//***********************************************************************//
//																		 //
//		- "Talk to me like I'm a 3 year old!" Programming Lessons -		 //
//                                                                       //
//		$Author:		DigiBen		digiben@gametutorials.com			 //
//																		 //
//		$Program:		MD2 Loader										 //
//																		 //
//		$Description:	Demonstrates how to load a Quake2 MD2 Model		 //
//																		 //
//		$Date:			2/6/02											 //
//																		 //
//***********************************************************************//

// This is a compiler directive that includes libraries (For Visual Studio)
// You can manually include the libraries in the "Project->settings" menu under
// the "Link" tab.  You need these libraries to compile this program.
#pragma comment(lib, "opengl32.lib")
#pragma comment(lib, "glu32.lib")
#pragma comment(lib, "glaux.lib")

#include "main.h"										// This includes our header file
#include "Md2.h"										// Include the MD2 header file.

bool  g_bFullScreen = true;								// Set full screen as default
HWND  g_hWnd;											// This is the handle for the window
RECT  g_rRect;											// This holds the window dimensions
HDC   g_hDC;											// General HDC - (handle to device context)
HGLRC g_hRC;											// General OpenGL_DC - Our Rendering Context for OpenGL
HINSTANCE g_hInstance;									// This holds the global hInstance for UnregisterClass() in DeInit()

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// This tutorial will demonstrate how to load a .Md2 file.  This 3D file format
// was created for Quake2 character models with key frame animation.  
// If you have any desire to create your own file, I suggest finding MilkShape 3D.
// This program allows you to import and export almost every popular 3D format,
// along with the ability to use it as a modeler.  It's a $20 shareware program,
// you can't beat that!  I chose the .Md2 format after viewing the internet and
// see the countless characters already on the internet for free download.
// This is good news for programmers that don't have art programs or can't
// do any art.  All the animations and weapons are done for you!  This is a
// great start to learning animation as well, since the Quake formats are so
// simple it makes me shed a tear of joy.  This tutorial only loads the model,
// where as the next tutorial will show how to do key frame animation using
// interpolation.  Next, we will tackle skeletal animation with the famous
// Quake3 .Md3 format.  This makes learning animation easy because it isn't
// complicated by a $3000 modeler.  Plus, there are hundreds of models out
// there on the internet to test and put in your own games (with permission of course).
// The best place to find models is at www.planetquake.com.  Usually there are
// featured models weekly to download.
//
// Since there is no animation for the model, we just have it spinning in the
// center of the screen.  The controls are: 
//
// Left Mouse Button - Changes the Render mode from normal to wireframe.
// Right Mouse Button - Turns lighting On/Off
// Left Arrow Key - Spins the model to the left
// Right Arrow Key - Spins the model to the right
// Escape - Quits
//
// If you decide to go find models you might find them in a format like .pk3.
// This is just a .zip format, so rename it to .zip and unzip it.  There should
// be .Md2 and texture files.  I think the textures are normally in .pcx, so you
// will have to save them as BMP's to run in here.
//
//
//
//

#define FILE_NAME  "tris.md2"							// This is the 3D file we will load.
#define TEXTURE_NAME "hobgoblin.bmp"

UINT g_Texture[MAX_TEXTURES] = {0};						// This holds the texture info, referenced by an ID

CLoadMD2 g_LoadMd2;										// This is MD2 class.  This should go in a good model class.
t3DModel g_3DModel;										// This holds the 3D Model info that we load in

int   g_ViewMode	  = GL_TRIANGLES;					// We want the default drawing mode to be normal
bool  g_bLighting     = true;							// Turn lighting on initially
float g_RotateX		  = 0.0f;							// This is the current value at which the model is rotated
float g_RotationSpeed = 0.5f;							// This is the speed that our model rotates.  (-speed rotates left)

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///////////////////////////////// INIT GAME WINDOW \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*
/////
/////	This function initializes the game window.
/////
///////////////////////////////// INIT GAME WINDOW \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*

void Init(HWND hWnd)
{
	g_hWnd = hWnd;										// Assign the window handle to a global window handle
	GetClientRect(g_hWnd, &g_rRect);					// Assign the windows rectangle to a global RECT
	InitializeOpenGL(g_rRect.right, g_rRect.bottom);	// Init OpenGL with the global rect

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	// First we need to actually load the .MD2 file.  We just pass in an address to
	// our t3DModel structure and the file name string we want to load ("tris.md2").
	// We also need to give the texture name we will be using.  This is because there
	// are usually a lot of textures with each character.  You choose the best one.
	// It seems that all of the Quake2 characters .md2 files are called: "tris.md2"

	g_LoadMd2.ImportMD2(&g_3DModel, FILE_NAME, TEXTURE_NAME);		

	// There is no color information for these models, as well as only one
	// texture.  If everything goes well, it should load the TEXTURE_NAME file.

	// Go through all the materials
	for(int i = 0; i < g_3DModel.numOfMaterials; i++)
	{
		// Check to see if there is a file name to load in this material
		if(strlen(g_3DModel.pMaterials[i].strFile) > 0)
		{
			// Use the name of the texture file to load the bitmap, with a texture ID (i).
			// We pass in our global texture array, the name of the texture, and an ID to reference it.	
			CreateTexture(g_Texture, g_3DModel.pMaterials[i].strFile, i);			
		}

		// Set the texture ID for this material
		g_3DModel.pMaterials[i].texureId = i;
	}

	// Here, we turn on a lighting and enable lighting.  We don't need to
	// set anything else for lighting because we will just take the defaults.
	// We also want color, so we turn that on

	glEnable(GL_LIGHT0);								// Turn on a light with defaults set
	glEnable(GL_LIGHTING);								// Turn on lighting
	glEnable(GL_COLOR_MATERIAL);						// Allow color

	// To make our model render somewhat faster, we do some front back culling.
	// It seems that Quake2 orders their polygons clock-wise.

	glEnable(GL_CULL_FACE);								// Turn culling on
	glCullFace(GL_FRONT);								// Quake2 uses front face culling apparently

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}


///////////////////////////////// MAIN GAME LOOP \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*
/////
/////	This function Handles the main game loop
/////
///////////////////////////////// MAIN GAME LOOP \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*

WPARAM MainLoop()
{
	MSG msg;

	while(1)											// Do our infinate loop
	{													// Check if there was a message
		if (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 
        { 
			if(msg.message == WM_QUIT)					// If the message wasnt to quit
				break;
            TranslateMessage(&msg);						// Find out what the message does
            DispatchMessage(&msg);						// Execute the message
        }
		else											// if there wasn't a message
		{ 
			RenderScene();								// Update the screen	
        } 
	}

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	// When we are done, we need to free all the model data
	// We do this by walking through all the objects and freeing their information

	// Go through all the objects in the scene
	for(int i = 0; i < g_3DModel.numOfObjects; i++)
	{
		// Free the faces, normals, vertices, and texture coordinates.
		if(g_3DModel.pObject[i].pFaces)		delete [] g_3DModel.pObject[i].pFaces;
		if(g_3DModel.pObject[i].pNormals)	delete [] g_3DModel.pObject[i].pNormals;
		if(g_3DModel.pObject[i].pVerts)		delete [] g_3DModel.pObject[i].pVerts;
		if(g_3DModel.pObject[i].pTexVerts)	delete [] g_3DModel.pObject[i].pTexVerts;
	}

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	DeInit();											// Clean up and free all allocated memory

	return(msg.wParam);									// Return from the program
}

///////////////////////////////// RENDER SCENE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*
/////
/////	This function renders the entire scene.
/////
///////////////////////////////// RENDER SCENE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*

void RenderScene()