//////////////////////////////////////////////////////////////////////////////////////////////////
// 
// File: d3dutility.h
// 
// Author: Frank Luna (C) All Rights Reserved
//
// System: AMD Athlon 1800+ XP, 512 DDR, Geforce 3, Windows XP, MSVC++ 7.0 
//
// Desc: Provides utility functions for simplifying common tasks.
//          
//////////////////////////////////////////////////////////////////////////////////////////////////

#ifndef __d3dUtilityH__
#define __d3dUtilityH__

#include <d3dx9.h>
#include <string>
#include <limits>

namespace d3d
{
	//
	// Init
	//
	bool InitD3D(
		HINSTANCE hInstance,       // [in] Application instance.
		int width, int height,     // [in] Backbuffer dimensions.
		bool windowed,             // [in] Windowed (true)or full screen (false).
		D3DDEVTYPE deviceType,     // [in] HAL or REF
		IDirect3DDevice9** device);// [out]The created device.

	int EnterMsgLoop( 
		bool (*ptr_display)(float timeDelta));

	LRESULT CALLBACK WndProc(
		HWND hwnd,
		UINT msg, 
		WPARAM wParam,
		LPARAM lParam);

	//
	// Cleanup
	//
	template<class T> void Release(T t)
	{
		if( t )
		{
			t->Release();
			t = 0;
		}
	}
		
	template<class T> void Delete(T t)
	{
		if( t )
		{
			delete t;
			t = 0;
		}
	}

	//
	// Colors
	//
	const D3DXCOLOR      WHITE( D3DCOLOR_XRGB(255, 255, 255) );
	const D3DXCOLOR      BLACK( D3DCOLOR_XRGB(  0,   0,   0) );
	const D3DXCOLOR        RED( D3DCOLOR_XRGB(255,   0,   0) );
	const D3DXCOLOR      GREEN( D3DCOLOR_XRGB(  0, 255,   0) );
	const D3DXCOLOR       BLUE( D3DCOLOR_XRGB(  0,   0, 255) );
	const D3DXCOLOR     YELLOW( D3DCOLOR_XRGB(255, 255,   0) );
	const D3DXCOLOR       CYAN( D3DCOLOR_XRGB(  0, 255, 255) );
	const D3DXCOLOR    MAGENTA( D3DCOLOR_XRGB(255,   0, 255) );

	const D3DXCOLOR BEACH_SAND( D3DCOLOR_XRGB(255, 249, 157) );
	const D3DXCOLOR DESERT_SAND( D3DCOLOR_XRGB(250, 205, 135) );

	const D3DXCOLOR LIGHTGREEN( D3DCOLOR_XRGB( 60, 184, 120) );
	const D3DXCOLOR  PUREGREEN( D3DCOLOR_XRGB(  0, 166,  81) );
	const D3DXCOLOR  DARKGREEN( D3DCOLOR_XRGB(  0, 114,  54) );

	const D3DXCOLOR LIGHT_YELLOW_GREEN( D3DCOLOR_XRGB(124, 197, 118) );
	const D3DXCOLOR  PURE_YELLOW_GREEN( D3DCOLOR_XRGB( 57, 181,  74) );
	const D3DXCOLOR  DARK_YELLOW_GREEN( D3DCOLOR_XRGB( 25, 123,  48) );

	const D3DXCOLOR LIGHTBROWN(D3DCOLOR_XRGB(198, 156, 109));
	const D3DXCOLOR DARKBROWN( D3DCOLOR_XRGB(115, 100,  87));

	//
	// Lights
	//

	D3DLIGHT9 InitDirectionalLight(D3DXVECTOR3* direction, D3DXCOLOR* color);
	D3DLIGHT9 InitPointLight(D3DXVECTOR3* position, D3DXCOLOR* color);
	D3DLIGHT9 InitSpotLight(D3DXVECTOR3* position, D3DXVECTOR3* direction, D3DXCOLOR* color);

	//
	// Materials
	//

	D3DMATERIAL9 InitMtrl(D3DXCOLOR a, D3DXCOLOR d, D3DXCOLOR s, D3DXCOLOR e, float p);

	const D3DMATERIAL9 WHITE_MTRL  = InitMtrl(WHITE, WHITE, WHITE, BLACK, 2.0f);
	const D3DMATERIAL9 RED_MTRL    = InitMtrl(RED, RED, RED, BLACK, 2.0f);
	const D3DMATERIAL9 GREEN_MTRL  = InitMtrl(GREEN, GREEN, GREEN, BLACK, 2.0f);
	const D3DMATERIAL9 BLUE_MTRL   = InitMtrl(BLUE, BLUE, BLUE, BLACK, 2.0f);
	const D3DMATERIAL9 YELLOW_MTRL = InitMtrl(YELLOW, YELLOW, YELLOW, BLACK, 2.0f);

	//
	// Bounding Objects
	//

	struct BoundingBox
	{
		BoundingBox();

		bool isPointInside(D3DXVECTOR3& p);

		D3DXVECTOR3 _min;
		D3DXVECTOR3 _max;
	};

	struct BoundingSphere
	{
		BoundingSphere();

		D3DXVECTOR3 _center;
		float       _radius;
	};

	//
	// Constants
	//

	const float INFINITY = FLT_MAX;
	const float EPSILON  = 0.001f;

	//
	// Drawing
	//

	// Function references "desert.bmp" internally.  This file must
	// be in the working directory.
	bool DrawBasicScene(
		IDirect3DDevice9* device,// Pass in 0 for cleanup.
		float scale);            // uniform scale 

	//
	// Vertex Structures
	//

	struct Vertex
	{
		Vertex(){}
		Vertex(float x, float y, float z, 
			float nx, float ny, float nz,
			float u, float v)
		{
			_x  = x;  _y  = y;  _z  = z;
			_nx = nx; _ny = ny; _nz = nz;
			_u  = u;  _v  = v;
		}
		float _x, _y, _z;
		float _nx, _ny, _nz;
		float _u, _v;

		static const DWORD FVF;
	};

	//
	// Randomness
	//

	// Desc: Return random float in [lowBound, highBound] interval.
	float GetRandomFloat(float lowBound, float highBound);
	

	// Desc: Returns a random vector in the bounds specified by min and max.
	void GetRandomVector(
		D3DXVECTOR3* out,
		D3DXVECTOR3* min,
		D3DXVECTOR3* max);

	//
	// Conversion
	//
	DWORD FtoDw(float f);

	//
	// Interpolation
	//

	float Lerp(float a, float b, float t);
}

#endif // __d3dUtilityH__