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_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_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
  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 to a user-created FBO:
 129  *   intel->numClipRects
 130  *   intel->pClipRects
 131  *   intel->drawX
 132  *   intel->drawY
 133  */
 134 static void
 135 intelSetRenderbufferClipRects(struct intel_context *intel)
 136 {
 137    assert(intel->ctx.DrawBuffer->Width > 0);
 138    assert(intel->ctx.DrawBuffer->Height > 0);
 139    intel->fboRect.x1 = 0;
 140    intel->fboRect.y1 = 0;
 141    intel->fboRect.x2 = intel->ctx.DrawBuffer->Width;
 142    intel->fboRect.y2 = intel->ctx.DrawBuffer->Height;
 143    intel->numClipRects = 1;
 144    intel->pClipRects = &intel->fboRect;
 145    intel->drawX = 0;
 146    intel->drawY = 0;
 147 }
 148
 149
 150 /**
 151  * As above, but for rendering to front buffer of a window.
 152  * \sa intelSetRenderbufferClipRects
 153  */
 154 static void
 155 intelSetFrontClipRects(struct intel_context *intel)
 156 {
 157    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 158
 159    if (!dPriv)
 160       return;
 161
 162    intel->numClipRects = dPriv->numClipRects;
 163    intel->pClipRects = dPriv->pClipRects;
 164    intel->drawX = dPriv->x;
 165    intel->drawY = dPriv->y;
 166 }
 167
 168
 169 /**
 170  * As above, but for rendering to back buffer of a window.
 171  */
 172 static void
 173 intelSetBackClipRects(struct intel_context *intel)
 174 {
 175    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 176    struct intel_framebuffer *intel_fb;
 177
 178    if (!dPriv)
 179       return;
 180
 181    intel_fb = dPriv->driverPrivate;
 182
 183    if (intel_fb->pf_active || dPriv->numBackClipRects == 0) {
 184       /* use the front clip rects */
 185       intel->numClipRects = dPriv->numClipRects;
 186       intel->pClipRects = dPriv->pClipRects;
 187       intel->drawX = dPriv->x;
 188       intel->drawY = dPriv->y;
 189    }
 190    else {
 191       /* use the back clip rects */
 192       intel->numClipRects = dPriv->numBackClipRects;
 193       intel->pClipRects = dPriv->pBackClipRects;
 194       intel->drawX = dPriv->backX;
 195       intel->drawY = dPriv->backY;
 196    }
 197 }
 198
 199
 200 /**
 201  * This will be called whenever the currently bound window is moved/resized.
 202  * XXX: actually, it seems to NOT be called when the window is only moved (BP).
 203  */
 204 void
 205 intelWindowMoved(struct intel_context *intel)
 206 {
 207    GLcontext *ctx = &intel->ctx;
 208    __DRIdrawablePrivate *dPriv = intel->driDrawable;
 209    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 210
 211    if (!intel->ctx.DrawBuffer) {
 212       /* when would this happen? -BP */
 213       intelSetFrontClipRects(intel);
 214    }
 215    else if (intel->ctx.DrawBuffer->Name != 0) {
 216       /* drawing to user-created FBO - do nothing */
 217       /* Cliprects would be set from intelDrawBuffer() */
 218    }
 219    else {
 220       /* drawing to a window */
 221       switch (intel_fb->Base._ColorDrawBufferMask[0]) {
 222       case BUFFER_BIT_FRONT_LEFT:
 223          intelSetFrontClipRects(intel);
 224          break;
 225       case BUFFER_BIT_BACK_LEFT:
 226          intelSetBackClipRects(intel);
 227          break;
 228       default:
 229          /* glDrawBuffer(GL_NONE or GL_FRONT_AND_BACK): software fallback */
 230          intelSetFrontClipRects(intel);
 231       }
 232    }
 233
 234    if (intel->intelScreen->driScrnPriv->ddx_version.minor >= 7) {
 235       drmI830Sarea *sarea = intel->sarea;
 236       drm_clip_rect_t drw_rect = { .x1 = dPriv->x, .x2 = dPriv->x + dPriv->w,
 237                                    .y1 = dPriv->y, .y2 = dPriv->y + dPriv->h };
 238       drm_clip_rect_t planeA_rect = { .x1 = sarea->planeA_x, .y1 = sarea->planeA_y,
 239                                      .x2 = sarea->planeA_x + sarea->planeA_w,
 240                                      .y2 = sarea->planeA_y + sarea->planeA_h };
 241       drm_clip_rect_t planeB_rect = { .x1 = sarea->planeB_x, .y1 = sarea->planeB_y,
 242                                      .x2 = sarea->planeB_x + sarea->planeB_w,
 243                                      .y2 = sarea->planeB_y + sarea->planeB_h };
 244       GLint areaA = driIntersectArea( drw_rect, planeA_rect );
 245       GLint areaB = driIntersectArea( drw_rect, planeB_rect );
 246       GLuint flags = dPriv->vblFlags;
 247       GLboolean pf_active;
 248       GLint pf_planes;
 249
 250       /* Update page flipping info
 251        */
 252       pf_planes = 0;
 253
 254       if (areaA > 0)
 255          pf_planes |= 1;
 256
 257       if (areaB > 0)
 258          pf_planes |= 2;
 259
 260       intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 261                                    (intel_fb->pf_planes & 0x2)) & 0x3;
 262
 263       intel_fb->pf_num_pages = intel->intelScreen->third.handle ? 3 : 2;
 264
 265       pf_active = pf_planes && (pf_planes & intel->sarea->pf_active) == pf_planes;
 266
 267       if (INTEL_DEBUG & DEBUG_LOCK)
 268          if (pf_active != intel_fb->pf_active)
 269             _mesa_printf("%s - Page flipping %sactive\n", __progname,
 270                          pf_active ? "" : "in");
 271
 272       if (pf_active) {
 273          /* Sync pages between planes if flipping on both at the same time */
 274          if (pf_planes == 0x3 && pf_planes != intel_fb->pf_planes &&
 275              (intel->sarea->pf_current_page & 0x3) !=
 276              (((intel->sarea->pf_current_page) >> 2) & 0x3)) {
 277             drm_i915_flip_t flip;
 278
 279             if (intel_fb->pf_current_page ==
 280                 (intel->sarea->pf_current_page & 0x3)) {
 281                /* XXX: This is ugly, but emitting two flips 'in a row' can cause
 282                 * lockups for unknown reasons.
 283                 */
 284                intel->sarea->pf_current_page =
 285                   intel->sarea->pf_current_page & 0x3;
 286                intel->sarea->pf_current_page |=
 287                   ((intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 288                    intel_fb->pf_num_pages) << 2;
 289
 290                flip.pipes = 0x2;
 291             } else {
 292                intel->sarea->pf_current_page =
 293                   intel->sarea->pf_current_page & (0x3 << 2);
 294                intel->sarea->pf_current_page |=
 295                   (intel_fb->pf_current_page + intel_fb->pf_num_pages - 1) %
 296                   intel_fb->pf_num_pages;
 297
 298                flip.pipes = 0x1;
 299             }
 300
 301             drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 302          }
 303
 304          intel_fb->pf_planes = pf_planes;
 305       }
 306
 307       intel_fb->pf_active = pf_active;
 308       intel_flip_renderbuffers(intel_fb);
 309       intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 310
 311       /* Update vblank info
 312        */
 313       if (areaB > areaA || (areaA == areaB && areaB > 0)) {
 314          flags = dPriv->vblFlags | VBLANK_FLAG_SECONDARY;
 315       } else {
 316          flags = dPriv->vblFlags & ~VBLANK_FLAG_SECONDARY;
 317       }
 318
 319       /* Check to see if we changed pipes */
 320       if (flags != dPriv->vblFlags && dPriv->vblFlags &&
 321           !(dPriv->vblFlags & VBLANK_FLAG_NO_IRQ)) {
 322          int64_t count;
 323          drmVBlank vbl;
 324          int i;
 325
 326          /*
 327           * Deal with page flipping
 328           */
 329          vbl.request.type = DRM_VBLANK_ABSOLUTE;
 330
 331          if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 332             vbl.request.type |= DRM_VBLANK_SECONDARY;
 333          }
 334
 335          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 336             if (!intel_fb->color_rb[i] ||
 337                 (intel_fb->vbl_waited - intel_fb->color_rb[i]->vbl_pending) <=
 338                 (1<<23))
 339                continue;
 340
 341             vbl.request.sequence = intel_fb->color_rb[i]->vbl_pending;
 342             drmWaitVBlank(intel->driFd, &vbl);
 343          }
 344
 345          /*
 346           * Update msc_base from old pipe
 347           */
 348          driDrawableGetMSC32(dPriv->driScreenPriv, dPriv, &count);
 349          dPriv->msc_base = count;
 350          /*
 351           * Then get new vblank_base and vblSeq values
 352           */
 353          dPriv->vblFlags = flags;
 354          driGetCurrentVBlank(dPriv);
 355          dPriv->vblank_base = dPriv->vblSeq;
 356
 357          intel_fb->vbl_waited = dPriv->vblSeq;
 358
 359          for (i = 0; i < intel_fb->pf_num_pages; i++) {
 360             if (intel_fb->color_rb[i])
 361                intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_waited;
 362          }
 363       }
 364    } else {
 365       dPriv->vblFlags &= ~VBLANK_FLAG_SECONDARY;
 366    }
 367
 368    /* Update Mesa's notion of window size */
 369    driUpdateFramebufferSize(ctx, dPriv);
 370    intel_fb->Base.Initialized = GL_TRUE; /* XXX remove someday */
 371
 372    /* Update hardware scissor */
 373    ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
 374                        ctx->Scissor.Width, ctx->Scissor.Height);
 375
 376    /* Re-calculate viewport related state */
 377    ctx->Driver.DepthRange( ctx, ctx->Viewport.Near, ctx->Viewport.Far );
 378 }
 379
 380
 381
 382 /* A true meta version of this would be very simple and additionally
 383  * machine independent.  Maybe we'll get there one day.
 384  */
 385 static void
 386 intelClearWithTris(struct intel_context *intel, GLbitfield mask)
 387 {
 388    GLcontext *ctx = &intel->ctx;
 389    struct gl_framebuffer *fb = ctx->DrawBuffer;
 390    drm_clip_rect_t clear;
 391
 392    if (INTEL_DEBUG & DEBUG_BLIT)
 393       _mesa_printf("%s 0x%x\n", __FUNCTION__, mask);
 394
 395    LOCK_HARDWARE(intel);
 396
 397    /* XXX FBO: was: intel->driDrawable->numClipRects */
 398    if (intel->numClipRects) {
 399       GLint cx, cy, cw, ch;
 400       GLuint buf;
 401
 402       intel->vtbl.install_meta_state(intel);
 403
 404       /* Get clear bounds after locking */
 405       cx = fb->_Xmin;
 406       cy = fb->_Ymin;
 407       ch = fb->_Ymax - cx;
 408       cw = fb->_Xmax - cy;
 409
 410       /* note: regardless of 'all', cx, cy, cw, ch are now correct */
 411       clear.x1 = cx;
 412       clear.y1 = cy;
 413       clear.x2 = cx + cw;
 414       clear.y2 = cy + ch;
 415
 416       /* Back and stencil cliprects are the same.  Try and do both
 417        * buffers at once:
 418        */
 419       if (mask &
 420           (BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH)) {
 421          struct intel_region *backRegion =
 422             intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 423          struct intel_region *depthRegion =
 424             intel_get_rb_region(fb, BUFFER_DEPTH);
 425          const GLuint clearColor = (backRegion && backRegion->cpp == 4)
 426             ? intel->ClearColor8888 : intel->ClearColor565;
 427
 428          intel->vtbl.meta_draw_region(intel, backRegion, depthRegion);
 429
 430          if (mask & BUFFER_BIT_BACK_LEFT)
 431             intel->vtbl.meta_color_mask(intel, GL_TRUE);
 432          else
 433             intel->vtbl.meta_color_mask(intel, GL_FALSE);
 434
 435          if (mask & BUFFER_BIT_STENCIL)
 436             intel->vtbl.meta_stencil_replace(intel,
 437                                              intel->ctx.Stencil.WriteMask[0],
 438                                              intel->ctx.Stencil.Clear);
 439          else
 440             intel->vtbl.meta_no_stencil_write(intel);
 441
 442          if (mask & BUFFER_BIT_DEPTH)
 443             intel->vtbl.meta_depth_replace(intel);
 444          else
 445             intel->vtbl.meta_no_depth_write(intel);
 446
 447          /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the
 448           * drawing origin may not be correctly emitted.
 449           */
 450          intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2, intel->ctx.Depth.Clear, clearColor, 0, 0, 0, 0);   /* texcoords */
 451
 452          mask &=
 453             ~(BUFFER_BIT_BACK_LEFT | BUFFER_BIT_STENCIL | BUFFER_BIT_DEPTH);
 454       }
 455
 456       /* clear the remaining (color) renderbuffers */
 457       for (buf = 0; buf < BUFFER_COUNT && mask; buf++) {
 458          const GLuint bufBit = 1 << buf;
 459          if (mask & bufBit) {
 460             struct intel_renderbuffer *irbColor =
 461                intel_renderbuffer(fb->Attachment[buf].Renderbuffer);
 462             GLuint color = (irbColor->region->cpp == 4)
 463                ? intel->ClearColor8888 : intel->ClearColor565;
 464
 465             ASSERT(irbColor);
 466
 467             intel->vtbl.meta_no_depth_write(intel);
 468             intel->vtbl.meta_no_stencil_write(intel);
 469             intel->vtbl.meta_color_mask(intel, GL_TRUE);
 470             intel->vtbl.meta_draw_region(intel, irbColor->region, NULL);
 471
 472             /* XXX: Using INTEL_BATCH_NO_CLIPRECTS here is dangerous as the
 473              * drawing origin may not be correctly emitted.
 474              */
 475             intel_meta_draw_quad(intel, clear.x1, clear.x2, clear.y1, clear.y2, 0,      /* depth clear val */
 476                                  color, 0, 0, 0, 0);    /* texcoords */
 477
 478             mask &= ~bufBit;
 479          }
 480       }
 481
 482       intel->vtbl.leave_meta_state(intel);
 483       intel_batchbuffer_flush(intel->batch);
 484    }
 485    UNLOCK_HARDWARE(intel);
 486 }
 487
 488 /**
 489  * Called by ctx->Driver.Clear.
 490  */
 491 static void
 492 intelClear(GLcontext *ctx, GLbitfield mask)
 493 {
 494    struct intel_context *intel = intel_context(ctx);
 495    const GLuint colorMask = *((GLuint *) & ctx->Color.ColorMask);
 496    GLbitfield tri_mask = 0;
 497    GLbitfield blit_mask = 0;
 498    GLbitfield swrast_mask = 0;
 499    struct gl_framebuffer *fb = ctx->DrawBuffer;
 500    GLuint i;
 501
 502    if (0)
 503       fprintf(stderr, "%s\n", __FUNCTION__);
 504
 505    /* HW color buffers (front, back, aux, generic FBO, etc) */
 506    if (colorMask == ~0) {
 507       /* clear all R,G,B,A */
 508       /* XXX FBO: need to check if colorbuffers are software RBOs! */
 509       blit_mask |= (mask & BUFFER_BITS_COLOR);
 510    }
 511    else {
 512       /* glColorMask in effect */
 513       tri_mask |= (mask & BUFFER_BITS_COLOR);
 514    }
 515
 516    /* HW stencil */
 517    if (mask & BUFFER_BIT_STENCIL) {
 518       const struct intel_region *stencilRegion
 519          = intel_get_rb_region(fb, BUFFER_STENCIL);
 520       if (stencilRegion) {
 521          /* have hw stencil */
 522          if ((ctx->Stencil.WriteMask[0] & 0xff) != 0xff) {
 523             /* not clearing all stencil bits, so use triangle clearing */
 524             tri_mask |= BUFFER_BIT_STENCIL;
 525          }
 526          else {
 527             /* clearing all stencil bits, use blitting */
 528             blit_mask |= BUFFER_BIT_STENCIL;
 529          }
 530       }
 531    }
 532
 533    /* HW depth */
 534    if (mask & BUFFER_BIT_DEPTH) {
 535       /* clear depth with whatever method is used for stencil (see above) */
 536       if (tri_mask & BUFFER_BIT_STENCIL)
 537          tri_mask |= BUFFER_BIT_DEPTH;
 538       else
 539          blit_mask |= BUFFER_BIT_DEPTH;
 540    }
 541
 542    /* SW fallback clearing */
 543    swrast_mask = mask & ~tri_mask & ~blit_mask;
 544
 545    for (i = 0; i < BUFFER_COUNT; i++) {
 546       GLuint bufBit = 1 << i;
 547       if ((blit_mask | tri_mask) & bufBit) {
 548          if (!fb->Attachment[i].Renderbuffer->ClassID) {
 549             blit_mask &= ~bufBit;
 550             tri_mask &= ~bufBit;
 551             swrast_mask |= bufBit;
 552          }
 553       }
 554    }
 555
 556
 557    intelFlush(ctx);             /* XXX intelClearWithBlit also does this */
 558
 559    if (blit_mask)
 560       intelClearWithBlit(ctx, blit_mask);
 561
 562    if (tri_mask)
 563       intelClearWithTris(intel, tri_mask);
 564
 565    if (swrast_mask)
 566       _swrast_Clear(ctx, swrast_mask);
 567 }
 568
 569
 570 /* Emit wait for pending flips */
 571 void
 572 intel_wait_flips(struct intel_context *intel, GLuint batch_flags)
 573 {
 574    struct intel_framebuffer *intel_fb =
 575       (struct intel_framebuffer *) intel->ctx.DrawBuffer;
 576    struct intel_renderbuffer *intel_rb =
 577       intel_get_renderbuffer(&intel_fb->Base,
 578                              intel_fb->Base._ColorDrawBufferMask[0] ==
 579                              BUFFER_BIT_FRONT_LEFT ? BUFFER_FRONT_LEFT :
 580                              BUFFER_BACK_LEFT);
 581
 582    if (intel_fb->Base.Name == 0 && intel_rb->pf_pending == intel_fb->pf_seq) {
 583       GLint pf_planes = intel_fb->pf_planes;
 584       BATCH_LOCALS;
 585
 586       /* Wait for pending flips to take effect */
 587       BEGIN_BATCH(2, batch_flags);
 588       OUT_BATCH(pf_planes & 0x1 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_A_FLIP)
 589                 : 0);
 590       OUT_BATCH(pf_planes & 0x2 ? (MI_WAIT_FOR_EVENT | MI_WAIT_FOR_PLANE_B_FLIP)
 591                 : 0);
 592       ADVANCE_BATCH();
 593
 594       intel_rb->pf_pending--;
 595    }
 596 }
 597
 598
 599 /* Flip the front & back buffers
 600  */
 601 static GLboolean
 602 intelPageFlip(const __DRIdrawablePrivate * dPriv)
 603 {
 604    struct intel_context *intel;
 605    int ret;
 606    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 607
 608    if (INTEL_DEBUG & DEBUG_IOCTL)
 609       fprintf(stderr, "%s\n", __FUNCTION__);
 610
 611    assert(dPriv);
 612    assert(dPriv->driContextPriv);
 613    assert(dPriv->driContextPriv->driverPrivate);
 614
 615    intel = (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 616
 617    if (intel->intelScreen->drmMinor < 9)
 618       return GL_FALSE;
 619
 620    intelFlush(&intel->ctx);
 621
 622    ret = 0;
 623
 624    LOCK_HARDWARE(intel);
 625
 626    if (dPriv->numClipRects && intel_fb->pf_active) {
 627       drm_i915_flip_t flip;
 628
 629       flip.pipes = intel_fb->pf_planes;
 630
 631       ret = drmCommandWrite(intel->driFd, DRM_I915_FLIP, &flip, sizeof(flip));
 632    }
 633
 634    UNLOCK_HARDWARE(intel);
 635
 636    if (ret || !intel_fb->pf_active)
 637       return GL_FALSE;
 638
 639    if (!dPriv->numClipRects) {
 640       usleep(10000);    /* throttle invisible client 10ms */
 641    }
 642
 643    intel_fb->pf_current_page = (intel->sarea->pf_current_page >>
 644                                 (intel_fb->pf_planes & 0x2)) & 0x3;
 645
 646    if (dPriv->numClipRects != 0) {
 647       intel_get_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT)->pf_pending =
 648       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->pf_pending =
 649          ++intel_fb->pf_seq;
 650    }
 651
 652    intel_flip_renderbuffers(intel_fb);
 653    intel_draw_buffer(&intel->ctx, &intel_fb->Base);
 654
 655    return GL_TRUE;
 656 }
 657
 658 #if 0
 659 void
 660 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 661 {
 662    if (dPriv->driverPrivate) {
 663       const struct gl_framebuffer *fb
 664          = (struct gl_framebuffer *) dPriv->driverPrivate;
 665       if (fb->Visual.doubleBufferMode) {
 666          GET_CURRENT_CONTEXT(ctx);
 667          if (ctx && ctx->DrawBuffer == fb) {
 668             _mesa_notifySwapBuffers(ctx);       /* flush pending rendering */
 669          }
 670          if (intel->doPageFlip) {
 671             intelPageFlip(dPriv);
 672          }
 673          else {
 674             intelCopyBuffer(dPriv);
 675          }
 676       }
 677    }
 678    else {
 679       _mesa_problem(NULL,
 680                     "dPriv has no gl_framebuffer pointer in intelSwapBuffers");
 681    }
 682 }
 683 #else
 684 /* Trunk version:
 685  */
 686
 687 static GLboolean
 688 intelScheduleSwap(__DRIdrawablePrivate * dPriv, GLboolean *missed_target)
 689 {
 690    struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 691    unsigned int interval;
 692    struct intel_context *intel =
 693       intelScreenContext(dPriv->driScreenPriv->private);
 694    const intelScreenPrivate *intelScreen = intel->intelScreen;
 695    unsigned int target;
 696    drm_i915_vblank_swap_t swap;
 697    GLboolean ret;
 698
 699    if (!dPriv->vblFlags ||
 700        (dPriv->vblFlags & VBLANK_FLAG_NO_IRQ) ||
 701        intelScreen->drmMinor < (intel_fb->pf_active ? 9 : 6))
 702       return GL_FALSE;
 703
 704    interval = driGetVBlankInterval(dPriv);
 705
 706    swap.seqtype = DRM_VBLANK_ABSOLUTE;
 707
 708    if (dPriv->vblFlags & VBLANK_FLAG_SYNC) {
 709       swap.seqtype |= DRM_VBLANK_NEXTONMISS;
 710    } else if (interval == 0) {
 711       return GL_FALSE;
 712    }
 713
 714    swap.drawable = dPriv->hHWDrawable;
 715    target = swap.sequence = dPriv->vblSeq + interval;
 716
 717    if ( dPriv->vblFlags & VBLANK_FLAG_SECONDARY ) {
 718       swap.seqtype |= DRM_VBLANK_SECONDARY;
 719    }
 720
 721    LOCK_HARDWARE(intel);
 722
 723    intel_batchbuffer_flush(intel->batch);
 724
 725    if ( intel_fb->pf_active ) {
 726       swap.seqtype |= DRM_VBLANK_FLIP;
 727
 728       intel_fb->pf_current_page = (((intel->sarea->pf_current_page >>
 729                                      (intel_fb->pf_planes & 0x2)) & 0x3) + 1) %
 730                                   intel_fb->pf_num_pages;
 731    }
 732
 733    if (!drmCommandWriteRead(intel->driFd, DRM_I915_VBLANK_SWAP, &swap,
 734                             sizeof(swap))) {
 735       dPriv->vblSeq = swap.sequence;
 736       swap.sequence -= target;
 737       *missed_target = swap.sequence > 0 && swap.sequence <= (1 << 23);
 738
 739       intel_get_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT)->vbl_pending =
 740          intel_get_renderbuffer(&intel_fb->Base,
 741                                 BUFFER_FRONT_LEFT)->vbl_pending =
 742          dPriv->vblSeq;
 743
 744       if (swap.seqtype & DRM_VBLANK_FLIP) {
 745          intel_flip_renderbuffers(intel_fb);
 746          intel_draw_buffer(&intel->ctx, intel->ctx.DrawBuffer);
 747       }
 748
 749       ret = GL_TRUE;
 750    } else {
 751       if (swap.seqtype & DRM_VBLANK_FLIP) {
 752          intel_fb->pf_current_page = ((intel->sarea->pf_current_page >>
 753                                         (intel_fb->pf_planes & 0x2)) & 0x3) %
 754                                      intel_fb->pf_num_pages;
 755       }
 756
 757       ret = GL_FALSE;
 758    }
 759
 760    UNLOCK_HARDWARE(intel);
 761
 762    return ret;
 763 }
 764
 765 void
 766 intelSwapBuffers(__DRIdrawablePrivate * dPriv)
 767 {
 768    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 769       GET_CURRENT_CONTEXT(ctx);
 770       struct intel_context *intel;
 771
 772       if (ctx == NULL)
 773          return;
 774
 775       intel = intel_context(ctx);
 776
 777       if (ctx->Visual.doubleBufferMode) {
 778          intelScreenPrivate *screen = intel->intelScreen;
 779          GLboolean missed_target;
 780          struct intel_framebuffer *intel_fb = dPriv->driverPrivate;
 781          int64_t ust;
 782
 783          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 784
 785          if (!intelScheduleSwap(dPriv, &missed_target)) {
 786             driWaitForVBlank(dPriv, &missed_target);
 787
 788             if (!intelPageFlip(dPriv)) {
 789                intelCopyBuffer(dPriv, NULL);
 790             }
 791          }
 792
 793          intel_fb->swap_count++;
 794          (*dri_interface->getUST) (&ust);
 795          if (missed_target) {
 796             intel_fb->swap_missed_count++;
 797             intel_fb->swap_missed_ust = ust - intel_fb->swap_ust;
 798          }
 799
 800          intel_fb->swap_ust = ust;
 801       }
 802    }
 803    else {
 804       /* XXX this shouldn't be an error but we can't handle it for now */
 805       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 806    }
 807 }
 808 #endif
 809
 810 void
 811 intelCopySubBuffer(__DRIdrawablePrivate * dPriv, int x, int y, int w, int h)
 812 {
 813    if (dPriv->driContextPriv && dPriv->driContextPriv->driverPrivate) {
 814       struct intel_context *intel =
 815          (struct intel_context *) dPriv->driContextPriv->driverPrivate;
 816       GLcontext *ctx = &intel->ctx;
 817
 818       if (ctx->Visual.doubleBufferMode) {
 819          drm_clip_rect_t rect;
 820          rect.x1 = x + dPriv->x;
 821          rect.y1 = (dPriv->h - y - h) + dPriv->y;
 822          rect.x2 = rect.x1 + w;
 823          rect.y2 = rect.y1 + h;
 824          _mesa_notifySwapBuffers(ctx);  /* flush pending rendering comands */
 825          intelCopyBuffer(dPriv, &rect);
 826       }
 827    }
 828    else {
 829       /* XXX this shouldn't be an error but we can't handle it for now */
 830       fprintf(stderr, "%s: drawable has no context!\n", __FUNCTION__);
 831    }
 832 }
 833
 834
 835 /**
 836  * Update the hardware state for drawing into a window or framebuffer object.
 837  *
 838  * Called by glDrawBuffer, glBindFramebufferEXT, MakeCurrent, and other
 839  * places within the driver.
 840  *
 841  * Basically, this needs to be called any time the current framebuffer
 842  * changes, the renderbuffers change, or we need to draw into different
 843  * color buffers.
 844  */
 845 void
 846 intel_draw_buffer(GLcontext * ctx, struct gl_framebuffer *fb)
 847 {
 848    struct intel_context *intel = intel_context(ctx);
 849    struct intel_region *colorRegion, *depthRegion = NULL;
 850    struct intel_renderbuffer *irbDepth = NULL, *irbStencil = NULL;
 851    int front = 0;               /* drawing to front color buffer? */
 852
 853    if (!fb) {
 854       /* this can happen during the initial context initialization */
 855       return;
 856    }
 857
 858    /* Do this here, note core Mesa, since this function is called from
 859     * many places within the driver.
 860     */
 861    if (ctx->NewState & (_NEW_BUFFERS | _NEW_COLOR | _NEW_PIXEL)) {
 862       /* this updates the DrawBuffer->_NumColorDrawBuffers fields, etc */
 863       _mesa_update_framebuffer(ctx);
 864       /* this updates the DrawBuffer's Width/Height if it's a FBO */
 865       _mesa_update_draw_buffer_bounds(ctx);
 866    }
 867
 868    if (fb->_Status != GL_FRAMEBUFFER_COMPLETE_EXT) {
 869       /* this may occur when we're called by glBindFrameBuffer() during
 870        * the process of someone setting up renderbuffers, etc.
 871        */
 872       /*_mesa_debug(ctx, "DrawBuffer: incomplete user FBO\n");*/
 873       return;
 874    }
 875
 876    if (fb->Name)
 877       intel_validate_paired_depth_stencil(ctx, fb);
 878
 879    /*
 880     * How many color buffers are we drawing into?
 881     */
 882    if (fb->_NumColorDrawBuffers[0] != 1
 883 #if 0
 884        /* XXX FBO temporary - always use software rendering */
 885        || 1
 886 #endif
 887       ) {
 888       /* writing to 0 or 2 or 4 color buffers */
 889       /*_mesa_debug(ctx, "Software rendering\n");*/
 890       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 891       front = 1;                /* might not have back color buffer */
 892    }
 893    else {
 894       /* draw to exactly one color buffer */
 895       /*_mesa_debug(ctx, "Hardware rendering\n");*/
 896       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 897       if (fb->_ColorDrawBufferMask[0] == BUFFER_BIT_FRONT_LEFT) {
 898          front = 1;
 899       }
 900    }
 901
 902    /*
 903     * Get the intel_renderbuffer for the colorbuffer we're drawing into.
 904     * And set up cliprects.
 905     */
 906    if (fb->Name == 0) {
 907       /* drawing to window system buffer */
 908       if (front) {
 909          intelSetFrontClipRects(intel);
 910          colorRegion = intel_get_rb_region(fb, BUFFER_FRONT_LEFT);
 911       }
 912       else {
 913          intelSetBackClipRects(intel);
 914          colorRegion = intel_get_rb_region(fb, BUFFER_BACK_LEFT);
 915       }
 916    }
 917    else {
 918       /* drawing to user-created FBO */
 919       struct intel_renderbuffer *irb;
 920       intelSetRenderbufferClipRects(intel);
 921       irb = intel_renderbuffer(fb->_ColorDrawBuffers[0][0]);
 922       colorRegion = (irb && irb->region) ? irb->region : NULL;
 923    }
 924
 925    /* Update culling direction which changes depending on the
 926     * orientation of the buffer:
 927     */
 928    if (ctx->Driver.FrontFace)
 929       ctx->Driver.FrontFace(ctx, ctx->Polygon.FrontFace);
 930    else
 931       ctx->NewState |= _NEW_POLYGON;
 932
 933    if (!colorRegion) {
 934       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_TRUE);
 935    }
 936    else {
 937       FALLBACK(intel, INTEL_FALLBACK_DRAW_BUFFER, GL_FALSE);
 938    }
 939
 940    /***
 941     *** Get depth buffer region and check if we need a software fallback.
 942     *** Note that the depth buffer is usually a DEPTH_STENCIL buffer.
 943     ***/
 944    if (fb->_DepthBuffer && fb->_DepthBuffer->Wrapped) {
 945       irbDepth = intel_renderbuffer(fb->_DepthBuffer->Wrapped);
 946       if (irbDepth && irbDepth->region) {
 947          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 948          depthRegion = irbDepth->region;
 949       }
 950       else {
 951          FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_TRUE);
 952          depthRegion = NULL;
 953       }
 954    }
 955    else {
 956       /* not using depth buffer */
 957       FALLBACK(intel, INTEL_FALLBACK_DEPTH_BUFFER, GL_FALSE);
 958       depthRegion = NULL;
 959    }
 960
 961    /***
 962     *** Stencil buffer
 963     *** This can only be hardware accelerated if we're using a
 964     *** combined DEPTH_STENCIL buffer (for now anyway).
 965     ***/
 966    if (fb->_StencilBuffer && fb->_StencilBuffer->Wrapped) {
 967       irbStencil = intel_renderbuffer(fb->_StencilBuffer->Wrapped);
 968       if (irbStencil && irbStencil->region) {
 969          ASSERT(irbStencil->Base._ActualFormat == GL_DEPTH24_STENCIL8_EXT);
 970          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 971          /* need to re-compute stencil hw state */
 972          ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
 973          if (!depthRegion)
 974             depthRegion = irbStencil->region;
 975       }
 976       else {
 977          FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_TRUE);
 978       }
 979    }
 980    else {
 981       /* XXX FBO: instead of FALSE, pass ctx->Stencil.Enabled ??? */
 982       FALLBACK(intel, INTEL_FALLBACK_STENCIL_BUFFER, GL_FALSE);
 983       /* need to re-compute stencil hw state */
 984       ctx->Driver.Enable(ctx, GL_STENCIL_TEST, ctx->Stencil.Enabled);
 985    }
 986
 987    /*
 988     * Update depth test state
 989     */
 990    if (ctx->Depth.Test && fb->Visual.depthBits > 0) {
 991       ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_TRUE);
 992    }
 993    else {
 994       ctx->Driver.Enable(ctx, GL_DEPTH_TEST, GL_FALSE);
 995    }
 996
 997    /**
 998     ** Release old regions, reference new regions
 999     **/
1000 #if 0                           /* XXX FBO: this seems to be redundant with i915_state_draw_region() */
1001    if (intel->draw_region != colorRegion) {
1002       intel_region_release(&intel->draw_region);
1003       intel_region_reference(&intel->draw_region, colorRegion);
1004    }
1005    if (intel->intelScreen->depth_region != depthRegion) {
1006       intel_region_release(&intel->intelScreen->depth_region);
1007       intel_region_reference(&intel->intelScreen->depth_region, depthRegion);
1008    }
1009 #endif
1010
1011    intel->vtbl.set_draw_region(intel, colorRegion, depthRegion);
1012
1013    /* update viewport since it depends on window size */
1014    ctx->Driver.Viewport(ctx, ctx->Viewport.X, ctx->Viewport.Y,
1015                         ctx->Viewport.Width, ctx->Viewport.Height);
1016
1017    /* Update hardware scissor */
1018    ctx->Driver.Scissor(ctx, ctx->Scissor.X, ctx->Scissor.Y,
1019                        ctx->Scissor.Width, ctx->Scissor.Height);
1020 }
1021
1022
1023 static void
1024 intelDrawBuffer(GLcontext * ctx, GLenum mode)
1025 {
1026    intel_draw_buffer(ctx, ctx->DrawBuffer);
1027 }
1028
1029
1030 static void
1031 intelReadBuffer(GLcontext * ctx, GLenum mode)
1032 {
1033    if (ctx->ReadBuffer == ctx->DrawBuffer) {
1034       /* This will update FBO completeness status.
1035        * A framebuffer will be incomplete if the GL_READ_BUFFER setting
1036        * refers to a missing renderbuffer.  Calling glReadBuffer can set
1037        * that straight and can make the drawing buffer complete.
1038        */
1039       intel_draw_buffer(ctx, ctx->DrawBuffer);
1040    }
1041    /* Generally, functions which read pixels (glReadPixels, glCopyPixels, etc)
1042     * reference ctx->ReadBuffer and do appropriate state checks.
1043     */
1044 }
1045
1046
1047 void
1048 intelInitBufferFuncs(struct dd_function_table *functions)
1049 {
1050    functions->Clear = intelClear;
1051    functions->DrawBuffer = intelDrawBuffer;
1052    functions->ReadBuffer = intelReadBuffer;
1053 }