src/mesa/state_tracker/st_manager.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.9
   4  *
   5  * Copyright (C) 2010 LunarG Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Chia-I Wu <olv@lunarg.com>
  27  */
  28
  29 #include "state_tracker/st_gl_api.h"
  30
  31 #include "pipe/p_context.h"
  32 #include "pipe/p_screen.h"
  33 #include "util/u_format.h"
  34 #include "util/u_pointer.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_atomic.h"
  37 #include "util/u_surface.h"
  38
  39 #include "main/mtypes.h"
  40 #include "main/context.h"
  41 #include "main/mfeatures.h"
  42 #include "main/texobj.h"
  43 #include "main/teximage.h"
  44 #include "main/texstate.h"
  45 #include "main/framebuffer.h"
  46 #include "main/fbobject.h"
  47 #include "main/renderbuffer.h"
  48 #include "main/version.h"
  49 #include "st_texture.h"
  50
  51 #include "st_context.h"
  52 #include "st_format.h"
  53 #include "st_cb_fbo.h"
  54 #include "st_cb_flush.h"
  55 #include "st_manager.h"
  56
  57 /**
  58  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  59  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  60  * We'll only return non-null for window system framebuffers.
  61  * Note that this function may fail.
  62  */
  63 static INLINE struct st_framebuffer *
  64 st_ws_framebuffer(struct gl_framebuffer *fb)
  65 {
  66    /* FBO cannot be casted.  See st_new_framebuffer */
  67    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  68 }
  69
  70 /**
  71  * Map an attachment to a buffer index.
  72  */
  73 static INLINE gl_buffer_index
  74 attachment_to_buffer_index(enum st_attachment_type statt)
  75 {
  76    gl_buffer_index index;
  77
  78    switch (statt) {
  79    case ST_ATTACHMENT_FRONT_LEFT:
  80       index = BUFFER_FRONT_LEFT;
  81       break;
  82    case ST_ATTACHMENT_BACK_LEFT:
  83       index = BUFFER_BACK_LEFT;
  84       break;
  85    case ST_ATTACHMENT_FRONT_RIGHT:
  86       index = BUFFER_FRONT_RIGHT;
  87       break;
  88    case ST_ATTACHMENT_BACK_RIGHT:
  89       index = BUFFER_BACK_RIGHT;
  90       break;
  91    case ST_ATTACHMENT_DEPTH_STENCIL:
  92       index = BUFFER_DEPTH;
  93       break;
  94    case ST_ATTACHMENT_ACCUM:
  95       index = BUFFER_ACCUM;
  96       break;
  97    case ST_ATTACHMENT_SAMPLE:
  98    default:
  99       index = BUFFER_COUNT;
 100       break;
 101    }
 102
 103    return index;
 104 }
 105
 106 /**
 107  * Map a buffer index to an attachment.
 108  */
 109 static INLINE enum st_attachment_type
 110 buffer_index_to_attachment(gl_buffer_index index)
 111 {
 112    enum st_attachment_type statt;
 113
 114    switch (index) {
 115    case BUFFER_FRONT_LEFT:
 116       statt = ST_ATTACHMENT_FRONT_LEFT;
 117       break;
 118    case BUFFER_BACK_LEFT:
 119       statt = ST_ATTACHMENT_BACK_LEFT;
 120       break;
 121    case BUFFER_FRONT_RIGHT:
 122       statt = ST_ATTACHMENT_FRONT_RIGHT;
 123       break;
 124    case BUFFER_BACK_RIGHT:
 125       statt = ST_ATTACHMENT_BACK_RIGHT;
 126       break;
 127    case BUFFER_DEPTH:
 128       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 129       break;
 130    case BUFFER_ACCUM:
 131       statt = ST_ATTACHMENT_ACCUM;
 132       break;
 133    default:
 134       statt = ST_ATTACHMENT_INVALID;
 135       break;
 136    }
 137
 138    return statt;
 139 }
 140
 141 /**
 142  * Make sure a context picks up the latest cached state of the
 143  * drawables it binds to.
 144  */
 145 static void
 146 st_context_validate(struct st_context *st,
 147                     struct st_framebuffer *stdraw,
 148                     struct st_framebuffer *stread)
 149 {
 150     if (stdraw && stdraw->stamp != st->draw_stamp) {
 151        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 152        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 153                                 stdraw->Base.Width,
 154                                 stdraw->Base.Height);
 155        st->draw_stamp = stdraw->stamp;
 156     }
 157
 158     if (stread && stread->stamp != st->read_stamp) {
 159        if (stread != stdraw) {
 160           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 161           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 162                                    stread->Base.Width,
 163                                    stread->Base.Height);
 164        }
 165        st->read_stamp = stread->stamp;
 166     }
 167 }
 168
 169 /**
 170  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 171  * The context we need to pass in is s dummy context needed only to be
 172  * able to get a pipe context to create pipe surfaces, and to have a
 173  * context to call _mesa_resize_framebuffer():
 174  * (That should probably be rethought, since those surfaces become
 175  * drawable state, not context state, and can be freed by another pipe
 176  * context).
 177  */
 178 static void
 179 st_framebuffer_validate(struct st_framebuffer *stfb,
 180                         struct st_context *st)
 181 {
 182    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 183    uint width, height;
 184    unsigned i;
 185    boolean changed = FALSE;
 186    int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);
 187
 188    if (stfb->iface_stamp == new_stamp)
 189       return;
 190
 191    /* validate the fb */
 192    do {
 193       if (!stfb->iface->validate(stfb->iface, stfb->statts,
 194                                  stfb->num_statts, textures))
 195          return;
 196
 197       stfb->iface_stamp = new_stamp;
 198       new_stamp = p_atomic_read(&stfb->iface->stamp);
 199    } while(stfb->iface_stamp != new_stamp);
 200
 201    width = stfb->Base.Width;
 202    height = stfb->Base.Height;
 203
 204    for (i = 0; i < stfb->num_statts; i++) {
 205       struct st_renderbuffer *strb;
 206       struct pipe_surface *ps, surf_tmpl;
 207       gl_buffer_index idx;
 208
 209       if (!textures[i])
 210          continue;
 211
 212       idx = attachment_to_buffer_index(stfb->statts[i]);
 213       if (idx >= BUFFER_COUNT) {
 214          pipe_resource_reference(&textures[i], NULL);
 215          continue;
 216       }
 217
 218       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 219       assert(strb);
 220       if (strb->texture == textures[i]) {
 221          pipe_resource_reference(&textures[i], NULL);
 222          continue;
 223       }
 224
 225       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 226       u_surface_default_template(&surf_tmpl, textures[i],
 227                                  PIPE_BIND_RENDER_TARGET);
 228       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 229       if (ps) {
 230          pipe_surface_reference(&strb->surface, ps);
 231          pipe_resource_reference(&strb->texture, ps->texture);
 232          /* ownership transfered */
 233          pipe_surface_reference(&ps, NULL);
 234
 235          changed = TRUE;
 236
 237          strb->Base.Width = strb->surface->width;
 238          strb->Base.Height = strb->surface->height;
 239
 240          width = strb->Base.Width;
 241          height = strb->Base.Height;
 242       }
 243
 244       pipe_resource_reference(&textures[i], NULL);
 245    }
 246
 247    if (changed) {
 248       ++stfb->stamp;
 249       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 250    }
 251 }
 252
 253 /**
 254  * Update the attachments to validate by looping the existing renderbuffers.
 255  */
 256 static void
 257 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 258 {
 259    gl_buffer_index idx;
 260
 261    stfb->num_statts = 0;
 262    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 263       struct st_renderbuffer *strb;
 264       enum st_attachment_type statt;
 265
 266       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 267       if (!strb || strb->software)
 268          continue;
 269
 270       statt = buffer_index_to_attachment(idx);
 271       if (statt != ST_ATTACHMENT_INVALID &&
 272           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 273          stfb->statts[stfb->num_statts++] = statt;
 274    }
 275    stfb->stamp++;
 276 }
 277
 278 /**
 279  * Add a renderbuffer to the framebuffer.
 280  */
 281 static boolean
 282 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 283                                 gl_buffer_index idx)
 284 {
 285    struct gl_renderbuffer *rb;
 286    enum pipe_format format;
 287    int samples;
 288    boolean sw;
 289
 290    if (!stfb->iface)
 291       return FALSE;
 292
 293    /* do not distinguish depth/stencil buffers */
 294    if (idx == BUFFER_STENCIL)
 295       idx = BUFFER_DEPTH;
 296
 297    switch (idx) {
 298    case BUFFER_DEPTH:
 299       format = stfb->iface->visual->depth_stencil_format;
 300       sw = FALSE;
 301       break;
 302    case BUFFER_ACCUM:
 303       format = stfb->iface->visual->accum_format;
 304       sw = TRUE;
 305       break;
 306    default:
 307       format = stfb->iface->visual->color_format;
 308       sw = FALSE;
 309       break;
 310    }
 311
 312    if (format == PIPE_FORMAT_NONE)
 313       return FALSE;
 314
 315    samples = stfb->iface->visual->samples;
 316    if (!samples)
 317       samples = st_get_msaa();
 318
 319    rb = st_new_renderbuffer_fb(format, samples, sw);
 320    if (!rb)
 321       return FALSE;
 322
 323    if (idx != BUFFER_DEPTH) {
 324       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 325    }
 326    else {
 327       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 328          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 329       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 330          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 331    }
 332
 333    return TRUE;
 334 }
 335
 336 /**
 337  * Intialize a struct gl_config from a visual.
 338  */
 339 static void
 340 st_visual_to_context_mode(const struct st_visual *visual,
 341                           struct gl_config *mode)
 342 {
 343    memset(mode, 0, sizeof(*mode));
 344
 345    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 346       mode->doubleBufferMode = GL_TRUE;
 347    if (st_visual_have_buffers(visual,
 348             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 349       mode->stereoMode = GL_TRUE;
 350
 351    if (visual->color_format != PIPE_FORMAT_NONE) {
 352       mode->rgbMode = GL_TRUE;
 353
 354       mode->redBits =
 355          util_format_get_component_bits(visual->color_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 0);
 357       mode->greenBits =
 358          util_format_get_component_bits(visual->color_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 1);
 360       mode->blueBits =
 361          util_format_get_component_bits(visual->color_format,
 362                UTIL_FORMAT_COLORSPACE_RGB, 2);
 363       mode->alphaBits =
 364          util_format_get_component_bits(visual->color_format,
 365                UTIL_FORMAT_COLORSPACE_RGB, 3);
 366
 367       mode->rgbBits = mode->redBits +
 368          mode->greenBits + mode->blueBits + mode->alphaBits;
 369    }
 370
 371    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 372       mode->depthBits =
 373          util_format_get_component_bits(visual->depth_stencil_format,
 374                UTIL_FORMAT_COLORSPACE_ZS, 0);
 375       mode->stencilBits =
 376          util_format_get_component_bits(visual->depth_stencil_format,
 377                UTIL_FORMAT_COLORSPACE_ZS, 1);
 378
 379       mode->haveDepthBuffer = mode->depthBits > 0;
 380       mode->haveStencilBuffer = mode->stencilBits > 0;
 381    }
 382
 383    if (visual->accum_format != PIPE_FORMAT_NONE) {
 384       mode->haveAccumBuffer = GL_TRUE;
 385
 386       mode->accumRedBits =
 387          util_format_get_component_bits(visual->accum_format,
 388                UTIL_FORMAT_COLORSPACE_RGB, 0);
 389       mode->accumGreenBits =
 390          util_format_get_component_bits(visual->accum_format,
 391                UTIL_FORMAT_COLORSPACE_RGB, 1);
 392       mode->accumBlueBits =
 393          util_format_get_component_bits(visual->accum_format,
 394                UTIL_FORMAT_COLORSPACE_RGB, 2);
 395       mode->accumAlphaBits =
 396          util_format_get_component_bits(visual->accum_format,
 397                UTIL_FORMAT_COLORSPACE_RGB, 3);
 398    }
 399
 400    if (visual->samples) {
 401       mode->sampleBuffers = 1;
 402       mode->samples = visual->samples;
 403    }
 404 }
 405
 406 /**
 407  * Create a framebuffer from a manager interface.
 408  */
 409 static struct st_framebuffer *
 410 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 411 {
 412    struct st_framebuffer *stfb;
 413    struct gl_config mode;
 414    gl_buffer_index idx;
 415
 416    if (!stfbi)
 417       return NULL;
 418
 419    stfb = CALLOC_STRUCT(st_framebuffer);
 420    if (!stfb)
 421       return NULL;
 422
 423    st_visual_to_context_mode(stfbi->visual, &mode);
 424    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 425
 426    stfb->iface = stfbi;
 427    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 428
 429    /* add the color buffer */
 430    idx = stfb->Base._ColorDrawBufferIndexes[0];
 431    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 432       FREE(stfb);
 433       return NULL;
 434    }
 435
 436    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 437    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 438
 439    stfb->stamp = 0;
 440    st_framebuffer_update_attachments(stfb);
 441
 442    stfb->Base.Initialized = GL_TRUE;
 443
 444    return stfb;
 445 }
 446
 447 /**
 448  * Reference a framebuffer.
 449  */
 450 static void
 451 st_framebuffer_reference(struct st_framebuffer **ptr,
 452                          struct st_framebuffer *stfb)
 453 {
 454    struct gl_framebuffer *fb = &stfb->Base;
 455    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 456 }
 457
 458 static void
 459 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 460                  struct pipe_fence_handle **fence)
 461 {
 462    struct st_context *st = (struct st_context *) stctxi;
 463    st_flush(st, fence);
 464    if (flags & ST_FLUSH_FRONT)
 465       st_manager_flush_frontbuffer(st);
 466 }
 467
 468 static boolean
 469 st_context_teximage(struct st_context_iface *stctxi,
 470                     enum st_texture_type target,
 471                     int level, enum pipe_format internal_format,
 472                     struct pipe_resource *tex, boolean mipmap)
 473 {
 474    struct st_context *st = (struct st_context *) stctxi;
 475    struct gl_context *ctx = st->ctx;
 476    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 477    struct gl_texture_object *texObj;
 478    struct gl_texture_image *texImage;
 479    struct st_texture_object *stObj;
 480    struct st_texture_image *stImage;
 481    GLenum internalFormat;
 482    GLuint width, height, depth;
 483
 484    switch (target) {
 485    case ST_TEXTURE_1D:
 486       target = GL_TEXTURE_1D;
 487       break;
 488    case ST_TEXTURE_2D:
 489       target = GL_TEXTURE_2D;
 490       break;
 491    case ST_TEXTURE_3D:
 492       target = GL_TEXTURE_3D;
 493       break;
 494    case ST_TEXTURE_RECT:
 495       target = GL_TEXTURE_RECTANGLE_ARB;
 496       break;
 497    default:
 498       return FALSE;
 499       break;
 500    }
 501
 502    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 503    _mesa_lock_texture(ctx, texObj);
 504
 505    stObj = st_texture_object(texObj);
 506    /* switch to surface based */
 507    if (!stObj->surface_based) {
 508       _mesa_clear_texture_object(ctx, texObj);
 509       stObj->surface_based = GL_TRUE;
 510    }
 511
 512    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 513    stImage = st_texture_image(texImage);
 514    if (tex) {
 515       gl_format texFormat;
 516
 517       /*
 518        * XXX When internal_format and tex->format differ, st_finalize_texture
 519        * needs to allocate a new texture with internal_format and copy the
 520        * texture here into the new one.  It will result in surface_copy being
 521        * called on surfaces whose formats differ.
 522        *
 523        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 524        * is to use a sampler view.
 525        */
 526       if (!st_sampler_compat_formats(tex->format, internal_format))
 527          internal_format = tex->format;
 528
 529       if (util_format_get_component_bits(internal_format,
 530                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 531          internalFormat = GL_RGBA;
 532       else
 533          internalFormat = GL_RGB;
 534
 535       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 536                                          GL_BGRA, GL_UNSIGNED_BYTE);
 537
 538       _mesa_init_teximage_fields(ctx, target, texImage,
 539                                  tex->width0, tex->height0, 1, 0,
 540                                  internalFormat, texFormat);
 541
 542       width = tex->width0;
 543       height = tex->height0;
 544       depth = tex->depth0;
 545
 546       /* grow the image size until we hit level = 0 */
 547       while (level > 0) {
 548          if (width != 1)
 549             width <<= 1;
 550          if (height != 1)
 551             height <<= 1;
 552          if (depth != 1)
 553             depth <<= 1;
 554          level--;
 555       }
 556    }
 557    else {
 558       _mesa_clear_texture_image(ctx, texImage);
 559       width = height = depth = 0;
 560    }
 561
 562    pipe_resource_reference(&stImage->pt, tex);
 563    stObj->width0 = width;
 564    stObj->height0 = height;
 565    stObj->depth0 = depth;
 566
 567    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 568    _mesa_unlock_texture(ctx, texObj);
 569
 570    return TRUE;
 571 }
 572
 573 static void
 574 st_context_copy(struct st_context_iface *stctxi,
 575                 struct st_context_iface *stsrci, unsigned mask)
 576 {
 577    struct st_context *st = (struct st_context *) stctxi;
 578    struct st_context *src = (struct st_context *) stsrci;
 579
 580    _mesa_copy_context(src->ctx, st->ctx, mask);
 581 }
 582
 583 static boolean
 584 st_context_share(struct st_context_iface *stctxi,
 585                  struct st_context_iface *stsrci)
 586 {
 587    struct st_context *st = (struct st_context *) stctxi;
 588    struct st_context *src = (struct st_context *) stsrci;
 589
 590    return _mesa_share_state(st->ctx, src->ctx);
 591 }
 592
 593 static void
 594 st_context_destroy(struct st_context_iface *stctxi)
 595 {
 596    struct st_context *st = (struct st_context *) stctxi;
 597    st_destroy_context(st);
 598 }
 599
 600 static struct st_context_iface *
 601 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 602                       const struct st_context_attribs *attribs,
 603                       enum st_context_error *error,
 604                       struct st_context_iface *shared_stctxi)
 605 {
 606    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 607    struct st_context *st;
 608    struct pipe_context *pipe;
 609    struct gl_config mode;
 610    gl_api api;
 611
 612    if (!(stapi->profile_mask & (1 << attribs->profile)))
 613       return NULL;
 614
 615    switch (attribs->profile) {
 616    case ST_PROFILE_DEFAULT:
 617       api = API_OPENGL;
 618       break;
 619    case ST_PROFILE_OPENGL_ES1:
 620       api = API_OPENGLES;
 621       break;
 622    case ST_PROFILE_OPENGL_ES2:
 623       api = API_OPENGLES2;
 624       break;
 625    case ST_PROFILE_OPENGL_CORE:
 626    default:
 627       *error = ST_CONTEXT_ERROR_BAD_API;
 628       return NULL;
 629       break;
 630    }
 631
 632    pipe = smapi->screen->context_create(smapi->screen, NULL);
 633    if (!pipe) {
 634       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 635       return NULL;
 636    }
 637
 638    st_visual_to_context_mode(&attribs->visual, &mode);
 639    st = st_create_context(api, pipe, &mode, shared_ctx);
 640    if (!st) {
 641       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 642       pipe->destroy(pipe);
 643       return NULL;
 644    }
 645
 646    /* need to perform version check */
 647    if (attribs->major > 1 || attribs->minor > 0) {
 648       _mesa_compute_version(st->ctx);
 649
 650       /* is the actual version less than the requested version? */
 651       if (st->ctx->VersionMajor * 10 + st->ctx->VersionMinor <
 652           attribs->major * 10 + attribs->minor) {
 653          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 654          st_destroy_context(st);
 655          return NULL;
 656       }
 657    }
 658
 659    st->invalidate_on_gl_viewport =
 660       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 661
 662    st->iface.destroy = st_context_destroy;
 663    st->iface.flush = st_context_flush;
 664    st->iface.teximage = st_context_teximage;
 665    st->iface.copy = st_context_copy;
 666    st->iface.share = st_context_share;
 667    st->iface.st_context_private = (void *) smapi;
 668
 669    *error = ST_CONTEXT_SUCCESS;
 670    return &st->iface;
 671 }
 672
 673 static struct st_context_iface *
 674 st_api_get_current(struct st_api *stapi)
 675 {
 676    GET_CURRENT_CONTEXT(ctx);
 677    struct st_context *st = (ctx) ? ctx->st : NULL;
 678
 679    return (st) ? &st->iface : NULL;
 680 }
 681
 682 static struct st_framebuffer *
 683 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 684                                struct st_framebuffer_iface *stfbi)
 685 {
 686    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 687
 688    if (cur && cur->iface == stfbi) {
 689       /* reuse the current stfb */
 690       st_framebuffer_reference(&stfb, cur);
 691    }
 692    else {
 693       /* create a new one */
 694       stfb = st_framebuffer_create(stfbi);
 695    }
 696
 697    return stfb;
 698 }
 699
 700 static boolean
 701 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 702                     struct st_framebuffer_iface *stdrawi,
 703                     struct st_framebuffer_iface *streadi)
 704 {
 705    struct st_context *st = (struct st_context *) stctxi;
 706    struct st_framebuffer *stdraw, *stread;
 707    boolean ret;
 708
 709    _glapi_check_multithread();
 710
 711    if (st) {
 712       /* reuse or create the draw fb */
 713       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 714                                               stdrawi);
 715       if (streadi != stdrawi) {
 716          /* do the same for the read fb */
 717          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 718                                                  streadi);
 719       }
 720       else {
 721          stread = NULL;
 722          /* reuse the draw fb for the read fb */
 723          if (stdraw)
 724             st_framebuffer_reference(&stread, stdraw);
 725       }
 726
 727       if (stdraw && stread) {
 728          st_framebuffer_validate(stdraw, st);
 729          if (stread != stdraw)
 730             st_framebuffer_validate(stread, st);
 731
 732          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 733
 734          st->draw_stamp = stdraw->stamp - 1;
 735          st->read_stamp = stread->stamp - 1;
 736          st_context_validate(st, stdraw, stread);
 737       }
 738       else {
 739          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 740          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 741       }
 742
 743       st_framebuffer_reference(&stdraw, NULL);
 744       st_framebuffer_reference(&stread, NULL);
 745    }
 746    else {
 747       ret = _mesa_make_current(NULL, NULL, NULL);
 748    }
 749
 750    return ret;
 751 }
 752
 753 static st_proc_t
 754 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 755 {
 756    return (st_proc_t) _glapi_get_proc_address(procname);
 757 }
 758
 759 static void
 760 st_api_destroy(struct st_api *stapi)
 761 {
 762 }
 763
 764 /**
 765  * Flush the front buffer if the current context renders to the front buffer.
 766  */
 767 void
 768 st_manager_flush_frontbuffer(struct st_context *st)
 769 {
 770    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 771    struct st_renderbuffer *strb = NULL;
 772
 773    if (stfb)
 774       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 775    if (!strb)
 776       return;
 777
 778    /* never a dummy fb */
 779    assert(stfb->iface);
 780    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 781 }
 782
 783 /**
 784  * Return the surface of an EGLImage.
 785  * FIXME: I think this should operate on resources, not surfaces
 786  */
 787 struct pipe_surface *
 788 st_manager_get_egl_image_surface(struct st_context *st,
 789                                  void *eglimg, unsigned usage)
 790 {
 791    struct st_manager *smapi =
 792       (struct st_manager *) st->iface.st_context_private;
 793    struct st_egl_image stimg;
 794    struct pipe_surface *ps, surf_tmpl;
 795
 796    if (!smapi || !smapi->get_egl_image)
 797       return NULL;
 798
 799    memset(&stimg, 0, sizeof(stimg));
 800    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 801       return NULL;
 802
 803    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 804    surf_tmpl.format = stimg.texture->format;
 805    surf_tmpl.usage = usage;
 806    surf_tmpl.u.tex.level = stimg.level;
 807    surf_tmpl.u.tex.first_layer = stimg.layer;
 808    surf_tmpl.u.tex.last_layer = stimg.layer;
 809    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 810    pipe_resource_reference(&stimg.texture, NULL);
 811
 812    return ps;
 813 }
 814
 815 /**
 816  * Re-validate the framebuffers.
 817  */
 818 void
 819 st_manager_validate_framebuffers(struct st_context *st)
 820 {
 821    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 822    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 823
 824    if (stdraw)
 825       st_framebuffer_validate(stdraw, st);
 826    if (stread && stread != stdraw)
 827       st_framebuffer_validate(stread, st);
 828
 829    st_context_validate(st, stdraw, stread);
 830 }
 831
 832 /**
 833  * Add a color renderbuffer on demand.
 834  */
 835 boolean
 836 st_manager_add_color_renderbuffer(struct st_context *st,
 837                                   struct gl_framebuffer *fb,
 838                                   gl_buffer_index idx)
 839 {
 840    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 841
 842    /* FBO */
 843    if (!stfb)
 844       return FALSE;
 845
 846    if (stfb->Base.Attachment[idx].Renderbuffer)
 847       return TRUE;
 848
 849    switch (idx) {
 850    case BUFFER_FRONT_LEFT:
 851    case BUFFER_BACK_LEFT:
 852    case BUFFER_FRONT_RIGHT:
 853    case BUFFER_BACK_RIGHT:
 854       break;
 855    default:
 856       return FALSE;
 857       break;
 858    }
 859
 860    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 861       return FALSE;
 862
 863    st_framebuffer_update_attachments(stfb);
 864
 865    /*
 866     * Force a call to the state tracker manager to validate the
 867     * new renderbuffer. It might be that there is a window system
 868     * renderbuffer available.
 869     */
 870    if(stfb->iface)
 871       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 872
 873    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 874
 875    return TRUE;
 876 }
 877
 878 static const struct st_api st_gl_api = {
 879    "Mesa " MESA_VERSION_STRING,
 880    ST_API_OPENGL,
 881 #if FEATURE_GL
 882    ST_PROFILE_DEFAULT_MASK |
 883 #endif
 884 #if FEATURE_ES1
 885    ST_PROFILE_OPENGL_ES1_MASK |
 886 #endif
 887 #if FEATURE_ES2
 888    ST_PROFILE_OPENGL_ES2_MASK |
 889 #endif
 890    0,
 891    st_api_destroy,
 892    st_api_get_proc_address,
 893    st_api_create_context,
 894    st_api_make_current,
 895    st_api_get_current,
 896 };
 897
 898 struct st_api *
 899 st_gl_api_create(void)
 900 {
 901    return (struct st_api *) &st_gl_api;
 902 }