src/mesa/drivers/dri/i915tex/intel_buffers.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   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 TUNGSTEN GRAPHICS 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 #include "intel_screen.h"
  29 #include "intel_context.h"
  30 #include "intel_blit.h"
  31 #include "intel_buffers.h"
  32 #include "intel_depthstencil.h"
  33 #include "intel_fbo.h"
  34 #include "intel_tris.h"
  35 #include "intel_regions.h"
  36 #include "intel_batchbuffer.h"
  37 #include "intel_reg.h"
  38 #include "context.h"
  39 #include "utils.h"
  40 #include "drirenderbuffer.h"
  41 #include "framebuffer.h"
  42 #include "swrast/swrast.h"
  43 #include "vblank.h"
  44
  45
  46 /* This block can be removed when libdrm >= 2.3.1 is required */
  47
  48 #ifndef DRM_VBLANK_FLIP
  49
  50 #define DRM_VBLANK_FLIP 0x8000000
  51
  52 typedef struct drm_i915_flip {
  53    int pipes;
  54 } drm_i915_flip_t;
  55
  56 #undef DRM_IOCTL_I915_FLIP
  57 #define DRM_IOCTL_I915_FLIP DRM_IOW(DRM_COMMAND_BASE + DRM_I915_FLIP, \
  58                                     drm_i915_flip_t)
  59
  60 #endif
  61
  62
  63 /**
  64  * XXX move this into a new dri/common/cliprects.c file.
  65  */
  66 GLboolean
  67 intel_intersect_cliprects(drm_clip_rect_t * dst,
  68                           const drm_clip_rect_t * a,
  69                           const drm_clip_rect_t * b)
  70 {
  71    GLint bx = b->x1;
  72    GLint by = b->y1;
  73    GLint bw = b->x2 - bx;
  74    GLint bh = b->y2 - by;
  75
  76    if (bx < a->x1)
  77       bw -= a->x1 - bx, bx = a->x1;
  78    if (by < a->y1)
  79       bh -= a->y1 - by, by = a->y1;
  80    if (bx + bw > a->x2)
  81       bw = a->x2 - bx;
  82    if (by + bh > a->y2)
  83       bh = a->y2 - by;
  84    if (bw <= 0)
  85       return GL_FALSE;
  86    if (bh <= 0)
  87       return GL_FALSE;
  88
  89    dst->x1 = bx;
  90    dst->y1 = by;
  91    dst->x2 = bx + bw;
  92    dst->y2 = by + bh;
  93
  94    return GL_TRUE;
  95 }
  96
  97 /**
  98  * Return pointer to current color drawing region, or NULL.
  99  */
 100 struct intel_region *
 101 intel_drawbuf_region(struct intel_context *intel)
 102 {
 103    struct intel_renderbuffer *irbColor =
 104       intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0][0]);
 105    if (irbColor)
 106       return irbColor->region;
 107    else
 108       return NULL;
 109 }
 110
 111 /**
 112  * Return pointer to current color reading region, or NULL.
 113  */
 114 struct intel_region *
 115 intel_readbuf_region(struct intel_context *intel)
 116 {
 117    struct intel_renderbuffer *irb
 118       = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
 119    if (irb)
 120       return irb->region;
 121    else
 122       return NULL;
 123 }
 124
 125
 126
 127 /**
 128  * Update the following fields for rendering:
 129  *   intel->numClipRects
 130  *   intel->pClipRects
 131  */
 132 static void
 133 intelSetRenderbufferClipRects(struct intel_context *intel)
 134 {
 135    /* zero-sized buffers might be legal? */
 136    assert(intel->ctx.DrawBuffer->Width > 0);
 137    assert(intel->ctx.DrawBuffer->Height > 0);
 138    intel->fboRect.x1 = 0;
 139    intel->fboRect.y1 = 0;
 140    intel->fboRect.x2 = intel->ctx.DrawBuffer->Width;
 141    intel->fboRect.y2 = intel->ctx.DrawBuffer->Height;
 142    intel->numClipRects = 1;
 143    intel->pClipRects = &intel->fboRect;
 144 }
 145
 146
 147 /**
 148  * This will be called whenever the currently bound window is moved/resized.
 149  * XXX: actually, it seems to NOT be called when the window is only moved (BP).
 150  */
 151 void
 152 intelWindowMoved(struct intel_context *intel)
 153 {
 154    GLcontext *ctx = &intel->ctx;
 155    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 156    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 157
 158    if (!intel->ctx.DrawBuffer) {
 159       /* when would this happen? -BP */
 160       assert(0);
 161       intel->numClipRects = 0;
 162    }
 163
 164    /* Update Mesa's notion of window size */
 165    driUpdateFramebufferSize(ctx, dPriv);
 166    intel_fb->Base.Initialized = GL_TRUE; /* XXX remove someday */
 167
 168    {
 169       drmI830Sarea *sarea = intel->sarea;
 170       drm_clip_rect_t drw_rect = { .x1 = dPriv->x, .x2 = dPriv->x + dPriv->w,
 171                                    .y1 = dPriv->y, .y2 = dPriv->y + dPriv->h };
 172       drm_clip_rect_t pipeA_rect = { .x1 = sarea->pipeA_x, .y1 = sarea->pipeA_y,
 173                                      .x2 = sarea->pipeA_x + sarea->pipeA_w,
 174                                      .y2 = sarea->pipeA_y + sarea->pipeA_h };
 175       drm_clip_rect_t pipeB_rect = { .x1 = sarea->pipeB_x, .y1 = sarea->pipeB_y,
 176                                      .x2 = sarea->pipeB_x + sarea->pipeB_w,
 177                                      .y2 = sarea->pipeB_y + sarea->pipeB_h };
 178       GLint areaA = driIntersectArea( drw_rect, pipeA_rect );
 179       GLint areaB = driIntersectArea( drw_rect, pipeB_rect );
 180       GLuint flags = intel_fb->vblank_flags;
 181       GLboolean pf_active;
 182       GLint pf_pipes;
 183
 184       /* Update page flipping info
 185        */
 186       pf_pipes = 0;
 187
 188       if (areaA > 0)
 189          pf_pipes |= 1;
 190
 191       if (areaB > 0)
 192          pf_pipes |= 2;
 193
 194       intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 195                                    (intel_fb->pf_pipes & 0x2)) & 0x3;
 196
 197       intel_fb->pf_num_pages = 2 /*intel->intelScreen->third.handle ? 3 : 2*/;
 198
 199       pf_active = pf_pipes && (pf_pipes & intel->sarea->pf_active) == pf_pipes;
 200
 201       if (INTEL_DEBUG & DEBUG_LOCK)
 202          if (pf_active != intel_fb->pf_active)
 203             _mesa_printf("%s - Page flipping %sactive\n", __progname,
 204                          pf_active ? "" : "in");
 205
 206       if (pf_active) {
 207          /* Sync pages between pipes if we're flipping on both at the same time */
 208          if (pf_pipes == 0x3 && pf_pipes != intel_fb->pf_pipes &&
 209              (intel->sarea->pf_current_page & 0x3) !=
 210              (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
 211             drm_i915_flip_t flip;
 212
 213             if (intel_fb->pf_current_page ==
 214                 (intel->sarea->pf_current_page & 0x3)) {
 215                /* XXX: This is ugly, but emitting two flips 'in a row' can cause
 216                 * lockups for unknown reasons.
 217                 */
 218                intel->sarea->pf_current_page =
 219                   intel->sarea->pf_current_page & 0x3;
 220                intel->sarea->pf_current_page |=
 221                   ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 222                    intel_fb->pf_num_pages) << 2;
 223
 224                flip.pipes = 0x2;
 225             } else {
 226                intel->sarea->pf_current_page =
 227                   intel->sarea->pf_current_page & (0x3 << 2);
 228                intel->sarea->pf_current_page |=
 229                   (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 230                   intel_fb->pf_num_pages;
 231
 232                flip.pipes = 0x1;
 233             }
 234
 235             drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 236          }
 237
 238          intel_fb->pf_pipes = pf_pipes;
 239       }
 240
 241       intel_fb->pf_active = pf_active;
 242       intel_flip_renderbuffers(intel_fb);
 243       intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 244
 245       /* Update vblank info
 246        */
 247       if (areaB > areaA || (areaA == areaB && areaB > 0)) {
 248          flags = intel_fb->vblank_flags | VBLANK_FLAG_SECONDARY;
 249       } else {
 250          flags = intel_fb->vblank_flags & ~VBLANK_FLAG_SECONDARY;
 251       }
 252
 253       if (flags != intel_fb->vblank_flags) {
 254          drmVBlank vbl;
 255          int i;
 256
 257          vbl.request.type = DRM_VBLANK_ABSOLUTE;
 258
 259          if ( intel_fb->vblank_flags & VBLANK_FLAG_SECONDARY ) {
 260             vbl.request.type |= DRM_VBLANK_SECONDARY;
 261          }
 262
 263          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 264             if (!intel_fb->color_rb[i])
 265                continue;
 266
 267             vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
 268             drmWaitVBlank(intel->driFd, &vbl);
 269          }
 270
 271          intel_fb->vblank_flags = flags;
 272          driGetCurrentVBlank(dPriv, intel_fb->vblank_flags, &intel_fb->vbl_seq);
 273          intel_fb->vbl_waited = intel_fb->vbl_seq;
 274
 275          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 276             if (intel_fb->color_rb[i])
 277                intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_waited;
 278          }
 279       }
 280    }
 281
 282    /* Update hardware scissor */
 283    ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 284                        ctx->Scissor.Width, ctx->Scissor.Height);
 285
 286    /* Re-calculate viewport related state */
 287    ctx->Driver.DepthRange( ctx, ctx->Viewport.Near, ctx->Viewport.Far );
 288 }
 289
 290
 291
 292 /* A true meta version of this would be very simple and additionally
 293  * machine independent.  Maybe we'll get there one day.
 294  */
 295 static void
 296 intelClearWithTris(struct intel_context *intel, GLbitfield mask)
 297 {
 298    GLcontext *ctx = &intel->ctx;
 299    struct gl_framebuffer *fb = ctx->DrawBuffer;
 300    drm_clip_rect_t clear;
 301
 302    if (INTEL_DEBUG & DEBUG_BLIT)
 303       _mesa_printf("%s 0x%x\n", __FUNCTION__, mask);
 304
 305    LOCK_HARDWARE(intel);
 306
 307    if (intel->numClipRects) {
 308       GLint cx, cy, cw, ch;
 309       GLuint buf;
 310
 311       intel->vtbl.install_meta_state(intel);
 312
 313       /* Get clear bounds after locking */
 314       cx = fb->_Xmin;
 315       cy = fb->_Ymin;
 316       ch = fb->_Ymax - cx;
 317       cw = fb->_Xmax - cy;
 318
 319       /* note: regardless of 'all', cx, cy, cw, ch are now correct */
 320       clear.x1 = cx;
 321       clear.y1 = cy;
 322       clear.x2 = cx + cw;
 323       clear.y2 = cy + ch;
 324
 325       /* Back and stencil cliprects are the same.  Try and do both
 326        * buffers at once:
 327        */
 328       if (mask &
 329           (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) {
 330          struct intel_region *backRegion =
 331             intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 332          struct intel_region *depthRegion =
 333             intel_get_rb_region(fb, BUFFER_DEPTH);
 334          const GLuint clearColor = (backRegion && backRegion->cpp == 4)
 335             ? intel->ClearColor8888 : intel->ClearColor565;
 336
 337          intel->vtbl.meta_draw_region(intel, backRegion, depthRegion);
 338
 339          if (mask & BUFFER_BIT_BACK_LEFT)
 340             intel->vtbl.meta_color_mask(intel, GL_TRUE);
 341          else
 342             intel->vtbl.meta_color_mask(intel, GL_FALSE);
 343
 344          if (mask & BUFFER_BIT_STENCIL)
 345             intel->vtbl.meta_stencil_replace(intel,
 346                                              intel->ctx.Stencil.WriteMask[0],
 347                                              intel->ctx.Stencil.Clear);
 348          else
 349             intel->vtbl.meta_no_stencil_write(intel);
 350
 351          if (mask & BUFFER_BIT_DEPTH)
 352             intel->vtbl.meta_depth_replace(intel);
 353          else
 354             intel->vtbl.meta_no_depth_write(intel);
 355
 356          /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the
 357           * drawing origin may not be correctly emitted.
 358           */
 359          intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2,
 360                               intel->ctx.Depth.Clear, clearColor, 0, 0, 0, 0);   /* texcoords */
 361
 362          mask &=
 363             ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH);
 364       }
 365
 366       /* clear the remaining (color) renderbuffers */
 367       for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
 368          const GLuint bufBit = 1 << buf;
 369          if (mask & bufBit) {
 370             struct intel_renderbuffer *irbColor =
 371                intel_renderbuffer(fb->Attachment[buf].Renderbuffer);
 372             GLuint color = (irbColor->region->cpp == 4)
 373                ? intel->ClearColor8888 : intel->ClearColor565;
 374
 375             ASSERT(irbColor);
 376
 377             intel->vtbl.meta_no_depth_write(intel);
 378             intel->vtbl.meta_no_stencil_write(intel);
 379             intel->vtbl.meta_color_mask(intel, GL_TRUE);
 380             intel->vtbl.meta_draw_region(intel, irbColor->region, NULL);
 381
 382             /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the
 383              * drawing origin may not be correctly emitted.
 384              */
 385             intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2, 0,      /* depth clear val */
 386                                  color, 0, 0, 0, 0);    /* texcoords */
 387
 388             mask &= ~bufBit;
 389          }
 390       }
 391
 392       intel->vtbl.leave_meta_state(intel);
 393       intel_batchbuffer_flush(intel->batch);
 394    }
 395    UNLOCK_HARDWARE(intel);
 396 }
 397
 398
 399 /**
 400  * Called by ctx->Driver.Clear.
 401  */
 402 static void
 403 intelClear(GLcontext *ctx, GLbitfield mask)
 404 {
 405    struct intel_context *intel = intel_context(ctx);
 406    const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
 407    GLbitfield tri_mask = 0;
 408    GLbitfield blit_mask = 0;
 409    GLbitfield swrast_mask = 0;
 410    struct gl_framebuffer *fb = ctx->DrawBuffer;
 411    GLuint i;
 412
 413    if (0)
 414       fprintf(stderr, "%s\n", __FUNCTION__);
 415
 416    /* HW color buffers (front, back, aux, generic FBO, etc) */
 417    if (colorMask == ~0) {
 418       /* clear all R,G,B,A */
 419       /* XXX FBO: need to check if colorbuffers are software RBOs! */
 420       blit_mask |= (mask & BUFFER_BITS_COLOR);
 421    }
 422    else {
 423       /* glColorMask in effect */
 424       tri_mask |= (mask & BUFFER_BITS_COLOR);
 425    }
 426
 427    /* HW stencil */
 428    if (mask & BUFFER_BIT_STENCIL) {
 429       const struct intel_region *stencilRegion
 430          = intel_get_rb_region(fb, BUFFER_STENCIL);
 431       if (stencilRegion) {
 432          /* have hw stencil */
 433          if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 434             /* not clearing all stencil bits, so use triangle clearing */
 435             tri_mask |= BUFFER_BIT_STENCIL;
 436          }
 437          else {
 438             /* clearing all stencil bits, use blitting */
 439             blit_mask |= BUFFER_BIT_STENCIL;
 440          }
 441       }
 442    }
 443
 444    /* HW depth */
 445    if (mask & BUFFER_BIT_DEPTH) {
 446       /* clear depth with whatever method is used for stencil (see above) */
 447       if (tri_mask & BUFFER_BIT_STENCIL)
 448          tri_mask |= BUFFER_BIT_DEPTH;
 449       else
 450          blit_mask |= BUFFER_BIT_DEPTH;
 451    }
 452
 453    /* SW fallback clearing */
 454    swrast_mask = mask & ~tri_mask & ~blit_mask;
 455
 456    for (i = 0; i < BUFFER_COUNT; i++) {
 457       GLuint bufBit = 1 << i;
 458       if ((blit_mask | tri_mask) & bufBit) {
 459          if (!fb->Attachment[i].Renderbuffer->ClassID) {
 460             blit_mask &= ~bufBit;
 461             tri_mask &= ~bufBit;
 462             swrast_mask |= bufBit;
 463          }
 464       }
 465    }
 466
 467
 468    intelFlush(ctx);             /* XXX intelClearWithBlit also does this */
 469
 470    if (blit_mask)
 471       intelClearWithBlit(ctx, blit_mask);
 472
 473    if (tri_mask)
 474       intelClearWithTris(intel, tri_mask);
 475
 476    if (swrast_mask)
 477       _swrast_Clear(ctx, swrast_mask);
 478 }
 479
 480
 481 /* Emit wait for pending flips */
 482 void
 483 intel_wait_flips(struct intel_context *intel, GLuint batch_flags)
 484 {
 485    struct intel_framebuffer *intel_fb =
 486       (struct intel_framebuffer *) intel->ctx.DrawBuffer;
 487    struct intel_renderbuffer *intel_rb =
 488       intel_get_renderbuffer(&intel_fb->Base,
 489                              intel_fb->Base._ColorDrawBufferMask[0] ==
 490                              BUFFER_BIT_FRONT_LEFT ? BUFFER_FRONT_LEFT :
 491                              BUFFER_BACK_LEFT);
 492
 493    if (intel_fb->Base.Name == 0 && intel_rb->pf_pending == intel_fb->pf_seq) {
 494       GLint pf_pipes = intel_fb->pf_pipes;
 495       BATCH_LOCALS;
 496
 497       /* Wait for pending flips to take effect */
 498       BEGIN_BATCH(2, batch_flags);
 499       OUT_BATCH(pf_pipes & 0x1 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_A_FLIP)
 500                 : 0);
 501       OUT_BATCH(pf_pipes & 0x2 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_B_FLIP)
 502                 : 0);
 503       ADVANCE_BATCH();
 504
 505       intel_rb->pf_pending--;
 506    }
 507 }
 508
 509 #if 0
 510 /* Flip the front & back buffers
 511  */
 512 static GLboolean
 513 intelPageFlip(const __DRIdrawablePrivate * dPriv)
 514 {
 515    struct intel_context *intel;
 516    int ret;
 517    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 518
 519    if (INTEL_DEBUG & DEBUG_IOCTL)
 520       fprintf(stderr, "%s\n", __FUNCTION__);
 521
 522    assert(dPriv);
 523    assert(dPriv->driContextPriv);
 524    assert(dPriv->driContextPriv->driverPrivate);
 525
 526    intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 527
 528    if (intel->intelScreen->drmMinor < 9)
 529       return GL_FALSE;
 530
 531    intelFlush(&intel->ctx);
 532
 533    ret = 0;
 534
 535    LOCK_HARDWARE(intel);
 536
 537    if (dPriv->numClipRects && intel_fb->pf_active) {
 538       drm_i915_flip_t flip;
 539
 540       flip.pipes = intel_fb->pf_pipes;
 541
 542       ret = drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 543    }
 544
 545    UNLOCK_HARDWARE(intel);
 546
 547    if (ret || !intel_fb->pf_active)
 548       return GL_FALSE;
 549
 550    if (!dPriv->numClipRects) {
 551       usleep(10000);    /* throttle invisible client 10ms */
 552    }
 553
 554    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 555                                 (intel_fb->pf_pipes & 0x2)) & 0x3;
 556
 557    if (dPriv->numClipRects != 0) {
 558       intel_get_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT)->pf_pending =
 559       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->pf_pending =
 560          ++intel_fb->pf_seq;
 561    }
 562
 563    intel_flip_renderbuffers(intel_fb);
 564    intel_draw_buffer(&intel->ctx, &intel_fb->Base);
 565
 566    if (INTEL_DEBUG & DEBUG_IOCTL)
 567       fprintf(stderr, "%s: success\n", __FUNCTION__);
 568
 569    return GL_TRUE;
 570 }
 571 #endif
 572
 573
 574 static GLboolean
 575 intelScheduleSwap(const __DRIdrawablePrivate * dPriv, GLboolean *missed_target)
 576 {
 577    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 578    unsigned int interval = driGetVBlankInterval(dPriv, intel_fb->vblank_flags);
 579    struct intel_context *intel =
 580       intelScreenContext(dPriv->driScreenPriv->private);
 581    const intelScreenPrivate *intelScreen = intel->intelScreen;
 582    unsigned int target;
 583    drm_i915_vblank_swap_t swap;
 584    GLboolean ret;
 585
 586    if ((intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) ||
 587         intelScreen->drmMinor < (intel_fb->pf_active ? 9 : 6))
 588       return GL_FALSE;
 589
 590    swap.seqtype = DRM_VBLANK_ABSOLUTE;
 591
 592    if (intel_fb->vblank_flags & VBLANK_FLAG_SYNC) {
 593       swap.seqtype |= DRM_VBLANK_NEXTONMISS;
 594    } else if (interval == 0) {
 595       return GL_FALSE;
 596    }
 597
 598    swap.drawable = dPriv->hHWDrawable;
 599    target = swap.sequence = intel_fb->vbl_seq + interval;
 600
 601    if ( intel_fb->vblank_flags & VBLANK_FLAG_SECONDARY ) {
 602       swap.seqtype |= DRM_VBLANK_SECONDARY;
 603    }
 604
 605    LOCK_HARDWARE(intel);
 606
 607    intel_batchbuffer_flush(intel->batch);
 608
 609    if ( intel_fb->pf_active ) {
 610       swap.seqtype |= DRM_VBLANK_FLIP;
 611
 612       intel_fb->pf_current_page = (((intel->sarea->pf_current_page >>
 613                                      (intel_fb->pf_pipes & 0x2)) & 0x3) + 1) %
 614                                   intel_fb->pf_num_pages;
 615    }
 616
 617    if (!drmCommandWriteRead(intel->driFd, DRM_I915_VBLANK_SWAP, &swap,
 618                             sizeof(swap))) {
 619       intel_fb->vbl_seq = swap.sequence;
 620       swap.sequence -= target;
 621       *missed_target = swap.sequence > 0 && swap.sequence <= (1 << 23);
 622
 623       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->vbl_pending =
 624          intel_get_renderbuffer(&intel_fb->Base,
 625                                 BUFFER_FRONT_LEFT)->vbl_pending =
 626          intel_fb->vbl_seq;
 627
 628       if (swap.seqtype & DRM_VBLANK_FLIP) {
 629          intel_flip_renderbuffers(intel_fb);
 630          intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 631       }
 632
 633       ret = GL_TRUE;
 634    } else {
 635       if (swap.seqtype & DRM_VBLANK_FLIP) {
 636          intel_fb->pf_current_page = ((intel->sarea->pf_current_page >>
 637                                         (intel_fb->pf_pipes & 0x2)) & 0x3) %
 638                                      intel_fb->pf_num_pages;
 639       }
 640
 641       ret = GL_FALSE;
 642    }
 643
 644    UNLOCK_HARDWARE(intel);
 645
 646    return ret;
 647 }
 648
 649 void
 650 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 651 {
 652    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 653       GET_CURRENT_CONTEXT(ctx);
 654       struct intel_context *intel;
 655
 656       if (ctx == NULL)
 657          return;
 658
 659       intel = intel_context(ctx);
 660
 661       if (ctx->Visual.doubleBufferMode) {
 662          GLboolean missed_target;
 663          struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 664          int64_t ust;
 665
 666          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 667
 668          if (!intelScheduleSwap(dPriv, &missed_target)) {
 669             driWaitForVBlank(dPriv, &intel_fb->vbl_seq, intel_fb->vblank_flags,
 670                              &missed_target);
 671
 672             intelCopyBuffer(dPriv, NULL);
 673          }
 674
 675          intel_fb->swap_count++;
 676          (*dri_interface->getUST) (&ust);
 677          if (missed_target) {
 678             intel_fb->swap_missed_count++;
 679             intel_fb->swap_missed_ust = ust - intel_fb->swap_ust;
 680          }
 681
 682          intel_fb->swap_ust = ust;
 683       }
 684    }
 685    else {
 686       /* XXX this shouldn't be an error but we can't handle it for now */
 687       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 688    }
 689 }
 690
 691 void
 692 intelCopySubBuffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h)
 693 {
 694    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 695       struct intel_context *intel =
 696          (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 697       GLcontext *ctx = &intel->ctx;
 698
 699       if (ctx->Visual.doubleBufferMode) {
 700          drm_clip_rect_t rect;
 701          /* fixup cliprect (driDrawable may have changed?) later */
 702          rect.x1 = x;
 703          rect.y1 = y;
 704          rect.x2 = w;
 705          rect.y2 = h;
 706          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 707          intelCopyBuffer(dPriv, &rect);
 708       }
 709    }
 710    else {
 711       /* XXX this shouldn't be an error but we can't handle it for now */
 712       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 713    }
 714 }
 715
 716
 717 /**
 718  * Update the hardware state for drawing into a window or framebuffer object.
 719  *
 720  * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 721  * places within the driver.
 722  *
 723  * Basically, this needs to be called any time the current framebuffer
 724  * changes, the renderbuffers change, or we need to draw into different
 725  * color buffers.
 726  */
 727 void
 728 intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 729 {
 730    struct intel_context *intel = intel_context(ctx);
 731    struct intel_region *colorRegion, *depthRegion = NULL;
 732    struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
 733
 734    if (!fb) {
 735       /* this can happen during the initial context initialization */
 736       return;
 737    }
 738
 739    /* Do this here, not core Mesa, since this function is called from
 740     * many places within the driver.
 741     */
 742    if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
 743       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
 744       _mesa_update_framebuffer(ctx);
 745       /* this updates the DrawBuffer's Width/Height if it's a FBO */
 746       _mesa_update_draw_buffer_bounds(ctx);
 747    }
 748
 749    if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 750       /* this may occur when we're called by glBindFrameBuffer() during
 751        * the process of someone setting up renderbuffers, etc.
 752        */
 753       /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
 754       return;
 755    }
 756
 757    if (fb->Name)
 758       intel_validate_paired_depth_stencil(ctx, fb);
 759
 760    /*
 761     * How many color buffers are we drawing into?
 762     */
 763    if (fb->_NumColorDrawBuffers[0] != 1) {
 764       /* writing to 0 or 2 or 4 color buffers */
 765       /*_mesa_debug(ctx, "Software rendering\n");*/
 766       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 767    }
 768    else {
 769       /* draw to exactly one color buffer */
 770       /*_mesa_debug(ctx, "Hardware rendering\n");*/
 771       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 772    }
 773
 774    /*
 775     * Get the intel_renderbuffer for the colorbuffer we're drawing into.
 776     * And set up cliprects.
 777     */
 778    {
 779       struct intel_renderbuffer *irb;
 780       intelSetRenderbufferClipRects(intel);
 781       irb = intel_renderbuffer(fb->_ColorDrawBuffers[0][0]);
 782       colorRegion = (irb && irb->region) ? irb->region : NULL;
 783    }
 784
 785    /* Update culling direction which changes depending on the
 786     * orientation of the buffer:
 787     */
 788    if (ctx->Driver.FrontFace)
 789       ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 790    else
 791       ctx->NewState |= _NEW_POLYGON;
 792
 793    if (!colorRegion) {
 794       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 795    }
 796    else {
 797       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 798    }
 799
 800    /***
 801     *** Get depth buffer region and check if we need a software fallback.
 802     *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
 803     ***/
 804    if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
 805       irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
 806       if (irbDepth && irbDepth->region) {
 807          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 808          depthRegion = irbDepth->region;
 809       }
 810       else {
 811          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
 812          depthRegion = NULL;
 813       }
 814    }
 815    else {
 816       /* not using depth buffer */
 817       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 818       depthRegion = NULL;
 819    }
 820
 821    /***
 822     *** Stencil buffer
 823     *** This can only be hardware accelerated if we're using a
 824     *** combined DEPTH_STENCIL buffer (for now anyway).
 825     ***/
 826    if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
 827       irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
 828       if (irbStencil && irbStencil->region) {
 829          ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
 830          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 831          /* need to re-compute stencil hw state */
 832          ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
 833          if (!depthRegion)
 834             depthRegion = irbStencil->region;
 835       }
 836       else {
 837          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
 838       }
 839    }
 840    else {
 841       /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
 842       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 843       /* need to re-compute stencil hw state */
 844       ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
 845    }
 846
 847
 848    /**
 849     ** Release old regions, reference new regions
 850     **/
 851
 852    intel->vtbl.set_draw_region(intel, colorRegion, depthRegion);
 853
 854    /* update viewport since it depends on window size */
 855    ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y,
 856                         ctx->Viewport.Width, ctx->Viewport.Height);
 857
 858    /* Update hardware scissor */
 859    ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 860                        ctx->Scissor.Width, ctx->Scissor.Height);
 861 }
 862
 863
 864 static void
 865 intelDrawBuffer(GLcontext * ctx, GLenum mode)
 866 {
 867    intel_draw_buffer(ctx, ctx->DrawBuffer);
 868 }
 869
 870
 871 static void
 872 intelReadBuffer(GLcontext * ctx, GLenum mode)
 873 {
 874    if (ctx->ReadBuffer == ctx->DrawBuffer) {
 875       /* This will update FBO completeness status.
 876        * A framebuffer will be incomplete if the GL_READ_BUFFER setting
 877        * refers to a missing renderbuffer.  Calling glReadBuffer can set
 878        * that straight and can make the drawing buffer complete.
 879        */
 880       intel_draw_buffer(ctx, ctx->DrawBuffer);
 881    }
 882    /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
 883     * reference ctx->ReadBuffer and do appropriate state checks.
 884     */
 885 }
 886
 887
 888 void
 889 intelInitBufferFuncs(struct dd_function_table *functions)
 890 {
 891    functions->Clear = intelClear;
 892    functions->DrawBuffer = intelDrawBuffer;
 893    functions->ReadBuffer = intelReadBuffer;
 894 }