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