src/mesa/state_tracker/st_manager.c

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