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