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

   1 /*
   2  * Copyright (C) 2008 George Sapountzis <gsap7@yahoo.gr>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included
  12  * in all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  15  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  18  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  19  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  20  */
  21
  22 /*
  23  * DRI software rasterizer
  24  *
  25  * This is the mesa swrast module packaged into a DRI driver structure.
  26  *
  27  * The front-buffer is allocated by the loader. The loader provides read/write
  28  * callbacks for access to the front-buffer. The driver uses a scratch row for
  29  * front-buffer rendering to avoid repeated calls to the loader.
  30  *
  31  * The back-buffer is allocated by the driver and is private.
  32  */
  33
  34 #include "main/context.h"
  35 #include "main/extensions.h"
  36 #include "main/framebuffer.h"
  37 #include "main/imports.h"
  38 #include "main/renderbuffer.h"
  39 #include "swrast/swrast.h"
  40 #include "swrast_setup/swrast_setup.h"
  41 #include "tnl/tnl.h"
  42 #include "tnl/t_context.h"
  43 #include "tnl/t_pipeline.h"
  44 #include "vbo/vbo.h"
  45 #include "drivers/common/driverfuncs.h"
  46 #include "utils.h"
  47
  48 #include "swrast_priv.h"
  49
  50
  51 #define need_GL_VERSION_1_3
  52 #define need_GL_VERSION_1_4
  53 #define need_GL_VERSION_1_5
  54 #define need_GL_VERSION_2_0
  55 #define need_GL_VERSION_2_1
  56
  57 /* sw extensions for imaging */
  58 #define need_GL_EXT_blend_color
  59 #define need_GL_EXT_blend_minmax
  60 #define need_GL_EXT_convolution
  61 #define need_GL_EXT_histogram
  62 #define need_GL_SGI_color_table
  63
  64 /* sw extensions not associated with some GL version */
  65 #define need_GL_ARB_shader_objects
  66 #define need_GL_ARB_vertex_program
  67 #define need_GL_APPLE_vertex_array_object
  68 #define need_GL_ATI_fragment_shader
  69 #define need_GL_ATI_separate_stencil
  70 #define need_GL_EXT_depth_bounds_test
  71 #define need_GL_EXT_framebuffer_object
  72 #define need_GL_EXT_framebuffer_blit
  73 #define need_GL_EXT_gpu_program_parameters
  74 #define need_GL_EXT_paletted_texture
  75 #define need_GL_EXT_stencil_two_side
  76 #define need_GL_MESA_resize_buffers
  77 #define need_GL_NV_vertex_program
  78 #define need_GL_NV_fragment_program
  79
  80 #include "extension_helper.h"
  81
  82 const struct dri_extension card_extensions[] =
  83 {
  84     { "GL_VERSION_1_3",                 GL_VERSION_1_3_functions },
  85     { "GL_VERSION_1_4",                 GL_VERSION_1_4_functions },
  86     { "GL_VERSION_1_5",                 GL_VERSION_1_5_functions },
  87     { "GL_VERSION_2_0",                 GL_VERSION_2_0_functions },
  88     { "GL_VERSION_2_1",                 GL_VERSION_2_1_functions },
  89
  90     { "GL_EXT_blend_color",             GL_EXT_blend_color_functions },
  91     { "GL_EXT_blend_minmax",            GL_EXT_blend_minmax_functions },
  92     { "GL_EXT_convolution",             GL_EXT_convolution_functions },
  93     { "GL_EXT_histogram",               GL_EXT_histogram_functions },
  94     { "GL_SGI_color_table",             GL_SGI_color_table_functions },
  95
  96     { "GL_ARB_shader_objects",          GL_ARB_shader_objects_functions },
  97     { "GL_ARB_vertex_program",          GL_ARB_vertex_program_functions },
  98     { "GL_APPLE_vertex_array_object",   GL_APPLE_vertex_array_object_functions },
  99     { "GL_ATI_fragment_shader",         GL_ATI_fragment_shader_functions },
 100     { "GL_ATI_separate_stencil",        GL_ATI_separate_stencil_functions },
 101     { "GL_EXT_depth_bounds_test",       GL_EXT_depth_bounds_test_functions },
 102     { "GL_EXT_framebuffer_object",      GL_EXT_framebuffer_object_functions },
 103     { "GL_EXT_framebuffer_blit",        GL_EXT_framebuffer_blit_functions },
 104     { "GL_EXT_gpu_program_parameters",  GL_EXT_gpu_program_parameters_functions },
 105     { "GL_EXT_paletted_texture",        GL_EXT_paletted_texture_functions },
 106     { "GL_EXT_stencil_two_side",        GL_EXT_stencil_two_side_functions },
 107     { "GL_MESA_resize_buffers",         GL_MESA_resize_buffers_functions },
 108     { "GL_NV_vertex_program",           GL_NV_vertex_program_functions },
 109     { "GL_NV_fragment_program",         GL_NV_fragment_program_functions },
 110     { NULL,                             NULL }
 111 };
 112
 113
 114 /**
 115  * Screen and config-related functions
 116  */
 117
 118 static void
 119 setupLoaderExtensions(__DRIscreen *psp,
 120                       const __DRIextension **extensions)
 121 {
 122     int i;
 123
 124     for (i = 0; extensions[i]; i++) {
 125         if (strcmp(extensions[i]->name, __DRI_SWRAST_LOADER) == 0)
 126             psp->swrast_loader = (__DRIswrastLoaderExtension *) extensions[i];
 127     }
 128 }
 129
 130 static const __DRIconfig **
 131 swrastFillInModes(__DRIscreen *psp,
 132                   unsigned pixel_bits, unsigned depth_bits,
 133                   unsigned stencil_bits, GLboolean have_back_buffer)
 134 {
 135     __DRIconfig **configs;
 136     unsigned depth_buffer_factor;
 137     unsigned back_buffer_factor;
 138     GLenum fb_format;
 139     GLenum fb_type;
 140
 141     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 142      * support pageflipping at all.
 143      */
 144     static const GLenum back_buffer_modes[] = {
 145         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 146     };
 147
 148     uint8_t depth_bits_array[4];
 149     uint8_t stencil_bits_array[4];
 150
 151     depth_bits_array[0] = 0;
 152     depth_bits_array[1] = 0;
 153     depth_bits_array[2] = depth_bits;
 154     depth_bits_array[3] = depth_bits;
 155
 156     /* Just like with the accumulation buffer, always provide some modes
 157      * with a stencil buffer.
 158      */
 159     stencil_bits_array[0] = 0;
 160     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 161     stencil_bits_array[2] = 0;
 162     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 163
 164     depth_buffer_factor = 4;
 165     back_buffer_factor = 2;
 166
 167     if (pixel_bits == 8) {
 168         fb_format = GL_RGB;
 169         fb_type = GL_UNSIGNED_BYTE_2_3_3_REV;
 170     }
 171     else if (pixel_bits == 16) {
 172         fb_format = GL_RGB;
 173         fb_type = GL_UNSIGNED_SHORT_5_6_5;
 174     }
 175     else {
 176         fb_format = GL_BGRA;
 177         fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
 178     }
 179
 180     configs = driCreateConfigs(fb_format, fb_type,
 181                                depth_bits_array, stencil_bits_array,
 182                                depth_buffer_factor, back_buffer_modes,
 183                                back_buffer_factor);
 184     if (configs == NULL) {
 185         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 186                 __LINE__);
 187         return NULL;
 188     }
 189
 190     return (const __DRIconfig **)configs;
 191 }
 192
 193 static __DRIscreen *
 194 driCreateNewScreen(int scrn, const __DRIextension **extensions,
 195                    const __DRIconfig ***driver_configs, void *data)
 196 {
 197     static const __DRIextension *emptyExtensionList[] = { NULL };
 198     __DRIscreen *psp;
 199     const __DRIconfig **configs8, **configs16, **configs32;
 200
 201     (void) data;
 202
 203     TRACE;
 204
 205     psp = _mesa_calloc(sizeof(*psp));
 206     if (!psp)
 207         return NULL;
 208
 209     setupLoaderExtensions(psp, extensions);
 210
 211     psp->num = scrn;
 212     psp->extensions = emptyExtensionList;
 213
 214     configs8  = swrastFillInModes(psp,  8,  8, 0, 1);
 215     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 216     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 217
 218     configs16 = driConcatConfigs(configs8, configs16);
 219
 220     *driver_configs = driConcatConfigs(configs16, configs32);
 221
 222     driInitExtensions( NULL, card_extensions, GL_FALSE );
 223
 224     return psp;
 225 }
 226
 227 static void driDestroyScreen(__DRIscreen *psp)
 228 {
 229     TRACE;
 230
 231     if (psp) {
 232         _mesa_free(psp);
 233     }
 234 }
 235
 236 static const __DRIextension **driGetExtensions(__DRIscreen *psp)
 237 {
 238     TRACE;
 239
 240     return psp->extensions;
 241 }
 242
 243
 244 /**
 245  * Framebuffer and renderbuffer-related functions.
 246  */
 247
 248 static GLuint
 249 choose_pixel_format(const GLvisual *v)
 250 {
 251     if (v->rgbMode) {
 252         int bpp = v->rgbBits;
 253
 254         if (bpp == 32
 255             && v->redMask   == 0xff0000
 256             && v->greenMask == 0x00ff00
 257             && v->blueMask  == 0x0000ff)
 258             return PF_A8R8G8B8;
 259         else if (bpp == 16
 260             && v->redMask   == 0xf800
 261             && v->greenMask == 0x07e0
 262             && v->blueMask  == 0x001f)
 263             return PF_R5G6B5;
 264         else if (bpp == 8
 265             && v->redMask   == 0x07
 266             && v->greenMask == 0x38
 267             && v->blueMask  == 0xc0)
 268             return PF_R3G3B2;
 269     }
 270     else {
 271         if (v->indexBits == 8)
 272             return PF_CI8;
 273     }
 274
 275     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 276     return 0;
 277 }
 278
 279 static void
 280 swrast_delete_renderbuffer(struct gl_renderbuffer *rb)
 281 {
 282     TRACE;
 283
 284     _mesa_free(rb->Data);
 285     _mesa_free(rb);
 286 }
 287
 288 static GLboolean
 289 swrast_alloc_front_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 290                            GLenum internalFormat, GLuint width, GLuint height)
 291 {
 292     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 293     int bpp;
 294     unsigned mask = PITCH_ALIGN_BITS - 1;
 295
 296     TRACE;
 297
 298     rb->Data = NULL;
 299     rb->Width = width;
 300     rb->Height = height;
 301
 302     switch (internalFormat) {
 303     case GL_RGB:
 304         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits;
 305         break;
 306     case GL_RGBA:
 307         bpp = rb->RedBits + rb->GreenBits + rb->BlueBits + rb->AlphaBits;
 308         break;
 309     case GL_COLOR_INDEX8_EXT:
 310         bpp = rb->IndexBits;
 311         break;
 312     default:
 313         _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 314         return GL_FALSE;
 315     }
 316
 317     /* always pad to PITCH_ALIGN_BITS */
 318     xrb->pitch = ((width * bpp + mask) & ~mask) / 8;
 319
 320     return GL_TRUE;
 321 }
 322
 323 static GLboolean
 324 swrast_alloc_back_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
 325                           GLenum internalFormat, GLuint width, GLuint height)
 326 {
 327     struct swrast_renderbuffer *xrb = swrast_renderbuffer(rb);
 328
 329     TRACE;
 330
 331     _mesa_free(rb->Data);
 332
 333     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 334
 335     rb->Data = _mesa_malloc(height * xrb->pitch);
 336
 337     return GL_TRUE;
 338 }
 339
 340 static struct swrast_renderbuffer *
 341 swrast_new_renderbuffer(const GLvisual *visual, GLboolean front)
 342 {
 343     struct swrast_renderbuffer *xrb = _mesa_calloc(sizeof *xrb);
 344     GLuint pixel_format;
 345
 346     TRACE;
 347
 348     if (!xrb)
 349         return NULL;
 350
 351     _mesa_init_renderbuffer(&xrb->Base, 0);
 352
 353     pixel_format = choose_pixel_format(visual);
 354
 355     xrb->Base.Delete = swrast_delete_renderbuffer;
 356     if (front) {
 357         xrb->Base.AllocStorage = swrast_alloc_front_storage;
 358         swrast_set_span_funcs_front(xrb, pixel_format);
 359     }
 360     else {
 361         xrb->Base.AllocStorage = swrast_alloc_back_storage;
 362         swrast_set_span_funcs_back(xrb, pixel_format);
 363     }
 364
 365     switch (pixel_format) {
 366     case PF_A8R8G8B8:
 367         xrb->Base.InternalFormat = GL_RGBA;
 368         xrb->Base._BaseFormat = GL_RGBA;
 369         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 370         xrb->Base.RedBits   = 8 * sizeof(GLubyte);
 371         xrb->Base.GreenBits = 8 * sizeof(GLubyte);
 372         xrb->Base.BlueBits  = 8 * sizeof(GLubyte);
 373         xrb->Base.AlphaBits = 8 * sizeof(GLubyte);
 374         break;
 375     case PF_R5G6B5:
 376         xrb->Base.InternalFormat = GL_RGB;
 377         xrb->Base._BaseFormat = GL_RGB;
 378         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 379         xrb->Base.RedBits   = 5 * sizeof(GLubyte);
 380         xrb->Base.GreenBits = 6 * sizeof(GLubyte);
 381         xrb->Base.BlueBits  = 5 * sizeof(GLubyte);
 382         xrb->Base.AlphaBits = 0;
 383         break;
 384     case PF_R3G3B2:
 385         xrb->Base.InternalFormat = GL_RGB;
 386         xrb->Base._BaseFormat = GL_RGB;
 387         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 388         xrb->Base.RedBits   = 3 * sizeof(GLubyte);
 389         xrb->Base.GreenBits = 3 * sizeof(GLubyte);
 390         xrb->Base.BlueBits  = 2 * sizeof(GLubyte);
 391         xrb->Base.AlphaBits = 0;
 392         break;
 393     case PF_CI8:
 394         xrb->Base.InternalFormat = GL_COLOR_INDEX8_EXT;
 395         xrb->Base._BaseFormat = GL_COLOR_INDEX;
 396         xrb->Base.DataType = GL_UNSIGNED_BYTE;
 397         xrb->Base.IndexBits = 8 * sizeof(GLubyte);
 398         break;
 399     default:
 400         return NULL;
 401     }
 402
 403     return xrb;
 404 }
 405
 406 static __DRIdrawable *
 407 driCreateNewDrawable(__DRIscreen *screen,
 408                      const __DRIconfig *config, void *data)
 409 {
 410     __DRIdrawable *buf;
 411     struct swrast_renderbuffer *frontrb, *backrb;
 412
 413     TRACE;
 414
 415     buf = _mesa_calloc(sizeof *buf);
 416     if (!buf)
 417         return NULL;
 418
 419     buf->loaderPrivate = data;
 420
 421     buf->driScreenPriv = screen;
 422
 423     buf->row = _mesa_malloc(MAX_WIDTH * 4);
 424
 425     /* basic framebuffer setup */
 426     _mesa_initialize_framebuffer(&buf->Base, &config->modes);
 427
 428     /* add front renderbuffer */
 429     frontrb = swrast_new_renderbuffer(&config->modes, GL_TRUE);
 430     _mesa_add_renderbuffer(&buf->Base, BUFFER_FRONT_LEFT, &frontrb->Base);
 431
 432     /* add back renderbuffer */
 433     if (config->modes.doubleBufferMode) {
 434         backrb = swrast_new_renderbuffer(&config->modes, GL_FALSE);
 435         _mesa_add_renderbuffer(&buf->Base, BUFFER_BACK_LEFT, &backrb->Base);
 436     }
 437
 438     /* add software renderbuffers */
 439     _mesa_add_soft_renderbuffers(&buf->Base,
 440                                  GL_FALSE, /* color */
 441                                  config->modes.haveDepthBuffer,
 442                                  config->modes.haveStencilBuffer,
 443                                  config->modes.haveAccumBuffer,
 444                                  GL_FALSE, /* alpha */
 445                                  GL_FALSE /* aux bufs */);
 446
 447     return buf;
 448 }
 449
 450 static void
 451 driDestroyDrawable(__DRIdrawable *buf)
 452 {
 453     TRACE;
 454
 455     if (buf) {
 456         struct gl_framebuffer *fb = &buf->Base;
 457
 458         _mesa_free(buf->row);
 459
 460         fb->DeletePending = GL_TRUE;
 461         _mesa_unreference_framebuffer(&fb);
 462     }
 463 }
 464
 465 static void driSwapBuffers(__DRIdrawable *buf)
 466 {
 467     GET_CURRENT_CONTEXT(ctx);
 468
 469     struct swrast_renderbuffer *frontrb =
 470         swrast_renderbuffer(buf->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 471     struct swrast_renderbuffer *backrb =
 472         swrast_renderbuffer(buf->Base.Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 473
 474     __DRIscreen *screen = buf->driScreenPriv;
 475
 476     TRACE;
 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 == &(buf->Base)) {
 484         /* flush pending rendering */
 485         _mesa_notifySwapBuffers(ctx);
 486     }
 487
 488     screen->swrast_loader->putImage(buf, __DRI_SWRAST_IMAGE_OP_SWAP,
 489                                     0, 0,
 490                                     frontrb->Base.Width,
 491                                     frontrb->Base.Height,
 492                                     backrb->Base.Data,
 493                                     buf->loaderPrivate);
 494 }
 495
 496
 497 /**
 498  * General device driver functions.
 499  */
 500
 501 static void
 502 get_window_size( GLframebuffer *fb, GLsizei *w, GLsizei *h )
 503 {
 504     __DRIdrawable *buf = swrast_drawable(fb);
 505     __DRIscreen *screen = buf->driScreenPriv;
 506     int x, y;
 507
 508     screen->swrast_loader->getDrawableInfo(buf,
 509                                            &x, &y, w, h,
 510                                            buf->loaderPrivate);
 511 }
 512
 513 static void
 514 swrast_check_and_update_window_size( GLcontext *ctx, GLframebuffer *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(GLcontext *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( GLcontext *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(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
 550 {
 551     GLframebuffer *draw = ctx->WinSysDrawBuffer;
 552     GLframebuffer *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 void
 559 swrast_init_driver_functions(struct dd_function_table *driver)
 560 {
 561     driver->GetString = get_string;
 562     driver->UpdateState = update_state;
 563     driver->GetBufferSize = NULL;
 564     driver->Viewport = viewport;
 565 }
 566
 567
 568 /**
 569  * Context-related functions.
 570  */
 571
 572 static __DRIcontext *
 573 driCreateNewContext(__DRIscreen *screen, const __DRIconfig *config,
 574                     __DRIcontext *shared, void *data)
 575 {
 576     __DRIcontext *ctx;
 577     GLcontext *mesaCtx;
 578     struct dd_function_table functions;
 579
 580     TRACE;
 581
 582     ctx = _mesa_calloc(sizeof *ctx);
 583     if (!ctx)
 584         return NULL;
 585
 586     ctx->loaderPrivate = data;
 587
 588     ctx->driScreenPriv = screen;
 589
 590     /* build table of device driver functions */
 591     _mesa_init_driver_functions(&functions);
 592     swrast_init_driver_functions(&functions);
 593
 594     if (!_mesa_initialize_context(&ctx->Base, &config->modes,
 595                                   shared ? &shared->Base : NULL,
 596                                   &functions, (void *) ctx)) {
 597       _mesa_free(ctx);
 598       return NULL;
 599     }
 600
 601     mesaCtx = &ctx->Base;
 602
 603     /* do bounds checking to prevent segfaults and server crashes! */
 604     mesaCtx->Const.CheckArrayBounds = GL_TRUE;
 605
 606     /* create module contexts */
 607     _swrast_CreateContext( mesaCtx );
 608     _vbo_CreateContext( mesaCtx );
 609     _tnl_CreateContext( mesaCtx );
 610     _swsetup_CreateContext( mesaCtx );
 611     _swsetup_Wakeup( mesaCtx );
 612
 613     /* use default TCL pipeline */
 614     {
 615        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 616        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 617     }
 618
 619     _mesa_enable_sw_extensions(mesaCtx);
 620     _mesa_enable_1_3_extensions(mesaCtx);
 621     _mesa_enable_1_4_extensions(mesaCtx);
 622     _mesa_enable_1_5_extensions(mesaCtx);
 623     _mesa_enable_2_0_extensions(mesaCtx);
 624     _mesa_enable_2_1_extensions(mesaCtx);
 625
 626     return ctx;
 627 }
 628
 629 static void
 630 driDestroyContext(__DRIcontext *ctx)
 631 {
 632     GLcontext *mesaCtx;
 633     TRACE;
 634
 635     if (ctx) {
 636         mesaCtx = &ctx->Base;
 637         _swsetup_DestroyContext( mesaCtx );
 638         _swrast_DestroyContext( mesaCtx );
 639         _tnl_DestroyContext( mesaCtx );
 640         _vbo_DestroyContext( mesaCtx );
 641         _mesa_destroy_context( mesaCtx );
 642     }
 643 }
 644
 645 static int
 646 driCopyContext(__DRIcontext *dst, __DRIcontext *src, unsigned long mask)
 647 {
 648     TRACE;
 649
 650     _mesa_copy_context(&src->Base, &dst->Base, mask);
 651     return GL_TRUE;
 652 }
 653
 654 static int driBindContext(__DRIcontext *ctx,
 655                           __DRIdrawable *draw,
 656                           __DRIdrawable *read)
 657 {
 658     GLcontext *mesaCtx;
 659     GLframebuffer *mesaDraw;
 660     GLframebuffer *mesaRead;
 661     TRACE;
 662
 663     if (ctx) {
 664         if (!draw || !read)
 665             return GL_FALSE;
 666
 667         mesaCtx = &ctx->Base;
 668         mesaDraw = &draw->Base;
 669         mesaRead = &read->Base;
 670
 671         /* check for same context and buffer */
 672         if (mesaCtx == _mesa_get_current_context()
 673             && mesaCtx->DrawBuffer == mesaDraw
 674             && mesaCtx->ReadBuffer == mesaRead) {
 675             return GL_TRUE;
 676         }
 677
 678         _glapi_check_multithread();
 679
 680         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 681         if (read != draw)
 682             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 683
 684         _mesa_make_current( mesaCtx,
 685                             mesaDraw,
 686                             mesaRead );
 687     }
 688     else {
 689         /* unbind */
 690         _mesa_make_current( NULL, NULL, NULL );
 691     }
 692
 693     return GL_TRUE;
 694 }
 695
 696 static int driUnbindContext(__DRIcontext *ctx)
 697 {
 698     TRACE;
 699     (void) ctx;
 700     return GL_TRUE;
 701 }
 702
 703
 704 static const __DRIcoreExtension driCoreExtension = {
 705     { __DRI_CORE, __DRI_CORE_VERSION },
 706     NULL, /* driCreateNewScreen */
 707     driDestroyScreen,
 708     driGetExtensions,
 709     driGetConfigAttrib,
 710     driIndexConfigAttrib,
 711     NULL, /* driCreateNewDrawable */
 712     driDestroyDrawable,
 713     driSwapBuffers,
 714     driCreateNewContext,
 715     driCopyContext,
 716     driDestroyContext,
 717     driBindContext,
 718     driUnbindContext
 719 };
 720
 721 static const __DRIswrastExtension driSWRastExtension = {
 722     { __DRI_SWRAST, __DRI_SWRAST_VERSION },
 723     driCreateNewScreen,
 724     driCreateNewDrawable
 725 };
 726
 727 /* This is the table of extensions that the loader will dlsym() for. */
 728 PUBLIC const __DRIextension *__driDriverExtensions[] = {
 729     &driCoreExtension.base,
 730     &driSWRastExtension.base,
 731     NULL
 732 };