src/mesa/state_tracker/st_manager.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 2010 LunarG Inc.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Chia-I Wu <olv@lunarg.com>
  26  */
  27
  28 #include "main/mtypes.h"
  29 #include "main/extensions.h"
  30 #include "main/context.h"
  31 #include "main/debug_output.h"
  32 #include "main/glthread.h"
  33 #include "main/texobj.h"
  34 #include "main/teximage.h"
  35 #include "main/texstate.h"
  36 #include "main/errors.h"
  37 #include "main/framebuffer.h"
  38 #include "main/fbobject.h"
  39 #include "main/renderbuffer.h"
  40 #include "main/version.h"
  41 #include "st_texture.h"
  42
  43 #include "st_context.h"
  44 #include "st_debug.h"
  45 #include "st_extensions.h"
  46 #include "st_format.h"
  47 #include "st_cb_fbo.h"
  48 #include "st_cb_flush.h"
  49 #include "st_manager.h"
  50
  51 #include "state_tracker/st_gl_api.h"
  52
  53 #include "pipe/p_context.h"
  54 #include "pipe/p_screen.h"
  55 #include "util/u_format.h"
  56 #include "util/u_pointer.h"
  57 #include "util/u_inlines.h"
  58 #include "util/u_atomic.h"
  59 #include "util/u_surface.h"
  60
  61
  62 /**
  63  * Map an attachment to a buffer index.
  64  */
  65 static inline gl_buffer_index
  66 attachment_to_buffer_index(enum st_attachment_type statt)
  67 {
  68    gl_buffer_index index;
  69
  70    switch (statt) {
  71    case ST_ATTACHMENT_FRONT_LEFT:
  72       index = BUFFER_FRONT_LEFT;
  73       break;
  74    case ST_ATTACHMENT_BACK_LEFT:
  75       index = BUFFER_BACK_LEFT;
  76       break;
  77    case ST_ATTACHMENT_FRONT_RIGHT:
  78       index = BUFFER_FRONT_RIGHT;
  79       break;
  80    case ST_ATTACHMENT_BACK_RIGHT:
  81       index = BUFFER_BACK_RIGHT;
  82       break;
  83    case ST_ATTACHMENT_DEPTH_STENCIL:
  84       index = BUFFER_DEPTH;
  85       break;
  86    case ST_ATTACHMENT_ACCUM:
  87       index = BUFFER_ACCUM;
  88       break;
  89    case ST_ATTACHMENT_SAMPLE:
  90    default:
  91       index = BUFFER_COUNT;
  92       break;
  93    }
  94
  95    return index;
  96 }
  97
  98 /**
  99  * Map a buffer index to an attachment.
 100  */
 101 static inline enum st_attachment_type
 102 buffer_index_to_attachment(gl_buffer_index index)
 103 {
 104    enum st_attachment_type statt;
 105
 106    switch (index) {
 107    case BUFFER_FRONT_LEFT:
 108       statt = ST_ATTACHMENT_FRONT_LEFT;
 109       break;
 110    case BUFFER_BACK_LEFT:
 111       statt = ST_ATTACHMENT_BACK_LEFT;
 112       break;
 113    case BUFFER_FRONT_RIGHT:
 114       statt = ST_ATTACHMENT_FRONT_RIGHT;
 115       break;
 116    case BUFFER_BACK_RIGHT:
 117       statt = ST_ATTACHMENT_BACK_RIGHT;
 118       break;
 119    case BUFFER_DEPTH:
 120       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 121       break;
 122    case BUFFER_ACCUM:
 123       statt = ST_ATTACHMENT_ACCUM;
 124       break;
 125    default:
 126       statt = ST_ATTACHMENT_INVALID;
 127       break;
 128    }
 129
 130    return statt;
 131 }
 132
 133 /**
 134  * Make sure a context picks up the latest cached state of the
 135  * drawables it binds to.
 136  */
 137 static void
 138 st_context_validate(struct st_context *st,
 139                     struct st_framebuffer *stdraw,
 140                     struct st_framebuffer *stread)
 141 {
 142     if (stdraw && stdraw->stamp != st->draw_stamp) {
 143        st->dirty |= ST_NEW_FRAMEBUFFER;
 144        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 145                                 stdraw->Base.Width,
 146                                 stdraw->Base.Height);
 147        st->draw_stamp = stdraw->stamp;
 148     }
 149
 150     if (stread && stread->stamp != st->read_stamp) {
 151        if (stread != stdraw) {
 152           st->dirty |= ST_NEW_FRAMEBUFFER;
 153           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 154                                    stread->Base.Width,
 155                                    stread->Base.Height);
 156        }
 157        st->read_stamp = stread->stamp;
 158     }
 159 }
 160
 161 /**
 162  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 163  * The context is only used for creating pipe surfaces and for calling
 164  * _mesa_resize_framebuffer().
 165  * (That should probably be rethought, since those surfaces become
 166  * drawable state, not context state, and can be freed by another pipe
 167  * context).
 168  */
 169 static void
 170 st_framebuffer_validate(struct st_framebuffer *stfb,
 171                         struct st_context *st)
 172 {
 173    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 174    uint width, height;
 175    unsigned i;
 176    boolean changed = FALSE;
 177    int32_t new_stamp;
 178
 179    new_stamp = p_atomic_read(&stfb->iface->stamp);
 180    if (stfb->iface_stamp == new_stamp)
 181       return;
 182
 183    /* validate the fb */
 184    do {
 185       if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,
 186                                  stfb->num_statts, textures))
 187          return;
 188
 189       stfb->iface_stamp = new_stamp;
 190       new_stamp = p_atomic_read(&stfb->iface->stamp);
 191    } while(stfb->iface_stamp != new_stamp);
 192
 193    width = stfb->Base.Width;
 194    height = stfb->Base.Height;
 195
 196    for (i = 0; i < stfb->num_statts; i++) {
 197       struct st_renderbuffer *strb;
 198       struct pipe_surface *ps, surf_tmpl;
 199       gl_buffer_index idx;
 200
 201       if (!textures[i])
 202          continue;
 203
 204       idx = attachment_to_buffer_index(stfb->statts[i]);
 205       if (idx >= BUFFER_COUNT) {
 206          pipe_resource_reference(&textures[i], NULL);
 207          continue;
 208       }
 209
 210       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 211       assert(strb);
 212       if (strb->texture == textures[i]) {
 213          pipe_resource_reference(&textures[i], NULL);
 214          continue;
 215       }
 216
 217       u_surface_default_template(&surf_tmpl, textures[i]);
 218       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 219       if (ps) {
 220          struct pipe_surface **psurf =
 221             util_format_is_srgb(ps->format) ? &strb->surface_srgb :
 222                                               &strb->surface_linear;
 223
 224          pipe_surface_reference(psurf, ps);
 225          strb->surface = *psurf;
 226          pipe_resource_reference(&strb->texture, ps->texture);
 227          /* ownership transfered */
 228          pipe_surface_reference(&ps, NULL);
 229
 230          changed = TRUE;
 231
 232          strb->Base.Width = strb->surface->width;
 233          strb->Base.Height = strb->surface->height;
 234
 235          width = strb->Base.Width;
 236          height = strb->Base.Height;
 237       }
 238
 239       pipe_resource_reference(&textures[i], NULL);
 240    }
 241
 242    if (changed) {
 243       ++stfb->stamp;
 244       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 245    }
 246 }
 247
 248 /**
 249  * Update the attachments to validate by looping the existing renderbuffers.
 250  */
 251 static void
 252 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 253 {
 254    gl_buffer_index idx;
 255
 256    stfb->num_statts = 0;
 257    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 258       struct st_renderbuffer *strb;
 259       enum st_attachment_type statt;
 260
 261       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 262       if (!strb || strb->software)
 263          continue;
 264
 265       statt = buffer_index_to_attachment(idx);
 266       if (statt != ST_ATTACHMENT_INVALID &&
 267           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 268          stfb->statts[stfb->num_statts++] = statt;
 269    }
 270    stfb->stamp++;
 271 }
 272
 273 /**
 274  * Add a renderbuffer to the framebuffer.  The framebuffer is one that
 275  * corresponds to a window and is not a user-created FBO.
 276  */
 277 static boolean
 278 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 279                                 gl_buffer_index idx)
 280 {
 281    struct gl_renderbuffer *rb;
 282    enum pipe_format format;
 283    boolean sw;
 284
 285    assert(_mesa_is_winsys_fbo(&stfb->Base));
 286
 287    /* do not distinguish depth/stencil buffers */
 288    if (idx == BUFFER_STENCIL)
 289       idx = BUFFER_DEPTH;
 290
 291    switch (idx) {
 292    case BUFFER_DEPTH:
 293       format = stfb->iface->visual->depth_stencil_format;
 294       sw = FALSE;
 295       break;
 296    case BUFFER_ACCUM:
 297       format = stfb->iface->visual->accum_format;
 298       sw = TRUE;
 299       break;
 300    default:
 301       format = stfb->iface->visual->color_format;
 302       if (stfb->Base.Visual.sRGBCapable)
 303          format = util_format_srgb(format);
 304       sw = FALSE;
 305       break;
 306    }
 307
 308    if (format == PIPE_FORMAT_NONE)
 309       return FALSE;
 310
 311    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 312    if (!rb)
 313       return FALSE;
 314
 315    if (idx != BUFFER_DEPTH) {
 316       _mesa_attach_and_own_rb(&stfb->Base, idx, rb);
 317       return TRUE;
 318    }
 319
 320    bool rb_ownership_taken = false;
 321    if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0)) {
 322       _mesa_attach_and_own_rb(&stfb->Base, BUFFER_DEPTH, rb);
 323       rb_ownership_taken = true;
 324    }
 325
 326    if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1)) {
 327       if (rb_ownership_taken)
 328          _mesa_attach_and_reference_rb(&stfb->Base, BUFFER_STENCIL, rb);
 329       else
 330          _mesa_attach_and_own_rb(&stfb->Base, BUFFER_STENCIL, rb);
 331    }
 332
 333    return TRUE;
 334 }
 335
 336 /**
 337  * Intialize a struct gl_config from a visual.
 338  */
 339 static void
 340 st_visual_to_context_mode(const struct st_visual *visual,
 341                           struct gl_config *mode)
 342 {
 343    memset(mode, 0, sizeof(*mode));
 344
 345    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 346       mode->doubleBufferMode = GL_TRUE;
 347    if (st_visual_have_buffers(visual,
 348             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 349       mode->stereoMode = GL_TRUE;
 350
 351    if (visual->color_format != PIPE_FORMAT_NONE) {
 352       mode->rgbMode = GL_TRUE;
 353
 354       mode->redBits =
 355          util_format_get_component_bits(visual->color_format,
 356                UTIL_FORMAT_COLORSPACE_RGB, 0);
 357       mode->greenBits =
 358          util_format_get_component_bits(visual->color_format,
 359                UTIL_FORMAT_COLORSPACE_RGB, 1);
 360       mode->blueBits =
 361          util_format_get_component_bits(visual->color_format,
 362                UTIL_FORMAT_COLORSPACE_RGB, 2);
 363       mode->alphaBits =
 364          util_format_get_component_bits(visual->color_format,
 365                UTIL_FORMAT_COLORSPACE_RGB, 3);
 366
 367       mode->rgbBits = mode->redBits +
 368          mode->greenBits + mode->blueBits + mode->alphaBits;
 369       mode->sRGBCapable = util_format_is_srgb(visual->color_format);
 370    }
 371
 372    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 373       mode->depthBits =
 374          util_format_get_component_bits(visual->depth_stencil_format,
 375                UTIL_FORMAT_COLORSPACE_ZS, 0);
 376       mode->stencilBits =
 377          util_format_get_component_bits(visual->depth_stencil_format,
 378                UTIL_FORMAT_COLORSPACE_ZS, 1);
 379
 380       mode->haveDepthBuffer = mode->depthBits > 0;
 381       mode->haveStencilBuffer = mode->stencilBits > 0;
 382    }
 383
 384    if (visual->accum_format != PIPE_FORMAT_NONE) {
 385       mode->haveAccumBuffer = GL_TRUE;
 386
 387       mode->accumRedBits =
 388          util_format_get_component_bits(visual->accum_format,
 389                UTIL_FORMAT_COLORSPACE_RGB, 0);
 390       mode->accumGreenBits =
 391          util_format_get_component_bits(visual->accum_format,
 392                UTIL_FORMAT_COLORSPACE_RGB, 1);
 393       mode->accumBlueBits =
 394          util_format_get_component_bits(visual->accum_format,
 395                UTIL_FORMAT_COLORSPACE_RGB, 2);
 396       mode->accumAlphaBits =
 397          util_format_get_component_bits(visual->accum_format,
 398                UTIL_FORMAT_COLORSPACE_RGB, 3);
 399    }
 400
 401    if (visual->samples > 1) {
 402       mode->sampleBuffers = 1;
 403       mode->samples = visual->samples;
 404    }
 405 }
 406
 407 /**
 408  * Create a framebuffer from a manager interface.
 409  */
 410 static struct st_framebuffer *
 411 st_framebuffer_create(struct st_context *st,
 412                       struct st_framebuffer_iface *stfbi)
 413 {
 414    struct st_framebuffer *stfb;
 415    struct gl_config mode;
 416    gl_buffer_index idx;
 417
 418    if (!stfbi)
 419       return NULL;
 420
 421    stfb = CALLOC_STRUCT(st_framebuffer);
 422    if (!stfb)
 423       return NULL;
 424
 425    st_visual_to_context_mode(stfbi->visual, &mode);
 426
 427    /*
 428     * For desktop GL, sRGB framebuffer write is controlled by both the
 429     * capability of the framebuffer and GL_FRAMEBUFFER_SRGB.  We should
 430     * advertise the capability when the pipe driver (and core Mesa) supports
 431     * it so that applications can enable sRGB write when they want to.
 432     *
 433     * This is not to be confused with GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB.  When
 434     * the attribute is GLX_TRUE, it tells the st manager to pick a color
 435     * format such that util_format_srgb(visual->color_format) can be supported
 436     * by the pipe driver.  We still need to advertise the capability here.
 437     *
 438     * For GLES, however, sRGB framebuffer write is controlled only by the
 439     * capability of the framebuffer.  There is GL_EXT_sRGB_write_control to
 440     * give applications the control back, but sRGB write is still enabled by
 441     * default.  To avoid unexpected results, we should not advertise the
 442     * capability.  This could change when we add support for
 443     * EGL_KHR_gl_colorspace.
 444     */
 445    if (_mesa_is_desktop_gl(st->ctx)) {
 446       struct pipe_screen *screen = st->pipe->screen;
 447       const enum pipe_format srgb_format =
 448          util_format_srgb(stfbi->visual->color_format);
 449
 450       if (srgb_format != PIPE_FORMAT_NONE &&
 451           st_pipe_format_to_mesa_format(srgb_format) != MESA_FORMAT_NONE &&
 452           screen->is_format_supported(screen, srgb_format,
 453                                       PIPE_TEXTURE_2D, stfbi->visual->samples,
 454                                       (PIPE_BIND_DISPLAY_TARGET |
 455                                        PIPE_BIND_RENDER_TARGET)))
 456          mode.sRGBCapable = GL_TRUE;
 457    }
 458
 459    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 460
 461    stfb->iface = stfbi;
 462    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 463
 464    /* add the color buffer */
 465    idx = stfb->Base._ColorDrawBufferIndexes[0];
 466    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 467       free(stfb);
 468       return NULL;
 469    }
 470
 471    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 472    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 473
 474    stfb->stamp = 0;
 475    st_framebuffer_update_attachments(stfb);
 476
 477    return stfb;
 478 }
 479
 480 /**
 481  * Reference a framebuffer.
 482  */
 483 static void
 484 st_framebuffer_reference(struct st_framebuffer **ptr,
 485                          struct st_framebuffer *stfb)
 486 {
 487    struct gl_framebuffer *fb = &stfb->Base;
 488    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 489 }
 490
 491 static void
 492 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 493                  struct pipe_fence_handle **fence)
 494 {
 495    struct st_context *st = (struct st_context *) stctxi;
 496    unsigned pipe_flags = 0;
 497
 498    if (flags & ST_FLUSH_END_OF_FRAME) {
 499       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 500    }
 501
 502    st_flush(st, fence, pipe_flags);
 503
 504    if ((flags & ST_FLUSH_WAIT) && fence) {
 505       st->pipe->screen->fence_finish(st->pipe->screen, NULL, *fence,
 506                                      PIPE_TIMEOUT_INFINITE);
 507       st->pipe->screen->fence_reference(st->pipe->screen, fence, NULL);
 508    }
 509
 510    if (flags & ST_FLUSH_FRONT)
 511       st_manager_flush_frontbuffer(st);
 512 }
 513
 514 static boolean
 515 st_context_teximage(struct st_context_iface *stctxi,
 516                     enum st_texture_type tex_type,
 517                     int level, enum pipe_format pipe_format,
 518                     struct pipe_resource *tex, boolean mipmap)
 519 {
 520    struct st_context *st = (struct st_context *) stctxi;
 521    struct gl_context *ctx = st->ctx;
 522    struct gl_texture_object *texObj;
 523    struct gl_texture_image *texImage;
 524    struct st_texture_object *stObj;
 525    struct st_texture_image *stImage;
 526    GLenum internalFormat;
 527    GLuint width, height, depth;
 528    GLenum target;
 529
 530    switch (tex_type) {
 531    case ST_TEXTURE_1D:
 532       target = GL_TEXTURE_1D;
 533       break;
 534    case ST_TEXTURE_2D:
 535       target = GL_TEXTURE_2D;
 536       break;
 537    case ST_TEXTURE_3D:
 538       target = GL_TEXTURE_3D;
 539       break;
 540    case ST_TEXTURE_RECT:
 541       target = GL_TEXTURE_RECTANGLE_ARB;
 542       break;
 543    default:
 544       return FALSE;
 545    }
 546
 547    texObj = _mesa_get_current_tex_object(ctx, target);
 548
 549    _mesa_lock_texture(ctx, texObj);
 550
 551    stObj = st_texture_object(texObj);
 552    /* switch to surface based */
 553    if (!stObj->surface_based) {
 554       _mesa_clear_texture_object(ctx, texObj);
 555       stObj->surface_based = GL_TRUE;
 556    }
 557
 558    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 559    stImage = st_texture_image(texImage);
 560    if (tex) {
 561       mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
 562
 563       if (util_format_has_alpha(tex->format))
 564          internalFormat = GL_RGBA;
 565       else
 566          internalFormat = GL_RGB;
 567
 568       _mesa_init_teximage_fields(ctx, texImage,
 569                                  tex->width0, tex->height0, 1, 0,
 570                                  internalFormat, texFormat);
 571
 572       width = tex->width0;
 573       height = tex->height0;
 574       depth = tex->depth0;
 575
 576       /* grow the image size until we hit level = 0 */
 577       while (level > 0) {
 578          if (width != 1)
 579             width <<= 1;
 580          if (height != 1)
 581             height <<= 1;
 582          if (depth != 1)
 583             depth <<= 1;
 584          level--;
 585       }
 586    }
 587    else {
 588       _mesa_clear_texture_image(ctx, texImage);
 589       width = height = depth = 0;
 590    }
 591
 592    pipe_resource_reference(&stImage->pt, tex);
 593    stObj->surface_format = pipe_format;
 594
 595    _mesa_dirty_texobj(ctx, texObj);
 596    _mesa_unlock_texture(ctx, texObj);
 597
 598    return TRUE;
 599 }
 600
 601 static void
 602 st_context_copy(struct st_context_iface *stctxi,
 603                 struct st_context_iface *stsrci, unsigned mask)
 604 {
 605    struct st_context *st = (struct st_context *) stctxi;
 606    struct st_context *src = (struct st_context *) stsrci;
 607
 608    _mesa_copy_context(src->ctx, st->ctx, mask);
 609 }
 610
 611 static boolean
 612 st_context_share(struct st_context_iface *stctxi,
 613                  struct st_context_iface *stsrci)
 614 {
 615    struct st_context *st = (struct st_context *) stctxi;
 616    struct st_context *src = (struct st_context *) stsrci;
 617
 618    return _mesa_share_state(st->ctx, src->ctx);
 619 }
 620
 621 static void
 622 st_context_destroy(struct st_context_iface *stctxi)
 623 {
 624    struct st_context *st = (struct st_context *) stctxi;
 625    st_destroy_context(st);
 626 }
 627
 628 static void
 629 st_start_thread(struct st_context_iface *stctxi)
 630 {
 631    struct st_context *st = (struct st_context *) stctxi;
 632
 633    _mesa_glthread_init(st->ctx);
 634 }
 635
 636 static void
 637 st_thread_finish(struct st_context_iface *stctxi)
 638 {
 639    struct st_context *st = (struct st_context *) stctxi;
 640
 641    _mesa_glthread_finish(st->ctx);
 642 }
 643
 644 static struct st_context_iface *
 645 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 646                       const struct st_context_attribs *attribs,
 647                       enum st_context_error *error,
 648                       struct st_context_iface *shared_stctxi)
 649 {
 650    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 651    struct st_context *st;
 652    struct pipe_context *pipe;
 653    struct gl_config mode;
 654    gl_api api;
 655    unsigned ctx_flags = PIPE_CONTEXT_PREFER_THREADED;
 656
 657    if (!(stapi->profile_mask & (1 << attribs->profile)))
 658       return NULL;
 659
 660    switch (attribs->profile) {
 661    case ST_PROFILE_DEFAULT:
 662       api = API_OPENGL_COMPAT;
 663       break;
 664    case ST_PROFILE_OPENGL_ES1:
 665       api = API_OPENGLES;
 666       break;
 667    case ST_PROFILE_OPENGL_ES2:
 668       api = API_OPENGLES2;
 669       break;
 670    case ST_PROFILE_OPENGL_CORE:
 671       api = API_OPENGL_CORE;
 672       break;
 673    default:
 674       *error = ST_CONTEXT_ERROR_BAD_API;
 675       return NULL;
 676    }
 677
 678    if (attribs->flags & ST_CONTEXT_FLAG_ROBUST_ACCESS)
 679       ctx_flags |= PIPE_CONTEXT_ROBUST_BUFFER_ACCESS;
 680
 681    pipe = smapi->screen->context_create(smapi->screen, NULL, ctx_flags);
 682    if (!pipe) {
 683       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 684       return NULL;
 685    }
 686
 687    st_visual_to_context_mode(&attribs->visual, &mode);
 688    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 689    if (!st) {
 690       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 691       pipe->destroy(pipe);
 692       return NULL;
 693    }
 694
 695    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG) {
 696       if (!_mesa_set_debug_state_int(st->ctx, GL_DEBUG_OUTPUT, GL_TRUE)) {
 697          *error = ST_CONTEXT_ERROR_NO_MEMORY;
 698          return NULL;
 699       }
 700
 701       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 702    }
 703
 704    if (st->ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT) {
 705       st_update_debug_callback(st);
 706    }
 707
 708    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 709       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 710    if (attribs->flags & ST_CONTEXT_FLAG_ROBUST_ACCESS) {
 711       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
 712       st->ctx->Const.RobustAccess = GL_TRUE;
 713    }
 714    if (attribs->flags & ST_CONTEXT_FLAG_RESET_NOTIFICATION_ENABLED) {
 715       st->ctx->Const.ResetStrategy = GL_LOSE_CONTEXT_ON_RESET_ARB;
 716       st_install_device_reset_callback(st);
 717    }
 718
 719    /* need to perform version check */
 720    if (attribs->major > 1 || attribs->minor > 0) {
 721       /* Is the actual version less than the requested version?
 722        */
 723       if (st->ctx->Version < attribs->major * 10U + attribs->minor) {
 724          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 725          st_destroy_context(st);
 726          return NULL;
 727       }
 728    }
 729
 730    st->invalidate_on_gl_viewport =
 731       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 732
 733    st->iface.destroy = st_context_destroy;
 734    st->iface.flush = st_context_flush;
 735    st->iface.teximage = st_context_teximage;
 736    st->iface.copy = st_context_copy;
 737    st->iface.share = st_context_share;
 738    st->iface.start_thread = st_start_thread;
 739    st->iface.thread_finish = st_thread_finish;
 740    st->iface.st_context_private = (void *) smapi;
 741    st->iface.cso_context = st->cso_context;
 742    st->iface.pipe = st->pipe;
 743
 744    *error = ST_CONTEXT_SUCCESS;
 745    return &st->iface;
 746 }
 747
 748 static struct st_context_iface *
 749 st_api_get_current(struct st_api *stapi)
 750 {
 751    GET_CURRENT_CONTEXT(ctx);
 752    struct st_context *st = (ctx) ? ctx->st : NULL;
 753
 754    return (st) ? &st->iface : NULL;
 755 }
 756
 757 static struct st_framebuffer *
 758 st_framebuffer_reuse_or_create(struct st_context *st,
 759                                struct gl_framebuffer *fb,
 760                                struct st_framebuffer_iface *stfbi)
 761 {
 762    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 763
 764    /* dummy framebuffers cant be used as st_framebuffer */
 765    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 766        cur->iface == stfbi) {
 767       /* reuse the current stfb */
 768       st_framebuffer_reference(&stfb, cur);
 769    }
 770    else {
 771       /* create a new one */
 772       stfb = st_framebuffer_create(st, stfbi);
 773    }
 774
 775    return stfb;
 776 }
 777
 778 static boolean
 779 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 780                     struct st_framebuffer_iface *stdrawi,
 781                     struct st_framebuffer_iface *streadi)
 782 {
 783    struct st_context *st = (struct st_context *) stctxi;
 784    struct st_framebuffer *stdraw, *stread;
 785    boolean ret;
 786
 787    _glapi_check_multithread();
 788
 789    if (st) {
 790       /* reuse or create the draw fb */
 791       stdraw = st_framebuffer_reuse_or_create(st,
 792             st->ctx->WinSysDrawBuffer, stdrawi);
 793       if (streadi != stdrawi) {
 794          /* do the same for the read fb */
 795          stread = st_framebuffer_reuse_or_create(st,
 796                st->ctx->WinSysReadBuffer, streadi);
 797       }
 798       else {
 799          stread = NULL;
 800          /* reuse the draw fb for the read fb */
 801          if (stdraw)
 802             st_framebuffer_reference(&stread, stdraw);
 803       }
 804
 805       if (stdraw && stread) {
 806          st_framebuffer_validate(stdraw, st);
 807          if (stread != stdraw)
 808             st_framebuffer_validate(stread, st);
 809
 810          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 811
 812          st->draw_stamp = stdraw->stamp - 1;
 813          st->read_stamp = stread->stamp - 1;
 814          st_context_validate(st, stdraw, stread);
 815       }
 816       else {
 817          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 818          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 819       }
 820
 821       st_framebuffer_reference(&stdraw, NULL);
 822       st_framebuffer_reference(&stread, NULL);
 823    }
 824    else {
 825       ret = _mesa_make_current(NULL, NULL, NULL);
 826    }
 827
 828    return ret;
 829 }
 830
 831 static void
 832 st_api_destroy(struct st_api *stapi)
 833 {
 834 }
 835
 836 /**
 837  * Flush the front buffer if the current context renders to the front buffer.
 838  */
 839 void
 840 st_manager_flush_frontbuffer(struct st_context *st)
 841 {
 842    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 843    struct st_renderbuffer *strb = NULL;
 844
 845    if (stfb)
 846       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 847    if (!strb)
 848       return;
 849
 850    /* never a dummy fb */
 851    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 852 }
 853
 854 /**
 855  * Re-validate the framebuffers.
 856  */
 857 void
 858 st_manager_validate_framebuffers(struct st_context *st)
 859 {
 860    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 861    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 862
 863    if (stdraw)
 864       st_framebuffer_validate(stdraw, st);
 865    if (stread && stread != stdraw)
 866       st_framebuffer_validate(stread, st);
 867
 868    st_context_validate(st, stdraw, stread);
 869 }
 870
 871 /**
 872  * Add a color renderbuffer on demand.  The FBO must correspond to a window,
 873  * not a user-created FBO.
 874  */
 875 boolean
 876 st_manager_add_color_renderbuffer(struct st_context *st,
 877                                   struct gl_framebuffer *fb,
 878                                   gl_buffer_index idx)
 879 {
 880    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 881
 882    /* FBO */
 883    if (!stfb)
 884       return FALSE;
 885
 886    assert(_mesa_is_winsys_fbo(fb));
 887
 888    if (stfb->Base.Attachment[idx].Renderbuffer)
 889       return TRUE;
 890
 891    switch (idx) {
 892    case BUFFER_FRONT_LEFT:
 893    case BUFFER_BACK_LEFT:
 894    case BUFFER_FRONT_RIGHT:
 895    case BUFFER_BACK_RIGHT:
 896       break;
 897    default:
 898       return FALSE;
 899    }
 900
 901    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 902       return FALSE;
 903
 904    st_framebuffer_update_attachments(stfb);
 905
 906    /*
 907     * Force a call to the state tracker manager to validate the
 908     * new renderbuffer. It might be that there is a window system
 909     * renderbuffer available.
 910     */
 911    if (stfb->iface)
 912       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 913
 914    st_invalidate_buffers(st);
 915
 916    return TRUE;
 917 }
 918
 919 static unsigned
 920 get_version(struct pipe_screen *screen,
 921             struct st_config_options *options, gl_api api)
 922 {
 923    struct gl_constants consts = {0};
 924    struct gl_extensions extensions = {0};
 925    GLuint version;
 926
 927    if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 928       return version;
 929    }
 930
 931    _mesa_init_constants(&consts, api);
 932    _mesa_init_extensions(&extensions);
 933
 934    st_init_limits(screen, &consts, &extensions);
 935    st_init_extensions(screen, &consts, &extensions, options, GL_TRUE);
 936
 937    return _mesa_get_version(&extensions, &consts, api);
 938 }
 939
 940 static void
 941 st_api_query_versions(struct st_api *stapi, struct st_manager *sm,
 942                       struct st_config_options *options,
 943                       int *gl_core_version,
 944                       int *gl_compat_version,
 945                       int *gl_es1_version,
 946                       int *gl_es2_version)
 947 {
 948    *gl_core_version = get_version(sm->screen, options, API_OPENGL_CORE);
 949    *gl_compat_version = get_version(sm->screen, options, API_OPENGL_COMPAT);
 950    *gl_es1_version = get_version(sm->screen, options, API_OPENGLES);
 951    *gl_es2_version = get_version(sm->screen, options, API_OPENGLES2);
 952 }
 953
 954 static const struct st_api st_gl_api = {
 955    .name = "Mesa " PACKAGE_VERSION,
 956    .api = ST_API_OPENGL,
 957    .profile_mask = ST_PROFILE_DEFAULT_MASK |
 958                    ST_PROFILE_OPENGL_CORE_MASK |
 959                    ST_PROFILE_OPENGL_ES1_MASK |
 960                    ST_PROFILE_OPENGL_ES2_MASK |
 961                    0,
 962    .feature_mask = ST_API_FEATURE_MS_VISUALS_MASK,
 963    .destroy = st_api_destroy,
 964    .query_versions = st_api_query_versions,
 965    .create_context = st_api_create_context,
 966    .make_current = st_api_make_current,
 967    .get_current = st_api_get_current,
 968 };
 969
 970 struct st_api *
 971 st_gl_api_create(void)
 972 {
 973    return (struct st_api *) &st_gl_api;
 974 }