mirror of https://github.com/OpenTTD/OpenTTD.git
99 lines
2.0 KiB
C
99 lines
2.0 KiB
C
#include "stdafx.h"
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#include <stdarg.h>
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#include "ttd.h"
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#include "sprite.h"
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SpriteGroup *EvalDeterministicSpriteGroup(DeterministicSpriteGroup *dsg, int value)
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{
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int i;
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value >>= dsg->shift_num; // This should bring us to the byte range.
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value &= dsg->and_mask;
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if (dsg->operation != DSG_OP_NONE)
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value += (signed char) dsg->add_val;
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switch (dsg->operation) {
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case DSG_OP_DIV:
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value /= (signed char) dsg->divmod_val;
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break;
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case DSG_OP_MOD:
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value %= (signed char) dsg->divmod_val;
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break;
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case DSG_OP_NONE:
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break;
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}
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for (i = 0; i < dsg->num_ranges; i++) {
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DeterministicSpriteGroupRange *range = &dsg->ranges[i];
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if (range->low <= value && value <= range->high)
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return &range->group;
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}
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return dsg->default_group;
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}
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int GetDeterministicSpriteValue(byte var)
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{
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switch (var) {
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case 0x00:
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return _date;
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case 0x01:
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return _cur_year;
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case 0x02:
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return _cur_month;
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case 0x03:
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return _opt.landscape;
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case 0x09:
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return _date_fract;
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case 0x0A:
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return _tick_counter;
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case 0x0C:
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/* If we got here, it means there was no callback or
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* callbacks aren't supported on our callpath. */
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return 0;
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default:
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return -1;
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}
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}
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SpriteGroup *EvalRandomizedSpriteGroup(RandomizedSpriteGroup *rsg, byte random_bits)
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{
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byte mask;
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byte index;
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/* Noone likes mangling with bits, but you don't get around it here.
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* Sorry. --pasky */
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// rsg->num_groups is always power of 2
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mask = (rsg->num_groups - 1) << rsg->lowest_randbit;
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index = (random_bits & mask) >> rsg->lowest_randbit;
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assert(index < rsg->num_groups);
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return &rsg->groups[index];
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}
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byte RandomizedSpriteGroupTriggeredBits(RandomizedSpriteGroup *rsg,
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byte triggers, byte *waiting_triggers)
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{
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byte match = rsg->triggers & (*waiting_triggers | triggers);
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bool res;
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if (rsg->cmp_mode == RSG_CMP_ANY) {
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res = (match != 0);
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} else { /* RSG_CMP_ALL */
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res = (match == rsg->triggers);
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}
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if (!res) {
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*waiting_triggers |= triggers;
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return 0;
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}
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*waiting_triggers &= ~match;
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return (rsg->num_groups - 1) << rsg->lowest_randbit;
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}
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