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/texobj.h"
  32 #include "main/teximage.h"
  33 #include "main/texstate.h"
  34 #include "main/errors.h"
  35 #include "main/framebuffer.h"
  36 #include "main/fbobject.h"
  37 #include "main/renderbuffer.h"
  38 #include "main/version.h"
  39 #include "st_texture.h"
  40
  41 #include "st_context.h"
  42 #include "st_extensions.h"
  43 #include "st_format.h"
  44 #include "st_cb_fbo.h"
  45 #include "st_cb_flush.h"
  46 #include "st_manager.h"
  47
  48 #include "state_tracker/st_gl_api.h"
  49
  50 #include "pipe/p_context.h"
  51 #include "pipe/p_screen.h"
  52 #include "util/u_format.h"
  53 #include "util/u_pointer.h"
  54 #include "util/u_inlines.h"
  55 #include "util/u_atomic.h"
  56 #include "util/u_surface.h"
  57
  58 /**
  59  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  60  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  61  * We'll only return non-null for window system framebuffers.
  62  * Note that this function may fail.
  63  */
  64 static INLINE struct st_framebuffer *
  65 st_ws_framebuffer(struct gl_framebuffer *fb)
  66 {
  67    /* FBO cannot be casted.  See st_new_framebuffer */
  68    if (fb && _mesa_is_winsys_fbo(fb))
  69       return (struct st_framebuffer *) fb;
  70    return NULL;
  71 }
  72
  73 /**
  74  * Map an attachment to a buffer index.
  75  */
  76 static INLINE gl_buffer_index
  77 attachment_to_buffer_index(enum st_attachment_type statt)
  78 {
  79    gl_buffer_index index;
  80
  81    switch (statt) {
  82    case ST_ATTACHMENT_FRONT_LEFT:
  83       index = BUFFER_FRONT_LEFT;
  84       break;
  85    case ST_ATTACHMENT_BACK_LEFT:
  86       index = BUFFER_BACK_LEFT;
  87       break;
  88    case ST_ATTACHMENT_FRONT_RIGHT:
  89       index = BUFFER_FRONT_RIGHT;
  90       break;
  91    case ST_ATTACHMENT_BACK_RIGHT:
  92       index = BUFFER_BACK_RIGHT;
  93       break;
  94    case ST_ATTACHMENT_DEPTH_STENCIL:
  95       index = BUFFER_DEPTH;
  96       break;
  97    case ST_ATTACHMENT_ACCUM:
  98       index = BUFFER_ACCUM;
  99       break;
 100    case ST_ATTACHMENT_SAMPLE:
 101    default:
 102       index = BUFFER_COUNT;
 103       break;
 104    }
 105
 106    return index;
 107 }
 108
 109 /**
 110  * Map a buffer index to an attachment.
 111  */
 112 static INLINE enum st_attachment_type
 113 buffer_index_to_attachment(gl_buffer_index index)
 114 {
 115    enum st_attachment_type statt;
 116
 117    switch (index) {
 118    case BUFFER_FRONT_LEFT:
 119       statt = ST_ATTACHMENT_FRONT_LEFT;
 120       break;
 121    case BUFFER_BACK_LEFT:
 122       statt = ST_ATTACHMENT_BACK_LEFT;
 123       break;
 124    case BUFFER_FRONT_RIGHT:
 125       statt = ST_ATTACHMENT_FRONT_RIGHT;
 126       break;
 127    case BUFFER_BACK_RIGHT:
 128       statt = ST_ATTACHMENT_BACK_RIGHT;
 129       break;
 130    case BUFFER_DEPTH:
 131       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 132       break;
 133    case BUFFER_ACCUM:
 134       statt = ST_ATTACHMENT_ACCUM;
 135       break;
 136    default:
 137       statt = ST_ATTACHMENT_INVALID;
 138       break;
 139    }
 140
 141    return statt;
 142 }
 143
 144 /**
 145  * Make sure a context picks up the latest cached state of the
 146  * drawables it binds to.
 147  */
 148 static void
 149 st_context_validate(struct st_context *st,
 150                     struct st_framebuffer *stdraw,
 151                     struct st_framebuffer *stread)
 152 {
 153     if (stdraw && stdraw->stamp != st->draw_stamp) {
 154        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 155        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 156                                 stdraw->Base.Width,
 157                                 stdraw->Base.Height);
 158        st->draw_stamp = stdraw->stamp;
 159     }
 160
 161     if (stread && stread->stamp != st->read_stamp) {
 162        if (stread != stdraw) {
 163           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 164           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 165                                    stread->Base.Width,
 166                                    stread->Base.Height);
 167        }
 168        st->read_stamp = stread->stamp;
 169     }
 170 }
 171
 172 /**
 173  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 174  * The context is only used for creating pipe surfaces and for calling
 175  * _mesa_resize_framebuffer().
 176  * (That should probably be rethought, since those surfaces become
 177  * drawable state, not context state, and can be freed by another pipe
 178  * context).
 179  */
 180 static void
 181 st_framebuffer_validate(struct st_framebuffer *stfb,
 182                         struct st_context *st)
 183 {
 184    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 185    uint width, height;
 186    unsigned i;
 187    boolean changed = FALSE;
 188    int32_t new_stamp;
 189
 190    /* Check for incomplete framebuffers (e.g. EGL_KHR_surfaceless_context) */
 191    if (!stfb->iface)
 192       return;
 193
 194    new_stamp = p_atomic_read(&stfb->iface->stamp);
 195    if (stfb->iface_stamp == new_stamp)
 196       return;
 197
 198    /* validate the fb */
 199    do {
 200       if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,
 201                                  stfb->num_statts, textures))
 202          return;
 203
 204       stfb->iface_stamp = new_stamp;
 205       new_stamp = p_atomic_read(&stfb->iface->stamp);
 206    } while(stfb->iface_stamp != new_stamp);
 207
 208    width = stfb->Base.Width;
 209    height = stfb->Base.Height;
 210
 211    for (i = 0; i < stfb->num_statts; i++) {
 212       struct st_renderbuffer *strb;
 213       struct pipe_surface *ps, surf_tmpl;
 214       gl_buffer_index idx;
 215
 216       if (!textures[i])
 217          continue;
 218
 219       idx = attachment_to_buffer_index(stfb->statts[i]);
 220       if (idx >= BUFFER_COUNT) {
 221          pipe_resource_reference(&textures[i], NULL);
 222          continue;
 223       }
 224
 225       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 226       assert(strb);
 227       if (strb->texture == textures[i]) {
 228          pipe_resource_reference(&textures[i], NULL);
 229          continue;
 230       }
 231
 232       u_surface_default_template(&surf_tmpl, textures[i]);
 233       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 234       if (ps) {
 235          pipe_surface_reference(&strb->surface, ps);
 236          pipe_resource_reference(&strb->texture, ps->texture);
 237          /* ownership transfered */
 238          pipe_surface_reference(&ps, NULL);
 239
 240          changed = TRUE;
 241
 242          strb->Base.Width = strb->surface->width;
 243          strb->Base.Height = strb->surface->height;
 244
 245          width = strb->Base.Width;
 246          height = strb->Base.Height;
 247       }
 248
 249       pipe_resource_reference(&textures[i], NULL);
 250    }
 251
 252    if (changed) {
 253       ++stfb->stamp;
 254       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 255    }
 256 }
 257
 258 /**
 259  * Update the attachments to validate by looping the existing renderbuffers.
 260  */
 261 static void
 262 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 263 {
 264    gl_buffer_index idx;
 265
 266    stfb->num_statts = 0;
 267    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 268       struct st_renderbuffer *strb;
 269       enum st_attachment_type statt;
 270
 271       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 272       if (!strb || strb->software)
 273          continue;
 274
 275       statt = buffer_index_to_attachment(idx);
 276       if (statt != ST_ATTACHMENT_INVALID &&
 277           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 278          stfb->statts[stfb->num_statts++] = statt;
 279    }
 280    stfb->stamp++;
 281 }
 282
 283 /**
 284  * Add a renderbuffer to the framebuffer.
 285  */
 286 static boolean
 287 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 288                                 gl_buffer_index idx)
 289 {
 290    struct gl_renderbuffer *rb;
 291    enum pipe_format format;
 292    boolean sw;
 293
 294    if (!stfb->iface)
 295       return FALSE;
 296
 297    /* do not distinguish depth/stencil buffers */
 298    if (idx == BUFFER_STENCIL)
 299       idx = BUFFER_DEPTH;
 300
 301    switch (idx) {
 302    case BUFFER_DEPTH:
 303       format = stfb->iface->visual->depth_stencil_format;
 304       sw = FALSE;
 305       break;
 306    case BUFFER_ACCUM:
 307       format = stfb->iface->visual->accum_format;
 308       sw = TRUE;
 309       break;
 310    default:
 311       format = stfb->iface->visual->color_format;
 312       if (stfb->Base.Visual.sRGBCapable)
 313          format = util_format_srgb(format);
 314       sw = FALSE;
 315       break;
 316    }
 317
 318    if (format == PIPE_FORMAT_NONE)
 319       return FALSE;
 320
 321    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 322    if (!rb)
 323       return FALSE;
 324
 325    if (idx != BUFFER_DEPTH) {
 326       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 327    }
 328    else {
 329       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 330          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 331       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 332          _mesa_add_renderbuffer(&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    }
 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_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    if (flags & ST_FLUSH_FRONT)
 504       st_manager_flush_frontbuffer(st);
 505 }
 506
 507 static boolean
 508 st_context_teximage(struct st_context_iface *stctxi,
 509                     enum st_texture_type tex_type,
 510                     int level, enum pipe_format pipe_format,
 511                     struct pipe_resource *tex, boolean mipmap)
 512 {
 513    struct st_context *st = (struct st_context *) stctxi;
 514    struct gl_context *ctx = st->ctx;
 515    struct gl_texture_object *texObj;
 516    struct gl_texture_image *texImage;
 517    struct st_texture_object *stObj;
 518    struct st_texture_image *stImage;
 519    GLenum internalFormat;
 520    GLuint width, height, depth;
 521    GLenum target;
 522
 523    switch (tex_type) {
 524    case ST_TEXTURE_1D:
 525       target = GL_TEXTURE_1D;
 526       break;
 527    case ST_TEXTURE_2D:
 528       target = GL_TEXTURE_2D;
 529       break;
 530    case ST_TEXTURE_3D:
 531       target = GL_TEXTURE_3D;
 532       break;
 533    case ST_TEXTURE_RECT:
 534       target = GL_TEXTURE_RECTANGLE_ARB;
 535       break;
 536    default:
 537       return FALSE;
 538    }
 539
 540    texObj = _mesa_get_current_tex_object(ctx, target);
 541
 542    _mesa_lock_texture(ctx, texObj);
 543
 544    stObj = st_texture_object(texObj);
 545    /* switch to surface based */
 546    if (!stObj->surface_based) {
 547       _mesa_clear_texture_object(ctx, texObj);
 548       stObj->surface_based = GL_TRUE;
 549    }
 550
 551    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 552    stImage = st_texture_image(texImage);
 553    if (tex) {
 554       mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
 555
 556       if (util_format_has_alpha(tex->format))
 557          internalFormat = GL_RGBA;
 558       else
 559          internalFormat = GL_RGB;
 560
 561       _mesa_init_teximage_fields(ctx, texImage,
 562                                  tex->width0, tex->height0, 1, 0,
 563                                  internalFormat, texFormat);
 564
 565       width = tex->width0;
 566       height = tex->height0;
 567       depth = tex->depth0;
 568
 569       /* grow the image size until we hit level = 0 */
 570       while (level > 0) {
 571          if (width != 1)
 572             width <<= 1;
 573          if (height != 1)
 574             height <<= 1;
 575          if (depth != 1)
 576             depth <<= 1;
 577          level--;
 578       }
 579    }
 580    else {
 581       _mesa_clear_texture_image(ctx, texImage);
 582       width = height = depth = 0;
 583    }
 584
 585    pipe_resource_reference(&stImage->pt, tex);
 586    stObj->width0 = width;
 587    stObj->height0 = height;
 588    stObj->depth0 = depth;
 589    stObj->surface_format = pipe_format;
 590
 591    _mesa_dirty_texobj(ctx, texObj);
 592    _mesa_unlock_texture(ctx, texObj);
 593
 594    return TRUE;
 595 }
 596
 597 static void
 598 st_context_copy(struct st_context_iface *stctxi,
 599                 struct st_context_iface *stsrci, unsigned mask)
 600 {
 601    struct st_context *st = (struct st_context *) stctxi;
 602    struct st_context *src = (struct st_context *) stsrci;
 603
 604    _mesa_copy_context(src->ctx, st->ctx, mask);
 605 }
 606
 607 static boolean
 608 st_context_share(struct st_context_iface *stctxi,
 609                  struct st_context_iface *stsrci)
 610 {
 611    struct st_context *st = (struct st_context *) stctxi;
 612    struct st_context *src = (struct st_context *) stsrci;
 613
 614    return _mesa_share_state(st->ctx, src->ctx);
 615 }
 616
 617 static void
 618 st_context_destroy(struct st_context_iface *stctxi)
 619 {
 620    struct st_context *st = (struct st_context *) stctxi;
 621    st_destroy_context(st);
 622 }
 623
 624 static struct st_context_iface *
 625 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 626                       const struct st_context_attribs *attribs,
 627                       enum st_context_error *error,
 628                       struct st_context_iface *shared_stctxi)
 629 {
 630    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 631    struct st_context *st;
 632    struct pipe_context *pipe;
 633    struct gl_config mode;
 634    gl_api api;
 635
 636    if (!(stapi->profile_mask & (1 << attribs->profile)))
 637       return NULL;
 638
 639    switch (attribs->profile) {
 640    case ST_PROFILE_DEFAULT:
 641       api = API_OPENGL_COMPAT;
 642       break;
 643    case ST_PROFILE_OPENGL_ES1:
 644       api = API_OPENGLES;
 645       break;
 646    case ST_PROFILE_OPENGL_ES2:
 647       api = API_OPENGLES2;
 648       break;
 649    case ST_PROFILE_OPENGL_CORE:
 650       api = API_OPENGL_CORE;
 651       break;
 652    default:
 653       *error = ST_CONTEXT_ERROR_BAD_API;
 654       return NULL;
 655       break;
 656    }
 657
 658    pipe = smapi->screen->context_create(smapi->screen, NULL);
 659    if (!pipe) {
 660       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 661       return NULL;
 662    }
 663
 664    st_visual_to_context_mode(&attribs->visual, &mode);
 665    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 666    if (!st) {
 667       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 668       pipe->destroy(pipe);
 669       return NULL;
 670    }
 671
 672    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG){
 673       if (!_mesa_set_debug_state_int(st->ctx, GL_DEBUG_OUTPUT, GL_TRUE)) {
 674          *error = ST_CONTEXT_ERROR_NO_MEMORY;
 675          return NULL;
 676       }
 677       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 678    }
 679
 680    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 681       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 682
 683    /* need to perform version check */
 684    if (attribs->major > 1 || attribs->minor > 0) {
 685       /* Is the actual version less than the requested version?
 686        */
 687       if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
 688          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 689          st_destroy_context(st);
 690          return NULL;
 691       }
 692    }
 693
 694    st->invalidate_on_gl_viewport =
 695       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 696
 697    st->iface.destroy = st_context_destroy;
 698    st->iface.flush = st_context_flush;
 699    st->iface.teximage = st_context_teximage;
 700    st->iface.copy = st_context_copy;
 701    st->iface.share = st_context_share;
 702    st->iface.st_context_private = (void *) smapi;
 703    st->iface.cso_context = st->cso_context;
 704    st->iface.pipe = st->pipe;
 705
 706    *error = ST_CONTEXT_SUCCESS;
 707    return &st->iface;
 708 }
 709
 710 static struct st_context_iface *
 711 st_api_get_current(struct st_api *stapi)
 712 {
 713    GET_CURRENT_CONTEXT(ctx);
 714    struct st_context *st = (ctx) ? ctx->st : NULL;
 715
 716    return (st) ? &st->iface : NULL;
 717 }
 718
 719 static struct st_framebuffer *
 720 st_framebuffer_reuse_or_create(struct st_context *st,
 721                                struct gl_framebuffer *fb,
 722                                struct st_framebuffer_iface *stfbi)
 723 {
 724    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 725
 726    /* dummy framebuffers cant be used as st_framebuffer */
 727    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 728        cur->iface == stfbi) {
 729       /* reuse the current stfb */
 730       st_framebuffer_reference(&stfb, cur);
 731    }
 732    else {
 733       /* create a new one */
 734       stfb = st_framebuffer_create(st, stfbi);
 735    }
 736
 737    return stfb;
 738 }
 739
 740 static boolean
 741 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 742                     struct st_framebuffer_iface *stdrawi,
 743                     struct st_framebuffer_iface *streadi)
 744 {
 745    struct st_context *st = (struct st_context *) stctxi;
 746    struct st_framebuffer *stdraw, *stread;
 747    boolean ret;
 748
 749    _glapi_check_multithread();
 750
 751    if (st) {
 752       /* reuse or create the draw fb */
 753       stdraw = st_framebuffer_reuse_or_create(st,
 754             st->ctx->WinSysDrawBuffer, stdrawi);
 755       if (streadi != stdrawi) {
 756          /* do the same for the read fb */
 757          stread = st_framebuffer_reuse_or_create(st,
 758                st->ctx->WinSysReadBuffer, streadi);
 759       }
 760       else {
 761          stread = NULL;
 762          /* reuse the draw fb for the read fb */
 763          if (stdraw)
 764             st_framebuffer_reference(&stread, stdraw);
 765       }
 766
 767       if (stdraw && stread) {
 768          st_framebuffer_validate(stdraw, st);
 769          if (stread != stdraw)
 770             st_framebuffer_validate(stread, st);
 771
 772          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 773
 774          st->draw_stamp = stdraw->stamp - 1;
 775          st->read_stamp = stread->stamp - 1;
 776          st_context_validate(st, stdraw, stread);
 777       }
 778       else {
 779          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 780          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 781       }
 782
 783       st_framebuffer_reference(&stdraw, NULL);
 784       st_framebuffer_reference(&stread, NULL);
 785    }
 786    else {
 787       ret = _mesa_make_current(NULL, NULL, NULL);
 788    }
 789
 790    return ret;
 791 }
 792
 793 static st_proc_t
 794 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 795 {
 796    return (st_proc_t) _glapi_get_proc_address(procname);
 797 }
 798
 799 static void
 800 st_api_destroy(struct st_api *stapi)
 801 {
 802 }
 803
 804 /**
 805  * Flush the front buffer if the current context renders to the front buffer.
 806  */
 807 void
 808 st_manager_flush_frontbuffer(struct st_context *st)
 809 {
 810    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 811    struct st_renderbuffer *strb = NULL;
 812
 813    if (stfb)
 814       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 815    if (!strb)
 816       return;
 817
 818    /* never a dummy fb */
 819    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 820    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 821 }
 822
 823 /**
 824  * Return the surface of an EGLImage.
 825  * FIXME: I think this should operate on resources, not surfaces
 826  */
 827 struct pipe_surface *
 828 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 829 {
 830    struct st_manager *smapi =
 831       (struct st_manager *) st->iface.st_context_private;
 832    struct st_egl_image stimg;
 833    struct pipe_surface *ps, surf_tmpl;
 834
 835    if (!smapi || !smapi->get_egl_image)
 836       return NULL;
 837
 838    memset(&stimg, 0, sizeof(stimg));
 839    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 840       return NULL;
 841
 842    u_surface_default_template(&surf_tmpl, stimg.texture);
 843    surf_tmpl.u.tex.level = stimg.level;
 844    surf_tmpl.u.tex.first_layer = stimg.layer;
 845    surf_tmpl.u.tex.last_layer = stimg.layer;
 846    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 847    pipe_resource_reference(&stimg.texture, NULL);
 848
 849    return ps;
 850 }
 851
 852 /**
 853  * Re-validate the framebuffers.
 854  */
 855 void
 856 st_manager_validate_framebuffers(struct st_context *st)
 857 {
 858    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 859    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 860
 861    if (stdraw)
 862       st_framebuffer_validate(stdraw, st);
 863    if (stread && stread != stdraw)
 864       st_framebuffer_validate(stread, st);
 865
 866    st_context_validate(st, stdraw, stread);
 867 }
 868
 869 /**
 870  * Add a color renderbuffer on demand.
 871  */
 872 boolean
 873 st_manager_add_color_renderbuffer(struct st_context *st,
 874                                   struct gl_framebuffer *fb,
 875                                   gl_buffer_index idx)
 876 {
 877    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 878
 879    /* FBO */
 880    if (!stfb)
 881       return FALSE;
 882
 883    if (stfb->Base.Attachment[idx].Renderbuffer)
 884       return TRUE;
 885
 886    switch (idx) {
 887    case BUFFER_FRONT_LEFT:
 888    case BUFFER_BACK_LEFT:
 889    case BUFFER_FRONT_RIGHT:
 890    case BUFFER_BACK_RIGHT:
 891       break;
 892    default:
 893       return FALSE;
 894       break;
 895    }
 896
 897    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 898       return FALSE;
 899
 900    st_framebuffer_update_attachments(stfb);
 901
 902    /*
 903     * Force a call to the state tracker manager to validate the
 904     * new renderbuffer. It might be that there is a window system
 905     * renderbuffer available.
 906     */
 907    if(stfb->iface)
 908       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 909
 910    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 911
 912    return TRUE;
 913 }
 914
 915 static unsigned get_version(struct pipe_screen *screen,
 916                             struct st_config_options *options, gl_api api)
 917 {
 918    struct gl_constants consts = {0};
 919    struct gl_extensions extensions = {0};
 920    GLuint version;
 921
 922    if ((api == API_OPENGL_COMPAT || api == API_OPENGL_CORE) &&
 923        _mesa_override_gl_version_contextless(&consts, &api, &version)) {
 924       return version;
 925    }
 926
 927    _mesa_init_constants(&consts, api);
 928    _mesa_init_extensions(&extensions);
 929
 930    st_init_limits(screen, &consts, &extensions);
 931    st_init_extensions(screen, &consts, &extensions, options, GL_TRUE);
 932
 933    return _mesa_get_version(&extensions, &consts, api);
 934 }
 935
 936 static void
 937 st_api_query_versions(struct st_api *stapi, struct st_manager *sm,
 938                       struct st_config_options *options,
 939                       int *gl_core_version,
 940                       int *gl_compat_version,
 941                       int *gl_es1_version,
 942                       int *gl_es2_version)
 943 {
 944    *gl_core_version = get_version(sm->screen, options, API_OPENGL_CORE);
 945    *gl_compat_version = get_version(sm->screen, options, API_OPENGL_COMPAT);
 946    *gl_es1_version = get_version(sm->screen, options, API_OPENGLES);
 947    *gl_es2_version = get_version(sm->screen, options, API_OPENGLES2);
 948 }
 949
 950 static const struct st_api st_gl_api = {
 951    "Mesa " PACKAGE_VERSION,
 952    ST_API_OPENGL,
 953    ST_PROFILE_DEFAULT_MASK |
 954    ST_PROFILE_OPENGL_CORE_MASK |
 955    ST_PROFILE_OPENGL_ES1_MASK |
 956    ST_PROFILE_OPENGL_ES2_MASK |
 957    0,
 958    ST_API_FEATURE_MS_VISUALS_MASK,
 959    st_api_destroy,
 960    st_api_query_versions,
 961    st_api_get_proc_address,
 962    st_api_create_context,
 963    st_api_make_current,
 964    st_api_get_current,
 965 };
 966
 967 struct st_api *
 968 st_gl_api_create(void)
 969 {
 970    return (struct st_api *) &st_gl_api;
 971 }