OpenTTD
newgrf_commons.cpp
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1 /* $Id: newgrf_commons.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8  */
9 
15 #include "stdafx.h"
16 #include "debug.h"
17 #include "landscape.h"
18 #include "house.h"
19 #include "industrytype.h"
20 #include "newgrf_config.h"
21 #include "clear_map.h"
22 #include "station_map.h"
23 #include "tree_map.h"
24 #include "tunnelbridge_map.h"
25 #include "newgrf_object.h"
26 #include "genworld.h"
27 #include "newgrf_spritegroup.h"
28 #include "newgrf_text.h"
29 #include "company_base.h"
30 #include "error.h"
31 #include "strings_func.h"
32 
33 #include "table/strings.h"
34 
35 #include "safeguards.h"
36 
43 OverrideManagerBase::OverrideManagerBase(uint16 offset, uint16 maximum, uint16 invalid)
44 {
45  max_offset = offset;
46  max_new_entities = maximum;
47  invalid_ID = invalid;
48 
49  mapping_ID = CallocT<EntityIDMapping>(max_new_entities);
50  entity_overrides = MallocT<uint16>(max_offset);
51  for (size_t i = 0; i < max_offset; i++) entity_overrides[i] = invalid;
52  grfid_overrides = CallocT<uint32>(max_offset);
53 }
54 
60 {
62  free(entity_overrides);
63  free(grfid_overrides);
64 }
65 
74 void OverrideManagerBase::Add(uint8 local_id, uint32 grfid, uint entity_type)
75 {
76  assert(entity_type < max_offset);
77  /* An override can be set only once */
78  if (entity_overrides[entity_type] != invalid_ID) return;
79  entity_overrides[entity_type] = local_id;
80  grfid_overrides[entity_type] = grfid;
81 }
82 
85 {
86  memset(mapping_ID, 0, (max_new_entities - 1) * sizeof(EntityIDMapping));
87 }
88 
91 {
92  for (uint16 i = 0; i < max_offset; i++) {
93  entity_overrides[i] = invalid_ID;
94  grfid_overrides[i] = 0;
95  }
96 }
97 
104 uint16 OverrideManagerBase::GetID(uint8 grf_local_id, uint32 grfid) const
105 {
106  const EntityIDMapping *map;
107 
108  for (uint16 id = 0; id < max_new_entities; id++) {
109  map = &mapping_ID[id];
110  if (map->entity_id == grf_local_id && map->grfid == grfid) {
111  return id;
112  }
113  }
114 
115  return invalid_ID;
116 }
117 
125 uint16 OverrideManagerBase::AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id)
126 {
127  uint16 id = this->GetID(grf_local_id, grfid);
128  EntityIDMapping *map;
129 
130  /* Look to see if this entity has already been added. This is done
131  * separately from the loop below in case a GRF has been deleted, and there
132  * are any gaps in the array.
133  */
134  if (id != invalid_ID) {
135  return id;
136  }
137 
138  /* This entity hasn't been defined before, so give it an ID now. */
139  for (id = max_offset; id < max_new_entities; id++) {
140  map = &mapping_ID[id];
141 
142  if (CheckValidNewID(id) && map->entity_id == 0 && map->grfid == 0) {
143  map->entity_id = grf_local_id;
144  map->grfid = grfid;
145  map->substitute_id = substitute_id;
146  return id;
147  }
148  }
149 
150  return invalid_ID;
151 }
152 
158 uint32 OverrideManagerBase::GetGRFID(uint16 entity_id) const
159 {
160  return mapping_ID[entity_id].grfid;
161 }
162 
168 uint16 OverrideManagerBase::GetSubstituteID(uint16 entity_id) const
169 {
170  return mapping_ID[entity_id].substitute_id;
171 }
172 
179 {
180  HouseID house_id = this->AddEntityID(hs->grf_prop.local_id, hs->grf_prop.grffile->grfid, hs->grf_prop.subst_id);
181 
182  if (house_id == invalid_ID) {
183  grfmsg(1, "House.SetEntitySpec: Too many houses allocated. Ignoring.");
184  return;
185  }
186 
187  MemCpyT(HouseSpec::Get(house_id), hs);
188 
189  /* Now add the overrides. */
190  for (int i = 0; i != max_offset; i++) {
191  HouseSpec *overridden_hs = HouseSpec::Get(i);
192 
193  if (entity_overrides[i] != hs->grf_prop.local_id || grfid_overrides[i] != hs->grf_prop.grffile->grfid) continue;
194 
195  overridden_hs->grf_prop.override = house_id;
196  entity_overrides[i] = invalid_ID;
197  grfid_overrides[i] = 0;
198  }
199 }
200 
207 uint16 IndustryOverrideManager::GetID(uint8 grf_local_id, uint32 grfid) const
208 {
209  uint16 id = OverrideManagerBase::GetID(grf_local_id, grfid);
210  if (id != invalid_ID) return id;
211 
212  /* No mapping found, try the overrides */
213  for (id = 0; id < max_offset; id++) {
214  if (entity_overrides[id] == grf_local_id && grfid_overrides[id] == grfid) return id;
215  }
216 
217  return invalid_ID;
218 }
219 
227 uint16 IndustryOverrideManager::AddEntityID(byte grf_local_id, uint32 grfid, byte substitute_id)
228 {
229  /* This entity hasn't been defined before, so give it an ID now. */
230  for (uint16 id = 0; id < max_new_entities; id++) {
231  /* Skip overridden industries */
232  if (id < max_offset && entity_overrides[id] != invalid_ID) continue;
233 
234  /* Get the real live industry */
235  const IndustrySpec *inds = GetIndustrySpec(id);
236 
237  /* This industry must be one that is not available(enabled), mostly because of climate.
238  * And it must not already be used by a grf (grffile == NULL).
239  * So reserve this slot here, as it is the chosen one */
240  if (!inds->enabled && inds->grf_prop.grffile == NULL) {
241  EntityIDMapping *map = &mapping_ID[id];
242 
243  if (map->entity_id == 0 && map->grfid == 0) {
244  /* winning slot, mark it as been used */
245  map->entity_id = grf_local_id;
246  map->grfid = grfid;
247  map->substitute_id = substitute_id;
248  return id;
249  }
250  }
251  }
252 
253  return invalid_ID;
254 }
255 
263 {
264  /* First step : We need to find if this industry is already specified in the savegame data. */
265  IndustryType ind_id = this->GetID(inds->grf_prop.local_id, inds->grf_prop.grffile->grfid);
266 
267  if (ind_id == invalid_ID) {
268  /* Not found.
269  * Or it has already been overridden, so you've lost your place old boy.
270  * Or it is a simple substitute.
271  * We need to find a free available slot */
272  ind_id = this->AddEntityID(inds->grf_prop.local_id, inds->grf_prop.grffile->grfid, inds->grf_prop.subst_id);
273  inds->grf_prop.override = invalid_ID; // make sure it will not be detected as overridden
274  }
275 
276  if (ind_id == invalid_ID) {
277  grfmsg(1, "Industry.SetEntitySpec: Too many industries allocated. Ignoring.");
278  return;
279  }
280 
281  /* Now that we know we can use the given id, copy the spec to its final destination... */
282  memcpy(&_industry_specs[ind_id], inds, sizeof(*inds));
283  /* ... and mark it as usable*/
284  _industry_specs[ind_id].enabled = true;
285 }
286 
287 void IndustryTileOverrideManager::SetEntitySpec(const IndustryTileSpec *its)
288 {
289  IndustryGfx indt_id = this->AddEntityID(its->grf_prop.local_id, its->grf_prop.grffile->grfid, its->grf_prop.subst_id);
290 
291  if (indt_id == invalid_ID) {
292  grfmsg(1, "IndustryTile.SetEntitySpec: Too many industry tiles allocated. Ignoring.");
293  return;
294  }
295 
296  memcpy(&_industry_tile_specs[indt_id], its, sizeof(*its));
297 
298  /* Now add the overrides. */
299  for (int i = 0; i < max_offset; i++) {
300  IndustryTileSpec *overridden_its = &_industry_tile_specs[i];
301 
302  if (entity_overrides[i] != its->grf_prop.local_id || grfid_overrides[i] != its->grf_prop.grffile->grfid) continue;
303 
304  overridden_its->grf_prop.override = indt_id;
305  overridden_its->enabled = false;
306  entity_overrides[i] = invalid_ID;
307  grfid_overrides[i] = 0;
308  }
309 }
310 
318 {
319  /* First step : We need to find if this object is already specified in the savegame data. */
320  ObjectType type = this->GetID(spec->grf_prop.local_id, spec->grf_prop.grffile->grfid);
321 
322  if (type == invalid_ID) {
323  /* Not found.
324  * Or it has already been overridden, so you've lost your place old boy.
325  * Or it is a simple substitute.
326  * We need to find a free available slot */
327  type = this->AddEntityID(spec->grf_prop.local_id, spec->grf_prop.grffile->grfid, OBJECT_TRANSMITTER);
328  }
329 
330  if (type == invalid_ID) {
331  grfmsg(1, "Object.SetEntitySpec: Too many objects allocated. Ignoring.");
332  return;
333  }
334 
336 
337  /* Now that we know we can use the given id, copy the spec to its final destination. */
338  memcpy(&_object_specs[type], spec, sizeof(*spec));
339  ObjectClass::Assign(&_object_specs[type]);
340 }
341 
350 uint32 GetTerrainType(TileIndex tile, TileContext context)
351 {
353  case LT_TROPIC: return GetTropicZone(tile);
354  case LT_ARCTIC: {
355  bool has_snow;
356  switch (GetTileType(tile)) {
357  case MP_CLEAR:
358  /* During map generation the snowstate may not be valid yet, as the tileloop may not have run yet. */
359  if (_generating_world) goto genworld;
360  has_snow = IsSnowTile(tile) && GetClearDensity(tile) >= 2;
361  break;
362 
363  case MP_RAILWAY: {
364  /* During map generation the snowstate may not be valid yet, as the tileloop may not have run yet. */
365  if (_generating_world) goto genworld; // we do not care about foundations here
366  RailGroundType ground = GetRailGroundType(tile);
367  has_snow = (ground == RAIL_GROUND_ICE_DESERT || (context == TCX_UPPER_HALFTILE && ground == RAIL_GROUND_HALF_SNOW));
368  break;
369  }
370 
371  case MP_ROAD:
372  /* During map generation the snowstate may not be valid yet, as the tileloop may not have run yet. */
373  if (_generating_world) goto genworld; // we do not care about foundations here
374  has_snow = IsOnSnow(tile);
375  break;
376 
377  case MP_TREES: {
378  /* During map generation the snowstate may not be valid yet, as the tileloop may not have run yet. */
379  if (_generating_world) goto genworld;
380  TreeGround ground = GetTreeGround(tile);
381  has_snow = (ground == TREE_GROUND_SNOW_DESERT || ground == TREE_GROUND_ROUGH_SNOW) && GetTreeDensity(tile) >= 2;
382  break;
383  }
384 
385  case MP_TUNNELBRIDGE:
386  if (context == TCX_ON_BRIDGE) {
387  has_snow = (GetBridgeHeight(tile) > GetSnowLine());
388  } else {
389  /* During map generation the snowstate may not be valid yet, as the tileloop may not have run yet. */
390  if (_generating_world) goto genworld; // we do not care about foundations here
391  has_snow = HasTunnelBridgeSnowOrDesert(tile);
392  }
393  break;
394 
395  case MP_STATION:
396  case MP_HOUSE:
397  case MP_INDUSTRY:
398  case MP_OBJECT:
399  /* These tiles usually have a levelling foundation. So use max Z */
400  has_snow = (GetTileMaxZ(tile) > GetSnowLine());
401  break;
402 
403  case MP_VOID:
404  case MP_WATER:
405  genworld:
406  has_snow = (GetTileZ(tile) > GetSnowLine());
407  break;
408 
409  default: NOT_REACHED();
410  }
411  return has_snow ? 4 : 0;
412  }
413  default: return 0;
414  }
415 }
416 
425 TileIndex GetNearbyTile(byte parameter, TileIndex tile, bool signed_offsets, Axis axis)
426 {
427  int8 x = GB(parameter, 0, 4);
428  int8 y = GB(parameter, 4, 4);
429 
430  if (signed_offsets && x >= 8) x -= 16;
431  if (signed_offsets && y >= 8) y -= 16;
432 
433  /* Swap width and height depending on axis for railway stations */
434  if (axis == INVALID_AXIS && HasStationTileRail(tile)) axis = GetRailStationAxis(tile);
435  if (axis == AXIS_Y) Swap(x, y);
436 
437  /* Make sure we never roam outside of the map, better wrap in that case */
438  return TILE_MASK(tile + TileDiffXY(x, y));
439 }
440 
448 uint32 GetNearbyTileInformation(TileIndex tile, bool grf_version8)
449 {
450  TileType tile_type = GetTileType(tile);
451 
452  /* Fake tile type for trees on shore */
453  if (IsTileType(tile, MP_TREES) && GetTreeGround(tile) == TREE_GROUND_SHORE) tile_type = MP_WATER;
454 
455  int z;
456  Slope tileh = GetTilePixelSlope(tile, &z);
457  /* Return 0 if the tile is a land tile */
458  byte terrain_type = (HasTileWaterClass(tile) ? (GetWaterClass(tile) + 1) & 3 : 0) << 5 | GetTerrainType(tile) << 2 | (tile_type == MP_WATER ? 1 : 0) << 1;
459  if (grf_version8) z /= TILE_HEIGHT;
460  return tile_type << 24 | Clamp(z, 0, 0xFF) << 16 | terrain_type << 8 | tileh;
461 }
462 
469 uint32 GetCompanyInfo(CompanyID owner, const Livery *l)
470 {
471  if (l == NULL && Company::IsValidID(owner)) l = &Company::Get(owner)->livery[LS_DEFAULT];
472  return owner | (Company::IsValidAiID(owner) ? 0x10000 : 0) | (l != NULL ? (l->colour1 << 24) | (l->colour2 << 28) : 0);
473 }
474 
482 CommandCost GetErrorMessageFromLocationCallbackResult(uint16 cb_res, const GRFFile *grffile, StringID default_error)
483 {
484  CommandCost res;
485 
486  if (cb_res < 0x400) {
487  res = CommandCost(GetGRFStringID(grffile->grfid, 0xD000 + cb_res));
488  } else {
489  switch (cb_res) {
490  case 0x400: return res; // No error.
491 
492  default: // unknown reason -> default error
493  case 0x401: res = CommandCost(default_error); break;
494 
495  case 0x402: res = CommandCost(STR_ERROR_CAN_ONLY_BE_BUILT_IN_RAINFOREST); break;
496  case 0x403: res = CommandCost(STR_ERROR_CAN_ONLY_BE_BUILT_IN_DESERT); break;
497  case 0x404: res = CommandCost(STR_ERROR_CAN_ONLY_BE_BUILT_ABOVE_SNOW_LINE); break;
498  case 0x405: res = CommandCost(STR_ERROR_CAN_ONLY_BE_BUILT_BELOW_SNOW_LINE); break;
499  case 0x406: res = CommandCost(STR_ERROR_CAN_T_BUILD_ON_SEA); break;
500  case 0x407: res = CommandCost(STR_ERROR_CAN_T_BUILD_ON_CANAL); break;
501  case 0x408: res = CommandCost(STR_ERROR_CAN_T_BUILD_ON_RIVER); break;
502  }
503  }
504 
505  /* Copy some parameters from the registers to the error message text ref. stack */
506  res.UseTextRefStack(grffile, 4);
507 
508  return res;
509 }
510 
518 void ErrorUnknownCallbackResult(uint32 grfid, uint16 cbid, uint16 cb_res)
519 {
520  GRFConfig *grfconfig = GetGRFConfig(grfid);
521 
522  if (!HasBit(grfconfig->grf_bugs, GBUG_UNKNOWN_CB_RESULT)) {
524  SetDParamStr(0, grfconfig->GetName());
525  SetDParam(1, cbid);
526  SetDParam(2, cb_res);
527  ShowErrorMessage(STR_NEWGRF_BUGGY, STR_NEWGRF_BUGGY_UNKNOWN_CALLBACK_RESULT, WL_CRITICAL);
528  }
529 
530  /* debug output */
531  char buffer[512];
532 
533  SetDParamStr(0, grfconfig->GetName());
534  GetString(buffer, STR_NEWGRF_BUGGY, lastof(buffer));
535  DEBUG(grf, 0, "%s", buffer + 3);
536 
537  SetDParam(1, cbid);
538  SetDParam(2, cb_res);
539  GetString(buffer, STR_NEWGRF_BUGGY_UNKNOWN_CALLBACK_RESULT, lastof(buffer));
540  DEBUG(grf, 0, "%s", buffer + 3);
541 }
542 
552 bool ConvertBooleanCallback(const GRFFile *grffile, uint16 cbid, uint16 cb_res)
553 {
554  assert(cb_res != CALLBACK_FAILED); // We do not know what to return
555 
556  if (grffile->grf_version < 8) return cb_res != 0;
557 
558  if (cb_res > 1) ErrorUnknownCallbackResult(grffile->grfid, cbid, cb_res);
559  return cb_res != 0;
560 }
561 
571 bool Convert8bitBooleanCallback(const GRFFile *grffile, uint16 cbid, uint16 cb_res)
572 {
573  assert(cb_res != CALLBACK_FAILED); // We do not know what to return
574 
575  if (grffile->grf_version < 8) return GB(cb_res, 0, 8) != 0;
576 
577  if (cb_res > 1) ErrorUnknownCallbackResult(grffile->grfid, cbid, cb_res);
578  return cb_res != 0;
579 }
580 
581 
583 
589 {
590  assert(this->seq == NULL);
591  assert(source != NULL);
592 
593  size_t count = 1; // 1 for the terminator
594  const DrawTileSeqStruct *element;
595  foreach_draw_tile_seq(element, source) count++;
596 
597  DrawTileSeqStruct *sprites = MallocT<DrawTileSeqStruct>(count);
598  MemCpyT(sprites, source, count);
599  this->seq = sprites;
600 }
601 
607 {
608  this->Clone((const DrawTileSprites*)source);
609 
610  if (source->registers != NULL) {
611  size_t count = 1; // 1 for the ground sprite
612  const DrawTileSeqStruct *element;
613  foreach_draw_tile_seq(element, source->seq) count++;
614 
615  TileLayoutRegisters *regs = MallocT<TileLayoutRegisters>(count);
616  MemCpyT(regs, source->registers, count);
617  this->registers = regs;
618  }
619 }
620 
621 
626 void NewGRFSpriteLayout::Allocate(uint num_sprites)
627 {
628  assert(this->seq == NULL);
629 
630  DrawTileSeqStruct *sprites = CallocT<DrawTileSeqStruct>(num_sprites + 1);
631  sprites[num_sprites].MakeTerminator();
632  this->seq = sprites;
633 }
634 
639 {
640  assert(this->seq != NULL);
641  assert(this->registers == NULL);
642 
643  size_t count = 1; // 1 for the ground sprite
644  const DrawTileSeqStruct *element;
645  foreach_draw_tile_seq(element, this->seq) count++;
646 
647  this->registers = CallocT<TileLayoutRegisters>(count);
648 }
649 
662 uint32 NewGRFSpriteLayout::PrepareLayout(uint32 orig_offset, uint32 newgrf_ground_offset, uint32 newgrf_offset, uint constr_stage, bool separate_ground) const
663 {
664  result_seq.Clear();
665  uint32 var10_values = 0;
666 
667  /* Create a copy of the spritelayout, so we can modify some values.
668  * Also include the groundsprite into the sequence for easier processing. */
669  DrawTileSeqStruct *result = result_seq.Append();
670  result->image = ground;
671  result->delta_x = 0;
672  result->delta_y = 0;
673  result->delta_z = (int8)0x80;
674 
675  const DrawTileSeqStruct *dtss;
676  foreach_draw_tile_seq(dtss, this->seq) {
677  *result_seq.Append() = *dtss;
678  }
680 
681  /* Determine the var10 values the action-1-2-3 chains needs to be resolved for,
682  * and apply the default sprite offsets (unless disabled). */
683  const TileLayoutRegisters *regs = this->registers;
684  bool ground = true;
686  TileLayoutFlags flags = TLF_NOTHING;
687  if (regs != NULL) flags = regs->flags;
688 
689  /* Record var10 value for the sprite */
690  if (HasBit(result->image.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE) || (flags & TLF_SPRITE_REG_FLAGS)) {
691  uint8 var10 = (flags & TLF_SPRITE_VAR10) ? regs->sprite_var10 : (ground && separate_ground ? 1 : 0);
692  SetBit(var10_values, var10);
693  }
694 
695  /* Add default sprite offset, unless there is a custom one */
696  if (!(flags & TLF_SPRITE)) {
697  if (HasBit(result->image.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
698  result->image.sprite += ground ? newgrf_ground_offset : newgrf_offset;
699  if (constr_stage > 0 && regs != NULL) result->image.sprite += GetConstructionStageOffset(constr_stage, regs->max_sprite_offset);
700  } else {
701  result->image.sprite += orig_offset;
702  }
703  }
704 
705  /* Record var10 value for the palette */
706  if (HasBit(result->image.pal, SPRITE_MODIFIER_CUSTOM_SPRITE) || (flags & TLF_PALETTE_REG_FLAGS)) {
707  uint8 var10 = (flags & TLF_PALETTE_VAR10) ? regs->palette_var10 : (ground && separate_ground ? 1 : 0);
708  SetBit(var10_values, var10);
709  }
710 
711  /* Add default palette offset, unless there is a custom one */
712  if (!(flags & TLF_PALETTE)) {
713  if (HasBit(result->image.pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) {
714  result->image.sprite += ground ? newgrf_ground_offset : newgrf_offset;
715  if (constr_stage > 0 && regs != NULL) result->image.sprite += GetConstructionStageOffset(constr_stage, regs->max_palette_offset);
716  }
717  }
718 
719  ground = false;
720  if (regs != NULL) regs++;
721  }
722 
723  return var10_values;
724 }
725 
734 void NewGRFSpriteLayout::ProcessRegisters(uint8 resolved_var10, uint32 resolved_sprite, bool separate_ground) const
735 {
736  DrawTileSeqStruct *result;
737  const TileLayoutRegisters *regs = this->registers;
738  bool ground = true;
740  TileLayoutFlags flags = TLF_NOTHING;
741  if (regs != NULL) flags = regs->flags;
742 
743  /* Is the sprite or bounding box affected by an action-1-2-3 chain? */
744  if (HasBit(result->image.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE) || (flags & TLF_SPRITE_REG_FLAGS)) {
745  /* Does the var10 value apply to this sprite? */
746  uint8 var10 = (flags & TLF_SPRITE_VAR10) ? regs->sprite_var10 : (ground && separate_ground ? 1 : 0);
747  if (var10 == resolved_var10) {
748  /* Apply registers */
749  if ((flags & TLF_DODRAW) && GetRegister(regs->dodraw) == 0) {
750  result->image.sprite = 0;
751  } else {
752  if (HasBit(result->image.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE)) result->image.sprite += resolved_sprite;
753  if (flags & TLF_SPRITE) {
754  int16 offset = (int16)GetRegister(regs->sprite); // mask to 16 bits to avoid trouble
755  if (!HasBit(result->image.sprite, SPRITE_MODIFIER_CUSTOM_SPRITE) || (offset >= 0 && offset < regs->max_sprite_offset)) {
756  result->image.sprite += offset;
757  } else {
758  result->image.sprite = SPR_IMG_QUERY;
759  }
760  }
761 
762  if (result->IsParentSprite()) {
763  if (flags & TLF_BB_XY_OFFSET) {
764  result->delta_x += (int32)GetRegister(regs->delta.parent[0]);
765  result->delta_y += (int32)GetRegister(regs->delta.parent[1]);
766  }
767  if (flags & TLF_BB_Z_OFFSET) result->delta_z += (int32)GetRegister(regs->delta.parent[2]);
768  } else {
769  if (flags & TLF_CHILD_X_OFFSET) result->delta_x += (int32)GetRegister(regs->delta.child[0]);
770  if (flags & TLF_CHILD_Y_OFFSET) result->delta_y += (int32)GetRegister(regs->delta.child[1]);
771  }
772  }
773  }
774  }
775 
776  /* Is the palette affected by an action-1-2-3 chain? */
777  if (result->image.sprite != 0 && (HasBit(result->image.pal, SPRITE_MODIFIER_CUSTOM_SPRITE) || (flags & TLF_PALETTE_REG_FLAGS))) {
778  /* Does the var10 value apply to this sprite? */
779  uint8 var10 = (flags & TLF_PALETTE_VAR10) ? regs->palette_var10 : (ground && separate_ground ? 1 : 0);
780  if (var10 == resolved_var10) {
781  /* Apply registers */
782  if (HasBit(result->image.pal, SPRITE_MODIFIER_CUSTOM_SPRITE)) result->image.pal += resolved_sprite;
783  if (flags & TLF_PALETTE) {
784  int16 offset = (int16)GetRegister(regs->palette); // mask to 16 bits to avoid trouble
785  if (!HasBit(result->image.pal, SPRITE_MODIFIER_CUSTOM_SPRITE) || (offset >= 0 && offset < regs->max_palette_offset)) {
786  result->image.pal += offset;
787  } else {
788  result->image.sprite = SPR_IMG_QUERY;
789  result->image.pal = PAL_NONE;
790  }
791  }
792  }
793  }
794 
795  ground = false;
796  if (regs != NULL) regs++;
797  }
798 }