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Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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source-engine/public/interpolatortypes.cpp

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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================
#include "basetypes.h"
#include "tier1/strtools.h"
#include "interpolatortypes.h"
#include "tier0/dbg.h"
#include "mathlib/mathlib.h"
// memdbgon must be the last include file in a .cpp file!!!
#include "tier0/memdbgon.h"
struct InterpolatorNameMap_t
{
int type;
char const *name;
char const *printname;
};
static InterpolatorNameMap_t g_InterpolatorNameMap[] =
{
{ INTERPOLATE_DEFAULT, "default", "Default" },
{ INTERPOLATE_CATMULL_ROM_NORMALIZEX, "catmullrom_normalize_x", "Catmull-Rom (Norm X)" },
{ INTERPOLATE_EASE_IN, "easein", "Ease In" },
{ INTERPOLATE_EASE_OUT, "easeout", "Ease Out" },
{ INTERPOLATE_EASE_INOUT, "easeinout", "Ease In/Out" },
{ INTERPOLATE_BSPLINE, "bspline", "B-Spline" },
{ INTERPOLATE_LINEAR_INTERP, "linear_interp", "Linear Interp." },
{ INTERPOLATE_KOCHANEK_BARTELS, "kochanek", "Kochanek-Bartels" },
{ INTERPOLATE_KOCHANEK_BARTELS_EARLY, "kochanek_early", "Kochanek-Bartels Early" },
{ INTERPOLATE_KOCHANEK_BARTELS_LATE, "kochanek_late", "Kochanek-Bartels Late" },
{ INTERPOLATE_SIMPLE_CUBIC, "simple_cubic", "Simple Cubic" },
{ INTERPOLATE_CATMULL_ROM, "catmullrom", "Catmull-Rom" },
{ INTERPOLATE_CATMULL_ROM_NORMALIZE, "catmullrom_normalize", "Catmull-Rom (Norm)" },
{ INTERPOLATE_CATMULL_ROM_TANGENT, "catmullrom_tangent", "Catmull-Rom (Tangent)" },
{ INTERPOLATE_EXPONENTIAL_DECAY, "exponential_decay", "Exponential Decay" },
{ INTERPOLATE_HOLD, "hold", "Hold" },
};
int Interpolator_InterpolatorForName( char const *name )
{
for ( int i = 0; i < NUM_INTERPOLATE_TYPES; ++i )
{
InterpolatorNameMap_t *slot = &g_InterpolatorNameMap[ i ];
if ( !Q_stricmp( name, slot->name ) )
return slot->type;
}
Assert( !"Interpolator_InterpolatorForName failed!!!" );
return INTERPOLATE_DEFAULT;
}
char const *Interpolator_NameForInterpolator( int type, bool printname )
{
int i = (int)type;
int c = ARRAYSIZE( g_InterpolatorNameMap );
if ( i < 0 || i >= c )
{
Assert( "!Interpolator_NameForInterpolator: bogus type!" );
// returns "unspecified!!!";
return printname ? g_InterpolatorNameMap[ 0 ].printname : g_InterpolatorNameMap[ 0 ].name;
}
return printname ? g_InterpolatorNameMap[ i ].printname : g_InterpolatorNameMap[ i ].name;
}
//-----------------------------------------------------------------------------
// Purpose:
//-----------------------------------------------------------------------------
struct CurveNameMap_t
{
int type;
int hotkey;
};
static CurveNameMap_t g_CurveNameMap[] =
{
{ CURVE_CATMULL_ROM_TO_CATMULL_ROM, '1' },
{ CURVE_EASE_IN_TO_EASE_OUT, '2' },
{ CURVE_EASE_IN_TO_EASE_IN, '3' },
{ CURVE_EASE_OUT_TO_EASE_OUT, '4' },
{ CURVE_BSPLINE_TO_BSPLINE, '5' },
{ CURVE_LINEAR_INTERP_TO_LINEAR_INTERP, '6' },
{ CURVE_KOCHANEK_BARTELS_TO_KOCHANEK_BARTELS, '7' },
{ CURVE_KOCHANEK_BARTELS_EARLY_TO_KOCHANEK_BARTELS_EARLY, '8' },
{ CURVE_KOCHANEK_BARTELS_LATE_TO_KOCHANEK_BARTELS_LATE, '9' },
{ CURVE_SIMPLE_CUBIC_TO_SIMPLE_CUBIC, '0' },
};
// Turn enum into string and vice versa
int Interpolator_CurveTypeForName( const char *name )
{
char sz[ 128 ];
Q_strncpy( sz, name, sizeof( sz ) );
int leftcurve = 0;
int rightcurve = 0;
int skip = Q_strlen( "curve_" );
if ( !Q_strnicmp( sz, "curve_", skip ) )
{
char *p = sz + skip;
char *second = Q_stristr( p, "_to_curve_" );
char save = *second;
*second = 0;
leftcurve = Interpolator_InterpolatorForName( p );
*second = save;
p = second + Q_strlen( "_to_curve_" );
rightcurve = Interpolator_InterpolatorForName( p );
}
return MAKE_CURVE_TYPE( leftcurve, rightcurve );
}
const char *Interpolator_NameForCurveType( int type, bool printname )
{
static char outname[ 256 ];
int leftside = GET_LEFT_CURVE( type );
int rightside = GET_RIGHT_CURVE( type );
if ( !printname )
{
Q_snprintf( outname, sizeof( outname ), "curve_%s_to_curve_%s",
Interpolator_NameForInterpolator( leftside, printname ),
Interpolator_NameForInterpolator( rightside, printname ) );
}
else
{
Q_snprintf( outname, sizeof( outname ), "%s <-> %s",
Interpolator_NameForInterpolator( leftside, printname ),
Interpolator_NameForInterpolator( rightside, printname ) );
}
return outname;
}
void Interpolator_CurveInterpolatorsForType( int type, int& inbound, int& outbound )
{
inbound = GET_LEFT_CURVE( type );
outbound = GET_RIGHT_CURVE( type );
}
int Interpolator_CurveTypeForHotkey( int key )
{
int c = ARRAYSIZE( g_CurveNameMap );
for ( int i = 0; i < c; ++i )
{
CurveNameMap_t *slot = &g_CurveNameMap[ i ];
if ( slot->hotkey == key )
return slot->type;
}
return -1;
}
void Interpolator_GetKochanekBartelsParams( int interpolationType, float& tension, float& bias, float& continuity )
{
switch ( interpolationType )
{
default:
tension = 0.0f;
bias = 0.0f;
continuity = 0.0f;
Assert( 0 );
break;
case INTERPOLATE_KOCHANEK_BARTELS:
tension = 0.77f;
bias = 0.0f;
continuity = 0.77f;
break;
case INTERPOLATE_KOCHANEK_BARTELS_EARLY:
tension = 0.77f;
bias = -1.0f;
continuity = 0.77f;
break;
case INTERPOLATE_KOCHANEK_BARTELS_LATE:
tension = 0.77f;
bias = 1.0f;
continuity = 0.77f;
break;
}
}
void Interpolator_CurveInterpolate( int interpolationType,
const Vector &vPre,
const Vector &vStart,
const Vector &vEnd,
const Vector &vNext,
float f,
Vector &vOut )
{
vOut.Init();
switch ( interpolationType )
{
default:
Warning( "Unknown interpolation type %d\n",
(int)interpolationType );
// break; // Fall through and use catmull_rom as default
case INTERPOLATE_DEFAULT:
case INTERPOLATE_CATMULL_ROM_NORMALIZEX:
Catmull_Rom_Spline_NormalizeX(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_CATMULL_ROM:
Catmull_Rom_Spline(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_CATMULL_ROM_NORMALIZE:
Catmull_Rom_Spline_Normalize(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_CATMULL_ROM_TANGENT:
Catmull_Rom_Spline_Tangent(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_EASE_IN:
{
f = sin( M_PI * f * 0.5f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_OUT:
{
f = 1.0f - sin( M_PI * f * 0.5f + 0.5f * M_PI );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_INOUT:
{
f = SimpleSpline( f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_LINEAR_INTERP:
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
break;
case INTERPOLATE_KOCHANEK_BARTELS:
case INTERPOLATE_KOCHANEK_BARTELS_EARLY:
case INTERPOLATE_KOCHANEK_BARTELS_LATE:
{
float t, b, c;
Interpolator_GetKochanekBartelsParams( interpolationType, t, b, c );
Kochanek_Bartels_Spline_NormalizeX
(
t, b, c,
vPre,
vStart,
vEnd,
vNext,
f,
vOut
);
}
break;
case INTERPOLATE_SIMPLE_CUBIC:
Cubic_Spline_NormalizeX(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_BSPLINE:
BSpline(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_EXPONENTIAL_DECAY:
{
float dt = vEnd.x - vStart.x;
if ( dt > 0.0f )
{
float val = 1.0f - ExponentialDecay( 0.001, dt, f * dt );
vOut.y = vStart.y + val * ( vEnd.y - vStart.y );
}
else
{
vOut.y = vStart.y;
}
}
break;
case INTERPOLATE_HOLD:
{
vOut.y = vStart.y;
}
break;
}
}
void Interpolator_CurveInterpolate_NonNormalized( int interpolationType,
const Vector &vPre,
const Vector &vStart,
const Vector &vEnd,
const Vector &vNext,
float f,
Vector &vOut )
{
vOut.Init();
switch ( interpolationType )
{
default:
Warning( "Unknown interpolation type %d\n",
(int)interpolationType );
// break; // Fall through and use catmull_rom as default
case INTERPOLATE_CATMULL_ROM_NORMALIZEX:
case INTERPOLATE_DEFAULT:
case INTERPOLATE_CATMULL_ROM:
case INTERPOLATE_CATMULL_ROM_NORMALIZE:
case INTERPOLATE_CATMULL_ROM_TANGENT:
Catmull_Rom_Spline(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_EASE_IN:
{
f = sin( M_PI * f * 0.5f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_OUT:
{
f = 1.0f - sin( M_PI * f * 0.5f + 0.5f * M_PI );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_INOUT:
{
f = SimpleSpline( f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_LINEAR_INTERP:
// Fixme, since this ignores vPre and vNext we could omit computing them aove
VectorLerp( vStart, vEnd, f, vOut );
break;
case INTERPOLATE_KOCHANEK_BARTELS:
case INTERPOLATE_KOCHANEK_BARTELS_EARLY:
case INTERPOLATE_KOCHANEK_BARTELS_LATE:
{
float t, b, c;
Interpolator_GetKochanekBartelsParams( interpolationType, t, b, c );
Kochanek_Bartels_Spline
(
t, b, c,
vPre,
vStart,
vEnd,
vNext,
f,
vOut
);
}
break;
case INTERPOLATE_SIMPLE_CUBIC:
Cubic_Spline(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_BSPLINE:
BSpline(
vPre,
vStart,
vEnd,
vNext,
f,
vOut );
break;
case INTERPOLATE_EXPONENTIAL_DECAY:
{
float dt = vEnd.x - vStart.x;
if ( dt > 0.0f )
{
float val = 1.0f - ExponentialDecay( 0.001, dt, f * dt );
vOut.y = vStart.y + val * ( vEnd.y - vStart.y );
}
else
{
vOut.y = vStart.y;
}
}
break;
case INTERPOLATE_HOLD:
{
vOut.y = vStart.y;
}
break;
}
}
void Interpolator_CurveInterpolate_NonNormalized( int interpolationType,
const Quaternion &vPre,
const Quaternion &vStart,
const Quaternion &vEnd,
const Quaternion &vNext,
float f,
Quaternion &vOut )
{
vOut.Init();
switch ( interpolationType )
{
default:
Warning( "Unknown interpolation type %d\n",
(int)interpolationType );
// break; // Fall through and use catmull_rom as default
case INTERPOLATE_CATMULL_ROM_NORMALIZEX:
case INTERPOLATE_DEFAULT:
case INTERPOLATE_CATMULL_ROM:
case INTERPOLATE_CATMULL_ROM_NORMALIZE:
case INTERPOLATE_CATMULL_ROM_TANGENT:
case INTERPOLATE_KOCHANEK_BARTELS:
case INTERPOLATE_KOCHANEK_BARTELS_EARLY:
case INTERPOLATE_KOCHANEK_BARTELS_LATE:
case INTERPOLATE_SIMPLE_CUBIC:
case INTERPOLATE_BSPLINE:
// FIXME, since this ignores vPre and vNext we could omit computing them aove
QuaternionSlerp( vStart, vEnd, f, vOut );
break;
case INTERPOLATE_EASE_IN:
{
f = sin( M_PI * f * 0.5f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
QuaternionSlerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_OUT:
{
f = 1.0f - sin( M_PI * f * 0.5f + 0.5f * M_PI );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
QuaternionSlerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_EASE_INOUT:
{
f = SimpleSpline( f );
// Fixme, since this ignores vPre and vNext we could omit computing them aove
QuaternionSlerp( vStart, vEnd, f, vOut );
}
break;
case INTERPOLATE_LINEAR_INTERP:
// Fixme, since this ignores vPre and vNext we could omit computing them aove
QuaternionSlerp( vStart, vEnd, f, vOut );
break;
case INTERPOLATE_EXPONENTIAL_DECAY:
vOut.Init();
break;
case INTERPOLATE_HOLD:
{
vOut = vStart;
}
break;
}
}