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 #include "main/texobj.h"
  55
  56 #include "swrast_priv.h"
  57
  58
  59 /**
  60  * Screen and config-related functions
  61  */
  62
  63 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  64                                 GLint texture_format, __DRIdrawable *dPriv)
  65 {
  66     struct dri_context *dri_ctx;
  67     int x, y, w, h;
  68     __DRIscreen *sPriv = dPriv->driScreenPriv;
  69     struct gl_texture_unit *texUnit;
  70     struct gl_texture_object *texObj;
  71     struct gl_texture_image *texImage;
  72     uint32_t internalFormat;
  73
  74     dri_ctx = pDRICtx->driverPrivate;
  75
  76     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  77
  78     texUnit = _mesa_get_current_tex_unit(&dri_ctx->Base);
  79     texObj = _mesa_select_tex_object(&dri_ctx->Base, texUnit, target);
  80     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  81
  82     _mesa_lock_texture(&dri_ctx->Base, texObj);
  83
  84     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
  85
  86     _mesa_init_teximage_fields(&dri_ctx->Base, target, texImage,
  87                                w, h, 1, 0, internalFormat);
  88
  89     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  90         texImage->TexFormat = MESA_FORMAT_XRGB8888;
  91     else
  92         texImage->TexFormat = MESA_FORMAT_ARGB8888;
  93
  94     _mesa_set_fetch_functions(texImage, 2);
  95
  96     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)texImage->Data,
  97                                    dPriv->loaderPrivate);
  98
  99     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 100 }
 101
 102 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 103                                __DRIdrawable *dPriv)
 104 {
 105     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 106 }
 107
 108 static const __DRItexBufferExtension swrastTexBufferExtension = {
 109     { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
 110     swrastSetTexBuffer,
 111     swrastSetTexBuffer2,
 112 };
 113
 114 static const __DRIextension *dri_screen_extensions[] = {
 115     &swrastTexBufferExtension.base,
 116     NULL
 117 };
 118
 119 static __DRIconfig **
 120 swrastFillInModes(__DRIscreen *psp,
 121                   unsigned pixel_bits, unsigned depth_bits,
 122                   unsigned stencil_bits, GLboolean have_back_buffer)
 123 {
 124     __DRIconfig **configs;
 125     unsigned depth_buffer_factor;
 126     unsigned back_buffer_factor;
 127     GLenum fb_format;
 128     GLenum fb_type;
 129
 130     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 131      * support pageflipping at all.
 132      */
 133     static const GLenum back_buffer_modes[] = {
 134         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 135     };
 136
 137     uint8_t depth_bits_array[4];
 138     uint8_t stencil_bits_array[4];
 139     uint8_t msaa_samples_array[1];
 140
 141     depth_bits_array[0] = 0;
 142     depth_bits_array[1] = 0;
 143     depth_bits_array[2] = depth_bits;
 144     depth_bits_array[3] = depth_bits;
 145
 146     /* Just like with the accumulation buffer, always provide some modes
 147      * with a stencil buffer.
 148      */
 149     stencil_bits_array[0] = 0;
 150     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 151     stencil_bits_array[2] = 0;
 152     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 153
 154     msaa_samples_array[0] = 0;
 155
 156     depth_buffer_factor = 4;
 157     back_buffer_factor = 2;
 158
 159     switch (pixel_bits) {
 160     case 8:
 161         fb_format = GL_RGB;
 162         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 163         break;
 164     case 16:
 165         fb_format = GL_RGB;
 166         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 167         break;
 168     case 24:
 169         fb_format = GL_BGR;
 170         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 171         break;
 172     case 32:
 173         fb_format = GL_BGRA;
 174         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 175         break;
 176     default:
 177         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 178                 pixel_bits);
 179         return NULL;
 180     }
 181
 182     configs = driCreateConfigs(fb_format, fb_type,
 183                                depth_bits_array, stencil_bits_array,
 184                                depth_buffer_factor, back_buffer_modes,
 185                                back_buffer_factor, msaa_samples_array, 1,
 186                                GL_TRUE);
 187     if (configs == NULL) {
 188         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 189                 __LINE__);
 190         return NULL;
 191     }
 192
 193     return configs;
 194 }
 195
 196 static const __DRIconfig **
 197 dri_init_screen(__DRIscreen * psp)
 198 {
 199     __DRIconfig **configs8, **configs16, **configs24, **configs32;
 200
 201     TRACE;
 202
 203     psp->extensions = dri_screen_extensions;
 204
 205     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 206     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 207     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 208     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 209
 210     configs16 = driConcatConfigs(configs8, configs16);
 211     configs24 = driConcatConfigs(configs16, configs24);
 212     configs32 = driConcatConfigs(configs24, configs32);
 213
 214     return (const __DRIconfig **)configs32;
 215 }
 216
 217 static void
 218 dri_destroy_screen(__DRIscreen * sPriv)
 219 {
 220     TRACE;
 221 }
 222
 223
 224 /**
 225  * Framebuffer and renderbuffer-related functions.
 226  */
 227
 228 static GLuint
 229 choose_pixel_format(const GLvisual *v)
 230 {
 231     int depth = v->rgbBits;
 232
 233     if (depth == 32
 234         && v->redMask   == 0xff0000
 235         && v->greenMask == 0x00ff00
 236         && v->blueMask  == 0x0000ff)
 237         return PF_A8R8G8B8;
 238     else if (depth == 24
 239              && v->redMask   == 0xff0000
 240              && v->greenMask == 0x00ff00
 241              && v->blueMask  == 0x0000ff)
 242         return PF_X8R8G8B8;
 243     else if (depth == 16
 244              && v->redMask   == 0xf800
 245              && v->greenMask == 0x07e0
 246              && v->blueMask  == 0x001f)
 247         return PF_R5G6B5;
 248     else if (depth == 8
 249              && v->redMask   == 0x07
 250              && v->greenMask == 0x38
 251              && v->blueMask  == 0xc0)
 252         return PF_R3G3B2;
 253
 254     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 255     return 0;
 256 }
 257
 258 static void
 259 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 260 {
 261     TRACE;
 262
 263     free(rb->Data);
 264     free(rb);
 265 }
 266
 267 /* see bytes_per_line in libGL */
 268 static INLINE int
 269 bytes_per_line(unsigned pitch_bits, unsigned mul)
 270 {
 271    unsigned mask = mul - 1;
 272
 273    return ((pitch_bits + mask) & ~mask) / 8;
 274 }
 275
 276 static GLboolean
 277 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 278                            GLenum internalFormat, GLuint width, GLuint height)
 279 {
 280     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 281
 282     TRACE;
 283
 284     rb->Data = NULL;
 285     rb->Width = width;
 286     rb->Height = height;
 287
 288     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 289
 290     return GL_TRUE;
 291 }
 292
 293 static GLboolean
 294 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 295                           GLenum internalFormat, GLuint width, GLuint height)
 296 {
 297     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 298
 299     TRACE;
 300
 301     free(rb->Data);
 302
 303     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 304
 305     rb->Data = malloc(height * xrb->pitch);
 306
 307     return GL_TRUE;
 308 }
 309
 310 static struct swrast_renderbuffer *
 311 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 312 {
 313     struct swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 314     GLuint pixel_format;
 315
 316     TRACE;
 317
 318     if (!xrb)
 319         return NULL;
 320
 321     _mesa_init_renderbuffer(&xrb->Base, 0);
 322
 323     pixel_format = choose_pixel_format(visual);
 324
 325     xrb->Base.Delete = swrast_delete_renderbuffer;
 326     if (front) {
 327         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 328         swrast_set_span_funcs_front(xrb, pixel_format);
 329     }
 330     else {
 331         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 332         swrast_set_span_funcs_back(xrb, pixel_format);
 333     }
 334
 335     switch (pixel_format) {
 336     case PF_A8R8G8B8:
 337         xrb->Base.Format = MESA_FORMAT_ARGB8888;
 338         xrb->Base.InternalFormat = GL_RGBA;
 339         xrb->Base._BaseFormat = GL_RGBA;
 340         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 341         xrb->bpp = 32;
 342         break;
 343     case PF_X8R8G8B8:
 344         xrb->Base.Format = MESA_FORMAT_ARGB8888; /* XXX */
 345         xrb->Base.InternalFormat = GL_RGB;
 346         xrb->Base._BaseFormat = GL_RGB;
 347         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 348         xrb->bpp = 32;
 349         break;
 350     case PF_R5G6B5:
 351         xrb->Base.Format = MESA_FORMAT_RGB565;
 352         xrb->Base.InternalFormat = GL_RGB;
 353         xrb->Base._BaseFormat = GL_RGB;
 354         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 355         xrb->bpp = 16;
 356         break;
 357     case PF_R3G3B2:
 358         xrb->Base.Format = MESA_FORMAT_RGB332;
 359         xrb->Base.InternalFormat = GL_RGB;
 360         xrb->Base._BaseFormat = GL_RGB;
 361         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 362         xrb->bpp = 8;
 363         break;
 364     default:
 365         return NULL;
 366     }
 367
 368     return xrb;
 369 }
 370
 371 static GLboolean
 372 dri_create_buffer(__DRIscreen * sPriv,
 373                   __DRIdrawable * dPriv,
 374                   const __GLcontextModes * visual, GLboolean isPixmap)
 375 {
 376     struct dri_drawable *drawable = NULL;
 377     GLframebuffer *fb;
 378     struct swrast_renderbuffer *frontrb, *backrb;
 379
 380     TRACE;
 381
 382     drawable = CALLOC_STRUCT(dri_drawable);
 383     if (drawable == NULL)
 384         goto drawable_fail;
 385
 386     dPriv->driverPrivate = drawable;
 387     drawable->dPriv = dPriv;
 388
 389     drawable->row = malloc(MAX_WIDTH * 4);
 390     if (drawable->row == NULL)
 391         goto drawable_fail;
 392
 393     fb = &drawable->Base;
 394
 395     /* basic framebuffer setup */
 396     _mesa_initialize_window_framebuffer(fb, visual);
 397
 398     /* add front renderbuffer */
 399     frontrb = swrast_new_renderbuffer(visual, GL_TRUE);
 400     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base);
 401
 402     /* add back renderbuffer */
 403     if (visual->doubleBufferMode) {
 404         backrb = swrast_new_renderbuffer(visual, GL_FALSE);
 405         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base);
 406     }
 407
 408     /* add software renderbuffers */
 409     _mesa_add_soft_renderbuffers(fb,
 410                                  GL_FALSE, /* color */
 411                                  visual->haveDepthBuffer,
 412                                  visual->haveStencilBuffer,
 413                                  visual->haveAccumBuffer,
 414                                  GL_FALSE, /* alpha */
 415                                  GL_FALSE /* aux bufs */);
 416
 417     return GL_TRUE;
 418
 419 drawable_fail:
 420
 421     if (drawable)
 422         free(drawable->row);
 423
 424     FREE(drawable);
 425
 426     return GL_FALSE;
 427 }
 428
 429 static void
 430 dri_destroy_buffer(__DRIdrawable * dPriv)
 431 {
 432     TRACE;
 433
 434     if (dPriv) {
 435         struct dri_drawable *drawable = dri_drawable(dPriv);
 436         GLframebuffer *fb;
 437
 438         free(drawable->row);
 439
 440         fb = &drawable->Base;
 441
 442         fb->DeletePending = GL_TRUE;
 443         _mesa_reference_framebuffer(&fb, NULL);
 444     }
 445 }
 446
 447 static void
 448 dri_swap_buffers(__DRIdrawable * dPriv)
 449 {
 450     __DRIscreen *sPriv = dPriv->driScreenPriv;
 451
 452     GET_CURRENT_CONTEXT(ctx);
 453
 454     struct dri_drawable *drawable = dri_drawable(dPriv);
 455     GLframebuffer *fb;
 456     struct swrast_renderbuffer *frontrb, *backrb;
 457
 458     TRACE;
 459
 460     fb = &drawable->Base;
 461
 462     frontrb =
 463         swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 464     backrb =
 465         swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 466
 467     /* check for signle-buffered */
 468     if (backrb == NULL)
 469         return;
 470
 471     /* check if swapping currently bound buffer */
 472     if (ctx && ctx->DrawBuffer == fb) {
 473         /* flush pending rendering */
 474         _mesa_notifySwapBuffers(ctx);
 475     }
 476
 477     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 478                                    0, 0,
 479                                    frontrb->Base.Width,
 480                                    frontrb->Base.Height,
 481                                    backrb->Base.Data,
 482                                    dPriv->loaderPrivate);
 483 }
 484
 485
 486 /**
 487  * General device driver functions.
 488  */
 489
 490 static void
 491 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 492 {
 493     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 494     __DRIscreen *sPriv = dPriv->driScreenPriv;
 495     int x, y;
 496
 497     sPriv->swrast_loader->getDrawableInfo(dPriv,
 498                                           &x, &y, w, h,
 499                                           dPriv->loaderPrivate);
 500 }
 501
 502 static void
 503 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *fb )
 504 {
 505     GLsizei width, height;
 506
 507     get_window_size(fb, &width, &height);
 508     if (fb->Width != width || fb->Height != height) {
 509         _mesa_resize_framebuffer(ctx, fb, width, height);
 510     }
 511 }
 512
 513 static const GLubyte *
 514 get_string(GLcontext *ctx, GLenum pname)
 515 {
 516     (void) ctx;
 517     switch (pname) {
 518         case GL_VENDOR:
 519             return (const GLubyte *) "Mesa Project";
 520         case GL_RENDERER:
 521             return (const GLubyte *) "Software Rasterizer";
 522         default:
 523             return NULL;
 524     }
 525 }
 526
 527 static void
 528 update_state( GLcontext *ctx, GLuint new_state )
 529 {
 530     /* not much to do here - pass it on */
 531     _swrast_InvalidateState( ctx, new_state );
 532     _swsetup_InvalidateState( ctx, new_state );
 533     _vbo_InvalidateState( ctx, new_state );
 534     _tnl_InvalidateState( ctx, new_state );
 535 }
 536
 537 static void
 538 viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 539 {
 540     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 541     GLframebuffer *read = ctx->WinSysReadBuffer;
 542
 543     swrast_check_and_update_window_size(ctx, draw);
 544     swrast_check_and_update_window_size(ctx, read);
 545 }
 546
 547 static gl_format swrastChooseTextureFormat(GLcontext * ctx,
 548                                            GLint internalFormat,
 549                                            GLenum format,
 550                                            GLenum type)
 551 {
 552     if (internalFormat == GL_RGB)
 553         return MESA_FORMAT_XRGB8888;
 554     return _mesa_choose_tex_format(ctx, internalFormat, format, type);
 555 }
 556
 557 static void
 558 swrast_init_driver_functions(struct dd_function_table *driver)
 559 {
 560     driver->GetString = get_string;
 561     driver->UpdateState = update_state;
 562     driver->GetBufferSize = NULL;
 563     driver->Viewport = viewport;
 564     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 565 }
 566
 567
 568 /**
 569  * Context-related functions.
 570  */
 571
 572 static GLboolean
 573 dri_create_context(gl_api api,
 574                    const __GLcontextModes * visual,
 575                    __DRIcontext * cPriv, void *sharedContextPrivate)
 576 {
 577     struct dri_context *ctx = NULL;
 578     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 579     GLcontext *mesaCtx = NULL;
 580     GLcontext *sharedCtx = NULL;
 581     struct dd_function_table functions;
 582
 583     TRACE;
 584
 585     ctx = CALLOC_STRUCT(dri_context);
 586     if (ctx == NULL)
 587         goto context_fail;
 588
 589     cPriv->driverPrivate = ctx;
 590     ctx->cPriv = cPriv;
 591
 592     /* build table of device driver functions */
 593     _mesa_init_driver_functions(&functions);
 594     swrast_init_driver_functions(&functions);
 595
 596     if (share) {
 597         sharedCtx = &share->Base;
 598     }
 599
 600     mesaCtx = &ctx->Base;
 601
 602     /* basic context setup */
 603     if (!_mesa_initialize_context(mesaCtx, visual, sharedCtx, &functions, (void *) cPriv)) {
 604         goto context_fail;
 605     }
 606
 607     /* do bounds checking to prevent segfaults and server crashes! */
 608     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 609
 610     /* create module contexts */
 611     _swrast_CreateContext( mesaCtx );
 612     _vbo_CreateContext( mesaCtx );
 613     _tnl_CreateContext( mesaCtx );
 614     _swsetup_CreateContext( mesaCtx );
 615     _swsetup_Wakeup( mesaCtx );
 616
 617     /* use default TCL pipeline */
 618     {
 619        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 620        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 621     }
 622
 623     _mesa_enable_sw_extensions(mesaCtx);
 624     _mesa_enable_1_3_extensions(mesaCtx);
 625     _mesa_enable_1_4_extensions(mesaCtx);
 626     _mesa_enable_1_5_extensions(mesaCtx);
 627     _mesa_enable_2_0_extensions(mesaCtx);
 628     _mesa_enable_2_1_extensions(mesaCtx);
 629
 630     _mesa_meta_init(mesaCtx);
 631
 632     driInitExtensions( mesaCtx, NULL, GL_FALSE );
 633
 634     return GL_TRUE;
 635
 636 context_fail:
 637
 638     FREE(ctx);
 639
 640     return GL_FALSE;
 641 }
 642
 643 static void
 644 dri_destroy_context(__DRIcontext * cPriv)
 645 {
 646     TRACE;
 647
 648     if (cPriv) {
 649         struct dri_context *ctx = dri_context(cPriv);
 650         GLcontext *mesaCtx;
 651
 652         mesaCtx = &ctx->Base;
 653
 654         _mesa_meta_free(mesaCtx);
 655         _swsetup_DestroyContext( mesaCtx );
 656         _swrast_DestroyContext( mesaCtx );
 657         _tnl_DestroyContext( mesaCtx );
 658         _vbo_DestroyContext( mesaCtx );
 659         _mesa_destroy_context( mesaCtx );
 660     }
 661 }
 662
 663 static GLboolean
 664 dri_make_current(__DRIcontext * cPriv,
 665                  __DRIdrawable * driDrawPriv,
 666                  __DRIdrawable * driReadPriv)
 667 {
 668     GLcontext *mesaCtx;
 669     GLframebuffer *mesaDraw;
 670     GLframebuffer *mesaRead;
 671     TRACE;
 672
 673     if (cPriv) {
 674         struct dri_context *ctx = dri_context(cPriv);
 675         struct dri_drawable *draw;
 676         struct dri_drawable *read;
 677
 678         if (!driDrawPriv || !driReadPriv)
 679             return GL_FALSE;
 680
 681         draw = dri_drawable(driDrawPriv);
 682         read = dri_drawable(driReadPriv);
 683         mesaCtx = &ctx->Base;
 684         mesaDraw = &draw->Base;
 685         mesaRead = &read->Base;
 686
 687         /* check for same context and buffer */
 688         if (mesaCtx == _mesa_get_current_context()
 689             && mesaCtx->DrawBuffer == mesaDraw
 690             && mesaCtx->ReadBuffer == mesaRead) {
 691             return GL_TRUE;
 692         }
 693
 694         _glapi_check_multithread();
 695
 696         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 697         if (mesaRead != mesaDraw)
 698             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 699
 700         _mesa_make_current( mesaCtx,
 701                             mesaDraw,
 702                             mesaRead );
 703     }
 704     else {
 705         /* unbind */
 706         _mesa_make_current( NULL, NULL, NULL );
 707     }
 708
 709     return GL_TRUE;
 710 }
 711
 712 static GLboolean
 713 dri_unbind_context(__DRIcontext * cPriv)
 714 {
 715     TRACE;
 716     (void) cPriv;
 717     return GL_TRUE;
 718 }
 719
 720
 721 const struct __DriverAPIRec driDriverAPI = {
 722     .InitScreen = dri_init_screen,
 723     .DestroyScreen = dri_destroy_screen,
 724     .CreateContext = dri_create_context,
 725     .DestroyContext = dri_destroy_context,
 726     .CreateBuffer = dri_create_buffer,
 727     .DestroyBuffer = dri_destroy_buffer,
 728     .SwapBuffers = dri_swap_buffers,
 729     .MakeCurrent = dri_make_current,
 730     .UnbindContext = dri_unbind_context,
 731 };
 732
 733 /* This is the table of extensions that the loader will dlsym() for. */
 734 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 735     &driCoreExtension.base,
 736     &driSWRastExtension.base,
 737     NULL
 738 };