cpp/openttd-patchpack/source Files · sprite.c

Files @ r2008:5e435ad4c8e4

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Location: cpp/openttd-patchpack/source/sprite.c

r2008:5e435ad4c8e4 2.0 KiB text/x-c Show Annotation Show as Raw Download as Raw

hackykid

(svn r2516) - Feature: [pbs] Implement path-based-signalling. This allows multiple trains within the same signal block, provided their paths dont intersect. For this the block must have all exit and entry signals be pbs signals. Place these by ctrl-clicking 4 times on a normal signal.
- Feature: [pbs] Implement autoplacement of pbs blocks, when a block has an entry and an exit pbs signal, covert the entire block to pbs. Can be turned off in the patch settings.
- Feature: [pbs] Allow showing of reserved status by making the tracks darker, when the pbs debug level is at least 1.

#include "stdafx.h"

#include <stdarg.h>

#include "openttd.h"
#include "sprite.h"


SpriteGroup *EvalDeterministicSpriteGroup(DeterministicSpriteGroup *dsg, int value)
{
	int i;

	value >>= dsg->shift_num; // This should bring us to the byte range.
	value &= dsg->and_mask;

	if (dsg->operation != DSG_OP_NONE)
		value += (signed char) dsg->add_val;

	switch (dsg->operation) {
		case DSG_OP_DIV:
			value /= (signed char) dsg->divmod_val;
			break;
		case DSG_OP_MOD:
			value %= (signed char) dsg->divmod_val;
			break;
		case DSG_OP_NONE:
			break;
	}

	for (i = 0; i < dsg->num_ranges; i++) {
		DeterministicSpriteGroupRange *range = &dsg->ranges[i];

		if (range->low <= value && value <= range->high)
			return &range->group;
	}

	return dsg->default_group;
}

int GetDeterministicSpriteValue(byte var)
{
	switch (var) {
		case 0x00:
			return _date;
		case 0x01:
			return _cur_year;
		case 0x02:
			return _cur_month;
		case 0x03:
			return _opt.landscape;
		case 0x09:
			return _date_fract;
		case 0x0A:
			return _tick_counter;
		case 0x0C:
			/* If we got here, it means there was no callback or
			 * callbacks aren't supported on our callpath. */
			return 0;
		default:
			return -1;
	}
}

SpriteGroup *EvalRandomizedSpriteGroup(RandomizedSpriteGroup *rsg, byte random_bits)
{
	byte mask;
	byte index;

	/* Noone likes mangling with bits, but you don't get around it here.
	 * Sorry. --pasky */
	// rsg->num_groups is always power of 2
	mask = (rsg->num_groups - 1) << rsg->lowest_randbit;
	index = (random_bits & mask) >> rsg->lowest_randbit;
	assert(index < rsg->num_groups);
	return &rsg->groups[index];
}

byte RandomizedSpriteGroupTriggeredBits(RandomizedSpriteGroup *rsg,
	byte triggers, byte *waiting_triggers)
{
	byte match = rsg->triggers & (*waiting_triggers | triggers);
	bool res;

	if (rsg->cmp_mode == RSG_CMP_ANY) {
		res = (match != 0);
	} else { /* RSG_CMP_ALL */
		res = (match == rsg->triggers);
	}

	if (!res) {
		*waiting_triggers |= triggers;
		return 0;
	}

	*waiting_triggers &= ~match;

	return (rsg->num_groups - 1) << rsg->lowest_randbit;
}