TombEngine/TR5Main/Game/footprint.cpp

#include "footprint.h"
#include "control.h"
#include "lara.h"

std::deque<FOOTPRINT_STRUCT> footprints = deque<FOOTPRINT_STRUCT>();
bool CheckFootOnFloor(ITEM_INFO& const item, int mesh, PHD_3DPOS& outFootprintPosition){
	int x = item.pos.xPos;
	int y = item.pos.yPos;
	int z = item.pos.zPos;
	short roomNumber = item.roomNumber;
	FLOOR_INFO* floor = GetFloor(x, y, z, &roomNumber);
	int height = GetFloorHeight(floor, x, y, z);
	int diff;
	PHD_VECTOR pos;
	pos.x = pos.z = 0;
	pos.y = FOOT_HEIGHT_OFFSET;
	GetLaraJointPosition(&pos, mesh);
	outFootprintPosition.xPos = pos.x;
	outFootprintPosition.zPos = pos.z;
	outFootprintPosition.yPos = height-1;
	outFootprintPosition.yRot = item.pos.yRot;
	return	abs(pos.y - height) < 32;
}

int getFootprintIndexWithLowestLife()
{
	int lowestLife = footprints[0].life;
	int index = 0;
	for (int i = 1; i < MAX_FOOTPRINTS; i++) {
		if (!footprints[i].active) {
			index = i;
			break;
		}
		if (footprints[i].life < lowestLife) {
			index = i;
		}
	}
	return index;
}

void updateFootprints()
{
	if (footprints.size() == 0) {
		return;
	}
	for (auto i = footprints.begin(); i != footprints.end(); i++) {
		FOOTPRINT_STRUCT& footprint = *i;
		footprint.life--;
		if (footprint.life <= 0) {
			footprints.pop_back();
		}
		if (footprint.life > footprint.lifeStartFading) {
			footprint.opacity = footprint.startOpacity;
		}
		else {
			float opacity = lerp(0, footprint.startOpacity, fmax(0, fmin(1, footprint.life / (float)footprint.lifeStartFading)));
			footprint.opacity = opacity;
		}
	}
}