src/mesa/state_tracker/st_manager.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.9
   4  *
   5  * Copyright (C) 2010 LunarG Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  22  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  23  * DEALINGS IN THE SOFTWARE.
  24  *
  25  * Authors:
  26  *    Chia-I Wu <olv@lunarg.com>
  27  */
  28
  29 #include "state_tracker/st_gl_api.h"
  30
  31 #include "pipe/p_context.h"
  32 #include "pipe/p_screen.h"
  33 #include "util/u_format.h"
  34 #include "util/u_pointer.h"
  35 #include "util/u_inlines.h"
  36 #include "util/u_atomic.h"
  37 #include "util/u_surface.h"
  38
  39 #include "main/mtypes.h"
  40 #include "main/context.h"
  41 #include "main/mfeatures.h"
  42 #include "main/texobj.h"
  43 #include "main/teximage.h"
  44 #include "main/texstate.h"
  45 #include "main/framebuffer.h"
  46 #include "main/fbobject.h"
  47 #include "main/renderbuffer.h"
  48 #include "main/version.h"
  49 #include "st_texture.h"
  50
  51 #include "st_context.h"
  52 #include "st_format.h"
  53 #include "st_cb_fbo.h"
  54 #include "st_cb_flush.h"
  55 #include "st_manager.h"
  56
  57 /**
  58  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  59  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  60  * We'll only return non-null for window system framebuffers.
  61  * Note that this function may fail.
  62  */
  63 static INLINE struct st_framebuffer *
  64 st_ws_framebuffer(struct gl_framebuffer *fb)
  65 {
  66    /* FBO cannot be casted.  See st_new_framebuffer */
  67    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  68 }
  69
  70 /**
  71  * Map an attachment to a buffer index.
  72  */
  73 static INLINE gl_buffer_index
  74 attachment_to_buffer_index(enum st_attachment_type statt)
  75 {
  76    gl_buffer_index index;
  77
  78    switch (statt) {
  79    case ST_ATTACHMENT_FRONT_LEFT:
  80       index = BUFFER_FRONT_LEFT;
  81       break;
  82    case ST_ATTACHMENT_BACK_LEFT:
  83       index = BUFFER_BACK_LEFT;
  84       break;
  85    case ST_ATTACHMENT_FRONT_RIGHT:
  86       index = BUFFER_FRONT_RIGHT;
  87       break;
  88    case ST_ATTACHMENT_BACK_RIGHT:
  89       index = BUFFER_BACK_RIGHT;
  90       break;
  91    case ST_ATTACHMENT_DEPTH_STENCIL:
  92       index = BUFFER_DEPTH;
  93       break;
  94    case ST_ATTACHMENT_ACCUM:
  95       index = BUFFER_ACCUM;
  96       break;
  97    case ST_ATTACHMENT_SAMPLE:
  98    default:
  99       index = BUFFER_COUNT;
 100       break;
 101    }
 102
 103    return index;
 104 }
 105
 106 /**
 107  * Map a buffer index to an attachment.
 108  */
 109 static INLINE enum st_attachment_type
 110 buffer_index_to_attachment(gl_buffer_index index)
 111 {
 112    enum st_attachment_type statt;
 113
 114    switch (index) {
 115    case BUFFER_FRONT_LEFT:
 116       statt = ST_ATTACHMENT_FRONT_LEFT;
 117       break;
 118    case BUFFER_BACK_LEFT:
 119       statt = ST_ATTACHMENT_BACK_LEFT;
 120       break;
 121    case BUFFER_FRONT_RIGHT:
 122       statt = ST_ATTACHMENT_FRONT_RIGHT;
 123       break;
 124    case BUFFER_BACK_RIGHT:
 125       statt = ST_ATTACHMENT_BACK_RIGHT;
 126       break;
 127    case BUFFER_DEPTH:
 128       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 129       break;
 130    case BUFFER_ACCUM:
 131       statt = ST_ATTACHMENT_ACCUM;
 132       break;
 133    default:
 134       statt = ST_ATTACHMENT_INVALID;
 135       break;
 136    }
 137
 138    return statt;
 139 }
 140
 141 /**
 142  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 143  */
 144 static void
 145 st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
 146 {
 147    struct pipe_context *pipe = st->pipe;
 148    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 149    uint width, height;
 150    unsigned i;
 151    boolean changed = FALSE;
 152
 153    if (!p_atomic_read(&stfb->revalidate))
 154       return;
 155
 156    /* validate the fb */
 157    if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
 158       return;
 159
 160    width = stfb->Base.Width;
 161    height = stfb->Base.Height;
 162
 163    for (i = 0; i < stfb->num_statts; i++) {
 164       struct st_renderbuffer *strb;
 165       struct pipe_surface *ps, surf_tmpl;
 166       gl_buffer_index idx;
 167
 168       if (!textures[i])
 169          continue;
 170
 171       idx = attachment_to_buffer_index(stfb->statts[i]);
 172       if (idx >= BUFFER_COUNT) {
 173          pipe_resource_reference(&textures[i], NULL);
 174          continue;
 175       }
 176
 177       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 178       assert(strb);
 179       if (strb->texture == textures[i]) {
 180          pipe_resource_reference(&textures[i], NULL);
 181          continue;
 182       }
 183
 184       memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 185       u_surface_default_template(&surf_tmpl, textures[i],
 186                                  PIPE_BIND_RENDER_TARGET);
 187       ps = pipe->create_surface(pipe, textures[i], &surf_tmpl);
 188       if (ps) {
 189          pipe_surface_reference(&strb->surface, ps);
 190          pipe_resource_reference(&strb->texture, ps->texture);
 191          /* ownership transfered */
 192          pipe_surface_reference(&ps, NULL);
 193
 194          changed = TRUE;
 195
 196          strb->Base.Width = strb->surface->width;
 197          strb->Base.Height = strb->surface->height;
 198
 199          width = strb->Base.Width;
 200          height = strb->Base.Height;
 201       }
 202
 203       pipe_resource_reference(&textures[i], NULL);
 204    }
 205
 206    if (changed) {
 207       st->dirty.st |= ST_NEW_FRAMEBUFFER;
 208       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 209
 210       assert(stfb->Base.Width == width);
 211       assert(stfb->Base.Height == height);
 212    }
 213
 214    p_atomic_set(&stfb->revalidate, FALSE);
 215 }
 216
 217 /**
 218  * Update the attachments to validate by looping the existing renderbuffers.
 219  */
 220 static void
 221 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 222 {
 223    gl_buffer_index idx;
 224
 225    stfb->num_statts = 0;
 226    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 227       struct st_renderbuffer *strb;
 228       enum st_attachment_type statt;
 229
 230       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 231       if (!strb || strb->software)
 232          continue;
 233
 234       statt = buffer_index_to_attachment(idx);
 235       if (statt != ST_ATTACHMENT_INVALID &&
 236           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 237          stfb->statts[stfb->num_statts++] = statt;
 238    }
 239
 240    p_atomic_set(&stfb->revalidate, TRUE);
 241 }
 242
 243 /**
 244  * Add a renderbuffer to the framebuffer.
 245  */
 246 static boolean
 247 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 248                                 gl_buffer_index idx)
 249 {
 250    struct gl_renderbuffer *rb;
 251    enum pipe_format format;
 252    int samples;
 253    boolean sw;
 254
 255    if (!stfb->iface)
 256       return FALSE;
 257
 258    /* do not distinguish depth/stencil buffers */
 259    if (idx == BUFFER_STENCIL)
 260       idx = BUFFER_DEPTH;
 261
 262    switch (idx) {
 263    case BUFFER_DEPTH:
 264       format = stfb->iface->visual->depth_stencil_format;
 265       sw = FALSE;
 266       break;
 267    case BUFFER_ACCUM:
 268       format = stfb->iface->visual->accum_format;
 269       sw = TRUE;
 270       break;
 271    default:
 272       format = stfb->iface->visual->color_format;
 273       sw = FALSE;
 274       break;
 275    }
 276
 277    if (format == PIPE_FORMAT_NONE)
 278       return FALSE;
 279
 280    samples = stfb->iface->visual->samples;
 281    if (!samples)
 282       samples = st_get_msaa();
 283
 284    rb = st_new_renderbuffer_fb(format, samples, sw);
 285    if (!rb)
 286       return FALSE;
 287
 288    if (idx != BUFFER_DEPTH) {
 289       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 290    }
 291    else {
 292       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 293          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 294       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 295          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 296    }
 297
 298    return TRUE;
 299 }
 300
 301 /**
 302  * Intialize a struct gl_config from a visual.
 303  */
 304 static void
 305 st_visual_to_context_mode(const struct st_visual *visual,
 306                           struct gl_config *mode)
 307 {
 308    memset(mode, 0, sizeof(*mode));
 309
 310    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 311       mode->doubleBufferMode = GL_TRUE;
 312    if (st_visual_have_buffers(visual,
 313             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 314       mode->stereoMode = GL_TRUE;
 315
 316    if (visual->color_format != PIPE_FORMAT_NONE) {
 317       mode->rgbMode = GL_TRUE;
 318
 319       mode->redBits =
 320          util_format_get_component_bits(visual->color_format,
 321                UTIL_FORMAT_COLORSPACE_RGB, 0);
 322       mode->greenBits =
 323          util_format_get_component_bits(visual->color_format,
 324                UTIL_FORMAT_COLORSPACE_RGB, 1);
 325       mode->blueBits =
 326          util_format_get_component_bits(visual->color_format,
 327                UTIL_FORMAT_COLORSPACE_RGB, 2);
 328       mode->alphaBits =
 329          util_format_get_component_bits(visual->color_format,
 330                UTIL_FORMAT_COLORSPACE_RGB, 3);
 331
 332       mode->rgbBits = mode->redBits +
 333          mode->greenBits + mode->blueBits + mode->alphaBits;
 334    }
 335
 336    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 337       mode->depthBits =
 338          util_format_get_component_bits(visual->depth_stencil_format,
 339                UTIL_FORMAT_COLORSPACE_ZS, 0);
 340       mode->stencilBits =
 341          util_format_get_component_bits(visual->depth_stencil_format,
 342                UTIL_FORMAT_COLORSPACE_ZS, 1);
 343
 344       mode->haveDepthBuffer = mode->depthBits > 0;
 345       mode->haveStencilBuffer = mode->stencilBits > 0;
 346    }
 347
 348    if (visual->accum_format != PIPE_FORMAT_NONE) {
 349       mode->haveAccumBuffer = GL_TRUE;
 350
 351       mode->accumRedBits =
 352          util_format_get_component_bits(visual->accum_format,
 353                UTIL_FORMAT_COLORSPACE_RGB, 0);
 354       mode->accumGreenBits =
 355          util_format_get_component_bits(visual->accum_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 1);
 357       mode->accumBlueBits =
 358          util_format_get_component_bits(visual->accum_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 2);
 360       mode->accumAlphaBits =
 361          util_format_get_component_bits(visual->accum_format,
 362                UTIL_FORMAT_COLORSPACE_RGB, 3);
 363    }
 364
 365    if (visual->samples) {
 366       mode->sampleBuffers = 1;
 367       mode->samples = visual->samples;
 368    }
 369 }
 370
 371 /**
 372  * Determine the default draw or read buffer from a visual.
 373  */
 374 static void
 375 st_visual_to_default_buffer(const struct st_visual *visual,
 376                             GLenum *buffer, GLint *index)
 377 {
 378    enum st_attachment_type statt;
 379    GLenum buf;
 380    gl_buffer_index idx;
 381
 382    statt = visual->render_buffer;
 383    /* do nothing if an invalid render buffer is specified */
 384    if (statt == ST_ATTACHMENT_INVALID ||
 385        !st_visual_have_buffers(visual, 1 << statt))
 386       return;
 387
 388    switch (statt) {
 389    case ST_ATTACHMENT_FRONT_LEFT:
 390       buf = GL_FRONT_LEFT;
 391       idx = BUFFER_FRONT_LEFT;
 392       break;
 393    case ST_ATTACHMENT_BACK_LEFT:
 394       buf = GL_BACK_LEFT;
 395       idx = BUFFER_BACK_LEFT;
 396       break;
 397    case ST_ATTACHMENT_FRONT_RIGHT:
 398       buf = GL_FRONT_RIGHT;
 399       idx = BUFFER_FRONT_RIGHT;
 400       break;
 401    case ST_ATTACHMENT_BACK_RIGHT:
 402       buf = GL_BACK_RIGHT;
 403       idx = BUFFER_BACK_RIGHT;
 404       break;
 405    default:
 406       buf = GL_NONE;
 407       idx = BUFFER_COUNT;
 408       break;
 409    }
 410
 411    if (buf != GL_NONE) {
 412       if (buffer)
 413          *buffer = buf;
 414       if (index)
 415          *index = idx;
 416    }
 417 }
 418
 419 /**
 420  * Create a framebuffer from a manager interface.
 421  */
 422 static struct st_framebuffer *
 423 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 424 {
 425    struct st_framebuffer *stfb;
 426    struct gl_config mode;
 427    gl_buffer_index idx;
 428
 429    stfb = CALLOC_STRUCT(st_framebuffer);
 430    if (!stfb)
 431       return NULL;
 432
 433    /* for FBO-only context */
 434    if (!stfbi) {
 435       struct gl_framebuffer *base = _mesa_get_incomplete_framebuffer();
 436
 437       stfb->Base = *base;
 438
 439       return stfb;
 440    }
 441
 442    st_visual_to_context_mode(stfbi->visual, &mode);
 443    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 444
 445    /* modify the draw/read buffers of the fb */
 446    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 447          &stfb->Base._ColorDrawBufferIndexes[0]);
 448    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 449          &stfb->Base._ColorReadBufferIndex);
 450
 451    stfb->iface = stfbi;
 452
 453    /* add the color buffer */
 454    idx = stfb->Base._ColorDrawBufferIndexes[0];
 455    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 456       FREE(stfb);
 457       return NULL;
 458    }
 459
 460    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 461    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 462
 463    st_framebuffer_update_attachments(stfb);
 464
 465    stfb->Base.Initialized = GL_TRUE;
 466
 467    return stfb;
 468 }
 469
 470 /**
 471  * Reference a framebuffer.
 472  */
 473 static void
 474 st_framebuffer_reference(struct st_framebuffer **ptr,
 475                          struct st_framebuffer *stfb)
 476 {
 477    struct gl_framebuffer *fb = &stfb->Base;
 478    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 479 }
 480
 481 static void
 482 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 483                                       struct st_framebuffer_iface *stfbi)
 484 {
 485    struct st_context *st = (struct st_context *) stctxi;
 486    struct st_framebuffer *stfb;
 487
 488    /* either draw or read winsys fb */
 489    stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 490    if (!stfb || stfb->iface != stfbi)
 491       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 492
 493    if (stfb && stfb->iface == stfbi) {
 494       p_atomic_set(&stfb->revalidate, TRUE);
 495    }
 496    else {
 497       /* This function is probably getting called when we've detected a
 498        * change in a window's size but the currently bound context is
 499        * not bound to that window.
 500        * If the st_framebuffer_iface structure had a pointer to the
 501        * corresponding st_framebuffer we'd be able to handle this.
 502        */
 503    }
 504 }
 505
 506 static void
 507 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 508                  struct pipe_fence_handle **fence)
 509 {
 510    struct st_context *st = (struct st_context *) stctxi;
 511    st_flush(st, flags, fence);
 512    if (flags & PIPE_FLUSH_RENDER_CACHE)
 513       st_manager_flush_frontbuffer(st);
 514 }
 515
 516 static boolean
 517 st_context_teximage(struct st_context_iface *stctxi,
 518                     enum st_texture_type target,
 519                     int level, enum pipe_format internal_format,
 520                     struct pipe_resource *tex, boolean mipmap)
 521 {
 522    struct st_context *st = (struct st_context *) stctxi;
 523    struct gl_context *ctx = st->ctx;
 524    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 525    struct gl_texture_object *texObj;
 526    struct gl_texture_image *texImage;
 527    struct st_texture_object *stObj;
 528    struct st_texture_image *stImage;
 529    GLenum internalFormat;
 530    GLuint width, height, depth;
 531
 532    switch (target) {
 533    case ST_TEXTURE_1D:
 534       target = GL_TEXTURE_1D;
 535       break;
 536    case ST_TEXTURE_2D:
 537       target = GL_TEXTURE_2D;
 538       break;
 539    case ST_TEXTURE_3D:
 540       target = GL_TEXTURE_3D;
 541       break;
 542    case ST_TEXTURE_RECT:
 543       target = GL_TEXTURE_RECTANGLE_ARB;
 544       break;
 545    default:
 546       return FALSE;
 547       break;
 548    }
 549
 550    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 551    _mesa_lock_texture(ctx, texObj);
 552
 553    stObj = st_texture_object(texObj);
 554    /* switch to surface based */
 555    if (!stObj->surface_based) {
 556       _mesa_clear_texture_object(ctx, texObj);
 557       stObj->surface_based = GL_TRUE;
 558    }
 559
 560    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 561    stImage = st_texture_image(texImage);
 562    if (tex) {
 563       gl_format texFormat;
 564
 565       /*
 566        * XXX When internal_format and tex->format differ, st_finalize_texture
 567        * needs to allocate a new texture with internal_format and copy the
 568        * texture here into the new one.  It will result in surface_copy being
 569        * called on surfaces whose formats differ.
 570        *
 571        * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
 572        * is to use a sampler view.
 573        */
 574       if (!st_sampler_compat_formats(tex->format, internal_format))
 575          internal_format = tex->format;
 576
 577       if (util_format_get_component_bits(internal_format,
 578                UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 579          internalFormat = GL_RGBA;
 580       else
 581          internalFormat = GL_RGB;
 582
 583       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 584                                          GL_RGBA, GL_UNSIGNED_BYTE);
 585
 586       _mesa_init_teximage_fields(ctx, target, texImage,
 587                                  tex->width0, tex->height0, 1, 0,
 588                                  internalFormat, texFormat);
 589
 590       width = tex->width0;
 591       height = tex->height0;
 592       depth = tex->depth0;
 593
 594       /* grow the image size until we hit level = 0 */
 595       while (level > 0) {
 596          if (width != 1)
 597             width <<= 1;
 598          if (height != 1)
 599             height <<= 1;
 600          if (depth != 1)
 601             depth <<= 1;
 602          level--;
 603       }
 604    }
 605    else {
 606       _mesa_clear_texture_image(ctx, texImage);
 607       width = height = depth = 0;
 608    }
 609
 610    pipe_resource_reference(&stImage->pt, tex);
 611    stObj->width0 = width;
 612    stObj->height0 = height;
 613    stObj->depth0 = depth;
 614
 615    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 616    _mesa_unlock_texture(ctx, texObj);
 617
 618    return TRUE;
 619 }
 620
 621 static void
 622 st_context_copy(struct st_context_iface *stctxi,
 623                 struct st_context_iface *stsrci, unsigned mask)
 624 {
 625    struct st_context *st = (struct st_context *) stctxi;
 626    struct st_context *src = (struct st_context *) stsrci;
 627
 628    _mesa_copy_context(src->ctx, st->ctx, mask);
 629 }
 630
 631 static boolean
 632 st_context_share(struct st_context_iface *stctxi,
 633                  struct st_context_iface *stsrci)
 634 {
 635    struct st_context *st = (struct st_context *) stctxi;
 636    struct st_context *src = (struct st_context *) stsrci;
 637
 638    return _mesa_share_state(st->ctx, src->ctx);
 639 }
 640
 641 static void
 642 st_context_destroy(struct st_context_iface *stctxi)
 643 {
 644    struct st_context *st = (struct st_context *) stctxi;
 645    st_destroy_context(st);
 646 }
 647
 648 static struct st_context_iface *
 649 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 650                       const struct st_context_attribs *attribs,
 651                       struct st_context_iface *shared_stctxi)
 652 {
 653    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 654    struct st_context *st;
 655    struct pipe_context *pipe;
 656    struct gl_config mode;
 657    gl_api api;
 658
 659    if (!(stapi->profile_mask & (1 << attribs->profile)))
 660       return NULL;
 661
 662    switch (attribs->profile) {
 663    case ST_PROFILE_DEFAULT:
 664       api = API_OPENGL;
 665       break;
 666    case ST_PROFILE_OPENGL_ES1:
 667       api = API_OPENGLES;
 668       break;
 669    case ST_PROFILE_OPENGL_ES2:
 670       api = API_OPENGLES2;
 671       break;
 672    case ST_PROFILE_OPENGL_CORE:
 673    default:
 674       return NULL;
 675       break;
 676    }
 677
 678    pipe = smapi->screen->context_create(smapi->screen, NULL);
 679    if (!pipe)
 680       return NULL;
 681
 682    st_visual_to_context_mode(&attribs->visual, &mode);
 683    st = st_create_context(api, pipe, &mode, shared_ctx);
 684    if (!st) {
 685       pipe->destroy(pipe);
 686       return NULL;
 687    }
 688
 689    /* need to perform version check */
 690    if (attribs->major > 1 || attribs->minor > 0) {
 691       _mesa_compute_version(st->ctx);
 692
 693       if (st->ctx->VersionMajor < attribs->major ||
 694           st->ctx->VersionMajor < attribs->minor) {
 695          st_destroy_context(st);
 696          return NULL;
 697       }
 698    }
 699
 700    st->invalidate_on_gl_viewport =
 701       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 702
 703    st->iface.destroy = st_context_destroy;
 704    st->iface.notify_invalid_framebuffer =
 705       st_context_notify_invalid_framebuffer;
 706    st->iface.flush = st_context_flush;
 707    st->iface.teximage = st_context_teximage;
 708    st->iface.copy = st_context_copy;
 709    st->iface.share = st_context_share;
 710    st->iface.st_context_private = (void *) smapi;
 711
 712    return &st->iface;
 713 }
 714
 715 static boolean
 716 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 717                     struct st_framebuffer_iface *stdrawi,
 718                     struct st_framebuffer_iface *streadi)
 719 {
 720    struct st_context *st = (struct st_context *) stctxi;
 721    struct st_framebuffer *stdraw, *stread, *stfb;
 722    boolean ret;
 723
 724    _glapi_check_multithread();
 725
 726    if (st) {
 727       /* reuse/create the draw fb */
 728       stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 729       if (stfb && stfb->iface == stdrawi) {
 730          stdraw = NULL;
 731          st_framebuffer_reference(&stdraw, stfb);
 732       }
 733       else {
 734          stdraw = st_framebuffer_create(stdrawi);
 735       }
 736
 737       /* reuse/create the read fb */
 738       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 739       if (!stfb || stfb->iface != streadi)
 740          stfb = stdraw;
 741       if (stfb && stfb->iface == streadi) {
 742          stread = NULL;
 743          st_framebuffer_reference(&stread, stfb);
 744       }
 745       else {
 746          stread = st_framebuffer_create(streadi);
 747       }
 748
 749       if (stdraw && stread) {
 750          st_framebuffer_validate(stdraw, st);
 751          if (stread != stdraw)
 752             st_framebuffer_validate(stread, st);
 753
 754          /* modify the draw/read buffers of the context */
 755          if (stdraw->iface) {
 756             st_visual_to_default_buffer(stdraw->iface->visual,
 757                   &st->ctx->Color.DrawBuffer[0], NULL);
 758          }
 759          if (stread->iface) {
 760             st_visual_to_default_buffer(stread->iface->visual,
 761                   &st->ctx->Pixel.ReadBuffer, NULL);
 762          }
 763
 764          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 765       }
 766       else {
 767          ret = FALSE;
 768       }
 769
 770       st_framebuffer_reference(&stdraw, NULL);
 771       st_framebuffer_reference(&stread, NULL);
 772    }
 773    else {
 774       ret = _mesa_make_current(NULL, NULL, NULL);
 775    }
 776
 777    return ret;
 778 }
 779
 780 static struct st_context_iface *
 781 st_api_get_current(struct st_api *stapi)
 782 {
 783    GET_CURRENT_CONTEXT(ctx);
 784    struct st_context *st = (ctx) ? ctx->st : NULL;
 785
 786    return (st) ? &st->iface : NULL;
 787 }
 788
 789 static st_proc_t
 790 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 791 {
 792    return (st_proc_t) _glapi_get_proc_address(procname);
 793 }
 794
 795 static void
 796 st_api_destroy(struct st_api *stapi)
 797 {
 798 }
 799
 800 /**
 801  * Flush the front buffer if the current context renders to the front buffer.
 802  */
 803 void
 804 st_manager_flush_frontbuffer(struct st_context *st)
 805 {
 806    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 807    struct st_renderbuffer *strb = NULL;
 808
 809    if (stfb)
 810       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 811    if (!strb)
 812       return;
 813
 814    /* never a dummy fb */
 815    assert(stfb->iface);
 816    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 817 }
 818
 819 /**
 820  * Return the surface of an EGLImage.
 821  * FIXME: I think this should operate on resources, not surfaces
 822  */
 823 struct pipe_surface *
 824 st_manager_get_egl_image_surface(struct st_context *st,
 825                                  void *eglimg, unsigned usage)
 826 {
 827    struct st_manager *smapi =
 828       (struct st_manager *) st->iface.st_context_private;
 829    struct st_egl_image stimg;
 830    struct pipe_surface *ps, surf_tmpl;
 831
 832    if (!smapi || !smapi->get_egl_image)
 833       return NULL;
 834
 835    memset(&stimg, 0, sizeof(stimg));
 836    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 837       return NULL;
 838
 839    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 840    surf_tmpl.format = stimg.texture->format;
 841    surf_tmpl.usage = usage;
 842    surf_tmpl.u.tex.level = stimg.level;
 843    surf_tmpl.u.tex.first_layer = stimg.layer;
 844    surf_tmpl.u.tex.last_layer = stimg.layer;
 845    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 846    pipe_resource_reference(&stimg.texture, NULL);
 847
 848    return ps;
 849 }
 850
 851 /**
 852  * Re-validate the framebuffers.
 853  */
 854 void
 855 st_manager_validate_framebuffers(struct st_context *st)
 856 {
 857    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 858    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 859
 860    if (stdraw)
 861       st_framebuffer_validate(stdraw, st);
 862    if (stread && stread != stdraw)
 863       st_framebuffer_validate(stread, st);
 864 }
 865
 866 /**
 867  * Add a color renderbuffer on demand.
 868  */
 869 boolean
 870 st_manager_add_color_renderbuffer(struct st_context *st,
 871                                   struct gl_framebuffer *fb,
 872                                   gl_buffer_index idx)
 873 {
 874    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 875
 876    /* FBO */
 877    if (!stfb)
 878       return FALSE;
 879
 880    if (stfb->Base.Attachment[idx].Renderbuffer)
 881       return TRUE;
 882
 883    switch (idx) {
 884    case BUFFER_FRONT_LEFT:
 885    case BUFFER_BACK_LEFT:
 886    case BUFFER_FRONT_RIGHT:
 887    case BUFFER_BACK_RIGHT:
 888       break;
 889    default:
 890       return FALSE;
 891       break;
 892    }
 893
 894    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 895       return FALSE;
 896
 897    st_framebuffer_update_attachments(stfb);
 898    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 899
 900    return TRUE;
 901 }
 902
 903 static const struct st_api st_gl_api = {
 904    "Mesa " MESA_VERSION_STRING,
 905    ST_API_OPENGL,
 906 #if FEATURE_GL
 907    ST_PROFILE_DEFAULT_MASK |
 908 #endif
 909 #if FEATURE_ES1
 910    ST_PROFILE_OPENGL_ES1_MASK |
 911 #endif
 912 #if FEATURE_ES2
 913    ST_PROFILE_OPENGL_ES2_MASK |
 914 #endif
 915    0,
 916    st_api_destroy,
 917    st_api_get_proc_address,
 918    st_api_create_context,
 919    st_api_make_current,
 920    st_api_get_current,
 921 };
 922
 923 struct st_api *
 924 st_gl_api_create(void)
 925 {
 926    return (struct st_api *) &st_gl_api;
 927 }