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       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    if (flags & ST_FLUSH_FRONT)
 506       st_manager_flush_frontbuffer(st);
 507 }
 508
 509 static boolean
 510 st_context_teximage(struct st_context_iface *stctxi,
 511                     enum st_texture_type tex_type,
 512                     int level, enum pipe_format pipe_format,
 513                     struct pipe_resource *tex, boolean mipmap)
 514 {
 515    struct st_context *st = (struct st_context *) stctxi;
 516    struct gl_context *ctx = st->ctx;
 517    struct gl_texture_object *texObj;
 518    struct gl_texture_image *texImage;
 519    struct st_texture_object *stObj;
 520    struct st_texture_image *stImage;
 521    GLenum internalFormat;
 522    GLuint width, height, depth;
 523    GLenum target;
 524
 525    switch (tex_type) {
 526    case ST_TEXTURE_1D:
 527       target = GL_TEXTURE_1D;
 528       break;
 529    case ST_TEXTURE_2D:
 530       target = GL_TEXTURE_2D;
 531       break;
 532    case ST_TEXTURE_3D:
 533       target = GL_TEXTURE_3D;
 534       break;
 535    case ST_TEXTURE_RECT:
 536       target = GL_TEXTURE_RECTANGLE_ARB;
 537       break;
 538    default:
 539       return FALSE;
 540    }
 541
 542    texObj = _mesa_get_current_tex_object(ctx, target);
 543
 544    _mesa_lock_texture(ctx, texObj);
 545
 546    stObj = st_texture_object(texObj);
 547    /* switch to surface based */
 548    if (!stObj->surface_based) {
 549       _mesa_clear_texture_object(ctx, texObj);
 550       stObj->surface_based = GL_TRUE;
 551    }
 552
 553    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 554    stImage = st_texture_image(texImage);
 555    if (tex) {
 556       mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
 557
 558       if (util_format_has_alpha(tex->format))
 559          internalFormat = GL_RGBA;
 560       else
 561          internalFormat = GL_RGB;
 562
 563       _mesa_init_teximage_fields(ctx, texImage,
 564                                  tex->width0, tex->height0, 1, 0,
 565                                  internalFormat, texFormat);
 566
 567       width = tex->width0;
 568       height = tex->height0;
 569       depth = tex->depth0;
 570
 571       /* grow the image size until we hit level = 0 */
 572       while (level > 0) {
 573          if (width != 1)
 574             width <<= 1;
 575          if (height != 1)
 576             height <<= 1;
 577          if (depth != 1)
 578             depth <<= 1;
 579          level--;
 580       }
 581    }
 582    else {
 583       _mesa_clear_texture_image(ctx, texImage);
 584       width = height = depth = 0;
 585    }
 586
 587    pipe_resource_reference(&stImage->pt, tex);
 588    stObj->width0 = width;
 589    stObj->height0 = height;
 590    stObj->depth0 = depth;
 591    stObj->surface_format = pipe_format;
 592
 593    _mesa_dirty_texobj(ctx, texObj);
 594    _mesa_unlock_texture(ctx, texObj);
 595
 596    return TRUE;
 597 }
 598
 599 static void
 600 st_context_copy(struct st_context_iface *stctxi,
 601                 struct st_context_iface *stsrci, unsigned mask)
 602 {
 603    struct st_context *st = (struct st_context *) stctxi;
 604    struct st_context *src = (struct st_context *) stsrci;
 605
 606    _mesa_copy_context(src->ctx, st->ctx, mask);
 607 }
 608
 609 static boolean
 610 st_context_share(struct st_context_iface *stctxi,
 611                  struct st_context_iface *stsrci)
 612 {
 613    struct st_context *st = (struct st_context *) stctxi;
 614    struct st_context *src = (struct st_context *) stsrci;
 615
 616    return _mesa_share_state(st->ctx, src->ctx);
 617 }
 618
 619 static void
 620 st_context_destroy(struct st_context_iface *stctxi)
 621 {
 622    struct st_context *st = (struct st_context *) stctxi;
 623    st_destroy_context(st);
 624 }
 625
 626 static struct st_context_iface *
 627 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 628                       const struct st_context_attribs *attribs,
 629                       enum st_context_error *error,
 630                       struct st_context_iface *shared_stctxi)
 631 {
 632    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 633    struct st_context *st;
 634    struct pipe_context *pipe;
 635    struct gl_config mode;
 636    gl_api api;
 637
 638    if (!(stapi->profile_mask & (1 << attribs->profile)))
 639       return NULL;
 640
 641    switch (attribs->profile) {
 642    case ST_PROFILE_DEFAULT:
 643       api = API_OPENGL_COMPAT;
 644       break;
 645    case ST_PROFILE_OPENGL_ES1:
 646       api = API_OPENGLES;
 647       break;
 648    case ST_PROFILE_OPENGL_ES2:
 649       api = API_OPENGLES2;
 650       break;
 651    case ST_PROFILE_OPENGL_CORE:
 652       api = API_OPENGL_CORE;
 653       break;
 654    default:
 655       *error = ST_CONTEXT_ERROR_BAD_API;
 656       return NULL;
 657       break;
 658    }
 659
 660    pipe = smapi->screen->context_create(smapi->screen, NULL);
 661    if (!pipe) {
 662       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 663       return NULL;
 664    }
 665
 666    st_visual_to_context_mode(&attribs->visual, &mode);
 667    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 668    if (!st) {
 669       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 670       pipe->destroy(pipe);
 671       return NULL;
 672    }
 673
 674    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG){
 675       if (!_mesa_set_debug_state_int(st->ctx, GL_DEBUG_OUTPUT, GL_TRUE)) {
 676          *error = ST_CONTEXT_ERROR_NO_MEMORY;
 677          return NULL;
 678       }
 679       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 680    }
 681
 682    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 683       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 684    if (attribs->flags & ST_CONTEXT_FLAG_ROBUST_ACCESS)
 685       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_ROBUST_ACCESS_BIT_ARB;
 686    if (attribs->flags & ST_CONTEXT_FLAG_RESET_NOTIFICATION_ENABLED)
 687       st->ctx->Const.ResetStrategy = GL_LOSE_CONTEXT_ON_RESET_ARB;
 688
 689    /* need to perform version check */
 690    if (attribs->major > 1 || attribs->minor > 0) {
 691       /* Is the actual version less than the requested version?
 692        */
 693       if (st->ctx->Version < attribs->major * 10U + attribs->minor) {
 694          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 695          st_destroy_context(st);
 696          return NULL;
 697       }
 698    }
 699
 700    st->invalidate_on_gl_viewport =
 701       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 702
 703    st->iface.destroy = st_context_destroy;
 704    st->iface.flush = st_context_flush;
 705    st->iface.teximage = st_context_teximage;
 706    st->iface.copy = st_context_copy;
 707    st->iface.share = st_context_share;
 708    st->iface.st_context_private = (void *) smapi;
 709    st->iface.cso_context = st->cso_context;
 710    st->iface.pipe = st->pipe;
 711
 712    *error = ST_CONTEXT_SUCCESS;
 713    return &st->iface;
 714 }
 715
 716 static struct st_context_iface *
 717 st_api_get_current(struct st_api *stapi)
 718 {
 719    GET_CURRENT_CONTEXT(ctx);
 720    struct st_context *st = (ctx) ? ctx->st : NULL;
 721
 722    return (st) ? &st->iface : NULL;
 723 }
 724
 725 static struct st_framebuffer *
 726 st_framebuffer_reuse_or_create(struct st_context *st,
 727                                struct gl_framebuffer *fb,
 728                                struct st_framebuffer_iface *stfbi)
 729 {
 730    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 731
 732    /* dummy framebuffers cant be used as st_framebuffer */
 733    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 734        cur->iface == stfbi) {
 735       /* reuse the current stfb */
 736       st_framebuffer_reference(&stfb, cur);
 737    }
 738    else {
 739       /* create a new one */
 740       stfb = st_framebuffer_create(st, stfbi);
 741    }
 742
 743    return stfb;
 744 }
 745
 746 static boolean
 747 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 748                     struct st_framebuffer_iface *stdrawi,
 749                     struct st_framebuffer_iface *streadi)
 750 {
 751    struct st_context *st = (struct st_context *) stctxi;
 752    struct st_framebuffer *stdraw, *stread;
 753    boolean ret;
 754
 755    _glapi_check_multithread();
 756
 757    if (st) {
 758       /* reuse or create the draw fb */
 759       stdraw = st_framebuffer_reuse_or_create(st,
 760             st->ctx->WinSysDrawBuffer, stdrawi);
 761       if (streadi != stdrawi) {
 762          /* do the same for the read fb */
 763          stread = st_framebuffer_reuse_or_create(st,
 764                st->ctx->WinSysReadBuffer, streadi);
 765       }
 766       else {
 767          stread = NULL;
 768          /* reuse the draw fb for the read fb */
 769          if (stdraw)
 770             st_framebuffer_reference(&stread, stdraw);
 771       }
 772
 773       if (stdraw && stread) {
 774          st_framebuffer_validate(stdraw, st);
 775          if (stread != stdraw)
 776             st_framebuffer_validate(stread, st);
 777
 778          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 779
 780          st->draw_stamp = stdraw->stamp - 1;
 781          st->read_stamp = stread->stamp - 1;
 782          st_context_validate(st, stdraw, stread);
 783       }
 784       else {
 785          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 786          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 787       }
 788
 789       st_framebuffer_reference(&stdraw, NULL);
 790       st_framebuffer_reference(&stread, NULL);
 791    }
 792    else {
 793       ret = _mesa_make_current(NULL, NULL, NULL);
 794    }
 795
 796    return ret;
 797 }
 798
 799 static st_proc_t
 800 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 801 {
 802    return (st_proc_t) _glapi_get_proc_address(procname);
 803 }
 804
 805 static void
 806 st_api_destroy(struct st_api *stapi)
 807 {
 808 }
 809
 810 /**
 811  * Flush the front buffer if the current context renders to the front buffer.
 812  */
 813 void
 814 st_manager_flush_frontbuffer(struct st_context *st)
 815 {
 816    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 817    struct st_renderbuffer *strb = NULL;
 818
 819    if (stfb)
 820       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 821    if (!strb)
 822       return;
 823
 824    /* never a dummy fb */
 825    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 826    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 827 }
 828
 829 /**
 830  * Return the surface of an EGLImage.
 831  * FIXME: I think this should operate on resources, not surfaces
 832  */
 833 struct pipe_surface *
 834 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 835 {
 836    struct st_manager *smapi =
 837       (struct st_manager *) st->iface.st_context_private;
 838    struct st_egl_image stimg;
 839    struct pipe_surface *ps, surf_tmpl;
 840
 841    if (!smapi || !smapi->get_egl_image)
 842       return NULL;
 843
 844    memset(&stimg, 0, sizeof(stimg));
 845    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 846       return NULL;
 847
 848    u_surface_default_template(&surf_tmpl, stimg.texture);
 849    surf_tmpl.u.tex.level = stimg.level;
 850    surf_tmpl.u.tex.first_layer = stimg.layer;
 851    surf_tmpl.u.tex.last_layer = stimg.layer;
 852    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 853    pipe_resource_reference(&stimg.texture, NULL);
 854
 855    return ps;
 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.
 877  */
 878 boolean
 879 st_manager_add_color_renderbuffer(struct st_context *st,
 880                                   struct gl_framebuffer *fb,
 881                                   gl_buffer_index idx)
 882 {
 883    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 884
 885    /* FBO */
 886    if (!stfb)
 887       return FALSE;
 888
 889    if (stfb->Base.Attachment[idx].Renderbuffer)
 890       return TRUE;
 891
 892    switch (idx) {
 893    case BUFFER_FRONT_LEFT:
 894    case BUFFER_BACK_LEFT:
 895    case BUFFER_FRONT_RIGHT:
 896    case BUFFER_BACK_RIGHT:
 897       break;
 898    default:
 899       return FALSE;
 900       break;
 901    }
 902
 903    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 904       return FALSE;
 905
 906    st_framebuffer_update_attachments(stfb);
 907
 908    /*
 909     * Force a call to the state tracker manager to validate the
 910     * new renderbuffer. It might be that there is a window system
 911     * renderbuffer available.
 912     */
 913    if(stfb->iface)
 914       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 915
 916    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 917
 918    return TRUE;
 919 }
 920
 921 static unsigned get_version(struct pipe_screen *screen,
 922                             struct st_config_options *options, gl_api api)
 923 {
 924    struct gl_constants consts = {0};
 925    struct gl_extensions extensions = {0};
 926    GLuint version;
 927
 928    if (_mesa_override_gl_version_contextless(&consts, &api, &version)) {
 929       return version;
 930    }
 931
 932    _mesa_init_constants(&consts, api);
 933    _mesa_init_extensions(&extensions);
 934
 935    st_init_limits(screen, &consts, &extensions);
 936    st_init_extensions(screen, &consts, &extensions, options, GL_TRUE);
 937
 938    return _mesa_get_version(&extensions, &consts, api);
 939 }
 940
 941 static void
 942 st_api_query_versions(struct st_api *stapi, struct st_manager *sm,
 943                       struct st_config_options *options,
 944                       int *gl_core_version,
 945                       int *gl_compat_version,
 946                       int *gl_es1_version,
 947                       int *gl_es2_version)
 948 {
 949    *gl_core_version = get_version(sm->screen, options, API_OPENGL_CORE);
 950    *gl_compat_version = get_version(sm->screen, options, API_OPENGL_COMPAT);
 951    *gl_es1_version = get_version(sm->screen, options, API_OPENGLES);
 952    *gl_es2_version = get_version(sm->screen, options, API_OPENGLES2);
 953 }
 954
 955 static const struct st_api st_gl_api = {
 956    "Mesa " PACKAGE_VERSION,
 957    ST_API_OPENGL,
 958    ST_PROFILE_DEFAULT_MASK |
 959    ST_PROFILE_OPENGL_CORE_MASK |
 960    ST_PROFILE_OPENGL_ES1_MASK |
 961    ST_PROFILE_OPENGL_ES2_MASK |
 962    0,
 963    ST_API_FEATURE_MS_VISUALS_MASK,
 964    st_api_destroy,
 965    st_api_query_versions,
 966    st_api_get_proc_address,
 967    st_api_create_context,
 968    st_api_make_current,
 969    st_api_get_current,
 970 };
 971
 972 struct st_api *
 973 st_gl_api_create(void)
 974 {
 975    return (struct st_api *) &st_gl_api;
 976 }