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    if (!stfbi)
 430       return NULL;
 431
 432    stfb = CALLOC_STRUCT(st_framebuffer);
 433    if (!stfb)
 434       return NULL;
 435
 436    st_visual_to_context_mode(stfbi->visual, &mode);
 437    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 438
 439    /* modify the draw/read buffers of the fb */
 440    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 441          &stfb->Base._ColorDrawBufferIndexes[0]);
 442    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 443          &stfb->Base._ColorReadBufferIndex);
 444
 445    stfb->iface = stfbi;
 446
 447    /* add the color buffer */
 448    idx = stfb->Base._ColorDrawBufferIndexes[0];
 449    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 450       FREE(stfb);
 451       return NULL;
 452    }
 453
 454    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 455    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 456
 457    st_framebuffer_update_attachments(stfb);
 458
 459    stfb->Base.Initialized = GL_TRUE;
 460
 461    return stfb;
 462 }
 463
 464 /**
 465  * Reference a framebuffer.
 466  */
 467 static void
 468 st_framebuffer_reference(struct st_framebuffer **ptr,
 469                          struct st_framebuffer *stfb)
 470 {
 471    struct gl_framebuffer *fb = &stfb->Base;
 472    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 473 }
 474
 475 static void
 476 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 477                                       struct st_framebuffer_iface *stfbi)
 478 {
 479    struct st_context *st = (struct st_context *) stctxi;
 480    struct st_framebuffer *stfb;
 481
 482    /* either draw or read winsys fb */
 483    stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
 484    if (!stfb || stfb->iface != stfbi)
 485       stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
 486
 487    if (stfb && stfb->iface == stfbi) {
 488       p_atomic_set(&stfb->revalidate, TRUE);
 489    }
 490    else {
 491       /* This function is probably getting called when we've detected a
 492        * change in a window's size but the currently bound context is
 493        * not bound to that window.
 494        * If the st_framebuffer_iface structure had a pointer to the
 495        * corresponding st_framebuffer we'd be able to handle this.
 496        */
 497    }
 498 }
 499
 500 static void
 501 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 502                  struct pipe_fence_handle **fence)
 503 {
 504    struct st_context *st = (struct st_context *) stctxi;
 505    st_flush(st, fence);
 506    if (flags & ST_FLUSH_FRONT)
 507       st_manager_flush_frontbuffer(st);
 508 }
 509
 510 static boolean
 511 st_context_teximage(struct st_context_iface *stctxi,
 512                     enum st_texture_type target,
 513                     int level, enum pipe_format internal_format,
 514                     struct pipe_resource *tex, boolean mipmap)
 515 {
 516    struct st_context *st = (struct st_context *) stctxi;
 517    struct gl_context *ctx = st->ctx;
 518    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 519    struct gl_texture_object *texObj;
 520    struct gl_texture_image *texImage;
 521    struct st_texture_object *stObj;
 522    struct st_texture_image *stImage;
 523    GLenum internalFormat;
 524    GLuint width, height, depth;
 525
 526    switch (target) {
 527    case ST_TEXTURE_1D:
 528       target = GL_TEXTURE_1D;
 529       break;
 530    case ST_TEXTURE_2D:
 531       target = GL_TEXTURE_2D;
 532       break;
 533    case ST_TEXTURE_3D:
 534       target = GL_TEXTURE_3D;
 535       break;
 536    case ST_TEXTURE_RECT:
 537       target = GL_TEXTURE_RECTANGLE_ARB;
 538       break;
 539    default:
 540       return FALSE;
 541       break;
 542    }
 543
 544    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 545    _mesa_lock_texture(ctx, texObj);
 546
 547    stObj = st_texture_object(texObj);
 548    /* switch to surface based */
 549    if (!stObj->surface_based) {
 550       _mesa_clear_texture_object(ctx, texObj);
 551       stObj->surface_based = GL_TRUE;
 552    }
 553
 554    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 555    stImage = st_texture_image(texImage);
 556    if (tex) {
 557       gl_format texFormat;
 558
 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
 577       texFormat = st_ChooseTextureFormat(ctx, internalFormat,
 578                                          GL_RGBA, GL_UNSIGNED_BYTE);
 579
 580       _mesa_init_teximage_fields(ctx, target, texImage,
 581                                  tex->width0, tex->height0, 1, 0,
 582                                  internalFormat, texFormat);
 583
 584       width = tex->width0;
 585       height = tex->height0;
 586       depth = tex->depth0;
 587
 588       /* grow the image size until we hit level = 0 */
 589       while (level > 0) {
 590          if (width != 1)
 591             width <<= 1;
 592          if (height != 1)
 593             height <<= 1;
 594          if (depth != 1)
 595             depth <<= 1;
 596          level--;
 597       }
 598    }
 599    else {
 600       _mesa_clear_texture_image(ctx, texImage);
 601       width = height = depth = 0;
 602    }
 603
 604    pipe_resource_reference(&stImage->pt, tex);
 605    stObj->width0 = width;
 606    stObj->height0 = height;
 607    stObj->depth0 = depth;
 608
 609    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 610    _mesa_unlock_texture(ctx, texObj);
 611
 612    return TRUE;
 613 }
 614
 615 static void
 616 st_context_copy(struct st_context_iface *stctxi,
 617                 struct st_context_iface *stsrci, unsigned mask)
 618 {
 619    struct st_context *st = (struct st_context *) stctxi;
 620    struct st_context *src = (struct st_context *) stsrci;
 621
 622    _mesa_copy_context(src->ctx, st->ctx, mask);
 623 }
 624
 625 static boolean
 626 st_context_share(struct st_context_iface *stctxi,
 627                  struct st_context_iface *stsrci)
 628 {
 629    struct st_context *st = (struct st_context *) stctxi;
 630    struct st_context *src = (struct st_context *) stsrci;
 631
 632    return _mesa_share_state(st->ctx, src->ctx);
 633 }
 634
 635 static void
 636 st_context_destroy(struct st_context_iface *stctxi)
 637 {
 638    struct st_context *st = (struct st_context *) stctxi;
 639    st_destroy_context(st);
 640 }
 641
 642 static struct st_context_iface *
 643 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 644                       const struct st_context_attribs *attribs,
 645                       struct st_context_iface *shared_stctxi)
 646 {
 647    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 648    struct st_context *st;
 649    struct pipe_context *pipe;
 650    struct gl_config mode;
 651    gl_api api;
 652
 653    if (!(stapi->profile_mask & (1 << attribs->profile)))
 654       return NULL;
 655
 656    switch (attribs->profile) {
 657    case ST_PROFILE_DEFAULT:
 658       api = API_OPENGL;
 659       break;
 660    case ST_PROFILE_OPENGL_ES1:
 661       api = API_OPENGLES;
 662       break;
 663    case ST_PROFILE_OPENGL_ES2:
 664       api = API_OPENGLES2;
 665       break;
 666    case ST_PROFILE_OPENGL_CORE:
 667    default:
 668       return NULL;
 669       break;
 670    }
 671
 672    pipe = smapi->screen->context_create(smapi->screen, NULL);
 673    if (!pipe)
 674       return NULL;
 675
 676    st_visual_to_context_mode(&attribs->visual, &mode);
 677    st = st_create_context(api, pipe, &mode, shared_ctx);
 678    if (!st) {
 679       pipe->destroy(pipe);
 680       return NULL;
 681    }
 682
 683    /* need to perform version check */
 684    if (attribs->major > 1 || attribs->minor > 0) {
 685       _mesa_compute_version(st->ctx);
 686
 687       /* is the actual version less than the requested version? */
 688       if (st->ctx->VersionMajor * 10 + st->ctx->VersionMinor <
 689           attribs->major * 10 + attribs->minor) {
 690          st_destroy_context(st);
 691          return NULL;
 692       }
 693    }
 694
 695    st->invalidate_on_gl_viewport =
 696       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 697
 698    st->iface.destroy = st_context_destroy;
 699    st->iface.notify_invalid_framebuffer =
 700       st_context_notify_invalid_framebuffer;
 701    st->iface.flush = st_context_flush;
 702    st->iface.teximage = st_context_teximage;
 703    st->iface.copy = st_context_copy;
 704    st->iface.share = st_context_share;
 705    st->iface.st_context_private = (void *) smapi;
 706
 707    return &st->iface;
 708 }
 709
 710 static struct st_context_iface *
 711 st_api_get_current(struct st_api *stapi)
 712 {
 713    GET_CURRENT_CONTEXT(ctx);
 714    struct st_context *st = (ctx) ? ctx->st : NULL;
 715
 716    return (st) ? &st->iface : NULL;
 717 }
 718
 719 static struct st_framebuffer *
 720 st_framebuffer_reuse_or_create(struct gl_framebuffer *fb,
 721                                struct st_framebuffer_iface *stfbi)
 722 {
 723    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 724
 725    if (cur && cur->iface == stfbi) {
 726       /* reuse the current stfb */
 727       st_framebuffer_reference(&stfb, cur);
 728    }
 729    else {
 730       /* create a new one */
 731       stfb = st_framebuffer_create(stfbi);
 732    }
 733
 734    return stfb;
 735 }
 736
 737 static boolean
 738 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 739                     struct st_framebuffer_iface *stdrawi,
 740                     struct st_framebuffer_iface *streadi)
 741 {
 742    struct st_context *st = (struct st_context *) stctxi;
 743    struct st_framebuffer *stdraw, *stread;
 744    boolean ret;
 745
 746    _glapi_check_multithread();
 747
 748    if (st) {
 749       /* reuse or create the draw fb */
 750       stdraw = st_framebuffer_reuse_or_create(st->ctx->WinSysDrawBuffer,
 751                                               stdrawi);
 752       if (streadi != stdrawi) {
 753          /* do the same for the read fb */
 754          stread = st_framebuffer_reuse_or_create(st->ctx->WinSysReadBuffer,
 755                                                  streadi);
 756       }
 757       else {
 758          stread = NULL;
 759          /* reuse the draw fb for the read fb */
 760          if (stdraw)
 761             st_framebuffer_reference(&stread, stdraw);
 762       }
 763
 764       if (stdraw && stread) {
 765          if (stctxi != st_api_get_current(stapi)) {
 766             p_atomic_set(&stdraw->revalidate, TRUE);
 767             p_atomic_set(&stread->revalidate, TRUE);
 768          }
 769          st_framebuffer_validate(stdraw, st);
 770          if (stread != stdraw)
 771             st_framebuffer_validate(stread, st);
 772
 773          /* modify the draw/read buffers of the context */
 774          if (stdraw->iface) {
 775             st_visual_to_default_buffer(stdraw->iface->visual,
 776                   &st->ctx->Color.DrawBuffer[0], NULL);
 777          }
 778          if (stread->iface) {
 779             st_visual_to_default_buffer(stread->iface->visual,
 780                   &st->ctx->Pixel.ReadBuffer, NULL);
 781          }
 782
 783          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 784       }
 785       else {
 786          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 787          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 788       }
 789
 790       st_framebuffer_reference(&stdraw, NULL);
 791       st_framebuffer_reference(&stread, NULL);
 792    }
 793    else {
 794       ret = _mesa_make_current(NULL, NULL, NULL);
 795    }
 796
 797    return ret;
 798 }
 799
 800 static st_proc_t
 801 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 802 {
 803    return (st_proc_t) _glapi_get_proc_address(procname);
 804 }
 805
 806 static void
 807 st_api_destroy(struct st_api *stapi)
 808 {
 809 }
 810
 811 /**
 812  * Flush the front buffer if the current context renders to the front buffer.
 813  */
 814 void
 815 st_manager_flush_frontbuffer(struct st_context *st)
 816 {
 817    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 818    struct st_renderbuffer *strb = NULL;
 819
 820    if (stfb)
 821       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 822    if (!strb)
 823       return;
 824
 825    /* never a dummy fb */
 826    assert(stfb->iface);
 827    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 828 }
 829
 830 /**
 831  * Return the surface of an EGLImage.
 832  * FIXME: I think this should operate on resources, not surfaces
 833  */
 834 struct pipe_surface *
 835 st_manager_get_egl_image_surface(struct st_context *st,
 836                                  void *eglimg, unsigned usage)
 837 {
 838    struct st_manager *smapi =
 839       (struct st_manager *) st->iface.st_context_private;
 840    struct st_egl_image stimg;
 841    struct pipe_surface *ps, surf_tmpl;
 842
 843    if (!smapi || !smapi->get_egl_image)
 844       return NULL;
 845
 846    memset(&stimg, 0, sizeof(stimg));
 847    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 848       return NULL;
 849
 850    memset(&surf_tmpl, 0, sizeof(surf_tmpl));
 851    surf_tmpl.format = stimg.texture->format;
 852    surf_tmpl.usage = usage;
 853    surf_tmpl.u.tex.level = stimg.level;
 854    surf_tmpl.u.tex.first_layer = stimg.layer;
 855    surf_tmpl.u.tex.last_layer = stimg.layer;
 856    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 857    pipe_resource_reference(&stimg.texture, NULL);
 858
 859    return ps;
 860 }
 861
 862 /**
 863  * Re-validate the framebuffers.
 864  */
 865 void
 866 st_manager_validate_framebuffers(struct st_context *st)
 867 {
 868    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 869    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 870
 871    if (stdraw)
 872       st_framebuffer_validate(stdraw, st);
 873    if (stread && stread != stdraw)
 874       st_framebuffer_validate(stread, st);
 875 }
 876
 877 /**
 878  * Add a color renderbuffer on demand.
 879  */
 880 boolean
 881 st_manager_add_color_renderbuffer(struct st_context *st,
 882                                   struct gl_framebuffer *fb,
 883                                   gl_buffer_index idx)
 884 {
 885    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 886
 887    /* FBO */
 888    if (!stfb)
 889       return FALSE;
 890
 891    if (stfb->Base.Attachment[idx].Renderbuffer)
 892       return TRUE;
 893
 894    switch (idx) {
 895    case BUFFER_FRONT_LEFT:
 896    case BUFFER_BACK_LEFT:
 897    case BUFFER_FRONT_RIGHT:
 898    case BUFFER_BACK_RIGHT:
 899       break;
 900    default:
 901       return FALSE;
 902       break;
 903    }
 904
 905    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 906       return FALSE;
 907
 908    st_framebuffer_update_attachments(stfb);
 909    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 910
 911    return TRUE;
 912 }
 913
 914 static const struct st_api st_gl_api = {
 915    "Mesa " MESA_VERSION_STRING,
 916    ST_API_OPENGL,
 917 #if FEATURE_GL
 918    ST_PROFILE_DEFAULT_MASK |
 919 #endif
 920 #if FEATURE_ES1
 921    ST_PROFILE_OPENGL_ES1_MASK |
 922 #endif
 923 #if FEATURE_ES2
 924    ST_PROFILE_OPENGL_ES2_MASK |
 925 #endif
 926    0,
 927    st_api_destroy,
 928    st_api_get_proc_address,
 929    st_api_create_context,
 930    st_api_make_current,
 931    st_api_get_current,
 932 };
 933
 934 struct st_api *
 935 st_gl_api_create(void)
 936 {
 937    return (struct st_api *) &st_gl_api;
 938 }