src/mesa/state_tracker/st_manager.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.9
   4  *
   5  * Copyright (C) 2010 LunarG Inc.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Chia-I Wu <olv@lunarg.com>
  26  */
  27
  28 #include "state_tracker/st_api.h"
  29
  30 #include "pipe/p_context.h"
  31 #include "pipe/p_screen.h"
  32 #include "util/u_format.h"
  33 #include "util/u_pointer.h"
  34 #include "util/u_inlines.h"
  35 #include "util/u_atomic.h"
  36
  37 #include "main/mtypes.h"
  38 #include "main/context.h"
  39 #include "main/texobj.h"
  40 #include "main/teximage.h"
  41 #include "main/texstate.h"
  42 #include "main/texfetch.h"
  43 #include "main/fbobject.h"
  44 #include "main/framebuffer.h"
  45 #include "main/renderbuffer.h"
  46 #include "st_texture.h"
  47
  48 #include "st_context.h"
  49 #include "st_format.h"
  50 #include "st_cb_fbo.h"
  51 #include "st_manager.h"
  52
  53 /* these functions are defined in st_context.c */
  54 struct st_context *
  55 st_create_context(struct pipe_context *pipe,
  56                   const __GLcontextModes *visual,
  57                   struct st_context *share);
  58 void st_destroy_context(struct st_context *st);
  59 void st_flush(struct st_context *st, uint pipeFlushFlags,
  60               struct pipe_fence_handle **fence);
  61
  62 /**
  63  * Map an attachment to a buffer index.
  64  */
  65 static INLINE gl_buffer_index
  66 attachment_to_buffer_index(enum st_attachment_type statt)
  67 {
  68    gl_buffer_index index;
  69
  70    switch (statt) {
  71    case ST_ATTACHMENT_FRONT_LEFT:
  72       index = BUFFER_FRONT_LEFT;
  73       break;
  74    case ST_ATTACHMENT_BACK_LEFT:
  75       index = BUFFER_BACK_LEFT;
  76       break;
  77    case ST_ATTACHMENT_FRONT_RIGHT:
  78       index = BUFFER_FRONT_RIGHT;
  79       break;
  80    case ST_ATTACHMENT_BACK_RIGHT:
  81       index = BUFFER_BACK_RIGHT;
  82       break;
  83    case ST_ATTACHMENT_DEPTH_STENCIL:
  84       index = BUFFER_DEPTH;
  85       break;
  86    case ST_ATTACHMENT_ACCUM:
  87       index = BUFFER_ACCUM;
  88       break;
  89    case ST_ATTACHMENT_SAMPLE:
  90    default:
  91       index = BUFFER_COUNT;
  92       break;
  93    }
  94
  95    return index;
  96 }
  97
  98 /**
  99  * Map a buffer index to an attachment.
 100  */
 101 static INLINE enum st_attachment_type
 102 buffer_index_to_attachment(gl_buffer_index index)
 103 {
 104    enum st_attachment_type statt;
 105
 106    switch (index) {
 107    case BUFFER_FRONT_LEFT:
 108       statt = ST_ATTACHMENT_FRONT_LEFT;
 109       break;
 110    case BUFFER_BACK_LEFT:
 111       statt = ST_ATTACHMENT_BACK_LEFT;
 112       break;
 113    case BUFFER_FRONT_RIGHT:
 114       statt = ST_ATTACHMENT_FRONT_RIGHT;
 115       break;
 116    case BUFFER_BACK_RIGHT:
 117       statt = ST_ATTACHMENT_BACK_RIGHT;
 118       break;
 119    case BUFFER_DEPTH:
 120       statt = ST_ATTACHMENT_DEPTH_STENCIL;
 121       break;
 122    case BUFFER_ACCUM:
 123       statt = ST_ATTACHMENT_ACCUM;
 124       break;
 125    default:
 126       statt = ST_ATTACHMENT_INVALID;
 127       break;
 128    }
 129
 130    return statt;
 131 }
 132
 133 /**
 134  * Validate a framebuffer and update the states of the context.
 135  */
 136 static void
 137 st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
 138 {
 139    struct pipe_screen *screen = st->pipe->screen;
 140    struct pipe_texture *textures[ST_ATTACHMENT_COUNT];
 141    uint width, height;
 142    unsigned i;
 143    boolean changed = FALSE;
 144
 145    if (!p_atomic_read(&stfb->revalidate))
 146       return;
 147
 148    /* validate the fb */
 149    if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
 150       return;
 151
 152    width = stfb->Base.Width;
 153    height = stfb->Base.Height;
 154
 155    for (i = 0; i < stfb->num_statts; i++) {
 156       struct st_renderbuffer *strb;
 157       struct pipe_surface *ps;
 158       gl_buffer_index idx;
 159
 160       if (!textures[i])
 161          continue;
 162
 163       idx = attachment_to_buffer_index(stfb->statts[i]);
 164       if (idx >= BUFFER_COUNT) {
 165          pipe_texture_reference(&textures[i], NULL);
 166          continue;
 167       }
 168
 169       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 170       assert(strb);
 171       if (strb->texture == textures[i]) {
 172          pipe_texture_reference(&textures[i], NULL);
 173          continue;
 174       }
 175
 176       ps = screen->get_tex_surface(screen, textures[i], 0, 0, 0,
 177             PIPE_BUFFER_USAGE_GPU_READ | PIPE_BUFFER_USAGE_GPU_WRITE);
 178       if (ps) {
 179          pipe_surface_reference(&strb->surface, ps);
 180          pipe_texture_reference(&strb->texture, ps->texture);
 181          /* ownership transfered */
 182          pipe_surface_reference(&ps, NULL);
 183
 184          changed = TRUE;
 185
 186          strb->Base.Width = strb->surface->width;
 187          strb->Base.Height = strb->surface->height;
 188
 189          width = strb->Base.Width;
 190          height = strb->Base.Height;
 191       }
 192
 193       pipe_texture_reference(&textures[i], NULL);
 194    }
 195
 196    if (changed) {
 197       st->dirty.st |= ST_NEW_FRAMEBUFFER;
 198       _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);
 199
 200       assert(stfb->Base.Width == width);
 201       assert(stfb->Base.Height == height);
 202    }
 203
 204    p_atomic_set(&stfb->revalidate, FALSE);
 205 }
 206
 207 /**
 208  * Update the attachments to validate.
 209  */
 210 static void
 211 st_framebuffer_update_attachments(struct st_framebuffer *stfb)
 212 {
 213    gl_buffer_index idx;
 214
 215    stfb->num_statts = 0;
 216    for (idx = 0; idx < BUFFER_COUNT; idx++) {
 217       struct st_renderbuffer *strb;
 218       enum st_attachment_type statt;
 219
 220       strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
 221       if (!strb || strb->software)
 222          continue;
 223
 224       statt = buffer_index_to_attachment(idx);
 225       if (statt != ST_ATTACHMENT_INVALID &&
 226           st_visual_have_buffers(stfb->iface->visual, 1 << statt))
 227          stfb->statts[stfb->num_statts++] = statt;
 228    }
 229 }
 230
 231 /**
 232  * Add a renderbuffer to the framebuffer.
 233  */
 234 static boolean
 235 st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
 236                                 gl_buffer_index idx)
 237 {
 238    struct gl_renderbuffer *rb;
 239    enum pipe_format format;
 240    int samples;
 241    boolean sw;
 242
 243    /* do not distinguish depth/stencil buffers */
 244    if (idx == BUFFER_STENCIL)
 245       idx = BUFFER_DEPTH;
 246
 247    switch (idx) {
 248    case BUFFER_DEPTH:
 249       format = stfb->iface->visual->depth_stencil_format;
 250       sw = FALSE;
 251       break;
 252    case BUFFER_ACCUM:
 253       format = stfb->iface->visual->accum_format;
 254       sw = TRUE;
 255       break;
 256    default:
 257       format = stfb->iface->visual->color_format;
 258       sw = FALSE;
 259       break;
 260    }
 261
 262    if (format == PIPE_FORMAT_NONE)
 263       return FALSE;
 264
 265    samples = stfb->iface->visual->samples;
 266    if (!samples)
 267       samples = st_get_msaa();
 268
 269    rb = st_new_renderbuffer_fb(format, samples, sw);
 270    if (!rb)
 271       return FALSE;
 272
 273    _mesa_add_renderbuffer(&stfb->Base, idx, rb);
 274    if (idx == BUFFER_DEPTH)
 275       _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
 276
 277    return TRUE;
 278 }
 279
 280 /**
 281  * Intialize a __GLcontextModes from a visual.
 282  */
 283 static void
 284 st_visual_to_context_mode(const struct st_visual *visual,
 285                           __GLcontextModes *mode)
 286 {
 287    memset(mode, 0, sizeof(*mode));
 288
 289    if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
 290       mode->doubleBufferMode = GL_TRUE;
 291    if (st_visual_have_buffers(visual,
 292             ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
 293       mode->stereoMode = GL_TRUE;
 294
 295    if (visual->color_format != PIPE_FORMAT_NONE) {
 296       mode->rgbMode = GL_TRUE;
 297
 298       mode->redBits =
 299          util_format_get_component_bits(visual->color_format,
 300                UTIL_FORMAT_COLORSPACE_RGB, 0);
 301       mode->greenBits =
 302          util_format_get_component_bits(visual->color_format,
 303                UTIL_FORMAT_COLORSPACE_RGB, 1);
 304       mode->blueBits =
 305          util_format_get_component_bits(visual->color_format,
 306                UTIL_FORMAT_COLORSPACE_RGB, 2);
 307       mode->alphaBits =
 308          util_format_get_component_bits(visual->color_format,
 309                UTIL_FORMAT_COLORSPACE_RGB, 3);
 310
 311       mode->rgbBits = mode->redBits +
 312          mode->greenBits + mode->blueBits + mode->alphaBits;
 313    }
 314
 315    if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
 316       mode->haveDepthBuffer = GL_TRUE;
 317       mode->haveStencilBuffer = GL_TRUE;
 318
 319       mode->depthBits =
 320          util_format_get_component_bits(visual->depth_stencil_format,
 321                UTIL_FORMAT_COLORSPACE_ZS, 0);
 322       mode->stencilBits =
 323          util_format_get_component_bits(visual->depth_stencil_format,
 324                UTIL_FORMAT_COLORSPACE_ZS, 1);
 325    }
 326
 327    if (visual->accum_format != PIPE_FORMAT_NONE) {
 328       mode->haveAccumBuffer = GL_TRUE;
 329
 330       mode->accumRedBits =
 331          util_format_get_component_bits(visual->accum_format,
 332                UTIL_FORMAT_COLORSPACE_RGB, 0);
 333       mode->accumGreenBits =
 334          util_format_get_component_bits(visual->accum_format,
 335                UTIL_FORMAT_COLORSPACE_RGB, 1);
 336       mode->accumBlueBits =
 337          util_format_get_component_bits(visual->accum_format,
 338                UTIL_FORMAT_COLORSPACE_RGB, 2);
 339       mode->accumAlphaBits =
 340          util_format_get_component_bits(visual->accum_format,
 341                UTIL_FORMAT_COLORSPACE_RGB, 3);
 342    }
 343
 344    if (visual->samples) {
 345       mode->sampleBuffers = 1;
 346       mode->samples = visual->samples;
 347    }
 348 }
 349
 350 /**
 351  * Determine the default draw or read buffer from a visual.
 352  */
 353 static void
 354 st_visual_to_default_buffer(const struct st_visual *visual,
 355                             GLenum *buffer, GLint *index)
 356 {
 357    enum st_attachment_type statt;
 358    GLenum buf;
 359    gl_buffer_index idx;
 360
 361    statt = visual->render_buffer;
 362    /* do nothing if an invalid render buffer is specified */
 363    if (statt == ST_ATTACHMENT_INVALID ||
 364        !st_visual_have_buffers(visual, 1 << statt))
 365       return;
 366
 367    switch (statt) {
 368    case ST_ATTACHMENT_FRONT_LEFT:
 369       buf = GL_FRONT_LEFT;
 370       idx = BUFFER_FRONT_LEFT;
 371       break;
 372    case ST_ATTACHMENT_BACK_LEFT:
 373       buf = GL_BACK_LEFT;
 374       idx = BUFFER_BACK_LEFT;
 375       break;
 376    case ST_ATTACHMENT_FRONT_RIGHT:
 377       buf = GL_FRONT_RIGHT;
 378       idx = BUFFER_FRONT_RIGHT;
 379       break;
 380    case ST_ATTACHMENT_BACK_RIGHT:
 381       buf = GL_BACK_RIGHT;
 382       idx = BUFFER_BACK_RIGHT;
 383       break;
 384    default:
 385       buf = GL_NONE;
 386       idx = BUFFER_COUNT;
 387       break;
 388    }
 389
 390    if (buf != GL_NONE) {
 391       if (buffer)
 392          *buffer = buf;
 393       if (index)
 394          *index = idx;
 395    }
 396 }
 397
 398 /**
 399  * Create a framebuffer from a manager interface.
 400  */
 401 static struct st_framebuffer *
 402 st_framebuffer_create(struct st_framebuffer_iface *stfbi)
 403 {
 404    struct st_framebuffer *stfb;
 405    __GLcontextModes mode;
 406    gl_buffer_index idx;
 407
 408    stfb = CALLOC_STRUCT(st_framebuffer);
 409    if (!stfb)
 410       return NULL;
 411
 412    st_visual_to_context_mode(stfbi->visual, &mode);
 413    _mesa_initialize_window_framebuffer(&stfb->Base, &mode);
 414
 415    /* modify the draw/read buffers of the fb */
 416    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
 417          &stfb->Base._ColorDrawBufferIndexes[0]);
 418    st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
 419          &stfb->Base._ColorReadBufferIndex);
 420
 421    stfb->iface = stfbi;
 422
 423    /* add the color buffer */
 424    idx = stfb->Base._ColorDrawBufferIndexes[0];
 425    if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
 426       FREE(stfb);
 427       return NULL;
 428    }
 429
 430    st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
 431    st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);
 432
 433    st_framebuffer_update_attachments(stfb);
 434
 435    p_atomic_set(&stfb->revalidate, TRUE);
 436    stfb->Base.Initialized = GL_TRUE;
 437
 438    return stfb;
 439 }
 440
 441 /**
 442  * Reference a framebuffer.
 443  */
 444 static void
 445 st_framebuffer_reference(struct st_framebuffer **ptr,
 446                          struct st_framebuffer *stfb)
 447 {
 448    GLframebuffer *fb = &stfb->Base;
 449    _mesa_reference_framebuffer((GLframebuffer **) ptr, fb);
 450 }
 451
 452 static void
 453 st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
 454                                       struct st_framebuffer_iface *stfbi)
 455 {
 456    struct st_context *st = (struct st_context *) stctxi;
 457    struct st_framebuffer *stfb;
 458
 459    /* either draw or read winsys fb */
 460    stfb = (struct st_framebuffer *) st->ctx->WinSysDrawBuffer;
 461    if (!stfb || stfb->iface != stfbi)
 462       stfb = (struct st_framebuffer *) st->ctx->WinSysReadBuffer;
 463    assert(stfb && stfb->iface == stfbi);
 464
 465    p_atomic_set(&stfb->revalidate, TRUE);
 466 }
 467
 468 static void
 469 st_context_flush(struct st_context_iface *stctxi, unsigned flags,
 470                  struct pipe_fence_handle **fence)
 471 {
 472    struct st_context *st = (struct st_context *) stctxi;
 473    st_flush(st, flags, fence);
 474    if (flags & PIPE_FLUSH_RENDER_CACHE)
 475       st_manager_flush_frontbuffer(st);
 476 }
 477
 478 static boolean
 479 st_context_teximage(struct st_context_iface *stctxi, enum st_texture_type target,
 480                     int level, enum pipe_format internal_format,
 481                     struct pipe_texture *tex, boolean mipmap)
 482 {
 483    struct st_context *st = (struct st_context *) stctxi;
 484    GLcontext *ctx = st->ctx;
 485    struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
 486    struct gl_texture_object *texObj;
 487    struct gl_texture_image *texImage;
 488    struct st_texture_object *stObj;
 489    struct st_texture_image *stImage;
 490    GLenum internalFormat;
 491
 492    switch (target) {
 493    case ST_TEXTURE_1D:
 494       target = GL_TEXTURE_1D;
 495       break;
 496    case ST_TEXTURE_2D:
 497       target = GL_TEXTURE_2D;
 498       break;
 499    case ST_TEXTURE_3D:
 500       target = GL_TEXTURE_3D;
 501       break;
 502    case ST_TEXTURE_RECT:
 503       target = GL_TEXTURE_RECTANGLE_ARB;
 504       break;
 505    default:
 506       return FALSE;
 507       break;
 508    }
 509
 510    if (util_format_get_component_bits(internal_format,
 511             UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
 512       internalFormat = GL_RGBA;
 513    else
 514       internalFormat = GL_RGB;
 515
 516    texObj = _mesa_select_tex_object(ctx, texUnit, target);
 517    _mesa_lock_texture(ctx, texObj);
 518
 519    stObj = st_texture_object(texObj);
 520    /* switch to surface based */
 521    if (!stObj->surface_based) {
 522       _mesa_clear_texture_object(ctx, texObj);
 523       stObj->surface_based = GL_TRUE;
 524    }
 525
 526    texImage = _mesa_get_tex_image(ctx, texObj, target, level);
 527    stImage = st_texture_image(texImage);
 528    if (tex) {
 529       _mesa_init_teximage_fields(ctx, target, texImage,
 530             tex->width0, tex->height0, 1, 0, internalFormat);
 531       texImage->TexFormat = st_ChooseTextureFormat(ctx, internalFormat,
 532             GL_RGBA, GL_UNSIGNED_BYTE);
 533       _mesa_set_fetch_functions(texImage, 2);
 534    }
 535    else {
 536       _mesa_clear_texture_image(ctx, texImage);
 537    }
 538
 539    pipe_texture_reference(&stImage->pt, tex);
 540
 541    _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
 542    _mesa_unlock_texture(ctx, texObj);
 543
 544    return TRUE;
 545 }
 546
 547 static void
 548 st_context_destroy(struct st_context_iface *stctxi)
 549 {
 550    struct st_context *st = (struct st_context *) stctxi;
 551    st_destroy_context(st);
 552 }
 553
 554 static struct st_context_iface *
 555 st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
 556                       const struct st_visual *visual,
 557                       struct st_context_iface *shared_stctxi)
 558 {
 559    struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
 560    struct st_context *st;
 561    struct pipe_context *pipe;
 562    __GLcontextModes mode;
 563
 564    pipe = smapi->screen->context_create(smapi->screen, NULL);
 565    if (!pipe)
 566       return NULL;
 567
 568    st_visual_to_context_mode(visual, &mode);
 569    st = st_create_context(pipe, &mode, shared_ctx);
 570    if (!st) {
 571       pipe->destroy(pipe);
 572       return NULL;
 573    }
 574
 575    st->iface.destroy = st_context_destroy;
 576
 577    st->iface.notify_invalid_framebuffer =
 578       st_context_notify_invalid_framebuffer;
 579    st->iface.flush = st_context_flush;
 580
 581    st->iface.teximage = st_context_teximage;
 582    st->iface.copy = NULL;
 583
 584    st->iface.st_context_private = (void *) smapi;
 585
 586    return &st->iface;
 587 }
 588
 589 static boolean
 590 st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
 591                     struct st_framebuffer_iface *stdrawi,
 592                     struct st_framebuffer_iface *streadi)
 593 {
 594    struct st_context *st = (struct st_context *) stctxi;
 595    struct st_framebuffer *stdraw, *stread, *stfb;
 596    boolean ret;
 597
 598    _glapi_check_multithread();
 599
 600    if (st) {
 601       /* reuse/create the draw fb */
 602       stfb = (struct st_framebuffer * ) st->ctx->DrawBuffer;
 603       if (stfb && stfb->iface == stdrawi) {
 604          stdraw = NULL;
 605          st_framebuffer_reference(&stdraw, stfb);
 606       }
 607       else {
 608          stdraw = st_framebuffer_create(stdrawi);
 609       }
 610
 611       /* reuse/create the read fb */
 612       stfb = (struct st_framebuffer * ) st->ctx->ReadBuffer;
 613       if (!stfb || stfb->iface != streadi)
 614          stfb = stdraw;
 615       if (stfb && stfb->iface == streadi) {
 616          stread = NULL;
 617          st_framebuffer_reference(&stread, stfb);
 618       }
 619       else {
 620          stread = st_framebuffer_create(streadi);
 621       }
 622
 623       if (stdraw && stread) {
 624          st_framebuffer_validate(stdraw, st);
 625          if (stread != stdraw)
 626             st_framebuffer_validate(stread, st);
 627
 628          /* modify the draw/read buffers of the context */
 629          st_visual_to_default_buffer(stdraw->iface->visual,
 630                &st->ctx->Color.DrawBuffer[0], NULL);
 631          st_visual_to_default_buffer(stread->iface->visual,
 632                &st->ctx->Pixel.ReadBuffer, NULL);
 633
 634          ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
 635       }
 636       else {
 637          ret = FALSE;
 638       }
 639
 640       st_framebuffer_reference(&stdraw, NULL);
 641       st_framebuffer_reference(&stread, NULL);
 642    }
 643    else {
 644       ret = _mesa_make_current(NULL, NULL, NULL);
 645    }
 646
 647    return ret;
 648 }
 649
 650 static struct st_context_iface *
 651 st_api_get_current(struct st_api *stapi)
 652 {
 653    GET_CURRENT_CONTEXT(ctx);
 654    struct st_context *st = (ctx) ? ctx->st : NULL;
 655
 656    return (st) ? &st->iface : NULL;
 657 }
 658
 659 static boolean
 660 st_api_is_visual_supported(struct st_api *stapi,
 661                            const struct st_visual *visual)
 662 {
 663    return TRUE;
 664 }
 665
 666 static st_proc_t
 667 st_api_get_proc_address(struct st_api *stapi, const char *procname)
 668 {
 669    return (st_proc_t) _glapi_get_proc_address(procname);
 670 }
 671
 672 static void
 673 st_api_destroy(struct st_api *stapi)
 674 {
 675    FREE(stapi);
 676 }
 677
 678 /**
 679  * Flush the front buffer if the current context renders to the front buffer.
 680  */
 681 void
 682 st_manager_flush_frontbuffer(struct st_context *st)
 683 {
 684    struct st_framebuffer *stfb = (struct st_framebuffer *) st->ctx->DrawBuffer;
 685    struct st_renderbuffer *strb = NULL;
 686
 687    if (stfb)
 688       strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
 689    if (!strb)
 690       return;
 691
 692    /* st_public.h or FBO */
 693    if (!stfb->iface) {
 694       struct pipe_surface *front_surf = strb->surface;
 695       st->pipe->screen->flush_frontbuffer(st->pipe->screen,
 696             front_surf, st->winsys_drawable_handle);
 697       return;
 698    }
 699
 700    stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
 701 }
 702
 703 /**
 704  * Re-validate the framebuffer.
 705  */
 706 void
 707 st_manager_validate_framebuffers(struct st_context *st)
 708 {
 709    struct st_framebuffer *stdraw, *stread;
 710
 711    stdraw = (struct st_framebuffer *) st->ctx->DrawBuffer;
 712    stread = (struct st_framebuffer *) st->ctx->ReadBuffer;
 713
 714    /* st_public.h or FBO */
 715    if ((stdraw && !stdraw->iface) || (stread && !stread->iface)) {
 716       struct pipe_screen *screen = st->pipe->screen;
 717       if (screen->update_buffer)
 718          screen->update_buffer(screen, st->pipe->priv);
 719       return;
 720    }
 721
 722    if (stdraw)
 723       st_framebuffer_validate(stdraw, st);
 724    if (stread && stread != stdraw)
 725       st_framebuffer_validate(stread, st);
 726 }
 727
 728 /**
 729  * Add a color buffer on demand.
 730  */
 731 boolean
 732 st_manager_add_color_renderbuffer(struct st_context *st, GLframebuffer *fb,
 733                                   gl_buffer_index idx)
 734 {
 735    struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
 736
 737    if (stfb->Base.Attachment[idx].Renderbuffer)
 738       return TRUE;
 739
 740    /* st_public.h or FBO */
 741    if (!stfb->iface)
 742       return FALSE;
 743
 744    switch (idx) {
 745    case BUFFER_FRONT_LEFT:
 746    case BUFFER_BACK_LEFT:
 747    case BUFFER_FRONT_RIGHT:
 748    case BUFFER_BACK_RIGHT:
 749       break;
 750    default:
 751       return FALSE;
 752       break;
 753    }
 754
 755    if (!st_framebuffer_add_renderbuffer(stfb, idx))
 756       return FALSE;
 757
 758    st_framebuffer_update_attachments(stfb);
 759    st_invalidate_state(st->ctx, _NEW_BUFFERS);
 760
 761    return TRUE;
 762 }
 763
 764 struct st_api *
 765 st_manager_create_api(void)
 766 {
 767    struct st_api *stapi;
 768
 769    stapi = CALLOC_STRUCT(st_api);
 770    if (stapi) {
 771       stapi->destroy = st_api_destroy;
 772       stapi->get_proc_address = st_api_get_proc_address;
 773       stapi->is_visual_supported = st_api_is_visual_supported;
 774
 775       stapi->create_context = st_api_create_context;
 776       stapi->make_current = st_api_make_current;
 777       stapi->get_current = st_api_get_current;
 778    }
 779
 780    return stapi;
 781 }