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/fbobject.h"
  40 #include "main/formats.h"
  41 #include "main/framebuffer.h"
  42 #include "main/imports.h"
  43 #include "main/renderbuffer.h"
  44 #include "main/version.h"
  45 #include "main/vtxfmt.h"
  46 #include "swrast/swrast.h"
  47 #include "swrast/s_renderbuffer.h"
  48 #include "swrast_setup/swrast_setup.h"
  49 #include "tnl/tnl.h"
  50 #include "tnl/t_context.h"
  51 #include "tnl/t_pipeline.h"
  52 #include "vbo/vbo.h"
  53 #include "drivers/common/driverfuncs.h"
  54 #include "drivers/common/meta.h"
  55 #include "utils.h"
  56
  57 #include "main/teximage.h"
  58 #include "main/texformat.h"
  59 #include "main/texobj.h"
  60 #include "main/texstate.h"
  61
  62 #include "swrast_priv.h"
  63 #include "swrast/s_context.h"
  64
  65 #include <sys/types.h>
  66 #ifdef HAVE_SYS_SYSCTL_H
  67 # include <sys/sysctl.h>
  68 #endif
  69
  70 const __DRIextension **__driDriverGetExtensions_swrast(void);
  71
  72 const char * const swrast_vendor_string = "Mesa Project";
  73 const char * const swrast_renderer_string = "Software Rasterizer";
  74
  75 /**
  76  * Screen and config-related functions
  77  */
  78
  79 static void swrastSetTexBuffer2(__DRIcontext *pDRICtx, GLint target,
  80                                 GLint texture_format, __DRIdrawable *dPriv)
  81 {
  82     struct dri_context *dri_ctx;
  83     int x, y, w, h;
  84     __DRIscreen *sPriv = dPriv->driScreenPriv;
  85     struct gl_texture_object *texObj;
  86     struct gl_texture_image *texImage;
  87     struct swrast_texture_image *swImage;
  88     uint32_t internalFormat;
  89     mesa_format texFormat;
  90
  91     dri_ctx = pDRICtx->driverPrivate;
  92
  93     internalFormat = (texture_format == __DRI_TEXTURE_FORMAT_RGB ? 3 : 4);
  94
  95     texObj = _mesa_get_current_tex_object(&dri_ctx->Base, target);
  96     texImage = _mesa_get_tex_image(&dri_ctx->Base, texObj, target, 0);
  97     swImage = swrast_texture_image(texImage);
  98
  99     _mesa_lock_texture(&dri_ctx->Base, texObj);
 100
 101     sPriv->swrast_loader->getDrawableInfo(dPriv, &x, &y, &w, &h, dPriv->loaderPrivate);
 102
 103     if (texture_format == __DRI_TEXTURE_FORMAT_RGB)
 104         texFormat = MESA_FORMAT_B8G8R8X8_UNORM;
 105     else
 106         texFormat = MESA_FORMAT_B8G8R8A8_UNORM;
 107
 108     _mesa_init_teximage_fields(&dri_ctx->Base, texImage,
 109                                w, h, 1, 0, internalFormat, texFormat);
 110
 111     sPriv->swrast_loader->getImage(dPriv, x, y, w, h, (char *)swImage->Buffer,
 112                                    dPriv->loaderPrivate);
 113
 114     _mesa_unlock_texture(&dri_ctx->Base, texObj);
 115 }
 116
 117 static void swrastSetTexBuffer(__DRIcontext *pDRICtx, GLint target,
 118                                __DRIdrawable *dPriv)
 119 {
 120     swrastSetTexBuffer2(pDRICtx, target, __DRI_TEXTURE_FORMAT_RGBA, dPriv);
 121 }
 122
 123 static const __DRItexBufferExtension swrastTexBufferExtension = {
 124    .base = { __DRI_TEX_BUFFER, 3 },
 125
 126    .setTexBuffer        = swrastSetTexBuffer,
 127    .setTexBuffer2       = swrastSetTexBuffer2,
 128    .releaseTexBuffer    = NULL,
 129 };
 130
 131
 132 static int
 133 swrast_query_renderer_integer(__DRIscreen *psp, int param,
 134                                unsigned int *value)
 135 {
 136    switch (param) {
 137    case __DRI2_RENDERER_VENDOR_ID:
 138    case __DRI2_RENDERER_DEVICE_ID:
 139       /* Return 0xffffffff for both vendor and device id */
 140       value[0] = 0xffffffff;
 141       return 0;
 142    case __DRI2_RENDERER_ACCELERATED:
 143       value[0] = 0;
 144       return 0;
 145    case __DRI2_RENDERER_VIDEO_MEMORY: {
 146       /* This should probably share code with os_get_total_physical_memory()
 147        * from src/gallium/auxiliary/os/os_misc.c
 148        */
 149 #if defined(CTL_HW) && defined(HW_MEMSIZE)
 150         int mib[2] = { CTL_HW, HW_MEMSIZE };
 151         unsigned long system_memory_bytes;
 152         size_t len = sizeof(system_memory_bytes);
 153         if (sysctl(mib, 2, &system_memory_bytes, &len, NULL, 0) != 0)
 154             return -1;
 155 #elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGE_SIZE)
 156       /* XXX: Do we want to return the full amount of system memory ? */
 157       const long system_memory_pages = sysconf(_SC_PHYS_PAGES);
 158       const long system_page_size = sysconf(_SC_PAGE_SIZE);
 159
 160       if (system_memory_pages <= 0 || system_page_size <= 0)
 161          return -1;
 162
 163       const uint64_t system_memory_bytes = (uint64_t) system_memory_pages
 164          * (uint64_t) system_page_size;
 165 #else
 166 #error "Unsupported platform"
 167 #endif
 168
 169       const unsigned system_memory_megabytes =
 170          (unsigned) (system_memory_bytes / (1024 * 1024));
 171
 172       value[0] = system_memory_megabytes;
 173       return 0;
 174    }
 175    case __DRI2_RENDERER_UNIFIED_MEMORY_ARCHITECTURE:
 176       /**
 177        * XXX: Perhaps we should return 1 ?
 178        * See issue #7 from the spec, currently UNRESOLVED.
 179        */
 180       value[0] = 0;
 181       return 0;
 182    default:
 183       return driQueryRendererIntegerCommon(psp, param, value);
 184    }
 185 }
 186
 187 static int
 188 swrast_query_renderer_string(__DRIscreen *psp, int param, const char **value)
 189 {
 190    switch (param) {
 191    case __DRI2_RENDERER_VENDOR_ID:
 192       value[0] = swrast_vendor_string;
 193       return 0;
 194    case __DRI2_RENDERER_DEVICE_ID:
 195       value[0] = swrast_renderer_string;
 196       return 0;
 197    default:
 198       return -1;
 199    }
 200 }
 201
 202 static const __DRI2rendererQueryExtension swrast_query_renderer_extension = {
 203    .base = { __DRI2_RENDERER_QUERY, 1 },
 204
 205    .queryInteger        = swrast_query_renderer_integer,
 206    .queryString         = swrast_query_renderer_string
 207 };
 208
 209 static const __DRIextension *dri_screen_extensions[] = {
 210     &swrastTexBufferExtension.base,
 211     &swrast_query_renderer_extension.base,
 212     &dri2ConfigQueryExtension.base,
 213     &dri2NoErrorExtension.base,
 214     NULL
 215 };
 216
 217 static __DRIconfig **
 218 swrastFillInModes(__DRIscreen *psp,
 219                   unsigned pixel_bits, unsigned depth_bits,
 220                   unsigned stencil_bits, GLboolean have_back_buffer)
 221 {
 222     __DRIconfig **configs;
 223     unsigned depth_buffer_factor;
 224     unsigned back_buffer_factor;
 225     mesa_format format;
 226
 227     static const GLenum back_buffer_modes[] = {
 228         __DRI_ATTRIB_SWAP_NONE, __DRI_ATTRIB_SWAP_UNDEFINED
 229     };
 230
 231     uint8_t depth_bits_array[4];
 232     uint8_t stencil_bits_array[4];
 233     uint8_t msaa_samples_array[1];
 234
 235     (void) psp;
 236     (void) have_back_buffer;
 237
 238     depth_bits_array[0] = 0;
 239     depth_bits_array[1] = 0;
 240     depth_bits_array[2] = depth_bits;
 241     depth_bits_array[3] = depth_bits;
 242
 243     /* Just like with the accumulation buffer, always provide some modes
 244      * with a stencil buffer.
 245      */
 246     stencil_bits_array[0] = 0;
 247     stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;
 248     stencil_bits_array[2] = 0;
 249     stencil_bits_array[3] = (stencil_bits == 0) ? 8 : stencil_bits;
 250
 251     msaa_samples_array[0] = 0;
 252
 253     depth_buffer_factor = 4;
 254     back_buffer_factor = 2;
 255
 256     switch (pixel_bits) {
 257     case 16:
 258         format = MESA_FORMAT_B5G6R5_UNORM;
 259         break;
 260     case 24:
 261         format = MESA_FORMAT_B8G8R8X8_UNORM;
 262         break;
 263     case 32:
 264         format = MESA_FORMAT_B8G8R8A8_UNORM;
 265         break;
 266     default:
 267         fprintf(stderr, "[%s:%u] bad depth %d\n", __func__, __LINE__,
 268                 pixel_bits);
 269         return NULL;
 270     }
 271
 272     configs = driCreateConfigs(format,
 273                                depth_bits_array, stencil_bits_array,
 274                                depth_buffer_factor, back_buffer_modes,
 275                                back_buffer_factor, msaa_samples_array, 1,
 276                                GL_TRUE, GL_FALSE, GL_FALSE);
 277     if (configs == NULL) {
 278         fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
 279                 __LINE__);
 280         return NULL;
 281     }
 282
 283     return configs;
 284 }
 285
 286 static const __DRIconfig **
 287 dri_init_screen(__DRIscreen * psp)
 288 {
 289     __DRIconfig **configs16, **configs24, **configs32;
 290
 291     TRACE;
 292
 293     psp->max_gl_compat_version = 21;
 294     psp->max_gl_es1_version = 11;
 295     psp->max_gl_es2_version = 20;
 296
 297     psp->extensions = dri_screen_extensions;
 298
 299     configs16 = swrastFillInModes(psp, 16, 16, 0, 1);
 300     configs24 = swrastFillInModes(psp, 24, 24, 8, 1);
 301     configs32 = swrastFillInModes(psp, 32, 24, 8, 1);
 302
 303     configs24 = driConcatConfigs(configs16, configs24);
 304     configs32 = driConcatConfigs(configs24, configs32);
 305
 306     return (const __DRIconfig **)configs32;
 307 }
 308
 309 static void
 310 dri_destroy_screen(__DRIscreen * sPriv)
 311 {
 312     TRACE;
 313     (void) sPriv;
 314 }
 315
 316
 317 /**
 318  * Framebuffer and renderbuffer-related functions.
 319  */
 320
 321 static GLuint
 322 choose_pixel_format(const struct gl_config *v)
 323 {
 324     int depth = v->rgbBits;
 325
 326     if (depth == 32
 327         && v->redMask   == 0xff0000
 328         && v->greenMask == 0x00ff00
 329         && v->blueMask  == 0x0000ff)
 330         return PF_A8R8G8B8;
 331     else if (depth == 24
 332              && v->redMask   == 0xff0000
 333              && v->greenMask == 0x00ff00
 334              && v->blueMask  == 0x0000ff)
 335         return PF_X8R8G8B8;
 336     else if (depth == 16
 337              && v->redMask   == 0xf800
 338              && v->greenMask == 0x07e0
 339              && v->blueMask  == 0x001f)
 340         return PF_R5G6B5;
 341     else if (depth == 8
 342              && v->redMask   == 0x07
 343              && v->greenMask == 0x38
 344              && v->blueMask  == 0xc0)
 345         return PF_R3G3B2;
 346
 347     _mesa_problem( NULL, "unexpected format in %s", __func__ );
 348     return 0;
 349 }
 350
 351 static void
 352 swrast_delete_renderbuffer(struct gl_context *ctx, struct gl_renderbuffer *rb)
 353 {
 354     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 355
 356     TRACE;
 357
 358     free(xrb->Base.Buffer);
 359     _mesa_delete_renderbuffer(ctx, rb);
 360 }
 361
 362 /* see bytes_per_line in libGL */
 363 static inline int
 364 bytes_per_line(unsigned pitch_bits, unsigned mul)
 365 {
 366    unsigned mask = mul - 1;
 367
 368    return ((pitch_bits + mask) & ~mask) / 8;
 369 }
 370
 371 static GLboolean
 372 swrast_alloc_front_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 373                            GLenum internalFormat, GLuint width, GLuint height)
 374 {
 375     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 376
 377     TRACE;
 378
 379     (void) ctx;
 380     (void) internalFormat;
 381
 382     xrb->Base.Buffer = NULL;
 383     rb->Width = width;
 384     rb->Height = height;
 385     xrb->pitch = bytes_per_line(width * xrb->bpp, 32);
 386
 387     return GL_TRUE;
 388 }
 389
 390 static GLboolean
 391 swrast_alloc_back_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
 392                           GLenum internalFormat, GLuint width, GLuint height)
 393 {
 394     struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 395
 396     TRACE;
 397
 398     free(xrb->Base.Buffer);
 399
 400     swrast_alloc_front_storage(ctx, rb, internalFormat, width, height);
 401
 402     xrb->Base.Buffer = malloc(height * xrb->pitch);
 403
 404     return GL_TRUE;
 405 }
 406
 407 static struct dri_swrast_renderbuffer *
 408 swrast_new_renderbuffer(const struct gl_config *visual, __DRIdrawable *dPriv,
 409                         GLboolean front)
 410 {
 411     struct dri_swrast_renderbuffer *xrb = calloc(1, sizeof *xrb);
 412     struct gl_renderbuffer *rb;
 413     GLuint pixel_format;
 414
 415     TRACE;
 416
 417     if (!xrb)
 418         return NULL;
 419
 420     rb = &xrb->Base.Base;
 421
 422     _mesa_init_renderbuffer(rb, 0);
 423
 424     pixel_format = choose_pixel_format(visual);
 425
 426     xrb->dPriv = dPriv;
 427     xrb->Base.Base.Delete = swrast_delete_renderbuffer;
 428     if (front) {
 429         rb->AllocStorage = swrast_alloc_front_storage;
 430     }
 431     else {
 432         rb->AllocStorage = swrast_alloc_back_storage;
 433     }
 434
 435     switch (pixel_format) {
 436     case PF_A8R8G8B8:
 437         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM;
 438         rb->InternalFormat = GL_RGBA;
 439         rb->_BaseFormat = GL_RGBA;
 440         xrb->bpp = 32;
 441         break;
 442     case PF_X8R8G8B8:
 443         rb->Format = MESA_FORMAT_B8G8R8A8_UNORM; /* XXX */
 444         rb->InternalFormat = GL_RGB;
 445         rb->_BaseFormat = GL_RGB;
 446         xrb->bpp = 32;
 447         break;
 448     case PF_R5G6B5:
 449         rb->Format = MESA_FORMAT_B5G6R5_UNORM;
 450         rb->InternalFormat = GL_RGB;
 451         rb->_BaseFormat = GL_RGB;
 452         xrb->bpp = 16;
 453         break;
 454     case PF_R3G3B2:
 455         rb->Format = MESA_FORMAT_B2G3R3_UNORM;
 456         rb->InternalFormat = GL_RGB;
 457         rb->_BaseFormat = GL_RGB;
 458         xrb->bpp = 8;
 459         break;
 460     default:
 461         free(xrb);
 462         return NULL;
 463     }
 464
 465     return xrb;
 466 }
 467
 468 static void
 469 swrast_map_renderbuffer(struct gl_context *ctx,
 470                         struct gl_renderbuffer *rb,
 471                         GLuint x, GLuint y, GLuint w, GLuint h,
 472                         GLbitfield mode,
 473                         GLubyte **out_map,
 474                         GLint *out_stride,
 475                         bool flip_y)
 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    /* driver does not support GL_FRAMEBUFFER_FLIP_Y_MESA */
 483    assert((rb->Name == 0) == flip_y);
 484
 485    if (rb->AllocStorage == swrast_alloc_front_storage) {
 486       __DRIdrawable *dPriv = xrb->dPriv;
 487       __DRIscreen *sPriv = dPriv->driScreenPriv;
 488
 489       xrb->map_mode = mode;
 490       xrb->map_x = x;
 491       xrb->map_y = rb->Height - y - h;
 492       xrb->map_w = w;
 493       xrb->map_h = h;
 494
 495       stride = w * cpp;
 496       xrb->Base.Buffer = malloc(h * stride);
 497
 498       sPriv->swrast_loader->getImage(dPriv, x, xrb->map_y, w, h,
 499                                      (char *) xrb->Base.Buffer,
 500                                      dPriv->loaderPrivate);
 501
 502       *out_map = xrb->Base.Buffer + (h - 1) * stride;
 503       *out_stride = -stride;
 504       return;
 505    }
 506
 507    assert(xrb->Base.Buffer);
 508
 509    if (rb->AllocStorage == swrast_alloc_back_storage) {
 510       map += (rb->Height - 1) * stride;
 511       stride = -stride;
 512    }
 513
 514    map += (GLsizei)y * stride;
 515    map += (GLsizei)x * cpp;
 516
 517    *out_map = map;
 518    *out_stride = stride;
 519 }
 520
 521 static void
 522 swrast_unmap_renderbuffer(struct gl_context *ctx,
 523                           struct gl_renderbuffer *rb)
 524 {
 525    struct dri_swrast_renderbuffer *xrb = dri_swrast_renderbuffer(rb);
 526
 527    if (rb->AllocStorage == swrast_alloc_front_storage) {
 528       __DRIdrawable *dPriv = xrb->dPriv;
 529       __DRIscreen *sPriv = dPriv->driScreenPriv;
 530
 531       if (xrb->map_mode & GL_MAP_WRITE_BIT) {
 532          sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_DRAW,
 533                                         xrb->map_x, xrb->map_y,
 534                                         xrb->map_w, xrb->map_h,
 535                                         (char *) xrb->Base.Buffer,
 536                                         dPriv->loaderPrivate);
 537       }
 538
 539       free(xrb->Base.Buffer);
 540       xrb->Base.Buffer = NULL;
 541    }
 542 }
 543
 544 static GLboolean
 545 dri_create_buffer(__DRIscreen * sPriv,
 546                   __DRIdrawable * dPriv,
 547                   const struct gl_config * visual, GLboolean isPixmap)
 548 {
 549     struct dri_drawable *drawable = NULL;
 550     struct gl_framebuffer *fb;
 551     struct dri_swrast_renderbuffer *frontrb, *backrb;
 552
 553     TRACE;
 554
 555     (void) sPriv;
 556     (void) isPixmap;
 557
 558     drawable = CALLOC_STRUCT(dri_drawable);
 559     if (drawable == NULL)
 560         goto drawable_fail;
 561
 562     dPriv->driverPrivate = drawable;
 563     drawable->dPriv = dPriv;
 564
 565     drawable->row = malloc(SWRAST_MAX_WIDTH * 4);
 566     if (drawable->row == NULL)
 567         goto drawable_fail;
 568
 569     fb = &drawable->Base;
 570
 571     /* basic framebuffer setup */
 572     _mesa_initialize_window_framebuffer(fb, visual);
 573
 574     /* add front renderbuffer */
 575     frontrb = swrast_new_renderbuffer(visual, dPriv, GL_TRUE);
 576     _mesa_attach_and_own_rb(fb, BUFFER_FRONT_LEFT, &frontrb->Base.Base);
 577
 578     /* add back renderbuffer */
 579     if (visual->doubleBufferMode) {
 580         backrb = swrast_new_renderbuffer(visual, dPriv, GL_FALSE);
 581         _mesa_attach_and_own_rb(fb, BUFFER_BACK_LEFT, &backrb->Base.Base);
 582     }
 583
 584     /* add software renderbuffers */
 585     _swrast_add_soft_renderbuffers(fb,
 586                                    GL_FALSE, /* color */
 587                                    visual->depthBits > 0,
 588                                    visual->stencilBits > 0,
 589                                    visual->accumRedBits > 0,
 590                                    GL_FALSE, /* alpha */
 591                                    GL_FALSE /* aux bufs */);
 592
 593     return GL_TRUE;
 594
 595 drawable_fail:
 596
 597     if (drawable)
 598         free(drawable->row);
 599
 600     free(drawable);
 601
 602     return GL_FALSE;
 603 }
 604
 605 static void
 606 dri_destroy_buffer(__DRIdrawable * dPriv)
 607 {
 608     TRACE;
 609
 610     if (dPriv) {
 611         struct dri_drawable *drawable = dri_drawable(dPriv);
 612         struct gl_framebuffer *fb;
 613
 614         free(drawable->row);
 615
 616         fb = &drawable->Base;
 617
 618         fb->DeletePending = GL_TRUE;
 619         _mesa_reference_framebuffer(&fb, NULL);
 620     }
 621 }
 622
 623 static void
 624 dri_swap_buffers(__DRIdrawable * dPriv)
 625 {
 626     __DRIscreen *sPriv = dPriv->driScreenPriv;
 627
 628     GET_CURRENT_CONTEXT(ctx);
 629
 630     struct dri_drawable *drawable = dri_drawable(dPriv);
 631     struct gl_framebuffer *fb;
 632     struct dri_swrast_renderbuffer *frontrb, *backrb;
 633
 634     TRACE;
 635
 636     fb = &drawable->Base;
 637
 638     frontrb =
 639         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 640     backrb =
 641         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 642
 643     /* check for signle-buffered */
 644     if (backrb == NULL)
 645         return;
 646
 647     /* check if swapping currently bound buffer */
 648     if (ctx && ctx->DrawBuffer == fb) {
 649         /* flush pending rendering */
 650         _mesa_notifySwapBuffers(ctx);
 651     }
 652
 653     sPriv->swrast_loader->putImage(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 654                                    0, 0,
 655                                    frontrb->Base.Base.Width,
 656                                    frontrb->Base.Base.Height,
 657                                    (char *) backrb->Base.Buffer,
 658                                    dPriv->loaderPrivate);
 659 }
 660
 661
 662 /**
 663  * General device driver functions.
 664  */
 665
 666 static void
 667 get_window_size( struct gl_framebuffer *fb, GLsizei *w, GLsizei *h )
 668 {
 669     __DRIdrawable *dPriv = swrast_drawable(fb)->dPriv;
 670     __DRIscreen *sPriv = dPriv->driScreenPriv;
 671     int x, y;
 672
 673     sPriv->swrast_loader->getDrawableInfo(dPriv,
 674                                           &x, &y, w, h,
 675                                           dPriv->loaderPrivate);
 676 }
 677
 678 static void
 679 swrast_check_and_update_window_size( struct gl_context *ctx, struct gl_framebuffer *fb )
 680 {
 681     GLsizei width, height;
 682
 683     if (!fb || fb == _mesa_get_incomplete_framebuffer())
 684         return;
 685
 686     get_window_size(fb, &width, &height);
 687     if (fb->Width != width || fb->Height != height) {
 688         _mesa_resize_framebuffer(ctx, fb, width, height);
 689     }
 690 }
 691
 692 static const GLubyte *
 693 get_string(struct gl_context *ctx, GLenum pname)
 694 {
 695     (void) ctx;
 696     switch (pname) {
 697         case GL_VENDOR:
 698             return (const GLubyte *) swrast_vendor_string;
 699         case GL_RENDERER:
 700             return (const GLubyte *) swrast_renderer_string;
 701         default:
 702             return NULL;
 703     }
 704 }
 705
 706 static void
 707 update_state(struct gl_context *ctx)
 708 {
 709     GLuint new_state = ctx->NewState;
 710
 711     if (new_state & (_NEW_SCISSOR | _NEW_BUFFERS | _NEW_VIEWPORT))
 712       _mesa_update_draw_buffer_bounds(ctx, ctx->DrawBuffer);
 713
 714     /* not much to do here - pass it on */
 715     _swrast_InvalidateState( ctx, new_state );
 716     _swsetup_InvalidateState( ctx, new_state );
 717     _tnl_InvalidateState( ctx, new_state );
 718 }
 719
 720 static void
 721 viewport(struct gl_context *ctx)
 722 {
 723     struct gl_framebuffer *draw = ctx->WinSysDrawBuffer;
 724     struct gl_framebuffer *read = ctx->WinSysReadBuffer;
 725
 726     swrast_check_and_update_window_size(ctx, draw);
 727     swrast_check_and_update_window_size(ctx, read);
 728 }
 729
 730 static mesa_format swrastChooseTextureFormat(struct gl_context * ctx,
 731                                            GLenum target,
 732                                            GLint internalFormat,
 733                                            GLenum format,
 734                                            GLenum type)
 735 {
 736     if (internalFormat == GL_RGB)
 737         return MESA_FORMAT_B8G8R8X8_UNORM;
 738     return _mesa_choose_tex_format(ctx, target, internalFormat, format, type);
 739 }
 740
 741 static void
 742 swrast_init_driver_functions(struct dd_function_table *driver)
 743 {
 744     driver->GetString = get_string;
 745     driver->UpdateState = update_state;
 746     driver->Viewport = viewport;
 747     driver->ChooseTextureFormat = swrastChooseTextureFormat;
 748     driver->MapRenderbuffer = swrast_map_renderbuffer;
 749     driver->UnmapRenderbuffer = swrast_unmap_renderbuffer;
 750 }
 751
 752 /**
 753  * Context-related functions.
 754  */
 755
 756 static GLboolean
 757 dri_create_context(gl_api api,
 758                    const struct gl_config * visual,
 759                    __DRIcontext * cPriv,
 760                    const struct __DriverContextConfig *ctx_config,
 761                    unsigned *error,
 762                    void *sharedContextPrivate)
 763 {
 764     struct dri_context *ctx = NULL;
 765     struct dri_context *share = (struct dri_context *)sharedContextPrivate;
 766     struct gl_context *mesaCtx = NULL;
 767     struct gl_context *sharedCtx = NULL;
 768     struct dd_function_table functions;
 769
 770     TRACE;
 771
 772     /* Flag filtering is handled in dri2CreateContextAttribs.
 773      */
 774     (void) ctx_config->flags;
 775
 776     /* The swrast driver doesn't understand any of the attributes */
 777     if (ctx_config->attribute_mask != 0) {
 778         *error = __DRI_CTX_ERROR_UNKNOWN_ATTRIBUTE;
 779         return false;
 780     }
 781
 782     ctx = CALLOC_STRUCT(dri_context);
 783     if (ctx == NULL) {
 784         *error = __DRI_CTX_ERROR_NO_MEMORY;
 785         goto context_fail;
 786     }
 787
 788     cPriv->driverPrivate = ctx;
 789     ctx->cPriv = cPriv;
 790
 791     /* build table of device driver functions */
 792     _mesa_init_driver_functions(&functions);
 793     swrast_init_driver_functions(&functions);
 794     _tnl_init_driver_draw_function(&functions);
 795
 796     if (share) {
 797         sharedCtx = &share->Base;
 798     }
 799
 800     mesaCtx = &ctx->Base;
 801
 802     /* basic context setup */
 803     if (!_mesa_initialize_context(mesaCtx, api, visual, sharedCtx, &functions)) {
 804         *error = __DRI_CTX_ERROR_NO_MEMORY;
 805         goto context_fail;
 806     }
 807
 808     driContextSetFlags(mesaCtx, ctx_config->flags);
 809
 810     /* create module contexts */
 811     _swrast_CreateContext( mesaCtx );
 812     _vbo_CreateContext( mesaCtx, false );
 813     _tnl_CreateContext( mesaCtx );
 814     _swsetup_CreateContext( mesaCtx );
 815     _swsetup_Wakeup( mesaCtx );
 816
 817     /* use default TCL pipeline */
 818     {
 819        TNLcontext *tnl = TNL_CONTEXT(mesaCtx);
 820        tnl->Driver.RunPipeline = _tnl_run_pipeline;
 821     }
 822
 823     _mesa_meta_init(mesaCtx);
 824     _mesa_enable_sw_extensions(mesaCtx);
 825
 826    _mesa_override_extensions(mesaCtx);
 827     _mesa_compute_version(mesaCtx);
 828
 829     _mesa_initialize_dispatch_tables(mesaCtx);
 830     _mesa_initialize_vbo_vtxfmt(mesaCtx);
 831
 832     *error = __DRI_CTX_ERROR_SUCCESS;
 833     return GL_TRUE;
 834
 835 context_fail:
 836
 837     free(ctx);
 838
 839     return GL_FALSE;
 840 }
 841
 842 static void
 843 dri_destroy_context(__DRIcontext * cPriv)
 844 {
 845     TRACE;
 846
 847     if (cPriv) {
 848         struct dri_context *ctx = dri_context(cPriv);
 849         struct gl_context *mesaCtx;
 850
 851         mesaCtx = &ctx->Base;
 852
 853         _mesa_meta_free(mesaCtx);
 854         _swsetup_DestroyContext( mesaCtx );
 855         _swrast_DestroyContext( mesaCtx );
 856         _tnl_DestroyContext( mesaCtx );
 857         _vbo_DestroyContext( mesaCtx );
 858         _mesa_destroy_context( mesaCtx );
 859     }
 860 }
 861
 862 static GLboolean
 863 dri_make_current(__DRIcontext * cPriv,
 864                  __DRIdrawable * driDrawPriv,
 865                  __DRIdrawable * driReadPriv)
 866 {
 867     struct gl_context *mesaCtx;
 868     struct gl_framebuffer *mesaDraw = NULL;
 869     struct gl_framebuffer *mesaRead = NULL;
 870     TRACE;
 871
 872     if (cPriv) {
 873         mesaCtx = &dri_context(cPriv)->Base;
 874
 875         if (driDrawPriv && driReadPriv) {
 876            struct dri_drawable *draw = dri_drawable(driDrawPriv);
 877            struct dri_drawable *read = dri_drawable(driReadPriv);
 878            mesaDraw = &draw->Base;
 879            mesaRead = &read->Base;
 880         }
 881         else {
 882            struct gl_framebuffer *incomplete
 883               = _mesa_get_incomplete_framebuffer();
 884            mesaDraw = incomplete;
 885            mesaRead = incomplete;
 886         }
 887
 888         /* check for same context and buffer */
 889         if (mesaCtx == _mesa_get_current_context()
 890             && mesaCtx->DrawBuffer == mesaDraw
 891             && mesaCtx->ReadBuffer == mesaRead) {
 892             return GL_TRUE;
 893         }
 894
 895         swrast_check_and_update_window_size(mesaCtx, mesaDraw);
 896         if (mesaRead != mesaDraw)
 897             swrast_check_and_update_window_size(mesaCtx, mesaRead);
 898
 899         _mesa_make_current( mesaCtx,
 900                             mesaDraw,
 901                             mesaRead );
 902     }
 903     else {
 904         /* unbind */
 905         _mesa_make_current( NULL, NULL, NULL );
 906     }
 907
 908     return GL_TRUE;
 909 }
 910
 911 static GLboolean
 912 dri_unbind_context(__DRIcontext * cPriv)
 913 {
 914     TRACE;
 915     (void) cPriv;
 916
 917     /* Unset current context and dispath table */
 918     _mesa_make_current(NULL, NULL, NULL);
 919
 920     return GL_TRUE;
 921 }
 922
 923 static void
 924 dri_copy_sub_buffer(__DRIdrawable *dPriv, int x, int y,
 925                     int w, int h)
 926 {
 927     __DRIscreen *sPriv = dPriv->driScreenPriv;
 928     void *data;
 929     int iy;
 930     struct dri_drawable *drawable = dri_drawable(dPriv);
 931     struct gl_framebuffer *fb;
 932     struct dri_swrast_renderbuffer *frontrb, *backrb;
 933
 934     TRACE;
 935
 936     fb = &drawable->Base;
 937
 938     frontrb =
 939         dri_swrast_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 940     backrb =
 941         dri_swrast_renderbuffer(fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
 942
 943     /* check for signle-buffered */
 944     if (backrb == NULL)
 945        return;
 946
 947     iy = frontrb->Base.Base.Height - y - h;
 948     data = (char *)backrb->Base.Buffer + (iy * backrb->pitch) + (x * ((backrb->bpp + 7) / 8));
 949     sPriv->swrast_loader->putImage2(dPriv, __DRI_SWRAST_IMAGE_OP_SWAP,
 950                                     x, iy, w, h,
 951                                     frontrb->pitch,
 952                                     data,
 953                                     dPriv->loaderPrivate);
 954 }
 955
 956
 957 static const struct __DriverAPIRec swrast_driver_api = {
 958     .InitScreen = dri_init_screen,
 959     .DestroyScreen = dri_destroy_screen,
 960     .CreateContext = dri_create_context,
 961     .DestroyContext = dri_destroy_context,
 962     .CreateBuffer = dri_create_buffer,
 963     .DestroyBuffer = dri_destroy_buffer,
 964     .SwapBuffers = dri_swap_buffers,
 965     .MakeCurrent = dri_make_current,
 966     .UnbindContext = dri_unbind_context,
 967     .CopySubBuffer = dri_copy_sub_buffer,
 968 };
 969
 970 static const struct __DRIDriverVtableExtensionRec swrast_vtable = {
 971    .base = { __DRI_DRIVER_VTABLE, 1 },
 972    .vtable = &swrast_driver_api,
 973 };
 974
 975 static const __DRIextension *swrast_driver_extensions[] = {
 976     &driCoreExtension.base,
 977     &driSWRastExtension.base,
 978     &driCopySubBufferExtension.base,
 979     &swrast_vtable.base,
 980     NULL
 981 };
 982
 983 PUBLIC const __DRIextension **__driDriverGetExtensions_swrast(void)
 984 {
 985    globalDriverAPI = &swrast_driver_api;
 986
 987    return swrast_driver_extensions;
 988 }