAT_XRGB8888;
 553     return _mesa_choose_tex_format(ctx, internalFormat, format, type);
 554 }
 555
 556 static void
 557 swrast_init_driver_functions(struct dd_function_table *driver)
 558 {
 559     driver->GetString = get_string;
 560     driver->UpdateState = update_state;
 561     driver->GetBufferSize = NULL;
 562     driver->Viewport = viewport;
 563     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 564 }
 565
 566
 567 /**
 568  * Context-related functions.
 569  */
 570
 571 static GLboolean
 572 dri_create_context(gl_api api,
 573                    const struct gl_config * visual,
 574                    __DRIcontext * cPriv, void *sharedContextPrivate)
 575 {
 576     struct dri_context *ctx = NULL;
 577     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 578     struct gl_context *mesaCtx = NULL;
 579     struct gl_context *sharedCtx = NULL;
 580     struct dd_function_table functions;
 581
 582     TRACE;
 583
 584     ctx = CALLOC_STRUCT(dri_context);
 585     if (ctx == NULL)
 586         goto context_fail;
 587
 588     cPriv->driverPrivate = ctx;
 589     ctx->cPriv = cPriv;
 590
 591     /* build table of device driver functions */
 592     _mesa_init_driver_functions(&functions);
 593     swrast_init_driver_functions(&functions);
 594
 595     if (share) {
 596         sharedCtx = &share->Base;
 597     }
 598
 599     mesaCtx = &ctx->Base;
 600
 601     /* basic context setup */
 602     if (!_mesa_initialize_context(mesaCtx, visual, sharedCtx, &functions, (void *) cPriv)) {
 603         goto context_fail;
 604     }
 605
 606     /* do bounds checking to prevent segfaults and server crashes! */
 607     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 608
 609     /* create module contexts */
 610     _swrast_CreateContext( mesaCtx );
 611     _vbo_CreateContext( mesaCtx );
 612     _tnl_CreateContext( mesaCtx );
 613     _swsetup_CreateContext( mesaCtx );
 614     _swsetup_Wakeup( mesaCtx );
 615
 616     /* use default TCL pipeline */
 617     {
 618        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 619        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 620     }
 621
 622     _mesa_enable_sw_extensions(mesaCtx);
 623     _mesa_enable_1_3_extensions(mesaCtx);
 624     _mesa_enable_1_4_extensions(mesaCtx);
 625     _mesa_enable_1_5_extensions(mesaCtx);
 626     _mesa_enable_2_0_extensions(mesaCtx);
 627     _mesa_enable_2_1_extensions(mesaCtx);
 628
 629     _mesa_meta_init(mesaCtx);
 630
 631     driInitExtensions( mesaCtx, NULL, GL_FALSE );
 632
 633     return GL_TRUE;
 634
 635 context_fail:
 636
 637     FREE(ctx);
 638
 639     return GL_FALSE;
 640 }
 641
 642 static void
 643 dri_destroy_context(__DRIcontext * cPriv)
 644 {
 645     TRACE;
 646
 647     if (cPriv) {
 648         struct dri_context *ctx = dri_context(cPriv);
 649         struct gl_context *mesaCtx;
 650
 651         mesaCtx = &ctx->Base;
 652
 653         _mesa_meta_free(mesaCtx);
 654         _swsetup_DestroyContext( mesaCtx );
 655         _swrast_DestroyContext( mesaCtx );
 656         _tnl_DestroyContext( mesaCtx );
 657         _vbo_DestroyContext( mesaCtx );
 658         _mesa_destroy_context( mesaCtx );
 659     }
 660 }
 661
 662 static GLboolean
 663 dri_make_current(__DRIcontext * cPriv,
 664                  __DRIdrawable * driDrawPriv,
 665                  __DRIdrawable * driReadPriv)
 666 {
 667     struct gl_context *mesaCtx;
 668     struct gl_framebuffer *mesaDraw;
 669     struct gl_framebuffer *mesaRead;
 670     TRACE;
 671
 672     if (cPriv) {
 673         struct dri_context *ctx = dri_context(cPriv);
 674         struct dri_drawable *draw;
 675         struct dri_drawable *read;
 676
 677         if (!driDrawPriv || !driReadPriv)
 678             return GL_FALSE;
 679
 680         draw = dri_drawable(driDrawPriv);
 681         read = dri_drawable(driReadPriv);
 682         mesaCtx = &ctx->Base;
 683         mesaDraw = &draw->Base;
 684         mesaRead = &read->Base;
 685
 686         /* check for same context and buffer */
 687         if (mesaCtx == _mesa_get_current_context()
 688             && mesaCtx->DrawBuffer == mesaDraw
 689             && mesaCtx->ReadBuffer == mesaRead) {
 690             return GL_TRUE;
 691         }
 692
 693         _glapi_check_multithread();
 694
 695         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 696         if (mesaRead != mesaDraw)
 697             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 698
 699         _mesa_make_current( mesaCtx,
 700                             mesaDraw,
 701                             mesaRead );
 702     }
 703     else {
 704         /* unbind */
 705         _mesa_make_current( NULL, NULL, NULL );
 706     }
 707
 708     return GL_TRUE;
 709 }
 710
 711 static GLboolean
 712 dri_unbind_context(__DRIcontext * cPriv)
 713 {
 714     TRACE;
 715     (void) cPriv;
 716
 717     /* Unset current context and dispath table */
 718     _mesa_make_current(NULL, NULL, NULL);
 719
 720     return GL_TRUE;
 721 }
 722
 723
 724 const struct __DriverAPIRec driDriverAPI = {
 725     .InitScreen = dri_init_screen,
 726     .DestroyScreen = dri_destroy_screen,
 727     .CreateContext = dri_create_context,
 728     .DestroyContext = dri_destroy_context,
 729     .CreateBuffer = dri_create_buffer,
 730     .DestroyBuffer = dri_destroy_buffer,
 731     .SwapBuffers = dri_swap_buffers,
 732     .MakeCurrent = dri_make_current,
 733     .UnbindContext = dri_unbind_context,
 734 };
 735
 736 /* This is the table of extensions that the loader will dlsym() for. */
 737 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 738     &driCoreExtension.base,
 739     &driSWRastExtension.base,
 740     NULL
 741 };