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 "state_tracker/st_gl_api.h"
  30
  31 #include "pipe/p_context.h"
  32 #include "pipe/p_screen.h"
  33 #include "util/u_format.h"
  34 #include "util/u_pointer.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_atomic.h"
  37 #include "util/u_surface.h"
  38
  39 #include "main/mtypes.h"
  40 #include "main/context.h"
  41 #include "main/mfeatures.h"
  42 #include "main/texobj.h"
  43 #include "main/teximage.h"
  44 #include "main/texstate.h"
  45 #include "main/framebuffer.h"
  46 #include "main/fbobject.h"
  47 #include "main/renderbuffer.h"
  48 #include "main/version.h"
  49 #include "st_texture.h"
  50
  51 #include "st_context.h"
  52 #include "st_format.h"
  53 #include "st_cb_fbo.h"
  54 #include "st_cb_flush.h"
  55 #include "st_manager.h"
  56
  57 /**
  58  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  59  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  60  * We'll only return non-null for window system framebuffers.
  61  * Note that this function may fail.
  62  */
  63 static INLINE struct st_framebuffer *
  64 st_ws_framebuffer(struct gl_framebuffer *fb)
  65 {
  66    /* FBO cannot be casted.  See st_new_framebuffer */
  67    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  68 }
  69
  70 /**
  71  * Map an attachment to a buffer index.
  72  */
  73 static INLINE gl_buffer_index
  74 attachment_to_buffer_index(enum st_attachment_type statt)
  75 {
  76    gl_buffer_index index;
  77
  78    switch (statt) {
  79    case ST_ATTACHMENT_FRONT_LEFT:
  80       index = BUFFER_FRONT_LEFT;
  81       break;
  82    case ST_ATTACHMENT_BACK_LEFT:
  83       index = BUFFER_BACK_LEFT;
  84       break;
  85    case ST_ATTACHMENT_FRONT_RIGHT:
  86       index = BUFFER_FRONT_RIGHT;
  87       break;
  88    case ST_ATTACHMENT_BACK_RIGHT:
  89       index = BUFFER_BACK_RIGHT;
  90       break;
  91    case ST_ATTACHMENT_DEPTH_STENCIL:
  92       index = BUFFER_DEPTH;
  93       break;
  94    case ST_ATTACHMENT_ACCUM:
  95       index = BUFFER_ACCUM;
  96       break;
  97    case ST_ATTACHMENT_SAMPLE:
  98    default:
  99       index = BUFFER_COUNT;
 100       break;
 101    }
 102
 103    return index;
 104 }
 105
 106 /**
 107  * Map a buffer index to an attachment.
 108  */
 109 static INLINE enum st_attachment_type
 110 buffer_index_to_attachment(gl_buffer_index index)
 111 {
 112    enum st_attachment_type statt;
 113
 114    switch (index) {
 115    case BUFFER_FRONT_LEFT:
 116       statt = ST_ATTACHMENT_FRONT_LEFT;
 117       break;
 118    case BUFFER_BACK_LEFT:
 119       statt = ST_ATTACHMENT_BACK_LEFT;
 120       break;
 121    case BUFFER_FRONT_RIGHT:
 122       statt = ST_ATTACHMENT_FRONT_RIGHT;
 123       break;
 124    case BUFFER_BACK_RIGHT:
 125       statt = ST_ATTACHMENT_BACK_RIGHT;
 126       break;
 127    case BUFFER_DEPTH:
 128       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 129       break;
 130    case BUFFER_ACCUM:
 131       statt = ST_ATTACHMENT_ACCUM;
 132       break;
 133    default:
 134       statt = ST_ATTACHMENT_INVALID;
 135       break;
 136    }
 137
 138    return statt;
 139 }
 140
 141 /**
 142  * Make sure a context picks up the latest cached state of the
 143  * drawables it binds to.
 144  */
 145 static void
 146 st_context_validate(struct st_context *st,
 147                     struct st_framebuffer *stdraw,
 148                     struct st_framebuffer *stread)
 149 {
 150     if (stdraw && stdraw->stamp != st->draw_stamp) {
 151        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 152        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 153                                 stdraw->Base.Width,
 154                                 stdraw->Base.Height);
 155        st->draw_stamp = stdraw->stamp;
 156     }
 157
 158     if (stread && stread->stamp != st->read_stamp) {
 159        if (stread != stdraw) {
 160           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 161           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 162                                    stread->Base.Width,
 163                                    stread->Base.Height);
 164        }
 165        st->read_stamp = stread->stamp;
 166     }
 167 }
 168
 169 /**
 170  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 171  * The context we need to pass in is s dummy context needed only to be
 172  * able to get a pipe context to create pipe surfaces, and to have a
 173  * context to call _mesa_resize_framebuffer():
 174  * (That should probably be rethought, since those surfaces become
 175  * drawable state, not context state, and can be freed by another pipe
 176  * context).
 177  */
 178 static void
 179 st_framebuffer_validate(struct st_framebuffer *stfb,
 180                         struct st_context *st)
 181 {
 182    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 183    uint width, height;
 184    unsigned i;
 185    boolean changed = FALSE;
 186    int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);
 187
 188    if (stfb->iface_stamp == new_stamp)
 189       return;
 190
 191    /* validate the fb */
 192    do {
 193       if (!stfb->iface->validate(stfb->iface, stfb->statts,
 194                                  stfb->num_statts, textures))
 195          return;
 196
 197       stfb->iface_stamp = new_stamp;
 198       new_stamp = p_atomic_read(&stfb->iface->stamp);
 199    } while(stfb->iface_stamp != new_stamp);
 200
 201    width = stfb->Base.Width;
 202    height = stfb->Base.Height;
 203
 204    for (i = 0; i < stfb->num_statts; i++) {
 205       struct st_renderbuffer *strb;
 206       struct pipe_surface *ps, surf_tmpl;
 207       gl_buffer_index idx;
 208
 209       if (!textures[i])
 210          continue;
 211
 212       idx = attachment_to_buffer_index(stfb->statts[i]);
 213       if (idx >= BUFFER_COUNT) {
 214          pipe_resource_reference(&textures[i], NULL);
 215          continue;
 216       }
 217
 218       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 219       assert(strb);
 220       if (strb->texture == textures[i]) {
 221          pipe_resource_reference(&textures[i], NULL);
 222          continue;
 223       }
 224
 225       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 226       u_surface_default_template(&surf_tmpl, textures[i],
 227                                  PIPE_BIND_RENDER_TARGET);
 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    int samples;
 288    boolean sw;
 289
 290    if (!stfb->iface)
 291       return FALSE;
 292
 293    /* do not distinguish depth/stencil buffers */
 294    if (idx == BUFFER_STENCIL)
 295       idx = BUFFER_DEPTH;
 296
 297    switch (idx) {
 298    case BUFFER_DEPTH:
 299       format = stfb->iface->visual->depth_stencil_format;
 300       sw = FALSE;
 301       break;
 302    case BUFFER_ACCUM:
 303       format = stfb->iface->visual->accum_format;
 304       sw = TRUE;
 305       break;
 306    default:
 307       format = stfb->iface->visual->color_format;
 308       sw = FALSE;
 309       break;
 310    }
 311
 312    if (format == PIPE_FORMAT_NONE)
 313       return FALSE;
 314
 315    samples = stfb->iface->visual->samples;
 316    if (!samples)
 317       samples = st_get_msaa();
 318
 319    rb = st_new_renderbuffer_fb(format, samples, sw);
 320    if (!rb)
 321       return FALSE;
 322
 323    if (idx != BUFFER_DEPTH) {
 324       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 325    }
 326    else {
 327       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 328          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 329       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 330          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 331    }
 332
 333    return TRUE;
 334 }
 335
 336 /**
 337  * Intialize a struct gl_config from a visual.
 338  */
 339 static void
 340 st_visual_to_context_mode(const struct st_visual *visual,
 341                           struct gl_config *mode)
 342 {
 343    memset(mode, 0, sizeof(*mode));
 344
 345    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 346       mode->doubleBufferMode = GL_TRUE;
 347    if (st_visual_have_buffers(visual,
 348             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 349       mode->stereoMode = GL_TRUE;
 350
 351    if (visual->color_format != PIPE_FORMAT_NONE) {
 352       mode->rgbMode = GL_TRUE;
 353
 354       mode->redBits =
 355          util_format_get_component_bits(visual->color_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 0);
 357       mode->greenBits =
 358          util_format_get_component_bits(visual->color_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 1);
 360       mode->blueBits =
 361          util_format_get_component_bits(visual->color_format,
 362                UTIL_FORMAT_COLORSPACE_RGB, 2);
 363       mode->alphaBits =
 364          util_format_get_component_bits(visual->color_format,
 365                UTIL_FORMAT_COLORSPACE_RGB, 3);
 366
 367       mode->rgbBits = mode->redBits +
 368          mode->greenBits + mode->blueBits + mode->alphaBits;
 369    }
 370
 371    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 372       mode->depthBits =
 373          util_format_get_component_bits(visual->depth_stencil_format,
 374                UTIL_FORMAT_COLORSPACE_ZS, 0);
 375       mode->stencilBits =
 376          util_format_get_component_bits(visual->depth_stencil_format,
 377                UTIL_FORMAT_COLORSPACE_ZS, 1);
 378
 379       mode->haveDepthBuffer = mode->depthBits > 0;
 380       mode->haveStencilBuffer = mode->stencilBits > 0;
 381    }
 382
 383    if (visual->accum_format != PIPE_FORMAT_NONE) {
 384       mode->haveAccumBuffer = GL_TRUE;
 385
 386       mode->accumRedBits =
 387          util_format_get_component_bits(visual->accum_format,
 388                UTIL_FORMAT_COLORSPACE_RGB, 0);
 389       mode->accumGreenBits =
 390          util_format_get_component_bits(visual->accum_format,
 391                UTIL_FORMAT_COLORSPACE_RGB, 1);
 392       mode->accumBlueBits =
 393          util_format_get_component_bits(visual->accum_format,
 394                UTIL_FORMAT_COLORSPACE_RGB, 2);
 395       mode->accumAlphaBits =
 396          util_format_get_component_bits(visual->accum_format,
 397                UTIL_FORMAT_COLORSPACE_RGB, 3);
 398    }
 399
 400    if (visual->samples) {
 401       mode->sampleBuffers = 1;
 402       mode->samples = visual->samples;
 403    }
 404 }
 405
 406 /**
 407  * Determine the default draw or read buffer from a visual.
 408  */
 409 static void
 410 st_visual_to_default_buffer(const struct st_visual *visual,
 411                             GLenum *buffer, GLint *index)
 412 {
 413    enum st_attachment_type statt;
 414    GLenum buf;
 415    gl_buffer_index idx;
 416
 417    statt = visual->render_buffer;
 418    /* do nothing if an invalid render buffer is specified */
 419    if (statt == ST_ATTACHMENT_INVALID ||
 420        !st_visual_have_buffers(visual, 1 << statt))
 421       return;
 422
 423    switch (statt) {
 424    case ST_ATTACHMENT_FRONT_LEFT:
 425       buf = GL_FRONT_LEFT;
 426       idx = BUFFER_FRONT_LEFT;
 427       break;
 428    case ST_ATTACHMENT_BACK_LEFT:
 429       buf = GL_BACK_LEFT;
 430       idx = BUFFER_BACK_LEFT;
 431       break;
 432    case ST_ATTACHMENT_FRONT_RIGHT:
 433       buf = GL_FRONT_RIGHT;
 434       idx = BUFFER_FRONT_RIGHT;
 435       break;
 436    case ST_ATTACHMENT_BACK_RIGHT:
 437       buf = GL_BACK_RIGHT;
 438       idx = BUFFER_BACK_RIGHT;
 439       break;
 440    default:
 441       buf = GL_NONE;
 442       idx = BUFFER_COUNT;
 443       break;
 444    }
 445
 446    if (buf != GL_NONE) {
 447       if (buffer)
 448          *buffer = buf;
 449       if (index)
 450          *index = idx;
 451    }
 452 }
 453
 454 /**
 455  * Create a framebuffer from a manager interface.
 456  */
 457 static struct st_framebuffer *
 458 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 459 {
 460    struct st_framebuffer *stfb;
 461    struct gl_config mode;
 462    gl_buffer_index idx;
 463
 464    if (!stfbi)
 465       return NULL;
 466
 467    stfb = CALLOC_STRUCT(st_framebuffer);
 468    if (!stfb)
 469       return NULL;
 470
 471    st_visual_to_context_mode(stfbi->visual, &mode);
 472    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 473
 474    /* modify the draw/read buffers of the fb */
 475    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 476          &stfb->Base._ColorDrawBufferIndexes[0]);
 477    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 478          &stfb->Base._ColorReadBufferIndex);
 479
 480    stfb->iface = stfbi;
 481    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 482
 483    /* add the color buffer */
 484    idx = stfb->Base._ColorDrawBufferIndexes[0];
 485    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 486       FREE(stfb);
 487       return NULL;
 488    }
 489
 490    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 491    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 492
 493    stfb->stamp = 0;
 494    st_framebuffer_update_attachments(stfb);
 495
 496    stfb->Base.Initialized = GL_TRUE;
 497
 498    return stfb;
 499 }
 500
 501 /**
 502  * Reference a framebuffer.
 503  */
 504 static void
 505 st_framebuffer_reference(struct st_framebuffer **ptr,
 506                          struct st_framebuffer *stfb)
 507 {
 508    struct gl_framebuffer *fb = &stfb->Base;
 509    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 510 }
 511
 512 static void
 513 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 514                  struct pipe_fence_handle **fence)
 515 {
 516    struct st_context *st = (struct st_context *) stctxi;
 517    st_flush(st, fence);
 518    if (flags & ST_FLUSH_FRONT)
 519       st_manager_flush_frontbuffer(st);
 520 }
 521
 522 static boolean
 523 st_context_teximage(struct st_context_iface *stctxi,
 524                     enum st_texture_type target,
 525                     int level, enum pipe_format internal_format,
 526                     struct pipe_resource *tex, boolean mipmap)
 527 {
 528    struct st_context *st = (struct st_context *) stctxi;
 529    struct gl_context *ctx = st->ctx;
 530    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 531    struct gl_texture_object *texObj;
 532    struct gl_texture_image *texImage;
 533    struct st_texture_object *stObj;
 534    struct st_texture_image *stImage;
 535    GLenum internalFormat;
 536    GLuint width, height, depth;
 537
 538    switch (target) {
 539    case ST_TEXTURE_1D:
 540       target = GL_TEXTURE_1D;
 541       break;
 542    case ST_TEXTURE_2D:
 543       target = GL_TEXTURE_2D;
 544       break;
 545    case ST_TEXTURE_3D:
 546       target = GL_TEXTURE_3D;
 547       break;
 548    case ST_TEXTURE_RECT:
 549       target = GL_TEXTURE_RECTANGLE_ARB;
 550       break;
 551    default:
 552       return FALSE;
 553       break;
 554    }
 555
 556    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 557    _mesa_lock_texture(ctx, texObj);
 558
 559    stObj = st_texture_object(texObj);
 560    /* switch to surface based */
 561    if (!stObj->surface_based) {
 562       _mesa_clear_texture_object(ctx, texObj);
 563       stObj->surface_based = GL_TRUE;
 564    }
 565
 566    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 567    stImage = st_texture_image(texImage);
 568    if (tex) {
 569       gl_format texFormat;
 570
 571       /*
 572        * XXX When internal_format and tex->format differ, st_finalize_texture
 573        * needs to allocate a new texture with internal_format and copy the
 574        * texture here into the new one.  It will result in surface_copy being
 575        * called on surfaces whose formats differ.
 576        *
 577        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 578        * is to use a sampler view.
 579        */
 580       if (!st_sampler_compat_formats(tex->format, internal_format))
 581          internal_format = tex->format;
 582
 583       if (util_format_get_component_bits(internal_format,
 584                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 585          internalFormat = GL_RGBA;
 586       else
 587          internalFormat = GL_RGB;
 588
 589       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 590                                          GL_RGBA, GL_UNSIGNED_BYTE);
 591
 592       _mesa_init_teximage_fields(ctx, target, texImage,
 593                                  tex->width0, tex->height0, 1, 0,
 594                                  internalFormat, texFormat);
 595
 596       width = tex->width0;
 597       height = tex->height0;
 598       depth = tex->depth0;
 599
 600       /* grow the image size until we hit level = 0 */
 601       while (level > 0) {
 602          if (width != 1)
 603             width <<= 1;
 604          if (height != 1)
 605             height <<= 1;
 606          if (depth != 1)
 607             depth <<= 1;
 608          level--;
 609       }
 610    }
 611    else {
 612       _mesa_clear_texture_image(ctx, texImage);
 613       width = height = depth = 0;
 614    }
 615
 616    pipe_resource_reference(&stImage->pt, tex);
 617    stObj->width0 = width;
 618    stObj->height0 = height;
 619    stObj->depth0 = depth;
 620
 621    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 622    _mesa_unlock_texture(ctx, texObj);
 623
 624    return TRUE;
 625 }
 626
 627 static void
 628 st_context_copy(struct st_context_iface *stctxi,
 629                 struct st_context_iface *stsrci, unsigned mask)
 630 {
 631    struct st_context *st = (struct st_context *) stctxi;
 632    struct st_context *src = (struct st_context *) stsrci;
 633
 634    _mesa_copy_context(src->ctx, st->ctx, mask);
 635 }
 636
 637 static boolean
 638 st_context_share(struct st_context_iface *stctxi,
 639                  struct st_context_iface *stsrci)
 640 {
 641    struct st_context *st = (struct st_context *) stctxi;
 642    struct st_context *src = (struct st_context *) stsrci;
 643
 644    return _mesa_share_state(st->ctx, src->ctx);
 645 }
 646
 647 static void
 648 st_context_destroy(struct st_context_iface *stctxi)
 649 {
 650    struct st_context *st = (struct st_context *) stctxi;
 651    st_destroy_context(st);
 652 }
 653
 654 static struct st_context_iface *
 655 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 656                       const struct st_context_attribs *attribs,
 657                       struct st_context_iface *shared_stctxi)
 658 {
 659    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 660    struct st_context *st;
 661    struct pipe_context *pipe;
 662    struct gl_config mode;
 663    gl_api api;
 664
 665    if (!(stapi->profile_mask & (1 << attribs->profile)))
 666       return NULL;
 667
 668    switch (attribs->profile) {
 669    case ST_PROFILE_DEFAULT:
 670       api = API_OPENGL;
 671       break;
 672    case ST_PROFILE_OPENGL_ES1:
 673       api = API_OPENGLES;
 674       break;
 675    case ST_PROFILE_OPENGL_ES2:
 676       api = API_OPENGLES2;
 677       break;
 678    case ST_PROFILE_OPENGL_CORE:
 679    default:
 680       return NULL;
 681       break;
 682    }
 683
 684    pipe = smapi->screen->context_create(smapi->screen, NULL);
 685    if (!pipe)
 686       return NULL;
 687
 688    st_visual_to_context_mode(&attribs->visual, &mode);
 689    st = st_create_context(api, pipe, &mode, shared_ctx);
 690    if (!st) {
 691       pipe->destroy(pipe);
 692       return NULL;
 693    }
 694
 695    /* need to perform version check */
 696    if (attribs->major > 1 || attribs->minor > 0) {
 697       _mesa_compute_version(st->ctx);
 698
 699       /* is the actual version less than the requested version? */
 700       if (st->ctx->VersionMajor * 10 + st->ctx->VersionMinor <
 701           attribs->major * 10 + attribs->minor) {
 702          st_destroy_context(st);
 703          return NULL;
 704       }
 705    }
 706
 707    st->invalidate_on_gl_viewport =
 708       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 709
 710    st->iface.destroy = st_context_destroy;
 711    st->iface.flush = st_context_flush;
 712    st->iface.teximage = st_context_teximage;
 713    st->iface.copy = st_context_copy;
 714    st->iface.share = st_context_share;
 715    st->iface.st_context_private = (void *) smapi;
 716
 717    return &st->iface;
 718 }
 719
 720 static struct st_context_iface *
 721 st_api_get_current(struct st_api *stapi)
 722 {
 723    GET_CURRENT_CONTEXT(ctx);
 724    struct st_context *st = (ctx) ? ctx->st : NULL;
 725
 726    return (st) ? &st->iface : NULL;
 727 }
 728
 729 static struct st_framebuffer *
 730 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 731                                struct st_framebuffer_iface *stfbi)
 732 {
 733    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 734
 735    if (cur && cur->iface == stfbi) {
 736       /* reuse the current stfb */
 737       st_framebuffer_reference(&stfb, cur);
 738    }
 739    else {
 740       /* create a new one */
 741       stfb = st_framebuffer_create(stfbi);
 742    }
 743
 744    return stfb;
 745 }
 746
 747 static boolean
 748 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 749                     struct st_framebuffer_iface *stdrawi,
 750                     struct st_framebuffer_iface *streadi)
 751 {
 752    struct st_context *st = (struct st_context *) stctxi;
 753    struct st_framebuffer *stdraw, *stread;
 754    boolean ret;
 755
 756    _glapi_check_multithread();
 757
 758    if (st) {
 759       /* reuse or create the draw fb */
 760       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 761                                               stdrawi);
 762       if (streadi != stdrawi) {
 763          /* do the same for the read fb */
 764          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 765                                                  streadi);
 766       }
 767       else {
 768          stread = NULL;
 769          /* reuse the draw fb for the read fb */
 770          if (stdraw)
 771             st_framebuffer_reference(&stread, stdraw);
 772       }
 773
 774       if (stdraw && stread) {
 775          st_framebuffer_validate(stdraw, st);
 776          if (stread != stdraw)
 777             st_framebuffer_validate(stread, st);
 778
 779          /* modify the draw/read buffers of the context */
 780          if (stdraw->iface) {
 781             st_visual_to_default_buffer(stdraw->iface->visual,
 782                   &st->ctx->Color.DrawBuffer[0], NULL);
 783          }
 784          if (stread->iface) {
 785             st_visual_to_default_buffer(stread->iface->visual,
 786                   &st->ctx->Pixel.ReadBuffer, NULL);
 787          }
 788
 789          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 790
 791          st->draw_stamp = stdraw->stamp - 1;
 792          st->read_stamp = stread->stamp - 1;
 793          st_context_validate(st, stdraw, stread);
 794       }
 795       else {
 796          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 797          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 798       }
 799
 800       st_framebuffer_reference(&stdraw, NULL);
 801       st_framebuffer_reference(&stread, NULL);
 802    }
 803    else {
 804       ret = _mesa_make_current(NULL, NULL, NULL);
 805    }
 806
 807    return ret;
 808 }
 809
 810 static st_proc_t
 811 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 812 {
 813    return (st_proc_t) _glapi_get_proc_address(procname);
 814 }
 815
 816 static void
 817 st_api_destroy(struct st_api *stapi)
 818 {
 819 }
 820
 821 /**
 822  * Flush the front buffer if the current context renders to the front buffer.
 823  */
 824 void
 825 st_manager_flush_frontbuffer(struct st_context *st)
 826 {
 827    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 828    struct st_renderbuffer *strb = NULL;
 829
 830    if (stfb)
 831       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 832    if (!strb)
 833       return;
 834
 835    /* never a dummy fb */
 836    assert(stfb->iface);
 837    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 838 }
 839
 840 /**
 841  * Return the surface of an EGLImage.
 842  * FIXME: I think this should operate on resources, not surfaces
 843  */
 844 struct pipe_surface *
 845 st_manager_get_egl_image_surface(struct st_context *st,
 846                                  void *eglimg, unsigned usage)
 847 {
 848    struct st_manager *smapi =
 849       (struct st_manager *) st->iface.st_context_private;
 850    struct st_egl_image stimg;
 851    struct pipe_surface *ps, surf_tmpl;
 852
 853    if (!smapi || !smapi->get_egl_image)
 854       return NULL;
 855
 856    memset(&stimg, 0, sizeof(stimg));
 857    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 858       return NULL;
 859
 860    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 861    surf_tmpl.format = stimg.texture->format;
 862    surf_tmpl.usage = usage;
 863    surf_tmpl.u.tex.level = stimg.level;
 864    surf_tmpl.u.tex.first_layer = stimg.layer;
 865    surf_tmpl.u.tex.last_layer = stimg.layer;
 866    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 867    pipe_resource_reference(&stimg.texture, NULL);
 868
 869    return ps;
 870 }
 871
 872 /**
 873  * Re-validate the framebuffers.
 874  */
 875 void
 876 st_manager_validate_framebuffers(struct st_context *st)
 877 {
 878    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 879    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 880
 881    if (stdraw)
 882       st_framebuffer_validate(stdraw, st);
 883    if (stread && stread != stdraw)
 884       st_framebuffer_validate(stread, st);
 885
 886    st_context_validate(st, stdraw, stread);
 887 }
 888
 889 /**
 890  * Add a color renderbuffer on demand.
 891  */
 892 boolean
 893 st_manager_add_color_renderbuffer(struct st_context *st,
 894                                   struct gl_framebuffer *fb,
 895                                   gl_buffer_index idx)
 896 {
 897    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 898
 899    /* FBO */
 900    if (!stfb)
 901       return FALSE;
 902
 903    if (stfb->Base.Attachment[idx].Renderbuffer)
 904       return TRUE;
 905
 906    switch (idx) {
 907    case BUFFER_FRONT_LEFT:
 908    case BUFFER_BACK_LEFT:
 909    case BUFFER_FRONT_RIGHT:
 910    case BUFFER_BACK_RIGHT:
 911       break;
 912    default:
 913       return FALSE;
 914       break;
 915    }
 916
 917    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 918       return FALSE;
 919
 920    st_framebuffer_update_attachments(stfb);
 921    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 922
 923    return TRUE;
 924 }
 925
 926 static const struct st_api st_gl_api = {
 927    "Mesa " MESA_VERSION_STRING,
 928    ST_API_OPENGL,
 929 #if FEATURE_GL
 930    ST_PROFILE_DEFAULT_MASK |
 931 #endif
 932 #if FEATURE_ES1
 933    ST_PROFILE_OPENGL_ES1_MASK |
 934 #endif
 935 #if FEATURE_ES2
 936    ST_PROFILE_OPENGL_ES2_MASK |
 937 #endif
 938    0,
 939    st_api_destroy,
 940    st_api_get_proc_address,
 941    st_api_create_context,
 942    st_api_make_current,
 943    st_api_get_current,
 944 };
 945
 946 struct st_api *
 947 st_gl_api_create(void)
 948 {
 949    return (struct st_api *) &st_gl_api;
 950 }