TombEngine/TR5Main/Game/particle/SimpleParticle.cpp

#include "framework.h"
#include "Game/particle/SimpleParticle.h"

#include "Game/items.h"
#include "Specific/trmath.h"
#include "Specific/setup.h"
#include "Specific/prng.h"

using namespace TEN::Math::Random;

namespace TEN::Effects
{
	std::array<SimpleParticle, 15> simpleParticles;
	SimpleParticle& getFreeSimpleParticle()
	{
		for (auto& p : simpleParticles)
			if (!p.active)
				return p;

		return simpleParticles[0];
	}

	void TriggerSnowmobileSnow(ITEM_INFO* snowMobile)
	{
		float angle = TO_RAD(snowMobile->Position.yRot);
		const float angleVariation = GenerateFloat(-10, 10) * RADIAN;
		float x = std::sin(angle + angleVariation);
		float z = std::cos(angle + angleVariation);
		x = x* -500 + snowMobile->Position.xPos;
		z = z* -500 + snowMobile->Position.zPos;
		SimpleParticle& p = getFreeSimpleParticle();
		p = {};
		p.active = true;
		p.life = GenerateFloat(8, 14);
		p.room = snowMobile->RoomNumber;
		p.ageRate = GenerateFloat(0.9, 1.3);
		float size = GenerateFloat(96, 128);
		p.worldPosition = {x, float(snowMobile->Position.yPos) - size / 2 , z};
		p.sequence = ID_SKIDOO_SNOW_TRAIL_SPRITES;
		p.size = GenerateFloat(256, 512);
	}

	void TriggerSpeedboatFoam(ITEM_INFO* boat)
	{
		for (float i = -0.5; i < 1; i += 1)
		{
			float angle = TO_RAD(boat->Position.yRot);
			float angleVariation = i*2*10 * RADIAN;
			float x = std::sin(angle + angleVariation);
			float z = std::cos(angle + angleVariation);
			x = x * -700 + boat->Position.xPos;
			z = z * -700 + boat->Position.zPos;
			SimpleParticle& p = getFreeSimpleParticle();
			p = {};
			p.active = true;
			p.life = GenerateFloat(5, 9);
			p.room = boat->RoomNumber;
			p.ageRate = GenerateFloat(0.9, 1.3);
			float size = GenerateFloat(96, 128);
			p.worldPosition = { x, float(boat->Position.yPos) - size / 2, z };
			p.sequence = ID_MOTOR_BOAT_FOAM_SPRITES;
			p.size = GenerateFloat(256, 512);
		}
	}

	void updateSimpleParticles()
	{
		for (auto& p : simpleParticles)
		{
			if (!p.active)
				continue;

			p.age+= p.ageRate;
			if (p.life < p.age)
				p.active = false;

			int numSprites = -Objects[p.sequence].nmeshes - 1;
			float normalizedAge = p.age / p.life;
			p.sprite = lerp(0, numSprites, normalizedAge);
		}
	}
}