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 "main/mtypes.h"
  30 #include "main/context.h"
  31 #include "main/mfeatures.h"
  32 #include "main/texobj.h"
  33 #include "main/teximage.h"
  34 #include "main/texstate.h"
  35 #include "main/framebuffer.h"
  36 #include "main/fbobject.h"
  37 #include "main/renderbuffer.h"
  38 #include "main/version.h"
  39 #include "st_texture.h"
  40
  41 #include "st_context.h"
  42 #include "st_format.h"
  43 #include "st_cb_fbo.h"
  44 #include "st_cb_flush.h"
  45 #include "st_manager.h"
  46
  47 #include "state_tracker/st_gl_api.h"
  48
  49 #include "pipe/p_context.h"
  50 #include "pipe/p_screen.h"
  51 #include "util/u_format.h"
  52 #include "util/u_pointer.h"
  53 #include "util/u_inlines.h"
  54 #include "util/u_atomic.h"
  55 #include "util/u_surface.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       u_surface_default_template(&surf_tmpl, textures[i],
 226                                  PIPE_BIND_RENDER_TARGET);
 227       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 228       if (ps) {
 229          pipe_surface_reference(&strb->surface, ps);
 230          pipe_resource_reference(&strb->texture, ps->texture);
 231          /* ownership transfered */
 232          pipe_surface_reference(&ps, NULL);
 233
 234          changed = TRUE;
 235
 236          strb->Base.Width = strb->surface->width;
 237          strb->Base.Height = strb->surface->height;
 238
 239          width = strb->Base.Width;
 240          height = strb->Base.Height;
 241       }
 242
 243       pipe_resource_reference(&textures[i], NULL);
 244    }
 245
 246    if (changed) {
 247       ++stfb->stamp;
 248       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 249    }
 250 }
 251
 252 /**
 253  * Update the attachments to validate by looping the existing renderbuffers.
 254  */
 255 static void
 256 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 257 {
 258    gl_buffer_index idx;
 259
 260    stfb->num_statts = 0;
 261    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 262       struct st_renderbuffer *strb;
 263       enum st_attachment_type statt;
 264
 265       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 266       if (!strb || strb->software)
 267          continue;
 268
 269       statt = buffer_index_to_attachment(idx);
 270       if (statt != ST_ATTACHMENT_INVALID &&
 271           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 272          stfb->statts[stfb->num_statts++] = statt;
 273    }
 274    stfb->stamp++;
 275 }
 276
 277 /**
 278  * Add a renderbuffer to the framebuffer.
 279  */
 280 static boolean
 281 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 282                                 gl_buffer_index idx)
 283 {
 284    struct gl_renderbuffer *rb;
 285    enum pipe_format format;
 286    int samples;
 287    boolean sw;
 288
 289    if (!stfb->iface)
 290       return FALSE;
 291
 292    /* do not distinguish depth/stencil buffers */
 293    if (idx == BUFFER_STENCIL)
 294       idx = BUFFER_DEPTH;
 295
 296    switch (idx) {
 297    case BUFFER_DEPTH:
 298       format = stfb->iface->visual->depth_stencil_format;
 299       sw = FALSE;
 300       break;
 301    case BUFFER_ACCUM:
 302       format = stfb->iface->visual->accum_format;
 303       sw = TRUE;
 304       break;
 305    default:
 306       format = stfb->iface->visual->color_format;
 307       sw = FALSE;
 308       break;
 309    }
 310
 311    if (format == PIPE_FORMAT_NONE)
 312       return FALSE;
 313
 314    samples = stfb->iface->visual->samples;
 315    if (!samples)
 316       samples = st_get_msaa();
 317
 318    rb = st_new_renderbuffer_fb(format, samples, sw);
 319    if (!rb)
 320       return FALSE;
 321
 322    if (idx != BUFFER_DEPTH) {
 323       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 324    }
 325    else {
 326       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 327          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 328       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 329          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 330    }
 331
 332    return TRUE;
 333 }
 334
 335 /**
 336  * Intialize a struct gl_config from a visual.
 337  */
 338 static void
 339 st_visual_to_context_mode(const struct st_visual *visual,
 340                           struct gl_config *mode)
 341 {
 342    memset(mode, 0, sizeof(*mode));
 343
 344    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 345       mode->doubleBufferMode = GL_TRUE;
 346    if (st_visual_have_buffers(visual,
 347             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 348       mode->stereoMode = GL_TRUE;
 349
 350    if (visual->color_format != PIPE_FORMAT_NONE) {
 351       mode->rgbMode = GL_TRUE;
 352
 353       mode->redBits =
 354          util_format_get_component_bits(visual->color_format,
 355                UTIL_FORMAT_COLORSPACE_RGB, 0);
 356       mode->greenBits =
 357          util_format_get_component_bits(visual->color_format,
 358                UTIL_FORMAT_COLORSPACE_RGB, 1);
 359       mode->blueBits =
 360          util_format_get_component_bits(visual->color_format,
 361                UTIL_FORMAT_COLORSPACE_RGB, 2);
 362       mode->alphaBits =
 363          util_format_get_component_bits(visual->color_format,
 364                UTIL_FORMAT_COLORSPACE_RGB, 3);
 365
 366       mode->rgbBits = mode->redBits +
 367          mode->greenBits + mode->blueBits + mode->alphaBits;
 368    }
 369
 370    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 371       mode->depthBits =
 372          util_format_get_component_bits(visual->depth_stencil_format,
 373                UTIL_FORMAT_COLORSPACE_ZS, 0);
 374       mode->stencilBits =
 375          util_format_get_component_bits(visual->depth_stencil_format,
 376                UTIL_FORMAT_COLORSPACE_ZS, 1);
 377
 378       mode->haveDepthBuffer = mode->depthBits > 0;
 379       mode->haveStencilBuffer = mode->stencilBits > 0;
 380    }
 381
 382    if (visual->accum_format != PIPE_FORMAT_NONE) {
 383       mode->haveAccumBuffer = GL_TRUE;
 384
 385       mode->accumRedBits =
 386          util_format_get_component_bits(visual->accum_format,
 387                UTIL_FORMAT_COLORSPACE_RGB, 0);
 388       mode->accumGreenBits =
 389          util_format_get_component_bits(visual->accum_format,
 390                UTIL_FORMAT_COLORSPACE_RGB, 1);
 391       mode->accumBlueBits =
 392          util_format_get_component_bits(visual->accum_format,
 393                UTIL_FORMAT_COLORSPACE_RGB, 2);
 394       mode->accumAlphaBits =
 395          util_format_get_component_bits(visual->accum_format,
 396                UTIL_FORMAT_COLORSPACE_RGB, 3);
 397    }
 398
 399    if (visual->samples) {
 400       mode->sampleBuffers = 1;
 401       mode->samples = visual->samples;
 402    }
 403 }
 404
 405 /**
 406  * Create a framebuffer from a manager interface.
 407  */
 408 static struct st_framebuffer *
 409 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 410 {
 411    struct st_framebuffer *stfb;
 412    struct gl_config mode;
 413    gl_buffer_index idx;
 414
 415    if (!stfbi)
 416       return NULL;
 417
 418    stfb = CALLOC_STRUCT(st_framebuffer);
 419    if (!stfb)
 420       return NULL;
 421
 422    st_visual_to_context_mode(stfbi->visual, &mode);
 423    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 424
 425    stfb->iface = stfbi;
 426    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 427
 428    /* add the color buffer */
 429    idx = stfb->Base._ColorDrawBufferIndexes[0];
 430    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 431       FREE(stfb);
 432       return NULL;
 433    }
 434
 435    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 436    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 437
 438    stfb->stamp = 0;
 439    st_framebuffer_update_attachments(stfb);
 440
 441    stfb->Base.Initialized = GL_TRUE;
 442
 443    return stfb;
 444 }
 445
 446 /**
 447  * Reference a framebuffer.
 448  */
 449 static void
 450 st_framebuffer_reference(struct st_framebuffer **ptr,
 451                          struct st_framebuffer *stfb)
 452 {
 453    struct gl_framebuffer *fb = &stfb->Base;
 454    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 455 }
 456
 457 static void
 458 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 459                  struct pipe_fence_handle **fence)
 460 {
 461    struct st_context *st = (struct st_context *) stctxi;
 462    st_flush(st, fence);
 463    if (flags & ST_FLUSH_FRONT)
 464       st_manager_flush_frontbuffer(st);
 465 }
 466
 467 static boolean
 468 st_context_teximage(struct st_context_iface *stctxi,
 469                     enum st_texture_type target,
 470                     int level, enum pipe_format internal_format,
 471                     struct pipe_resource *tex, boolean mipmap)
 472 {
 473    struct st_context *st = (struct st_context *) stctxi;
 474    struct gl_context *ctx = st->ctx;
 475    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 476    struct gl_texture_object *texObj;
 477    struct gl_texture_image *texImage;
 478    struct st_texture_object *stObj;
 479    struct st_texture_image *stImage;
 480    GLenum internalFormat;
 481    GLuint width, height, depth;
 482
 483    switch (target) {
 484    case ST_TEXTURE_1D:
 485       target = GL_TEXTURE_1D;
 486       break;
 487    case ST_TEXTURE_2D:
 488       target = GL_TEXTURE_2D;
 489       break;
 490    case ST_TEXTURE_3D:
 491       target = GL_TEXTURE_3D;
 492       break;
 493    case ST_TEXTURE_RECT:
 494       target = GL_TEXTURE_RECTANGLE_ARB;
 495       break;
 496    default:
 497       return FALSE;
 498       break;
 499    }
 500
 501    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 502    _mesa_lock_texture(ctx, texObj);
 503
 504    stObj = st_texture_object(texObj);
 505    /* switch to surface based */
 506    if (!stObj->surface_based) {
 507       _mesa_clear_texture_object(ctx, texObj);
 508       stObj->surface_based = GL_TRUE;
 509    }
 510
 511    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 512    stImage = st_texture_image(texImage);
 513    if (tex) {
 514       gl_format texFormat;
 515
 516       /*
 517        * XXX When internal_format and tex->format differ, st_finalize_texture
 518        * needs to allocate a new texture with internal_format and copy the
 519        * texture here into the new one.  It will result in surface_copy being
 520        * called on surfaces whose formats differ.
 521        *
 522        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 523        * is to use a sampler view.
 524        */
 525       if (!st_sampler_compat_formats(tex->format, internal_format))
 526          internal_format = tex->format;
 527
 528       if (util_format_get_component_bits(internal_format,
 529                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 530          internalFormat = GL_RGBA;
 531       else
 532          internalFormat = GL_RGB;
 533
 534       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 535                                          GL_BGRA, GL_UNSIGNED_BYTE);
 536
 537       _mesa_init_teximage_fields(ctx, texImage,
 538                                  tex->width0, tex->height0, 1, 0,
 539                                  internalFormat, texFormat);
 540
 541       width = tex->width0;
 542       height = tex->height0;
 543       depth = tex->depth0;
 544
 545       /* grow the image size until we hit level = 0 */
 546       while (level > 0) {
 547          if (width != 1)
 548             width <<= 1;
 549          if (height != 1)
 550             height <<= 1;
 551          if (depth != 1)
 552             depth <<= 1;
 553          level--;
 554       }
 555    }
 556    else {
 557       _mesa_clear_texture_image(ctx, texImage);
 558       width = height = depth = 0;
 559    }
 560
 561    pipe_resource_reference(&stImage->pt, tex);
 562    stObj->width0 = width;
 563    stObj->height0 = height;
 564    stObj->depth0 = depth;
 565
 566    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 567    _mesa_unlock_texture(ctx, texObj);
 568
 569    return TRUE;
 570 }
 571
 572 static void
 573 st_context_copy(struct st_context_iface *stctxi,
 574                 struct st_context_iface *stsrci, unsigned mask)
 575 {
 576    struct st_context *st = (struct st_context *) stctxi;
 577    struct st_context *src = (struct st_context *) stsrci;
 578
 579    _mesa_copy_context(src->ctx, st->ctx, mask);
 580 }
 581
 582 static boolean
 583 st_context_share(struct st_context_iface *stctxi,
 584                  struct st_context_iface *stsrci)
 585 {
 586    struct st_context *st = (struct st_context *) stctxi;
 587    struct st_context *src = (struct st_context *) stsrci;
 588
 589    return _mesa_share_state(st->ctx, src->ctx);
 590 }
 591
 592 static void
 593 st_context_destroy(struct st_context_iface *stctxi)
 594 {
 595    struct st_context *st = (struct st_context *) stctxi;
 596    st_destroy_context(st);
 597 }
 598
 599 static struct st_context_iface *
 600 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 601                       const struct st_context_attribs *attribs,
 602                       enum st_context_error *error,
 603                       struct st_context_iface *shared_stctxi)
 604 {
 605    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 606    struct st_context *st;
 607    struct pipe_context *pipe;
 608    struct gl_config mode;
 609    gl_api api;
 610
 611    if (!(stapi->profile_mask & (1 << attribs->profile)))
 612       return NULL;
 613
 614    switch (attribs->profile) {
 615    case ST_PROFILE_DEFAULT:
 616       api = API_OPENGL;
 617       break;
 618    case ST_PROFILE_OPENGL_ES1:
 619       api = API_OPENGLES;
 620       break;
 621    case ST_PROFILE_OPENGL_ES2:
 622       api = API_OPENGLES2;
 623       break;
 624    case ST_PROFILE_OPENGL_CORE:
 625    default:
 626       *error = ST_CONTEXT_ERROR_BAD_API;
 627       return NULL;
 628       break;
 629    }
 630
 631    pipe = smapi->screen->context_create(smapi->screen, NULL);
 632    if (!pipe) {
 633       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 634       return NULL;
 635    }
 636
 637    st_visual_to_context_mode(&attribs->visual, &mode);
 638    st = st_create_context(api, pipe, &mode, shared_ctx);
 639    if (!st) {
 640       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 641       pipe->destroy(pipe);
 642       return NULL;
 643    }
 644
 645    /* need to perform version check */
 646    if (attribs->major > 1 || attribs->minor > 0) {
 647       _mesa_compute_version(st->ctx);
 648
 649       /* Is the actual version less than the requested version?  Mesa can't
 650        * yet enforce the added restrictions of a forward-looking context, so
 651        * fail that too.
 652        */
 653       if (st->ctx->VersionMajor * 10 + st->ctx->VersionMinor <
 654           attribs->major * 10 + attribs->minor
 655           || (attribs->flags & ~ST_CONTEXT_FLAG_DEBUG) != 0) {
 656          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 657          st_destroy_context(st);
 658          return NULL;
 659       }
 660    }
 661
 662    st->invalidate_on_gl_viewport =
 663       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 664
 665    st->iface.destroy = st_context_destroy;
 666    st->iface.flush = st_context_flush;
 667    st->iface.teximage = st_context_teximage;
 668    st->iface.copy = st_context_copy;
 669    st->iface.share = st_context_share;
 670    st->iface.st_context_private = (void *) smapi;
 671
 672    *error = ST_CONTEXT_SUCCESS;
 673    return &st->iface;
 674 }
 675
 676 static struct st_context_iface *
 677 st_api_get_current(struct st_api *stapi)
 678 {
 679    GET_CURRENT_CONTEXT(ctx);
 680    struct st_context *st = (ctx) ? ctx->st : NULL;
 681
 682    return (st) ? &st->iface : NULL;
 683 }
 684
 685 static struct st_framebuffer *
 686 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 687                                struct st_framebuffer_iface *stfbi)
 688 {
 689    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 690
 691    if (cur && cur->iface == stfbi) {
 692       /* reuse the current stfb */
 693       st_framebuffer_reference(&stfb, cur);
 694    }
 695    else {
 696       /* create a new one */
 697       stfb = st_framebuffer_create(stfbi);
 698    }
 699
 700    return stfb;
 701 }
 702
 703 static boolean
 704 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 705                     struct st_framebuffer_iface *stdrawi,
 706                     struct st_framebuffer_iface *streadi)
 707 {
 708    struct st_context *st = (struct st_context *) stctxi;
 709    struct st_framebuffer *stdraw, *stread;
 710    boolean ret;
 711
 712    _glapi_check_multithread();
 713
 714    if (st) {
 715       /* reuse or create the draw fb */
 716       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 717                                               stdrawi);
 718       if (streadi != stdrawi) {
 719          /* do the same for the read fb */
 720          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 721                                                  streadi);
 722       }
 723       else {
 724          stread = NULL;
 725          /* reuse the draw fb for the read fb */
 726          if (stdraw)
 727             st_framebuffer_reference(&stread, stdraw);
 728       }
 729
 730       if (stdraw && stread) {
 731          st_framebuffer_validate(stdraw, st);
 732          if (stread != stdraw)
 733             st_framebuffer_validate(stread, st);
 734
 735          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 736
 737          st->draw_stamp = stdraw->stamp - 1;
 738          st->read_stamp = stread->stamp - 1;
 739          st_context_validate(st, stdraw, stread);
 740       }
 741       else {
 742          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 743          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 744       }
 745
 746       st_framebuffer_reference(&stdraw, NULL);
 747       st_framebuffer_reference(&stread, NULL);
 748    }
 749    else {
 750       ret = _mesa_make_current(NULL, NULL, NULL);
 751    }
 752
 753    return ret;
 754 }
 755
 756 static st_proc_t
 757 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 758 {
 759    return (st_proc_t) _glapi_get_proc_address(procname);
 760 }
 761
 762 static void
 763 st_api_destroy(struct st_api *stapi)
 764 {
 765 }
 766
 767 /**
 768  * Flush the front buffer if the current context renders to the front buffer.
 769  */
 770 void
 771 st_manager_flush_frontbuffer(struct st_context *st)
 772 {
 773    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 774    struct st_renderbuffer *strb = NULL;
 775
 776    if (stfb)
 777       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 778    if (!strb)
 779       return;
 780
 781    /* never a dummy fb */
 782    assert(stfb->iface);
 783    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 784 }
 785
 786 /**
 787  * Return the surface of an EGLImage.
 788  * FIXME: I think this should operate on resources, not surfaces
 789  */
 790 struct pipe_surface *
 791 st_manager_get_egl_image_surface(struct st_context *st,
 792                                  void *eglimg, unsigned usage)
 793 {
 794    struct st_manager *smapi =
 795       (struct st_manager *) st->iface.st_context_private;
 796    struct st_egl_image stimg;
 797    struct pipe_surface *ps, surf_tmpl;
 798
 799    if (!smapi || !smapi->get_egl_image)
 800       return NULL;
 801
 802    memset(&stimg, 0, sizeof(stimg));
 803    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 804       return NULL;
 805
 806    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 807    surf_tmpl.format = stimg.texture->format;
 808    surf_tmpl.usage = usage;
 809    surf_tmpl.u.tex.level = stimg.level;
 810    surf_tmpl.u.tex.first_layer = stimg.layer;
 811    surf_tmpl.u.tex.last_layer = stimg.layer;
 812    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 813    pipe_resource_reference(&stimg.texture, NULL);
 814
 815    return ps;
 816 }
 817
 818 /**
 819  * Re-validate the framebuffers.
 820  */
 821 void
 822 st_manager_validate_framebuffers(struct st_context *st)
 823 {
 824    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 825    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 826
 827    if (stdraw)
 828       st_framebuffer_validate(stdraw, st);
 829    if (stread && stread != stdraw)
 830       st_framebuffer_validate(stread, st);
 831
 832    st_context_validate(st, stdraw, stread);
 833 }
 834
 835 /**
 836  * Add a color renderbuffer on demand.
 837  */
 838 boolean
 839 st_manager_add_color_renderbuffer(struct st_context *st,
 840                                   struct gl_framebuffer *fb,
 841                                   gl_buffer_index idx)
 842 {
 843    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 844
 845    /* FBO */
 846    if (!stfb)
 847       return FALSE;
 848
 849    if (stfb->Base.Attachment[idx].Renderbuffer)
 850       return TRUE;
 851
 852    switch (idx) {
 853    case BUFFER_FRONT_LEFT:
 854    case BUFFER_BACK_LEFT:
 855    case BUFFER_FRONT_RIGHT:
 856    case BUFFER_BACK_RIGHT:
 857       break;
 858    default:
 859       return FALSE;
 860       break;
 861    }
 862
 863    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 864       return FALSE;
 865
 866    st_framebuffer_update_attachments(stfb);
 867
 868    /*
 869     * Force a call to the state tracker manager to validate the
 870     * new renderbuffer. It might be that there is a window system
 871     * renderbuffer available.
 872     */
 873    if(stfb->iface)
 874       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 875
 876    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 877
 878    return TRUE;
 879 }
 880
 881 static const struct st_api st_gl_api = {
 882    "Mesa " MESA_VERSION_STRING,
 883    ST_API_OPENGL,
 884 #if FEATURE_GL
 885    ST_PROFILE_DEFAULT_MASK |
 886 #endif
 887 #if FEATURE_ES1
 888    ST_PROFILE_OPENGL_ES1_MASK |
 889 #endif
 890 #if FEATURE_ES2
 891    ST_PROFILE_OPENGL_ES2_MASK |
 892 #endif
 893    0,
 894    st_api_destroy,
 895    st_api_get_proc_address,
 896    st_api_create_context,
 897    st_api_make_current,
 898    st_api_get_current,
 899 };
 900
 901 struct st_api *
 902 st_gl_api_create(void)
 903 {
 904    return (struct st_api *) &st_gl_api;
 905 }