src/mesa/drivers/dri/intel/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_chipset.h"
  33 #include "intel_depthstencil.h"
  34 #include "intel_fbo.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 #include "i915_drm.h"
  45
  46 /* This block can be removed when libdrm >= 2.3.1 is required */
  47
  48 #ifndef DRM_IOCTL_I915_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 #define FILE_DEBUG_FLAG DEBUG_BLIT
  63
  64 /**
  65  * XXX move this into a new dri/common/cliprects.c file.
  66  */
  67 GLboolean
  68 intel_intersect_cliprects(drm_clip_rect_t * dst,
  69                           const drm_clip_rect_t * a,
  70                           const drm_clip_rect_t * b)
  71 {
  72    GLint bx = b->x1;
  73    GLint by = b->y1;
  74    GLint bw = b->x2 - bx;
  75    GLint bh = b->y2 - by;
  76
  77    if (bx < a->x1)
  78       bw -= a->x1 - bx, bx = a->x1;
  79    if (by < a->y1)
  80       bh -= a->y1 - by, by = a->y1;
  81    if (bx + bw > a->x2)
  82       bw = a->x2 - bx;
  83    if (by + bh > a->y2)
  84       bh = a->y2 - by;
  85    if (bw <= 0)
  86       return GL_FALSE;
  87    if (bh <= 0)
  88       return GL_FALSE;
  89
  90    dst->x1 = bx;
  91    dst->y1 = by;
  92    dst->x2 = bx + bw;
  93    dst->y2 = by + bh;
  94
  95    return GL_TRUE;
  96 }
  97
  98 /**
  99  * Return pointer to current color drawing region, or NULL.
 100  */
 101 struct intel_region *
 102 intel_drawbuf_region(struct intel_context *intel)
 103 {
 104    struct intel_renderbuffer *irbColor =
 105       intel_renderbuffer(intel->ctx.DrawBuffer->_ColorDrawBuffers[0]);
 106    if (irbColor)
 107       return irbColor->region;
 108    else
 109       return NULL;
 110 }
 111
 112 /**
 113  * Return pointer to current color reading region, or NULL.
 114  */
 115 struct intel_region *
 116 intel_readbuf_region(struct intel_context *intel)
 117 {
 118    struct intel_renderbuffer *irb
 119       = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
 120    if (irb)
 121       return irb->region;
 122    else
 123       return NULL;
 124 }
 125
 126
 127
 128 /**
 129  * Update the following fields for rendering to a user-created FBO:
 130  *   intel->numClipRects
 131  *   intel->pClipRects
 132  *   intel->drawX
 133  *   intel->drawY
 134  */
 135 static void
 136 intelSetRenderbufferClipRects(struct intel_context *intel)
 137 {
 138    assert(intel->ctx.DrawBuffer->Width > 0);
 139    assert(intel->ctx.DrawBuffer->Height > 0);
 140    intel->fboRect.x1 = 0;
 141    intel->fboRect.y1 = 0;
 142    intel->fboRect.x2 = intel->ctx.DrawBuffer->Width;
 143    intel->fboRect.y2 = intel->ctx.DrawBuffer->Height;
 144    intel->numClipRects = 1;
 145    intel->pClipRects = &intel->fboRect;
 146    intel->drawX = 0;
 147    intel->drawY = 0;
 148 }
 149
 150
 151 /**
 152  * As above, but for rendering to front buffer of a window.
 153  * \sa intelSetRenderbufferClipRects
 154  */
 155 static void
 156 intelSetFrontClipRects(struct intel_context *intel)
 157 {
 158    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 159
 160    if (!dPriv)
 161       return;
 162
 163    intel->numClipRects = dPriv->numClipRects;
 164    intel->pClipRects = dPriv->pClipRects;
 165    intel->drawX = dPriv->x;
 166    intel->drawY = dPriv->y;
 167 }
 168
 169
 170 /**
 171  * As above, but for rendering to back buffer of a window.
 172  */
 173 static void
 174 intelSetBackClipRects(struct intel_context *intel)
 175 {
 176    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 177    struct intel_framebuffer *intel_fb;
 178
 179    if (!dPriv)
 180       return;
 181
 182    intel_fb = dPriv->driverPrivate;
 183
 184    if (intel_fb->pf_active || dPriv->numBackClipRects == 0) {
 185       /* use the front clip rects */
 186       intel->numClipRects = dPriv->numClipRects;
 187       intel->pClipRects = dPriv->pClipRects;
 188       intel->drawX = dPriv->x;
 189       intel->drawY = dPriv->y;
 190    }
 191    else {
 192       /* use the back clip rects */
 193       intel->numClipRects = dPriv->numBackClipRects;
 194       intel->pClipRects = dPriv->pBackClipRects;
 195       intel->drawX = dPriv->backX;
 196       intel->drawY = dPriv->backY;
 197    }
 198 }
 199
 200 #ifdef I915
 201 static void
 202 intelUpdatePageFlipping(struct intel_context *intel,
 203                         GLint areaA, GLint areaB)
 204 {
 205    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 206    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 207    GLboolean pf_active;
 208    GLint pf_planes;
 209
 210    /* Update page flipping info */
 211    pf_planes = 0;
 212
 213    if (areaA > 0)
 214       pf_planes |= 1;
 215
 216    if (areaB > 0)
 217       pf_planes |= 2;
 218
 219    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 220                                 (intel_fb->pf_planes & 0x2)) & 0x3;
 221
 222    intel_fb->pf_num_pages = intel->intelScreen->third.handle ? 3 : 2;
 223
 224    pf_active = pf_planes && (pf_planes & intel->sarea->pf_active) == pf_planes;
 225
 226    if (INTEL_DEBUG & DEBUG_LOCK)
 227       if (pf_active != intel_fb->pf_active)
 228          _mesa_printf("%s - Page flipping %sactive\n", __progname,
 229                       pf_active ? "" : "in");
 230
 231    if (pf_active) {
 232       /* Sync pages between planes if flipping on both at the same time */
 233       if (pf_planes == 0x3 && pf_planes != intel_fb->pf_planes &&
 234           (intel->sarea->pf_current_page & 0x3) !=
 235           (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
 236          drm_i915_flip_t flip;
 237
 238          if (intel_fb->pf_current_page ==
 239              (intel->sarea->pf_current_page & 0x3)) {
 240             /* XXX: This is ugly, but emitting two flips 'in a row' can cause
 241              * lockups for unknown reasons.
 242              */
 243             intel->sarea->pf_current_page =
 244                intel->sarea->pf_current_page & 0x3;
 245             intel->sarea->pf_current_page |=
 246                ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 247                 intel_fb->pf_num_pages) << 2;
 248
 249             flip.pipes = 0x2;
 250          } else {
 251             intel->sarea->pf_current_page =
 252                intel->sarea->pf_current_page & (0x3 << 2);
 253             intel->sarea->pf_current_page |=
 254                (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 255                intel_fb->pf_num_pages;
 256
 257             flip.pipes = 0x1;
 258          }
 259
 260          drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 261       }
 262
 263       intel_fb->pf_planes = pf_planes;
 264    }
 265
 266    intel_fb->pf_active = pf_active;
 267    intel_flip_renderbuffers(intel_fb);
 268    intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 269 }
 270 #endif /* I915 */
 271
 272 /**
 273  * This will be called whenever the currently bound window is moved/resized.
 274  * XXX: actually, it seems to NOT be called when the window is only moved (BP).
 275  */
 276 void
 277 intelWindowMoved(struct intel_context *intel)
 278 {
 279    GLcontext *ctx = &intel->ctx;
 280    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 281    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 282
 283    if (!intel->ctx.DrawBuffer) {
 284       /* when would this happen? -BP */
 285       intelSetFrontClipRects(intel);
 286    }
 287    else if (intel->ctx.DrawBuffer->Name != 0) {
 288       /* drawing to user-created FBO - do nothing */
 289       /* Cliprects would be set from intelDrawBuffer() */
 290    }
 291    else {
 292       /* drawing to a window */
 293       switch (intel_fb->Base._ColorDrawBufferIndexes[0]) {
 294       case BUFFER_FRONT_LEFT:
 295          intelSetFrontClipRects(intel);
 296          break;
 297       case BUFFER_BACK_LEFT:
 298          intelSetBackClipRects(intel);
 299          break;
 300       default:
 301          intelSetFrontClipRects(intel);
 302       }
 303    }
 304
 305    if (intel->intelScreen->driScrnPriv->ddx_version.minor >= 7) {
 306       volatile drmI830Sarea *sarea = intel->sarea;
 307       drm_clip_rect_t drw_rect = { .x1 = dPriv->x, .x2 = dPriv->x + dPriv->w,
 308                                    .y1 = dPriv->y, .y2 = dPriv->y + dPriv->h };
 309       drm_clip_rect_t planeA_rect = { .x1 = sarea->planeA_x, .y1 = sarea->planeA_y,
 310                                      .x2 = sarea->planeA_x + sarea->planeA_w,
 311                                      .y2 = sarea->planeA_y + sarea->planeA_h };
 312       drm_clip_rect_t planeB_rect = { .x1 = sarea->planeB_x, .y1 = sarea->planeB_y,
 313                                      .x2 = sarea->planeB_x + sarea->planeB_w,
 314                                      .y2 = sarea->planeB_y + sarea->planeB_h };
 315       GLint areaA = driIntersectArea( drw_rect, planeA_rect );
 316       GLint areaB = driIntersectArea( drw_rect, planeB_rect );
 317       GLuint flags = dPriv->vblFlags;
 318
 319 #ifdef I915
 320       intelUpdatePageFlipping(intel, areaA, areaB);
 321 #endif
 322
 323       /* Update vblank info
 324        */
 325       if (areaB > areaA || (areaA == areaB && areaB > 0)) {
 326          flags = dPriv->vblFlags | VBLANK_FLAG_SECONDARY;
 327       } else {
 328          flags = dPriv->vblFlags & ~VBLANK_FLAG_SECONDARY;
 329       }
 330
 331       /* Check to see if we changed pipes */
 332       if (flags != dPriv->vblFlags && dPriv->vblFlags &&
 333           !(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ)) {
 334          int64_t count;
 335          drmVBlank vbl;
 336          int i;
 337
 338          /*
 339           * Deal with page flipping
 340           */
 341          vbl.request.type = DRM_VBLANK_ABSOLUTE;
 342
 343          if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 344             vbl.request.type |= DRM_VBLANK_SECONDARY;
 345          }
 346
 347          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 348             if (!intel_fb->color_rb[i] ||
 349                 (intel_fb->vbl_waited - intel_fb->color_rb[i]->vbl_pending) <=
 350                 (1<<23))
 351                continue;
 352
 353             vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
 354             drmWaitVBlank(intel->driFd, &vbl);
 355          }
 356
 357          /*
 358           * Update msc_base from old pipe
 359           */
 360          driDrawableGetMSC32(dPriv->driScreenPriv, dPriv, &count);
 361          dPriv->msc_base = count;
 362          /*
 363           * Then get new vblank_base and vblSeq values
 364           */
 365          dPriv->vblFlags = flags;
 366          driGetCurrentVBlank(dPriv);
 367          dPriv->vblank_base = dPriv->vblSeq;
 368
 369          intel_fb->vbl_waited = dPriv->vblSeq;
 370
 371          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 372             if (intel_fb->color_rb[i])
 373                intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_waited;
 374          }
 375       }
 376    } else {
 377       dPriv->vblFlags &= ~VBLANK_FLAG_SECONDARY;
 378    }
 379
 380    /* Update Mesa's notion of window size */
 381    driUpdateFramebufferSize(ctx, dPriv);
 382    intel_fb->Base.Initialized = GL_TRUE; /* XXX remove someday */
 383
 384    /* Update hardware scissor */
 385    if (ctx->Driver.Scissor != NULL) {
 386       ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 387                           ctx->Scissor.Width, ctx->Scissor.Height);
 388    }
 389
 390    /* Re-calculate viewport related state */
 391    if (ctx->Driver.DepthRange != NULL)
 392       ctx->Driver.DepthRange( ctx, ctx->Viewport.Near, ctx->Viewport.Far );
 393 }
 394
 395
 396
 397 /* A true meta version of this would be very simple and additionally
 398  * machine independent.  Maybe we'll get there one day.
 399  */
 400 static void
 401 intelClearWithTris(struct intel_context *intel, GLbitfield mask)
 402 {
 403    GLcontext *ctx = &intel->ctx;
 404    struct gl_framebuffer *fb = ctx->DrawBuffer;
 405    GLuint buf;
 406
 407    intel->vtbl.install_meta_state(intel);
 408
 409    /* Back and stencil cliprects are the same.  Try and do both
 410     * buffers at once:
 411     */
 412    if (mask & (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) {
 413       struct intel_region *backRegion =
 414          intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 415       struct intel_region *depthRegion =
 416          intel_get_rb_region(fb, BUFFER_DEPTH);
 417
 418       intel->vtbl.meta_draw_region(intel, backRegion, depthRegion);
 419
 420       if (mask & BUFFER_BIT_BACK_LEFT)
 421          intel->vtbl.meta_color_mask(intel, GL_TRUE);
 422       else
 423          intel->vtbl.meta_color_mask(intel, GL_FALSE);
 424
 425       if (mask & BUFFER_BIT_STENCIL)
 426          intel->vtbl.meta_stencil_replace(intel,
 427                                           intel->ctx.Stencil.WriteMask[0],
 428                                           intel->ctx.Stencil.Clear);
 429       else
 430          intel->vtbl.meta_no_stencil_write(intel);
 431
 432       if (mask & BUFFER_BIT_DEPTH)
 433          intel->vtbl.meta_depth_replace(intel);
 434       else
 435          intel->vtbl.meta_no_depth_write(intel);
 436
 437       intel->vtbl.meta_draw_quad(intel,
 438                                  fb->_Xmin,
 439                                  fb->_Xmax,
 440                                  fb->_Ymin,
 441                                  fb->_Ymax,
 442                                  intel->ctx.Depth.Clear,
 443                                  intel->ClearColor8888,
 444                                  0, 0, 0, 0);   /* texcoords */
 445
 446       mask &= ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH);
 447    }
 448
 449    /* clear the remaining (color) renderbuffers */
 450    for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
 451       const GLuint bufBit = 1 << buf;
 452       if (mask & bufBit) {
 453          struct intel_renderbuffer *irbColor =
 454             intel_renderbuffer(fb->Attachment[buf].Renderbuffer);
 455
 456          ASSERT(irbColor);
 457
 458          intel->vtbl.meta_no_depth_write(intel);
 459          intel->vtbl.meta_no_stencil_write(intel);
 460          intel->vtbl.meta_color_mask(intel, GL_TRUE);
 461          intel->vtbl.meta_draw_region(intel, irbColor->region, NULL);
 462
 463          intel->vtbl.meta_draw_quad(intel,
 464                                     fb->_Xmin,
 465                                     fb->_Xmax,
 466                                     fb->_Ymin,
 467                                     fb->_Ymax,
 468                                     0, intel->ClearColor8888,
 469                                     0, 0, 0, 0);   /* texcoords */
 470
 471          mask &= ~bufBit;
 472       }
 473    }
 474
 475    intel->vtbl.leave_meta_state(intel);
 476 }
 477
 478 static const char *buffer_names[] = {
 479    [BUFFER_FRONT_LEFT] = "front",
 480    [BUFFER_BACK_LEFT] = "back",
 481    [BUFFER_FRONT_RIGHT] = "front right",
 482    [BUFFER_BACK_RIGHT] = "back right",
 483    [BUFFER_AUX0] = "aux0",
 484    [BUFFER_AUX1] = "aux1",
 485    [BUFFER_AUX2] = "aux2",
 486    [BUFFER_AUX3] = "aux3",
 487    [BUFFER_DEPTH] = "depth",
 488    [BUFFER_STENCIL] = "stencil",
 489    [BUFFER_ACCUM] = "accum",
 490    [BUFFER_COLOR0] = "color0",
 491    [BUFFER_COLOR1] = "color1",
 492    [BUFFER_COLOR2] = "color2",
 493    [BUFFER_COLOR3] = "color3",
 494    [BUFFER_COLOR4] = "color4",
 495    [BUFFER_COLOR5] = "color5",
 496    [BUFFER_COLOR6] = "color6",
 497    [BUFFER_COLOR7] = "color7",
 498 };
 499
 500 /**
 501  * Called by ctx->Driver.Clear.
 502  */
 503 static void
 504 intelClear(GLcontext *ctx, GLbitfield mask)
 505 {
 506    struct intel_context *intel = intel_context(ctx);
 507    const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
 508    GLbitfield tri_mask = 0;
 509    GLbitfield blit_mask = 0;
 510    GLbitfield swrast_mask = 0;
 511    struct gl_framebuffer *fb = ctx->DrawBuffer;
 512    GLuint i;
 513
 514    if (0)
 515       fprintf(stderr, "%s\n", __FUNCTION__);
 516
 517    /* HW color buffers (front, back, aux, generic FBO, etc) */
 518    if (colorMask == ~0) {
 519       /* clear all R,G,B,A */
 520       /* XXX FBO: need to check if colorbuffers are software RBOs! */
 521       blit_mask |= (mask & BUFFER_BITS_COLOR);
 522    }
 523    else {
 524       /* glColorMask in effect */
 525       tri_mask |= (mask & BUFFER_BITS_COLOR);
 526    }
 527
 528    /* HW stencil */
 529    if (mask & BUFFER_BIT_STENCIL) {
 530       const struct intel_region *stencilRegion
 531          = intel_get_rb_region(fb, BUFFER_STENCIL);
 532       if (stencilRegion) {
 533          /* have hw stencil */
 534          if (IS_965(intel->intelScreen->deviceID) ||
 535              (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 536             /* We have to use the 3D engine if we're clearing a partial mask
 537              * of the stencil buffer, or if we're on a 965 which has a tiled
 538              * depth/stencil buffer in a layout we can't blit to.
 539              */
 540             tri_mask |= BUFFER_BIT_STENCIL;
 541          }
 542          else {
 543             /* clearing all stencil bits, use blitting */
 544             blit_mask |= BUFFER_BIT_STENCIL;
 545          }
 546       }
 547    }
 548
 549    /* HW depth */
 550    if (mask & BUFFER_BIT_DEPTH) {
 551       /* clear depth with whatever method is used for stencil (see above) */
 552       if (IS_965(intel->intelScreen->deviceID) ||
 553           tri_mask & BUFFER_BIT_STENCIL)
 554          tri_mask |= BUFFER_BIT_DEPTH;
 555       else
 556          blit_mask |= BUFFER_BIT_DEPTH;
 557    }
 558
 559    /* SW fallback clearing */
 560    swrast_mask = mask & ~tri_mask & ~blit_mask;
 561
 562    for (i = 0; i < BUFFER_COUNT; i++) {
 563       GLuint bufBit = 1 << i;
 564       if ((blit_mask | tri_mask) & bufBit) {
 565          if (!fb->Attachment[i].Renderbuffer->ClassID) {
 566             blit_mask &= ~bufBit;
 567             tri_mask &= ~bufBit;
 568             swrast_mask |= bufBit;
 569          }
 570       }
 571    }
 572
 573    if (blit_mask) {
 574       if (INTEL_DEBUG & DEBUG_BLIT) {
 575          DBG("blit clear:");
 576          for (i = 0; i < BUFFER_COUNT; i++) {
 577             if (blit_mask & (1 << i))
 578                DBG(" %s", buffer_names[i]);
 579          }
 580          DBG("\n");
 581       }
 582       intelClearWithBlit(ctx, blit_mask);
 583    }
 584
 585    if (tri_mask) {
 586       if (INTEL_DEBUG & DEBUG_BLIT) {
 587          DBG("tri clear:");
 588          for (i = 0; i < BUFFER_COUNT; i++) {
 589             if (tri_mask & (1 << i))
 590                DBG(" %s", buffer_names[i]);
 591          }
 592          DBG("\n");
 593       }
 594       intelClearWithTris(intel, tri_mask);
 595    }
 596
 597    if (swrast_mask) {
 598       if (INTEL_DEBUG & DEBUG_BLIT) {
 599          DBG("swrast clear:");
 600          for (i = 0; i < BUFFER_COUNT; i++) {
 601             if (swrast_mask & (1 << i))
 602                DBG(" %s", buffer_names[i]);
 603          }
 604          DBG("\n");
 605       }
 606       _swrast_Clear(ctx, swrast_mask);
 607    }
 608 }
 609
 610
 611 /* Emit wait for pending flips */
 612 void
 613 intel_wait_flips(struct intel_context *intel)
 614 {
 615    struct intel_framebuffer *intel_fb =
 616       (struct intel_framebuffer *) intel->ctx.DrawBuffer;
 617    struct intel_renderbuffer *intel_rb =
 618       intel_get_renderbuffer(&intel_fb->Base,
 619                              intel_fb->Base._ColorDrawBufferIndexes[0] ==
 620                              BUFFER_FRONT_LEFT ? BUFFER_FRONT_LEFT :
 621                              BUFFER_BACK_LEFT);
 622
 623    if (intel_fb->Base.Name == 0 && intel_rb &&
 624        intel_rb->pf_pending == intel_fb->pf_seq) {
 625       GLint pf_planes = intel_fb->pf_planes;
 626       BATCH_LOCALS;
 627
 628       /* Wait for pending flips to take effect */
 629       BEGIN_BATCH(2, NO_LOOP_CLIPRECTS);
 630       OUT_BATCH(pf_planes & 0x1 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_A_FLIP)
 631                 : 0);
 632       OUT_BATCH(pf_planes & 0x2 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_B_FLIP)
 633                 : 0);
 634       ADVANCE_BATCH();
 635
 636       intel_rb->pf_pending--;
 637    }
 638 }
 639
 640
 641 /* Flip the front & back buffers
 642  */
 643 static GLboolean
 644 intelPageFlip(const __DRIdrawablePrivate * dPriv)
 645 {
 646 #ifdef I915
 647    struct intel_context *intel;
 648    int ret;
 649    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 650
 651    if (INTEL_DEBUG & DEBUG_IOCTL)
 652       fprintf(stderr, "%s\n", __FUNCTION__);
 653
 654    assert(dPriv);
 655    assert(dPriv->driContextPriv);
 656    assert(dPriv->driContextPriv->driverPrivate);
 657
 658    intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 659
 660    if (intel->intelScreen->drmMinor < 9)
 661       return GL_FALSE;
 662
 663    intelFlush(&intel->ctx);
 664
 665    ret = 0;
 666
 667    LOCK_HARDWARE(intel);
 668
 669    if (dPriv->numClipRects && intel_fb->pf_active) {
 670       drm_i915_flip_t flip;
 671
 672       flip.pipes = intel_fb->pf_planes;
 673
 674       ret = drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 675    }
 676
 677    UNLOCK_HARDWARE(intel);
 678
 679    if (ret || !intel_fb->pf_active)
 680       return GL_FALSE;
 681
 682    if (!dPriv->numClipRects) {
 683       usleep(10000);    /* throttle invisible client 10ms */
 684    }
 685
 686    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 687                                 (intel_fb->pf_planes & 0x2)) & 0x3;
 688
 689    if (dPriv->numClipRects != 0) {
 690       intel_get_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT)->pf_pending =
 691       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->pf_pending =
 692          ++intel_fb->pf_seq;
 693    }
 694
 695    intel_flip_renderbuffers(intel_fb);
 696    intel_draw_buffer(&intel->ctx, &intel_fb->Base);
 697
 698    return GL_TRUE;
 699 #else
 700    return GL_FALSE;
 701 #endif
 702 }
 703
 704 #if 0
 705 void
 706 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 707 {
 708    if (dPriv->driverPrivate) {
 709       const struct gl_framebuffer *fb
 710          = (struct gl_framebuffer *) dPriv->driverPrivate;
 711       if (fb->Visual.doubleBufferMode) {
 712          GET_CURRENT_CONTEXT(ctx);
 713          if (ctx && ctx->DrawBuffer == fb) {
 714             _mesa_notifySwapBuffers(ctx);       /* flush pending rendering */
 715          }
 716          if (intel->doPageFlip) {
 717             intelPageFlip(dPriv);
 718          }
 719          else {
 720             intelCopyBuffer(dPriv);
 721          }
 722       }
 723    }
 724    else {
 725       _mesa_problem(NULL,
 726                     "dPriv has no gl_framebuffer pointer in intelSwapBuffers");
 727    }
 728 }
 729 #else
 730 /* Trunk version:
 731  */
 732
 733 static GLboolean
 734 intelScheduleSwap(__DRIdrawablePrivate * dPriv, GLboolean *missed_target)
 735 {
 736    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 737    unsigned int interval;
 738    struct intel_context *intel =
 739       intelScreenContext(dPriv->driScreenPriv->private);
 740    const intelScreenPrivate *intelScreen = intel->intelScreen;
 741    unsigned int target;
 742    drm_i915_vblank_swap_t swap;
 743    GLboolean ret;
 744
 745    if (!dPriv->vblFlags ||
 746        (dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) ||
 747        intelScreen->drmMinor < (intel_fb->pf_active ? 9 : 6))
 748       return GL_FALSE;
 749
 750    interval = driGetVBlankInterval(dPriv);
 751
 752    swap.seqtype = DRM_VBLANK_ABSOLUTE;
 753
 754    if (dPriv->vblFlags & VBLANK_FLAG_SYNC) {
 755       swap.seqtype |= DRM_VBLANK_NEXTONMISS;
 756    } else if (interval == 0) {
 757       return GL_FALSE;
 758    }
 759
 760    swap.drawable = dPriv->hHWDrawable;
 761    target = swap.sequence = dPriv->vblSeq + interval;
 762
 763    if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 764       swap.seqtype |= DRM_VBLANK_SECONDARY;
 765    }
 766
 767    LOCK_HARDWARE(intel);
 768
 769    intel_batchbuffer_flush(intel->batch);
 770
 771    if ( intel_fb->pf_active ) {
 772       swap.seqtype |= DRM_VBLANK_FLIP;
 773
 774       intel_fb->pf_current_page = (((intel->sarea->pf_current_page >>
 775                                      (intel_fb->pf_planes & 0x2)) & 0x3) + 1) %
 776                                   intel_fb->pf_num_pages;
 777    }
 778
 779    if (!drmCommandWriteRead(intel->driFd, DRM_I915_VBLANK_SWAP, &swap,
 780                             sizeof(swap))) {
 781       dPriv->vblSeq = swap.sequence;
 782       swap.sequence -= target;
 783       *missed_target = swap.sequence > 0 && swap.sequence <= (1 << 23);
 784
 785       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->vbl_pending =
 786          intel_get_renderbuffer(&intel_fb->Base,
 787                                 BUFFER_FRONT_LEFT)->vbl_pending =
 788          dPriv->vblSeq;
 789
 790       if (swap.seqtype & DRM_VBLANK_FLIP) {
 791          intel_flip_renderbuffers(intel_fb);
 792          intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 793       }
 794
 795       ret = GL_TRUE;
 796    } else {
 797       if (swap.seqtype & DRM_VBLANK_FLIP) {
 798          intel_fb->pf_current_page = ((intel->sarea->pf_current_page >>
 799                                         (intel_fb->pf_planes & 0x2)) & 0x3) %
 800                                      intel_fb->pf_num_pages;
 801       }
 802
 803       ret = GL_FALSE;
 804    }
 805
 806    UNLOCK_HARDWARE(intel);
 807
 808    return ret;
 809 }
 810
 811 void
 812 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 813 {
 814    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 815       GET_CURRENT_CONTEXT(ctx);
 816       struct intel_context *intel;
 817
 818       if (ctx == NULL)
 819          return;
 820
 821       intel = intel_context(ctx);
 822
 823       if (ctx->Visual.doubleBufferMode) {
 824          GLboolean missed_target;
 825          struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 826          int64_t ust;
 827
 828          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 829
 830          if (!intelScheduleSwap(dPriv, &missed_target)) {
 831             driWaitForVBlank(dPriv, &missed_target);
 832
 833             if (!intelPageFlip(dPriv)) {
 834                intelCopyBuffer(dPriv, NULL);
 835             }
 836          }
 837
 838          intel_fb->swap_count++;
 839          (*dri_interface->getUST) (&ust);
 840          if (missed_target) {
 841             intel_fb->swap_missed_count++;
 842             intel_fb->swap_missed_ust = ust - intel_fb->swap_ust;
 843          }
 844
 845          intel_fb->swap_ust = ust;
 846       }
 847    }
 848    else {
 849       /* XXX this shouldn't be an error but we can't handle it for now */
 850       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 851    }
 852 }
 853 #endif
 854
 855 void
 856 intelCopySubBuffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h)
 857 {
 858    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 859       struct intel_context *intel =
 860          (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 861       GLcontext *ctx = &intel->ctx;
 862
 863       if (ctx->Visual.doubleBufferMode) {
 864          drm_clip_rect_t rect;
 865          rect.x1 = x + dPriv->x;
 866          rect.y1 = (dPriv->h - y - h) + dPriv->y;
 867          rect.x2 = rect.x1 + w;
 868          rect.y2 = rect.y1 + h;
 869          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 870          intelCopyBuffer(dPriv, &rect);
 871       }
 872    }
 873    else {
 874       /* XXX this shouldn't be an error but we can't handle it for now */
 875       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 876    }
 877 }
 878
 879
 880 /**
 881  * Update the hardware state for drawing into a window or framebuffer object.
 882  *
 883  * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 884  * places within the driver.
 885  *
 886  * Basically, this needs to be called any time the current framebuffer
 887  * changes, the renderbuffers change, or we need to draw into different
 888  * color buffers.
 889  */
 890 void
 891 intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 892 {
 893    struct intel_context *intel = intel_context(ctx);
 894    struct intel_region *colorRegion, *depthRegion = NULL;
 895    struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
 896    int front = 0;               /* drawing to front color buffer? */
 897
 898    if (!fb) {
 899       /* this can happen during the initial context initialization */
 900       return;
 901    }
 902
 903    /* Do this here, note core Mesa, since this function is called from
 904     * many places within the driver.
 905     */
 906    if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
 907       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
 908       _mesa_update_framebuffer(ctx);
 909       /* this updates the DrawBuffer's Width/Height if it's a FBO */
 910       _mesa_update_draw_buffer_bounds(ctx);
 911    }
 912
 913    if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 914       /* this may occur when we're called by glBindFrameBuffer() during
 915        * the process of someone setting up renderbuffers, etc.
 916        */
 917       /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
 918       return;
 919    }
 920
 921    if (fb->Name)
 922       intel_validate_paired_depth_stencil(ctx, fb);
 923
 924    /* If the batch contents require looping over cliprects, flush them before
 925     * we go changing which cliprects get referenced when that happens.
 926     */
 927    if (intel->batch->cliprect_mode == LOOP_CLIPRECTS)
 928       intel_batchbuffer_flush(intel->batch);
 929
 930    /*
 931     * How many color buffers are we drawing into?
 932     */
 933    if (fb->_NumColorDrawBuffers != 1) {
 934       /* writing to 0 or 2 or 4 color buffers */
 935       /*_mesa_debug(ctx, "Software rendering\n");*/
 936       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 937       colorRegion = NULL;
 938
 939       if (fb->Name != 0)
 940          intelSetRenderbufferClipRects(intel);
 941    }
 942    else {
 943       /* draw to exactly one color buffer */
 944       /*_mesa_debug(ctx, "Hardware rendering\n");*/
 945       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 946       if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
 947          front = 1;
 948       }
 949
 950       /*
 951        * Get the intel_renderbuffer for the colorbuffer we're drawing into.
 952        * And set up cliprects.
 953        */
 954       if (fb->Name == 0) {
 955          /* drawing to window system buffer */
 956          if (front) {
 957             intelSetFrontClipRects(intel);
 958             colorRegion = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
 959          }
 960          else {
 961             intelSetBackClipRects(intel);
 962             colorRegion = intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 963          }
 964       }
 965       else {
 966          /* drawing to user-created FBO */
 967          struct intel_renderbuffer *irb;
 968          intelSetRenderbufferClipRects(intel);
 969          irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]);
 970          colorRegion = (irb && irb->region) ? irb->region : NULL;
 971       }
 972    }
 973
 974    /* Update culling direction which changes depending on the
 975     * orientation of the buffer:
 976     */
 977    if (ctx->Driver.FrontFace)
 978       ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 979    else
 980       ctx->NewState |= _NEW_POLYGON;
 981
 982    if (!colorRegion) {
 983       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 984    }
 985    else {
 986       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 987    }
 988
 989    /***
 990     *** Get depth buffer region and check if we need a software fallback.
 991     *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
 992     ***/
 993    if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
 994       irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
 995       if (irbDepth && irbDepth->region) {
 996          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 997          depthRegion = irbDepth->region;
 998       }
 999       else {
1000          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
1001          depthRegion = NULL;
1002       }
1003    }
1004    else {
1005       /* not using depth buffer */
1006       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
1007       depthRegion = NULL;
1008    }
1009
1010    /***
1011     *** Stencil buffer
1012     *** This can only be hardware accelerated if we're using a
1013     *** combined DEPTH_STENCIL buffer (for now anyway).
1014     ***/
1015    if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
1016       irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
1017       if (irbStencil && irbStencil->region) {
1018          ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
1019          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
1020          /* need to re-compute stencil hw state */
1021          if (ctx->Driver.Enable != NULL)
1022             ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
1023          else
1024             ctx->NewState |= _NEW_STENCIL;
1025          if (!depthRegion)
1026             depthRegion = irbStencil->region;
1027       }
1028       else {
1029          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
1030       }
1031    }
1032    else {
1033       /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
1034       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
1035       /* need to re-compute stencil hw state */
1036       if (ctx->Driver.Enable != NULL)
1037          ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
1038       else
1039          ctx->NewState |= _NEW_STENCIL;
1040    }
1041
1042    /*
1043     * Update depth test state
1044     */
1045    if (ctx->Driver.Enable) {
1046       if (ctx->Depth.Test && fb->Visual.depthBits > 0) {
1047          ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_TRUE);
1048       } else {
1049          ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_FALSE);
1050       }
1051    } else {
1052       ctx->NewState |= _NEW_DEPTH;
1053    }
1054
1055    intel->vtbl.set_draw_region(intel, colorRegion, depthRegion);
1056
1057    /* update viewport since it depends on window size */
1058    if (ctx->Driver.Viewport) {
1059       ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y,
1060                            ctx->Viewport.Width, ctx->Viewport.Height);
1061    } else {
1062       ctx->NewState |= _NEW_VIEWPORT;
1063    }
1064
1065    /* Set state we know depends on drawable parameters:
1066     */
1067    if (ctx->Driver.Scissor)
1068       ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
1069                           ctx->Scissor.Width, ctx->Scissor.Height);
1070    intel->NewGLState |= _NEW_SCISSOR;
1071
1072    if (ctx->Driver.DepthRange)
1073       ctx->Driver.DepthRange(ctx,
1074                              ctx->Viewport.Near,
1075                              ctx->Viewport.Far);
1076 }
1077
1078
1079 static void
1080 intelDrawBuffer(GLcontext * ctx, GLenum mode)
1081 {
1082    intel_draw_buffer(ctx, ctx->DrawBuffer);
1083 }
1084
1085
1086 static void
1087 intelReadBuffer(GLcontext * ctx, GLenum mode)
1088 {
1089    if (ctx->ReadBuffer == ctx->DrawBuffer) {
1090       /* This will update FBO completeness status.
1091        * A framebuffer will be incomplete if the GL_READ_BUFFER setting
1092        * refers to a missing renderbuffer.  Calling glReadBuffer can set
1093        * that straight and can make the drawing buffer complete.
1094        */
1095       intel_draw_buffer(ctx, ctx->DrawBuffer);
1096    }
1097    /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
1098     * reference ctx->ReadBuffer and do appropriate state checks.
1099     */
1100 }
1101
1102
1103 void
1104 intelInitBufferFuncs(struct dd_function_table *functions)
1105 {
1106    functions->Clear = intelClear;
1107    functions->DrawBuffer = intelDrawBuffer;
1108    functions->ReadBuffer = intelReadBuffer;
1109 }