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 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_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 struct gl_config from a visual.
 300  */
 301 static void
 302 st_visual_to_context_mode(const struct st_visual *visual,
 303                           struct gl_config *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    struct gl_config 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       struct gl_framebuffer *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    struct gl_framebuffer *fb = &stfb->Base;
 475    _mesa_reference_framebuffer((struct gl_framebuffer **) 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
 490    if (stfb && stfb->iface == stfbi) {
 491       p_atomic_set(&stfb->revalidate, TRUE);
 492    }
 493    else {
 494       /* This function is probably getting called when we've detected a
 495        * change in a window's size but the currently bound context is
 496        * not bound to that window.
 497        * If the st_framebuffer_iface structure had a pointer to the
 498        * corresponding st_framebuffer we'd be able to handle this.
 499        */
 500    }
 501 }
 502
 503 static void
 504 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 505                  struct pipe_fence_handle **fence)
 506 {
 507    struct st_context *st = (struct st_context *) stctxi;
 508    st_flush(st, flags, fence);
 509    if (flags & PIPE_FLUSH_RENDER_CACHE)
 510       st_manager_flush_frontbuffer(st);
 511 }
 512
 513 static boolean
 514 st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
 515                     int level, enum pipe_format internal_format,
 516                     struct pipe_resource *tex, boolean mipmap)
 517 {
 518    struct st_context *st = (struct st_context *) stctxi;
 519    struct gl_context *ctx = st->ctx;
 520    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 521    struct gl_texture_object *texObj;
 522    struct gl_texture_image *texImage;
 523    struct st_texture_object *stObj;
 524    struct st_texture_image *stImage;
 525    GLenum internalFormat;
 526    GLuint width, height, depth;
 527
 528    switch (target) {
 529    case ST_TEXTURE_1D:
 530       target = GL_TEXTURE_1D;
 531       break;
 532    case ST_TEXTURE_2D:
 533       target = GL_TEXTURE_2D;
 534       break;
 535    case ST_TEXTURE_3D:
 536       target = GL_TEXTURE_3D;
 537       break;
 538    case ST_TEXTURE_RECT:
 539       target = GL_TEXTURE_RECTANGLE_ARB;
 540       break;
 541    default:
 542       return FALSE;
 543       break;
 544    }
 545
 546    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 547    _mesa_lock_texture(ctx, texObj);
 548
 549    stObj = st_texture_object(texObj);
 550    /* switch to surface based */
 551    if (!stObj->surface_based) {
 552       _mesa_clear_texture_object(ctx, texObj);
 553       stObj->surface_based = GL_TRUE;
 554    }
 555
 556    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 557    stImage = st_texture_image(texImage);
 558    if (tex) {
 559       /*
 560        * XXX When internal_format and tex->format differ, st_finalize_texture
 561        * needs to allocate a new texture with internal_format and copy the
 562        * texture here into the new one.  It will result in surface_copy being
 563        * called on surfaces whose formats differ.
 564        *
 565        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 566        * is to use a sampler view.
 567        */
 568       if (!st_sampler_compat_formats(tex->format, internal_format))
 569          internal_format = tex->format;
 570
 571       if (util_format_get_component_bits(internal_format,
 572                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 573          internalFormat = GL_RGBA;
 574       else
 575          internalFormat = GL_RGB;
 576       _mesa_init_teximage_fields(ctx, target, texImage,
 577             tex->width0, tex->height0, 1, 0, internalFormat);
 578       texImage->TexFormat = st_ChooseTextureFormat(ctx, internalFormat,
 579             GL_RGBA, GL_UNSIGNED_BYTE);
 580       _mesa_set_fetch_functions(texImage, 2);
 581
 582       width = tex->width0;
 583       height = tex->height0;
 584       depth = tex->depth0;
 585
 586       /* grow the image size until we hit level = 0 */
 587       while (level > 0) {
 588          if (width != 1)
 589             width <<= 1;
 590          if (height != 1)
 591             height <<= 1;
 592          if (depth != 1)
 593             depth <<= 1;
 594          level--;
 595       }
 596    }
 597    else {
 598       _mesa_clear_texture_image(ctx, texImage);
 599       width = height = depth = 0;
 600    }
 601
 602    pipe_resource_reference(&stImage->pt, tex);
 603    stObj->width0 = width;
 604    stObj->height0 = height;
 605    stObj->depth0 = depth;
 606
 607    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 608    _mesa_unlock_texture(ctx, texObj);
 609
 610    return TRUE;
 611 }
 612
 613 static void
 614 st_context_destroy(struct st_context_iface *stctxi)
 615 {
 616    struct st_context *st = (struct st_context *) stctxi;
 617    st_destroy_context(st);
 618 }
 619
 620 static struct st_context_iface *
 621 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 622                       const struct st_context_attribs *attribs,
 623                       struct st_context_iface *shared_stctxi)
 624 {
 625    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 626    struct st_context *st;
 627    struct pipe_context *pipe;
 628    struct gl_config mode;
 629    gl_api api;
 630
 631    if (!(stapi->profile_mask & (1 << attribs->profile)))
 632       return NULL;
 633
 634    switch (attribs->profile) {
 635    case ST_PROFILE_DEFAULT:
 636       api = API_OPENGL;
 637       break;
 638    case ST_PROFILE_OPENGL_ES1:
 639       api = API_OPENGLES;
 640       break;
 641    case ST_PROFILE_OPENGL_ES2:
 642       api = API_OPENGLES2;
 643       break;
 644    case ST_PROFILE_OPENGL_CORE:
 645    default:
 646       return NULL;
 647       break;
 648    }
 649
 650    pipe = smapi->screen->context_create(smapi->screen, NULL);
 651    if (!pipe)
 652       return NULL;
 653
 654    st_visual_to_context_mode(&attribs->visual, &mode);
 655    st = st_create_context(api, pipe, &mode, shared_ctx);
 656    if (!st) {
 657       pipe->destroy(pipe);
 658       return NULL;
 659    }
 660
 661    /* need to perform version check */
 662    if (attribs->major > 1 || attribs->minor > 0) {
 663       _mesa_compute_version(st->ctx);
 664
 665       if (st->ctx->VersionMajor < attribs->major ||
 666           st->ctx->VersionMajor < attribs->minor) {
 667          st_destroy_context(st);
 668          return NULL;
 669       }
 670    }
 671
 672    st->invalidate_on_gl_viewport =
 673       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 674
 675    st->iface.destroy = st_context_destroy;
 676    st->iface.notify_invalid_framebuffer =
 677       st_context_notify_invalid_framebuffer;
 678    st->iface.flush = st_context_flush;
 679    st->iface.teximage = st_context_teximage;
 680    st->iface.copy = NULL;
 681    st->iface.st_context_private = (void *) smapi;
 682
 683    return &st->iface;
 684 }
 685
 686 static boolean
 687 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 688                     struct st_framebuffer_iface *stdrawi,
 689                     struct st_framebuffer_iface *streadi)
 690 {
 691    struct st_context *st = (struct st_context *) stctxi;
 692    struct st_framebuffer *stdraw, *stread, *stfb;
 693    boolean ret;
 694
 695    _glapi_check_multithread();
 696
 697    if (st) {
 698       /* reuse/create the draw fb */
 699       stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 700       if (stfb && stfb->iface == stdrawi) {
 701          stdraw = NULL;
 702          st_framebuffer_reference(&stdraw, stfb);
 703       }
 704       else {
 705          stdraw = st_framebuffer_create(stdrawi);
 706       }
 707
 708       /* reuse/create the read fb */
 709       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 710       if (!stfb || stfb->iface != streadi)
 711          stfb = stdraw;
 712       if (stfb && stfb->iface == streadi) {
 713          stread = NULL;
 714          st_framebuffer_reference(&stread, stfb);
 715       }
 716       else {
 717          stread = st_framebuffer_create(streadi);
 718       }
 719
 720       if (stdraw && stread) {
 721          st_framebuffer_validate(stdraw, st);
 722          if (stread != stdraw)
 723             st_framebuffer_validate(stread, st);
 724
 725          /* modify the draw/read buffers of the context */
 726          if (stdraw->iface) {
 727             st_visual_to_default_buffer(stdraw->iface->visual,
 728                   &st->ctx->Color.DrawBuffer[0], NULL);
 729          }
 730          if (stread->iface) {
 731             st_visual_to_default_buffer(stread->iface->visual,
 732                   &st->ctx->Pixel.ReadBuffer, NULL);
 733          }
 734
 735          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 736       }
 737       else {
 738          ret = FALSE;
 739       }
 740
 741       st_framebuffer_reference(&stdraw, NULL);
 742       st_framebuffer_reference(&stread, NULL);
 743    }
 744    else {
 745       ret = _mesa_make_current(NULL, NULL, NULL);
 746    }
 747
 748    return ret;
 749 }
 750
 751 static struct st_context_iface *
 752 st_api_get_current(struct st_api *stapi)
 753 {
 754    GET_CURRENT_CONTEXT(ctx);
 755    struct st_context *st = (ctx) ? ctx->st : NULL;
 756
 757    return (st) ? &st->iface : NULL;
 758 }
 759
 760 static st_proc_t
 761 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 762 {
 763    return (st_proc_t) _glapi_get_proc_address(procname);
 764 }
 765
 766 static void
 767 st_api_destroy(struct st_api *stapi)
 768 {
 769 }
 770
 771 /**
 772  * Flush the front buffer if the current context renders to the front buffer.
 773  */
 774 void
 775 st_manager_flush_frontbuffer(struct st_context *st)
 776 {
 777    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 778    struct st_renderbuffer *strb = NULL;
 779
 780    if (stfb)
 781       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 782    if (!strb)
 783       return;
 784
 785    /* never a dummy fb */
 786    assert(stfb->iface);
 787    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 788 }
 789
 790 /**
 791  * Return the surface of an EGLImage.
 792  */
 793 struct pipe_surface *
 794 st_manager_get_egl_image_surface(struct st_context *st,
 795                                  void *eglimg, unsigned usage)
 796 {
 797    struct st_manager *smapi =
 798       (struct st_manager *) st->iface.st_context_private;
 799    struct st_egl_image stimg;
 800    struct pipe_surface *ps;
 801
 802    if (!smapi || !smapi->get_egl_image)
 803       return NULL;
 804
 805    memset(&stimg, 0, sizeof(stimg));
 806    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 807       return NULL;
 808
 809    ps = smapi->screen->get_tex_surface(smapi->screen,
 810          stimg.texture, stimg.face, stimg.level, stimg.zslice, usage);
 811    pipe_resource_reference(&stimg.texture, NULL);
 812
 813    return ps;
 814 }
 815
 816 /**
 817  * Re-validate the framebuffers.
 818  */
 819 void
 820 st_manager_validate_framebuffers(struct st_context *st)
 821 {
 822    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 823    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 824
 825    if (stdraw)
 826       st_framebuffer_validate(stdraw, st);
 827    if (stread && stread != stdraw)
 828       st_framebuffer_validate(stread, st);
 829 }
 830
 831 /**
 832  * Add a color renderbuffer on demand.
 833  */
 834 boolean
 835 st_manager_add_color_renderbuffer(struct st_context *st, struct gl_framebuffer *fb,
 836                                   gl_buffer_index idx)
 837 {
 838    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 839
 840    /* FBO */
 841    if (!stfb)
 842       return FALSE;
 843
 844    if (stfb->Base.Attachment[idx].Renderbuffer)
 845       return TRUE;
 846
 847    switch (idx) {
 848    case BUFFER_FRONT_LEFT:
 849    case BUFFER_BACK_LEFT:
 850    case BUFFER_FRONT_RIGHT:
 851    case BUFFER_BACK_RIGHT:
 852       break;
 853    default:
 854       return FALSE;
 855       break;
 856    }
 857
 858    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 859       return FALSE;
 860
 861    st_framebuffer_update_attachments(stfb);
 862    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 863
 864    return TRUE;
 865 }
 866
 867 static const struct st_api st_gl_api = {
 868    "Mesa " MESA_VERSION_STRING,
 869    ST_API_OPENGL,
 870 #if FEATURE_GL
 871    ST_PROFILE_DEFAULT_MASK |
 872 #endif
 873 #if FEATURE_ES1
 874    ST_PROFILE_OPENGL_ES1_MASK |
 875 #endif
 876 #if FEATURE_ES2
 877    ST_PROFILE_OPENGL_ES2_MASK |
 878 #endif
 879    0,
 880    st_api_destroy,
 881    st_api_get_proc_address,
 882    st_api_create_context,
 883    st_api_make_current,
 884    st_api_get_current,
 885 };
 886
 887 struct st_api *
 888 st_gl_api_create(void)
 889 {
 890    return (struct st_api *) &st_gl_api;
 891 }