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    if (fb && _mesa_is_winsys_fbo(fb))
  68       return (struct st_framebuffer *) fb;
  69    return NULL;
  70 }
  71
  72 /**
  73  * Map an attachment to a buffer index.
  74  */
  75 static INLINE gl_buffer_index
  76 attachment_to_buffer_index(enum st_attachment_type statt)
  77 {
  78    gl_buffer_index index;
  79
  80    switch (statt) {
  81    case ST_ATTACHMENT_FRONT_LEFT:
  82       index = BUFFER_FRONT_LEFT;
  83       break;
  84    case ST_ATTACHMENT_BACK_LEFT:
  85       index = BUFFER_BACK_LEFT;
  86       break;
  87    case ST_ATTACHMENT_FRONT_RIGHT:
  88       index = BUFFER_FRONT_RIGHT;
  89       break;
  90    case ST_ATTACHMENT_BACK_RIGHT:
  91       index = BUFFER_BACK_RIGHT;
  92       break;
  93    case ST_ATTACHMENT_DEPTH_STENCIL:
  94       index = BUFFER_DEPTH;
  95       break;
  96    case ST_ATTACHMENT_ACCUM:
  97       index = BUFFER_ACCUM;
  98       break;
  99    case ST_ATTACHMENT_SAMPLE:
 100    default:
 101       index = BUFFER_COUNT;
 102       break;
 103    }
 104
 105    return index;
 106 }
 107
 108 /**
 109  * Map a buffer index to an attachment.
 110  */
 111 static INLINE enum st_attachment_type
 112 buffer_index_to_attachment(gl_buffer_index index)
 113 {
 114    enum st_attachment_type statt;
 115
 116    switch (index) {
 117    case BUFFER_FRONT_LEFT:
 118       statt = ST_ATTACHMENT_FRONT_LEFT;
 119       break;
 120    case BUFFER_BACK_LEFT:
 121       statt = ST_ATTACHMENT_BACK_LEFT;
 122       break;
 123    case BUFFER_FRONT_RIGHT:
 124       statt = ST_ATTACHMENT_FRONT_RIGHT;
 125       break;
 126    case BUFFER_BACK_RIGHT:
 127       statt = ST_ATTACHMENT_BACK_RIGHT;
 128       break;
 129    case BUFFER_DEPTH:
 130       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 131       break;
 132    case BUFFER_ACCUM:
 133       statt = ST_ATTACHMENT_ACCUM;
 134       break;
 135    default:
 136       statt = ST_ATTACHMENT_INVALID;
 137       break;
 138    }
 139
 140    return statt;
 141 }
 142
 143 /**
 144  * Make sure a context picks up the latest cached state of the
 145  * drawables it binds to.
 146  */
 147 static void
 148 st_context_validate(struct st_context *st,
 149                     struct st_framebuffer *stdraw,
 150                     struct st_framebuffer *stread)
 151 {
 152     if (stdraw && stdraw->stamp != st->draw_stamp) {
 153        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 154        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 155                                 stdraw->Base.Width,
 156                                 stdraw->Base.Height);
 157        st->draw_stamp = stdraw->stamp;
 158     }
 159
 160     if (stread && stread->stamp != st->read_stamp) {
 161        if (stread != stdraw) {
 162           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 163           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 164                                    stread->Base.Width,
 165                                    stread->Base.Height);
 166        }
 167        st->read_stamp = stread->stamp;
 168     }
 169 }
 170
 171 /**
 172  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 173  * The context is only used for creating pipe surfaces and for calling
 174  * _mesa_resize_framebuffer().
 175  * (That should probably be rethought, since those surfaces become
 176  * drawable state, not context state, and can be freed by another pipe
 177  * context).
 178  */
 179 static void
 180 st_framebuffer_validate(struct st_framebuffer *stfb,
 181                         struct st_context *st)
 182 {
 183    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 184    uint width, height;
 185    unsigned i;
 186    boolean changed = FALSE;
 187    int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);
 188
 189    if (stfb->iface_stamp == new_stamp)
 190       return;
 191
 192    /* validate the fb */
 193    do {
 194       if (!stfb->iface->validate(stfb->iface, stfb->statts,
 195                                  stfb->num_statts, textures))
 196          return;
 197
 198       stfb->iface_stamp = new_stamp;
 199       new_stamp = p_atomic_read(&stfb->iface->stamp);
 200    } while(stfb->iface_stamp != new_stamp);
 201
 202    width = stfb->Base.Width;
 203    height = stfb->Base.Height;
 204
 205    for (i = 0; i < stfb->num_statts; i++) {
 206       struct st_renderbuffer *strb;
 207       struct pipe_surface *ps, surf_tmpl;
 208       gl_buffer_index idx;
 209
 210       if (!textures[i])
 211          continue;
 212
 213       idx = attachment_to_buffer_index(stfb->statts[i]);
 214       if (idx >= BUFFER_COUNT) {
 215          pipe_resource_reference(&textures[i], NULL);
 216          continue;
 217       }
 218
 219       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 220       assert(strb);
 221       if (strb->texture == textures[i]) {
 222          pipe_resource_reference(&textures[i], NULL);
 223          continue;
 224       }
 225
 226       u_surface_default_template(&surf_tmpl, textures[i]);
 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    boolean sw;
 287
 288    if (!stfb->iface)
 289       return FALSE;
 290
 291    /* do not distinguish depth/stencil buffers */
 292    if (idx == BUFFER_STENCIL)
 293       idx = BUFFER_DEPTH;
 294
 295    switch (idx) {
 296    case BUFFER_DEPTH:
 297       format = stfb->iface->visual->depth_stencil_format;
 298       sw = FALSE;
 299       break;
 300    case BUFFER_ACCUM:
 301       format = stfb->iface->visual->accum_format;
 302       sw = TRUE;
 303       break;
 304    default:
 305       format = stfb->iface->visual->color_format;
 306       sw = FALSE;
 307       break;
 308    }
 309
 310    if (format == PIPE_FORMAT_NONE)
 311       return FALSE;
 312
 313    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 314    if (!rb)
 315       return FALSE;
 316
 317    if (idx != BUFFER_DEPTH) {
 318       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 319    }
 320    else {
 321       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 322          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 323       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 324          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 325    }
 326
 327    return TRUE;
 328 }
 329
 330 /**
 331  * Intialize a struct gl_config from a visual.
 332  */
 333 static void
 334 st_visual_to_context_mode(const struct st_visual *visual,
 335                           struct gl_config *mode)
 336 {
 337    memset(mode, 0, sizeof(*mode));
 338
 339    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 340       mode->doubleBufferMode = GL_TRUE;
 341    if (st_visual_have_buffers(visual,
 342             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 343       mode->stereoMode = GL_TRUE;
 344
 345    if (visual->color_format != PIPE_FORMAT_NONE) {
 346       mode->rgbMode = GL_TRUE;
 347
 348       mode->redBits =
 349          util_format_get_component_bits(visual->color_format,
 350                UTIL_FORMAT_COLORSPACE_RGB, 0);
 351       mode->greenBits =
 352          util_format_get_component_bits(visual->color_format,
 353                UTIL_FORMAT_COLORSPACE_RGB, 1);
 354       mode->blueBits =
 355          util_format_get_component_bits(visual->color_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 2);
 357       mode->alphaBits =
 358          util_format_get_component_bits(visual->color_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 3);
 360
 361       mode->rgbBits = mode->redBits +
 362          mode->greenBits + mode->blueBits + mode->alphaBits;
 363    }
 364
 365    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 366       mode->depthBits =
 367          util_format_get_component_bits(visual->depth_stencil_format,
 368                UTIL_FORMAT_COLORSPACE_ZS, 0);
 369       mode->stencilBits =
 370          util_format_get_component_bits(visual->depth_stencil_format,
 371                UTIL_FORMAT_COLORSPACE_ZS, 1);
 372
 373       mode->haveDepthBuffer = mode->depthBits > 0;
 374       mode->haveStencilBuffer = mode->stencilBits > 0;
 375    }
 376
 377    if (visual->accum_format != PIPE_FORMAT_NONE) {
 378       mode->haveAccumBuffer = GL_TRUE;
 379
 380       mode->accumRedBits =
 381          util_format_get_component_bits(visual->accum_format,
 382                UTIL_FORMAT_COLORSPACE_RGB, 0);
 383       mode->accumGreenBits =
 384          util_format_get_component_bits(visual->accum_format,
 385                UTIL_FORMAT_COLORSPACE_RGB, 1);
 386       mode->accumBlueBits =
 387          util_format_get_component_bits(visual->accum_format,
 388                UTIL_FORMAT_COLORSPACE_RGB, 2);
 389       mode->accumAlphaBits =
 390          util_format_get_component_bits(visual->accum_format,
 391                UTIL_FORMAT_COLORSPACE_RGB, 3);
 392    }
 393
 394    if (visual->samples > 1) {
 395       mode->sampleBuffers = 1;
 396       mode->samples = visual->samples;
 397    }
 398 }
 399
 400 /**
 401  * Create a framebuffer from a manager interface.
 402  */
 403 static struct st_framebuffer *
 404 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 405 {
 406    struct st_framebuffer *stfb;
 407    struct gl_config mode;
 408    gl_buffer_index idx;
 409
 410    if (!stfbi)
 411       return NULL;
 412
 413    stfb = CALLOC_STRUCT(st_framebuffer);
 414    if (!stfb)
 415       return NULL;
 416
 417    st_visual_to_context_mode(stfbi->visual, &mode);
 418    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 419
 420    stfb->iface = stfbi;
 421    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 422
 423    /* add the color buffer */
 424    idx = stfb->Base._ColorDrawBufferIndexes[0];
 425    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 426       free(stfb);
 427       return NULL;
 428    }
 429
 430    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 431    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 432
 433    stfb->stamp = 0;
 434    st_framebuffer_update_attachments(stfb);
 435
 436    stfb->Base.Initialized = GL_TRUE;
 437
 438    return stfb;
 439 }
 440
 441 /**
 442  * Reference a framebuffer.
 443  */
 444 static void
 445 st_framebuffer_reference(struct st_framebuffer **ptr,
 446                          struct st_framebuffer *stfb)
 447 {
 448    struct gl_framebuffer *fb = &stfb->Base;
 449    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 450 }
 451
 452 static void
 453 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 454                  struct pipe_fence_handle **fence)
 455 {
 456    struct st_context *st = (struct st_context *) stctxi;
 457    enum pipe_flush_flags pipe_flags = 0;
 458
 459    if (flags & ST_FLUSH_END_OF_FRAME) {
 460       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 461    }
 462
 463    st_flush(st, fence, pipe_flags);
 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 tex_type,
 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    GLenum target;
 484
 485    switch (tex_type) {
 486    case ST_TEXTURE_1D:
 487       target = GL_TEXTURE_1D;
 488       break;
 489    case ST_TEXTURE_2D:
 490       target = GL_TEXTURE_2D;
 491       break;
 492    case ST_TEXTURE_3D:
 493       target = GL_TEXTURE_3D;
 494       break;
 495    case ST_TEXTURE_RECT:
 496       target = GL_TEXTURE_RECTANGLE_ARB;
 497       break;
 498    default:
 499       return FALSE;
 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, target, internalFormat,
 536                                          GL_BGRA, GL_UNSIGNED_BYTE);
 537
 538       _mesa_init_teximage_fields(ctx, 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_COMPAT;
 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       api = API_OPENGL_CORE;
 627       break;
 628    default:
 629       *error = ST_CONTEXT_ERROR_BAD_API;
 630       return NULL;
 631       break;
 632    }
 633
 634    pipe = smapi->screen->context_create(smapi->screen, NULL);
 635    if (!pipe) {
 636       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 637       return NULL;
 638    }
 639
 640    st_visual_to_context_mode(&attribs->visual, &mode);
 641    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 642    if (!st) {
 643       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 644       pipe->destroy(pipe);
 645       return NULL;
 646    }
 647
 648    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG)
 649       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 650    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 651       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 652
 653    /* need to perform version check */
 654    if (attribs->major > 1 || attribs->minor > 0) {
 655       /* Is the actual version less than the requested version?
 656        */
 657       if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
 658          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 659          st_destroy_context(st);
 660          return NULL;
 661       }
 662    }
 663
 664    st->invalidate_on_gl_viewport =
 665       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 666
 667    st->iface.destroy = st_context_destroy;
 668    st->iface.flush = st_context_flush;
 669    st->iface.teximage = st_context_teximage;
 670    st->iface.copy = st_context_copy;
 671    st->iface.share = st_context_share;
 672    st->iface.st_context_private = (void *) smapi;
 673    st->iface.cso_context = st->cso_context;
 674    st->iface.pipe = st->pipe;
 675
 676    *error = ST_CONTEXT_SUCCESS;
 677    return &st->iface;
 678 }
 679
 680 static struct st_context_iface *
 681 st_api_get_current(struct st_api *stapi)
 682 {
 683    GET_CURRENT_CONTEXT(ctx);
 684    struct st_context *st = (ctx) ? ctx->st : NULL;
 685
 686    return (st) ? &st->iface : NULL;
 687 }
 688
 689 static struct st_framebuffer *
 690 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 691                                struct st_framebuffer_iface *stfbi)
 692 {
 693    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 694
 695    /* dummy framebuffers cant be used as st_framebuffer */
 696    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 697        cur->iface == stfbi) {
 698       /* reuse the current stfb */
 699       st_framebuffer_reference(&stfb, cur);
 700    }
 701    else {
 702       /* create a new one */
 703       stfb = st_framebuffer_create(stfbi);
 704    }
 705
 706    return stfb;
 707 }
 708
 709 static boolean
 710 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 711                     struct st_framebuffer_iface *stdrawi,
 712                     struct st_framebuffer_iface *streadi)
 713 {
 714    struct st_context *st = (struct st_context *) stctxi;
 715    struct st_framebuffer *stdraw, *stread;
 716    boolean ret;
 717
 718    _glapi_check_multithread();
 719
 720    if (st) {
 721       /* reuse or create the draw fb */
 722       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 723                                               stdrawi);
 724       if (streadi != stdrawi) {
 725          /* do the same for the read fb */
 726          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 727                                                  streadi);
 728       }
 729       else {
 730          stread = NULL;
 731          /* reuse the draw fb for the read fb */
 732          if (stdraw)
 733             st_framebuffer_reference(&stread, stdraw);
 734       }
 735
 736       if (stdraw && stread) {
 737          st_framebuffer_validate(stdraw, st);
 738          if (stread != stdraw)
 739             st_framebuffer_validate(stread, st);
 740
 741          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 742
 743          st->draw_stamp = stdraw->stamp - 1;
 744          st->read_stamp = stread->stamp - 1;
 745          st_context_validate(st, stdraw, stread);
 746       }
 747       else {
 748          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 749          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 750       }
 751
 752       st_framebuffer_reference(&stdraw, NULL);
 753       st_framebuffer_reference(&stread, NULL);
 754    }
 755    else {
 756       ret = _mesa_make_current(NULL, NULL, NULL);
 757    }
 758
 759    return ret;
 760 }
 761
 762 static st_proc_t
 763 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 764 {
 765    return (st_proc_t) _glapi_get_proc_address(procname);
 766 }
 767
 768 static void
 769 st_api_destroy(struct st_api *stapi)
 770 {
 771 }
 772
 773 /**
 774  * Flush the front buffer if the current context renders to the front buffer.
 775  */
 776 void
 777 st_manager_flush_frontbuffer(struct st_context *st)
 778 {
 779    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 780    struct st_renderbuffer *strb = NULL;
 781
 782    if (stfb)
 783       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 784    if (!strb)
 785       return;
 786
 787    /* never a dummy fb */
 788    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 789    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 790 }
 791
 792 /**
 793  * Return the surface of an EGLImage.
 794  * FIXME: I think this should operate on resources, not surfaces
 795  */
 796 struct pipe_surface *
 797 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 798 {
 799    struct st_manager *smapi =
 800       (struct st_manager *) st->iface.st_context_private;
 801    struct st_egl_image stimg;
 802    struct pipe_surface *ps, surf_tmpl;
 803
 804    if (!smapi || !smapi->get_egl_image)
 805       return NULL;
 806
 807    memset(&stimg, 0, sizeof(stimg));
 808    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 809       return NULL;
 810
 811    u_surface_default_template(&surf_tmpl, stimg.texture);
 812    surf_tmpl.u.tex.level = stimg.level;
 813    surf_tmpl.u.tex.first_layer = stimg.layer;
 814    surf_tmpl.u.tex.last_layer = stimg.layer;
 815    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 816    pipe_resource_reference(&stimg.texture, NULL);
 817
 818    return ps;
 819 }
 820
 821 /**
 822  * Re-validate the framebuffers.
 823  */
 824 void
 825 st_manager_validate_framebuffers(struct st_context *st)
 826 {
 827    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 828    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 829
 830    if (stdraw)
 831       st_framebuffer_validate(stdraw, st);
 832    if (stread && stread != stdraw)
 833       st_framebuffer_validate(stread, st);
 834
 835    st_context_validate(st, stdraw, stread);
 836 }
 837
 838 /**
 839  * Add a color renderbuffer on demand.
 840  */
 841 boolean
 842 st_manager_add_color_renderbuffer(struct st_context *st,
 843                                   struct gl_framebuffer *fb,
 844                                   gl_buffer_index idx)
 845 {
 846    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 847
 848    /* FBO */
 849    if (!stfb)
 850       return FALSE;
 851
 852    if (stfb->Base.Attachment[idx].Renderbuffer)
 853       return TRUE;
 854
 855    switch (idx) {
 856    case BUFFER_FRONT_LEFT:
 857    case BUFFER_BACK_LEFT:
 858    case BUFFER_FRONT_RIGHT:
 859    case BUFFER_BACK_RIGHT:
 860       break;
 861    default:
 862       return FALSE;
 863       break;
 864    }
 865
 866    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 867       return FALSE;
 868
 869    st_framebuffer_update_attachments(stfb);
 870
 871    /*
 872     * Force a call to the state tracker manager to validate the
 873     * new renderbuffer. It might be that there is a window system
 874     * renderbuffer available.
 875     */
 876    if(stfb->iface)
 877       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 878
 879    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 880
 881    return TRUE;
 882 }
 883
 884 static const struct st_api st_gl_api = {
 885    "Mesa " PACKAGE_VERSION,
 886    ST_API_OPENGL,
 887 #if FEATURE_GL
 888    ST_PROFILE_DEFAULT_MASK |
 889    ST_PROFILE_OPENGL_CORE_MASK |
 890 #endif
 891 #if FEATURE_ES1
 892    ST_PROFILE_OPENGL_ES1_MASK |
 893 #endif
 894 #if FEATURE_ES2
 895    ST_PROFILE_OPENGL_ES2_MASK |
 896 #endif
 897    0,
 898    ST_API_FEATURE_MS_VISUALS_MASK,
 899    st_api_destroy,
 900    st_api_get_proc_address,
 901    st_api_create_context,
 902    st_api_make_current,
 903    st_api_get_current,
 904 };
 905
 906 struct st_api *
 907 st_gl_api_create(void)
 908 {
 909    return (struct st_api *) &st_gl_api;
 910 }