TombEngine/TR5Main/Game/footprint.cpp

#include "framework.h"
#include "footprint.h"
#include "control.h"
#include "lara.h"
#include "draw.h"
#include "groundfx.h"
#include "level.h"
#include "items.h"
namespace T5M {
	namespace Effects {
		namespace Footprints {
			using std::deque;
			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);
				if (!(floor->fx == GroundMaterial::Ice || floor->fx == GroundMaterial::Sand || floor->fx == GroundMaterial::Mud)) {
					return false;
				}
				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;
			}
			void updateFootprints()
			{
				if (footprints.size() == 0) {
					return;
				}
				int numInvalidFootprints = 0;
				for (auto i = footprints.begin(); i != footprints.end(); i++) {
					FOOTPRINT_STRUCT& footprint = *i;
					footprint.life--;
					if (footprint.life <= 0) {
						numInvalidFootprints++;
						continue;
					}
					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;
					}
				}
				for (int i = 0; i < numInvalidFootprints; i++) {
					footprints.pop_back();
				}
			}

		}
	}
}