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  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 /*
  24  * DRI software rasterizer
  25  *
  26  * This is the mesa swrast module packaged into a DRI driver structure.
  27  *
  28  * The front-buffer is allocated by the loader. The loader provides read/write
  29  * callbacks for access to the front-buffer. The driver uses a scratch row for
  30  * front-buffer rendering to avoid repeated calls to the loader.
  31  *
  32  * The back-buffer is allocated by the driver and is private.
  33  */
  34
  35 #include "main/api_exec.h"
  36 #include "main/context.h"
  37 #include "main/extensions.h"
  38 #include "main/formats.h"
  39 #include "main/framebuffer.h"
  40 #include "main/imports.h"
  41 #include "main/renderbuffer.h"
  42 #include "main/version.h"
  43 #include "main/vtxfmt.h"
  44 #include "swrast/swrast.h"
  45 #include "swrast/s_renderbuffer.h"
  46 #include "swrast_setup/swrast_setup.h"
  47 #include "tnl/tnl.h"
  48 #include "tnl/t_context.h"
  49 #include "tnl/t_pipeline.h"
  50 #include "vbo/vbo.h"
  51 #include "drivers/common/driverfuncs.h"
  52 #include "drivers/common/meta.h"
  53 #include "utils.h"
  54
  55 #include "main/teximage.h"
  56 #include "main/texformat.h"
  57 #include "main/texstate.h"
  58
  59 #include "swrast_priv.h"
  60 #include "swrast/s_context.h"
  61
  62 const __DRIextension **__driDriverGetExtensions_swrast(void);
  63
  64 const char const *swrast_vendor_string = "Mesa Project";
  65 const char const *swrast_renderer_string = "Software Rasterizer";
  66
  67 /**
  68  * Screen and config-related functions
  69  */
  70
  71 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  72                                 GLint texture_format, __DRIdrawable *dPriv)
  73 {
  74     struct dri_context *dri_ctx;
  75     int x, y, w, h;
  76     __DRIscreen *sPriv = dPriv->driScreenPriv;
  77     struct gl_texture_object *texObj;
  78     struct gl_texture_image *texImage;
  79     struct swrast_texture_image *swImage;
  80     uint32_t internalFormat;
  81     mesa_format texFormat;
  82
  83     dri_ctx = pDRICtx->driverPrivate;
  84
  85     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  86
  87     texObj = _mesa_get_current_tex_object(&dri_ctx->Base, target);
  88     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  89     swImage = swrast_texture_image(texImage);
  90
  91     _mesa_lock_texture(&dri_ctx->Base, texObj);
  92
  93     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
  94
  95     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
  96         texFormat = MESA_FORMAT_B8G8R8X8_UNORM;
  97     else
  98         texFormat = MESA_FORMAT_B8G8R8A8_UNORM;
  99
 100     _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
 101                                w, h, 1, 0, internalFormat, texFormat);
 102
 103     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
 104                                    dPriv->loaderPrivate);
 105
 106     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 107 }
 108
 109 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 110                                __DRIdrawable *dPriv)
 111 {
 112     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 113 }
 114
 115 static const __DRItexBufferExtension swrastTexBufferExtension = {
 116    .base = { __DRI_TEX_BUFFER, 3 },
 117
 118    .setTexBuffer        = swrastSetTexBuffer,
 119    .setTexBuffer2       = swrastSetTexBuffer2,
 120    .releaseTexBuffer    = NULL,
 121 };
 122
 123
 124 static int
 125 swrast_query_renderer_integer(__DRIscreen *psp, int param,
 126                                unsigned int *value)
 127 {
 128    switch (param) {
 129    case __DRI2_RENDERER_VENDOR_ID:
 130    case __DRI2_RENDERER_DEVICE_ID:
 131       /* Return 0xffffffff for both vendor and device id */
 132       value[0] = 0xffffffff;
 133       return 0;
 134    case __DRI2_RENDERER_ACCELERATED:
 135       value[0] = 0;
 136       return 0;
 137    case __DRI2_RENDERER_VIDEO_MEMORY: {
 138       /* XXX: Do we want to return the full amount of system memory ? */
 139       const long system_memory_pages = sysconf(_SC_PHYS_PAGES);
 140       const long system_page_size = sysconf(_SC_PAGE_SIZE);
 141
 142       if (system_memory_pages <= 0 || system_page_size <= 0)
 143          return -1;
 144
 145       const uint64_t system_memory_bytes = (uint64_t) system_memory_pages
 146          * (uint64_t) system_page_size;
 147
 148       const unsigned system_memory_megabytes =
 149          (unsigned) (system_memory_bytes / (1024 * 1024));
 150
 151       value[0] = system_memory_megabytes;
 152       return 0;
 153    }
 154    case __DRI2_RENDERER_UNIFIED_MEMORY_ARCHITECTURE:
 155       /**
 156        * XXX: Perhaps we should return 1 ?
 157        * See issue #7 from the spec, currently UNRESOLVED.
 158        */
 159       value[0] = 0;
 160       return 0;
 161    default:
 162       return driQueryRendererIntegerCommon(psp, param, value);
 163    }
 164 }
 165
 166 static int
 167 swrast_query_renderer_string(__DRIscreen *psp, int param, const char **value)
 168 {
 169    switch (param) {
 170    case __DRI2_RENDERER_VENDOR_ID:
 171       value[0] = swrast_vendor_string;
 172       return 0;
 173    case __DRI2_RENDERER_DEVICE_ID:
 174       value[0] = swrast_renderer_string;
 175       return 0;
 176    default:
 177       return -1;
 178    }
 179 }
 180
 181 static const __DRI2rendererQueryExtension swrast_query_renderer_extension = {
 182    .base = { __DRI2_RENDERER_QUERY, 1 },
 183
 184    .queryInteger        = swrast_query_renderer_integer,
 185    .queryString         = swrast_query_renderer_string
 186 };
 187
 188 static const __DRIextension *dri_screen_extensions[] = {
 189     &swrastTexBufferExtension.base,
 190     &swrast_query_renderer_extension.base,
 191     NULL
 192 };
 193
 194 static __DRIconfig **
 195 swrastFillInModes(__DRIscreen *psp,
 196                   unsigned pixel_bits, unsigned depth_bits,
 197                   unsigned stencil_bits, GLboolean have_back_buffer)
 198 {
 199     __DRIconfig **configs;
 200     unsigned depth_buffer_factor;
 201     unsigned back_buffer_factor;
 202     mesa_format format;
 203
 204     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 205      * support pageflipping at all.
 206      */
 207     static const GLenum back_buffer_modes[] = {
 208         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 209     };
 210
 211     uint8_t depth_bits_array[4];
 212     uint8_t stencil_bits_array[4];
 213     uint8_t msaa_samples_array[1];
 214
 215     (void) psp;
 216     (void) have_back_buffer;
 217
 218     depth_bits_array[0] = 0;
 219     depth_bits_array[1] = 0;
 220     depth_bits_array[2] = depth_bits;
 221     depth_bits_array[3] = depth_bits;
 222
 223     /* Just like with the accumulation buffer, always provide some modes
 224      * with a stencil buffer.
 225      */
 226     stencil_bits_array[0] = 0;
 227     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 228     stencil_bits_array[2] = 0;
 229     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 230
 231     msaa_samples_array[0] = 0;
 232
 233     depth_buffer_factor = 4;
 234     back_buffer_factor = 2;
 235
 236     switch (pixel_bits) {
 237     case 16:
 238         format = MESA_FORMAT_B5G6R5_UNORM;
 239         break;
 240     case 24:
 241         format = MESA_FORMAT_B8G8R8X8_UNORM;
 242         break;
 243     case 32:
 244         format = MESA_FORMAT_B8G8R8A8_UNORM;
 245         break;
 246     default:
 247         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 248                 pixel_bits);
 249         return NULL;
 250     }
 251
 252     configs = driCreateConfigs(format,
 253                                depth_bits_array, stencil_bits_array,
 254                                depth_buffer_factor, back_buffer_modes,
 255                                back_buffer_factor, msaa_samples_array, 1,
 256                                GL_TRUE);
 257     if (configs == NULL) {
 258         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 259                 __LINE__);
 260         return NULL;
 261     }
 262
 263     return configs;
 264 }
 265
 266 static const __DRIconfig **
 267 dri_init_screen(__DRIscreen * psp)
 268 {
 269     __DRIconfig **configs16, **configs24, **configs32;
 270
 271     TRACE;
 272
 273     psp->max_gl_compat_version = 21;
 274     psp->max_gl_es1_version = 11;
 275     psp->max_gl_es2_version = 20;
 276
 277     psp->extensions = dri_screen_extensions;
 278
 279     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 280     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 281     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 282
 283     configs24 = driConcatConfigs(configs16, configs24);
 284     configs32 = driConcatConfigs(configs24, configs32);
 285
 286     return (const __DRIconfig **)configs32;
 287 }
 288
 289 static void
 290 dri_destroy_screen(__DRIscreen * sPriv)
 291 {
 292     TRACE;
 293     (void) sPriv;
 294 }
 295
 296
 297 /**
 298  * Framebuffer and renderbuffer-related functions.
 299  */
 300
 301 static GLuint
 302 choose_pixel_format(const struct gl_config *v)
 303 {
 304     int depth = v->rgbBits;
 305
 306     if (depth == 32
 307         && v->redMask   == 0xff0000
 308         && v->greenMask == 0x00ff00
 309         && v->blueMask  == 0x0000ff)
 310         return PF_A8R8G8B8;
 311     else if (depth == 24
 312              && v->redMask   == 0xff0000
 313              && v->greenMask == 0x00ff00
 314              && v->blueMask  == 0x0000ff)
 315         return PF_X8R8G8B8;
 316     else if (depth == 16
 317              && v->redMask   == 0xf800
 318              && v->greenMask == 0x07e0
 319              && v->blueMask  == 0x001f)
 320         return PF_R5G6B5;
 321     else if (depth == 8
 322              && v->redMask   == 0x07
 323              && v->greenMask == 0x38
 324              && v->blueMask  == 0xc0)
 325         return PF_R3G3B2;
 326
 327     _mesa_problem( NULL, "unexpected format in %s", __FUNCTION__ );
 328     return 0;
 329 }
 330
 331 static void
 332 swrast_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
 333 {
 334     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 335
 336     TRACE;
 337
 338     free(xrb->Base.Buffer);
 339     _mesa_delete_renderbuffer(ctx, rb);
 340 }
 341
 342 /* see bytes_per_line in libGL */
 343 static INLINE int
 344 bytes_per_line(unsigned pitch_bits, unsigned mul)
 345 {
 346    unsigned mask = mul - 1;
 347
 348    return ((pitch_bits + mask) & ~mask) / 8;
 349 }
 350
 351 static GLboolean
 352 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 353                            GLenum internalFormat, GLuint width, GLuint height)
 354 {
 355     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 356
 357     TRACE;
 358
 359     (void) ctx;
 360     (void) internalFormat;
 361
 362     xrb->Base.Buffer = NULL;
 363     rb->Width = width;
 364     rb->Height = height;
 365     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 366
 367     return GL_TRUE;
 368 }
 369
 370 static GLboolean
 371 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 372                           GLenum internalFormat, GLuint width, GLuint height)
 373 {
 374     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 375
 376     TRACE;
 377
 378     free(xrb->Base.Buffer);
 379
 380     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 381
 382     xrb->Base.Buffer = malloc(height * xrb->pitch);
 383
 384     return GL_TRUE;
 385 }
 386
 387 static struct dri_swrast_renderbuffer *
 388 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 389                         GLboolean front)
 390 {
 391     struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 392     struct gl_renderbuffer *rb;
 393     GLuint pixel_format;
 394
 395     TRACE;
 396
 397     if (!xrb)
 398         return NULL;
 399
 400     rb = &xrb->Base.Base;
 401
 402     _mesa_init_renderbuffer(rb, 0);
 403
 404     pixel_format = choose_pixel_format(visual);
 405
 406     xrb->dPriv = dPriv;
 407     xrb->Base.Base.Delete = swrast_delete_renderbuffer;
 408     if (front) {
 409         rb->AllocStorage = swrast_alloc_front_storage;
 410     }
 411     else {
 412         rb->AllocStorage = swrast_alloc_back_storage;
 413     }
 414
 415     switch (pixel_format) {
 416     case PF_A8R8G8B8:
 417         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM;
 418         rb->InternalFormat = GL_RGBA;
 419         rb->_BaseFormat = GL_RGBA;
 420         xrb->bpp = 32;
 421         break;
 422     case PF_X8R8G8B8:
 423         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM; /* XXX */
 424         rb->InternalFormat = GL_RGB;
 425         rb->_BaseFormat = GL_RGB;
 426         xrb->bpp = 32;
 427         break;
 428     case PF_R5G6B5:
 429         rb->Format = MESA_FORMAT_B5G6R5_UNORM;
 430         rb->InternalFormat = GL_RGB;
 431         rb->_BaseFormat = GL_RGB;
 432         xrb->bpp = 16;
 433         break;
 434     case PF_R3G3B2:
 435         rb->Format = MESA_FORMAT_B2G3R3_UNORM;
 436         rb->InternalFormat = GL_RGB;
 437         rb->_BaseFormat = GL_RGB;
 438         xrb->bpp = 8;
 439         break;
 440     default:
 441         free(xrb);
 442         return NULL;
 443     }
 444
 445     return xrb;
 446 }
 447
 448 static void
 449 swrast_map_renderbuffer(struct gl_context *ctx,
 450                         struct gl_renderbuffer *rb,
 451                         GLuint x, GLuint y, GLuint w, GLuint h,
 452                         GLbitfield mode,
 453                         GLubyte **out_map,
 454                         GLint *out_stride)
 455 {
 456    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 457    GLubyte *map = xrb->Base.Buffer;
 458    int cpp = _mesa_get_format_bytes(rb->Format);
 459    int stride = rb->Width * cpp;
 460
 461    if (rb->AllocStorage == swrast_alloc_front_storage) {
 462       __DRIdrawable *dPriv = xrb->dPriv;
 463       __DRIscreen *sPriv = dPriv->driScreenPriv;
 464
 465       xrb->map_mode = mode;
 466       xrb->map_x = x;
 467       xrb->map_y = y;
 468       xrb->map_w = w;
 469       xrb->map_h = h;
 470
 471       stride = w * cpp;
 472       xrb->Base.Buffer = malloc(h * stride);
 473
 474       sPriv->swrast_loader->getImage(dPriv, x, rb->Height - y - h, w, h,
 475                                      (char *) xrb->Base.Buffer,
 476                                      dPriv->loaderPrivate);
 477
 478       *out_map = xrb->Base.Buffer + (h - 1) * stride;
 479       *out_stride = -stride;
 480       return;
 481    }
 482
 483    ASSERT(xrb->Base.Buffer);
 484
 485    if (rb->AllocStorage == swrast_alloc_back_storage) {
 486       map += (rb->Height - 1) * stride;
 487       stride = -stride;
 488    }
 489
 490    map += (GLsizei)y * stride;
 491    map += (GLsizei)x * cpp;
 492
 493    *out_map = map;
 494    *out_stride = stride;
 495 }
 496
 497 static void
 498 swrast_unmap_renderbuffer(struct gl_context *ctx,
 499                           struct gl_renderbuffer *rb)
 500 {
 501    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 502
 503    if (rb->AllocStorage == swrast_alloc_front_storage) {
 504       __DRIdrawable *dPriv = xrb->dPriv;
 505       __DRIscreen *sPriv = dPriv->driScreenPriv;
 506
 507       if (xrb->map_mode & GL_MAP_WRITE_BIT) {
 508          sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
 509                                         xrb->map_x, xrb->map_y,
 510                                         xrb->map_w, xrb->map_h,
 511                                         (char *) xrb->Base.Buffer,
 512                                         dPriv->loaderPrivate);
 513       }
 514
 515       free(xrb->Base.Buffer);
 516       xrb->Base.Buffer = NULL;
 517    }
 518 }
 519
 520 static GLboolean
 521 dri_create_buffer(__DRIscreen * sPriv,
 522                   __DRIdrawable * dPriv,
 523                   const struct gl_config * visual, GLboolean isPixmap)
 524 {
 525     struct dri_drawable *drawable = NULL;
 526     struct gl_framebuffer *fb;
 527     struct dri_swrast_renderbuffer *frontrb, *backrb;
 528
 529     TRACE;
 530
 531     (void) sPriv;
 532     (void) isPixmap;
 533
 534     drawable = CALLOC_STRUCT(dri_drawable);
 535     if (drawable == NULL)
 536         goto drawable_fail;
 537
 538     dPriv->driverPrivate = drawable;
 539     drawable->dPriv = dPriv;
 540
 541     drawable->row = malloc(SWRAST_MAX_WIDTH * 4);
 542     if (drawable->row == NULL)
 543         goto drawable_fail;
 544
 545     fb = &drawable->Base;
 546
 547     /* basic framebuffer setup */
 548     _mesa_initialize_window_framebuffer(fb, visual);
 549
 550     /* add front renderbuffer */
 551     frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
 552     _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontrb->Base.Base);
 553
 554     /* add back renderbuffer */
 555     if (visual->doubleBufferMode) {
 556         backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
 557         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backrb->Base.Base);
 558     }
 559
 560     /* add software renderbuffers */
 561     _swrast_add_soft_renderbuffers(fb,
 562                                    GL_FALSE, /* color */
 563                                    visual->haveDepthBuffer,
 564                                    visual->haveStencilBuffer,
 565                                    visual->haveAccumBuffer,
 566                                    GL_FALSE, /* alpha */
 567                                    GL_FALSE /* aux bufs */);
 568
 569     return GL_TRUE;
 570
 571 drawable_fail:
 572
 573     if (drawable)
 574         free(drawable->row);
 575
 576     free(drawable);
 577
 578     return GL_FALSE;
 579 }
 580
 581 static void
 582 dri_destroy_buffer(__DRIdrawable * dPriv)
 583 {
 584     TRACE;
 585
 586     if (dPriv) {
 587         struct dri_drawable *drawable = dri_drawable(dPriv);
 588         struct gl_framebuffer *fb;
 589
 590         free(drawable->row);
 591
 592         fb = &drawable->Base;
 593
 594         fb->DeletePending = GL_TRUE;
 595         _mesa_reference_framebuffer(&fb, NULL);
 596     }
 597 }
 598
 599 static void
 600 dri_swap_buffers(__DRIdrawable * dPriv)
 601 {
 602     __DRIscreen *sPriv = dPriv->driScreenPriv;
 603
 604     GET_CURRENT_CONTEXT(ctx);
 605
 606     struct dri_drawable *drawable = dri_drawable(dPriv);
 607     struct gl_framebuffer *fb;
 608     struct dri_swrast_renderbuffer *frontrb, *backrb;
 609
 610     TRACE;
 611
 612     fb = &drawable->Base;
 613
 614     frontrb =
 615         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 616     backrb =
 617         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 618
 619     /* check for signle-buffered */
 620     if (backrb == NULL)
 621         return;
 622
 623     /* check if swapping currently bound buffer */
 624     if (ctx && ctx->DrawBuffer == fb) {
 625         /* flush pending rendering */
 626         _mesa_notifySwapBuffers(ctx);
 627     }
 628
 629     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 630                                    0, 0,
 631                                    frontrb->Base.Base.Width,
 632                                    frontrb->Base.Base.Height,
 633                                    (char *) backrb->Base.Buffer,
 634                                    dPriv->loaderPrivate);
 635 }
 636
 637
 638 /**
 639  * General device driver functions.
 640  */
 641
 642 static void
 643 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 644 {
 645     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 646     __DRIscreen *sPriv = dPriv->driScreenPriv;
 647     int x, y;
 648
 649     sPriv->swrast_loader->getDrawableInfo(dPriv,
 650                                           &x, &y, w, h,
 651                                           dPriv->loaderPrivate);
 652 }
 653
 654 static void
 655 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 656 {
 657     GLsizei width, height;
 658
 659     get_window_size(fb, &width, &height);
 660     if (fb->Width != width || fb->Height != height) {
 661         _mesa_resize_framebuffer(ctx, fb, width, height);
 662     }
 663 }
 664
 665 static const GLubyte *
 666 get_string(struct gl_context *ctx, GLenum pname)
 667 {
 668     (void) ctx;
 669     switch (pname) {
 670         case GL_VENDOR:
 671             return (const GLubyte *) swrast_vendor_string;
 672         case GL_RENDERER:
 673             return (const GLubyte *) swrast_renderer_string;
 674         default:
 675             return NULL;
 676     }
 677 }
 678
 679 static void
 680 update_state( struct gl_context *ctx, GLuint new_state )
 681 {
 682     /* not much to do here - pass it on */
 683     _swrast_InvalidateState( ctx, new_state );
 684     _swsetup_InvalidateState( ctx, new_state );
 685     _vbo_InvalidateState( ctx, new_state );
 686     _tnl_InvalidateState( ctx, new_state );
 687 }
 688
 689 static void
 690 viewport(struct gl_context *ctx)
 691 {
 692     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 693     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 694
 695     swrast_check_and_update_window_size(ctx, draw);
 696     swrast_check_and_update_window_size(ctx, read);
 697 }
 698
 699 static mesa_format swrastChooseTextureFormat(struct gl_context * ctx,
 700                                            GLenum target,
 701                                            GLint internalFormat,
 702                                            GLenum format,
 703                                            GLenum type)
 704 {
 705     if (internalFormat == GL_RGB)
 706         return MESA_FORMAT_B8G8R8X8_UNORM;
 707     return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
 708 }
 709
 710 static void
 711 swrast_init_driver_functions(struct dd_function_table *driver)
 712 {
 713     driver->GetString = get_string;
 714     driver->UpdateState = update_state;
 715     driver->Viewport = viewport;
 716     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 717     driver->MapRenderbuffer = swrast_map_renderbuffer;
 718     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 719 }
 720
 721 /**
 722  * Context-related functions.
 723  */
 724
 725 static GLboolean
 726 dri_create_context(gl_api api,
 727                    const struct gl_config * visual,
 728                    __DRIcontext * cPriv,
 729                    unsigned major_version,
 730                    unsigned minor_version,
 731                    uint32_t flags,
 732                    bool notify_reset,
 733                    unsigned *error,
 734                    void *sharedContextPrivate)
 735 {
 736     struct dri_context *ctx = NULL;
 737     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 738     struct gl_context *mesaCtx = NULL;
 739     struct gl_context *sharedCtx = NULL;
 740     struct dd_function_table functions;
 741
 742     TRACE;
 743
 744     /* Flag filtering is handled in dri2CreateContextAttribs.
 745      */
 746     (void) flags;
 747
 748     ctx = CALLOC_STRUCT(dri_context);
 749     if (ctx == NULL) {
 750         *error = __DRI_CTX_ERROR_NO_MEMORY;
 751         goto context_fail;
 752     }
 753
 754     cPriv->driverPrivate = ctx;
 755     ctx->cPriv = cPriv;
 756
 757     /* build table of device driver functions */
 758     _mesa_init_driver_functions(&functions);
 759     swrast_init_driver_functions(&functions);
 760
 761     if (share) {
 762         sharedCtx = &share->Base;
 763     }
 764
 765     mesaCtx = &ctx->Base;
 766
 767     /* basic context setup */
 768     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions)) {
 769         *error = __DRI_CTX_ERROR_NO_MEMORY;
 770         goto context_fail;
 771     }
 772
 773     driContextSetFlags(mesaCtx, flags);
 774
 775     /* create module contexts */
 776     _swrast_CreateContext( mesaCtx );
 777     _vbo_CreateContext( mesaCtx );
 778     _tnl_CreateContext( mesaCtx );
 779     _swsetup_CreateContext( mesaCtx );
 780     _swsetup_Wakeup( mesaCtx );
 781
 782     /* use default TCL pipeline */
 783     {
 784        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 785        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 786     }
 787
 788     _mesa_meta_init(mesaCtx);
 789     _mesa_enable_sw_extensions(mesaCtx);
 790
 791     _mesa_compute_version(mesaCtx);
 792
 793     _mesa_initialize_dispatch_tables(mesaCtx);
 794     _mesa_initialize_vbo_vtxfmt(mesaCtx);
 795
 796     *error = __DRI_CTX_ERROR_SUCCESS;
 797     return GL_TRUE;
 798
 799 context_fail:
 800
 801     free(ctx);
 802
 803     return GL_FALSE;
 804 }
 805
 806 static void
 807 dri_destroy_context(__DRIcontext * cPriv)
 808 {
 809     TRACE;
 810
 811     if (cPriv) {
 812         struct dri_context *ctx = dri_context(cPriv);
 813         struct gl_context *mesaCtx;
 814
 815         mesaCtx = &ctx->Base;
 816
 817         _mesa_meta_free(mesaCtx);
 818         _swsetup_DestroyContext( mesaCtx );
 819         _swrast_DestroyContext( mesaCtx );
 820         _tnl_DestroyContext( mesaCtx );
 821         _vbo_DestroyContext( mesaCtx );
 822         _mesa_destroy_context( mesaCtx );
 823     }
 824 }
 825
 826 static GLboolean
 827 dri_make_current(__DRIcontext * cPriv,
 828                  __DRIdrawable * driDrawPriv,
 829                  __DRIdrawable * driReadPriv)
 830 {
 831     struct gl_context *mesaCtx;
 832     struct gl_framebuffer *mesaDraw;
 833     struct gl_framebuffer *mesaRead;
 834     TRACE;
 835
 836     if (cPriv) {
 837         struct dri_context *ctx = dri_context(cPriv);
 838         struct dri_drawable *draw;
 839         struct dri_drawable *read;
 840
 841         if (!driDrawPriv || !driReadPriv)
 842             return GL_FALSE;
 843
 844         draw = dri_drawable(driDrawPriv);
 845         read = dri_drawable(driReadPriv);
 846         mesaCtx = &ctx->Base;
 847         mesaDraw = &draw->Base;
 848         mesaRead = &read->Base;
 849
 850         /* check for same context and buffer */
 851         if (mesaCtx == _mesa_get_current_context()
 852             && mesaCtx->DrawBuffer == mesaDraw
 853             && mesaCtx->ReadBuffer == mesaRead) {
 854             return GL_TRUE;
 855         }
 856
 857         _glapi_check_multithread();
 858
 859         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 860         if (mesaRead != mesaDraw)
 861             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 862
 863         _mesa_make_current( mesaCtx,
 864                             mesaDraw,
 865                             mesaRead );
 866     }
 867     else {
 868         /* unbind */
 869         _mesa_make_current( NULL, NULL, NULL );
 870     }
 871
 872     return GL_TRUE;
 873 }
 874
 875 static GLboolean
 876 dri_unbind_context(__DRIcontext * cPriv)
 877 {
 878     TRACE;
 879     (void) cPriv;
 880
 881     /* Unset current context and dispath table */
 882     _mesa_make_current(NULL, NULL, NULL);
 883
 884     return GL_TRUE;
 885 }
 886
 887 static void
 888 dri_copy_sub_buffer(__DRIdrawable *dPriv, int x, int y,
 889                     int w, int h)
 890 {
 891     __DRIscreen *sPriv = dPriv->driScreenPriv;
 892     void *data;
 893     int iy;
 894     struct dri_drawable *drawable = dri_drawable(dPriv);
 895     struct gl_framebuffer *fb;
 896     struct dri_swrast_renderbuffer *frontrb, *backrb;
 897
 898     TRACE;
 899
 900     fb = &drawable->Base;
 901
 902     frontrb =
 903         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 904     backrb =
 905         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 906
 907     /* check for signle-buffered */
 908     if (backrb == NULL)
 909        return;
 910
 911     iy = frontrb->Base.Base.Height - y - h;
 912     data = (char *)backrb->Base.Buffer + (iy * backrb->pitch) + (x * ((backrb->bpp + 7) / 8));
 913     sPriv->swrast_loader->putImage2(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 914                                     x, iy, w, h,
 915                                     frontrb->pitch,
 916                                     data,
 917                                     dPriv->loaderPrivate);
 918 }
 919
 920
 921 static const struct __DriverAPIRec swrast_driver_api = {
 922     .InitScreen = dri_init_screen,
 923     .DestroyScreen = dri_destroy_screen,
 924     .CreateContext = dri_create_context,
 925     .DestroyContext = dri_destroy_context,
 926     .CreateBuffer = dri_create_buffer,
 927     .DestroyBuffer = dri_destroy_buffer,
 928     .SwapBuffers = dri_swap_buffers,
 929     .MakeCurrent = dri_make_current,
 930     .UnbindContext = dri_unbind_context,
 931     .CopySubBuffer = dri_copy_sub_buffer,
 932 };
 933
 934 static const struct __DRIDriverVtableExtensionRec swrast_vtable = {
 935    .base = { __DRI_DRIVER_VTABLE, 1 },
 936    .vtable = &swrast_driver_api,
 937 };
 938
 939 static const __DRIextension *swrast_driver_extensions[] = {
 940     &driCoreExtension.base,
 941     &driSWRastExtension.base,
 942     &driCopySubBufferExtension.base,
 943     &swrast_vtable.base,
 944     NULL
 945 };
 946
 947 PUBLIC const __DRIextension **__driDriverGetExtensions_swrast(void)
 948 {
 949    globalDriverAPI = &swrast_driver_api;
 950
 951    return swrast_driver_extensions;
 952 }