Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//
//=============================================================================//
#if !defined ( DLIGHTH )
#define DLIGHTH
#ifdef _WIN32
#pragma once
#endif
#include "mathlib/vector.h"
//-----------------------------------------------------------------------------
// Dynamic light structure
//-----------------------------------------------------------------------------
enum
{
DLIGHT_NO_WORLD_ILLUMINATION = 0x1,
DLIGHT_NO_MODEL_ILLUMINATION = 0x2,
// NOTE: These two features are used to dynamically tweak the alpha on displacements
// which is a special effect for selecting which texture to use. If
// we ever change how alpha is stored for displacements, we'll have to kill this feature
DLIGHT_ADD_DISPLACEMENT_ALPHA = 0x4,
DLIGHT_SUBTRACT_DISPLACEMENT_ALPHA = 0x8,
DLIGHT_DISPLACEMENT_MASK = (DLIGHT_ADD_DISPLACEMENT_ALPHA | DLIGHT_SUBTRACT_DISPLACEMENT_ALPHA),
};
// This is the lighting value that is used to determine when something can be
// culle from lighting because it is close enough to black to be virtually black.
//#define MIN_LIGHTING_VALUE (1.0f/256.0f)
// This is the broken value of MIN_LIGHTING_VALUE that we have to take into consideration
// to make sure that the lighting for dlights look the same as they did in HL2.
// We'll use the real MIN_LIGHTING_VALUE above to calculate larger radii for dynamic
// light sources.
//#define HL2_BROKEN_MIN_LIGHTING_VALUE (20.0f/256.0f)
struct dlight_t
{
int flags;
Vector origin;
float radius;
ColorRGBExp32 color; // Light color with exponent
float die; // stop lighting after this time
float decay; // drop this each second
float minlight; // don't add when contributing less
int key;
int style; // lightstyle
// For spotlights. Use m_OuterAngle == 0 for point lights
Vector m_Direction; // center of the light cone
float m_InnerAngle;
float m_OuterAngle;
// see comments above about HL2_BROKEN_MIN_LIGHTING_VALUE and MIN_LIGHTING_VALUE
// THIS SHOULD ONLY GET CALLED FROM THE ENGINE
float GetRadius() const
{
// return FastSqrt( radius * radius * ( HL2_BROKEN_MIN_LIGHTING_VALUE / MIN_LIGHTING_VALUE ) );
return radius;
}
// see comments above about HL2_BROKEN_MIN_LIGHTING_VALUE and MIN_LIGHTING_VALUE
// THIS SHOULD ONLY GET CALLED FROM THE ENGINE
float GetRadiusSquared() const
{
// return radius * radius * ( HL2_BROKEN_MIN_LIGHTING_VALUE / MIN_LIGHTING_VALUE );
return radius * radius;
}
// THIS SHOULD ONLY GET CALLED FROM THE ENGINE
float IsRadiusGreaterThanZero() const
{
// don't bother calculating the new radius if you just want to know if it is greater than zero.
return radius > 0.0f;
}
};
#endif