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