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/context.h"
  30 #include "main/texobj.h"
  31 #include "main/teximage.h"
  32 #include "main/texstate.h"
  33 #include "main/errors.h"
  34 #include "main/framebuffer.h"
  35 #include "main/fbobject.h"
  36 #include "main/renderbuffer.h"
  37 #include "main/version.h"
  38 #include "st_texture.h"
  39
  40 #include "st_context.h"
  41 #include "st_format.h"
  42 #include "st_cb_fbo.h"
  43 #include "st_cb_flush.h"
  44 #include "st_manager.h"
  45
  46 #include "state_tracker/st_gl_api.h"
  47
  48 #include "pipe/p_context.h"
  49 #include "pipe/p_screen.h"
  50 #include "util/u_format.h"
  51 #include "util/u_pointer.h"
  52 #include "util/u_inlines.h"
  53 #include "util/u_atomic.h"
  54 #include "util/u_surface.h"
  55
  56 /**
  57  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  58  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  59  * We'll only return non-null for window system framebuffers.
  60  * Note that this function may fail.
  61  */
  62 static INLINE struct st_framebuffer *
  63 st_ws_framebuffer(struct gl_framebuffer *fb)
  64 {
  65    /* FBO cannot be casted.  See st_new_framebuffer */
  66    if (fb && _mesa_is_winsys_fbo(fb))
  67       return (struct st_framebuffer *) fb;
  68    return NULL;
  69 }
  70
  71 /**
  72  * Map an attachment to a buffer index.
  73  */
  74 static INLINE gl_buffer_index
  75 attachment_to_buffer_index(enum st_attachment_type statt)
  76 {
  77    gl_buffer_index index;
  78
  79    switch (statt) {
  80    case ST_ATTACHMENT_FRONT_LEFT:
  81       index = BUFFER_FRONT_LEFT;
  82       break;
  83    case ST_ATTACHMENT_BACK_LEFT:
  84       index = BUFFER_BACK_LEFT;
  85       break;
  86    case ST_ATTACHMENT_FRONT_RIGHT:
  87       index = BUFFER_FRONT_RIGHT;
  88       break;
  89    case ST_ATTACHMENT_BACK_RIGHT:
  90       index = BUFFER_BACK_RIGHT;
  91       break;
  92    case ST_ATTACHMENT_DEPTH_STENCIL:
  93       index = BUFFER_DEPTH;
  94       break;
  95    case ST_ATTACHMENT_ACCUM:
  96       index = BUFFER_ACCUM;
  97       break;
  98    case ST_ATTACHMENT_SAMPLE:
  99    default:
 100       index = BUFFER_COUNT;
 101       break;
 102    }
 103
 104    return index;
 105 }
 106
 107 /**
 108  * Map a buffer index to an attachment.
 109  */
 110 static INLINE enum st_attachment_type
 111 buffer_index_to_attachment(gl_buffer_index index)
 112 {
 113    enum st_attachment_type statt;
 114
 115    switch (index) {
 116    case BUFFER_FRONT_LEFT:
 117       statt = ST_ATTACHMENT_FRONT_LEFT;
 118       break;
 119    case BUFFER_BACK_LEFT:
 120       statt = ST_ATTACHMENT_BACK_LEFT;
 121       break;
 122    case BUFFER_FRONT_RIGHT:
 123       statt = ST_ATTACHMENT_FRONT_RIGHT;
 124       break;
 125    case BUFFER_BACK_RIGHT:
 126       statt = ST_ATTACHMENT_BACK_RIGHT;
 127       break;
 128    case BUFFER_DEPTH:
 129       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 130       break;
 131    case BUFFER_ACCUM:
 132       statt = ST_ATTACHMENT_ACCUM;
 133       break;
 134    default:
 135       statt = ST_ATTACHMENT_INVALID;
 136       break;
 137    }
 138
 139    return statt;
 140 }
 141
 142 /**
 143  * Make sure a context picks up the latest cached state of the
 144  * drawables it binds to.
 145  */
 146 static void
 147 st_context_validate(struct st_context *st,
 148                     struct st_framebuffer *stdraw,
 149                     struct st_framebuffer *stread)
 150 {
 151     if (stdraw && stdraw->stamp != st->draw_stamp) {
 152        st->dirty.st |= ST_NEW_FRAMEBUFFER;
 153        _mesa_resize_framebuffer(st->ctx, &stdraw->Base,
 154                                 stdraw->Base.Width,
 155                                 stdraw->Base.Height);
 156        st->draw_stamp = stdraw->stamp;
 157     }
 158
 159     if (stread && stread->stamp != st->read_stamp) {
 160        if (stread != stdraw) {
 161           st->dirty.st |= ST_NEW_FRAMEBUFFER;
 162           _mesa_resize_framebuffer(st->ctx, &stread->Base,
 163                                    stread->Base.Width,
 164                                    stread->Base.Height);
 165        }
 166        st->read_stamp = stread->stamp;
 167     }
 168 }
 169
 170 /**
 171  * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 172  * The context is only used for creating pipe surfaces and for calling
 173  * _mesa_resize_framebuffer().
 174  * (That should probably be rethought, since those surfaces become
 175  * drawable state, not context state, and can be freed by another pipe
 176  * context).
 177  */
 178 static void
 179 st_framebuffer_validate(struct st_framebuffer *stfb,
 180                         struct st_context *st)
 181 {
 182    struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
 183    uint width, height;
 184    unsigned i;
 185    boolean changed = FALSE;
 186    int32_t new_stamp = p_atomic_read(&stfb->iface->stamp);
 187
 188    if (stfb->iface_stamp == new_stamp)
 189       return;
 190
 191    /* validate the fb */
 192    do {
 193       if (!stfb->iface->validate(&st->iface, stfb->iface, stfb->statts,
 194                                  stfb->num_statts, textures))
 195          return;
 196
 197       stfb->iface_stamp = new_stamp;
 198       new_stamp = p_atomic_read(&stfb->iface->stamp);
 199    } while(stfb->iface_stamp != new_stamp);
 200
 201    width = stfb->Base.Width;
 202    height = stfb->Base.Height;
 203
 204    for (i = 0; i < stfb->num_statts; i++) {
 205       struct st_renderbuffer *strb;
 206       struct pipe_surface *ps, surf_tmpl;
 207       gl_buffer_index idx;
 208
 209       if (!textures[i])
 210          continue;
 211
 212       idx = attachment_to_buffer_index(stfb->statts[i]);
 213       if (idx >= BUFFER_COUNT) {
 214          pipe_resource_reference(&textures[i], NULL);
 215          continue;
 216       }
 217
 218       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 219       assert(strb);
 220       if (strb->texture == textures[i]) {
 221          pipe_resource_reference(&textures[i], NULL);
 222          continue;
 223       }
 224
 225       u_surface_default_template(&surf_tmpl, textures[i]);
 226       ps = st->pipe->create_surface(st->pipe, textures[i], &surf_tmpl);
 227       if (ps) {
 228          pipe_surface_reference(&strb->surface, ps);
 229          pipe_resource_reference(&strb->texture, ps->texture);
 230          /* ownership transfered */
 231          pipe_surface_reference(&ps, NULL);
 232
 233          changed = TRUE;
 234
 235          strb->Base.Width = strb->surface->width;
 236          strb->Base.Height = strb->surface->height;
 237
 238          width = strb->Base.Width;
 239          height = strb->Base.Height;
 240       }
 241
 242       pipe_resource_reference(&textures[i], NULL);
 243    }
 244
 245    if (changed) {
 246       ++stfb->stamp;
 247       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 248    }
 249 }
 250
 251 /**
 252  * Update the attachments to validate by looping the existing renderbuffers.
 253  */
 254 static void
 255 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 256 {
 257    gl_buffer_index idx;
 258
 259    stfb->num_statts = 0;
 260    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 261       struct st_renderbuffer *strb;
 262       enum st_attachment_type statt;
 263
 264       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 265       if (!strb || strb->software)
 266          continue;
 267
 268       statt = buffer_index_to_attachment(idx);
 269       if (statt != ST_ATTACHMENT_INVALID &&
 270           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 271          stfb->statts[stfb->num_statts++] = statt;
 272    }
 273    stfb->stamp++;
 274 }
 275
 276 /**
 277  * Add a renderbuffer to the framebuffer.
 278  */
 279 static boolean
 280 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 281                                 gl_buffer_index idx)
 282 {
 283    struct gl_renderbuffer *rb;
 284    enum pipe_format format;
 285    boolean sw;
 286
 287    if (!stfb->iface)
 288       return FALSE;
 289
 290    /* do not distinguish depth/stencil buffers */
 291    if (idx == BUFFER_STENCIL)
 292       idx = BUFFER_DEPTH;
 293
 294    switch (idx) {
 295    case BUFFER_DEPTH:
 296       format = stfb->iface->visual->depth_stencil_format;
 297       sw = FALSE;
 298       break;
 299    case BUFFER_ACCUM:
 300       format = stfb->iface->visual->accum_format;
 301       sw = TRUE;
 302       break;
 303    default:
 304       format = stfb->iface->visual->color_format;
 305       if (stfb->Base.Visual.sRGBCapable)
 306          format = util_format_srgb(format);
 307       sw = FALSE;
 308       break;
 309    }
 310
 311    if (format == PIPE_FORMAT_NONE)
 312       return FALSE;
 313
 314    rb = st_new_renderbuffer_fb(format, stfb->iface->visual->samples, sw);
 315    if (!rb)
 316       return FALSE;
 317
 318    if (idx != BUFFER_DEPTH) {
 319       _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 320    }
 321    else {
 322       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
 323          _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
 324       if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
 325          _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 326    }
 327
 328    return TRUE;
 329 }
 330
 331 /**
 332  * Intialize a struct gl_config from a visual.
 333  */
 334 static void
 335 st_visual_to_context_mode(const struct st_visual *visual,
 336                           struct gl_config *mode)
 337 {
 338    memset(mode, 0, sizeof(*mode));
 339
 340    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 341       mode->doubleBufferMode = GL_TRUE;
 342    if (st_visual_have_buffers(visual,
 343             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 344       mode->stereoMode = GL_TRUE;
 345
 346    if (visual->color_format != PIPE_FORMAT_NONE) {
 347       mode->rgbMode = GL_TRUE;
 348
 349       mode->redBits =
 350          util_format_get_component_bits(visual->color_format,
 351                UTIL_FORMAT_COLORSPACE_RGB, 0);
 352       mode->greenBits =
 353          util_format_get_component_bits(visual->color_format,
 354                UTIL_FORMAT_COLORSPACE_RGB, 1);
 355       mode->blueBits =
 356          util_format_get_component_bits(visual->color_format,
 357                UTIL_FORMAT_COLORSPACE_RGB, 2);
 358       mode->alphaBits =
 359          util_format_get_component_bits(visual->color_format,
 360                UTIL_FORMAT_COLORSPACE_RGB, 3);
 361
 362       mode->rgbBits = mode->redBits +
 363          mode->greenBits + mode->blueBits + mode->alphaBits;
 364    }
 365
 366    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 367       mode->depthBits =
 368          util_format_get_component_bits(visual->depth_stencil_format,
 369                UTIL_FORMAT_COLORSPACE_ZS, 0);
 370       mode->stencilBits =
 371          util_format_get_component_bits(visual->depth_stencil_format,
 372                UTIL_FORMAT_COLORSPACE_ZS, 1);
 373
 374       mode->haveDepthBuffer = mode->depthBits > 0;
 375       mode->haveStencilBuffer = mode->stencilBits > 0;
 376    }
 377
 378    if (visual->accum_format != PIPE_FORMAT_NONE) {
 379       mode->haveAccumBuffer = GL_TRUE;
 380
 381       mode->accumRedBits =
 382          util_format_get_component_bits(visual->accum_format,
 383                UTIL_FORMAT_COLORSPACE_RGB, 0);
 384       mode->accumGreenBits =
 385          util_format_get_component_bits(visual->accum_format,
 386                UTIL_FORMAT_COLORSPACE_RGB, 1);
 387       mode->accumBlueBits =
 388          util_format_get_component_bits(visual->accum_format,
 389                UTIL_FORMAT_COLORSPACE_RGB, 2);
 390       mode->accumAlphaBits =
 391          util_format_get_component_bits(visual->accum_format,
 392                UTIL_FORMAT_COLORSPACE_RGB, 3);
 393    }
 394
 395    if (visual->samples > 1) {
 396       mode->sampleBuffers = 1;
 397       mode->samples = visual->samples;
 398    }
 399 }
 400
 401 /**
 402  * Create a framebuffer from a manager interface.
 403  */
 404 static struct st_framebuffer *
 405 st_framebuffer_create(struct st_context *st,
 406                       struct st_framebuffer_iface *stfbi)
 407 {
 408    struct st_framebuffer *stfb;
 409    struct gl_config mode;
 410    gl_buffer_index idx;
 411
 412    if (!stfbi)
 413       return NULL;
 414
 415    stfb = CALLOC_STRUCT(st_framebuffer);
 416    if (!stfb)
 417       return NULL;
 418
 419    st_visual_to_context_mode(stfbi->visual, &mode);
 420
 421    /*
 422     * For desktop GL, sRGB framebuffer write is controlled by both the
 423     * capability of the framebuffer and GL_FRAMEBUFFER_SRGB.  We should
 424     * advertise the capability when the pipe driver (and core Mesa) supports
 425     * it so that applications can enable sRGB write when they want to.
 426     *
 427     * This is not to be confused with GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB.  When
 428     * the attribute is GLX_TRUE, it tells the st manager to pick a color
 429     * format such that util_format_srgb(visual->color_format) can be supported
 430     * by the pipe driver.  We still need to advertise the capability here.
 431     *
 432     * For GLES, however, sRGB framebuffer write is controlled only by the
 433     * capability of the framebuffer.  There is GL_EXT_sRGB_write_control to
 434     * give applications the control back, but sRGB write is still enabled by
 435     * default.  To avoid unexpected results, we should not advertise the
 436     * capability.  This could change when we add support for
 437     * EGL_KHR_gl_colorspace.
 438     */
 439    if (_mesa_is_desktop_gl(st->ctx)) {
 440       struct pipe_screen *screen = st->pipe->screen;
 441       const enum pipe_format srgb_format =
 442          util_format_srgb(stfbi->visual->color_format);
 443
 444       if (srgb_format != PIPE_FORMAT_NONE &&
 445           st_pipe_format_to_mesa_format(srgb_format) != MESA_FORMAT_NONE &&
 446           screen->is_format_supported(screen, srgb_format,
 447                                       PIPE_TEXTURE_2D, stfbi->visual->samples,
 448                                       PIPE_BIND_RENDER_TARGET))
 449          mode.sRGBCapable = GL_TRUE;
 450    }
 451
 452    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 453
 454    stfb->iface = stfbi;
 455    stfb->iface_stamp = p_atomic_read(&stfbi->stamp) - 1;
 456
 457    /* add the color buffer */
 458    idx = stfb->Base._ColorDrawBufferIndexes[0];
 459    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 460       free(stfb);
 461       return NULL;
 462    }
 463
 464    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 465    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 466
 467    stfb->stamp = 0;
 468    st_framebuffer_update_attachments(stfb);
 469
 470    return stfb;
 471 }
 472
 473 /**
 474  * Reference a framebuffer.
 475  */
 476 static void
 477 st_framebuffer_reference(struct st_framebuffer **ptr,
 478                          struct st_framebuffer *stfb)
 479 {
 480    struct gl_framebuffer *fb = &stfb->Base;
 481    _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
 482 }
 483
 484 static void
 485 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 486                  struct pipe_fence_handle **fence)
 487 {
 488    struct st_context *st = (struct st_context *) stctxi;
 489    unsigned pipe_flags = 0;
 490
 491    if (flags & ST_FLUSH_END_OF_FRAME) {
 492       pipe_flags |= PIPE_FLUSH_END_OF_FRAME;
 493    }
 494
 495    st_flush(st, fence, pipe_flags);
 496    if (flags & ST_FLUSH_FRONT)
 497       st_manager_flush_frontbuffer(st);
 498 }
 499
 500 static boolean
 501 st_context_teximage(struct st_context_iface *stctxi,
 502                     enum st_texture_type tex_type,
 503                     int level, enum pipe_format pipe_format,
 504                     struct pipe_resource *tex, boolean mipmap)
 505 {
 506    struct st_context *st = (struct st_context *) stctxi;
 507    struct gl_context *ctx = st->ctx;
 508    struct gl_texture_object *texObj;
 509    struct gl_texture_image *texImage;
 510    struct st_texture_object *stObj;
 511    struct st_texture_image *stImage;
 512    GLenum internalFormat;
 513    GLuint width, height, depth;
 514    GLenum target;
 515
 516    switch (tex_type) {
 517    case ST_TEXTURE_1D:
 518       target = GL_TEXTURE_1D;
 519       break;
 520    case ST_TEXTURE_2D:
 521       target = GL_TEXTURE_2D;
 522       break;
 523    case ST_TEXTURE_3D:
 524       target = GL_TEXTURE_3D;
 525       break;
 526    case ST_TEXTURE_RECT:
 527       target = GL_TEXTURE_RECTANGLE_ARB;
 528       break;
 529    default:
 530       return FALSE;
 531    }
 532
 533    texObj = _mesa_get_current_tex_object(ctx, target);
 534
 535    _mesa_lock_texture(ctx, texObj);
 536
 537    stObj = st_texture_object(texObj);
 538    /* switch to surface based */
 539    if (!stObj->surface_based) {
 540       _mesa_clear_texture_object(ctx, texObj);
 541       stObj->surface_based = GL_TRUE;
 542    }
 543
 544    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 545    stImage = st_texture_image(texImage);
 546    if (tex) {
 547       mesa_format texFormat = st_pipe_format_to_mesa_format(pipe_format);
 548
 549       if (util_format_has_alpha(tex->format))
 550          internalFormat = GL_RGBA;
 551       else
 552          internalFormat = GL_RGB;
 553
 554       _mesa_init_teximage_fields(ctx, texImage,
 555                                  tex->width0, tex->height0, 1, 0,
 556                                  internalFormat, texFormat);
 557
 558       width = tex->width0;
 559       height = tex->height0;
 560       depth = tex->depth0;
 561
 562       /* grow the image size until we hit level = 0 */
 563       while (level > 0) {
 564          if (width != 1)
 565             width <<= 1;
 566          if (height != 1)
 567             height <<= 1;
 568          if (depth != 1)
 569             depth <<= 1;
 570          level--;
 571       }
 572    }
 573    else {
 574       _mesa_clear_texture_image(ctx, texImage);
 575       width = height = depth = 0;
 576    }
 577
 578    pipe_resource_reference(&stImage->pt, tex);
 579    stObj->width0 = width;
 580    stObj->height0 = height;
 581    stObj->depth0 = depth;
 582    stObj->surface_format = pipe_format;
 583
 584    _mesa_dirty_texobj(ctx, texObj);
 585    _mesa_unlock_texture(ctx, texObj);
 586
 587    return TRUE;
 588 }
 589
 590 static void
 591 st_context_copy(struct st_context_iface *stctxi,
 592                 struct st_context_iface *stsrci, unsigned mask)
 593 {
 594    struct st_context *st = (struct st_context *) stctxi;
 595    struct st_context *src = (struct st_context *) stsrci;
 596
 597    _mesa_copy_context(src->ctx, st->ctx, mask);
 598 }
 599
 600 static boolean
 601 st_context_share(struct st_context_iface *stctxi,
 602                  struct st_context_iface *stsrci)
 603 {
 604    struct st_context *st = (struct st_context *) stctxi;
 605    struct st_context *src = (struct st_context *) stsrci;
 606
 607    return _mesa_share_state(st->ctx, src->ctx);
 608 }
 609
 610 static void
 611 st_context_destroy(struct st_context_iface *stctxi)
 612 {
 613    struct st_context *st = (struct st_context *) stctxi;
 614    st_destroy_context(st);
 615 }
 616
 617 static struct st_context_iface *
 618 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 619                       const struct st_context_attribs *attribs,
 620                       enum st_context_error *error,
 621                       struct st_context_iface *shared_stctxi)
 622 {
 623    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 624    struct st_context *st;
 625    struct pipe_context *pipe;
 626    struct gl_config mode;
 627    gl_api api;
 628
 629    if (!(stapi->profile_mask & (1 << attribs->profile)))
 630       return NULL;
 631
 632    switch (attribs->profile) {
 633    case ST_PROFILE_DEFAULT:
 634       api = API_OPENGL_COMPAT;
 635       break;
 636    case ST_PROFILE_OPENGL_ES1:
 637       api = API_OPENGLES;
 638       break;
 639    case ST_PROFILE_OPENGL_ES2:
 640       api = API_OPENGLES2;
 641       break;
 642    case ST_PROFILE_OPENGL_CORE:
 643       api = API_OPENGL_CORE;
 644       break;
 645    default:
 646       *error = ST_CONTEXT_ERROR_BAD_API;
 647       return NULL;
 648       break;
 649    }
 650
 651    pipe = smapi->screen->context_create(smapi->screen, NULL);
 652    if (!pipe) {
 653       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 654       return NULL;
 655    }
 656
 657    st_visual_to_context_mode(&attribs->visual, &mode);
 658    st = st_create_context(api, pipe, &mode, shared_ctx, &attribs->options);
 659    if (!st) {
 660       *error = ST_CONTEXT_ERROR_NO_MEMORY;
 661       pipe->destroy(pipe);
 662       return NULL;
 663    }
 664
 665    if (attribs->flags & ST_CONTEXT_FLAG_DEBUG){
 666       struct gl_debug_state *debug = _mesa_get_debug_state(st->ctx);
 667       if (!debug) {
 668          *error = ST_CONTEXT_ERROR_NO_MEMORY;
 669          return NULL;
 670       }
 671       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_DEBUG_BIT;
 672       debug->DebugOutput = GL_TRUE;
 673    }
 674
 675    if (attribs->flags & ST_CONTEXT_FLAG_FORWARD_COMPATIBLE)
 676       st->ctx->Const.ContextFlags |= GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT;
 677
 678    /* need to perform version check */
 679    if (attribs->major > 1 || attribs->minor > 0) {
 680       /* Is the actual version less than the requested version?
 681        */
 682       if (st->ctx->Version < attribs->major * 10 + attribs->minor) {
 683          *error = ST_CONTEXT_ERROR_BAD_VERSION;
 684          st_destroy_context(st);
 685          return NULL;
 686       }
 687    }
 688
 689    st->invalidate_on_gl_viewport =
 690       smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);
 691
 692    st->iface.destroy = st_context_destroy;
 693    st->iface.flush = st_context_flush;
 694    st->iface.teximage = st_context_teximage;
 695    st->iface.copy = st_context_copy;
 696    st->iface.share = st_context_share;
 697    st->iface.st_context_private = (void *) smapi;
 698    st->iface.cso_context = st->cso_context;
 699    st->iface.pipe = st->pipe;
 700
 701    *error = ST_CONTEXT_SUCCESS;
 702    return &st->iface;
 703 }
 704
 705 static struct st_context_iface *
 706 st_api_get_current(struct st_api *stapi)
 707 {
 708    GET_CURRENT_CONTEXT(ctx);
 709    struct st_context *st = (ctx) ? ctx->st : NULL;
 710
 711    return (st) ? &st->iface : NULL;
 712 }
 713
 714 static struct st_framebuffer *
 715 st_framebuffer_reuse_or_create(struct st_context *st,
 716                                struct gl_framebuffer *fb,
 717                                struct st_framebuffer_iface *stfbi)
 718 {
 719    struct st_framebuffer *cur = st_ws_framebuffer(fb), *stfb = NULL;
 720
 721    /* dummy framebuffers cant be used as st_framebuffer */
 722    if (cur && &cur->Base != _mesa_get_incomplete_framebuffer() &&
 723        cur->iface == stfbi) {
 724       /* reuse the current stfb */
 725       st_framebuffer_reference(&stfb, cur);
 726    }
 727    else {
 728       /* create a new one */
 729       stfb = st_framebuffer_create(st, stfbi);
 730    }
 731
 732    return stfb;
 733 }
 734
 735 static boolean
 736 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 737                     struct st_framebuffer_iface *stdrawi,
 738                     struct st_framebuffer_iface *streadi)
 739 {
 740    struct st_context *st = (struct st_context *) stctxi;
 741    struct st_framebuffer *stdraw, *stread;
 742    boolean ret;
 743
 744    _glapi_check_multithread();
 745
 746    if (st) {
 747       /* reuse or create the draw fb */
 748       stdraw = st_framebuffer_reuse_or_create(st,
 749             st->ctx->WinSysDrawBuffer, stdrawi);
 750       if (streadi != stdrawi) {
 751          /* do the same for the read fb */
 752          stread = st_framebuffer_reuse_or_create(st,
 753                st->ctx->WinSysReadBuffer, streadi);
 754       }
 755       else {
 756          stread = NULL;
 757          /* reuse the draw fb for the read fb */
 758          if (stdraw)
 759             st_framebuffer_reference(&stread, stdraw);
 760       }
 761
 762       if (stdraw && stread) {
 763          st_framebuffer_validate(stdraw, st);
 764          if (stread != stdraw)
 765             st_framebuffer_validate(stread, st);
 766
 767          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 768
 769          st->draw_stamp = stdraw->stamp - 1;
 770          st->read_stamp = stread->stamp - 1;
 771          st_context_validate(st, stdraw, stread);
 772       }
 773       else {
 774          struct gl_framebuffer *incomplete = _mesa_get_incomplete_framebuffer();
 775          ret = _mesa_make_current(st->ctx, incomplete, incomplete);
 776       }
 777
 778       st_framebuffer_reference(&stdraw, NULL);
 779       st_framebuffer_reference(&stread, NULL);
 780    }
 781    else {
 782       ret = _mesa_make_current(NULL, NULL, NULL);
 783    }
 784
 785    return ret;
 786 }
 787
 788 static st_proc_t
 789 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 790 {
 791    return (st_proc_t) _glapi_get_proc_address(procname);
 792 }
 793
 794 static void
 795 st_api_destroy(struct st_api *stapi)
 796 {
 797 }
 798
 799 /**
 800  * Flush the front buffer if the current context renders to the front buffer.
 801  */
 802 void
 803 st_manager_flush_frontbuffer(struct st_context *st)
 804 {
 805    struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
 806    struct st_renderbuffer *strb = NULL;
 807
 808    if (stfb)
 809       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 810    if (!strb)
 811       return;
 812
 813    /* never a dummy fb */
 814    assert(&stfb->Base != _mesa_get_incomplete_framebuffer());
 815    stfb->iface->flush_front(&st->iface, stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 816 }
 817
 818 /**
 819  * Return the surface of an EGLImage.
 820  * FIXME: I think this should operate on resources, not surfaces
 821  */
 822 struct pipe_surface *
 823 st_manager_get_egl_image_surface(struct st_context *st, void *eglimg)
 824 {
 825    struct st_manager *smapi =
 826       (struct st_manager *) st->iface.st_context_private;
 827    struct st_egl_image stimg;
 828    struct pipe_surface *ps, surf_tmpl;
 829
 830    if (!smapi || !smapi->get_egl_image)
 831       return NULL;
 832
 833    memset(&stimg, 0, sizeof(stimg));
 834    if (!smapi->get_egl_image(smapi, eglimg, &stimg))
 835       return NULL;
 836
 837    u_surface_default_template(&surf_tmpl, stimg.texture);
 838    surf_tmpl.u.tex.level = stimg.level;
 839    surf_tmpl.u.tex.first_layer = stimg.layer;
 840    surf_tmpl.u.tex.last_layer = stimg.layer;
 841    ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
 842    pipe_resource_reference(&stimg.texture, NULL);
 843
 844    return ps;
 845 }
 846
 847 /**
 848  * Re-validate the framebuffers.
 849  */
 850 void
 851 st_manager_validate_framebuffers(struct st_context *st)
 852 {
 853    struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
 854    struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);
 855
 856    if (stdraw)
 857       st_framebuffer_validate(stdraw, st);
 858    if (stread && stread != stdraw)
 859       st_framebuffer_validate(stread, st);
 860
 861    st_context_validate(st, stdraw, stread);
 862 }
 863
 864 /**
 865  * Add a color renderbuffer on demand.
 866  */
 867 boolean
 868 st_manager_add_color_renderbuffer(struct st_context *st,
 869                                   struct gl_framebuffer *fb,
 870                                   gl_buffer_index idx)
 871 {
 872    struct st_framebuffer *stfb = st_ws_framebuffer(fb);
 873
 874    /* FBO */
 875    if (!stfb)
 876       return FALSE;
 877
 878    if (stfb->Base.Attachment[idx].Renderbuffer)
 879       return TRUE;
 880
 881    switch (idx) {
 882    case BUFFER_FRONT_LEFT:
 883    case BUFFER_BACK_LEFT:
 884    case BUFFER_FRONT_RIGHT:
 885    case BUFFER_BACK_RIGHT:
 886       break;
 887    default:
 888       return FALSE;
 889       break;
 890    }
 891
 892    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 893       return FALSE;
 894
 895    st_framebuffer_update_attachments(stfb);
 896
 897    /*
 898     * Force a call to the state tracker manager to validate the
 899     * new renderbuffer. It might be that there is a window system
 900     * renderbuffer available.
 901     */
 902    if(stfb->iface)
 903       stfb->iface_stamp = p_atomic_read(&stfb->iface->stamp) - 1;
 904
 905    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 906
 907    return TRUE;
 908 }
 909
 910 static const struct st_api st_gl_api = {
 911    "Mesa " PACKAGE_VERSION,
 912    ST_API_OPENGL,
 913    ST_PROFILE_DEFAULT_MASK |
 914    ST_PROFILE_OPENGL_CORE_MASK |
 915    ST_PROFILE_OPENGL_ES1_MASK |
 916    ST_PROFILE_OPENGL_ES2_MASK |
 917    0,
 918    ST_API_FEATURE_MS_VISUALS_MASK,
 919    st_api_destroy,
 920    st_api_get_proc_address,
 921    st_api_create_context,
 922    st_api_make_current,
 923    st_api_get_current,
 924 };
 925
 926 struct st_api *
 927 st_gl_api_create(void)
 928 {
 929    return (struct st_api *) &st_gl_api;
 930 }