newgrf_spritegroup.cpp

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * 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.
00006  * 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.
00007  * 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/>.
00008  */
00009 
00012 #include "stdafx.h"
00013 #include "newgrf.h"
00014 #include "newgrf_spritegroup.h"
00015 #include "sprite.h"
00016 #include "core/pool_func.hpp"
00017 
00018 SpriteGroupPool _spritegroup_pool("SpriteGroup");
00019 INSTANTIATE_POOL_METHODS(SpriteGroup)
00020 
00021 RealSpriteGroup::~RealSpriteGroup()
00022 {
00023   free((void*)this->loaded);
00024   free((void*)this->loading);
00025 }
00026 
00027 DeterministicSpriteGroup::~DeterministicSpriteGroup()
00028 {
00029   free(this->adjusts);
00030   free(this->ranges);
00031 }
00032 
00033 RandomizedSpriteGroup::~RandomizedSpriteGroup()
00034 {
00035   free((void*)this->groups);
00036 }
00037 
00038 TileLayoutSpriteGroup::~TileLayoutSpriteGroup()
00039 {
00040   free((void*)this->dts->seq);
00041   free(this->dts);
00042 }
00043 
00044 TemporaryStorageArray<uint32, 0x110> _temp_store;
00045 
00046 
00047 static inline uint32 GetVariable(const ResolverObject *object, byte variable, byte parameter, bool *available)
00048 {
00049   /* First handle variables common with Action7/9/D */
00050   uint32 value;
00051   if (GetGlobalVariable(variable, &value)) return value;
00052 
00053   /* Non-common variable */
00054   switch (variable) {
00055     case 0x0C: return object->callback;
00056     case 0x10: return object->callback_param1;
00057     case 0x18: return object->callback_param2;
00058     case 0x1C: return object->last_value;
00059 
00060     case 0x5F: return (object->GetRandomBits(object) << 8) | object->GetTriggers(object);
00061 
00062     case 0x7D: return _temp_store.Get(parameter);
00063 
00064     case 0x7F:
00065       if (object == NULL || object->grffile == NULL || parameter >= object->grffile->param_end) return 0;
00066       return object->grffile->param[parameter];
00067 
00068     /* Not a common variable, so evalute the feature specific variables */
00069     default: return object->GetVariable(object, variable, parameter, available);
00070   }
00071 }
00072 
00073 
00080 static uint32 RotateRight(uint32 val, uint32 rot)
00081 {
00082   /* Do not rotate more than necessary */
00083   rot %= 32;
00084 
00085   return (val >> rot) | (val << (32 - rot));
00086 }
00087 
00088 
00089 /* Evaluate an adjustment for a variable of the given size.
00090  * U is the unsigned type and S is the signed type to use. */
00091 template <typename U, typename S>
00092 static U EvalAdjustT(const DeterministicSpriteGroupAdjust *adjust, ResolverObject *object, U last_value, uint32 value)
00093 {
00094   value >>= adjust->shift_num;
00095   value  &= adjust->and_mask;
00096 
00097   if (adjust->type != DSGA_TYPE_NONE) value += (S)adjust->add_val;
00098 
00099   switch (adjust->type) {
00100     case DSGA_TYPE_DIV:  value /= (S)adjust->divmod_val; break;
00101     case DSGA_TYPE_MOD:  value %= (U)adjust->divmod_val; break;
00102     case DSGA_TYPE_NONE: break;
00103   }
00104 
00105   switch (adjust->operation) {
00106     case DSGA_OP_ADD:  return last_value + value;
00107     case DSGA_OP_SUB:  return last_value - value;
00108     case DSGA_OP_SMIN: return min((S)last_value, (S)value);
00109     case DSGA_OP_SMAX: return max((S)last_value, (S)value);
00110     case DSGA_OP_UMIN: return min((U)last_value, (U)value);
00111     case DSGA_OP_UMAX: return max((U)last_value, (U)value);
00112     case DSGA_OP_SDIV: return value == 0 ? (S)last_value : (S)last_value / (S)value;
00113     case DSGA_OP_SMOD: return value == 0 ? (S)last_value : (S)last_value % (S)value;
00114     case DSGA_OP_UDIV: return value == 0 ? (U)last_value : (U)last_value / (U)value;
00115     case DSGA_OP_UMOD: return value == 0 ? (U)last_value : (U)last_value % (U)value;
00116     case DSGA_OP_MUL:  return last_value * value;
00117     case DSGA_OP_AND:  return last_value & value;
00118     case DSGA_OP_OR:   return last_value | value;
00119     case DSGA_OP_XOR:  return last_value ^ value;
00120     case DSGA_OP_STO:  _temp_store.Store(value, last_value); return last_value;
00121     case DSGA_OP_RST:  return value;
00122     case DSGA_OP_STOP: if (object->psa != NULL) object->psa->Store(value, last_value); return last_value;
00123     case DSGA_OP_ROR:  return RotateRight(last_value, value);
00124     case DSGA_OP_SCMP: return ((S)last_value == (S)value) ? 1 : ((S)last_value < (S)value ? 0 : 2);
00125     case DSGA_OP_UCMP: return ((U)last_value == (U)value) ? 1 : ((U)last_value < (U)value ? 0 : 2);
00126     default:           return value;
00127   }
00128 }
00129 
00130 
00131 const SpriteGroup *DeterministicSpriteGroup::Resolve(ResolverObject *object) const
00132 {
00133   uint32 last_value = 0;
00134   uint32 value = 0;
00135   uint i;
00136 
00137   object->scope = this->var_scope;
00138 
00139   for (i = 0; i < this->num_adjusts; i++) {
00140     DeterministicSpriteGroupAdjust *adjust = &this->adjusts[i];
00141 
00142     /* Try to get the variable. We shall assume it is available, unless told otherwise. */
00143     bool available = true;
00144     if (adjust->variable == 0x7E) {
00145       const SpriteGroup *subgroup = SpriteGroup::Resolve(adjust->subroutine, object);
00146       if (subgroup == NULL) {
00147         value = CALLBACK_FAILED;
00148       } else {
00149         value = subgroup->GetCallbackResult();
00150       }
00151 
00152       /* Reset values to current scope.
00153        * Note: 'last_value' and 'reseed' are shared between the main chain and the procedure */
00154       object->scope = this->var_scope;
00155     } else {
00156       value = GetVariable(object, adjust->variable, adjust->parameter, &available);
00157     }
00158 
00159     if (!available) {
00160       /* Unsupported property: skip further processing and return either
00161        * the group from the first range or the default group. */
00162       return SpriteGroup::Resolve(this->num_ranges > 0 ? this->ranges[0].group : this->default_group, object);
00163     }
00164 
00165     switch (this->size) {
00166       case DSG_SIZE_BYTE:  value = EvalAdjustT<uint8,  int8> (adjust, object, last_value, value); break;
00167       case DSG_SIZE_WORD:  value = EvalAdjustT<uint16, int16>(adjust, object, last_value, value); break;
00168       case DSG_SIZE_DWORD: value = EvalAdjustT<uint32, int32>(adjust, object, last_value, value); break;
00169       default: NOT_REACHED();
00170     }
00171     last_value = value;
00172   }
00173 
00174   object->last_value = last_value;
00175 
00176   if (this->num_ranges == 0) {
00177     /* nvar == 0 is a special case -- we turn our value into a callback result */
00178     if (value != CALLBACK_FAILED) value = GB(value, 0, 15);
00179     static CallbackResultSpriteGroup nvarzero(0);
00180     nvarzero.result = value;
00181     return &nvarzero;
00182   }
00183 
00184   for (i = 0; i < this->num_ranges; i++) {
00185     if (this->ranges[i].low <= value && value <= this->ranges[i].high) {
00186       return SpriteGroup::Resolve(this->ranges[i].group, object);
00187     }
00188   }
00189 
00190   return SpriteGroup::Resolve(this->default_group, object);
00191 }
00192 
00193 
00194 const SpriteGroup *RandomizedSpriteGroup::Resolve(ResolverObject *object) const
00195 {
00196   uint32 mask;
00197   byte index;
00198 
00199   object->scope = this->var_scope;
00200   object->count = this->count;
00201 
00202   if (object->trigger != 0) {
00203     /* Handle triggers */
00204     /* Magic code that may or may not do the right things... */
00205     byte waiting_triggers = object->GetTriggers(object);
00206     byte match = this->triggers & (waiting_triggers | object->trigger);
00207     bool res = (this->cmp_mode == RSG_CMP_ANY) ? (match != 0) : (match == this->triggers);
00208 
00209     if (res) {
00210       waiting_triggers &= ~match;
00211       object->reseed |= (this->num_groups - 1) << this->lowest_randbit;
00212     } else {
00213       waiting_triggers |= object->trigger;
00214     }
00215 
00216     object->SetTriggers(object, waiting_triggers);
00217   }
00218 
00219   mask  = (this->num_groups - 1) << this->lowest_randbit;
00220   index = (object->GetRandomBits(object) & mask) >> this->lowest_randbit;
00221 
00222   return SpriteGroup::Resolve(this->groups[index], object);
00223 }
00224 
00225 
00226 const SpriteGroup *RealSpriteGroup::Resolve(ResolverObject *object) const
00227 {
00228   return object->ResolveReal(object, this);
00229 }

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