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

// 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 "MeshComponent.h"

#include "Shader.h"

#include "Mesh.h"

#include "Actor.h"

#include "Game.h"

#include "Renderer.h"

#include "Texture.h"

#include "VertexArray.h"

#include "LevelLoader.h"

MeshComponent::MeshComponent(Actor* owner, bool isSkeletal)

:Component(owner)

,mMesh(nullptr)

,mTextureIndex(0)

,mVisible(true)

,mIsSkeletal(isSkeletal)

{

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

}

MeshComponent::~MeshComponent()

{

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

}

void MeshComponent::Draw(Shader* shader)

{

if (mMesh)

{

// Set the world transform

shader->SetMatrixUniform("uWorldTransform",

mOwner->GetWorldTransform());

// Set specular power

shader->SetFloatUniform("uSpecPower", mMesh->GetSpecPower());

// Set the active texture

Texture* t = mMesh->GetTexture(mTextureIndex);

if (t)

{

t->SetActive();

}

// Set the mesh's vertex array as active

VertexArray* va = mMesh->GetVertexArray();

va->SetActive();

// Draw

glDrawElements(GL_TRIANGLES, va->GetNumIndices(), GL_UNSIGNED_INT, nullptr);

}

}

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

{

Component::LoadProperties(inObj);

std::string meshFile;

if (JsonHelper::GetString(inObj, "meshFile", meshFile))

{

SetMesh(mOwner->GetGame()->GetRenderer()->GetMesh(meshFile));

}

int idx;

if (JsonHelper::GetInt(inObj, "textureIndex", idx))

{

mTextureIndex = static_cast<size_t>(idx);

}

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

JsonHelper::GetBool(inObj, "isSkeletal", mIsSkeletal);

}

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

{

Component::SaveProperties(alloc, inObj);

if (mMesh)

{

JsonHelper::AddString(alloc, inObj, "meshFile", mMesh->GetFileName());

}

JsonHelper::AddInt(alloc, inObj, "textureIndex", static_cast<int>(mTextureIndex));

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

JsonHelper::AddBool(alloc, inObj, "isSkeletal", mIsSkeletal);

}