// ----------------------------------------------------------------

// From Game Programming in C++ by Sanjay Madhav

// Copyright (C) 2017 Sanjay Madhav. All rights reserved.

//

// Released under the BSD License

// See LICENSE in root directory for full details.

// ----------------------------------------------------------------

#include "SpriteComponent.h"

#include "Texture.h"

#include "Shader.h"

#include "Actor.h"

#include "Game.h"

#include "Renderer.h"

#include "LevelLoader.h"

SpriteComponent::SpriteComponent(Actor* owner, int drawOrder)

:Component(owner)

,mTexture(nullptr)

,mDrawOrder(drawOrder)

,mTexWidth(0)

,mTexHeight(0)

,mVisible(true)

{

mOwner->GetGame()->GetRenderer()->AddSprite(this);

}

SpriteComponent::~SpriteComponent()

{

mOwner->GetGame()->GetRenderer()->RemoveSprite(this);

}

void SpriteComponent::Draw(Shader* shader)

{

if (mTexture)

{

// Scale the quad by the width/height of texture

Matrix4 scaleMat = Matrix4::CreateScale(

static_cast<float>(mTexWidth),

static_cast<float>(mTexHeight),

1.0f);

Matrix4 world = scaleMat * mOwner->GetWorldTransform();

// Since all sprites use the same shader/vertices,

// the game first sets them active before any sprite draws

// Set world transform

shader->SetMatrixUniform("uWorldTransform", world);

// Set current texture

mTexture->SetActive();

// Draw quad

glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, nullptr);

}

}

void SpriteComponent::SetTexture(Texture* texture)

{

mTexture = texture;

// Set width/height

mTexWidth = texture->GetWidth();

mTexHeight = texture->GetHeight();

}

void SpriteComponent::LoadProperties(const rapidjson::Value& inObj)

{

Component::LoadProperties(inObj);

std::string texFile;

if (JsonHelper::GetString(inObj, "textureFile", texFile))

{

SetTexture(mOwner->GetGame()->GetRenderer()->GetTexture(texFile));

}

JsonHelper::GetInt(inObj, "drawOrder", mDrawOrder);

JsonHelper::GetBool(inObj, "visible", mVisible);

}

void SpriteComponent::SaveProperties(rapidjson::Document::AllocatorType& alloc, rapidjson::Value& inObj) const

{

Component::SaveProperties(alloc, inObj);

if (mTexture)

{

JsonHelper::AddString(alloc, inObj, "textureFile", mTexture->GetFileName());

}

JsonHelper::AddInt(alloc, inObj, "drawOrder", mDrawOrder);

JsonHelper::AddBool(alloc, inObj, "visible", mVisible);

}