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 <stdio.h>
  36 #include "main/api_exec.h"
  37 #include "main/context.h"
  38 #include "main/extensions.h"
  39 #include "main/formats.h"
  40 #include "main/framebuffer.h"
  41 #include "main/imports.h"
  42 #include "main/renderbuffer.h"
  43 #include "main/version.h"
  44 #include "main/vtxfmt.h"
  45 #include "swrast/swrast.h"
  46 #include "swrast/s_renderbuffer.h"
  47 #include "swrast_setup/swrast_setup.h"
  48 #include "tnl/tnl.h"
  49 #include "tnl/t_context.h"
  50 #include "tnl/t_pipeline.h"
  51 #include "vbo/vbo.h"
  52 #include "drivers/common/driverfuncs.h"
  53 #include "drivers/common/meta.h"
  54 #include "utils.h"
  55
  56 #include "main/teximage.h"
  57 #include "main/texformat.h"
  58 #include "main/texobj.h"
  59 #include "main/texstate.h"
  60
  61 #include "swrast_priv.h"
  62 #include "swrast/s_context.h"
  63
  64 #include <sys/types.h>
  65 #ifdef HAVE_SYS_SYSCTL_H
  66 # include <sys/sysctl.h>
  67 #endif
  68
  69 const __DRIextension **__driDriverGetExtensions_swrast(void);
  70
  71 const char * const swrast_vendor_string = "Mesa Project";
  72 const char * const swrast_renderer_string = "Software Rasterizer";
  73
  74 /**
  75  * Screen and config-related functions
  76  */
  77
  78 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  79                                 GLint texture_format, __DRIdrawable *dPriv)
  80 {
  81     struct dri_context *dri_ctx;
  82     int x, y, w, h;
  83     __DRIscreen *sPriv = dPriv->driScreenPriv;
  84     struct gl_texture_object *texObj;
  85     struct gl_texture_image *texImage;
  86     struct swrast_texture_image *swImage;
  87     uint32_t internalFormat;
  88     mesa_format texFormat;
  89
  90     dri_ctx = pDRICtx->driverPrivate;
  91
  92     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  93
  94     texObj = _mesa_get_current_tex_object(&dri_ctx->Base, target);
  95     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  96     swImage = swrast_texture_image(texImage);
  97
  98     _mesa_lock_texture(&dri_ctx->Base, texObj);
  99
 100     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
 101
 102     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
 103         texFormat = MESA_FORMAT_B8G8R8X8_UNORM;
 104     else
 105         texFormat = MESA_FORMAT_B8G8R8A8_UNORM;
 106
 107     _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
 108                                w, h, 1, 0, internalFormat, texFormat);
 109
 110     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
 111                                    dPriv->loaderPrivate);
 112
 113     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 114 }
 115
 116 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 117                                __DRIdrawable *dPriv)
 118 {
 119     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 120 }
 121
 122 static const __DRItexBufferExtension swrastTexBufferExtension = {
 123    .base = { __DRI_TEX_BUFFER, 3 },
 124
 125    .setTexBuffer        = swrastSetTexBuffer,
 126    .setTexBuffer2       = swrastSetTexBuffer2,
 127    .releaseTexBuffer    = NULL,
 128 };
 129
 130
 131 static int
 132 swrast_query_renderer_integer(__DRIscreen *psp, int param,
 133                                unsigned int *value)
 134 {
 135    switch (param) {
 136    case __DRI2_RENDERER_VENDOR_ID:
 137    case __DRI2_RENDERER_DEVICE_ID:
 138       /* Return 0xffffffff for both vendor and device id */
 139       value[0] = 0xffffffff;
 140       return 0;
 141    case __DRI2_RENDERER_ACCELERATED:
 142       value[0] = 0;
 143       return 0;
 144    case __DRI2_RENDERER_VIDEO_MEMORY: {
 145       /* This should probably share code with os_get_total_physical_memory()
 146        * from src/gallium/auxiliary/os/os_misc.c
 147        */
 148 #if defined(CTL_HW) && defined(HW_MEMSIZE)
 149         int mib[2] = { CTL_HW, HW_MEMSIZE };
 150         unsigned long system_memory_bytes;
 151         size_t len = sizeof(system_memory_bytes);
 152         if (sysctl(mib, 2, &system_memory_bytes, &len, NULL, 0) != 0)
 153             return -1;
 154 #elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
 155       /* XXX: Do we want to return the full amount of system memory ? */
 156       const long system_memory_pages = sysconf(_SC_PHYS_PAGES);
 157       const long system_page_size = sysconf(_SC_PAGE_SIZE);
 158
 159       if (system_memory_pages <= 0 || system_page_size <= 0)
 160          return -1;
 161
 162       const uint64_t system_memory_bytes = (uint64_t) system_memory_pages
 163          * (uint64_t) system_page_size;
 164 #else
 165 #error "Unsupported platform"
 166 #endif
 167
 168       const unsigned system_memory_megabytes =
 169          (unsigned) (system_memory_bytes / (1024 * 1024));
 170
 171       value[0] = system_memory_megabytes;
 172       return 0;
 173    }
 174    case __DRI2_RENDERER_UNIFIED_MEMORY_ARCHITECTURE:
 175       /**
 176        * XXX: Perhaps we should return 1 ?
 177        * See issue #7 from the spec, currently UNRESOLVED.
 178        */
 179       value[0] = 0;
 180       return 0;
 181    default:
 182       return driQueryRendererIntegerCommon(psp, param, value);
 183    }
 184 }
 185
 186 static int
 187 swrast_query_renderer_string(__DRIscreen *psp, int param, const char **value)
 188 {
 189    switch (param) {
 190    case __DRI2_RENDERER_VENDOR_ID:
 191       value[0] = swrast_vendor_string;
 192       return 0;
 193    case __DRI2_RENDERER_DEVICE_ID:
 194       value[0] = swrast_renderer_string;
 195       return 0;
 196    default:
 197       return -1;
 198    }
 199 }
 200
 201 static const __DRI2rendererQueryExtension swrast_query_renderer_extension = {
 202    .base = { __DRI2_RENDERER_QUERY, 1 },
 203
 204    .queryInteger        = swrast_query_renderer_integer,
 205    .queryString         = swrast_query_renderer_string
 206 };
 207
 208 static const __DRIextension *dri_screen_extensions[] = {
 209     &swrastTexBufferExtension.base,
 210     &swrast_query_renderer_extension.base,
 211     &dri2NoErrorExtension.base,
 212     NULL
 213 };
 214
 215 static __DRIconfig **
 216 swrastFillInModes(__DRIscreen *psp,
 217                   unsigned pixel_bits, unsigned depth_bits,
 218                   unsigned stencil_bits, GLboolean have_back_buffer)
 219 {
 220     __DRIconfig **configs;
 221     unsigned depth_buffer_factor;
 222     unsigned back_buffer_factor;
 223     mesa_format format;
 224
 225     /* GLX_SWAP_COPY_OML is only supported because the Intel driver doesn't
 226      * support pageflipping at all.
 227      */
 228     static const GLenum back_buffer_modes[] = {
 229         GLX_NONE, GLX_SWAP_UNDEFINED_OML
 230     };
 231
 232     uint8_t depth_bits_array[4];
 233     uint8_t stencil_bits_array[4];
 234     uint8_t msaa_samples_array[1];
 235
 236     (void) psp;
 237     (void) have_back_buffer;
 238
 239     depth_bits_array[0] = 0;
 240     depth_bits_array[1] = 0;
 241     depth_bits_array[2] = depth_bits;
 242     depth_bits_array[3] = depth_bits;
 243
 244     /* Just like with the accumulation buffer, always provide some modes
 245      * with a stencil buffer.
 246      */
 247     stencil_bits_array[0] = 0;
 248     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 249     stencil_bits_array[2] = 0;
 250     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 251
 252     msaa_samples_array[0] = 0;
 253
 254     depth_buffer_factor = 4;
 255     back_buffer_factor = 2;
 256
 257     switch (pixel_bits) {
 258     case 16:
 259         format = MESA_FORMAT_B5G6R5_UNORM;
 260         break;
 261     case 24:
 262         format = MESA_FORMAT_B8G8R8X8_UNORM;
 263         break;
 264     case 32:
 265         format = MESA_FORMAT_B8G8R8A8_UNORM;
 266         break;
 267     default:
 268         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 269                 pixel_bits);
 270         return NULL;
 271     }
 272
 273     configs = driCreateConfigs(format,
 274                                depth_bits_array, stencil_bits_array,
 275                                depth_buffer_factor, back_buffer_modes,
 276                                back_buffer_factor, msaa_samples_array, 1,
 277                                GL_TRUE, GL_FALSE);
 278     if (configs == NULL) {
 279         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 280                 __LINE__);
 281         return NULL;
 282     }
 283
 284     return configs;
 285 }
 286
 287 static const __DRIconfig **
 288 dri_init_screen(__DRIscreen * psp)
 289 {
 290     __DRIconfig **configs16, **configs24, **configs32;
 291
 292     TRACE;
 293
 294     psp->max_gl_compat_version = 21;
 295     psp->max_gl_es1_version = 11;
 296     psp->max_gl_es2_version = 20;
 297
 298     psp->extensions = dri_screen_extensions;
 299
 300     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 301     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 302     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 303
 304     configs24 = driConcatConfigs(configs16, configs24);
 305     configs32 = driConcatConfigs(configs24, configs32);
 306
 307     return (const __DRIconfig **)configs32;
 308 }
 309
 310 static void
 311 dri_destroy_screen(__DRIscreen * sPriv)
 312 {
 313     TRACE;
 314     (void) sPriv;
 315 }
 316
 317
 318 /**
 319  * Framebuffer and renderbuffer-related functions.
 320  */
 321
 322 static GLuint
 323 choose_pixel_format(const struct gl_config *v)
 324 {
 325     int depth = v->rgbBits;
 326
 327     if (depth == 32
 328         && v->redMask   == 0xff0000
 329         && v->greenMask == 0x00ff00
 330         && v->blueMask  == 0x0000ff)
 331         return PF_A8R8G8B8;
 332     else if (depth == 24
 333              && v->redMask   == 0xff0000
 334              && v->greenMask == 0x00ff00
 335              && v->blueMask  == 0x0000ff)
 336         return PF_X8R8G8B8;
 337     else if (depth == 16
 338              && v->redMask   == 0xf800
 339              && v->greenMask == 0x07e0
 340              && v->blueMask  == 0x001f)
 341         return PF_R5G6B5;
 342     else if (depth == 8
 343              && v->redMask   == 0x07
 344              && v->greenMask == 0x38
 345              && v->blueMask  == 0xc0)
 346         return PF_R3G3B2;
 347
 348     _mesa_problem( NULL, "unexpected format in %s", __func__ );
 349     return 0;
 350 }
 351
 352 static void
 353 swrast_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
 354 {
 355     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 356
 357     TRACE;
 358
 359     free(xrb->Base.Buffer);
 360     _mesa_delete_renderbuffer(ctx, rb);
 361 }
 362
 363 /* see bytes_per_line in libGL */
 364 static inline int
 365 bytes_per_line(unsigned pitch_bits, unsigned mul)
 366 {
 367    unsigned mask = mul - 1;
 368
 369    return ((pitch_bits + mask) & ~mask) / 8;
 370 }
 371
 372 static GLboolean
 373 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 374                            GLenum internalFormat, GLuint width, GLuint height)
 375 {
 376     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 377
 378     TRACE;
 379
 380     (void) ctx;
 381     (void) internalFormat;
 382
 383     xrb->Base.Buffer = NULL;
 384     rb->Width = width;
 385     rb->Height = height;
 386     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 387
 388     return GL_TRUE;
 389 }
 390
 391 static GLboolean
 392 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 393                           GLenum internalFormat, GLuint width, GLuint height)
 394 {
 395     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 396
 397     TRACE;
 398
 399     free(xrb->Base.Buffer);
 400
 401     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 402
 403     xrb->Base.Buffer = malloc(height * xrb->pitch);
 404
 405     return GL_TRUE;
 406 }
 407
 408 static struct dri_swrast_renderbuffer *
 409 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 410                         GLboolean front)
 411 {
 412     struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 413     struct gl_renderbuffer *rb;
 414     GLuint pixel_format;
 415
 416     TRACE;
 417
 418     if (!xrb)
 419         return NULL;
 420
 421     rb = &xrb->Base.Base;
 422
 423     _mesa_init_renderbuffer(rb, 0);
 424
 425     pixel_format = choose_pixel_format(visual);
 426
 427     xrb->dPriv = dPriv;
 428     xrb->Base.Base.Delete = swrast_delete_renderbuffer;
 429     if (front) {
 430         rb->AllocStorage = swrast_alloc_front_storage;
 431     }
 432     else {
 433         rb->AllocStorage = swrast_alloc_back_storage;
 434     }
 435
 436     switch (pixel_format) {
 437     case PF_A8R8G8B8:
 438         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM;
 439         rb->InternalFormat = GL_RGBA;
 440         rb->_BaseFormat = GL_RGBA;
 441         xrb->bpp = 32;
 442         break;
 443     case PF_X8R8G8B8:
 444         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM; /* XXX */
 445         rb->InternalFormat = GL_RGB;
 446         rb->_BaseFormat = GL_RGB;
 447         xrb->bpp = 32;
 448         break;
 449     case PF_R5G6B5:
 450         rb->Format = MESA_FORMAT_B5G6R5_UNORM;
 451         rb->InternalFormat = GL_RGB;
 452         rb->_BaseFormat = GL_RGB;
 453         xrb->bpp = 16;
 454         break;
 455     case PF_R3G3B2:
 456         rb->Format = MESA_FORMAT_B2G3R3_UNORM;
 457         rb->InternalFormat = GL_RGB;
 458         rb->_BaseFormat = GL_RGB;
 459         xrb->bpp = 8;
 460         break;
 461     default:
 462         free(xrb);
 463         return NULL;
 464     }
 465
 466     return xrb;
 467 }
 468
 469 static void
 470 swrast_map_renderbuffer(struct gl_context *ctx,
 471                         struct gl_renderbuffer *rb,
 472                         GLuint x, GLuint y, GLuint w, GLuint h,
 473                         GLbitfield mode,
 474                         GLubyte **out_map,
 475                         GLint *out_stride)
 476 {
 477    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 478    GLubyte *map = xrb->Base.Buffer;
 479    int cpp = _mesa_get_format_bytes(rb->Format);
 480    int stride = rb->Width * cpp;
 481
 482    if (rb->AllocStorage == swrast_alloc_front_storage) {
 483       __DRIdrawable *dPriv = xrb->dPriv;
 484       __DRIscreen *sPriv = dPriv->driScreenPriv;
 485
 486       xrb->map_mode = mode;
 487       xrb->map_x = x;
 488       xrb->map_y = rb->Height - y - h;
 489       xrb->map_w = w;
 490       xrb->map_h = h;
 491
 492       stride = w * cpp;
 493       xrb->Base.Buffer = malloc(h * stride);
 494
 495       sPriv->swrast_loader->getImage(dPriv, x, xrb->map_y, w, h,
 496                                      (char *) xrb->Base.Buffer,
 497                                      dPriv->loaderPrivate);
 498
 499       *out_map = xrb->Base.Buffer + (h - 1) * stride;
 500       *out_stride = -stride;
 501       return;
 502    }
 503
 504    assert(xrb->Base.Buffer);
 505
 506    if (rb->AllocStorage == swrast_alloc_back_storage) {
 507       map += (rb->Height - 1) * stride;
 508       stride = -stride;
 509    }
 510
 511    map += (GLsizei)y * stride;
 512    map += (GLsizei)x * cpp;
 513
 514    *out_map = map;
 515    *out_stride = stride;
 516 }
 517
 518 static void
 519 swrast_unmap_renderbuffer(struct gl_context *ctx,
 520                           struct gl_renderbuffer *rb)
 521 {
 522    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 523
 524    if (rb->AllocStorage == swrast_alloc_front_storage) {
 525       __DRIdrawable *dPriv = xrb->dPriv;
 526       __DRIscreen *sPriv = dPriv->driScreenPriv;
 527
 528       if (xrb->map_mode & GL_MAP_WRITE_BIT) {
 529          sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
 530                                         xrb->map_x, xrb->map_y,
 531                                         xrb->map_w, xrb->map_h,
 532                                         (char *) xrb->Base.Buffer,
 533                                         dPriv->loaderPrivate);
 534       }
 535
 536       free(xrb->Base.Buffer);
 537       xrb->Base.Buffer = NULL;
 538    }
 539 }
 540
 541 static GLboolean
 542 dri_create_buffer(__DRIscreen * sPriv,
 543                   __DRIdrawable * dPriv,
 544                   const struct gl_config * visual, GLboolean isPixmap)
 545 {
 546     struct dri_drawable *drawable = NULL;
 547     struct gl_framebuffer *fb;
 548     struct dri_swrast_renderbuffer *frontrb, *backrb;
 549
 550     TRACE;
 551
 552     (void) sPriv;
 553     (void) isPixmap;
 554
 555     drawable = CALLOC_STRUCT(dri_drawable);
 556     if (drawable == NULL)
 557         goto drawable_fail;
 558
 559     dPriv->driverPrivate = drawable;
 560     drawable->dPriv = dPriv;
 561
 562     drawable->row = malloc(SWRAST_MAX_WIDTH * 4);
 563     if (drawable->row == NULL)
 564         goto drawable_fail;
 565
 566     fb = &drawable->Base;
 567
 568     /* basic framebuffer setup */
 569     _mesa_initialize_window_framebuffer(fb, visual);
 570
 571     /* add front renderbuffer */
 572     frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
 573     _mesa_attach_and_own_rb(fb, BUFFER_FRONT_LEFT, &frontrb->Base.Base);
 574
 575     /* add back renderbuffer */
 576     if (visual->doubleBufferMode) {
 577         backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
 578         _mesa_attach_and_own_rb(fb, BUFFER_BACK_LEFT, &backrb->Base.Base);
 579     }
 580
 581     /* add software renderbuffers */
 582     _swrast_add_soft_renderbuffers(fb,
 583                                    GL_FALSE, /* color */
 584                                    visual->haveDepthBuffer,
 585                                    visual->haveStencilBuffer,
 586                                    visual->haveAccumBuffer,
 587                                    GL_FALSE, /* alpha */
 588                                    GL_FALSE /* aux bufs */);
 589
 590     return GL_TRUE;
 591
 592 drawable_fail:
 593
 594     if (drawable)
 595         free(drawable->row);
 596
 597     free(drawable);
 598
 599     return GL_FALSE;
 600 }
 601
 602 static void
 603 dri_destroy_buffer(__DRIdrawable * dPriv)
 604 {
 605     TRACE;
 606
 607     if (dPriv) {
 608         struct dri_drawable *drawable = dri_drawable(dPriv);
 609         struct gl_framebuffer *fb;
 610
 611         free(drawable->row);
 612
 613         fb = &drawable->Base;
 614
 615         fb->DeletePending = GL_TRUE;
 616         _mesa_reference_framebuffer(&fb, NULL);
 617     }
 618 }
 619
 620 static void
 621 dri_swap_buffers(__DRIdrawable * dPriv)
 622 {
 623     __DRIscreen *sPriv = dPriv->driScreenPriv;
 624
 625     GET_CURRENT_CONTEXT(ctx);
 626
 627     struct dri_drawable *drawable = dri_drawable(dPriv);
 628     struct gl_framebuffer *fb;
 629     struct dri_swrast_renderbuffer *frontrb, *backrb;
 630
 631     TRACE;
 632
 633     fb = &drawable->Base;
 634
 635     frontrb =
 636         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 637     backrb =
 638         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 639
 640     /* check for signle-buffered */
 641     if (backrb == NULL)
 642         return;
 643
 644     /* check if swapping currently bound buffer */
 645     if (ctx && ctx->DrawBuffer == fb) {
 646         /* flush pending rendering */
 647         _mesa_notifySwapBuffers(ctx);
 648     }
 649
 650     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 651                                    0, 0,
 652                                    frontrb->Base.Base.Width,
 653                                    frontrb->Base.Base.Height,
 654                                    (char *) backrb->Base.Buffer,
 655                                    dPriv->loaderPrivate);
 656 }
 657
 658
 659 /**
 660  * General device driver functions.
 661  */
 662
 663 static void
 664 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 665 {
 666     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 667     __DRIscreen *sPriv = dPriv->driScreenPriv;
 668     int x, y;
 669
 670     sPriv->swrast_loader->getDrawableInfo(dPriv,
 671                                           &x, &y, w, h,
 672                                           dPriv->loaderPrivate);
 673 }
 674
 675 static void
 676 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 677 {
 678     GLsizei width, height;
 679
 680     get_window_size(fb, &width, &height);
 681     if (fb->Width != width || fb->Height != height) {
 682         _mesa_resize_framebuffer(ctx, fb, width, height);
 683     }
 684 }
 685
 686 static const GLubyte *
 687 get_string(struct gl_context *ctx, GLenum pname)
 688 {
 689     (void) ctx;
 690     switch (pname) {
 691         case GL_VENDOR:
 692             return (const GLubyte *) swrast_vendor_string;
 693         case GL_RENDERER:
 694             return (const GLubyte *) swrast_renderer_string;
 695         default:
 696             return NULL;
 697     }
 698 }
 699
 700 static void
 701 update_state(struct gl_context *ctx)
 702 {
 703     GLuint new_state = ctx->NewState;
 704
 705     if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 706       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 707
 708     /* not much to do here - pass it on */
 709     _swrast_InvalidateState( ctx, new_state );
 710     _swsetup_InvalidateState( ctx, new_state );
 711     _tnl_InvalidateState( ctx, new_state );
 712 }
 713
 714 static void
 715 viewport(struct gl_context *ctx)
 716 {
 717     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 718     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 719
 720     swrast_check_and_update_window_size(ctx, draw);
 721     swrast_check_and_update_window_size(ctx, read);
 722 }
 723
 724 static mesa_format swrastChooseTextureFormat(struct gl_context * ctx,
 725                                            GLenum target,
 726                                            GLint internalFormat,
 727                                            GLenum format,
 728                                            GLenum type)
 729 {
 730     if (internalFormat == GL_RGB)
 731         return MESA_FORMAT_B8G8R8X8_UNORM;
 732     return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
 733 }
 734
 735 static void
 736 swrast_init_driver_functions(struct dd_function_table *driver)
 737 {
 738     driver->GetString = get_string;
 739     driver->UpdateState = update_state;
 740     driver->Viewport = viewport;
 741     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 742     driver->MapRenderbuffer = swrast_map_renderbuffer;
 743     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 744 }
 745
 746 /**
 747  * Context-related functions.
 748  */
 749
 750 static GLboolean
 751 dri_create_context(gl_api api,
 752                    const struct gl_config * visual,
 753                    __DRIcontext * cPriv,
 754                    unsigned major_version,
 755                    unsigned minor_version,
 756                    uint32_t flags,
 757                    bool notify_reset,
 758                    unsigned *error,
 759                    void *sharedContextPrivate)
 760 {
 761     struct dri_context *ctx = NULL;
 762     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 763     struct gl_context *mesaCtx = NULL;
 764     struct gl_context *sharedCtx = NULL;
 765     struct dd_function_table functions;
 766
 767     TRACE;
 768
 769     /* Flag filtering is handled in dri2CreateContextAttribs.
 770      */
 771     (void) flags;
 772
 773     ctx = CALLOC_STRUCT(dri_context);
 774     if (ctx == NULL) {
 775         *error = __DRI_CTX_ERROR_NO_MEMORY;
 776         goto context_fail;
 777     }
 778
 779     cPriv->driverPrivate = ctx;
 780     ctx->cPriv = cPriv;
 781
 782     /* build table of device driver functions */
 783     _mesa_init_driver_functions(&functions);
 784     swrast_init_driver_functions(&functions);
 785
 786     if (share) {
 787         sharedCtx = &share->Base;
 788     }
 789
 790     mesaCtx = &ctx->Base;
 791
 792     /* basic context setup */
 793     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions)) {
 794         *error = __DRI_CTX_ERROR_NO_MEMORY;
 795         goto context_fail;
 796     }
 797
 798     driContextSetFlags(mesaCtx, flags);
 799
 800     /* create module contexts */
 801     _swrast_CreateContext( mesaCtx );
 802     _vbo_CreateContext( mesaCtx );
 803     _tnl_CreateContext( mesaCtx );
 804     _swsetup_CreateContext( mesaCtx );
 805     _swsetup_Wakeup( mesaCtx );
 806
 807     /* use default TCL pipeline */
 808     {
 809        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 810        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 811     }
 812
 813     _mesa_meta_init(mesaCtx);
 814     _mesa_enable_sw_extensions(mesaCtx);
 815
 816     _mesa_compute_version(mesaCtx);
 817
 818     _mesa_initialize_dispatch_tables(mesaCtx);
 819     _mesa_initialize_vbo_vtxfmt(mesaCtx);
 820
 821     *error = __DRI_CTX_ERROR_SUCCESS;
 822     return GL_TRUE;
 823
 824 context_fail:
 825
 826     free(ctx);
 827
 828     return GL_FALSE;
 829 }
 830
 831 static void
 832 dri_destroy_context(__DRIcontext * cPriv)
 833 {
 834     TRACE;
 835
 836     if (cPriv) {
 837         struct dri_context *ctx = dri_context(cPriv);
 838         struct gl_context *mesaCtx;
 839
 840         mesaCtx = &ctx->Base;
 841
 842         _mesa_meta_free(mesaCtx);
 843         _swsetup_DestroyContext( mesaCtx );
 844         _swrast_DestroyContext( mesaCtx );
 845         _tnl_DestroyContext( mesaCtx );
 846         _vbo_DestroyContext( mesaCtx );
 847         _mesa_destroy_context( mesaCtx );
 848     }
 849 }
 850
 851 static GLboolean
 852 dri_make_current(__DRIcontext * cPriv,
 853                  __DRIdrawable * driDrawPriv,
 854                  __DRIdrawable * driReadPriv)
 855 {
 856     struct gl_context *mesaCtx;
 857     struct gl_framebuffer *mesaDraw;
 858     struct gl_framebuffer *mesaRead;
 859     TRACE;
 860
 861     if (cPriv) {
 862         struct dri_context *ctx = dri_context(cPriv);
 863         struct dri_drawable *draw;
 864         struct dri_drawable *read;
 865
 866         if (!driDrawPriv || !driReadPriv)
 867             return GL_FALSE;
 868
 869         draw = dri_drawable(driDrawPriv);
 870         read = dri_drawable(driReadPriv);
 871         mesaCtx = &ctx->Base;
 872         mesaDraw = &draw->Base;
 873         mesaRead = &read->Base;
 874
 875         /* check for same context and buffer */
 876         if (mesaCtx == _mesa_get_current_context()
 877             && mesaCtx->DrawBuffer == mesaDraw
 878             && mesaCtx->ReadBuffer == mesaRead) {
 879             return GL_TRUE;
 880         }
 881
 882         _glapi_check_multithread();
 883
 884         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 885         if (mesaRead != mesaDraw)
 886             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 887
 888         _mesa_make_current( mesaCtx,
 889                             mesaDraw,
 890                             mesaRead );
 891     }
 892     else {
 893         /* unbind */
 894         _mesa_make_current( NULL, NULL, NULL );
 895     }
 896
 897     return GL_TRUE;
 898 }
 899
 900 static GLboolean
 901 dri_unbind_context(__DRIcontext * cPriv)
 902 {
 903     TRACE;
 904     (void) cPriv;
 905
 906     /* Unset current context and dispath table */
 907     _mesa_make_current(NULL, NULL, NULL);
 908
 909     return GL_TRUE;
 910 }
 911
 912 static void
 913 dri_copy_sub_buffer(__DRIdrawable *dPriv, int x, int y,
 914                     int w, int h)
 915 {
 916     __DRIscreen *sPriv = dPriv->driScreenPriv;
 917     void *data;
 918     int iy;
 919     struct dri_drawable *drawable = dri_drawable(dPriv);
 920     struct gl_framebuffer *fb;
 921     struct dri_swrast_renderbuffer *frontrb, *backrb;
 922
 923     TRACE;
 924
 925     fb = &drawable->Base;
 926
 927     frontrb =
 928         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 929     backrb =
 930         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 931
 932     /* check for signle-buffered */
 933     if (backrb == NULL)
 934        return;
 935
 936     iy = frontrb->Base.Base.Height - y - h;
 937     data = (char *)backrb->Base.Buffer + (iy * backrb->pitch) + (x * ((backrb->bpp + 7) / 8));
 938     sPriv->swrast_loader->putImage2(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 939                                     x, iy, w, h,
 940                                     frontrb->pitch,
 941                                     data,
 942                                     dPriv->loaderPrivate);
 943 }
 944
 945
 946 static const struct __DriverAPIRec swrast_driver_api = {
 947     .InitScreen = dri_init_screen,
 948     .DestroyScreen = dri_destroy_screen,
 949     .CreateContext = dri_create_context,
 950     .DestroyContext = dri_destroy_context,
 951     .CreateBuffer = dri_create_buffer,
 952     .DestroyBuffer = dri_destroy_buffer,
 953     .SwapBuffers = dri_swap_buffers,
 954     .MakeCurrent = dri_make_current,
 955     .UnbindContext = dri_unbind_context,
 956     .CopySubBuffer = dri_copy_sub_buffer,
 957 };
 958
 959 static const struct __DRIDriverVtableExtensionRec swrast_vtable = {
 960    .base = { __DRI_DRIVER_VTABLE, 1 },
 961    .vtable = &swrast_driver_api,
 962 };
 963
 964 static const __DRIextension *swrast_driver_extensions[] = {
 965     &driCoreExtension.base,
 966     &driSWRastExtension.base,
 967     &driCopySubBufferExtension.base,
 968     &dri2ConfigQueryExtension.base,
 969     &swrast_vtable.base,
 970     NULL
 971 };
 972
 973 PUBLIC const __DRIextension **__driDriverGetExtensions_swrast(void)
 974 {
 975    globalDriverAPI = &swrast_driver_api;
 976
 977    return swrast_driver_extensions;
 978 }