src/gallium/state_trackers/dri/dri_drawable.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009, VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27 /*
  28  * Author: Keith Whitwell <keithw@vmware.com>
  29  * Author: Jakob Bornecrantz <wallbraker@gmail.com>
  30  */
  31
  32 #include "dri_screen.h"
  33 #include "dri_context.h"
  34 #include "dri_drawable.h"
  35
  36 #include "pipe/p_context.h"
  37 #include "pipe/p_screen.h"
  38 #include "pipe/p_inlines.h"
  39 #include "state_tracker/drm_api.h"
  40 #include "state_tracker/dri1_api.h"
  41 #include "state_tracker/st_public.h"
  42 #include "state_tracker/st_context.h"
  43 #include "state_tracker/st_cb_fbo.h"
  44
  45 #include "util/u_memory.h"
  46
  47 static struct pipe_surface *
  48 dri_surface_from_handle(struct drm_api *api,
  49                         struct pipe_screen *screen,
  50                         unsigned handle,
  51                         enum pipe_format format,
  52                         unsigned width, unsigned height, unsigned pitch)
  53 {
  54    struct pipe_surface *surface = NULL;
  55    struct pipe_texture *texture = NULL;
  56    struct pipe_texture templat;
  57    struct pipe_buffer *buf = NULL;
  58
  59    buf = api->buffer_from_handle(api, screen, "dri2 buffer", handle);
  60    if (!buf)
  61       return NULL;
  62
  63    memset(&templat, 0, sizeof(templat));
  64    templat.tex_usage |= PIPE_TEXTURE_USAGE_RENDER_TARGET;
  65    templat.target = PIPE_TEXTURE_2D;
  66    templat.last_level = 0;
  67    templat.depth[0] = 1;
  68    templat.format = format;
  69    templat.width[0] = width;
  70    templat.height[0] = height;
  71    pf_get_block(templat.format, &templat.block);
  72
  73    texture = screen->texture_blanket(screen, &templat, &pitch, buf);
  74
  75    /* we don't need the buffer from this point on */
  76    pipe_buffer_reference(&buf, NULL);
  77
  78    if (!texture)
  79       return NULL;
  80
  81    surface = screen->get_tex_surface(screen, texture, 0, 0, 0,
  82                                      PIPE_BUFFER_USAGE_GPU_READ |
  83                                      PIPE_BUFFER_USAGE_GPU_WRITE);
  84
  85    /* we don't need the texture from this point on */
  86    pipe_texture_reference(&texture, NULL);
  87    return surface;
  88 }
  89
  90 /**
  91  * This will be called a drawable is known to have been resized.
  92  */
  93 void
  94 dri_get_buffers(__DRIdrawablePrivate * dPriv)
  95 {
  96
  97    struct dri_drawable *drawable = dri_drawable(dPriv);
  98    struct pipe_surface *surface = NULL;
  99    struct pipe_screen *screen = dri_screen(drawable->sPriv)->pipe_screen;
 100    __DRIbuffer *buffers = NULL;
 101    __DRIscreen *dri_screen = drawable->sPriv;
 102    __DRIdrawable *dri_drawable = drawable->dPriv;
 103    struct drm_api *api = ((struct dri_screen*)(dri_screen->private))->api;
 104    boolean have_depth = FALSE;
 105    int i, count;
 106
 107    buffers = (*dri_screen->dri2.loader->getBuffers) (dri_drawable,
 108                                                      &dri_drawable->w,
 109                                                      &dri_drawable->h,
 110                                                      drawable->attachments,
 111                                                      drawable->
 112                                                      num_attachments, &count,
 113                                                      dri_drawable->
 114                                                      loaderPrivate);
 115
 116    if (buffers == NULL) {
 117       return;
 118    }
 119
 120    /* set one cliprect to cover the whole dri_drawable */
 121    dri_drawable->x = 0;
 122    dri_drawable->y = 0;
 123    dri_drawable->backX = 0;
 124    dri_drawable->backY = 0;
 125    dri_drawable->numClipRects = 1;
 126    dri_drawable->pClipRects[0].x1 = 0;
 127    dri_drawable->pClipRects[0].y1 = 0;
 128    dri_drawable->pClipRects[0].x2 = dri_drawable->w;
 129    dri_drawable->pClipRects[0].y2 = dri_drawable->h;
 130    dri_drawable->numBackClipRects = 1;
 131    dri_drawable->pBackClipRects[0].x1 = 0;
 132    dri_drawable->pBackClipRects[0].y1 = 0;
 133    dri_drawable->pBackClipRects[0].x2 = dri_drawable->w;
 134    dri_drawable->pBackClipRects[0].y2 = dri_drawable->h;
 135
 136    if (drawable->old_num == count &&
 137        drawable->old_w == dri_drawable->w &&
 138        drawable->old_h == dri_drawable->h &&
 139        memcmp(drawable->old, buffers, sizeof(__DRIbuffer) * count) == 0) {
 140        return;
 141    } else {
 142       drawable->old_num = count;
 143       drawable->old_w = dri_drawable->w;
 144       drawable->old_h = dri_drawable->h;
 145       memcpy(drawable->old, buffers, sizeof(__DRIbuffer) * count);
 146    }
 147
 148    for (i = 0; i < count; i++) {
 149       enum pipe_format format = 0;
 150       int index = 0;
 151
 152       switch (buffers[i].attachment) {
 153       case __DRI_BUFFER_FRONT_LEFT:
 154          continue;
 155       case __DRI_BUFFER_FAKE_FRONT_LEFT:
 156          index = ST_SURFACE_FRONT_LEFT;
 157          format = drawable->color_format;
 158          break;
 159       case __DRI_BUFFER_BACK_LEFT:
 160          index = ST_SURFACE_BACK_LEFT;
 161          format = drawable->color_format;
 162          break;
 163       case __DRI_BUFFER_DEPTH:
 164          index = ST_SURFACE_DEPTH;
 165          format = drawable->depth_format;
 166          break;
 167       case __DRI_BUFFER_STENCIL:
 168          index = ST_SURFACE_DEPTH;
 169          format = drawable->stencil_format;
 170          break;
 171       case __DRI_BUFFER_ACCUM:
 172       default:
 173          assert(0);
 174       }
 175
 176       if (index == ST_SURFACE_DEPTH) {
 177          if (have_depth)
 178             continue;
 179          else
 180             have_depth = TRUE;
 181       }
 182
 183       surface = dri_surface_from_handle(api,
 184                                         screen,
 185                                         buffers[i].name,
 186                                         format,
 187                                         dri_drawable->w,
 188                                         dri_drawable->h, buffers[i].pitch);
 189
 190       st_set_framebuffer_surface(drawable->stfb, index, surface);
 191       pipe_surface_reference(&surface, NULL);
 192    }
 193    /* this needed, or else the state tracker fails to pick the new buffers */
 194    st_resize_framebuffer(drawable->stfb, dri_drawable->w, dri_drawable->h);
 195 }
 196
 197 /**
 198  * These are used for GLX_EXT_texture_from_pixmap
 199  */
 200 void dri2_set_tex_buffer2(__DRIcontext *pDRICtx, GLint target,
 201                           GLint format, __DRIdrawable *dPriv)
 202 {
 203    struct dri_drawable *drawable = dri_drawable(dPriv);
 204    struct pipe_surface *ps;
 205
 206    dri_get_buffers(drawable->dPriv);
 207    st_get_framebuffer_surface(drawable->stfb, ST_SURFACE_FRONT_LEFT, &ps);
 208
 209    st_bind_texture_surface(ps, target == GL_TEXTURE_2D ? ST_TEXTURE_2D :
 210                            ST_TEXTURE_RECT, 0,
 211                            format == GLX_TEXTURE_FORMAT_RGBA_EXT ?
 212                            PIPE_FORMAT_R8G8B8A8_UNORM : PIPE_FORMAT_R8G8B8X8_UNORM);
 213 }
 214
 215 void dri2_set_tex_buffer(__DRIcontext *pDRICtx, GLint target,
 216                          __DRIdrawable *dPriv)
 217 {
 218    dri2_set_tex_buffer2(pDRICtx, target, GLX_TEXTURE_FORMAT_RGBA_EXT, dPriv);
 219 }
 220
 221 void
 222 dri_flush_frontbuffer(struct pipe_screen *screen,
 223                       struct pipe_surface *surf, void *context_private)
 224 {
 225    struct dri_context *ctx = (struct dri_context *)context_private;
 226    struct dri_drawable *drawable = dri_drawable(ctx->dPriv);
 227    __DRIdrawable *dri_drawable = ctx->dPriv;
 228    __DRIscreen *dri_screen = ctx->sPriv;
 229
 230    /* XXX Does this function get called with DRI1? */
 231
 232    if (ctx->dPriv == NULL) {
 233       debug_printf("%s: no drawable bound to context\n", __func__);
 234       return;
 235    }
 236
 237    (*dri_screen->dri2.loader->flushFrontBuffer)(dri_drawable,
 238                                                 dri_drawable->loaderPrivate);
 239 }
 240
 241 /**
 242  * This is called when we need to set up GL rendering to a new X window.
 243  */
 244 boolean
 245 dri_create_buffer(__DRIscreenPrivate * sPriv,
 246                   __DRIdrawablePrivate * dPriv,
 247                   const __GLcontextModes * visual, boolean isPixmap)
 248 {
 249    struct dri_screen *screen = sPriv->private;
 250    struct dri_drawable *drawable = NULL;
 251    int i;
 252
 253    if (isPixmap)
 254       goto fail;                       /* not implemented */
 255
 256    drawable = CALLOC_STRUCT(dri_drawable);
 257    if (drawable == NULL)
 258       goto fail;
 259
 260    drawable->color_format = (visual->redBits == 8) ?
 261       PIPE_FORMAT_A8R8G8B8_UNORM : PIPE_FORMAT_R5G6B5_UNORM;
 262
 263    debug_printf("Red bits is %d\n", visual->redBits);
 264
 265    switch(visual->depthBits) {
 266    default:
 267    case 0:
 268       debug_printf("Depth buffer 0.\n");
 269       drawable->depth_format = PIPE_FORMAT_NONE;
 270       break;
 271    case 16:
 272       debug_printf("Depth buffer 16.\n");
 273       drawable->depth_format = PIPE_FORMAT_Z16_UNORM;
 274       break;
 275    case 24:
 276       if (visual->stencilBits == 0) {
 277          debug_printf("Depth buffer 24. Stencil 0.\n");
 278          drawable->depth_format = (screen->d_depth_bits_last) ?
 279             PIPE_FORMAT_X8Z24_UNORM:
 280             PIPE_FORMAT_Z24X8_UNORM;
 281       } else {
 282          debug_printf("Combined depth stencil 24 / 8.\n");
 283          drawable->depth_format = (screen->sd_depth_bits_last) ?
 284             PIPE_FORMAT_S8Z24_UNORM:
 285             PIPE_FORMAT_Z24S8_UNORM;
 286       }
 287       break;
 288    }
 289
 290    switch(visual->stencilBits) {
 291    default:
 292    case 0:
 293       drawable->stencil_format = PIPE_FORMAT_NONE;
 294       break;
 295    case 8:
 296       drawable->stencil_format = (screen->sd_depth_bits_last) ?
 297          PIPE_FORMAT_S8Z24_UNORM:
 298          PIPE_FORMAT_Z24S8_UNORM;
 299       break;
 300    }
 301
 302    drawable->stfb = st_create_framebuffer(visual,
 303                                           drawable->color_format,
 304                                           drawable->depth_format,
 305                                           drawable->stencil_format,
 306                                           dPriv->w,
 307                                           dPriv->h, (void *)drawable);
 308    if (drawable->stfb == NULL)
 309       goto fail;
 310
 311    drawable->sPriv = sPriv;
 312    drawable->dPriv = dPriv;
 313    dPriv->driverPrivate = (void *)drawable;
 314
 315    /* setup dri2 buffers information */
 316    /* TODO incase of double buffer visual, delay fake creation */
 317    i = 0;
 318    drawable->attachments[i++] = __DRI_BUFFER_FRONT_LEFT;
 319    drawable->attachments[i++] = __DRI_BUFFER_FAKE_FRONT_LEFT;
 320
 321    if (visual->doubleBufferMode)
 322       drawable->attachments[i++] = __DRI_BUFFER_BACK_LEFT;
 323    if (visual->depthBits)
 324       drawable->attachments[i++] = __DRI_BUFFER_DEPTH;
 325    if (visual->stencilBits)
 326       drawable->attachments[i++] = __DRI_BUFFER_STENCIL;
 327    drawable->num_attachments = i;
 328
 329    drawable->desired_fences = 2;
 330
 331    return GL_TRUE;
 332  fail:
 333    FREE(drawable);
 334    return GL_FALSE;
 335 }
 336
 337 static struct pipe_fence_handle *
 338 dri_swap_fences_pop_front(struct dri_drawable *draw)
 339 {
 340    struct pipe_screen *screen = dri_screen(draw->sPriv)->pipe_screen;
 341    struct pipe_fence_handle *fence = NULL;
 342
 343    if (draw->cur_fences >= draw->desired_fences) {
 344       screen->fence_reference(screen, &fence, draw->swap_fences[draw->tail]);
 345       screen->fence_reference(screen, &draw->swap_fences[draw->tail++], NULL);
 346       --draw->cur_fences;
 347       draw->tail &= DRI_SWAP_FENCES_MASK;
 348    }
 349    return fence;
 350 }
 351
 352 static void
 353 dri_swap_fences_push_back(struct dri_drawable *draw,
 354                           struct pipe_fence_handle *fence)
 355 {
 356    struct pipe_screen *screen = dri_screen(draw->sPriv)->pipe_screen;
 357
 358    if (!fence)
 359       return;
 360
 361    if (draw->cur_fences < DRI_SWAP_FENCES_MAX) {
 362       draw->cur_fences++;
 363       screen->fence_reference(screen, &draw->swap_fences[draw->head++],
 364                               fence);
 365       draw->head &= DRI_SWAP_FENCES_MASK;
 366    }
 367 }
 368
 369 void
 370 dri_destroy_buffer(__DRIdrawablePrivate * dPriv)
 371 {
 372    struct dri_drawable *drawable = dri_drawable(dPriv);
 373    struct pipe_fence_handle *fence;
 374    struct pipe_screen *screen = dri_screen(drawable->sPriv)->pipe_screen;
 375
 376    st_unreference_framebuffer(drawable->stfb);
 377    drawable->desired_fences = 0;
 378    while (drawable->cur_fences) {
 379       fence = dri_swap_fences_pop_front(drawable);
 380       screen->fence_reference(screen, &fence, NULL);
 381    }
 382
 383    FREE(drawable);
 384 }
 385
 386 static void
 387 dri1_update_drawables_locked(struct dri_context *ctx,
 388                              __DRIdrawablePrivate * driDrawPriv,
 389                              __DRIdrawablePrivate * driReadPriv)
 390 {
 391    if (ctx->stLostLock) {
 392       ctx->stLostLock = FALSE;
 393       if (driDrawPriv == driReadPriv)
 394          DRI_VALIDATE_DRAWABLE_INFO(ctx->sPriv, driDrawPriv);
 395       else
 396          DRI_VALIDATE_TWO_DRAWABLES_INFO(ctx->sPriv, driDrawPriv,
 397                                          driReadPriv);
 398    }
 399 }
 400
 401 /**
 402  * This ensures all contexts which bind to a drawable pick up the
 403  * drawable change and signal new buffer state.
 404  * Calling st_resize_framebuffer for each context may seem like overkill,
 405  * but no new buffers will actually be allocated if the dimensions don't
 406  * change.
 407  */
 408
 409 static void
 410 dri1_propagate_drawable_change(struct dri_context *ctx)
 411 {
 412    __DRIdrawablePrivate *dPriv = ctx->dPriv;
 413    __DRIdrawablePrivate *rPriv = ctx->rPriv;
 414    boolean flushed = FALSE;
 415
 416    if (dPriv && ctx->d_stamp != dPriv->lastStamp) {
 417
 418       st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 419       flushed = TRUE;
 420       ctx->d_stamp = dPriv->lastStamp;
 421       st_resize_framebuffer(dri_drawable(dPriv)->stfb, dPriv->w, dPriv->h);
 422
 423    }
 424
 425    if (rPriv && dPriv != rPriv && ctx->r_stamp != rPriv->lastStamp) {
 426
 427       if (!flushed)
 428          st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 429       ctx->r_stamp = rPriv->lastStamp;
 430       st_resize_framebuffer(dri_drawable(rPriv)->stfb, rPriv->w, rPriv->h);
 431
 432    } else if (rPriv && dPriv == rPriv) {
 433
 434       ctx->r_stamp = ctx->d_stamp;
 435
 436    }
 437 }
 438
 439 void
 440 dri1_update_drawables(struct dri_context *ctx,
 441                       struct dri_drawable *draw, struct dri_drawable *read)
 442 {
 443    dri_lock(ctx);
 444    dri1_update_drawables_locked(ctx, draw->dPriv, read->dPriv);
 445    dri_unlock(ctx);
 446
 447    dri1_propagate_drawable_change(ctx);
 448 }
 449
 450 static INLINE boolean
 451 dri1_intersect_src_bbox(struct drm_clip_rect *dst,
 452                         int dst_x,
 453                         int dst_y,
 454                         const struct drm_clip_rect *src,
 455                         const struct drm_clip_rect *bbox)
 456 {
 457    int xy1;
 458    int xy2;
 459
 460    xy1 = ((int)src->x1 > (int)bbox->x1 + dst_x) ? src->x1 :
 461       (int)bbox->x1 + dst_x;
 462    xy2 = ((int)src->x2 < (int)bbox->x2 + dst_x) ? src->x2 :
 463       (int)bbox->x2 + dst_x;
 464    if (xy1 >= xy2 || xy1 < 0)
 465       return FALSE;
 466
 467    dst->x1 = xy1;
 468    dst->x2 = xy2;
 469
 470    xy1 = ((int)src->y1 > (int)bbox->y1 + dst_y) ? src->y1 :
 471       (int)bbox->y1 + dst_y;
 472    xy2 = ((int)src->y2 < (int)bbox->y2 + dst_y) ? src->y2 :
 473       (int)bbox->y2 + dst_y;
 474    if (xy1 >= xy2 || xy1 < 0)
 475       return FALSE;
 476
 477    dst->y1 = xy1;
 478    dst->y2 = xy2;
 479    return TRUE;
 480 }
 481
 482 static void
 483 dri1_swap_copy(struct dri_context *ctx,
 484                struct pipe_surface *dst,
 485                struct pipe_surface *src,
 486                __DRIdrawablePrivate * dPriv, const struct drm_clip_rect *bbox)
 487 {
 488    struct pipe_context *pipe = ctx->pipe;
 489    struct drm_clip_rect clip;
 490    struct drm_clip_rect *cur;
 491    int i;
 492
 493    cur = dPriv->pClipRects;
 494
 495    for (i = 0; i < dPriv->numClipRects; ++i) {
 496       if (dri1_intersect_src_bbox(&clip, dPriv->x, dPriv->y, cur++, bbox))
 497          pipe->surface_copy(pipe, dst, clip.x1, clip.y1,
 498                             src,
 499                             (int)clip.x1 - dPriv->x,
 500                             (int)clip.y1 - dPriv->y,
 501                             clip.x2 - clip.x1, clip.y2 - clip.y1);
 502    }
 503 }
 504
 505 static void
 506 dri1_copy_to_front(struct dri_context *ctx,
 507                    struct pipe_surface *surf,
 508                    __DRIdrawablePrivate * dPriv,
 509                    const struct drm_clip_rect *sub_box,
 510                    struct pipe_fence_handle **fence)
 511 {
 512    struct pipe_context *pipe = ctx->pipe;
 513    boolean save_lost_lock;
 514    uint cur_w;
 515    uint cur_h;
 516    struct drm_clip_rect bbox;
 517    boolean visible = TRUE;
 518
 519    *fence = NULL;
 520
 521    dri_lock(ctx);
 522    save_lost_lock = ctx->stLostLock;
 523    dri1_update_drawables_locked(ctx, dPriv, dPriv);
 524    st_get_framebuffer_dimensions(dri_drawable(dPriv)->stfb, &cur_w, &cur_h);
 525
 526    bbox.x1 = 0;
 527    bbox.x2 = cur_w;
 528    bbox.y1 = 0;
 529    bbox.y2 = cur_h;
 530
 531    if (sub_box)
 532       visible = dri1_intersect_src_bbox(&bbox, 0, 0, &bbox, sub_box);
 533
 534    if (visible && __dri1_api_hooks->present_locked) {
 535
 536       __dri1_api_hooks->present_locked(pipe,
 537                                        surf,
 538                                        dPriv->pClipRects,
 539                                        dPriv->numClipRects,
 540                                        dPriv->x, dPriv->y, &bbox, fence);
 541
 542    } else if (visible && __dri1_api_hooks->front_srf_locked) {
 543
 544       struct pipe_surface *front = __dri1_api_hooks->front_srf_locked(pipe);
 545
 546       if (front)
 547          dri1_swap_copy(ctx, front, surf, dPriv, &bbox);
 548
 549       st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, fence);
 550    }
 551
 552    ctx->stLostLock = save_lost_lock;
 553
 554    /**
 555     * FIXME: Revisit this: Update drawables on copy_sub_buffer ?
 556     */
 557
 558    if (!sub_box)
 559       dri1_update_drawables_locked(ctx, ctx->dPriv, ctx->rPriv);
 560
 561    dri_unlock(ctx);
 562    dri1_propagate_drawable_change(ctx);
 563 }
 564
 565 void
 566 dri1_flush_frontbuffer(struct pipe_screen *screen,
 567                        struct pipe_surface *surf, void *context_private)
 568 {
 569    struct dri_context *ctx = (struct dri_context *)context_private;
 570    struct pipe_fence_handle *dummy_fence;
 571
 572    dri1_copy_to_front(ctx, surf, ctx->dPriv, NULL, &dummy_fence);
 573    screen->fence_reference(screen, &dummy_fence, NULL);
 574
 575    /**
 576     * FIXME: Do we need swap throttling here?
 577     */
 578 }
 579
 580 void
 581 dri_swap_buffers(__DRIdrawablePrivate * dPriv)
 582 {
 583    struct dri_context *ctx;
 584    struct pipe_surface *back_surf;
 585    struct dri_drawable *draw = dri_drawable(dPriv);
 586    struct pipe_screen *screen = dri_screen(draw->sPriv)->pipe_screen;
 587    struct pipe_fence_handle *fence;
 588    struct st_context *st = st_get_current();
 589
 590    assert(__dri1_api_hooks != NULL);
 591
 592    if (!st)
 593       return;                          /* For now */
 594
 595    ctx = (struct dri_context *)st->pipe->priv;
 596
 597    st_get_framebuffer_surface(draw->stfb, ST_SURFACE_BACK_LEFT, &back_surf);
 598    if (back_surf) {
 599       st_notify_swapbuffers(draw->stfb);
 600       st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 601       fence = dri_swap_fences_pop_front(draw);
 602       if (fence) {
 603          (void)screen->fence_finish(screen, fence, 0);
 604          screen->fence_reference(screen, &fence, NULL);
 605       }
 606       dri1_copy_to_front(ctx, back_surf, dPriv, NULL, &fence);
 607       dri_swap_fences_push_back(draw, fence);
 608       screen->fence_reference(screen, &fence, NULL);
 609    }
 610 }
 611
 612 void
 613 dri_copy_sub_buffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h)
 614 {
 615    struct pipe_screen *screen = dri_screen(dPriv->driScreenPriv)->pipe_screen;
 616    struct drm_clip_rect sub_bbox;
 617    struct dri_context *ctx;
 618    struct pipe_surface *back_surf;
 619    struct dri_drawable *draw = dri_drawable(dPriv);
 620    struct pipe_fence_handle *dummy_fence;
 621    struct st_context *st = st_get_current();
 622
 623    assert(__dri1_api_hooks != NULL);
 624
 625    if (!st)
 626       return;
 627
 628    ctx = (struct dri_context *)st->pipe->priv;
 629
 630    sub_bbox.x1 = x;
 631    sub_bbox.x2 = x + w;
 632    sub_bbox.y1 = y;
 633    sub_bbox.y2 = y + h;
 634
 635    st_get_framebuffer_surface(draw->stfb, ST_SURFACE_BACK_LEFT, &back_surf);
 636    if (back_surf) {
 637       st_flush(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 638       dri1_copy_to_front(ctx, back_surf, dPriv, &sub_bbox, &dummy_fence);
 639       screen->fence_reference(screen, &dummy_fence, NULL);
 640    }
 641 }
 642
 643 /* vim: set sw=3 ts=8 sts=3 expandtab: */