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 we need to pass in is s dummy context needed only to be
 174  * able to get a pipe context to create pipe surfaces, and to have a
 175  * context to call _mesa_resize_framebuffer():
 176  * (That should probably be rethought, since those surfaces become
 177  * drawable state, not context state, and can be freed by another pipe
 178  * context).
 179  */
 180 static void
 181 st_framebuffer_validate(struct st_framebuffer *stfb,
 182                         struct st_context *st)
 183 {
 184    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 185    uint width, height;
 186    unsigned i;
 187    boolean changed = FALSE;
 188    int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);
 189
 190    if (stfb->iface_stamp == new_stamp)
 191       return;
 192
 193    /* validate the fb */
 194    do {
 195       if (!stfb->iface->validate(stfb->iface, stfb->statts,
 196                                  stfb->num_statts, textures))
 197          return;
 198
 199       stfb->iface_stamp = new_stamp;
 200       new_stamp = p_atomic_read(&stfb->iface->stamp);
 201    } while(stfb->iface_stamp != new_stamp);
 202
 203    width = stfb->Base.Width;
 204    height = stfb->Base.Height;
 205
 206    for (i = 0; i < stfb->num_statts; i++) {
 207       struct st_renderbuffer *strb;
 208       struct pipe_surface *ps, surf_tmpl;
 209       gl_buffer_index idx;
 210
 211       if (!textures[i])
 212          continue;
 213
 214       idx = attachment_to_buffer_index(stfb->statts[i]);
 215       if (idx >= BUFFER_COUNT) {
 216          pipe_resource_reference(&textures[i], NULL);
 217          continue;
 218       }
 219
 220       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 221       assert(strb);
 222       if (strb->texture == textures[i]) {
 223          pipe_resource_reference(&textures[i], NULL);
 224          continue;
 225       }
 226
 227       u_surface_default_template(&surf_tmpl, textures[i]);
 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    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    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 315    if (!rb)
 316       return FALSE;
 317
 318    if (idx != BUFFER_DEPTH) {
 319       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 320    }
 321    else {
 322       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 323          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 324       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 325          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 326    }
 327
 328    return TRUE;
 329 }
 330
 331 /**
 332  * Intialize a struct gl_config from a visual.
 333  */
 334 static void
 335 st_visual_to_context_mode(const struct st_visual *visual,
 336                           struct gl_config *mode)
 337 {
 338    memset(mode, 0, sizeof(*mode));
 339
 340    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 341       mode->doubleBufferMode = GL_TRUE;
 342    if (st_visual_have_buffers(visual,
 343             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 344       mode->stereoMode = GL_TRUE;
 345
 346    if (visual->color_format != PIPE_FORMAT_NONE) {
 347       mode->rgbMode = GL_TRUE;
 348
 349       mode->redBits =
 350          util_format_get_component_bits(visual->color_format,
 351                UTIL_FORMAT_COLORSPACE_RGB, 0);
 352       mode->greenBits =
 353          util_format_get_component_bits(visual->color_format,
 354                UTIL_FORMAT_COLORSPACE_RGB, 1);
 355       mode->blueBits =
 356          util_format_get_component_bits(visual->color_format,
 357                UTIL_FORMAT_COLORSPACE_RGB, 2);
 358       mode->alphaBits =
 359          util_format_get_component_bits(visual->color_format,
 360                UTIL_FORMAT_COLORSPACE_RGB, 3);
 361
 362       mode->rgbBits = mode->redBits +
 363          mode->greenBits + mode->blueBits + mode->alphaBits;
 364    }
 365
 366    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 367       mode->depthBits =
 368          util_format_get_component_bits(visual->depth_stencil_format,
 369                UTIL_FORMAT_COLORSPACE_ZS, 0);
 370       mode->stencilBits =
 371          util_format_get_component_bits(visual->depth_stencil_format,
 372                UTIL_FORMAT_COLORSPACE_ZS, 1);
 373
 374       mode->haveDepthBuffer = mode->depthBits > 0;
 375       mode->haveStencilBuffer = mode->stencilBits > 0;
 376    }
 377
 378    if (visual->accum_format != PIPE_FORMAT_NONE) {
 379       mode->haveAccumBuffer = GL_TRUE;
 380
 381       mode->accumRedBits =
 382          util_format_get_component_bits(visual->accum_format,
 383                UTIL_FORMAT_COLORSPACE_RGB, 0);
 384       mode->accumGreenBits =
 385          util_format_get_component_bits(visual->accum_format,
 386                UTIL_FORMAT_COLORSPACE_RGB, 1);
 387       mode->accumBlueBits =
 388          util_format_get_component_bits(visual->accum_format,
 389                UTIL_FORMAT_COLORSPACE_RGB, 2);
 390       mode->accumAlphaBits =
 391          util_format_get_component_bits(visual->accum_format,
 392                UTIL_FORMAT_COLORSPACE_RGB, 3);
 393    }
 394
 395    if (visual->samples > 1) {
 396       mode->sampleBuffers = 1;
 397       mode->samples = visual->samples;
 398    }
 399 }
 400
 401 /**
 402  * Create a framebuffer from a manager interface.
 403  */
 404 static struct st_framebuffer *
 405 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 406 {
 407    struct st_framebuffer *stfb;
 408    struct gl_config mode;
 409    gl_buffer_index idx;
 410
 411    if (!stfbi)
 412       return NULL;
 413
 414    stfb = CALLOC_STRUCT(st_framebuffer);
 415    if (!stfb)
 416       return NULL;
 417
 418    st_visual_to_context_mode(stfbi->visual, &mode);
 419    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 420
 421    stfb->iface = stfbi;
 422    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 423
 424    /* add the color buffer */
 425    idx = stfb->Base._ColorDrawBufferIndexes[0];
 426    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 427       free(stfb);
 428       return NULL;
 429    }
 430
 431    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 432    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 433
 434    stfb->stamp = 0;
 435    st_framebuffer_update_attachments(stfb);
 436
 437    stfb->Base.Initialized = GL_TRUE;
 438
 439    return stfb;
 440 }
 441
 442 /**
 443  * Reference a framebuffer.
 444  */
 445 static void
 446 st_framebuffer_reference(struct st_framebuffer **ptr,
 447                          struct st_framebuffer *stfb)
 448 {
 449    struct gl_framebuffer *fb = &stfb->Base;
 450    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 451 }
 452
 453 static void
 454 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 455                  struct pipe_fence_handle **fence)
 456 {
 457    struct st_context *st = (struct st_context *) stctxi;
 458    enum pipe_flush_flags pipe_flags = 0;
 459
 460    if (flags & ST_FLUSH_END_OF_FRAME) {
 461       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 462    }
 463
 464    st_flush(st, fence, pipe_flags);
 465    if (flags & ST_FLUSH_FRONT)
 466       st_manager_flush_frontbuffer(st);
 467 }
 468
 469 static boolean
 470 st_context_teximage(struct st_context_iface *stctxi,
 471                     enum st_texture_type tex_type,
 472                     int level, enum pipe_format internal_format,
 473                     struct pipe_resource *tex, boolean mipmap)
 474 {
 475    struct st_context *st = (struct st_context *) stctxi;
 476    struct gl_context *ctx = st->ctx;
 477    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 478    struct gl_texture_object *texObj;
 479    struct gl_texture_image *texImage;
 480    struct st_texture_object *stObj;
 481    struct st_texture_image *stImage;
 482    GLenum internalFormat;
 483    GLuint width, height, depth;
 484    GLenum target;
 485
 486    switch (tex_type) {
 487    case ST_TEXTURE_1D:
 488       target = GL_TEXTURE_1D;
 489       break;
 490    case ST_TEXTURE_2D:
 491       target = GL_TEXTURE_2D;
 492       break;
 493    case ST_TEXTURE_3D:
 494       target = GL_TEXTURE_3D;
 495       break;
 496    case ST_TEXTURE_RECT:
 497       target = GL_TEXTURE_RECTANGLE_ARB;
 498       break;
 499    default:
 500       return FALSE;
 501    }
 502
 503    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 504    _mesa_lock_texture(ctx, texObj);
 505
 506    stObj = st_texture_object(texObj);
 507    /* switch to surface based */
 508    if (!stObj->surface_based) {
 509       _mesa_clear_texture_object(ctx, texObj);
 510       stObj->surface_based = GL_TRUE;
 511    }
 512
 513    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 514    stImage = st_texture_image(texImage);
 515    if (tex) {
 516       gl_format texFormat;
 517
 518       /*
 519        * XXX When internal_format and tex->format differ, st_finalize_texture
 520        * needs to allocate a new texture with internal_format and copy the
 521        * texture here into the new one.  It will result in surface_copy being
 522        * called on surfaces whose formats differ.
 523        *
 524        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 525        * is to use a sampler view.
 526        */
 527       if (!st_sampler_compat_formats(tex->format, internal_format))
 528          internal_format = tex->format;
 529
 530       if (util_format_get_component_bits(internal_format,
 531                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 532          internalFormat = GL_RGBA;
 533       else
 534          internalFormat = GL_RGB;
 535
 536       texFormat = st_ChooseTextureFormat(ctx, target, internalFormat,
 537                                          GL_BGRA, GL_UNSIGNED_BYTE);
 538
 539       _mesa_init_teximage_fields(ctx, texImage,
 540                                  tex->width0, tex->height0, 1, 0,
 541                                  internalFormat, texFormat);
 542
 543       width = tex->width0;
 544       height = tex->height0;
 545       depth = tex->depth0;
 546
 547       /* grow the image size until we hit level = 0 */
 548       while (level > 0) {
 549          if (width != 1)
 550             width <<= 1;
 551          if (height != 1)
 552             height <<= 1;
 553          if (depth != 1)
 554             depth <<= 1;
 555          level--;
 556       }
 557    }
 558    else {
 559       _mesa_clear_texture_image(ctx, texImage);
 560       width = height = depth = 0;
 561    }
 562
 563    pipe_resource_reference(&stImage->pt, tex);
 564    stObj->width0 = width;
 565    stObj->height0 = height;
 566    stObj->depth0 = depth;
 567
 568    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 569    _mesa_unlock_texture(ctx, texObj);
 570
 571    return TRUE;
 572 }
 573
 574 static void
 575 st_context_copy(struct st_context_iface *stctxi,
 576                 struct st_context_iface *stsrci, unsigned mask)
 577 {
 578    struct st_context *st = (struct st_context *) stctxi;
 579    struct st_context *src = (struct st_context *) stsrci;
 580
 581    _mesa_copy_context(src->ctx, st->ctx, mask);
 582 }
 583
 584 static boolean
 585 st_context_share(struct st_context_iface *stctxi,
 586                  struct st_context_iface *stsrci)
 587 {
 588    struct st_context *st = (struct st_context *) stctxi;
 589    struct st_context *src = (struct st_context *) stsrci;
 590
 591    return _mesa_share_state(st->ctx, src->ctx);
 592 }
 593
 594 static void
 595 st_context_destroy(struct st_context_iface *stctxi)
 596 {
 597    struct st_context *st = (struct st_context *) stctxi;
 598    st_destroy_context(st);
 599 }
 600
 601 static struct st_context_iface *
 602 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 603                       const struct st_context_attribs *attribs,
 604                       enum st_context_error *error,
 605                       struct st_context_iface *shared_stctxi)
 606 {
 607    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 608    struct st_context *st;
 609    struct pipe_context *pipe;
 610    struct gl_config mode;
 611    gl_api api;
 612
 613    if (!(stapi->profile_mask & (1 << attribs->profile)))
 614       return NULL;
 615
 616    switch (attribs->profile) {
 617    case ST_PROFILE_DEFAULT:
 618       api = API_OPENGL_COMPAT;
 619       break;
 620    case ST_PROFILE_OPENGL_ES1:
 621       api = API_OPENGLES;
 622       break;
 623    case ST_PROFILE_OPENGL_ES2:
 624       api = API_OPENGLES2;
 625       break;
 626    case ST_PROFILE_OPENGL_CORE:
 627       api = API_OPENGL_CORE;
 628       break;
 629    default:
 630       *error = ST_CONTEXT_ERROR_BAD_API;
 631       return NULL;
 632       break;
 633    }
 634
 635    pipe = smapi->screen->context_create(smapi->screen, NULL);
 636    if (!pipe) {
 637       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 638       return NULL;
 639    }
 640
 641    st_visual_to_context_mode(&attribs->visual, &mode);
 642    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 643    if (!st) {
 644       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 645       pipe->destroy(pipe);
 646       return NULL;
 647    }
 648
 649    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG)
 650       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 651    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 652       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 653
 654    /* need to perform version check */
 655    if (attribs->major > 1 || attribs->minor > 0) {
 656       /* Is the actual version less than the requested version?
 657        */
 658       if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
 659          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 660          st_destroy_context(st);
 661          return NULL;
 662       }
 663    }
 664
 665    st->invalidate_on_gl_viewport =
 666       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 667
 668    st->iface.destroy = st_context_destroy;
 669    st->iface.flush = st_context_flush;
 670    st->iface.teximage = st_context_teximage;
 671    st->iface.copy = st_context_copy;
 672    st->iface.share = st_context_share;
 673    st->iface.st_context_private = (void *) smapi;
 674    st->iface.cso_context = st->cso_context;
 675    st->iface.pipe = st->pipe;
 676
 677    *error = ST_CONTEXT_SUCCESS;
 678    return &st->iface;
 679 }
 680
 681 static struct st_context_iface *
 682 st_api_get_current(struct st_api *stapi)
 683 {
 684    GET_CURRENT_CONTEXT(ctx);
 685    struct st_context *st = (ctx) ? ctx->st : NULL;
 686
 687    return (st) ? &st->iface : NULL;
 688 }
 689
 690 static struct st_framebuffer *
 691 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 692                                struct st_framebuffer_iface *stfbi)
 693 {
 694    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 695
 696    /* dummy framebuffers cant be used as st_framebuffer */
 697    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 698        cur->iface == stfbi) {
 699       /* reuse the current stfb */
 700       st_framebuffer_reference(&stfb, cur);
 701    }
 702    else {
 703       /* create a new one */
 704       stfb = st_framebuffer_create(stfbi);
 705    }
 706
 707    return stfb;
 708 }
 709
 710 static boolean
 711 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 712                     struct st_framebuffer_iface *stdrawi,
 713                     struct st_framebuffer_iface *streadi)
 714 {
 715    struct st_context *st = (struct st_context *) stctxi;
 716    struct st_framebuffer *stdraw, *stread;
 717    boolean ret;
 718
 719    _glapi_check_multithread();
 720
 721    if (st) {
 722       /* reuse or create the draw fb */
 723       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 724                                               stdrawi);
 725       if (streadi != stdrawi) {
 726          /* do the same for the read fb */
 727          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 728                                                  streadi);
 729       }
 730       else {
 731          stread = NULL;
 732          /* reuse the draw fb for the read fb */
 733          if (stdraw)
 734             st_framebuffer_reference(&stread, stdraw);
 735       }
 736
 737       if (stdraw && stread) {
 738          st_framebuffer_validate(stdraw, st);
 739          if (stread != stdraw)
 740             st_framebuffer_validate(stread, st);
 741
 742          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 743
 744          st->draw_stamp = stdraw->stamp - 1;
 745          st->read_stamp = stread->stamp - 1;
 746          st_context_validate(st, stdraw, stread);
 747       }
 748       else {
 749          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 750          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 751       }
 752
 753       st_framebuffer_reference(&stdraw, NULL);
 754       st_framebuffer_reference(&stread, NULL);
 755    }
 756    else {
 757       ret = _mesa_make_current(NULL, NULL, NULL);
 758    }
 759
 760    return ret;
 761 }
 762
 763 static st_proc_t
 764 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 765 {
 766    return (st_proc_t) _glapi_get_proc_address(procname);
 767 }
 768
 769 static void
 770 st_api_destroy(struct st_api *stapi)
 771 {
 772 }
 773
 774 /**
 775  * Flush the front buffer if the current context renders to the front buffer.
 776  */
 777 void
 778 st_manager_flush_frontbuffer(struct st_context *st)
 779 {
 780    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 781    struct st_renderbuffer *strb = NULL;
 782
 783    if (stfb)
 784       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 785    if (!strb)
 786       return;
 787
 788    /* never a dummy fb */
 789    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 790    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 791 }
 792
 793 /**
 794  * Return the surface of an EGLImage.
 795  * FIXME: I think this should operate on resources, not surfaces
 796  */
 797 struct pipe_surface *
 798 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 799 {
 800    struct st_manager *smapi =
 801       (struct st_manager *) st->iface.st_context_private;
 802    struct st_egl_image stimg;
 803    struct pipe_surface *ps, surf_tmpl;
 804
 805    if (!smapi || !smapi->get_egl_image)
 806       return NULL;
 807
 808    memset(&stimg, 0, sizeof(stimg));
 809    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 810       return NULL;
 811
 812    u_surface_default_template(&surf_tmpl, stimg.texture);
 813    surf_tmpl.u.tex.level = stimg.level;
 814    surf_tmpl.u.tex.first_layer = stimg.layer;
 815    surf_tmpl.u.tex.last_layer = stimg.layer;
 816    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 817    pipe_resource_reference(&stimg.texture, NULL);
 818
 819    return ps;
 820 }
 821
 822 /**
 823  * Re-validate the framebuffers.
 824  */
 825 void
 826 st_manager_validate_framebuffers(struct st_context *st)
 827 {
 828    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 829    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 830
 831    if (stdraw)
 832       st_framebuffer_validate(stdraw, st);
 833    if (stread && stread != stdraw)
 834       st_framebuffer_validate(stread, st);
 835
 836    st_context_validate(st, stdraw, stread);
 837 }
 838
 839 /**
 840  * Add a color renderbuffer on demand.
 841  */
 842 boolean
 843 st_manager_add_color_renderbuffer(struct st_context *st,
 844                                   struct gl_framebuffer *fb,
 845                                   gl_buffer_index idx)
 846 {
 847    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 848
 849    /* FBO */
 850    if (!stfb)
 851       return FALSE;
 852
 853    if (stfb->Base.Attachment[idx].Renderbuffer)
 854       return TRUE;
 855
 856    switch (idx) {
 857    case BUFFER_FRONT_LEFT:
 858    case BUFFER_BACK_LEFT:
 859    case BUFFER_FRONT_RIGHT:
 860    case BUFFER_BACK_RIGHT:
 861       break;
 862    default:
 863       return FALSE;
 864       break;
 865    }
 866
 867    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 868       return FALSE;
 869
 870    st_framebuffer_update_attachments(stfb);
 871
 872    /*
 873     * Force a call to the state tracker manager to validate the
 874     * new renderbuffer. It might be that there is a window system
 875     * renderbuffer available.
 876     */
 877    if(stfb->iface)
 878       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 879
 880    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 881
 882    return TRUE;
 883 }
 884
 885 static const struct st_api st_gl_api = {
 886    "Mesa " MESA_VERSION_STRING,
 887    ST_API_OPENGL,
 888 #if FEATURE_GL
 889    ST_PROFILE_DEFAULT_MASK |
 890    ST_PROFILE_OPENGL_CORE_MASK |
 891 #endif
 892 #if FEATURE_ES1
 893    ST_PROFILE_OPENGL_ES1_MASK |
 894 #endif
 895 #if FEATURE_ES2
 896    ST_PROFILE_OPENGL_ES2_MASK |
 897 #endif
 898    0,
 899    ST_API_FEATURE_MS_VISUALS_MASK,
 900    st_api_destroy,
 901    st_api_get_proc_address,
 902    st_api_create_context,
 903    st_api_make_current,
 904    st_api_get_current,
 905 };
 906
 907 struct st_api *
 908 st_gl_api_create(void)
 909 {
 910    return (struct st_api *) &st_gl_api;
 911 }