#pragma once



#include "common.h"

#include "renderer/device.h"



#define PARTICLES_MAX         512

#define PARTICLE_EMITTERS_MAX 64



struct particle_vertex_t

{

	FLOAT x, y, z;

	DWORD color;

	FLOAT u, v;

};



struct particle_t

{

	particle_vertex_t vertices[4];



	D3DXVECTOR3 position, direction;

	float size, life;

};



struct particle_emitter_t

{

	struct

	{

		texture_h texture;

		vbuffer_h vb;

	} visual;



	particle_t particles[PARTICLES_MAX];

	uint32_t   particles_count;



	D3DXVECTOR3 position, direction;

	float speed[2], life[2], size[2], color[2][3]; // min/max

	float spawn_rate, spawn_last, spawn_time; // spawns per second

};



struct particle_system_t

{

	struct

	{

		ibuffer_h       ib;

		vertex_layout_h vlayout;

		D3DXMATRIX      transform;

	} visual;



	particle_emitter_t emitters[PARTICLE_EMITTERS_MAX];

	uint32_t           emitters_count;

};



struct particle_desc_t

{

	texture_h   texture;

	D3DXVECTOR3 position;

	D3DXVECTOR3 direction;

	float       speed[2];

	float       life[2];

	float       size[2];

	float       color[2][3];

	float       rate;

	float       time;

};



void particle_system_create(particle_system_t *psys);



void particle_system_add(particle_system_t *psys, const particle_desc_t *desc);



void particle_system_update(particle_system_t *psys, const camera_t &camera, float dt);



void particle_system_render(particle_system_t *psys, const camera_t &camera, LPDIRECT3DDEVICE9 device);