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path: root/examples/particle_system/main.cpp
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#include <iostream>

#include "libjin/jin.h"

using namespace std;
using namespace JinEngine::AI;
using namespace JinEngine::Game;
using namespace JinEngine::Math;
using namespace JinEngine::Input;
using namespace JinEngine::Graphics;
using namespace JinEngine::Graphics::Shaders;
using namespace JinEngine::Graphics::Particles;
using namespace JinEngine::Filesystem;
using namespace JinEngine::Time;

ParticleSystem* p;
Timer timer;
Timer::Handler* hnd;
Texture* tex;
Shader* shader;
const char* shader_code = R"(
#VERTEX_SHADER 
Vertex vert(Vertex v) 
{
    return v;
}
#END_VERTEX_SHADER
#FRAGMENT_SHADER 
Color frag(Color col, Texture tex, Vertex v)
{
    Color c = texel(tex, v.uv);
	return c * col;
}
#END_FRAGMENT_SHADER
)";
void onLoad()
{
    tex = Texture::createTexture("smoke.png");
    shader = Shader::createShader(shader_code);
    ParticleSystemDef def;
    def.maxParticleCount = 30;

    def.emitterDef.emitRateDef.rate.rate = 0.5f;
    def.emitterDef.forceDef.force.force = 20.f;
    def.emitterDef.positionDef.position.position = Vector2<float>(200, 200);

    def.emitterDef.directionDef.enableRandom = true;
    def.emitterDef.directionDef.direction.random.floor = 0;
    def.emitterDef.directionDef.direction.random.ceil = 3.14 * 2;

    def.particleDef.colorOverTimeDef.enable = true;
    def.particleDef.colorOverTimeDef.colorStart = Color(255, 255, 255, 255);
    def.particleDef.colorOverTimeDef.colorEnd = Color(255, 255, 255, 0);

    def.particleDef.angularSpeedDef.enableRandom = true;
    def.particleDef.angularSpeedDef.angularSpeed.random.floor = 0.05;
    def.particleDef.angularSpeedDef.angularSpeed.random.ceil = 1;

    def.particleDef.sizeOverTimeDef.enable = true;
    def.particleDef.sizeOverTimeDef.start = 1;
    def.particleDef.sizeOverTimeDef.end = 3;

    def.particleDef.lifeTimeDef.life.life = 5;
    p = new ParticleSystem(def);
    p->setGraphic(tex);
}

void onEvent(Event* e)
{
    static Application* Application = Application::get();
    if (e->type == EventType::QUIT)
        Application->stop();
}

void onUpdate(int ms)
{
    p->update(ms / 1000.f);
    timer.update(ms);
}

void onDraw()
{
    shader->use();
    p->render(50, 50);
    //tex->render(10, 10);
    shader->unuse();
}

int main(int argc, char* argv[])
{
    Application* Application = Application::get();
    Application::Setting setting;
    setting.loader = onLoad;
    setting.eventHandler = onEvent;
    setting.updater = onUpdate;
    setting.drawer = onDraw;
    Application->init(&setting);

    AssetDatabase::get()->mount(".");

    Window* wnd = Window::get();
    Window::Setting wndSetting;
    wndSetting.width = 600;
    wndSetting.height = 512;
    wndSetting.title = "Jin v0.1.1";
    wndSetting.fps = 60;
    wndSetting.vsync = false;
    wndSetting.fullscreen = false;
    wndSetting.resizable = false;
    wndSetting.icon = ".";
    wnd->init(&wndSetting);
    wnd->show();

    Application->run();

    Application->quit();
    wnd->quit();

    return 0;
}