www.pudn.com > SkyBox.zip > SkyClouds.cpp

//----------------------------------------------------------------------------- 
// 
// @doc 
// 
// @module	SkyClouds.cpp - Sky body | 
// 
// This module contains the support for the sky cloud. 
// 
// Copyright (c) 1999 - Descartes Systems Sciences, Inc. 
// 
// @end 
// 
// $History: DcComEngGenConfigurePage.h $ 
// 
//----------------------------------------------------------------------------- 
 
#include "stdafx.h" 
#include "SkyClouds.h" 
#include "../_CoreLib/Utility.h" 
#include "RenderGlobals.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#undef THIS_FILE 
static char THIS_FILE[] = __FILE__; 
#endif 
 
// 
// Force all render code into own seg 
// 
 
#pragma code_seg ("renderer_segment") 
 
//----------------------------------------------------------------------------- 
// 
// @mfunc  constructor. 
// 
// @rdesc None. 
// 
//----------------------------------------------------------------------------- 
 
CSkyClouds::CSkyClouds ()  
{ 
	// 
	// Initialize 
	// 
} 
 
//----------------------------------------------------------------------------- 
// 
// @mfunc  destructor. 
// 
// @rdesc None. 
// 
//----------------------------------------------------------------------------- 
 
CSkyClouds::~CSkyClouds ()  
{ 
	// 
	// Rundown 
	// 
} 
 
//----------------------------------------------------------------------------- 
// 
// @mfunc Create the sky body 
// 
// @parm _Type | nType | Type of sky cloud 
// 
// @parm const char * | pszTexture | Name of the texture 
// 
// @parm const CVector2 & | vRate | Shift rate of the texture (per day) 
// 
// @parm float | fScale | Scale of the texture 
// 
// @parm const CVector3 & | vDayColor | Color of the clouds during the day 
// 
// @parm const CVector3 & | vNightColor | Color of the clouds during the night 
// 
// @parm float | fTransitionExp | Transition exponent.  Controls how quickly 
//		the transition is between day to night or night to day. 
// 
// @rdesc None. 
// 
//----------------------------------------------------------------------------- 
 
void CSkyClouds::Create (_Type nType, const char *pszTexture,  
		const CVector2 &vRate, float fScale, const CVector3 &vDayColor,  
		const CVector3 &vNightColor, float fTransitionExp)  
{ 
 
	// 
	// Initialize the variables 
	// 
 
	m_nType = nType; 
	m_strTexture = pszTexture; 
	m_vRate = vRate; 
	m_fScale = fScale; 
	m_vBaseDayColor = vDayColor; 
	m_vBaseNightColor = vNightColor; 
	m_fTransitionExp = fTransitionExp; 
} 
 
//----------------------------------------------------------------------------- 
// 
// @mfunc Compute the position of the sky body 
// 
// @parm float | fTimeInDays | The current time in days 
// 
// @parm float | fDayFactor | Factor of the day.  0 = night, 1 = day 
// 
// @rdesc None. 
// 
//----------------------------------------------------------------------------- 
 
void CSkyClouds::ComputePosition (float fTimeInDays, float fDayFactor) 
{ 
 
	// 
	// Compute the shift 
	// 
 
	m_vOffset = m_vRate * fTimeInDays; 
 
	// 
	// Adjust the factor 
	// 
 
	if (m_fTransitionExp != 1.0f) 
	{ 
		fDayFactor = pow (fDayFactor, m_fTransitionExp); 
	} 
 
	// 
	// Set the day color 
	// 
 
	CVector3 vDelta = m_vBaseDayColor - m_vBaseNightColor; 
	m_vCurrentColor = m_vBaseNightColor + vDelta * fDayFactor; 
} 
 
//----------------------------------------------------------------------------- 
// 
// @mfunc Prepare a sky cloud 
// 
//		Prepare a sky cloud. 
// 
// @rdesc None. 
// 
//----------------------------------------------------------------------------- 
 
void CSkyClouds::Prep () 
{ 
 
	// 
	// Load the texture 
	// 
 
	const char *pszTexture = GetTextureName (); 
	SetTextureIndex (g_sTextureManager .FindNormalN (pszTexture)); 
}