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
  38 #include "main/mtypes.h"
  39 #include "main/context.h"
  40 #include "main/texobj.h"
  41 #include "main/teximage.h"
  42 #include "main/texstate.h"
  43 #include "main/framebuffer.h"
  44 #include "main/fbobject.h"
  45 #include "main/renderbuffer.h"
  46 #include "main/version.h"
  47 #include "st_texture.h"
  48
  49 #include "st_context.h"
  50 #include "st_format.h"
  51 #include "st_cb_fbo.h"
  52 #include "st_cb_flush.h"
  53 #include "st_manager.h"
  54
  55 /**
  56  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  57  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  58  * We'll only return non-null for window system framebuffers.
  59  * Note that this function may fail.
  60  */
  61 static INLINE struct st_framebuffer *
  62 st_ws_framebuffer(struct gl_framebuffer *fb)
  63 {
  64    /* FBO cannot be casted.  See st_new_framebuffer */
  65    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  66 }
  67
  68 /**
  69  * Map an attachment to a buffer index.
  70  */
  71 static INLINE gl_buffer_index
  72 attachment_to_buffer_index(enum st_attachment_type statt)
  73 {
  74    gl_buffer_index index;
  75
  76    switch (statt) {
  77    case ST_ATTACHMENT_FRONT_LEFT:
  78       index = BUFFER_FRONT_LEFT;
  79       break;
  80    case ST_ATTACHMENT_BACK_LEFT:
  81       index = BUFFER_BACK_LEFT;
  82       break;
  83    case ST_ATTACHMENT_FRONT_RIGHT:
  84       index = BUFFER_FRONT_RIGHT;
  85       break;
  86    case ST_ATTACHMENT_BACK_RIGHT:
  87       index = BUFFER_BACK_RIGHT;
  88       break;
  89    case ST_ATTACHMENT_DEPTH_STENCIL:
  90       index = BUFFER_DEPTH;
  91       break;
  92    case ST_ATTACHMENT_ACCUM:
  93       index = BUFFER_ACCUM;
  94       break;
  95    case ST_ATTACHMENT_SAMPLE:
  96    default:
  97       index = BUFFER_COUNT;
  98       break;
  99    }
 100
 101    return index;
 102 }
 103
 104 /**
 105  * Map a buffer index to an attachment.
 106  */
 107 static INLINE enum st_attachment_type
 108 buffer_index_to_attachment(gl_buffer_index index)
 109 {
 110    enum st_attachment_type statt;
 111
 112    switch (index) {
 113    case BUFFER_FRONT_LEFT:
 114       statt = ST_ATTACHMENT_FRONT_LEFT;
 115       break;
 116    case BUFFER_BACK_LEFT:
 117       statt = ST_ATTACHMENT_BACK_LEFT;
 118       break;
 119    case BUFFER_FRONT_RIGHT:
 120       statt = ST_ATTACHMENT_FRONT_RIGHT;
 121       break;
 122    case BUFFER_BACK_RIGHT:
 123       statt = ST_ATTACHMENT_BACK_RIGHT;
 124       break;
 125    case BUFFER_DEPTH:
 126       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 127       break;
 128    case BUFFER_ACCUM:
 129       statt = ST_ATTACHMENT_ACCUM;
 130       break;
 131    default:
 132       statt = ST_ATTACHMENT_INVALID;
 133       break;
 134    }
 135
 136    return statt;
 137 }
 138
 139 /**
 140  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 141  */
 142 static void
 143 st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
 144 {
 145    struct pipe_screen *screen = st->pipe->screen;
 146    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 147    uint width, height;
 148    unsigned i;
 149    boolean changed = FALSE;
 150
 151    if (!p_atomic_read(&stfb->revalidate))
 152       return;
 153
 154    /* validate the fb */
 155    if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
 156       return;
 157
 158    width = stfb->Base.Width;
 159    height = stfb->Base.Height;
 160
 161    for (i = 0; i < stfb->num_statts; i++) {
 162       struct st_renderbuffer *strb;
 163       struct pipe_surface *ps;
 164       gl_buffer_index idx;
 165
 166       if (!textures[i])
 167          continue;
 168
 169       idx = attachment_to_buffer_index(stfb->statts[i]);
 170       if (idx >= BUFFER_COUNT) {
 171          pipe_resource_reference(&textures[i], NULL);
 172          continue;
 173       }
 174
 175       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 176       assert(strb);
 177       if (strb->texture == textures[i]) {
 178          pipe_resource_reference(&textures[i], NULL);
 179          continue;
 180       }
 181
 182       ps = screen->get_tex_surface(screen, textures[i], 0, 0, 0,
 183                                    PIPE_BIND_RENDER_TARGET);
 184       if (ps) {
 185          pipe_surface_reference(&strb->surface, ps);
 186          pipe_resource_reference(&strb->texture, ps->texture);
 187          /* ownership transfered */
 188          pipe_surface_reference(&ps, NULL);
 189
 190          changed = TRUE;
 191
 192          strb->Base.Width = strb->surface->width;
 193          strb->Base.Height = strb->surface->height;
 194
 195          width = strb->Base.Width;
 196          height = strb->Base.Height;
 197       }
 198
 199       pipe_resource_reference(&textures[i], NULL);
 200    }
 201
 202    if (changed) {
 203       st->dirty.st |= ST_NEW_FRAMEBUFFER;
 204       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 205
 206       assert(stfb->Base.Width == width);
 207       assert(stfb->Base.Height == height);
 208    }
 209
 210    p_atomic_set(&stfb->revalidate, FALSE);
 211 }
 212
 213 /**
 214  * Update the attachments to validate by looping the existing renderbuffers.
 215  */
 216 static void
 217 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 218 {
 219    gl_buffer_index idx;
 220
 221    stfb->num_statts = 0;
 222    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 223       struct st_renderbuffer *strb;
 224       enum st_attachment_type statt;
 225
 226       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 227       if (!strb || strb->software)
 228          continue;
 229
 230       statt = buffer_index_to_attachment(idx);
 231       if (statt != ST_ATTACHMENT_INVALID &&
 232           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 233          stfb->statts[stfb->num_statts++] = statt;
 234    }
 235
 236    p_atomic_set(&stfb->revalidate, TRUE);
 237 }
 238
 239 /**
 240  * Add a renderbuffer to the framebuffer.
 241  */
 242 static boolean
 243 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 244                                 gl_buffer_index idx)
 245 {
 246    struct gl_renderbuffer *rb;
 247    enum pipe_format format;
 248    int samples;
 249    boolean sw;
 250
 251    if (!stfb->iface)
 252       return FALSE;
 253
 254    /* do not distinguish depth/stencil buffers */
 255    if (idx == BUFFER_STENCIL)
 256       idx = BUFFER_DEPTH;
 257
 258    switch (idx) {
 259    case BUFFER_DEPTH:
 260       format = stfb->iface->visual->depth_stencil_format;
 261       sw = FALSE;
 262       break;
 263    case BUFFER_ACCUM:
 264       format = stfb->iface->visual->accum_format;
 265       sw = TRUE;
 266       break;
 267    default:
 268       format = stfb->iface->visual->color_format;
 269       sw = FALSE;
 270       break;
 271    }
 272
 273    if (format == PIPE_FORMAT_NONE)
 274       return FALSE;
 275
 276    samples = stfb->iface->visual->samples;
 277    if (!samples)
 278       samples = st_get_msaa();
 279
 280    rb = st_new_renderbuffer_fb(format, samples, sw);
 281    if (!rb)
 282       return FALSE;
 283
 284    if (idx != BUFFER_DEPTH) {
 285       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 286    }
 287    else {
 288       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 289          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 290       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 291          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 292    }
 293
 294    return TRUE;
 295 }
 296
 297 /**
 298  * Intialize a struct gl_config from a visual.
 299  */
 300 static void
 301 st_visual_to_context_mode(const struct st_visual *visual,
 302                           struct gl_config *mode)
 303 {
 304    memset(mode, 0, sizeof(*mode));
 305
 306    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 307       mode->doubleBufferMode = GL_TRUE;
 308    if (st_visual_have_buffers(visual,
 309             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 310       mode->stereoMode = GL_TRUE;
 311
 312    if (visual->color_format != PIPE_FORMAT_NONE) {
 313       mode->rgbMode = GL_TRUE;
 314
 315       mode->redBits =
 316          util_format_get_component_bits(visual->color_format,
 317                UTIL_FORMAT_COLORSPACE_RGB, 0);
 318       mode->greenBits =
 319          util_format_get_component_bits(visual->color_format,
 320                UTIL_FORMAT_COLORSPACE_RGB, 1);
 321       mode->blueBits =
 322          util_format_get_component_bits(visual->color_format,
 323                UTIL_FORMAT_COLORSPACE_RGB, 2);
 324       mode->alphaBits =
 325          util_format_get_component_bits(visual->color_format,
 326                UTIL_FORMAT_COLORSPACE_RGB, 3);
 327
 328       mode->rgbBits = mode->redBits +
 329          mode->greenBits + mode->blueBits + mode->alphaBits;
 330    }
 331
 332    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 333       mode->depthBits =
 334          util_format_get_component_bits(visual->depth_stencil_format,
 335                UTIL_FORMAT_COLORSPACE_ZS, 0);
 336       mode->stencilBits =
 337          util_format_get_component_bits(visual->depth_stencil_format,
 338                UTIL_FORMAT_COLORSPACE_ZS, 1);
 339
 340       mode->haveDepthBuffer = mode->depthBits > 0;
 341       mode->haveStencilBuffer = mode->stencilBits > 0;
 342    }
 343
 344    if (visual->accum_format != PIPE_FORMAT_NONE) {
 345       mode->haveAccumBuffer = GL_TRUE;
 346
 347       mode->accumRedBits =
 348          util_format_get_component_bits(visual->accum_format,
 349                UTIL_FORMAT_COLORSPACE_RGB, 0);
 350       mode->accumGreenBits =
 351          util_format_get_component_bits(visual->accum_format,
 352                UTIL_FORMAT_COLORSPACE_RGB, 1);
 353       mode->accumBlueBits =
 354          util_format_get_component_bits(visual->accum_format,
 355                UTIL_FORMAT_COLORSPACE_RGB, 2);
 356       mode->accumAlphaBits =
 357          util_format_get_component_bits(visual->accum_format,
 358                UTIL_FORMAT_COLORSPACE_RGB, 3);
 359    }
 360
 361    if (visual->samples) {
 362       mode->sampleBuffers = 1;
 363       mode->samples = visual->samples;
 364    }
 365 }
 366
 367 /**
 368  * Determine the default draw or read buffer from a visual.
 369  */
 370 static void
 371 st_visual_to_default_buffer(const struct st_visual *visual,
 372                             GLenum *buffer, GLint *index)
 373 {
 374    enum st_attachment_type statt;
 375    GLenum buf;
 376    gl_buffer_index idx;
 377
 378    statt = visual->render_buffer;
 379    /* do nothing if an invalid render buffer is specified */
 380    if (statt == ST_ATTACHMENT_INVALID ||
 381        !st_visual_have_buffers(visual, 1 << statt))
 382       return;
 383
 384    switch (statt) {
 385    case ST_ATTACHMENT_FRONT_LEFT:
 386       buf = GL_FRONT_LEFT;
 387       idx = BUFFER_FRONT_LEFT;
 388       break;
 389    case ST_ATTACHMENT_BACK_LEFT:
 390       buf = GL_BACK_LEFT;
 391       idx = BUFFER_BACK_LEFT;
 392       break;
 393    case ST_ATTACHMENT_FRONT_RIGHT:
 394       buf = GL_FRONT_RIGHT;
 395       idx = BUFFER_FRONT_RIGHT;
 396       break;
 397    case ST_ATTACHMENT_BACK_RIGHT:
 398       buf = GL_BACK_RIGHT;
 399       idx = BUFFER_BACK_RIGHT;
 400       break;
 401    default:
 402       buf = GL_NONE;
 403       idx = BUFFER_COUNT;
 404       break;
 405    }
 406
 407    if (buf != GL_NONE) {
 408       if (buffer)
 409          *buffer = buf;
 410       if (index)
 411          *index = idx;
 412    }
 413 }
 414
 415 /**
 416  * Create a framebuffer from a manager interface.
 417  */
 418 static struct st_framebuffer *
 419 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 420 {
 421    struct st_framebuffer *stfb;
 422    struct gl_config mode;
 423    gl_buffer_index idx;
 424
 425    stfb = CALLOC_STRUCT(st_framebuffer);
 426    if (!stfb)
 427       return NULL;
 428
 429    /* for FBO-only context */
 430    if (!stfbi) {
 431       struct gl_framebuffer *base = _mesa_get_incomplete_framebuffer();
 432
 433       stfb->Base = *base;
 434
 435       return stfb;
 436    }
 437
 438    st_visual_to_context_mode(stfbi->visual, &mode);
 439    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 440
 441    /* modify the draw/read buffers of the fb */
 442    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 443          &stfb->Base._ColorDrawBufferIndexes[0]);
 444    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 445          &stfb->Base._ColorReadBufferIndex);
 446
 447    stfb->iface = stfbi;
 448
 449    /* add the color buffer */
 450    idx = stfb->Base._ColorDrawBufferIndexes[0];
 451    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 452       FREE(stfb);
 453       return NULL;
 454    }
 455
 456    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 457    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 458
 459    st_framebuffer_update_attachments(stfb);
 460
 461    stfb->Base.Initialized = GL_TRUE;
 462
 463    return stfb;
 464 }
 465
 466 /**
 467  * Reference a framebuffer.
 468  */
 469 static void
 470 st_framebuffer_reference(struct st_framebuffer **ptr,
 471                          struct st_framebuffer *stfb)
 472 {
 473    struct gl_framebuffer *fb = &stfb->Base;
 474    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 475 }
 476
 477 static void
 478 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 479                                       struct st_framebuffer_iface *stfbi)
 480 {
 481    struct st_context *st = (struct st_context *) stctxi;
 482    struct st_framebuffer *stfb;
 483
 484    /* either draw or read winsys fb */
 485    stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 486    if (!stfb || stfb->iface != stfbi)
 487       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 488
 489    if (stfb && stfb->iface == stfbi) {
 490       p_atomic_set(&stfb->revalidate, TRUE);
 491    }
 492    else {
 493       /* This function is probably getting called when we've detected a
 494        * change in a window's size but the currently bound context is
 495        * not bound to that window.
 496        * If the st_framebuffer_iface structure had a pointer to the
 497        * corresponding st_framebuffer we'd be able to handle this.
 498        */
 499    }
 500 }
 501
 502 static void
 503 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 504                  struct pipe_fence_handle **fence)
 505 {
 506    struct st_context *st = (struct st_context *) stctxi;
 507    st_flush(st, flags, fence);
 508    if (flags & PIPE_FLUSH_RENDER_CACHE)
 509       st_manager_flush_frontbuffer(st);
 510 }
 511
 512 static boolean
 513 st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
 514                     int level, enum pipe_format internal_format,
 515                     struct pipe_resource *tex, boolean mipmap)
 516 {
 517    struct st_context *st = (struct st_context *) stctxi;
 518    struct gl_context *ctx = st->ctx;
 519    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 520    struct gl_texture_object *texObj;
 521    struct gl_texture_image *texImage;
 522    struct st_texture_object *stObj;
 523    struct st_texture_image *stImage;
 524    GLenum internalFormat;
 525    GLuint width, height, depth;
 526
 527    switch (target) {
 528    case ST_TEXTURE_1D:
 529       target = GL_TEXTURE_1D;
 530       break;
 531    case ST_TEXTURE_2D:
 532       target = GL_TEXTURE_2D;
 533       break;
 534    case ST_TEXTURE_3D:
 535       target = GL_TEXTURE_3D;
 536       break;
 537    case ST_TEXTURE_RECT:
 538       target = GL_TEXTURE_RECTANGLE_ARB;
 539       break;
 540    default:
 541       return FALSE;
 542       break;
 543    }
 544
 545    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 546    _mesa_lock_texture(ctx, texObj);
 547
 548    stObj = st_texture_object(texObj);
 549    /* switch to surface based */
 550    if (!stObj->surface_based) {
 551       _mesa_clear_texture_object(ctx, texObj);
 552       stObj->surface_based = GL_TRUE;
 553    }
 554
 555    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 556    stImage = st_texture_image(texImage);
 557    if (tex) {
 558       gl_format texFormat;
 559
 560       /*
 561        * XXX When internal_format and tex->format differ, st_finalize_texture
 562        * needs to allocate a new texture with internal_format and copy the
 563        * texture here into the new one.  It will result in surface_copy being
 564        * called on surfaces whose formats differ.
 565        *
 566        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 567        * is to use a sampler view.
 568        */
 569       if (!st_sampler_compat_formats(tex->format, internal_format))
 570          internal_format = tex->format;
 571
 572       if (util_format_get_component_bits(internal_format,
 573                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 574          internalFormat = GL_RGBA;
 575       else
 576          internalFormat = GL_RGB;
 577
 578       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 579                                          GL_RGBA, GL_UNSIGNED_BYTE);
 580
 581       _mesa_init_teximage_fields(ctx, target, texImage,
 582                                  tex->width0, tex->height0, 1, 0,
 583                                  internalFormat, texFormat);
 584
 585       width = tex->width0;
 586       height = tex->height0;
 587       depth = tex->depth0;
 588
 589       /* grow the image size until we hit level = 0 */
 590       while (level > 0) {
 591          if (width != 1)
 592             width <<= 1;
 593          if (height != 1)
 594             height <<= 1;
 595          if (depth != 1)
 596             depth <<= 1;
 597          level--;
 598       }
 599    }
 600    else {
 601       _mesa_clear_texture_image(ctx, texImage);
 602       width = height = depth = 0;
 603    }
 604
 605    pipe_resource_reference(&stImage->pt, tex);
 606    stObj->width0 = width;
 607    stObj->height0 = height;
 608    stObj->depth0 = depth;
 609
 610    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 611    _mesa_unlock_texture(ctx, texObj);
 612
 613    return TRUE;
 614 }
 615
 616 static void
 617 st_context_copy(struct st_context_iface *stctxi,
 618                 struct st_context_iface *stsrci, unsigned mask)
 619 {
 620    struct st_context *st = (struct st_context *) stctxi;
 621    struct st_context *src = (struct st_context *) stsrci;
 622
 623    _mesa_copy_context(src->ctx, st->ctx, mask);
 624 }
 625
 626 static boolean
 627 st_context_share(struct st_context_iface *stctxi,
 628                  struct st_context_iface *stsrci)
 629 {
 630    struct st_context *st = (struct st_context *) stctxi;
 631    struct st_context *src = (struct st_context *) stsrci;
 632
 633    return _mesa_share_state(st->ctx, src->ctx);
 634 }
 635
 636 static void
 637 st_context_destroy(struct st_context_iface *stctxi)
 638 {
 639    struct st_context *st = (struct st_context *) stctxi;
 640    st_destroy_context(st);
 641 }
 642
 643 static struct st_context_iface *
 644 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 645                       const struct st_context_attribs *attribs,
 646                       struct st_context_iface *shared_stctxi)
 647 {
 648    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 649    struct st_context *st;
 650    struct pipe_context *pipe;
 651    struct gl_config mode;
 652    gl_api api;
 653
 654    if (!(stapi->profile_mask & (1 << attribs->profile)))
 655       return NULL;
 656
 657    switch (attribs->profile) {
 658    case ST_PROFILE_DEFAULT:
 659       api = API_OPENGL;
 660       break;
 661    case ST_PROFILE_OPENGL_ES1:
 662       api = API_OPENGLES;
 663       break;
 664    case ST_PROFILE_OPENGL_ES2:
 665       api = API_OPENGLES2;
 666       break;
 667    case ST_PROFILE_OPENGL_CORE:
 668    default:
 669       return NULL;
 670       break;
 671    }
 672
 673    pipe = smapi->screen->context_create(smapi->screen, NULL);
 674    if (!pipe)
 675       return NULL;
 676
 677    st_visual_to_context_mode(&attribs->visual, &mode);
 678    st = st_create_context(api, pipe, &mode, shared_ctx);
 679    if (!st) {
 680       pipe->destroy(pipe);
 681       return NULL;
 682    }
 683
 684    /* need to perform version check */
 685    if (attribs->major > 1 || attribs->minor > 0) {
 686       _mesa_compute_version(st->ctx);
 687
 688       if (st->ctx->VersionMajor < attribs->major ||
 689           st->ctx->VersionMajor < attribs->minor) {
 690          st_destroy_context(st);
 691          return NULL;
 692       }
 693    }
 694
 695    st->invalidate_on_gl_viewport =
 696       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 697
 698    st->iface.destroy = st_context_destroy;
 699    st->iface.notify_invalid_framebuffer =
 700       st_context_notify_invalid_framebuffer;
 701    st->iface.flush = st_context_flush;
 702    st->iface.teximage = st_context_teximage;
 703    st->iface.copy = st_context_copy;
 704    st->iface.share = st_context_share;
 705    st->iface.st_context_private = (void *) smapi;
 706
 707    return &st->iface;
 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, *stfb;
 717    boolean ret;
 718
 719    _glapi_check_multithread();
 720
 721    if (st) {
 722       /* reuse/create the draw fb */
 723       stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 724       if (stfb && stfb->iface == stdrawi) {
 725          stdraw = NULL;
 726          st_framebuffer_reference(&stdraw, stfb);
 727       }
 728       else {
 729          stdraw = st_framebuffer_create(stdrawi);
 730       }
 731
 732       /* reuse/create the read fb */
 733       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 734       if (!stfb || stfb->iface != streadi)
 735          stfb = stdraw;
 736       if (stfb && stfb->iface == streadi) {
 737          stread = NULL;
 738          st_framebuffer_reference(&stread, stfb);
 739       }
 740       else {
 741          stread = st_framebuffer_create(streadi);
 742       }
 743
 744       if (stdraw && stread) {
 745          st_framebuffer_validate(stdraw, st);
 746          if (stread != stdraw)
 747             st_framebuffer_validate(stread, st);
 748
 749          /* modify the draw/read buffers of the context */
 750          if (stdraw->iface) {
 751             st_visual_to_default_buffer(stdraw->iface->visual,
 752                   &st->ctx->Color.DrawBuffer[0], NULL);
 753          }
 754          if (stread->iface) {
 755             st_visual_to_default_buffer(stread->iface->visual,
 756                   &st->ctx->Pixel.ReadBuffer, NULL);
 757          }
 758
 759          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 760       }
 761       else {
 762          ret = FALSE;
 763       }
 764
 765       st_framebuffer_reference(&stdraw, NULL);
 766       st_framebuffer_reference(&stread, NULL);
 767    }
 768    else {
 769       ret = _mesa_make_current(NULL, NULL, NULL);
 770    }
 771
 772    return ret;
 773 }
 774
 775 static struct st_context_iface *
 776 st_api_get_current(struct st_api *stapi)
 777 {
 778    GET_CURRENT_CONTEXT(ctx);
 779    struct st_context *st = (ctx) ? ctx->st : NULL;
 780
 781    return (st) ? &st->iface : NULL;
 782 }
 783
 784 static st_proc_t
 785 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 786 {
 787    return (st_proc_t) _glapi_get_proc_address(procname);
 788 }
 789
 790 static void
 791 st_api_destroy(struct st_api *stapi)
 792 {
 793 }
 794
 795 /**
 796  * Flush the front buffer if the current context renders to the front buffer.
 797  */
 798 void
 799 st_manager_flush_frontbuffer(struct st_context *st)
 800 {
 801    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 802    struct st_renderbuffer *strb = NULL;
 803
 804    if (stfb)
 805       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 806    if (!strb)
 807       return;
 808
 809    /* never a dummy fb */
 810    assert(stfb->iface);
 811    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 812 }
 813
 814 /**
 815  * Return the surface of an EGLImage.
 816  */
 817 struct pipe_surface *
 818 st_manager_get_egl_image_surface(struct st_context *st,
 819                                  void *eglimg, unsigned usage)
 820 {
 821    struct st_manager *smapi =
 822       (struct st_manager *) st->iface.st_context_private;
 823    struct st_egl_image stimg;
 824    struct pipe_surface *ps;
 825
 826    if (!smapi || !smapi->get_egl_image)
 827       return NULL;
 828
 829    memset(&stimg, 0, sizeof(stimg));
 830    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 831       return NULL;
 832
 833    ps = smapi->screen->get_tex_surface(smapi->screen,
 834          stimg.texture, stimg.face, stimg.level, stimg.zslice, usage);
 835    pipe_resource_reference(&stimg.texture, NULL);
 836
 837    return ps;
 838 }
 839
 840 /**
 841  * Re-validate the framebuffers.
 842  */
 843 void
 844 st_manager_validate_framebuffers(struct st_context *st)
 845 {
 846    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 847    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 848
 849    if (stdraw)
 850       st_framebuffer_validate(stdraw, st);
 851    if (stread && stread != stdraw)
 852       st_framebuffer_validate(stread, st);
 853 }
 854
 855 /**
 856  * Add a color renderbuffer on demand.
 857  */
 858 boolean
 859 st_manager_add_color_renderbuffer(struct st_context *st, struct gl_framebuffer *fb,
 860                                   gl_buffer_index idx)
 861 {
 862    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 863
 864    /* FBO */
 865    if (!stfb)
 866       return FALSE;
 867
 868    if (stfb->Base.Attachment[idx].Renderbuffer)
 869       return TRUE;
 870
 871    switch (idx) {
 872    case BUFFER_FRONT_LEFT:
 873    case BUFFER_BACK_LEFT:
 874    case BUFFER_FRONT_RIGHT:
 875    case BUFFER_BACK_RIGHT:
 876       break;
 877    default:
 878       return FALSE;
 879       break;
 880    }
 881
 882    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 883       return FALSE;
 884
 885    st_framebuffer_update_attachments(stfb);
 886    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 887
 888    return TRUE;
 889 }
 890
 891 static const struct st_api st_gl_api = {
 892    "Mesa " MESA_VERSION_STRING,
 893    ST_API_OPENGL,
 894 #if FEATURE_GL
 895    ST_PROFILE_DEFAULT_MASK |
 896 #endif
 897 #if FEATURE_ES1
 898    ST_PROFILE_OPENGL_ES1_MASK |
 899 #endif
 900 #if FEATURE_ES2
 901    ST_PROFILE_OPENGL_ES2_MASK |
 902 #endif
 903    0,
 904    st_api_destroy,
 905    st_api_get_proc_address,
 906    st_api_create_context,
 907    st_api_make_current,
 908    st_api_get_current,
 909 };
 910
 911 struct st_api *
 912 st_gl_api_create(void)
 913 {
 914    return (struct st_api *) &st_gl_api;
 915 }