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 #include "util/list.h"
  61
  62
  63 /**
  64  * Map an attachment to a buffer index.
  65  */
  66 static inline gl_buffer_index
  67 attachment_to_buffer_index(enum st_attachment_type statt)
  68 {
  69    gl_buffer_index index;
  70
  71    switch (statt) {
  72    case ST_ATTACHMENT_FRONT_LEFT:
  73       index = BUFFER_FRONT_LEFT;
  74       break;
  75    case ST_ATTACHMENT_BACK_LEFT:
  76       index = BUFFER_BACK_LEFT;
  77       break;
  78    case ST_ATTACHMENT_FRONT_RIGHT:
  79       index = BUFFER_FRONT_RIGHT;
  80       break;
  81    case ST_ATTACHMENT_BACK_RIGHT:
  82       index = BUFFER_BACK_RIGHT;
  83       break;
  84    case ST_ATTACHMENT_DEPTH_STENCIL:
  85       index = BUFFER_DEPTH;
  86       break;
  87    case ST_ATTACHMENT_ACCUM:
  88       index = BUFFER_ACCUM;
  89       break;
  90    case ST_ATTACHMENT_SAMPLE:
  91    default:
  92       index = BUFFER_COUNT;
  93       break;
  94    }
  95
  96    return index;
  97 }
  98
  99 /**
 100  * Map a buffer index to an attachment.
 101  */
 102 static inline enum st_attachment_type
 103 buffer_index_to_attachment(gl_buffer_index index)
 104 {
 105    enum st_attachment_type statt;
 106
 107    switch (index) {
 108    case BUFFER_FRONT_LEFT:
 109       statt = ST_ATTACHMENT_FRONT_LEFT;
 110       break;
 111    case BUFFER_BACK_LEFT:
 112       statt = ST_ATTACHMENT_BACK_LEFT;
 113       break;
 114    case BUFFER_FRONT_RIGHT:
 115       statt = ST_ATTACHMENT_FRONT_RIGHT;
 116       break;
 117    case BUFFER_BACK_RIGHT:
 118       statt = ST_ATTACHMENT_BACK_RIGHT;
 119       break;
 120    case BUFFER_DEPTH:
 121       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 122       break;
 123    case BUFFER_ACCUM:
 124       statt = ST_ATTACHMENT_ACCUM;
 125       break;
 126    default:
 127       statt = ST_ATTACHMENT_INVALID;
 128       break;
 129    }
 130
 131    return statt;
 132 }
 133
 134 /**
 135  * Make sure a context picks up the latest cached state of the
 136  * drawables it binds to.
 137  */
 138 static void
 139 st_context_validate(struct st_context *st,
 140                     struct st_framebuffer *stdraw,
 141                     struct st_framebuffer *stread)
 142 {
 143     if (stdraw && stdraw->stamp != st->draw_stamp) {
 144        st->dirty |= ST_NEW_FRAMEBUFFER;
 145        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 146                                 stdraw->Base.Width,
 147                                 stdraw->Base.Height);
 148        st->draw_stamp = stdraw->stamp;
 149     }
 150
 151     if (stread && stread->stamp != st->read_stamp) {
 152        if (stread != stdraw) {
 153           st->dirty |= ST_NEW_FRAMEBUFFER;
 154           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 155                                    stread->Base.Width,
 156                                    stread->Base.Height);
 157        }
 158        st->read_stamp = stread->stamp;
 159     }
 160 }
 161
 162 /**
 163  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 164  * The context is only used for creating pipe surfaces and for calling
 165  * _mesa_resize_framebuffer().
 166  * (That should probably be rethought, since those surfaces become
 167  * drawable state, not context state, and can be freed by another pipe
 168  * context).
 169  */
 170 static void
 171 st_framebuffer_validate(struct st_framebuffer *stfb,
 172                         struct st_context *st)
 173 {
 174    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 175    uint width, height;
 176    unsigned i;
 177    boolean changed = FALSE;
 178    int32_t new_stamp;
 179
 180    new_stamp = p_atomic_read(&stfb->iface->stamp);
 181    if (stfb->iface_stamp == new_stamp)
 182       return;
 183
 184    /* validate the fb */
 185    do {
 186       if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,
 187                                  stfb->num_statts, textures))
 188          return;
 189
 190       stfb->iface_stamp = new_stamp;
 191       new_stamp = p_atomic_read(&stfb->iface->stamp);
 192    } while(stfb->iface_stamp != new_stamp);
 193
 194    width = stfb->Base.Width;
 195    height = stfb->Base.Height;
 196
 197    for (i = 0; i < stfb->num_statts; i++) {
 198       struct st_renderbuffer *strb;
 199       struct pipe_surface *ps, surf_tmpl;
 200       gl_buffer_index idx;
 201
 202       if (!textures[i])
 203          continue;
 204
 205       idx = attachment_to_buffer_index(stfb->statts[i]);
 206       if (idx >= BUFFER_COUNT) {
 207          pipe_resource_reference(&textures[i], NULL);
 208          continue;
 209       }
 210
 211       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 212       assert(strb);
 213       if (strb->texture == textures[i]) {
 214          pipe_resource_reference(&textures[i], NULL);
 215          continue;
 216       }
 217
 218       u_surface_default_template(&surf_tmpl, textures[i]);
 219       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 220       if (ps) {
 221          struct pipe_surface **psurf =
 222             util_format_is_srgb(ps->format) ? &strb->surface_srgb :
 223                                               &strb->surface_linear;
 224
 225          pipe_surface_reference(psurf, ps);
 226          strb->surface = *psurf;
 227          pipe_resource_reference(&strb->texture, ps->texture);
 228          /* ownership transfered */
 229          pipe_surface_reference(&ps, NULL);
 230
 231          changed = TRUE;
 232
 233          strb->Base.Width = strb->surface->width;
 234          strb->Base.Height = strb->surface->height;
 235
 236          width = strb->Base.Width;
 237          height = strb->Base.Height;
 238       }
 239
 240       pipe_resource_reference(&textures[i], NULL);
 241    }
 242
 243    if (changed) {
 244       ++stfb->stamp;
 245       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 246    }
 247 }
 248
 249 /**
 250  * Update the attachments to validate by looping the existing renderbuffers.
 251  */
 252 static void
 253 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 254 {
 255    gl_buffer_index idx;
 256
 257    stfb->num_statts = 0;
 258    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 259       struct st_renderbuffer *strb;
 260       enum st_attachment_type statt;
 261
 262       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 263       if (!strb || strb->software)
 264          continue;
 265
 266       statt = buffer_index_to_attachment(idx);
 267       if (statt != ST_ATTACHMENT_INVALID &&
 268           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 269          stfb->statts[stfb->num_statts++] = statt;
 270    }
 271    stfb->stamp++;
 272 }
 273
 274 /**
 275  * Add a renderbuffer to the framebuffer.  The framebuffer is one that
 276  * corresponds to a window and is not a user-created FBO.
 277  */
 278 static boolean
 279 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 280                                 gl_buffer_index idx)
 281 {
 282    struct gl_renderbuffer *rb;
 283    enum pipe_format format;
 284    boolean sw;
 285
 286    assert(_mesa_is_winsys_fbo(&stfb->Base));
 287
 288    /* do not distinguish depth/stencil buffers */
 289    if (idx == BUFFER_STENCIL)
 290       idx = BUFFER_DEPTH;
 291
 292    switch (idx) {
 293    case BUFFER_DEPTH:
 294       format = stfb->iface->visual->depth_stencil_format;
 295       sw = FALSE;
 296       break;
 297    case BUFFER_ACCUM:
 298       format = stfb->iface->visual->accum_format;
 299       sw = TRUE;
 300       break;
 301    default:
 302       format = stfb->iface->visual->color_format;
 303       if (stfb->Base.Visual.sRGBCapable)
 304          format = util_format_srgb(format);
 305       sw = FALSE;
 306       break;
 307    }
 308
 309    if (format == PIPE_FORMAT_NONE)
 310       return FALSE;
 311
 312    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 313    if (!rb)
 314       return FALSE;
 315
 316    if (idx != BUFFER_DEPTH) {
 317       _mesa_attach_and_own_rb(&stfb->Base, idx, rb);
 318       return TRUE;
 319    }
 320
 321    bool rb_ownership_taken = false;
 322    if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0)) {
 323       _mesa_attach_and_own_rb(&stfb->Base, BUFFER_DEPTH, rb);
 324       rb_ownership_taken = true;
 325    }
 326
 327    if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1)) {
 328       if (rb_ownership_taken)
 329          _mesa_attach_and_reference_rb(&stfb->Base, BUFFER_STENCIL, rb);
 330       else
 331          _mesa_attach_and_own_rb(&stfb->Base, BUFFER_STENCIL, rb);
 332    }
 333
 334    return TRUE;
 335 }
 336
 337 /**
 338  * Intialize a struct gl_config from a visual.
 339  */
 340 static void
 341 st_visual_to_context_mode(const struct st_visual *visual,
 342                           struct gl_config *mode)
 343 {
 344    memset(mode, 0, sizeof(*mode));
 345
 346    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 347       mode->doubleBufferMode = GL_TRUE;
 348    if (st_visual_have_buffers(visual,
 349             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 350       mode->stereoMode = GL_TRUE;
 351
 352    if (visual->color_format != PIPE_FORMAT_NONE) {
 353       mode->rgbMode = GL_TRUE;
 354
 355       mode->redBits =
 356          util_format_get_component_bits(visual->color_format,
 357                UTIL_FORMAT_COLORSPACE_RGB, 0);
 358       mode->greenBits =
 359          util_format_get_component_bits(visual->color_format,
 360                UTIL_FORMAT_COLORSPACE_RGB, 1);
 361       mode->blueBits =
 362          util_format_get_component_bits(visual->color_format,
 363                UTIL_FORMAT_COLORSPACE_RGB, 2);
 364       mode->alphaBits =
 365          util_format_get_component_bits(visual->color_format,
 366                UTIL_FORMAT_COLORSPACE_RGB, 3);
 367
 368       mode->rgbBits = mode->redBits +
 369          mode->greenBits + mode->blueBits + mode->alphaBits;
 370       mode->sRGBCapable = util_format_is_srgb(visual->color_format);
 371    }
 372
 373    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 374       mode->depthBits =
 375          util_format_get_component_bits(visual->depth_stencil_format,
 376                UTIL_FORMAT_COLORSPACE_ZS, 0);
 377       mode->stencilBits =
 378          util_format_get_component_bits(visual->depth_stencil_format,
 379                UTIL_FORMAT_COLORSPACE_ZS, 1);
 380
 381       mode->haveDepthBuffer = mode->depthBits > 0;
 382       mode->haveStencilBuffer = mode->stencilBits > 0;
 383    }
 384
 385    if (visual->accum_format != PIPE_FORMAT_NONE) {
 386       mode->haveAccumBuffer = GL_TRUE;
 387
 388       mode->accumRedBits =
 389          util_format_get_component_bits(visual->accum_format,
 390                UTIL_FORMAT_COLORSPACE_RGB, 0);
 391       mode->accumGreenBits =
 392          util_format_get_component_bits(visual->accum_format,
 393                UTIL_FORMAT_COLORSPACE_RGB, 1);
 394       mode->accumBlueBits =
 395          util_format_get_component_bits(visual->accum_format,
 396                UTIL_FORMAT_COLORSPACE_RGB, 2);
 397       mode->accumAlphaBits =
 398          util_format_get_component_bits(visual->accum_format,
 399                UTIL_FORMAT_COLORSPACE_RGB, 3);
 400    }
 401
 402    if (visual->samples > 1) {
 403       mode->sampleBuffers = 1;
 404       mode->samples = visual->samples;
 405    }
 406 }
 407
 408 /**
 409  * Create a framebuffer from a manager interface.
 410  */
 411 static struct st_framebuffer *
 412 st_framebuffer_create(struct st_context *st,
 413                       struct st_framebuffer_iface *stfbi)
 414 {
 415    struct st_framebuffer *stfb;
 416    struct gl_config mode;
 417    gl_buffer_index idx;
 418
 419    if (!stfbi)
 420       return NULL;
 421
 422    stfb = CALLOC_STRUCT(st_framebuffer);
 423    if (!stfb)
 424       return NULL;
 425
 426    st_visual_to_context_mode(stfbi->visual, &mode);
 427
 428    /*
 429     * For desktop GL, sRGB framebuffer write is controlled by both the
 430     * capability of the framebuffer and GL_FRAMEBUFFER_SRGB.  We should
 431     * advertise the capability when the pipe driver (and core Mesa) supports
 432     * it so that applications can enable sRGB write when they want to.
 433     *
 434     * This is not to be confused with GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB.  When
 435     * the attribute is GLX_TRUE, it tells the st manager to pick a color
 436     * format such that util_format_srgb(visual->color_format) can be supported
 437     * by the pipe driver.  We still need to advertise the capability here.
 438     *
 439     * For GLES, however, sRGB framebuffer write is controlled only by the
 440     * capability of the framebuffer.  There is GL_EXT_sRGB_write_control to
 441     * give applications the control back, but sRGB write is still enabled by
 442     * default.  To avoid unexpected results, we should not advertise the
 443     * capability.  This could change when we add support for
 444     * EGL_KHR_gl_colorspace.
 445     */
 446    if (_mesa_is_desktop_gl(st->ctx)) {
 447       struct pipe_screen *screen = st->pipe->screen;
 448       const enum pipe_format srgb_format =
 449          util_format_srgb(stfbi->visual->color_format);
 450
 451       if (srgb_format != PIPE_FORMAT_NONE &&
 452           st_pipe_format_to_mesa_format(srgb_format) != MESA_FORMAT_NONE &&
 453           screen->is_format_supported(screen, srgb_format,
 454                                       PIPE_TEXTURE_2D, stfbi->visual->samples,
 455                                       (PIPE_BIND_DISPLAY_TARGET |
 456                                        PIPE_BIND_RENDER_TARGET)))
 457          mode.sRGBCapable = GL_TRUE;
 458    }
 459
 460    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 461
 462    stfb->iface = stfbi;
 463    stfb->iface_ID = stfbi->ID;
 464    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 465
 466    /* add the color buffer */
 467    idx = stfb->Base._ColorDrawBufferIndexes[0];
 468    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 469       free(stfb);
 470       return NULL;
 471    }
 472
 473    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 474    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 475
 476    stfb->stamp = 0;
 477    st_framebuffer_update_attachments(stfb);
 478
 479    return stfb;
 480 }
 481
 482 /**
 483  * Reference a framebuffer.
 484  */
 485 void
 486 st_framebuffer_reference(struct st_framebuffer **ptr,
 487                          struct st_framebuffer *stfb)
 488 {
 489    struct gl_framebuffer *fb = &stfb->Base;
 490    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 491 }
 492
 493 /**
 494  * Purge the winsys buffers list to remove any references to
 495  * non-existing framebuffer interface objects.
 496  */
 497 static void
 498 st_framebuffers_purge(struct st_context *st)
 499 {
 500    struct st_framebuffer *stfb, *next;
 501
 502    LIST_FOR_EACH_ENTRY_SAFE_REV(stfb, next, &st->winsys_buffers, head) {
 503       /**
 504        * If the corresponding framebuffer interface object no longer exists,
 505        * remove the framebuffer object from the context's winsys buffers list,
 506        * and unreference the framebuffer object, so its resources can be
 507        * deleted.
 508        */
 509       if (stfb->iface->ID != stfb->iface_ID) {
 510          LIST_DEL(&stfb->head);
 511          st_framebuffer_reference(&stfb, NULL);
 512       }
 513    }
 514 }
 515
 516 static void
 517 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 518                  struct pipe_fence_handle **fence)
 519 {
 520    struct st_context *st = (struct st_context *) stctxi;
 521    unsigned pipe_flags = 0;
 522
 523    if (flags & ST_FLUSH_END_OF_FRAME) {
 524       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 525    }
 526
 527    st_flush(st, fence, pipe_flags);
 528
 529    if ((flags & ST_FLUSH_WAIT) && fence) {
 530       st->pipe->screen->fence_finish(st->pipe->screen, NULL, *fence,
 531                                      PIPE_TIMEOUT_INFINITE);
 532       st->pipe->screen->fence_reference(st->pipe->screen, fence, NULL);
 533    }
 534
 535    if (flags & ST_FLUSH_FRONT)
 536       st_manager_flush_frontbuffer(st);
 537 }
 538
 539 static boolean
 540 st_context_teximage(struct st_context_iface *stctxi,
 541                     enum st_texture_type tex_type,
 542                     int level, enum pipe_format pipe_format,
 543                     struct pipe_resource *tex, boolean mipmap)
 544 {
 545    struct st_context *st = (struct st_context *) stctxi;
 546    struct gl_context *ctx = st->ctx;
 547    struct gl_texture_object *texObj;
 548    struct gl_texture_image *texImage;
 549    struct st_texture_object *stObj;
 550    struct st_texture_image *stImage;
 551    GLenum internalFormat;
 552    GLuint width, height, depth;
 553    GLenum target;
 554
 555    switch (tex_type) {
 556    case ST_TEXTURE_1D:
 557       target = GL_TEXTURE_1D;
 558       break;
 559    case ST_TEXTURE_2D:
 560       target = GL_TEXTURE_2D;
 561       break;
 562    case ST_TEXTURE_3D:
 563       target = GL_TEXTURE_3D;
 564       break;
 565    case ST_TEXTURE_RECT:
 566       target = GL_TEXTURE_RECTANGLE_ARB;
 567       break;
 568    default:
 569       return FALSE;
 570    }
 571
 572    texObj = _mesa_get_current_tex_object(ctx, target);
 573
 574    _mesa_lock_texture(ctx, texObj);
 575
 576    stObj = st_texture_object(texObj);
 577    /* switch to surface based */
 578    if (!stObj->surface_based) {
 579       _mesa_clear_texture_object(ctx, texObj);
 580       stObj->surface_based = GL_TRUE;
 581    }
 582
 583    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 584    stImage = st_texture_image(texImage);
 585    if (tex) {
 586       mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
 587
 588       if (util_format_has_alpha(tex->format))
 589          internalFormat = GL_RGBA;
 590       else
 591          internalFormat = GL_RGB;
 592
 593       _mesa_init_teximage_fields(ctx, texImage,
 594                                  tex->width0, tex->height0, 1, 0,
 595                                  internalFormat, texFormat);
 596
 597       width = tex->width0;
 598       height = tex->height0;
 599       depth = tex->depth0;
 600
 601       /* grow the image size until we hit level = 0 */
 602       while (level > 0) {
 603          if (width != 1)
 604             width <<= 1;
 605          if (height != 1)
 606             height <<= 1;
 607          if (depth != 1)
 608             depth <<= 1;
 609          level--;
 610       }
 611    }
 612    else {
 613       _mesa_clear_texture_image(ctx, texImage);
 614       width = height = depth = 0;
 615    }
 616
 617    pipe_resource_reference(&stImage->pt, tex);
 618    stObj->surface_format = pipe_format;
 619
 620    stObj->needs_validation = true;
 621
 622    _mesa_dirty_texobj(ctx, texObj);
 623    _mesa_unlock_texture(ctx, texObj);
 624
 625    return TRUE;
 626 }
 627
 628 static void
 629 st_context_copy(struct st_context_iface *stctxi,
 630                 struct st_context_iface *stsrci, unsigned mask)
 631 {
 632    struct st_context *st = (struct st_context *) stctxi;
 633    struct st_context *src = (struct st_context *) stsrci;
 634
 635    _mesa_copy_context(src->ctx, st->ctx, mask);
 636 }
 637
 638 static boolean
 639 st_context_share(struct st_context_iface *stctxi,
 640                  struct st_context_iface *stsrci)
 641 {
 642    struct st_context *st = (struct st_context *) stctxi;
 643    struct st_context *src = (struct st_context *) stsrci;
 644
 645    return _mesa_share_state(st->ctx, src->ctx);
 646 }
 647
 648 static void
 649 st_context_destroy(struct st_context_iface *stctxi)
 650 {
 651    struct st_context *st = (struct st_context *) stctxi;
 652    st_destroy_context(st);
 653 }
 654
 655 static void
 656 st_start_thread(struct st_context_iface *stctxi)
 657 {
 658    struct st_context *st = (struct st_context *) stctxi;
 659
 660    _mesa_glthread_init(st->ctx);
 661 }
 662
 663 static void
 664 st_thread_finish(struct st_context_iface *stctxi)
 665 {
 666    struct st_context *st = (struct st_context *) stctxi;
 667
 668    _mesa_glthread_finish(st->ctx);
 669 }
 670
 671 static struct st_context_iface *
 672 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 673                       const struct st_context_attribs *attribs,
 674                       enum st_context_error *error,
 675                       struct st_context_iface *shared_stctxi)
 676 {
 677    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 678    struct st_context *st;
 679    struct pipe_context *pipe;
 680    struct gl_config mode;
 681    gl_api api;
 682    unsigned ctx_flags = PIPE_CONTEXT_PREFER_THREADED;
 683
 684    if (!(stapi->profile_mask & (1 << attribs->profile)))
 685       return NULL;
 686
 687    switch (attribs->profile) {
 688    case ST_PROFILE_DEFAULT:
 689       api = API_OPENGL_COMPAT;
 690       break;
 691    case ST_PROFILE_OPENGL_ES1:
 692       api = API_OPENGLES;
 693       break;
 694    case ST_PROFILE_OPENGL_ES2:
 695       api = API_OPENGLES2;
 696       break;
 697    case ST_PROFILE_OPENGL_CORE:
 698       api = API_OPENGL_CORE;
 699       break;
 700    default:
 701       *error = ST_CONTEXT_ERROR_BAD_API;
 702       return NULL;
 703    }
 704
 705    if (attribs->flags & ST_CONTEXT_FLAG_ROBUST_ACCESS)
 706       ctx_flags |= PIPE_CONTEXT_ROBUST_BUFFER_ACCESS;
 707
 708    pipe = smapi->screen->context_create(smapi->screen, NULL, ctx_flags);
 709    if (!pipe) {
 710       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 711       return NULL;
 712    }
 713
 714    st_visual_to_context_mode(&attribs->visual, &mode);
 715    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 716    if (!st) {
 717       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 718       pipe->destroy(pipe);
 719       return NULL;
 720    }
 721
 722    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG) {
 723       if (!_mesa_set_debug_state_int(st->ctx, GL_DEBUG_OUTPUT, GL_TRUE)) {
 724          *error = ST_CONTEXT_ERROR_NO_MEMORY;
 725          return NULL;
 726       }
 727
 728       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 729    }
 730
 731    if (st->ctx->Const.ContextFlags & GL_CONTEXT_FLAG_DEBUG_BIT) {
 732       st_update_debug_callback(st);
 733    }
 734
 735    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 736       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 737    if (attribs->flags & ST_CONTEXT_FLAG_ROBUST_ACCESS) {
 738       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
 739       st->ctx->Const.RobustAccess = GL_TRUE;
 740    }
 741    if (attribs->flags & ST_CONTEXT_FLAG_RESET_NOTIFICATION_ENABLED) {
 742       st->ctx->Const.ResetStrategy = GL_LOSE_CONTEXT_ON_RESET_ARB;
 743       st_install_device_reset_callback(st);
 744    }
 745
 746    /* need to perform version check */
 747    if (attribs->major > 1 || attribs->minor > 0) {
 748       /* Is the actual version less than the requested version?
 749        */
 750       if (st->ctx->Version < attribs->major * 10U + attribs->minor) {
 751          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 752          st_destroy_context(st);
 753          return NULL;
 754       }
 755    }
 756
 757    st->invalidate_on_gl_viewport =
 758       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 759
 760    st->iface.destroy = st_context_destroy;
 761    st->iface.flush = st_context_flush;
 762    st->iface.teximage = st_context_teximage;
 763    st->iface.copy = st_context_copy;
 764    st->iface.share = st_context_share;
 765    st->iface.start_thread = st_start_thread;
 766    st->iface.thread_finish = st_thread_finish;
 767    st->iface.st_context_private = (void *) smapi;
 768    st->iface.cso_context = st->cso_context;
 769    st->iface.pipe = st->pipe;
 770
 771    *error = ST_CONTEXT_SUCCESS;
 772    return &st->iface;
 773 }
 774
 775 static struct st_context_iface *
 776 st_api_get_current(struct st_api *stapi)
 777 {
 778    GET_CURRENT_CONTEXT(ctx);
 779    struct st_context *st = (ctx) ? ctx->st : NULL;
 780
 781    return (st) ? &st->iface : NULL;
 782 }
 783
 784 static struct st_framebuffer *
 785 st_framebuffer_reuse_or_create(struct st_context *st,
 786                                struct gl_framebuffer *fb,
 787                                struct st_framebuffer_iface *stfbi)
 788 {
 789    struct st_framebuffer *cur = NULL, *stfb = NULL;
 790
 791    if (!stfbi)
 792         return NULL;
 793
 794    /* Check if there is already a framebuffer object for the specified
 795     * framebuffer interface in this context. If there is one, use it.
 796     */
 797    LIST_FOR_EACH_ENTRY(cur, &st->winsys_buffers, head) {
 798       if (cur->iface_ID == stfbi->ID) {
 799          st_framebuffer_reference(&stfb, cur);
 800          break;
 801       }
 802    }
 803
 804    /* If there is not already a framebuffer object, create one */
 805    if (stfb == NULL) {
 806       cur = st_framebuffer_create(st, stfbi);
 807
 808       if (cur) {
 809          /* add to the context's winsys buffers list */
 810          LIST_ADD(&cur->head, &st->winsys_buffers);
 811
 812          st_framebuffer_reference(&stfb, cur);
 813       }
 814    }
 815
 816    return stfb;
 817 }
 818
 819 static boolean
 820 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 821                     struct st_framebuffer_iface *stdrawi,
 822                     struct st_framebuffer_iface *streadi)
 823 {
 824    struct st_context *st = (struct st_context *) stctxi;
 825    struct st_framebuffer *stdraw, *stread;
 826    boolean ret;
 827
 828    _glapi_check_multithread();
 829
 830    if (st) {
 831       /* reuse or create the draw fb */
 832       stdraw = st_framebuffer_reuse_or_create(st,
 833             st->ctx->WinSysDrawBuffer, stdrawi);
 834       if (streadi != stdrawi) {
 835          /* do the same for the read fb */
 836          stread = st_framebuffer_reuse_or_create(st,
 837                st->ctx->WinSysReadBuffer, streadi);
 838       }
 839       else {
 840          stread = NULL;
 841          /* reuse the draw fb for the read fb */
 842          if (stdraw)
 843             st_framebuffer_reference(&stread, stdraw);
 844       }
 845
 846       if (stdraw && stread) {
 847          st_framebuffer_validate(stdraw, st);
 848          if (stread != stdraw)
 849             st_framebuffer_validate(stread, st);
 850
 851          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 852
 853          st->draw_stamp = stdraw->stamp - 1;
 854          st->read_stamp = stread->stamp - 1;
 855          st_context_validate(st, stdraw, stread);
 856       }
 857       else {
 858          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 859          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 860       }
 861
 862       st_framebuffer_reference(&stdraw, NULL);
 863       st_framebuffer_reference(&stread, NULL);
 864
 865       /* Purge the context's winsys_buffers list in case any
 866        * of the referenced drawables no longer exist.
 867        */
 868       st_framebuffers_purge(st);
 869    }
 870    else {
 871       ret = _mesa_make_current(NULL, NULL, NULL);
 872    }
 873
 874    return ret;
 875 }
 876
 877 static void
 878 st_api_destroy(struct st_api *stapi)
 879 {
 880 }
 881
 882 /**
 883  * Flush the front buffer if the current context renders to the front buffer.
 884  */
 885 void
 886 st_manager_flush_frontbuffer(struct st_context *st)
 887 {
 888    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 889    struct st_renderbuffer *strb = NULL;
 890
 891    if (stfb)
 892       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 893    if (!strb)
 894       return;
 895
 896    /* never a dummy fb */
 897    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 898 }
 899
 900 /**
 901  * Re-validate the framebuffers.
 902  */
 903 void
 904 st_manager_validate_framebuffers(struct st_context *st)
 905 {
 906    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 907    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 908
 909    if (stdraw)
 910       st_framebuffer_validate(stdraw, st);
 911    if (stread && stread != stdraw)
 912       st_framebuffer_validate(stread, st);
 913
 914    st_context_validate(st, stdraw, stread);
 915 }
 916
 917 /**
 918  * Add a color renderbuffer on demand.  The FBO must correspond to a window,
 919  * not a user-created FBO.
 920  */
 921 boolean
 922 st_manager_add_color_renderbuffer(struct st_context *st,
 923                                   struct gl_framebuffer *fb,
 924                                   gl_buffer_index idx)
 925 {
 926    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 927
 928    /* FBO */
 929    if (!stfb)
 930       return FALSE;
 931
 932    assert(_mesa_is_winsys_fbo(fb));
 933
 934    if (stfb->Base.Attachment[idx].Renderbuffer)
 935       return TRUE;
 936
 937    switch (idx) {
 938    case BUFFER_FRONT_LEFT:
 939    case BUFFER_BACK_LEFT:
 940    case BUFFER_FRONT_RIGHT:
 941    case BUFFER_BACK_RIGHT:
 942       break;
 943    default:
 944       return FALSE;
 945    }
 946
 947    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 948       return FALSE;
 949
 950    st_framebuffer_update_attachments(stfb);
 951
 952    /*
 953     * Force a call to the state tracker manager to validate the
 954     * new renderbuffer. It might be that there is a window system
 955     * renderbuffer available.
 956     */
 957    if (stfb->iface)
 958       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 959
 960    st_invalidate_buffers(st);
 961
 962    return TRUE;
 963 }
 964
 965 static unsigned
 966 get_version(struct pipe_screen *screen,
 967             struct st_config_options *options, gl_api api)
 968 {
 969    struct gl_constants consts = {0};
 970    struct gl_extensions extensions = {0};
 971    GLuint version;
 972
 973    if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 974       return version;
 975    }
 976
 977    _mesa_init_constants(&consts, api);
 978    _mesa_init_extensions(&extensions);
 979
 980    st_init_limits(screen, &consts, &extensions);
 981    st_init_extensions(screen, &consts, &extensions, options, GL_TRUE);
 982
 983    return _mesa_get_version(&extensions, &consts, api);
 984 }
 985
 986 static void
 987 st_api_query_versions(struct st_api *stapi, struct st_manager *sm,
 988                       struct st_config_options *options,
 989                       int *gl_core_version,
 990                       int *gl_compat_version,
 991                       int *gl_es1_version,
 992                       int *gl_es2_version)
 993 {
 994    *gl_core_version = get_version(sm->screen, options, API_OPENGL_CORE);
 995    *gl_compat_version = get_version(sm->screen, options, API_OPENGL_COMPAT);
 996    *gl_es1_version = get_version(sm->screen, options, API_OPENGLES);
 997    *gl_es2_version = get_version(sm->screen, options, API_OPENGLES2);
 998 }
 999
1000 static const struct st_api st_gl_api = {
1001    .name = "Mesa " PACKAGE_VERSION,
1002    .api = ST_API_OPENGL,
1003    .profile_mask = ST_PROFILE_DEFAULT_MASK |
1004                    ST_PROFILE_OPENGL_CORE_MASK |
1005                    ST_PROFILE_OPENGL_ES1_MASK |
1006                    ST_PROFILE_OPENGL_ES2_MASK |
1007                    0,
1008    .feature_mask = ST_API_FEATURE_MS_VISUALS_MASK,
1009    .destroy = st_api_destroy,
1010    .query_versions = st_api_query_versions,
1011    .create_context = st_api_create_context,
1012    .make_current = st_api_make_current,
1013    .get_current = st_api_get_current,
1014 };
1015
1016 struct st_api *
1017 st_gl_api_create(void)
1018 {
1019    return (struct st_api *) &st_gl_api;
1020 }