CL_Support.h

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/*
 * PROPRIETARY INFORMATION.  This software is proprietary to
 * Side Effects Software Inc., and is not to be reproduced,
 * transmitted, or disclosed in any way without written permission.
 *
 * NAME:        CL Library
 *
 * COMMENTS:    Contains helpful utilities and animation functions
 *
*/

#ifndef __CL_ANIMATION_FUNCTIONS_H__
#define __CL_ANIMATION_FUNCTIONS_H__

#include "CL_API.h"
#include <SYS/SYS_Math.h>
#include <SYS/SYS_Types.h>
#include <UT/UT_Assert.h>

#define CL_SUPPORT_ISZERO(x)    ((x) > -0.00001 && (x) < 0.00001)
#define CL_SUPPORT_LERP(weight) (iv + (ov - iv)*weight)

CL_API extern void
CLstretchSlopeAccel(
        fpreal xscale,
        fpreal yscale,
        fpreal &slope,
        fpreal &accel,
        bool accel_ratio);

static inline fpreal
CLease(fpreal t, fpreal t0, fpreal t1)
{
    fpreal rt, dt; // Relative time and total time

    dt = t1 - t0;
    if (CL_SUPPORT_ISZERO(dt))
        return .5;
    rt = (t - t0) / dt;
    return (fpreal).5 - (fpreal).5 * SYScos(M_PI * rt);
}

static inline fpreal
CLeasein(fpreal t, fpreal t0, fpreal t1)
{
    fpreal rt, dt;

    dt = t1 - t0;
    if (CL_SUPPORT_ISZERO(dt))
        return .5;
    rt = (t - t0) / dt;
    return (fpreal)1. - SYScos((M_PI * (fpreal).5) * rt);
}

static inline fpreal
CLeaseout(fpreal t, fpreal t0, fpreal t1)
{
    fpreal rt, dt;

    dt = t1 - t0;
    if (CL_SUPPORT_ISZERO(dt))
        return .5;
    rt = (t - t0) / dt;
    return SYSsin((M_PI * (fpreal).5) * rt);
}

static inline fpreal
CLevalBezier(const fpreal x[], fpreal u)
{
    fpreal u1, u2, u12;

    u1 = (fpreal)1. - u;
    u2 = u * u;
    u12 = u1 * u1;

    return x[0] * u12 * u1 + (fpreal)3. * x[1] * u * u12 + x[3] * u2 * u
           + (fpreal)3. * x[2] * u2 * u1;
}
#endif