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 static void
 201 intelUpdatePageFlipping(struct intel_context *intel,
 202                         GLint areaA, GLint areaB)
 203 {
 204    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 205    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 206    GLboolean pf_active;
 207    GLint pf_planes;
 208
 209    /* Update page flipping info */
 210    pf_planes = 0;
 211
 212    if (areaA > 0)
 213       pf_planes |= 1;
 214
 215    if (areaB > 0)
 216       pf_planes |= 2;
 217
 218    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 219                                 (intel_fb->pf_planes & 0x2)) & 0x3;
 220
 221    intel_fb->pf_num_pages = intel->intelScreen->third.handle ? 3 : 2;
 222
 223    pf_active = pf_planes && (pf_planes & intel->sarea->pf_active) == pf_planes;
 224
 225    if (INTEL_DEBUG & DEBUG_LOCK)
 226       if (pf_active != intel_fb->pf_active)
 227          _mesa_printf("%s - Page flipping %sactive\n", __progname,
 228                       pf_active ? "" : "in");
 229
 230    if (pf_active) {
 231       /* Sync pages between planes if flipping on both at the same time */
 232       if (pf_planes == 0x3 && pf_planes != intel_fb->pf_planes &&
 233           (intel->sarea->pf_current_page & 0x3) !=
 234           (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
 235          drm_i915_flip_t flip;
 236
 237          if (intel_fb->pf_current_page ==
 238              (intel->sarea->pf_current_page & 0x3)) {
 239             /* XXX: This is ugly, but emitting two flips 'in a row' can cause
 240              * lockups for unknown reasons.
 241              */
 242             intel->sarea->pf_current_page =
 243                intel->sarea->pf_current_page & 0x3;
 244             intel->sarea->pf_current_page |=
 245                ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 246                 intel_fb->pf_num_pages) << 2;
 247
 248             flip.pipes = 0x2;
 249          } else {
 250             intel->sarea->pf_current_page =
 251                intel->sarea->pf_current_page & (0x3 << 2);
 252             intel->sarea->pf_current_page |=
 253                (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 254                intel_fb->pf_num_pages;
 255
 256             flip.pipes = 0x1;
 257          }
 258
 259          drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 260       }
 261
 262       intel_fb->pf_planes = pf_planes;
 263    }
 264
 265    intel_fb->pf_active = pf_active;
 266    intel_flip_renderbuffers(intel_fb);
 267    intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 268 }
 269
 270 /**
 271  * This will be called whenever the currently bound window is moved/resized.
 272  * XXX: actually, it seems to NOT be called when the window is only moved (BP).
 273  */
 274 void
 275 intelWindowMoved(struct intel_context *intel)
 276 {
 277    GLcontext *ctx = &intel->ctx;
 278    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 279    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 280
 281    if (!intel->ctx.DrawBuffer) {
 282       /* when would this happen? -BP */
 283       intelSetFrontClipRects(intel);
 284    }
 285    else if (intel->ctx.DrawBuffer->Name != 0) {
 286       /* drawing to user-created FBO - do nothing */
 287       /* Cliprects would be set from intelDrawBuffer() */
 288    }
 289    else {
 290       /* drawing to a window */
 291       switch (intel_fb->Base._ColorDrawBufferIndexes[0]) {
 292       case BUFFER_FRONT_LEFT:
 293          intelSetFrontClipRects(intel);
 294          break;
 295       case BUFFER_BACK_LEFT:
 296          intelSetBackClipRects(intel);
 297          break;
 298       default:
 299          intelSetFrontClipRects(intel);
 300       }
 301
 302    }
 303
 304    if (!intel->intelScreen->driScrnPriv->dri2.enabled &&
 305        intel->intelScreen->driScrnPriv->ddx_version.minor >= 7) {
 306       volatile struct drm_i915_sarea *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       intelUpdatePageFlipping(intel, areaA, areaB);
 320
 321       /* Update vblank info
 322        */
 323       if (areaB > areaA || (areaA == areaB && areaB > 0)) {
 324          flags = dPriv->vblFlags | VBLANK_FLAG_SECONDARY;
 325       } else {
 326          flags = dPriv->vblFlags & ~VBLANK_FLAG_SECONDARY;
 327       }
 328
 329       /* Check to see if we changed pipes */
 330       if (flags != dPriv->vblFlags && dPriv->vblFlags &&
 331           !(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ)) {
 332          int64_t count;
 333          drmVBlank vbl;
 334          int i;
 335
 336          /*
 337           * Deal with page flipping
 338           */
 339          vbl.request.type = DRM_VBLANK_ABSOLUTE;
 340
 341          if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 342             vbl.request.type |= DRM_VBLANK_SECONDARY;
 343          }
 344
 345          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 346             if (!intel_fb->color_rb[i] ||
 347                 (intel_fb->vbl_waited - intel_fb->color_rb[i]->vbl_pending) <=
 348                 (1<<23))
 349                continue;
 350
 351             vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
 352             drmWaitVBlank(intel->driFd, &vbl);
 353          }
 354
 355          /*
 356           * Update msc_base from old pipe
 357           */
 358          driDrawableGetMSC32(dPriv->driScreenPriv, dPriv, &count);
 359          dPriv->msc_base = count;
 360          /*
 361           * Then get new vblank_base and vblSeq values
 362           */
 363          dPriv->vblFlags = flags;
 364          driGetCurrentVBlank(dPriv);
 365          dPriv->vblank_base = dPriv->vblSeq;
 366
 367          intel_fb->vbl_waited = dPriv->vblSeq;
 368
 369          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 370             if (intel_fb->color_rb[i])
 371                intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_waited;
 372          }
 373       }
 374    } else {
 375       dPriv->vblFlags &= ~VBLANK_FLAG_SECONDARY;
 376    }
 377
 378    /* Update Mesa's notion of window size */
 379    driUpdateFramebufferSize(ctx, dPriv);
 380    intel_fb->Base.Initialized = GL_TRUE; /* XXX remove someday */
 381
 382    /* Update hardware scissor */
 383    if (ctx->Driver.Scissor != NULL) {
 384       ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 385                           ctx->Scissor.Width, ctx->Scissor.Height);
 386    }
 387
 388    /* Re-calculate viewport related state */
 389    if (ctx->Driver.DepthRange != NULL)
 390       ctx->Driver.DepthRange( ctx, ctx->Viewport.Near, ctx->Viewport.Far );
 391 }
 392
 393
 394
 395 /* A true meta version of this would be very simple and additionally
 396  * machine independent.  Maybe we'll get there one day.
 397  */
 398 static void
 399 intelClearWithTris(struct intel_context *intel, GLbitfield mask)
 400 {
 401    GLcontext *ctx = &intel->ctx;
 402    struct gl_framebuffer *fb = ctx->DrawBuffer;
 403    GLuint buf;
 404
 405    intel->vtbl.install_meta_state(intel);
 406
 407    /* Back and stencil cliprects are the same.  Try and do both
 408     * buffers at once:
 409     */
 410    if (mask & (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) {
 411       struct intel_region *backRegion =
 412          intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 413       struct intel_region *depthRegion =
 414          intel_get_rb_region(fb, BUFFER_DEPTH);
 415
 416       intel->vtbl.meta_draw_region(intel, backRegion, depthRegion);
 417
 418       if (mask & BUFFER_BIT_BACK_LEFT)
 419          intel->vtbl.meta_color_mask(intel, GL_TRUE);
 420       else
 421          intel->vtbl.meta_color_mask(intel, GL_FALSE);
 422
 423       if (mask & BUFFER_BIT_STENCIL)
 424          intel->vtbl.meta_stencil_replace(intel,
 425                                           intel->ctx.Stencil.WriteMask[0],
 426                                           intel->ctx.Stencil.Clear);
 427       else
 428          intel->vtbl.meta_no_stencil_write(intel);
 429
 430       if (mask & BUFFER_BIT_DEPTH)
 431          intel->vtbl.meta_depth_replace(intel);
 432       else
 433          intel->vtbl.meta_no_depth_write(intel);
 434
 435       intel->vtbl.meta_draw_quad(intel,
 436                                  fb->_Xmin,
 437                                  fb->_Xmax,
 438                                  fb->_Ymin,
 439                                  fb->_Ymax,
 440                                  intel->ctx.Depth.Clear,
 441                                  intel->ClearColor8888,
 442                                  0, 0, 0, 0);   /* texcoords */
 443
 444       mask &= ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH);
 445    }
 446
 447    /* clear the remaining (color) renderbuffers */
 448    for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
 449       const GLuint bufBit = 1 << buf;
 450       if (mask & bufBit) {
 451          struct intel_renderbuffer *irbColor =
 452             intel_renderbuffer(fb->Attachment[buf].Renderbuffer);
 453
 454          ASSERT(irbColor);
 455
 456          intel->vtbl.meta_no_depth_write(intel);
 457          intel->vtbl.meta_no_stencil_write(intel);
 458          intel->vtbl.meta_color_mask(intel, GL_TRUE);
 459          intel->vtbl.meta_draw_region(intel, irbColor->region, NULL);
 460
 461          intel->vtbl.meta_draw_quad(intel,
 462                                     fb->_Xmin,
 463                                     fb->_Xmax,
 464                                     fb->_Ymin,
 465                                     fb->_Ymax,
 466                                     0, intel->ClearColor8888,
 467                                     0, 0, 0, 0);   /* texcoords */
 468
 469          mask &= ~bufBit;
 470       }
 471    }
 472
 473    intel->vtbl.leave_meta_state(intel);
 474 }
 475
 476 static const char *buffer_names[] = {
 477    [BUFFER_FRONT_LEFT] = "front",
 478    [BUFFER_BACK_LEFT] = "back",
 479    [BUFFER_FRONT_RIGHT] = "front right",
 480    [BUFFER_BACK_RIGHT] = "back right",
 481    [BUFFER_AUX0] = "aux0",
 482    [BUFFER_AUX1] = "aux1",
 483    [BUFFER_AUX2] = "aux2",
 484    [BUFFER_AUX3] = "aux3",
 485    [BUFFER_DEPTH] = "depth",
 486    [BUFFER_STENCIL] = "stencil",
 487    [BUFFER_ACCUM] = "accum",
 488    [BUFFER_COLOR0] = "color0",
 489    [BUFFER_COLOR1] = "color1",
 490    [BUFFER_COLOR2] = "color2",
 491    [BUFFER_COLOR3] = "color3",
 492    [BUFFER_COLOR4] = "color4",
 493    [BUFFER_COLOR5] = "color5",
 494    [BUFFER_COLOR6] = "color6",
 495    [BUFFER_COLOR7] = "color7",
 496 };
 497
 498 /**
 499  * Called by ctx->Driver.Clear.
 500  */
 501 static void
 502 intelClear(GLcontext *ctx, GLbitfield mask)
 503 {
 504    struct intel_context *intel = intel_context(ctx);
 505    const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
 506    GLbitfield tri_mask = 0;
 507    GLbitfield blit_mask = 0;
 508    GLbitfield swrast_mask = 0;
 509    struct gl_framebuffer *fb = ctx->DrawBuffer;
 510    GLuint i;
 511
 512    if (0)
 513       fprintf(stderr, "%s\n", __FUNCTION__);
 514
 515    /* HW color buffers (front, back, aux, generic FBO, etc) */
 516    if (colorMask == ~0) {
 517       /* clear all R,G,B,A */
 518       /* XXX FBO: need to check if colorbuffers are software RBOs! */
 519       blit_mask |= (mask & BUFFER_BITS_COLOR);
 520    }
 521    else {
 522       /* glColorMask in effect */
 523       tri_mask |= (mask & BUFFER_BITS_COLOR);
 524    }
 525
 526    /* HW stencil */
 527    if (mask & BUFFER_BIT_STENCIL) {
 528       const struct intel_region *stencilRegion
 529          = intel_get_rb_region(fb, BUFFER_STENCIL);
 530       if (stencilRegion) {
 531          /* have hw stencil */
 532          if (IS_965(intel->intelScreen->deviceID) ||
 533              (ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 534             /* We have to use the 3D engine if we're clearing a partial mask
 535              * of the stencil buffer, or if we're on a 965 which has a tiled
 536              * depth/stencil buffer in a layout we can't blit to.
 537              */
 538             tri_mask |= BUFFER_BIT_STENCIL;
 539          }
 540          else {
 541             /* clearing all stencil bits, use blitting */
 542             blit_mask |= BUFFER_BIT_STENCIL;
 543          }
 544       }
 545    }
 546
 547    /* HW depth */
 548    if (mask & BUFFER_BIT_DEPTH) {
 549       /* clear depth with whatever method is used for stencil (see above) */
 550       if (IS_965(intel->intelScreen->deviceID) ||
 551           tri_mask & BUFFER_BIT_STENCIL)
 552          tri_mask |= BUFFER_BIT_DEPTH;
 553       else
 554          blit_mask |= BUFFER_BIT_DEPTH;
 555    }
 556
 557    /* SW fallback clearing */
 558    swrast_mask = mask & ~tri_mask & ~blit_mask;
 559
 560    for (i = 0; i < BUFFER_COUNT; i++) {
 561       GLuint bufBit = 1 << i;
 562       if ((blit_mask | tri_mask) & bufBit) {
 563          if (!fb->Attachment[i].Renderbuffer->ClassID) {
 564             blit_mask &= ~bufBit;
 565             tri_mask &= ~bufBit;
 566             swrast_mask |= bufBit;
 567          }
 568       }
 569    }
 570
 571    if (blit_mask) {
 572       if (INTEL_DEBUG & DEBUG_BLIT) {
 573          DBG("blit clear:");
 574          for (i = 0; i < BUFFER_COUNT; i++) {
 575             if (blit_mask & (1 << i))
 576                DBG(" %s", buffer_names[i]);
 577          }
 578          DBG("\n");
 579       }
 580       intelClearWithBlit(ctx, blit_mask);
 581    }
 582
 583    if (tri_mask) {
 584       if (INTEL_DEBUG & DEBUG_BLIT) {
 585          DBG("tri clear:");
 586          for (i = 0; i < BUFFER_COUNT; i++) {
 587             if (tri_mask & (1 << i))
 588                DBG(" %s", buffer_names[i]);
 589          }
 590          DBG("\n");
 591       }
 592       intelClearWithTris(intel, tri_mask);
 593    }
 594
 595    if (swrast_mask) {
 596       if (INTEL_DEBUG & DEBUG_BLIT) {
 597          DBG("swrast clear:");
 598          for (i = 0; i < BUFFER_COUNT; i++) {
 599             if (swrast_mask & (1 << i))
 600                DBG(" %s", buffer_names[i]);
 601          }
 602          DBG("\n");
 603       }
 604       _swrast_Clear(ctx, swrast_mask);
 605    }
 606 }
 607
 608
 609 /* Emit wait for pending flips */
 610 void
 611 intel_wait_flips(struct intel_context *intel)
 612 {
 613    struct intel_framebuffer *intel_fb =
 614       (struct intel_framebuffer *) intel->ctx.DrawBuffer;
 615    struct intel_renderbuffer *intel_rb =
 616       intel_get_renderbuffer(&intel_fb->Base,
 617                              intel_fb->Base._ColorDrawBufferIndexes[0] ==
 618                              BUFFER_FRONT_LEFT ? BUFFER_FRONT_LEFT :
 619                              BUFFER_BACK_LEFT);
 620
 621    if (intel_fb->Base.Name == 0 && intel_rb &&
 622        intel_rb->pf_pending == intel_fb->pf_seq) {
 623       GLint pf_planes = intel_fb->pf_planes;
 624       BATCH_LOCALS;
 625
 626       /* Wait for pending flips to take effect */
 627       BEGIN_BATCH(2, NO_LOOP_CLIPRECTS);
 628       OUT_BATCH(pf_planes & 0x1 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_A_FLIP)
 629                 : 0);
 630       OUT_BATCH(pf_planes & 0x2 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_B_FLIP)
 631                 : 0);
 632       ADVANCE_BATCH();
 633
 634       intel_rb->pf_pending--;
 635    }
 636 }
 637
 638
 639 /* Flip the front & back buffers
 640  */
 641 static GLboolean
 642 intelPageFlip(const __DRIdrawablePrivate * dPriv)
 643 {
 644    struct intel_context *intel;
 645    int ret;
 646    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 647
 648    if (INTEL_DEBUG & DEBUG_IOCTL)
 649       fprintf(stderr, "%s\n", __FUNCTION__);
 650
 651    assert(dPriv);
 652    assert(dPriv->driContextPriv);
 653    assert(dPriv->driContextPriv->driverPrivate);
 654
 655    intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 656
 657    if (intel->intelScreen->drmMinor < 9)
 658       return GL_FALSE;
 659
 660    intelFlush(&intel->ctx);
 661
 662    ret = 0;
 663
 664    LOCK_HARDWARE(intel);
 665
 666    if (dPriv->numClipRects && intel_fb->pf_active) {
 667       drm_i915_flip_t flip;
 668
 669       flip.pipes = intel_fb->pf_planes;
 670
 671       ret = drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 672    }
 673
 674    UNLOCK_HARDWARE(intel);
 675
 676    if (ret || !intel_fb->pf_active)
 677       return GL_FALSE;
 678
 679    if (!dPriv->numClipRects) {
 680       usleep(10000);    /* throttle invisible client 10ms */
 681    }
 682
 683    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 684                                 (intel_fb->pf_planes & 0x2)) & 0x3;
 685
 686    if (dPriv->numClipRects != 0) {
 687       intel_get_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT)->pf_pending =
 688       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->pf_pending =
 689          ++intel_fb->pf_seq;
 690    }
 691
 692    intel_flip_renderbuffers(intel_fb);
 693    intel_draw_buffer(&intel->ctx, &intel_fb->Base);
 694
 695    return GL_TRUE;
 696 }
 697
 698 static GLboolean
 699 intelScheduleSwap(__DRIdrawablePrivate * dPriv, GLboolean *missed_target)
 700 {
 701    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 702    unsigned int interval;
 703    struct intel_context *intel =
 704       intelScreenContext(dPriv->driScreenPriv->private);
 705    const intelScreenPrivate *intelScreen = intel->intelScreen;
 706    unsigned int target;
 707    drm_i915_vblank_swap_t swap;
 708    GLboolean ret;
 709
 710    if (!dPriv->vblFlags ||
 711        (dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) ||
 712        intelScreen->drmMinor < (intel_fb->pf_active ? 9 : 6))
 713       return GL_FALSE;
 714
 715    interval = driGetVBlankInterval(dPriv);
 716
 717    swap.seqtype = DRM_VBLANK_ABSOLUTE;
 718
 719    if (dPriv->vblFlags & VBLANK_FLAG_SYNC) {
 720       swap.seqtype |= DRM_VBLANK_NEXTONMISS;
 721    } else if (interval == 0)
 722       return GL_FALSE;
 723
 724    swap.drawable = dPriv->hHWDrawable;
 725    target = swap.sequence = dPriv->vblSeq + interval;
 726
 727    if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 728       swap.seqtype |= DRM_VBLANK_SECONDARY;
 729    }
 730
 731    LOCK_HARDWARE(intel);
 732
 733    intel_batchbuffer_flush(intel->batch);
 734
 735    if ( intel_fb->pf_active ) {
 736       swap.seqtype |= DRM_VBLANK_FLIP;
 737
 738       intel_fb->pf_current_page = (((intel->sarea->pf_current_page >>
 739                                      (intel_fb->pf_planes & 0x2)) & 0x3) + 1) %
 740                                   intel_fb->pf_num_pages;
 741    }
 742
 743    if (!drmCommandWriteRead(intel->driFd, DRM_I915_VBLANK_SWAP, &swap,
 744                             sizeof(swap))) {
 745       dPriv->vblSeq = swap.sequence;
 746       swap.sequence -= target;
 747       *missed_target = swap.sequence > 0 && swap.sequence <= (1 << 23);
 748
 749       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->vbl_pending =
 750          intel_get_renderbuffer(&intel_fb->Base,
 751                                 BUFFER_FRONT_LEFT)->vbl_pending =
 752          dPriv->vblSeq;
 753
 754       if (swap.seqtype & DRM_VBLANK_FLIP) {
 755          intel_flip_renderbuffers(intel_fb);
 756          intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 757       }
 758
 759       ret = GL_TRUE;
 760    } else {
 761       if (swap.seqtype & DRM_VBLANK_FLIP) {
 762          intel_fb->pf_current_page = ((intel->sarea->pf_current_page >>
 763                                         (intel_fb->pf_planes & 0x2)) & 0x3) %
 764                                      intel_fb->pf_num_pages;
 765       }
 766
 767       ret = GL_FALSE;
 768    }
 769
 770    UNLOCK_HARDWARE(intel);
 771
 772    return ret;
 773 }
 774
 775 void
 776 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 777 {
 778    __DRIscreenPrivate *psp = dPriv->driScreenPriv;
 779
 780    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 781       GET_CURRENT_CONTEXT(ctx);
 782       struct intel_context *intel;
 783
 784       if (ctx == NULL)
 785          return;
 786
 787       intel = intel_context(ctx);
 788
 789       if (ctx->Visual.doubleBufferMode) {
 790          GLboolean missed_target;
 791          struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 792          int64_t ust;
 793
 794          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 795
 796          if (!intelScheduleSwap(dPriv, &missed_target)) {
 797             driWaitForVBlank(dPriv, &missed_target);
 798
 799             /*
 800              * Update each buffer's vbl_pending so we don't get too out of
 801              * sync
 802              */
 803             intel_get_renderbuffer(&intel_fb->Base,
 804                                    BUFFER_BACK_LEFT)->vbl_pending =
 805                     intel_get_renderbuffer(&intel_fb->Base,
 806                                            BUFFER_FRONT_LEFT)->vbl_pending =
 807                     dPriv->vblSeq;
 808             if (!intelPageFlip(dPriv)) {
 809                intelCopyBuffer(dPriv, NULL);
 810             }
 811          }
 812
 813          intel_fb->swap_count++;
 814          (*psp->systemTime->getUST) (&ust);
 815          if (missed_target) {
 816             intel_fb->swap_missed_count++;
 817             intel_fb->swap_missed_ust = ust - intel_fb->swap_ust;
 818          }
 819
 820          intel_fb->swap_ust = ust;
 821       }
 822       drmCommandNone(intel->driFd, DRM_I915_GEM_THROTTLE);
 823
 824    }
 825    else {
 826       /* XXX this shouldn't be an error but we can't handle it for now */
 827       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 828    }
 829 }
 830
 831 void
 832 intelCopySubBuffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h)
 833 {
 834    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 835       struct intel_context *intel =
 836          (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 837       GLcontext *ctx = &intel->ctx;
 838
 839       if (ctx->Visual.doubleBufferMode) {
 840          drm_clip_rect_t rect;
 841          rect.x1 = x + dPriv->x;
 842          rect.y1 = (dPriv->h - y - h) + dPriv->y;
 843          rect.x2 = rect.x1 + w;
 844          rect.y2 = rect.y1 + h;
 845          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 846          intelCopyBuffer(dPriv, &rect);
 847       }
 848    }
 849    else {
 850       /* XXX this shouldn't be an error but we can't handle it for now */
 851       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 852    }
 853 }
 854
 855
 856 /**
 857  * Update the hardware state for drawing into a window or framebuffer object.
 858  *
 859  * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 860  * places within the driver.
 861  *
 862  * Basically, this needs to be called any time the current framebuffer
 863  * changes, the renderbuffers change, or we need to draw into different
 864  * color buffers.
 865  */
 866 void
 867 intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 868 {
 869    struct intel_context *intel = intel_context(ctx);
 870    struct intel_region *colorRegions[MAX_DRAW_BUFFERS], *depthRegion = NULL;
 871    struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
 872    int front = 0;               /* drawing to front color buffer? */
 873
 874    if (!fb) {
 875       /* this can happen during the initial context initialization */
 876       return;
 877    }
 878
 879    /* Do this here, note core Mesa, since this function is called from
 880     * many places within the driver.
 881     */
 882    if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
 883       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
 884       _mesa_update_framebuffer(ctx);
 885       /* this updates the DrawBuffer's Width/Height if it's a FBO */
 886       _mesa_update_draw_buffer_bounds(ctx);
 887    }
 888
 889    if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 890       /* this may occur when we're called by glBindFrameBuffer() during
 891        * the process of someone setting up renderbuffers, etc.
 892        */
 893       /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
 894       return;
 895    }
 896
 897    if (fb->Name)
 898       intel_validate_paired_depth_stencil(ctx, fb);
 899
 900    /* If the batch contents require looping over cliprects, flush them before
 901     * we go changing which cliprects get referenced when that happens.
 902     */
 903    if (intel->batch->cliprect_mode == LOOP_CLIPRECTS)
 904       intel_batchbuffer_flush(intel->batch);
 905
 906    /*
 907     * How many color buffers are we drawing into?
 908     */
 909    if (fb->_NumColorDrawBuffers == 0) {
 910       /* writing to 0  */
 911       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 912       colorRegions[0] = NULL;
 913
 914       if (fb->Name != 0)
 915          intelSetRenderbufferClipRects(intel);
 916    } else if (fb->_NumColorDrawBuffers > 1) {
 917        int i;
 918        struct intel_renderbuffer *irb;
 919        FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 920
 921        if (fb->Name != 0)
 922            intelSetRenderbufferClipRects(intel);
 923        for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
 924            irb = intel_renderbuffer(fb->_ColorDrawBuffers[i]);
 925            colorRegions[i] = (irb && irb->region) ? irb->region : NULL;
 926        }
 927    }
 928    else {
 929       /* draw to exactly one color buffer */
 930       /*_mesa_debug(ctx, "Hardware rendering\n");*/
 931       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 932       if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
 933          front = 1;
 934       }
 935
 936       /*
 937        * Get the intel_renderbuffer for the colorbuffer we're drawing into.
 938        * And set up cliprects.
 939        */
 940       if (fb->Name == 0) {
 941          /* drawing to window system buffer */
 942          if (front) {
 943             intelSetFrontClipRects(intel);
 944             colorRegions[0] = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
 945          }
 946          else {
 947             intelSetBackClipRects(intel);
 948             colorRegions[0]= intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 949          }
 950       }
 951       else {
 952          /* drawing to user-created FBO */
 953          struct intel_renderbuffer *irb;
 954          intelSetRenderbufferClipRects(intel);
 955          irb = intel_renderbuffer(fb->_ColorDrawBuffers[0]);
 956          colorRegions[0] = (irb && irb->region) ? irb->region : NULL;
 957       }
 958    }
 959
 960    /* Update culling direction which changes depending on the
 961     * orientation of the buffer:
 962     */
 963    if (ctx->Driver.FrontFace)
 964       ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 965    else
 966       ctx->NewState |= _NEW_POLYGON;
 967
 968    if (!colorRegions[0]) {
 969       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 970    }
 971    else {
 972       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 973    }
 974
 975    /***
 976     *** Get depth buffer region and check if we need a software fallback.
 977     *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
 978     ***/
 979    if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
 980       irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
 981       if (irbDepth && irbDepth->region) {
 982          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 983          depthRegion = irbDepth->region;
 984       }
 985       else {
 986          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
 987          depthRegion = NULL;
 988       }
 989    }
 990    else {
 991       /* not using depth buffer */
 992       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 993       depthRegion = NULL;
 994    }
 995
 996    /***
 997     *** Stencil buffer
 998     *** This can only be hardware accelerated if we're using a
 999     *** combined DEPTH_STENCIL buffer (for now anyway).
1000     ***/
1001    if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
1002       irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
1003       if (irbStencil && irbStencil->region) {
1004          ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
1005          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
1006          /* need to re-compute stencil hw state */
1007          if (ctx->Driver.Enable != NULL)
1008             ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
1009          else
1010             ctx->NewState |= _NEW_STENCIL;
1011          if (!depthRegion)
1012             depthRegion = irbStencil->region;
1013       }
1014       else {
1015          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
1016       }
1017    }
1018    else {
1019       /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
1020       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
1021       /* need to re-compute stencil hw state */
1022       if (ctx->Driver.Enable != NULL)
1023          ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
1024       else
1025          ctx->NewState |= _NEW_STENCIL;
1026    }
1027
1028    /*
1029     * Update depth test state
1030     */
1031    if (ctx->Driver.Enable) {
1032       if (ctx->Depth.Test && fb->Visual.depthBits > 0) {
1033          ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_TRUE);
1034       } else {
1035          ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_FALSE);
1036       }
1037    } else {
1038       ctx->NewState |= _NEW_DEPTH;
1039    }
1040
1041    intel->vtbl.set_draw_region(intel, colorRegions, depthRegion,
1042         fb->_NumColorDrawBuffers);
1043
1044    /* update viewport since it depends on window size */
1045    if (ctx->Driver.Viewport) {
1046       ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y,
1047                            ctx->Viewport.Width, ctx->Viewport.Height);
1048    } else {
1049       ctx->NewState |= _NEW_VIEWPORT;
1050    }
1051
1052    /* Set state we know depends on drawable parameters:
1053     */
1054    if (ctx->Driver.Scissor)
1055       ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
1056                           ctx->Scissor.Width, ctx->Scissor.Height);
1057    intel->NewGLState |= _NEW_SCISSOR;
1058
1059    if (ctx->Driver.DepthRange)
1060       ctx->Driver.DepthRange(ctx,
1061                              ctx->Viewport.Near,
1062                              ctx->Viewport.Far);
1063 }
1064
1065
1066 static void
1067 intelDrawBuffer(GLcontext * ctx, GLenum mode)
1068 {
1069    intel_draw_buffer(ctx, ctx->DrawBuffer);
1070 }
1071
1072
1073 static void
1074 intelReadBuffer(GLcontext * ctx, GLenum mode)
1075 {
1076    if (ctx->ReadBuffer == ctx->DrawBuffer) {
1077       /* This will update FBO completeness status.
1078        * A framebuffer will be incomplete if the GL_READ_BUFFER setting
1079        * refers to a missing renderbuffer.  Calling glReadBuffer can set
1080        * that straight and can make the drawing buffer complete.
1081        */
1082       intel_draw_buffer(ctx, ctx->DrawBuffer);
1083    }
1084    /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
1085     * reference ctx->ReadBuffer and do appropriate state checks.
1086     */
1087 }
1088
1089
1090 void
1091 intelInitBufferFuncs(struct dd_function_table *functions)
1092 {
1093    functions->Clear = intelClear;
1094    functions->DrawBuffer = intelDrawBuffer;
1095    functions->ReadBuffer = intelReadBuffer;
1096 }