src/mesa/drivers/dri/intel/intel_regions.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2006 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 /* Provide additional functionality on top of bufmgr buffers:
  29  *   - 2d semantics and blit operations
  30  *   - refcounting of buffers for multiple images in a buffer.
  31  *   - refcounting of buffer mappings.
  32  *   - some logic for moving the buffers to the best memory pools for
  33  *     given operations.
  34  *
  35  * Most of this is to make it easier to implement the fixed-layout
  36  * mipmap tree required by intel hardware in the face of GL's
  37  * programming interface where each image can be specifed in random
  38  * order and it isn't clear what layout the tree should have until the
  39  * last moment.
  40  */
  41
  42 #include "intel_context.h"
  43 #include "intel_regions.h"
  44 #include "intel_blit.h"
  45 #include "intel_buffer_objects.h"
  46 #include "dri_bufmgr.h"
  47 #include "intel_bufmgr_ttm.h"
  48 #include "intel_batchbuffer.h"
  49
  50 #define FILE_DEBUG_FLAG DEBUG_REGION
  51
  52 /* XXX: Thread safety?
  53  */
  54 GLubyte *
  55 intel_region_map(struct intel_context *intel, struct intel_region *region)
  56 {
  57    DBG("%s\n", __FUNCTION__);
  58    if (!region->map_refcount++) {
  59       if (region->pbo)
  60          intel_region_cow(intel, region);
  61
  62       dri_bo_map(region->buffer, GL_TRUE);
  63       region->map = region->buffer->virtual;
  64    }
  65
  66    return region->map;
  67 }
  68
  69 void
  70 intel_region_unmap(struct intel_context *intel, struct intel_region *region)
  71 {
  72    DBG("%s\n", __FUNCTION__);
  73    if (!--region->map_refcount) {
  74       dri_bo_unmap(region->buffer);
  75       region->map = NULL;
  76    }
  77 }
  78
  79 struct intel_region *
  80 intel_region_alloc(struct intel_context *intel,
  81                    GLuint cpp, GLuint pitch, GLuint height)
  82 {
  83    struct intel_region *region = calloc(sizeof(*region), 1);
  84
  85    DBG("%s\n", __FUNCTION__);
  86
  87    region->cpp = cpp;
  88    region->pitch = pitch;
  89    region->height = height;     /* needed? */
  90    region->refcount = 1;
  91
  92    region->buffer = dri_bo_alloc(intel->bufmgr, "region",
  93                                  pitch * cpp * height, 64, DRM_BO_FLAG_MEM_TT);
  94    return region;
  95 }
  96
  97 void
  98 intel_region_reference(struct intel_region **dst, struct intel_region *src)
  99 {
 100    assert(*dst == NULL);
 101    if (src) {
 102       src->refcount++;
 103       *dst = src;
 104    }
 105 }
 106
 107 void
 108 intel_region_release(struct intel_region **region)
 109 {
 110    if (!*region)
 111       return;
 112
 113    DBG("%s %d\n", __FUNCTION__, (*region)->refcount - 1);
 114
 115    ASSERT((*region)->refcount > 0);
 116    (*region)->refcount--;
 117
 118    if ((*region)->refcount == 0) {
 119       assert((*region)->map_refcount == 0);
 120
 121       if ((*region)->pbo)
 122          (*region)->pbo->region = NULL;
 123       (*region)->pbo = NULL;
 124       dri_bo_unreference((*region)->buffer);
 125       free(*region);
 126    }
 127    *region = NULL;
 128 }
 129
 130 /*
 131  * XXX Move this into core Mesa?
 132  */
 133 static void
 134 _mesa_copy_rect(GLubyte * dst,
 135                 GLuint cpp,
 136                 GLuint dst_pitch,
 137                 GLuint dst_x,
 138                 GLuint dst_y,
 139                 GLuint width,
 140                 GLuint height,
 141                 const GLubyte * src,
 142                 GLuint src_pitch, GLuint src_x, GLuint src_y)
 143 {
 144    GLuint i;
 145
 146    dst_pitch *= cpp;
 147    src_pitch *= cpp;
 148    dst += dst_x * cpp;
 149    src += src_x * cpp;
 150    dst += dst_y * dst_pitch;
 151    src += src_y * dst_pitch;
 152    width *= cpp;
 153
 154    if (width == dst_pitch && width == src_pitch)
 155       memcpy(dst, src, height * width);
 156    else {
 157       for (i = 0; i < height; i++) {
 158          memcpy(dst, src, width);
 159          dst += dst_pitch;
 160          src += src_pitch;
 161       }
 162    }
 163 }
 164
 165
 166 /* Upload data to a rectangular sub-region.  Lots of choices how to do this:
 167  *
 168  * - memcpy by span to current destination
 169  * - upload data as new buffer and blit
 170  *
 171  * Currently always memcpy.
 172  */
 173 void
 174 intel_region_data(struct intel_context *intel,
 175                   struct intel_region *dst,
 176                   GLuint dst_offset,
 177                   GLuint dstx, GLuint dsty,
 178                   const void *src, GLuint src_pitch,
 179                   GLuint srcx, GLuint srcy, GLuint width, GLuint height)
 180 {
 181    DBG("%s\n", __FUNCTION__);
 182
 183    if (intel == NULL)
 184       return;
 185
 186    if (dst->pbo) {
 187       if (dstx == 0 &&
 188           dsty == 0 && width == dst->pitch && height == dst->height)
 189          intel_region_release_pbo(intel, dst);
 190       else
 191          intel_region_cow(intel, dst);
 192    }
 193
 194
 195    LOCK_HARDWARE(intel);
 196
 197    _mesa_copy_rect(intel_region_map(intel, dst) + dst_offset,
 198                    dst->cpp,
 199                    dst->pitch,
 200                    dstx, dsty, width, height, src, src_pitch, srcx, srcy);
 201
 202    intel_region_unmap(intel, dst);
 203
 204    UNLOCK_HARDWARE(intel);
 205
 206 }
 207
 208 /* Copy rectangular sub-regions. Need better logic about when to
 209  * push buffers into AGP - will currently do so whenever possible.
 210  */
 211 void
 212 intel_region_copy(struct intel_context *intel,
 213                   struct intel_region *dst,
 214                   GLuint dst_offset,
 215                   GLuint dstx, GLuint dsty,
 216                   struct intel_region *src,
 217                   GLuint src_offset,
 218                   GLuint srcx, GLuint srcy, GLuint width, GLuint height)
 219 {
 220    DBG("%s\n", __FUNCTION__);
 221
 222    if (intel == NULL)
 223       return;
 224
 225    if (dst->pbo) {
 226       if (dstx == 0 &&
 227           dsty == 0 && width == dst->pitch && height == dst->height)
 228          intel_region_release_pbo(intel, dst);
 229       else
 230          intel_region_cow(intel, dst);
 231    }
 232
 233    assert(src->cpp == dst->cpp);
 234
 235    intelEmitCopyBlit(intel,
 236                      dst->cpp,
 237                      src->pitch, src->buffer, src_offset, src->tiled,
 238                      dst->pitch, dst->buffer, dst_offset, dst->tiled,
 239                      srcx, srcy, dstx, dsty, width, height,
 240                      GL_COPY);
 241 }
 242
 243 /* Fill a rectangular sub-region.  Need better logic about when to
 244  * push buffers into AGP - will currently do so whenever possible.
 245  */
 246 void
 247 intel_region_fill(struct intel_context *intel,
 248                   struct intel_region *dst,
 249                   GLuint dst_offset,
 250                   GLuint dstx, GLuint dsty,
 251                   GLuint width, GLuint height, GLuint color)
 252 {
 253    DBG("%s\n", __FUNCTION__);
 254
 255    if (intel == NULL)
 256       return;
 257
 258    if (dst->pbo) {
 259       if (dstx == 0 &&
 260           dsty == 0 && width == dst->pitch && height == dst->height)
 261          intel_region_release_pbo(intel, dst);
 262       else
 263          intel_region_cow(intel, dst);
 264    }
 265
 266    intelEmitFillBlit(intel,
 267                      dst->cpp,
 268                      dst->pitch, dst->buffer, dst_offset, dst->tiled,
 269                      dstx, dsty, width, height, color);
 270 }
 271
 272 /* Attach to a pbo, discarding our data.  Effectively zero-copy upload
 273  * the pbo's data.
 274  */
 275 void
 276 intel_region_attach_pbo(struct intel_context *intel,
 277                         struct intel_region *region,
 278                         struct intel_buffer_object *pbo)
 279 {
 280    if (region->pbo == pbo)
 281       return;
 282
 283    /* If there is already a pbo attached, break the cow tie now.
 284     * Don't call intel_region_release_pbo() as that would
 285     * unnecessarily allocate a new buffer we would have to immediately
 286     * discard.
 287     */
 288    if (region->pbo) {
 289       region->pbo->region = NULL;
 290       region->pbo = NULL;
 291    }
 292
 293    if (region->buffer) {
 294       dri_bo_unreference(region->buffer);
 295       region->buffer = NULL;
 296    }
 297
 298    region->pbo = pbo;
 299    region->pbo->region = region;
 300    dri_bo_reference(pbo->buffer);
 301    region->buffer = pbo->buffer;
 302 }
 303
 304
 305 /* Break the COW tie to the pbo and allocate a new buffer.
 306  * The pbo gets to keep the data.
 307  */
 308 void
 309 intel_region_release_pbo(struct intel_context *intel,
 310                          struct intel_region *region)
 311 {
 312    assert(region->buffer == region->pbo->buffer);
 313    region->pbo->region = NULL;
 314    region->pbo = NULL;
 315    dri_bo_unreference(region->buffer);
 316    region->buffer = NULL;
 317
 318    region->buffer = dri_bo_alloc(intel->bufmgr, "region",
 319                                  region->pitch * region->cpp * region->height,
 320                                  64, DRM_BO_FLAG_MEM_TT);
 321 }
 322
 323 /* Break the COW tie to the pbo.  Both the pbo and the region end up
 324  * with a copy of the data.
 325  */
 326 void
 327 intel_region_cow(struct intel_context *intel, struct intel_region *region)
 328 {
 329    struct intel_buffer_object *pbo = region->pbo;
 330    GLboolean was_locked = intel->locked;
 331
 332    if (intel == NULL)
 333       return;
 334
 335    intel_region_release_pbo(intel, region);
 336
 337    assert(region->cpp * region->pitch * region->height == pbo->Base.Size);
 338
 339    DBG("%s (%d bytes)\n", __FUNCTION__, pbo->Base.Size);
 340
 341    /* Now blit from the texture buffer to the new buffer:
 342     */
 343
 344    intel_batchbuffer_flush(intel->batch);
 345
 346    was_locked = intel->locked;
 347    if (intel->locked)
 348       LOCK_HARDWARE(intel);
 349
 350    intelEmitCopyBlit(intel,
 351                      region->cpp,
 352                      region->pitch, region->buffer, 0, region->tiled,
 353                      region->pitch, pbo->buffer, 0, region->tiled,
 354                      0, 0, 0, 0,
 355                      region->pitch, region->height,
 356                      GL_COPY);
 357
 358    intel_batchbuffer_flush(intel->batch);
 359
 360    if (was_locked)
 361       UNLOCK_HARDWARE(intel);
 362 }
 363
 364 dri_bo *
 365 intel_region_buffer(struct intel_context *intel,
 366                     struct intel_region *region, GLuint flag)
 367 {
 368    if (region->pbo) {
 369       if (flag == INTEL_WRITE_PART)
 370          intel_region_cow(intel, region);
 371       else if (flag == INTEL_WRITE_FULL)
 372          intel_region_release_pbo(intel, region);
 373    }
 374
 375    return region->buffer;
 376 }
 377
 378 static struct intel_region *
 379 intel_recreate_static(struct intel_context *intel,
 380                       const char *name,
 381                       struct intel_region *region,
 382                       intelRegion *region_desc,
 383                       GLuint mem_type)
 384 {
 385    intelScreenPrivate *intelScreen = intel->intelScreen;
 386
 387    if (region == NULL) {
 388       region = calloc(sizeof(*region), 1);
 389       region->refcount = 1;
 390    }
 391
 392    region->cpp = intelScreen->cpp;
 393    region->pitch = region_desc->pitch / intelScreen->cpp;
 394    region->height = intelScreen->height;     /* needed? */
 395    region->tiled = region_desc->tiled;
 396
 397    if (intel->ttm) {
 398       assert(region_desc->bo_handle != -1);
 399       region->buffer = intel_ttm_bo_create_from_handle(intel->bufmgr,
 400                                                        name,
 401                                                        region_desc->bo_handle);
 402    } else {
 403       region->buffer = dri_bo_alloc_static(intel->bufmgr,
 404                                            name,
 405                                            region_desc->offset,
 406                                            region_desc->pitch *
 407                                            intelScreen->height,
 408                                            region_desc->map,
 409                                            DRM_BO_FLAG_MEM_TT);
 410    }
 411
 412    assert(region->buffer != NULL);
 413
 414    return region;
 415 }
 416
 417 /**
 418  * Create intel_region structs to describe the static front, back, and depth
 419  * buffers created by the xserver.
 420  *
 421  * Although FBO's mean we now no longer use these as render targets in
 422  * all circumstances, they won't go away until the back and depth
 423  * buffers become private, and the front buffer will remain even then.
 424  *
 425  * Note that these don't allocate video memory, just describe
 426  * allocations alread made by the X server.
 427  */
 428 void
 429 intel_recreate_static_regions(struct intel_context *intel)
 430 {
 431    intelScreenPrivate *intelScreen = intel->intelScreen;
 432
 433    intel->front_region =
 434       intel_recreate_static(intel, "front",
 435                             intel->front_region,
 436                             &intelScreen->front,
 437                             DRM_BO_FLAG_MEM_TT);
 438
 439    intel->back_region =
 440       intel_recreate_static(intel, "back",
 441                             intel->back_region,
 442                             &intelScreen->back,
 443                             DRM_BO_FLAG_MEM_TT);
 444
 445 #ifdef I915
 446    if (intelScreen->third.handle) {
 447       intel->third_region =
 448          intel_recreate_static(intel, "third",
 449                                intel->third_region,
 450                                &intelScreen->third,
 451                                DRM_BO_FLAG_MEM_TT);
 452    }
 453 #endif /* I915 */
 454
 455    /* Still assumes front.cpp == depth.cpp.  We can kill this when we move to
 456     * private buffers.
 457     */
 458    intel->depth_region =
 459       intel_recreate_static(intel, "depth",
 460                             intel->depth_region,
 461                             &intelScreen->depth,
 462                             DRM_BO_FLAG_MEM_TT);
 463 }