TombEngine/TR5Main/Game/spark.cpp

#pragma once
#include "framework.h"
#include "spark.h"
#include <array>
#include <Game\trmath.h>
using namespace DirectX::SimpleMath;

namespace T5M {
	namespace Effects {
		namespace Spark {
			std::array<SparkParticle, 64> SparkParticles;
			void UpdateSparkParticles()
			{
				for (int i = 0; i < SparkParticles.size(); i++) {
					SparkParticle& s = SparkParticles[i];
					if (!s.active)continue;
					s.age += 1;
					if (s.age > s.life) {
						s.active = false;
						continue;
					}
					s.velocity.y += s.gravity;
					s.velocity *= s.friction;
					s.pos += s.velocity;
					float normalizedLife = s.age / s.life;
					s.height = lerp(s.width / 0.15625, 0, normalizedLife);
					s.color = DirectX::SimpleMath::Vector4::Lerp(s.sourceColor, s.destinationColor, normalizedLife);
				}
			}

			SparkParticle& getFreeSparkParticle()
			{
				for (int i = 0; i < SparkParticles.size(); i++)
				{
					if (!SparkParticles[i].active) {
						return SparkParticles[i];
					}
				}
				return SparkParticles[0];
			}

			void TriggerFlareSparkParticles(PHD_VECTOR* pos, PHD_VECTOR* vel, CVECTOR* color,int room)
			{
				SparkParticle& s = getFreeSparkParticle();
				s = {};
				s.age = 0;
				s.life = frand() * 10 + 10;
				s.friction = 0.98f;
				s.gravity = 1.2f;
				s.width = 8;
				s.room = room;
				s.pos = Vector3(pos->x, pos->y, pos->z);
				Vector3 v = Vector3(vel->x, vel->y, vel->z);
				v += Vector3(frandMinMax(-64, 64), frandMinMax(-64, 64), frandMinMax(-64, 64));
				v.Normalize(v);
				s.velocity = v *frandMinMax(17,24);
				s.sourceColor = Vector4(1, 1, 1, 1);
				s.destinationColor = Vector4(color->r/255.0f,color->g/255.0f,color->b/255.0f,1);
				s.active = true;
			}

		}
	}
}