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/texfetch.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 GLframebuffer to an st_framebuffer.
  58  * Return NULL if the GLframebuffer 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(GLframebuffer *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_screen *screen = st->pipe->screen;
 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;
 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       ps = screen->get_tex_surface(screen, textures[i], 0, 0, 0,
 184                                    PIPE_BIND_RENDER_TARGET);
 185       if (ps) {
 186          pipe_surface_reference(&strb->surface, ps);
 187          pipe_resource_reference(&strb->texture, ps->texture);
 188          /* ownership transfered */
 189          pipe_surface_reference(&ps, NULL);
 190
 191          changed = TRUE;
 192
 193          strb->Base.Width = strb->surface->width;
 194          strb->Base.Height = strb->surface->height;
 195
 196          width = strb->Base.Width;
 197          height = strb->Base.Height;
 198       }
 199
 200       pipe_resource_reference(&textures[i], NULL);
 201    }
 202
 203    if (changed) {
 204       st->dirty.st |= ST_NEW_FRAMEBUFFER;
 205       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 206
 207       assert(stfb->Base.Width == width);
 208       assert(stfb->Base.Height == height);
 209    }
 210
 211    p_atomic_set(&stfb->revalidate, FALSE);
 212 }
 213
 214 /**
 215  * Update the attachments to validate by looping the existing renderbuffers.
 216  */
 217 static void
 218 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 219 {
 220    gl_buffer_index idx;
 221
 222    stfb->num_statts = 0;
 223    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 224       struct st_renderbuffer *strb;
 225       enum st_attachment_type statt;
 226
 227       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 228       if (!strb || strb->software)
 229          continue;
 230
 231       statt = buffer_index_to_attachment(idx);
 232       if (statt != ST_ATTACHMENT_INVALID &&
 233           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 234          stfb->statts[stfb->num_statts++] = statt;
 235    }
 236
 237    p_atomic_set(&stfb->revalidate, TRUE);
 238 }
 239
 240 /**
 241  * Add a renderbuffer to the framebuffer.
 242  */
 243 static boolean
 244 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 245                                 gl_buffer_index idx)
 246 {
 247    struct gl_renderbuffer *rb;
 248    enum pipe_format format;
 249    int samples;
 250    boolean sw;
 251
 252    if (!stfb->iface)
 253       return FALSE;
 254
 255    /* do not distinguish depth/stencil buffers */
 256    if (idx == BUFFER_STENCIL)
 257       idx = BUFFER_DEPTH;
 258
 259    switch (idx) {
 260    case BUFFER_DEPTH:
 261       format = stfb->iface->visual->depth_stencil_format;
 262       sw = FALSE;
 263       break;
 264    case BUFFER_ACCUM:
 265       format = stfb->iface->visual->accum_format;
 266       sw = TRUE;
 267       break;
 268    default:
 269       format = stfb->iface->visual->color_format;
 270       sw = FALSE;
 271       break;
 272    }
 273
 274    if (format == PIPE_FORMAT_NONE)
 275       return FALSE;
 276
 277    samples = stfb->iface->visual->samples;
 278    if (!samples)
 279       samples = st_get_msaa();
 280
 281    rb = st_new_renderbuffer_fb(format, samples, sw);
 282    if (!rb)
 283       return FALSE;
 284
 285    if (idx != BUFFER_DEPTH) {
 286       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 287    }
 288    else {
 289       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 290          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 291       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 292          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 293    }
 294
 295    return TRUE;
 296 }
 297
 298 /**
 299  * Intialize a __GLcontextModes from a visual.
 300  */
 301 static void
 302 st_visual_to_context_mode(const struct st_visual *visual,
 303                           __GLcontextModes *mode)
 304 {
 305    memset(mode, 0, sizeof(*mode));
 306
 307    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 308       mode->doubleBufferMode = GL_TRUE;
 309    if (st_visual_have_buffers(visual,
 310             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 311       mode->stereoMode = GL_TRUE;
 312
 313    if (visual->color_format != PIPE_FORMAT_NONE) {
 314       mode->rgbMode = GL_TRUE;
 315
 316       mode->redBits =
 317          util_format_get_component_bits(visual->color_format,
 318                UTIL_FORMAT_COLORSPACE_RGB, 0);
 319       mode->greenBits =
 320          util_format_get_component_bits(visual->color_format,
 321                UTIL_FORMAT_COLORSPACE_RGB, 1);
 322       mode->blueBits =
 323          util_format_get_component_bits(visual->color_format,
 324                UTIL_FORMAT_COLORSPACE_RGB, 2);
 325       mode->alphaBits =
 326          util_format_get_component_bits(visual->color_format,
 327                UTIL_FORMAT_COLORSPACE_RGB, 3);
 328
 329       mode->rgbBits = mode->redBits +
 330          mode->greenBits + mode->blueBits + mode->alphaBits;
 331    }
 332
 333    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 334       mode->depthBits =
 335          util_format_get_component_bits(visual->depth_stencil_format,
 336                UTIL_FORMAT_COLORSPACE_ZS, 0);
 337       mode->stencilBits =
 338          util_format_get_component_bits(visual->depth_stencil_format,
 339                UTIL_FORMAT_COLORSPACE_ZS, 1);
 340
 341       mode->haveDepthBuffer = mode->depthBits > 0;
 342       mode->haveStencilBuffer = mode->stencilBits > 0;
 343    }
 344
 345    if (visual->accum_format != PIPE_FORMAT_NONE) {
 346       mode->haveAccumBuffer = GL_TRUE;
 347
 348       mode->accumRedBits =
 349          util_format_get_component_bits(visual->accum_format,
 350                UTIL_FORMAT_COLORSPACE_RGB, 0);
 351       mode->accumGreenBits =
 352          util_format_get_component_bits(visual->accum_format,
 353                UTIL_FORMAT_COLORSPACE_RGB, 1);
 354       mode->accumBlueBits =
 355          util_format_get_component_bits(visual->accum_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 2);
 357       mode->accumAlphaBits =
 358          util_format_get_component_bits(visual->accum_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 3);
 360    }
 361
 362    if (visual->samples) {
 363       mode->sampleBuffers = 1;
 364       mode->samples = visual->samples;
 365    }
 366 }
 367
 368 /**
 369  * Determine the default draw or read buffer from a visual.
 370  */
 371 static void
 372 st_visual_to_default_buffer(const struct st_visual *visual,
 373                             GLenum *buffer, GLint *index)
 374 {
 375    enum st_attachment_type statt;
 376    GLenum buf;
 377    gl_buffer_index idx;
 378
 379    statt = visual->render_buffer;
 380    /* do nothing if an invalid render buffer is specified */
 381    if (statt == ST_ATTACHMENT_INVALID ||
 382        !st_visual_have_buffers(visual, 1 << statt))
 383       return;
 384
 385    switch (statt) {
 386    case ST_ATTACHMENT_FRONT_LEFT:
 387       buf = GL_FRONT_LEFT;
 388       idx = BUFFER_FRONT_LEFT;
 389       break;
 390    case ST_ATTACHMENT_BACK_LEFT:
 391       buf = GL_BACK_LEFT;
 392       idx = BUFFER_BACK_LEFT;
 393       break;
 394    case ST_ATTACHMENT_FRONT_RIGHT:
 395       buf = GL_FRONT_RIGHT;
 396       idx = BUFFER_FRONT_RIGHT;
 397       break;
 398    case ST_ATTACHMENT_BACK_RIGHT:
 399       buf = GL_BACK_RIGHT;
 400       idx = BUFFER_BACK_RIGHT;
 401       break;
 402    default:
 403       buf = GL_NONE;
 404       idx = BUFFER_COUNT;
 405       break;
 406    }
 407
 408    if (buf != GL_NONE) {
 409       if (buffer)
 410          *buffer = buf;
 411       if (index)
 412          *index = idx;
 413    }
 414 }
 415
 416 /**
 417  * Create a framebuffer from a manager interface.
 418  */
 419 static struct st_framebuffer *
 420 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 421 {
 422    struct st_framebuffer *stfb;
 423    __GLcontextModes mode;
 424    gl_buffer_index idx;
 425
 426    stfb = CALLOC_STRUCT(st_framebuffer);
 427    if (!stfb)
 428       return NULL;
 429
 430    /* for FBO-only context */
 431    if (!stfbi) {
 432       GLframebuffer *base = _mesa_get_incomplete_framebuffer();
 433
 434       stfb->Base = *base;
 435
 436       return stfb;
 437    }
 438
 439    st_visual_to_context_mode(stfbi->visual, &mode);
 440    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 441
 442    /* modify the draw/read buffers of the fb */
 443    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 444          &stfb->Base._ColorDrawBufferIndexes[0]);
 445    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 446          &stfb->Base._ColorReadBufferIndex);
 447
 448    stfb->iface = stfbi;
 449
 450    /* add the color buffer */
 451    idx = stfb->Base._ColorDrawBufferIndexes[0];
 452    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 453       FREE(stfb);
 454       return NULL;
 455    }
 456
 457    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 458    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 459
 460    st_framebuffer_update_attachments(stfb);
 461
 462    stfb->Base.Initialized = GL_TRUE;
 463
 464    return stfb;
 465 }
 466
 467 /**
 468  * Reference a framebuffer.
 469  */
 470 static void
 471 st_framebuffer_reference(struct st_framebuffer **ptr,
 472                          struct st_framebuffer *stfb)
 473 {
 474    GLframebuffer *fb = &stfb->Base;
 475    _mesa_reference_framebuffer((GLframebuffer **) ptr, fb);
 476 }
 477
 478 static void
 479 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 480                                       struct st_framebuffer_iface *stfbi)
 481 {
 482    struct st_context *st = (struct st_context *) stctxi;
 483    struct st_framebuffer *stfb;
 484
 485    /* either draw or read winsys fb */
 486    stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 487    if (!stfb || stfb->iface != stfbi)
 488       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 489    assert(stfb && stfb->iface == stfbi);
 490
 491    p_atomic_set(&stfb->revalidate, TRUE);
 492 }
 493
 494 static void
 495 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 496                  struct pipe_fence_handle **fence)
 497 {
 498    struct st_context *st = (struct st_context *) stctxi;
 499    st_flush(st, flags, fence);
 500    if (flags & PIPE_FLUSH_RENDER_CACHE)
 501       st_manager_flush_frontbuffer(st);
 502 }
 503
 504 static boolean
 505 st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
 506                     int level, enum pipe_format internal_format,
 507                     struct pipe_resource *tex, boolean mipmap)
 508 {
 509    struct st_context *st = (struct st_context *) stctxi;
 510    GLcontext *ctx = st->ctx;
 511    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 512    struct gl_texture_object *texObj;
 513    struct gl_texture_image *texImage;
 514    struct st_texture_object *stObj;
 515    struct st_texture_image *stImage;
 516    GLenum internalFormat;
 517    GLuint width, height, depth;
 518
 519    switch (target) {
 520    case ST_TEXTURE_1D:
 521       target = GL_TEXTURE_1D;
 522       break;
 523    case ST_TEXTURE_2D:
 524       target = GL_TEXTURE_2D;
 525       break;
 526    case ST_TEXTURE_3D:
 527       target = GL_TEXTURE_3D;
 528       break;
 529    case ST_TEXTURE_RECT:
 530       target = GL_TEXTURE_RECTANGLE_ARB;
 531       break;
 532    default:
 533       return FALSE;
 534       break;
 535    }
 536
 537    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 538    _mesa_lock_texture(ctx, texObj);
 539
 540    stObj = st_texture_object(texObj);
 541    /* switch to surface based */
 542    if (!stObj->surface_based) {
 543       _mesa_clear_texture_object(ctx, texObj);
 544       stObj->surface_based = GL_TRUE;
 545    }
 546
 547    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 548    stImage = st_texture_image(texImage);
 549    if (tex) {
 550       /*
 551        * XXX When internal_format and tex->format differ, st_finalize_texture
 552        * needs to allocate a new texture with internal_format and copy the
 553        * texture here into the new one.  It will result in surface_copy being
 554        * called on surfaces whose formats differ.
 555        *
 556        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 557        * is to use a sampler view.
 558        */
 559       if (!st_sampler_compat_formats(tex->format, internal_format))
 560          internal_format = tex->format;
 561
 562       if (util_format_get_component_bits(internal_format,
 563                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 564          internalFormat = GL_RGBA;
 565       else
 566          internalFormat = GL_RGB;
 567       _mesa_init_teximage_fields(ctx, target, texImage,
 568             tex->width0, tex->height0, 1, 0, internalFormat);
 569       texImage->TexFormat = st_ChooseTextureFormat(ctx, internalFormat,
 570             GL_RGBA, GL_UNSIGNED_BYTE);
 571       _mesa_set_fetch_functions(texImage, 2);
 572
 573       width = tex->width0;
 574       height = tex->height0;
 575       depth = tex->depth0;
 576
 577       /* grow the image size until we hit level = 0 */
 578       while (level > 0) {
 579          if (width != 1)
 580             width <<= 1;
 581          if (height != 1)
 582             height <<= 1;
 583          if (depth != 1)
 584             depth <<= 1;
 585          level--;
 586       }
 587    }
 588    else {
 589       _mesa_clear_texture_image(ctx, texImage);
 590       width = height = depth = 0;
 591    }
 592
 593    pipe_resource_reference(&stImage->pt, tex);
 594    stObj->width0 = width;
 595    stObj->height0 = height;
 596    stObj->depth0 = depth;
 597
 598    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 599    _mesa_unlock_texture(ctx, texObj);
 600
 601    return TRUE;
 602 }
 603
 604 static void
 605 st_context_destroy(struct st_context_iface *stctxi)
 606 {
 607    struct st_context *st = (struct st_context *) stctxi;
 608    st_destroy_context(st);
 609 }
 610
 611 static struct st_context_iface *
 612 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 613                       const struct st_context_attribs *attribs,
 614                       struct st_context_iface *shared_stctxi)
 615 {
 616    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 617    struct st_context *st;
 618    struct pipe_context *pipe;
 619    __GLcontextModes mode;
 620    gl_api api;
 621
 622    if (!(stapi->profile_mask & (1 << attribs->profile)))
 623       return NULL;
 624
 625    switch (attribs->profile) {
 626    case ST_PROFILE_DEFAULT:
 627       api = API_OPENGL;
 628       break;
 629    case ST_PROFILE_OPENGL_ES1:
 630       api = API_OPENGLES;
 631       break;
 632    case ST_PROFILE_OPENGL_ES2:
 633       api = API_OPENGLES2;
 634       break;
 635    case ST_PROFILE_OPENGL_CORE:
 636    default:
 637       return NULL;
 638       break;
 639    }
 640
 641    pipe = smapi->screen->context_create(smapi->screen, NULL);
 642    if (!pipe)
 643       return NULL;
 644
 645    st_visual_to_context_mode(&attribs->visual, &mode);
 646    st = st_create_context(api, pipe, &mode, shared_ctx);
 647    if (!st) {
 648       pipe->destroy(pipe);
 649       return NULL;
 650    }
 651
 652    /* need to perform version check */
 653    if (attribs->major > 1 || attribs->minor > 0) {
 654       _mesa_compute_version(st->ctx);
 655
 656       if (st->ctx->VersionMajor < attribs->major ||
 657           st->ctx->VersionMajor < attribs->minor) {
 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.notify_invalid_framebuffer =
 668       st_context_notify_invalid_framebuffer;
 669    st->iface.flush = st_context_flush;
 670    st->iface.teximage = st_context_teximage;
 671    st->iface.copy = NULL;
 672    st->iface.st_context_private = (void *) smapi;
 673
 674    return &st->iface;
 675 }
 676
 677 static boolean
 678 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 679                     struct st_framebuffer_iface *stdrawi,
 680                     struct st_framebuffer_iface *streadi)
 681 {
 682    struct st_context *st = (struct st_context *) stctxi;
 683    struct st_framebuffer *stdraw, *stread, *stfb;
 684    boolean ret;
 685
 686    _glapi_check_multithread();
 687
 688    if (st) {
 689       /* reuse/create the draw fb */
 690       stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 691       if (stfb && stfb->iface == stdrawi) {
 692          stdraw = NULL;
 693          st_framebuffer_reference(&stdraw, stfb);
 694       }
 695       else {
 696          stdraw = st_framebuffer_create(stdrawi);
 697       }
 698
 699       /* reuse/create the read fb */
 700       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 701       if (!stfb || stfb->iface != streadi)
 702          stfb = stdraw;
 703       if (stfb && stfb->iface == streadi) {
 704          stread = NULL;
 705          st_framebuffer_reference(&stread, stfb);
 706       }
 707       else {
 708          stread = st_framebuffer_create(streadi);
 709       }
 710
 711       if (stdraw && stread) {
 712          st_framebuffer_validate(stdraw, st);
 713          if (stread != stdraw)
 714             st_framebuffer_validate(stread, st);
 715
 716          /* modify the draw/read buffers of the context */
 717          if (stdraw->iface) {
 718             st_visual_to_default_buffer(stdraw->iface->visual,
 719                   &st->ctx->Color.DrawBuffer[0], NULL);
 720          }
 721          if (stread->iface) {
 722             st_visual_to_default_buffer(stread->iface->visual,
 723                   &st->ctx->Pixel.ReadBuffer, NULL);
 724          }
 725
 726          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 727       }
 728       else {
 729          ret = FALSE;
 730       }
 731
 732       st_framebuffer_reference(&stdraw, NULL);
 733       st_framebuffer_reference(&stread, NULL);
 734    }
 735    else {
 736       ret = _mesa_make_current(NULL, NULL, NULL);
 737    }
 738
 739    return ret;
 740 }
 741
 742 static struct st_context_iface *
 743 st_api_get_current(struct st_api *stapi)
 744 {
 745    GET_CURRENT_CONTEXT(ctx);
 746    struct st_context *st = (ctx) ? ctx->st : NULL;
 747
 748    return (st) ? &st->iface : NULL;
 749 }
 750
 751 static st_proc_t
 752 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 753 {
 754    return (st_proc_t) _glapi_get_proc_address(procname);
 755 }
 756
 757 static void
 758 st_api_destroy(struct st_api *stapi)
 759 {
 760 }
 761
 762 /**
 763  * Flush the front buffer if the current context renders to the front buffer.
 764  */
 765 void
 766 st_manager_flush_frontbuffer(struct st_context *st)
 767 {
 768    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 769    struct st_renderbuffer *strb = NULL;
 770
 771    if (stfb)
 772       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 773    if (!strb)
 774       return;
 775
 776    /* never a dummy fb */
 777    assert(stfb->iface);
 778    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 779 }
 780
 781 /**
 782  * Return the surface of an EGLImage.
 783  */
 784 struct pipe_surface *
 785 st_manager_get_egl_image_surface(struct st_context *st,
 786                                  void *eglimg, unsigned usage)
 787 {
 788    struct st_manager *smapi =
 789       (struct st_manager *) st->iface.st_context_private;
 790    struct st_egl_image stimg;
 791    struct pipe_surface *ps;
 792
 793    if (!smapi || !smapi->get_egl_image)
 794       return NULL;
 795
 796    memset(&stimg, 0, sizeof(stimg));
 797    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 798       return NULL;
 799
 800    ps = smapi->screen->get_tex_surface(smapi->screen,
 801          stimg.texture, stimg.face, stimg.level, stimg.zslice, usage);
 802    pipe_resource_reference(&stimg.texture, NULL);
 803
 804    return ps;
 805 }
 806
 807 /**
 808  * Re-validate the framebuffers.
 809  */
 810 void
 811 st_manager_validate_framebuffers(struct st_context *st)
 812 {
 813    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 814    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 815
 816    if (stdraw)
 817       st_framebuffer_validate(stdraw, st);
 818    if (stread && stread != stdraw)
 819       st_framebuffer_validate(stread, st);
 820 }
 821
 822 /**
 823  * Add a color renderbuffer on demand.
 824  */
 825 boolean
 826 st_manager_add_color_renderbuffer(struct st_context *st, GLframebuffer *fb,
 827                                   gl_buffer_index idx)
 828 {
 829    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 830
 831    /* FBO */
 832    if (!stfb)
 833       return FALSE;
 834
 835    if (stfb->Base.Attachment[idx].Renderbuffer)
 836       return TRUE;
 837
 838    switch (idx) {
 839    case BUFFER_FRONT_LEFT:
 840    case BUFFER_BACK_LEFT:
 841    case BUFFER_FRONT_RIGHT:
 842    case BUFFER_BACK_RIGHT:
 843       break;
 844    default:
 845       return FALSE;
 846       break;
 847    }
 848
 849    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 850       return FALSE;
 851
 852    st_framebuffer_update_attachments(stfb);
 853    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 854
 855    return TRUE;
 856 }
 857
 858 static const struct st_api st_gl_api = {
 859    ST_API_OPENGL,
 860 #if FEATURE_GL
 861    ST_PROFILE_DEFAULT_MASK |
 862 #endif
 863 #if FEATURE_ES1
 864    ST_PROFILE_OPENGL_ES1_MASK |
 865 #endif
 866 #if FEATURE_ES2
 867    ST_PROFILE_OPENGL_ES2_MASK |
 868 #endif
 869    0,
 870    st_api_destroy,
 871    st_api_get_proc_address,
 872    st_api_create_context,
 873    st_api_make_current,
 874    st_api_get_current,
 875 };
 876
 877 struct st_api *
 878 st_gl_api_create(void)
 879 {
 880    return (struct st_api *) &st_gl_api;
 881 }