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/texobj.h"
  32 #include "main/teximage.h"
  33 #include "main/texstate.h"
  34 #include "main/framebuffer.h"
  35 #include "main/fbobject.h"
  36 #include "main/renderbuffer.h"
  37 #include "main/version.h"
  38 #include "st_texture.h"
  39
  40 #include "st_context.h"
  41 #include "st_format.h"
  42 #include "st_cb_fbo.h"
  43 #include "st_cb_flush.h"
  44 #include "st_manager.h"
  45
  46 #include "state_tracker/st_gl_api.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_screen.h"
  50 #include "util/u_format.h"
  51 #include "util/u_pointer.h"
  52 #include "util/u_inlines.h"
  53 #include "util/u_atomic.h"
  54 #include "util/u_surface.h"
  55
  56 /**
  57  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  58  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  59  * We'll only return non-null for window system framebuffers.
  60  * Note that this function may fail.
  61  */
  62 static INLINE struct st_framebuffer *
  63 st_ws_framebuffer(struct gl_framebuffer *fb)
  64 {
  65    /* FBO cannot be casted.  See st_new_framebuffer */
  66    if (fb && _mesa_is_winsys_fbo(fb))
  67       return (struct st_framebuffer *) fb;
  68    return NULL;
  69 }
  70
  71 /**
  72  * Map an attachment to a buffer index.
  73  */
  74 static INLINE gl_buffer_index
  75 attachment_to_buffer_index(enum st_attachment_type statt)
  76 {
  77    gl_buffer_index index;
  78
  79    switch (statt) {
  80    case ST_ATTACHMENT_FRONT_LEFT:
  81       index = BUFFER_FRONT_LEFT;
  82       break;
  83    case ST_ATTACHMENT_BACK_LEFT:
  84       index = BUFFER_BACK_LEFT;
  85       break;
  86    case ST_ATTACHMENT_FRONT_RIGHT:
  87       index = BUFFER_FRONT_RIGHT;
  88       break;
  89    case ST_ATTACHMENT_BACK_RIGHT:
  90       index = BUFFER_BACK_RIGHT;
  91       break;
  92    case ST_ATTACHMENT_DEPTH_STENCIL:
  93       index = BUFFER_DEPTH;
  94       break;
  95    case ST_ATTACHMENT_ACCUM:
  96       index = BUFFER_ACCUM;
  97       break;
  98    case ST_ATTACHMENT_SAMPLE:
  99    default:
 100       index = BUFFER_COUNT;
 101       break;
 102    }
 103
 104    return index;
 105 }
 106
 107 /**
 108  * Map a buffer index to an attachment.
 109  */
 110 static INLINE enum st_attachment_type
 111 buffer_index_to_attachment(gl_buffer_index index)
 112 {
 113    enum st_attachment_type statt;
 114
 115    switch (index) {
 116    case BUFFER_FRONT_LEFT:
 117       statt = ST_ATTACHMENT_FRONT_LEFT;
 118       break;
 119    case BUFFER_BACK_LEFT:
 120       statt = ST_ATTACHMENT_BACK_LEFT;
 121       break;
 122    case BUFFER_FRONT_RIGHT:
 123       statt = ST_ATTACHMENT_FRONT_RIGHT;
 124       break;
 125    case BUFFER_BACK_RIGHT:
 126       statt = ST_ATTACHMENT_BACK_RIGHT;
 127       break;
 128    case BUFFER_DEPTH:
 129       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 130       break;
 131    case BUFFER_ACCUM:
 132       statt = ST_ATTACHMENT_ACCUM;
 133       break;
 134    default:
 135       statt = ST_ATTACHMENT_INVALID;
 136       break;
 137    }
 138
 139    return statt;
 140 }
 141
 142 /**
 143  * Make sure a context picks up the latest cached state of the
 144  * drawables it binds to.
 145  */
 146 static void
 147 st_context_validate(struct st_context *st,
 148                     struct st_framebuffer *stdraw,
 149                     struct st_framebuffer *stread)
 150 {
 151     if (stdraw && stdraw->stamp != st->draw_stamp) {
 152        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 153        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 154                                 stdraw->Base.Width,
 155                                 stdraw->Base.Height);
 156        st->draw_stamp = stdraw->stamp;
 157     }
 158
 159     if (stread && stread->stamp != st->read_stamp) {
 160        if (stread != stdraw) {
 161           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 162           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 163                                    stread->Base.Width,
 164                                    stread->Base.Height);
 165        }
 166        st->read_stamp = stread->stamp;
 167     }
 168 }
 169
 170 /**
 171  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 172  * The context is only used for creating pipe surfaces and for calling
 173  * _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       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 227       if (ps) {
 228          pipe_surface_reference(&strb->surface, ps);
 229          pipe_resource_reference(&strb->texture, ps->texture);
 230          /* ownership transfered */
 231          pipe_surface_reference(&ps, NULL);
 232
 233          changed = TRUE;
 234
 235          strb->Base.Width = strb->surface->width;
 236          strb->Base.Height = strb->surface->height;
 237
 238          width = strb->Base.Width;
 239          height = strb->Base.Height;
 240       }
 241
 242       pipe_resource_reference(&textures[i], NULL);
 243    }
 244
 245    if (changed) {
 246       ++stfb->stamp;
 247       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 248    }
 249 }
 250
 251 /**
 252  * Update the attachments to validate by looping the existing renderbuffers.
 253  */
 254 static void
 255 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 256 {
 257    gl_buffer_index idx;
 258
 259    stfb->num_statts = 0;
 260    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 261       struct st_renderbuffer *strb;
 262       enum st_attachment_type statt;
 263
 264       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 265       if (!strb || strb->software)
 266          continue;
 267
 268       statt = buffer_index_to_attachment(idx);
 269       if (statt != ST_ATTACHMENT_INVALID &&
 270           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 271          stfb->statts[stfb->num_statts++] = statt;
 272    }
 273    stfb->stamp++;
 274 }
 275
 276 /**
 277  * Add a renderbuffer to the framebuffer.
 278  */
 279 static boolean
 280 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 281                                 gl_buffer_index idx)
 282 {
 283    struct gl_renderbuffer *rb;
 284    enum pipe_format format;
 285    boolean sw;
 286
 287    if (!stfb->iface)
 288       return FALSE;
 289
 290    /* do not distinguish depth/stencil buffers */
 291    if (idx == BUFFER_STENCIL)
 292       idx = BUFFER_DEPTH;
 293
 294    switch (idx) {
 295    case BUFFER_DEPTH:
 296       format = stfb->iface->visual->depth_stencil_format;
 297       sw = FALSE;
 298       break;
 299    case BUFFER_ACCUM:
 300       format = stfb->iface->visual->accum_format;
 301       sw = TRUE;
 302       break;
 303    default:
 304       format = stfb->iface->visual->color_format;
 305       sw = FALSE;
 306       break;
 307    }
 308
 309    if (format == PIPE_FORMAT_NONE)
 310       return FALSE;
 311
 312    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 313    if (!rb)
 314       return FALSE;
 315
 316    if (idx != BUFFER_DEPTH) {
 317       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 318    }
 319    else {
 320       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 321          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 322       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 323          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 324    }
 325
 326    return TRUE;
 327 }
 328
 329 /**
 330  * Intialize a struct gl_config from a visual.
 331  */
 332 static void
 333 st_visual_to_context_mode(const struct st_visual *visual,
 334                           struct gl_config *mode)
 335 {
 336    memset(mode, 0, sizeof(*mode));
 337
 338    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 339       mode->doubleBufferMode = GL_TRUE;
 340    if (st_visual_have_buffers(visual,
 341             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 342       mode->stereoMode = GL_TRUE;
 343
 344    if (visual->color_format != PIPE_FORMAT_NONE) {
 345       mode->rgbMode = GL_TRUE;
 346
 347       mode->redBits =
 348          util_format_get_component_bits(visual->color_format,
 349                UTIL_FORMAT_COLORSPACE_RGB, 0);
 350       mode->greenBits =
 351          util_format_get_component_bits(visual->color_format,
 352                UTIL_FORMAT_COLORSPACE_RGB, 1);
 353       mode->blueBits =
 354          util_format_get_component_bits(visual->color_format,
 355                UTIL_FORMAT_COLORSPACE_RGB, 2);
 356       mode->alphaBits =
 357          util_format_get_component_bits(visual->color_format,
 358                UTIL_FORMAT_COLORSPACE_RGB, 3);
 359
 360       mode->rgbBits = mode->redBits +
 361          mode->greenBits + mode->blueBits + mode->alphaBits;
 362    }
 363
 364    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 365       mode->depthBits =
 366          util_format_get_component_bits(visual->depth_stencil_format,
 367                UTIL_FORMAT_COLORSPACE_ZS, 0);
 368       mode->stencilBits =
 369          util_format_get_component_bits(visual->depth_stencil_format,
 370                UTIL_FORMAT_COLORSPACE_ZS, 1);
 371
 372       mode->haveDepthBuffer = mode->depthBits > 0;
 373       mode->haveStencilBuffer = mode->stencilBits > 0;
 374    }
 375
 376    if (visual->accum_format != PIPE_FORMAT_NONE) {
 377       mode->haveAccumBuffer = GL_TRUE;
 378
 379       mode->accumRedBits =
 380          util_format_get_component_bits(visual->accum_format,
 381                UTIL_FORMAT_COLORSPACE_RGB, 0);
 382       mode->accumGreenBits =
 383          util_format_get_component_bits(visual->accum_format,
 384                UTIL_FORMAT_COLORSPACE_RGB, 1);
 385       mode->accumBlueBits =
 386          util_format_get_component_bits(visual->accum_format,
 387                UTIL_FORMAT_COLORSPACE_RGB, 2);
 388       mode->accumAlphaBits =
 389          util_format_get_component_bits(visual->accum_format,
 390                UTIL_FORMAT_COLORSPACE_RGB, 3);
 391    }
 392
 393    if (visual->samples > 1) {
 394       mode->sampleBuffers = 1;
 395       mode->samples = visual->samples;
 396    }
 397 }
 398
 399 /**
 400  * Create a framebuffer from a manager interface.
 401  */
 402 static struct st_framebuffer *
 403 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 404 {
 405    struct st_framebuffer *stfb;
 406    struct gl_config mode;
 407    gl_buffer_index idx;
 408
 409    if (!stfbi)
 410       return NULL;
 411
 412    stfb = CALLOC_STRUCT(st_framebuffer);
 413    if (!stfb)
 414       return NULL;
 415
 416    st_visual_to_context_mode(stfbi->visual, &mode);
 417    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 418
 419    stfb->iface = stfbi;
 420    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 421
 422    /* add the color buffer */
 423    idx = stfb->Base._ColorDrawBufferIndexes[0];
 424    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 425       free(stfb);
 426       return NULL;
 427    }
 428
 429    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 430    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 431
 432    stfb->stamp = 0;
 433    st_framebuffer_update_attachments(stfb);
 434
 435    stfb->Base.Initialized = GL_TRUE;
 436
 437    return stfb;
 438 }
 439
 440 /**
 441  * Reference a framebuffer.
 442  */
 443 static void
 444 st_framebuffer_reference(struct st_framebuffer **ptr,
 445                          struct st_framebuffer *stfb)
 446 {
 447    struct gl_framebuffer *fb = &stfb->Base;
 448    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 449 }
 450
 451 static void
 452 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 453                  struct pipe_fence_handle **fence)
 454 {
 455    struct st_context *st = (struct st_context *) stctxi;
 456    enum pipe_flush_flags pipe_flags = 0;
 457
 458    if (flags & ST_FLUSH_END_OF_FRAME) {
 459       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 460    }
 461
 462    st_flush(st, fence, pipe_flags);
 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 tex_type,
 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    GLenum target;
 483
 484    switch (tex_type) {
 485    case ST_TEXTURE_1D:
 486       target = GL_TEXTURE_1D;
 487       break;
 488    case ST_TEXTURE_2D:
 489       target = GL_TEXTURE_2D;
 490       break;
 491    case ST_TEXTURE_3D:
 492       target = GL_TEXTURE_3D;
 493       break;
 494    case ST_TEXTURE_RECT:
 495       target = GL_TEXTURE_RECTANGLE_ARB;
 496       break;
 497    default:
 498       return FALSE;
 499    }
 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, target, 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_COMPAT;
 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       api = API_OPENGL_CORE;
 626       break;
 627    default:
 628       *error = ST_CONTEXT_ERROR_BAD_API;
 629       return NULL;
 630       break;
 631    }
 632
 633    pipe = smapi->screen->context_create(smapi->screen, NULL);
 634    if (!pipe) {
 635       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 636       return NULL;
 637    }
 638
 639    st_visual_to_context_mode(&attribs->visual, &mode);
 640    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 641    if (!st) {
 642       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 643       pipe->destroy(pipe);
 644       return NULL;
 645    }
 646
 647    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG)
 648       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 649    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 650       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 651
 652    /* need to perform version check */
 653    if (attribs->major > 1 || attribs->minor > 0) {
 654       /* Is the actual version less than the requested version?
 655        */
 656       if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
 657          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 658          st_destroy_context(st);
 659          return NULL;
 660       }
 661    }
 662
 663    st->invalidate_on_gl_viewport =
 664       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 665
 666    st->iface.destroy = st_context_destroy;
 667    st->iface.flush = st_context_flush;
 668    st->iface.teximage = st_context_teximage;
 669    st->iface.copy = st_context_copy;
 670    st->iface.share = st_context_share;
 671    st->iface.st_context_private = (void *) smapi;
 672    st->iface.cso_context = st->cso_context;
 673    st->iface.pipe = st->pipe;
 674
 675    *error = ST_CONTEXT_SUCCESS;
 676    return &st->iface;
 677 }
 678
 679 static struct st_context_iface *
 680 st_api_get_current(struct st_api *stapi)
 681 {
 682    GET_CURRENT_CONTEXT(ctx);
 683    struct st_context *st = (ctx) ? ctx->st : NULL;
 684
 685    return (st) ? &st->iface : NULL;
 686 }
 687
 688 static struct st_framebuffer *
 689 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 690                                struct st_framebuffer_iface *stfbi)
 691 {
 692    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 693
 694    /* dummy framebuffers cant be used as st_framebuffer */
 695    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 696        cur->iface == stfbi) {
 697       /* reuse the current stfb */
 698       st_framebuffer_reference(&stfb, cur);
 699    }
 700    else {
 701       /* create a new one */
 702       stfb = st_framebuffer_create(stfbi);
 703    }
 704
 705    return stfb;
 706 }
 707
 708 static boolean
 709 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 710                     struct st_framebuffer_iface *stdrawi,
 711                     struct st_framebuffer_iface *streadi)
 712 {
 713    struct st_context *st = (struct st_context *) stctxi;
 714    struct st_framebuffer *stdraw, *stread;
 715    boolean ret;
 716
 717    _glapi_check_multithread();
 718
 719    if (st) {
 720       /* reuse or create the draw fb */
 721       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 722                                               stdrawi);
 723       if (streadi != stdrawi) {
 724          /* do the same for the read fb */
 725          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 726                                                  streadi);
 727       }
 728       else {
 729          stread = NULL;
 730          /* reuse the draw fb for the read fb */
 731          if (stdraw)
 732             st_framebuffer_reference(&stread, stdraw);
 733       }
 734
 735       if (stdraw && stread) {
 736          st_framebuffer_validate(stdraw, st);
 737          if (stread != stdraw)
 738             st_framebuffer_validate(stread, st);
 739
 740          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 741
 742          st->draw_stamp = stdraw->stamp - 1;
 743          st->read_stamp = stread->stamp - 1;
 744          st_context_validate(st, stdraw, stread);
 745       }
 746       else {
 747          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 748          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 749       }
 750
 751       st_framebuffer_reference(&stdraw, NULL);
 752       st_framebuffer_reference(&stread, NULL);
 753    }
 754    else {
 755       ret = _mesa_make_current(NULL, NULL, NULL);
 756    }
 757
 758    return ret;
 759 }
 760
 761 static st_proc_t
 762 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 763 {
 764    return (st_proc_t) _glapi_get_proc_address(procname);
 765 }
 766
 767 static void
 768 st_api_destroy(struct st_api *stapi)
 769 {
 770 }
 771
 772 /**
 773  * Flush the front buffer if the current context renders to the front buffer.
 774  */
 775 void
 776 st_manager_flush_frontbuffer(struct st_context *st)
 777 {
 778    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 779    struct st_renderbuffer *strb = NULL;
 780
 781    if (stfb)
 782       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 783    if (!strb)
 784       return;
 785
 786    /* never a dummy fb */
 787    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 788    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 789 }
 790
 791 /**
 792  * Return the surface of an EGLImage.
 793  * FIXME: I think this should operate on resources, not surfaces
 794  */
 795 struct pipe_surface *
 796 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 797 {
 798    struct st_manager *smapi =
 799       (struct st_manager *) st->iface.st_context_private;
 800    struct st_egl_image stimg;
 801    struct pipe_surface *ps, surf_tmpl;
 802
 803    if (!smapi || !smapi->get_egl_image)
 804       return NULL;
 805
 806    memset(&stimg, 0, sizeof(stimg));
 807    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 808       return NULL;
 809
 810    u_surface_default_template(&surf_tmpl, stimg.texture);
 811    surf_tmpl.u.tex.level = stimg.level;
 812    surf_tmpl.u.tex.first_layer = stimg.layer;
 813    surf_tmpl.u.tex.last_layer = stimg.layer;
 814    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 815    pipe_resource_reference(&stimg.texture, NULL);
 816
 817    return ps;
 818 }
 819
 820 /**
 821  * Re-validate the framebuffers.
 822  */
 823 void
 824 st_manager_validate_framebuffers(struct st_context *st)
 825 {
 826    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 827    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 828
 829    if (stdraw)
 830       st_framebuffer_validate(stdraw, st);
 831    if (stread && stread != stdraw)
 832       st_framebuffer_validate(stread, st);
 833
 834    st_context_validate(st, stdraw, stread);
 835 }
 836
 837 /**
 838  * Add a color renderbuffer on demand.
 839  */
 840 boolean
 841 st_manager_add_color_renderbuffer(struct st_context *st,
 842                                   struct gl_framebuffer *fb,
 843                                   gl_buffer_index idx)
 844 {
 845    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 846
 847    /* FBO */
 848    if (!stfb)
 849       return FALSE;
 850
 851    if (stfb->Base.Attachment[idx].Renderbuffer)
 852       return TRUE;
 853
 854    switch (idx) {
 855    case BUFFER_FRONT_LEFT:
 856    case BUFFER_BACK_LEFT:
 857    case BUFFER_FRONT_RIGHT:
 858    case BUFFER_BACK_RIGHT:
 859       break;
 860    default:
 861       return FALSE;
 862       break;
 863    }
 864
 865    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 866       return FALSE;
 867
 868    st_framebuffer_update_attachments(stfb);
 869
 870    /*
 871     * Force a call to the state tracker manager to validate the
 872     * new renderbuffer. It might be that there is a window system
 873     * renderbuffer available.
 874     */
 875    if(stfb->iface)
 876       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 877
 878    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 879
 880    return TRUE;
 881 }
 882
 883 static const struct st_api st_gl_api = {
 884    "Mesa " PACKAGE_VERSION,
 885    ST_API_OPENGL,
 886    ST_PROFILE_DEFAULT_MASK |
 887    ST_PROFILE_OPENGL_CORE_MASK |
 888    ST_PROFILE_OPENGL_ES1_MASK |
 889    ST_PROFILE_OPENGL_ES2_MASK |
 890    0,
 891    ST_API_FEATURE_MS_VISUALS_MASK,
 892    st_api_destroy,
 893    st_api_get_proc_address,
 894    st_api_create_context,
 895    st_api_make_current,
 896    st_api_get_current,
 897 };
 898
 899 struct st_api *
 900 st_gl_api_create(void)
 901 {
 902    return (struct st_api *) &st_gl_api;
 903 }