//
//  KRParticleSystemNewtonian.cpp
//  Kraken Engine
//
//  Copyright 2022 Kearwood Gilbert. All rights reserved.
//  
//  Redistribution and use in source and binary forms, with or without modification, are
//  permitted provided that the following conditions are met:
//  
//  1. Redistributions of source code must retain the above copyright notice, this list of
//  conditions and the following disclaimer.
//  
//  2. Redistributions in binary form must reproduce the above copyright notice, this list
//  of conditions and the following disclaimer in the documentation and/or other materials
//  provided with the distribution.
//  
//  THIS SOFTWARE IS PROVIDED BY KEARWOOD GILBERT ''AS IS'' AND ANY EXPRESS OR IMPLIED
//  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
//  FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KEARWOOD GILBERT OR
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//


#include "KREngine-common.h"
#include "KRParticleSystemNewtonian.h"
#include "KRTexture.h"
#include "KRContext.h"

KRParticleSystemNewtonian::KRParticleSystemNewtonian(KRScene& scene, std::string name) : KRParticleSystem(scene, name)
{
  m_particlesAbsoluteTime = 0.0f;
}

KRParticleSystemNewtonian::~KRParticleSystemNewtonian()
{

}

std::string KRParticleSystemNewtonian::getElementName()
{
  return "newtonian_particles";
}

void KRParticleSystemNewtonian::loadXML(tinyxml2::XMLElement* e)
{
  KRParticleSystem::loadXML(e);
}

tinyxml2::XMLElement* KRParticleSystemNewtonian::saveXML(tinyxml2::XMLNode* parent)
{
  tinyxml2::XMLElement* e = KRParticleSystem::saveXML(parent);
  return e;
}


AABB KRParticleSystemNewtonian::getBounds()
{
  return AABB::Create(-Vector3::One(), Vector3::One(), getModelMatrix());
}

void KRParticleSystemNewtonian::physicsUpdate(float deltaTime)
{
  KRParticleSystem::physicsUpdate(deltaTime);
  m_particlesAbsoluteTime += deltaTime;
}

bool KRParticleSystemNewtonian::hasPhysics()
{
  return true;
}

void KRParticleSystemNewtonian::render(RenderInfo& ri)
{

  if (m_lod_visible <= LOD_VISIBILITY_PRESTREAM) return;

  KRNode::render(ri);

  if (ri.renderPass == KRNode::RENDER_PASS_ADDITIVE_PARTICLES) {
    if (ri.viewport.visible(getBounds())) {
      KRTexture* pParticleTexture = m_pContext->getTextureManager()->getTexture("flare");
      m_pContext->getTextureManager()->selectTexture(0, pParticleTexture, 0.0f, KRTexture::TEXTURE_USAGE_PARTICLE);

      int particle_count = 10000;
      PipelineInfo info{};
      std::string shader_name("dust_particle");
      info.shader_name = &shader_name;
      info.pCamera = ri.camera;
      info.point_lights = &ri.point_lights;
      info.directional_lights = &ri.directional_lights;
      info.spot_lights = &ri.spot_lights;
      info.renderPass = ri.renderPass;
      info.rasterMode = RasterMode::kAdditive;
      info.cullMode = CullMode::kCullNone;
      info.vertexAttributes = (1 << KRMesh::KRENGINE_ATTRIB_VERTEX) | (1 << KRMesh::KRENGINE_ATTRIB_TEXUVA);
      info.modelFormat = ModelFormat::KRENGINE_MODEL_FORMAT_TRIANGLES;

      KRPipeline* pParticleShader = m_pContext->getPipelineManager()->getPipeline(*ri.surface, info);
      pParticleShader->setPushConstant(KRPipeline::PushConstant::flare_size, 1.0f);
      pParticleShader->bind(ri.commandBuffer, *ri.camera, ri.viewport, getModelMatrix(), &ri.point_lights, &ri.directional_lights, &ri.spot_lights, ri.renderPass);

      m_pContext->getMeshManager()->bindVBO(ri.commandBuffer, &m_pContext->getMeshManager()->KRENGINE_VBO_DATA_RANDOM_PARTICLES, 1.0f);

      vkCmdDraw(ri.commandBuffer, particle_count * 3, 1, 0, 0);
    }
  }
}