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#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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struct SpriteGroup *EvalDeterministicSpriteGroup(struct 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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		struct 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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}