TombEngine/TR5Main/Game/drip.cpp

#include "framework.h"
#include "drip.h"
#include <d3d11.h>
#include <SimpleMath.h>
#include "control.h"
#include "level.h"
#include "room.h"
#include "trmath.h"
namespace T5M {
	namespace Effects {
		namespace Drip {
			using namespace DirectX::SimpleMath;

			std::array<DripParticle, 128> dripParticles;
			constexpr Vector4 DRIP_COLOR = Vector4(1, 1, 1, 1);
			void UpdateDrips()
			{
				for (int i = 0; i < dripParticles.size(); i++) {
					DripParticle& d = dripParticles[i];
					if (!d.active) continue;
					d.age++;
					if (d.age > DRIP_LIFE)
						d.active = false;
					d.velocity.y += d.gravity;
					if (Rooms[d.room].flags & ENV_FLAG_WIND) {
						d.velocity.x = SmokeWindX / 2;
						d.velocity.z = SmokeWindZ / 2;
					}
					d.pos += d.velocity;
					float normalizedAge = d.age / DRIP_LIFE;
					d.color = Vector4::Lerp(DRIP_COLOR, Vector4::Zero, normalizedAge);
					d.height = lerp(DRIP_WIDTH / 0.15625, 0, normalizedAge);
					short room = d.room;
					FLOOR_INFO* floor = GetFloor(d.pos.x, d.pos.y, d.pos.z, &room);
					int floorheight = floor->floor;
					if (d.pos.y > floorheight)
						d.active = false;

				}
			}

			DripParticle& getFreeDrip()
			{
				for (int i = 0; i < dripParticles.size(); i++)
				{
					if (!dripParticles[i].active)
						return dripParticles[i];
				}
				return dripParticles[0];
			}

			void SpawnDrip(Vector3 pos, int room)
			{
				DripParticle& d = getFreeDrip();
				d = {};
				d.active = true;
				d.pos = pos;
				d.room = room;
				d.gravity = frandMinMax(3, 6);
			}

		}
	}
}