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/texobj.h"
  42 #include "main/teximage.h"
  43 #include "main/texstate.h"
  44 #include "main/framebuffer.h"
  45 #include "main/fbobject.h"
  46 #include "main/renderbuffer.h"
  47 #include "main/version.h"
  48 #include "st_texture.h"
  49
  50 #include "st_context.h"
  51 #include "st_format.h"
  52 #include "st_cb_fbo.h"
  53 #include "st_cb_flush.h"
  54 #include "st_manager.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    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  67 }
  68
  69 /**
  70  * Map an attachment to a buffer index.
  71  */
  72 static INLINE gl_buffer_index
  73 attachment_to_buffer_index(enum st_attachment_type statt)
  74 {
  75    gl_buffer_index index;
  76
  77    switch (statt) {
  78    case ST_ATTACHMENT_FRONT_LEFT:
  79       index = BUFFER_FRONT_LEFT;
  80       break;
  81    case ST_ATTACHMENT_BACK_LEFT:
  82       index = BUFFER_BACK_LEFT;
  83       break;
  84    case ST_ATTACHMENT_FRONT_RIGHT:
  85       index = BUFFER_FRONT_RIGHT;
  86       break;
  87    case ST_ATTACHMENT_BACK_RIGHT:
  88       index = BUFFER_BACK_RIGHT;
  89       break;
  90    case ST_ATTACHMENT_DEPTH_STENCIL:
  91       index = BUFFER_DEPTH;
  92       break;
  93    case ST_ATTACHMENT_ACCUM:
  94       index = BUFFER_ACCUM;
  95       break;
  96    case ST_ATTACHMENT_SAMPLE:
  97    default:
  98       index = BUFFER_COUNT;
  99       break;
 100    }
 101
 102    return index;
 103 }
 104
 105 /**
 106  * Map a buffer index to an attachment.
 107  */
 108 static INLINE enum st_attachment_type
 109 buffer_index_to_attachment(gl_buffer_index index)
 110 {
 111    enum st_attachment_type statt;
 112
 113    switch (index) {
 114    case BUFFER_FRONT_LEFT:
 115       statt = ST_ATTACHMENT_FRONT_LEFT;
 116       break;
 117    case BUFFER_BACK_LEFT:
 118       statt = ST_ATTACHMENT_BACK_LEFT;
 119       break;
 120    case BUFFER_FRONT_RIGHT:
 121       statt = ST_ATTACHMENT_FRONT_RIGHT;
 122       break;
 123    case BUFFER_BACK_RIGHT:
 124       statt = ST_ATTACHMENT_BACK_RIGHT;
 125       break;
 126    case BUFFER_DEPTH:
 127       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 128       break;
 129    case BUFFER_ACCUM:
 130       statt = ST_ATTACHMENT_ACCUM;
 131       break;
 132    default:
 133       statt = ST_ATTACHMENT_INVALID;
 134       break;
 135    }
 136
 137    return statt;
 138 }
 139
 140 /**
 141  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 142  */
 143 static void
 144 st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
 145 {
 146    struct pipe_context *pipe = st->pipe;
 147    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 148    uint width, height;
 149    unsigned i;
 150    boolean changed = FALSE;
 151
 152    if (!p_atomic_read(&stfb->revalidate))
 153       return;
 154
 155    /* validate the fb */
 156    if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
 157       return;
 158
 159    width = stfb->Base.Width;
 160    height = stfb->Base.Height;
 161
 162    for (i = 0; i < stfb->num_statts; i++) {
 163       struct st_renderbuffer *strb;
 164       struct pipe_surface *ps, surf_tmpl;
 165       gl_buffer_index idx;
 166
 167       if (!textures[i])
 168          continue;
 169
 170       idx = attachment_to_buffer_index(stfb->statts[i]);
 171       if (idx >= BUFFER_COUNT) {
 172          pipe_resource_reference(&textures[i], NULL);
 173          continue;
 174       }
 175
 176       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 177       assert(strb);
 178       if (strb->texture == textures[i]) {
 179          pipe_resource_reference(&textures[i], NULL);
 180          continue;
 181       }
 182
 183       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 184       u_surface_default_template(&surf_tmpl, textures[i],
 185                                  PIPE_BIND_RENDER_TARGET);
 186       ps = pipe->create_surface(pipe, textures[i], &surf_tmpl);
 187       if (ps) {
 188          pipe_surface_reference(&strb->surface, ps);
 189          pipe_resource_reference(&strb->texture, ps->texture);
 190          /* ownership transfered */
 191          pipe_surface_reference(&ps, NULL);
 192
 193          changed = TRUE;
 194
 195          strb->Base.Width = strb->surface->width;
 196          strb->Base.Height = strb->surface->height;
 197
 198          width = strb->Base.Width;
 199          height = strb->Base.Height;
 200       }
 201
 202       pipe_resource_reference(&textures[i], NULL);
 203    }
 204
 205    if (changed) {
 206       st->dirty.st |= ST_NEW_FRAMEBUFFER;
 207       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 208
 209       assert(stfb->Base.Width == width);
 210       assert(stfb->Base.Height == height);
 211    }
 212
 213    p_atomic_set(&stfb->revalidate, FALSE);
 214 }
 215
 216 /**
 217  * Update the attachments to validate by looping the existing renderbuffers.
 218  */
 219 static void
 220 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 221 {
 222    gl_buffer_index idx;
 223
 224    stfb->num_statts = 0;
 225    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 226       struct st_renderbuffer *strb;
 227       enum st_attachment_type statt;
 228
 229       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 230       if (!strb || strb->software)
 231          continue;
 232
 233       statt = buffer_index_to_attachment(idx);
 234       if (statt != ST_ATTACHMENT_INVALID &&
 235           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 236          stfb->statts[stfb->num_statts++] = statt;
 237    }
 238
 239    p_atomic_set(&stfb->revalidate, TRUE);
 240 }
 241
 242 /**
 243  * Add a renderbuffer to the framebuffer.
 244  */
 245 static boolean
 246 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 247                                 gl_buffer_index idx)
 248 {
 249    struct gl_renderbuffer *rb;
 250    enum pipe_format format;
 251    int samples;
 252    boolean sw;
 253
 254    if (!stfb->iface)
 255       return FALSE;
 256
 257    /* do not distinguish depth/stencil buffers */
 258    if (idx == BUFFER_STENCIL)
 259       idx = BUFFER_DEPTH;
 260
 261    switch (idx) {
 262    case BUFFER_DEPTH:
 263       format = stfb->iface->visual->depth_stencil_format;
 264       sw = FALSE;
 265       break;
 266    case BUFFER_ACCUM:
 267       format = stfb->iface->visual->accum_format;
 268       sw = TRUE;
 269       break;
 270    default:
 271       format = stfb->iface->visual->color_format;
 272       sw = FALSE;
 273       break;
 274    }
 275
 276    if (format == PIPE_FORMAT_NONE)
 277       return FALSE;
 278
 279    samples = stfb->iface->visual->samples;
 280    if (!samples)
 281       samples = st_get_msaa();
 282
 283    rb = st_new_renderbuffer_fb(format, samples, sw);
 284    if (!rb)
 285       return FALSE;
 286
 287    if (idx != BUFFER_DEPTH) {
 288       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 289    }
 290    else {
 291       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 292          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 293       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 294          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 295    }
 296
 297    return TRUE;
 298 }
 299
 300 /**
 301  * Intialize a struct gl_config from a visual.
 302  */
 303 static void
 304 st_visual_to_context_mode(const struct st_visual *visual,
 305                           struct gl_config *mode)
 306 {
 307    memset(mode, 0, sizeof(*mode));
 308
 309    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 310       mode->doubleBufferMode = GL_TRUE;
 311    if (st_visual_have_buffers(visual,
 312             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 313       mode->stereoMode = GL_TRUE;
 314
 315    if (visual->color_format != PIPE_FORMAT_NONE) {
 316       mode->rgbMode = GL_TRUE;
 317
 318       mode->redBits =
 319          util_format_get_component_bits(visual->color_format,
 320                UTIL_FORMAT_COLORSPACE_RGB, 0);
 321       mode->greenBits =
 322          util_format_get_component_bits(visual->color_format,
 323                UTIL_FORMAT_COLORSPACE_RGB, 1);
 324       mode->blueBits =
 325          util_format_get_component_bits(visual->color_format,
 326                UTIL_FORMAT_COLORSPACE_RGB, 2);
 327       mode->alphaBits =
 328          util_format_get_component_bits(visual->color_format,
 329                UTIL_FORMAT_COLORSPACE_RGB, 3);
 330
 331       mode->rgbBits = mode->redBits +
 332          mode->greenBits + mode->blueBits + mode->alphaBits;
 333    }
 334
 335    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 336       mode->depthBits =
 337          util_format_get_component_bits(visual->depth_stencil_format,
 338                UTIL_FORMAT_COLORSPACE_ZS, 0);
 339       mode->stencilBits =
 340          util_format_get_component_bits(visual->depth_stencil_format,
 341                UTIL_FORMAT_COLORSPACE_ZS, 1);
 342
 343       mode->haveDepthBuffer = mode->depthBits > 0;
 344       mode->haveStencilBuffer = mode->stencilBits > 0;
 345    }
 346
 347    if (visual->accum_format != PIPE_FORMAT_NONE) {
 348       mode->haveAccumBuffer = GL_TRUE;
 349
 350       mode->accumRedBits =
 351          util_format_get_component_bits(visual->accum_format,
 352                UTIL_FORMAT_COLORSPACE_RGB, 0);
 353       mode->accumGreenBits =
 354          util_format_get_component_bits(visual->accum_format,
 355                UTIL_FORMAT_COLORSPACE_RGB, 1);
 356       mode->accumBlueBits =
 357          util_format_get_component_bits(visual->accum_format,
 358                UTIL_FORMAT_COLORSPACE_RGB, 2);
 359       mode->accumAlphaBits =
 360          util_format_get_component_bits(visual->accum_format,
 361                UTIL_FORMAT_COLORSPACE_RGB, 3);
 362    }
 363
 364    if (visual->samples) {
 365       mode->sampleBuffers = 1;
 366       mode->samples = visual->samples;
 367    }
 368 }
 369
 370 /**
 371  * Determine the default draw or read buffer from a visual.
 372  */
 373 static void
 374 st_visual_to_default_buffer(const struct st_visual *visual,
 375                             GLenum *buffer, GLint *index)
 376 {
 377    enum st_attachment_type statt;
 378    GLenum buf;
 379    gl_buffer_index idx;
 380
 381    statt = visual->render_buffer;
 382    /* do nothing if an invalid render buffer is specified */
 383    if (statt == ST_ATTACHMENT_INVALID ||
 384        !st_visual_have_buffers(visual, 1 << statt))
 385       return;
 386
 387    switch (statt) {
 388    case ST_ATTACHMENT_FRONT_LEFT:
 389       buf = GL_FRONT_LEFT;
 390       idx = BUFFER_FRONT_LEFT;
 391       break;
 392    case ST_ATTACHMENT_BACK_LEFT:
 393       buf = GL_BACK_LEFT;
 394       idx = BUFFER_BACK_LEFT;
 395       break;
 396    case ST_ATTACHMENT_FRONT_RIGHT:
 397       buf = GL_FRONT_RIGHT;
 398       idx = BUFFER_FRONT_RIGHT;
 399       break;
 400    case ST_ATTACHMENT_BACK_RIGHT:
 401       buf = GL_BACK_RIGHT;
 402       idx = BUFFER_BACK_RIGHT;
 403       break;
 404    default:
 405       buf = GL_NONE;
 406       idx = BUFFER_COUNT;
 407       break;
 408    }
 409
 410    if (buf != GL_NONE) {
 411       if (buffer)
 412          *buffer = buf;
 413       if (index)
 414          *index = idx;
 415    }
 416 }
 417
 418 /**
 419  * Create a framebuffer from a manager interface.
 420  */
 421 static struct st_framebuffer *
 422 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 423 {
 424    struct st_framebuffer *stfb;
 425    struct gl_config mode;
 426    gl_buffer_index idx;
 427
 428    stfb = CALLOC_STRUCT(st_framebuffer);
 429    if (!stfb)
 430       return NULL;
 431
 432    /* for FBO-only context */
 433    if (!stfbi) {
 434       struct gl_framebuffer *base = _mesa_get_incomplete_framebuffer();
 435
 436       stfb->Base = *base;
 437
 438       return stfb;
 439    }
 440
 441    st_visual_to_context_mode(stfbi->visual, &mode);
 442    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 443
 444    /* modify the draw/read buffers of the fb */
 445    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 446          &stfb->Base._ColorDrawBufferIndexes[0]);
 447    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 448          &stfb->Base._ColorReadBufferIndex);
 449
 450    stfb->iface = stfbi;
 451
 452    /* add the color buffer */
 453    idx = stfb->Base._ColorDrawBufferIndexes[0];
 454    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 455       FREE(stfb);
 456       return NULL;
 457    }
 458
 459    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 460    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 461
 462    st_framebuffer_update_attachments(stfb);
 463
 464    stfb->Base.Initialized = GL_TRUE;
 465
 466    return stfb;
 467 }
 468
 469 /**
 470  * Reference a framebuffer.
 471  */
 472 static void
 473 st_framebuffer_reference(struct st_framebuffer **ptr,
 474                          struct st_framebuffer *stfb)
 475 {
 476    struct gl_framebuffer *fb = &stfb->Base;
 477    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 478 }
 479
 480 static void
 481 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 482                                       struct st_framebuffer_iface *stfbi)
 483 {
 484    struct st_context *st = (struct st_context *) stctxi;
 485    struct st_framebuffer *stfb;
 486
 487    /* either draw or read winsys fb */
 488    stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 489    if (!stfb || stfb->iface != stfbi)
 490       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 491
 492    if (stfb && stfb->iface == stfbi) {
 493       p_atomic_set(&stfb->revalidate, TRUE);
 494    }
 495    else {
 496       /* This function is probably getting called when we've detected a
 497        * change in a window's size but the currently bound context is
 498        * not bound to that window.
 499        * If the st_framebuffer_iface structure had a pointer to the
 500        * corresponding st_framebuffer we'd be able to handle this.
 501        */
 502    }
 503 }
 504
 505 static void
 506 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 507                  struct pipe_fence_handle **fence)
 508 {
 509    struct st_context *st = (struct st_context *) stctxi;
 510    st_flush(st, flags, fence);
 511    if (flags & PIPE_FLUSH_RENDER_CACHE)
 512       st_manager_flush_frontbuffer(st);
 513 }
 514
 515 static boolean
 516 st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
 517                     int level, enum pipe_format internal_format,
 518                     struct pipe_resource *tex, boolean mipmap)
 519 {
 520    struct st_context *st = (struct st_context *) stctxi;
 521    struct gl_context *ctx = st->ctx;
 522    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 523    struct gl_texture_object *texObj;
 524    struct gl_texture_image *texImage;
 525    struct st_texture_object *stObj;
 526    struct st_texture_image *stImage;
 527    GLenum internalFormat;
 528    GLuint width, height, depth;
 529
 530    switch (target) {
 531    case ST_TEXTURE_1D:
 532       target = GL_TEXTURE_1D;
 533       break;
 534    case ST_TEXTURE_2D:
 535       target = GL_TEXTURE_2D;
 536       break;
 537    case ST_TEXTURE_3D:
 538       target = GL_TEXTURE_3D;
 539       break;
 540    case ST_TEXTURE_RECT:
 541       target = GL_TEXTURE_RECTANGLE_ARB;
 542       break;
 543    default:
 544       return FALSE;
 545       break;
 546    }
 547
 548    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 549    _mesa_lock_texture(ctx, texObj);
 550
 551    stObj = st_texture_object(texObj);
 552    /* switch to surface based */
 553    if (!stObj->surface_based) {
 554       _mesa_clear_texture_object(ctx, texObj);
 555       stObj->surface_based = GL_TRUE;
 556    }
 557
 558    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 559    stImage = st_texture_image(texImage);
 560    if (tex) {
 561       gl_format texFormat;
 562
 563       /*
 564        * XXX When internal_format and tex->format differ, st_finalize_texture
 565        * needs to allocate a new texture with internal_format and copy the
 566        * texture here into the new one.  It will result in surface_copy being
 567        * called on surfaces whose formats differ.
 568        *
 569        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 570        * is to use a sampler view.
 571        */
 572       if (!st_sampler_compat_formats(tex->format, internal_format))
 573          internal_format = tex->format;
 574
 575       if (util_format_get_component_bits(internal_format,
 576                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 577          internalFormat = GL_RGBA;
 578       else
 579          internalFormat = GL_RGB;
 580
 581       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 582                                          GL_RGBA, GL_UNSIGNED_BYTE);
 583
 584       _mesa_init_teximage_fields(ctx, target, texImage,
 585                                  tex->width0, tex->height0, 1, 0,
 586                                  internalFormat, texFormat);
 587
 588       width = tex->width0;
 589       height = tex->height0;
 590       depth = tex->depth0;
 591
 592       /* grow the image size until we hit level = 0 */
 593       while (level > 0) {
 594          if (width != 1)
 595             width <<= 1;
 596          if (height != 1)
 597             height <<= 1;
 598          if (depth != 1)
 599             depth <<= 1;
 600          level--;
 601       }
 602    }
 603    else {
 604       _mesa_clear_texture_image(ctx, texImage);
 605       width = height = depth = 0;
 606    }
 607
 608    pipe_resource_reference(&stImage->pt, tex);
 609    stObj->width0 = width;
 610    stObj->height0 = height;
 611    stObj->depth0 = depth;
 612
 613    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 614    _mesa_unlock_texture(ctx, texObj);
 615
 616    return TRUE;
 617 }
 618
 619 static void
 620 st_context_copy(struct st_context_iface *stctxi,
 621                 struct st_context_iface *stsrci, unsigned mask)
 622 {
 623    struct st_context *st = (struct st_context *) stctxi;
 624    struct st_context *src = (struct st_context *) stsrci;
 625
 626    _mesa_copy_context(src->ctx, st->ctx, mask);
 627 }
 628
 629 static boolean
 630 st_context_share(struct st_context_iface *stctxi,
 631                  struct st_context_iface *stsrci)
 632 {
 633    struct st_context *st = (struct st_context *) stctxi;
 634    struct st_context *src = (struct st_context *) stsrci;
 635
 636    return _mesa_share_state(st->ctx, src->ctx);
 637 }
 638
 639 static void
 640 st_context_destroy(struct st_context_iface *stctxi)
 641 {
 642    struct st_context *st = (struct st_context *) stctxi;
 643    st_destroy_context(st);
 644 }
 645
 646 static struct st_context_iface *
 647 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 648                       const struct st_context_attribs *attribs,
 649                       struct st_context_iface *shared_stctxi)
 650 {
 651    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 652    struct st_context *st;
 653    struct pipe_context *pipe;
 654    struct gl_config mode;
 655    gl_api api;
 656
 657    if (!(stapi->profile_mask & (1 << attribs->profile)))
 658       return NULL;
 659
 660    switch (attribs->profile) {
 661    case ST_PROFILE_DEFAULT:
 662       api = API_OPENGL;
 663       break;
 664    case ST_PROFILE_OPENGL_ES1:
 665       api = API_OPENGLES;
 666       break;
 667    case ST_PROFILE_OPENGL_ES2:
 668       api = API_OPENGLES2;
 669       break;
 670    case ST_PROFILE_OPENGL_CORE:
 671    default:
 672       return NULL;
 673       break;
 674    }
 675
 676    pipe = smapi->screen->context_create(smapi->screen, NULL);
 677    if (!pipe)
 678       return NULL;
 679
 680    st_visual_to_context_mode(&attribs->visual, &mode);
 681    st = st_create_context(api, pipe, &mode, shared_ctx);
 682    if (!st) {
 683       pipe->destroy(pipe);
 684       return NULL;
 685    }
 686
 687    /* need to perform version check */
 688    if (attribs->major > 1 || attribs->minor > 0) {
 689       _mesa_compute_version(st->ctx);
 690
 691       if (st->ctx->VersionMajor < attribs->major ||
 692           st->ctx->VersionMajor < attribs->minor) {
 693          st_destroy_context(st);
 694          return NULL;
 695       }
 696    }
 697
 698    st->invalidate_on_gl_viewport =
 699       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 700
 701    st->iface.destroy = st_context_destroy;
 702    st->iface.notify_invalid_framebuffer =
 703       st_context_notify_invalid_framebuffer;
 704    st->iface.flush = st_context_flush;
 705    st->iface.teximage = st_context_teximage;
 706    st->iface.copy = st_context_copy;
 707    st->iface.share = st_context_share;
 708    st->iface.st_context_private = (void *) smapi;
 709
 710    return &st->iface;
 711 }
 712
 713 static boolean
 714 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 715                     struct st_framebuffer_iface *stdrawi,
 716                     struct st_framebuffer_iface *streadi)
 717 {
 718    struct st_context *st = (struct st_context *) stctxi;
 719    struct st_framebuffer *stdraw, *stread, *stfb;
 720    boolean ret;
 721
 722    _glapi_check_multithread();
 723
 724    if (st) {
 725       /* reuse/create the draw fb */
 726       stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 727       if (stfb && stfb->iface == stdrawi) {
 728          stdraw = NULL;
 729          st_framebuffer_reference(&stdraw, stfb);
 730       }
 731       else {
 732          stdraw = st_framebuffer_create(stdrawi);
 733       }
 734
 735       /* reuse/create the read fb */
 736       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 737       if (!stfb || stfb->iface != streadi)
 738          stfb = stdraw;
 739       if (stfb && stfb->iface == streadi) {
 740          stread = NULL;
 741          st_framebuffer_reference(&stread, stfb);
 742       }
 743       else {
 744          stread = st_framebuffer_create(streadi);
 745       }
 746
 747       if (stdraw && stread) {
 748          st_framebuffer_validate(stdraw, st);
 749          if (stread != stdraw)
 750             st_framebuffer_validate(stread, st);
 751
 752          /* modify the draw/read buffers of the context */
 753          if (stdraw->iface) {
 754             st_visual_to_default_buffer(stdraw->iface->visual,
 755                   &st->ctx->Color.DrawBuffer[0], NULL);
 756          }
 757          if (stread->iface) {
 758             st_visual_to_default_buffer(stread->iface->visual,
 759                   &st->ctx->Pixel.ReadBuffer, NULL);
 760          }
 761
 762          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 763       }
 764       else {
 765          ret = FALSE;
 766       }
 767
 768       st_framebuffer_reference(&stdraw, NULL);
 769       st_framebuffer_reference(&stread, NULL);
 770    }
 771    else {
 772       ret = _mesa_make_current(NULL, NULL, NULL);
 773    }
 774
 775    return ret;
 776 }
 777
 778 static struct st_context_iface *
 779 st_api_get_current(struct st_api *stapi)
 780 {
 781    GET_CURRENT_CONTEXT(ctx);
 782    struct st_context *st = (ctx) ? ctx->st : NULL;
 783
 784    return (st) ? &st->iface : NULL;
 785 }
 786
 787 static st_proc_t
 788 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 789 {
 790    return (st_proc_t) _glapi_get_proc_address(procname);
 791 }
 792
 793 static void
 794 st_api_destroy(struct st_api *stapi)
 795 {
 796 }
 797
 798 /**
 799  * Flush the front buffer if the current context renders to the front buffer.
 800  */
 801 void
 802 st_manager_flush_frontbuffer(struct st_context *st)
 803 {
 804    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 805    struct st_renderbuffer *strb = NULL;
 806
 807    if (stfb)
 808       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 809    if (!strb)
 810       return;
 811
 812    /* never a dummy fb */
 813    assert(stfb->iface);
 814    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 815 }
 816
 817 /**
 818  * Return the surface of an EGLImage.
 819  * FIXME: I think this should operate on resources, not surfaces
 820  */
 821 struct pipe_surface *
 822 st_manager_get_egl_image_surface(struct st_context *st,
 823                                  void *eglimg, unsigned usage)
 824 {
 825    struct st_manager *smapi =
 826       (struct st_manager *) st->iface.st_context_private;
 827    struct st_egl_image stimg;
 828    struct pipe_surface *ps, surf_tmpl;
 829
 830    if (!smapi || !smapi->get_egl_image)
 831       return NULL;
 832
 833    memset(&stimg, 0, sizeof(stimg));
 834    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 835       return NULL;
 836
 837    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 838    surf_tmpl.format = stimg.texture->format;
 839    surf_tmpl.usage = usage;
 840    surf_tmpl.u.tex.level = stimg.level;
 841    surf_tmpl.u.tex.first_layer = stimg.layer;
 842    surf_tmpl.u.tex.last_layer = stimg.layer;
 843    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 844    pipe_resource_reference(&stimg.texture, NULL);
 845
 846    return ps;
 847 }
 848
 849 /**
 850  * Re-validate the framebuffers.
 851  */
 852 void
 853 st_manager_validate_framebuffers(struct st_context *st)
 854 {
 855    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 856    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 857
 858    if (stdraw)
 859       st_framebuffer_validate(stdraw, st);
 860    if (stread && stread != stdraw)
 861       st_framebuffer_validate(stread, st);
 862 }
 863
 864 /**
 865  * Add a color renderbuffer on demand.
 866  */
 867 boolean
 868 st_manager_add_color_renderbuffer(struct st_context *st, struct gl_framebuffer *fb,
 869                                   gl_buffer_index idx)
 870 {
 871    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 872
 873    /* FBO */
 874    if (!stfb)
 875       return FALSE;
 876
 877    if (stfb->Base.Attachment[idx].Renderbuffer)
 878       return TRUE;
 879
 880    switch (idx) {
 881    case BUFFER_FRONT_LEFT:
 882    case BUFFER_BACK_LEFT:
 883    case BUFFER_FRONT_RIGHT:
 884    case BUFFER_BACK_RIGHT:
 885       break;
 886    default:
 887       return FALSE;
 888       break;
 889    }
 890
 891    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 892       return FALSE;
 893
 894    st_framebuffer_update_attachments(stfb);
 895    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 896
 897    return TRUE;
 898 }
 899
 900 static const struct st_api st_gl_api = {
 901    "Mesa " MESA_VERSION_STRING,
 902    ST_API_OPENGL,
 903 #if FEATURE_GL
 904    ST_PROFILE_DEFAULT_MASK |
 905 #endif
 906 #if FEATURE_ES1
 907    ST_PROFILE_OPENGL_ES1_MASK |
 908 #endif
 909 #if FEATURE_ES2
 910    ST_PROFILE_OPENGL_ES2_MASK |
 911 #endif
 912    0,
 913    st_api_destroy,
 914    st_api_get_proc_address,
 915    st_api_create_context,
 916    st_api_make_current,
 917    st_api_get_current,
 918 };
 919
 920 struct st_api *
 921 st_gl_api_create(void)
 922 {
 923    return (struct st_api *) &st_gl_api;
 924 }