//========================================================================
// File: Material.cpp - stores texture and material information for D3D9 and D3D11
//
// Part of the GameCode4 Application
//
// GameCode4 is the sample application that encapsulates much of the source code
// discussed in "Game Coding Complete - 4th Edition" by Mike McShaffry and David
// "Rez" Graham, published by Charles River Media. 
// ISBN-10: 1133776574 | ISBN-13: 978-1133776574
//
// If this source code has found it's way to you, and you think it has helped you
// in any way, do the authors a favor and buy a new copy of the book - there are 
// detailed explanations in it that compliment this code well. Buy a copy at Amazon.com
// by clicking here: 
//    http://www.amazon.com/gp/product/1133776574/ref=olp_product_details?ie=UTF8&me=&seller=
//
// There's a companion web site at http://www.mcshaffry.com/GameCode/
// 
// The source code is managed and maintained through Google Code: 
//    http://code.google.com/p/gamecode4/
//
// (c) Copyright 2012 Michael L. McShaffry and David Graham
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser GPL v3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
// http://www.gnu.org/licenses/lgpl-3.0.txt for more details.
//
// You should have received a copy of the GNU Lesser GPL v3
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
//========================================================================

#include "Material.h"
#include <SDL3_image/SDL_image.h>

////////////////////////////////////////////////////
// class Material						- Chapter 14, page 486
////////////////////////////////////////////////////

Material::Material()
{
	m_Diffuse  = g_White;
	m_Ambient  = Color(0.10f, 0.10f, 0.10f, 1.0f);
	m_Specular = g_White;
	m_Emissive = g_Black;
	m_Power    = 0;
}

void Material::SetAmbient(const Color &color)
{
	m_Ambient = color;
}

void Material::SetDiffuse(const Color &color)
{
	m_Diffuse = color;
}

void Material::SetSpecular(const Color &color, const float power)
{
	m_Specular = color;
	m_Power    = power;
}

void Material::SetEmissive(const Color &color)
{
	m_Emissive = color;
}

void Material::SetAlpha(const float alpha)
{
	m_Diffuse.a = alpha;
}

void Material::D3Use9()
{
	// [munnellg] noop on linux
	// DXUTGetD3D9Device()->SetMaterial( &m_D3DMaterial );	
}

//
// class DdsResourceLoader					- creates an interface with the Resource cache to load DDS files
//
class DdsResourceLoader : public TextureResourceLoader
{
public:
	virtual std::string VGetPattern() { return "*.dds"; }
};

std::shared_ptr<IResourceLoader> CreateDDSResourceLoader()
{
	return std::shared_ptr<IResourceLoader>(GCC_NEW DdsResourceLoader());
}

//
// class JpgResourceLoader					- creates an interface with the Resource cache to load JPG files
//
class JpgResourceLoader : public TextureResourceLoader
{
public:
	virtual std::string VGetPattern() { return "*.jpg"; }
};

std::shared_ptr<IResourceLoader> CreateJPGResourceLoader()
{
	return std::shared_ptr<IResourceLoader>(GCC_NEW JpgResourceLoader());
}

OpenGLTextureResourceExtraData::OpenGLTextureResourceExtraData()
	: m_texture_id(0)
{
}

OpenGLTextureResourceExtraData::~OpenGLTextureResourceExtraData()
{
	glDeleteTextures(1, &m_texture_id);	
}

unsigned int TextureResourceLoader::VGetLoadedResourceSize(char *rawBuffer, unsigned int rawSize)
{
	// This will keep the resource cache from allocating memory for the texture, so DirectX / OpenGL can manage it on it's own.
	return 0;
}

bool TextureResourceLoader::VLoadResource(char *rawBuffer, unsigned int rawSize, std::shared_ptr<ResHandle> handle)
{
	std::shared_ptr<OpenGLTextureResourceExtraData> extra = std::shared_ptr<OpenGLTextureResourceExtraData>(GCC_NEW OpenGLTextureResourceExtraData);
	
	SDL_IOStream* rw = SDL_IOFromConstMem(rawBuffer, rawSize);
	if (!rw)
	{
		GCC_ERROR(SDL_GetError());
		return false;
	}

	SDL_Surface *surface = IMG_Load_IO(rw, 0);
	if (!surface) {
		GCC_ERROR(SDL_GetError());
		return false;
	}

	SDL_Surface *formattedSurface = SDL_ConvertSurface(surface, SDL_PIXELFORMAT_RGBA32);
	SDL_DestroySurface(surface);

	if (!formattedSurface)
	{
		GCC_ERROR(SDL_GetError());
		return false;
	}

	glGenTextures(1, &(extra->m_texture_id));
	glBindTexture(GL_TEXTURE_2D, extra->m_texture_id);
	glTexImage2D(
		GL_TEXTURE_2D,
		0,
		GL_RGBA,
		formattedSurface->w,
		formattedSurface->h,
		0,
		GL_RGBA,
		GL_UNSIGNED_BYTE,
		formattedSurface->pixels
	);

	SDL_DestroySurface(formattedSurface);

	// set texture parameters
	glGenerateMipmap(GL_TEXTURE_2D);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	// glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	// glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

	GLfloat maxAnisotropy = 0.0f;
	glGetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY, &maxAnisotropy); 
	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY, maxAnisotropy);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	
	glBindTexture(GL_TEXTURE_2D, 0);

	handle->SetExtra(extra);

	return true;
}