106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
/*
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** Command & Conquer Generals Zero Hour(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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// ============================================================================
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// Copyright (C) 2003, 2004 Electronic Arts
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//
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// ParabolicEase.cpp
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// Ease in and out based on a parabolic function.
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// Author: Robert Minsk May 12, 2003
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// ============================================================================
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#include "PreRTS.h" // This must go first in EVERY cpp file in the GameEngine
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#include "GameClient/ParabolicEase.h"
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// ============================================================================
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#ifdef _INTERNAL
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// for occasional debugging...
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// #pragma optimize("", off)
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// #pragma MESSAGE("************************************** WARNING, optimization disabled for debugging purposes")
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#endif // _INTERNAL
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// ============================================================================
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namespace {
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// ============================================================================
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template <typename TYPE>
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inline TYPE
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clamp(TYPE val, TYPE min = TYPE(0), TYPE max = TYPE(1))
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{
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if (val < min) {
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val = min;
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} else if (val > max) {
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val = max;
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}
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return val;
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}
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// ============================================================================
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} // namespace
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// ============================================================================
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void
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ParabolicEase::setEaseTimes(Real easeInTime, Real easeOutTime)
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{
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m_in = easeInTime;
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if (m_in < 0.0f || m_in > 1.0f) {
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DEBUG_CRASH(("Ease-in out of range (in = %g)\n", m_in));
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m_in = clamp(m_in);
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}
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m_out = 1.0f - easeOutTime;
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if (m_out < 0.0f || m_out > 1.0f) {
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DEBUG_CRASH(("Ease-out out of range (out = %g)\n", m_out));
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m_out = clamp(m_out);
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}
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if (m_in > m_out) {
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DEBUG_CRASH(("Ease-in and ease-out overlap (in = %g, out = %g)\n", m_in, m_out));
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m_in = m_out;
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}
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}
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// ----------------------------------------------------------------------------
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Real
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ParabolicEase::operator ()(Real param) const
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{
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if (param < 0.0f || param > 1.0f) {
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DEBUG_CRASH(("Ease-in/ease-out parameter out of range (param = %g)\n", param));
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param = clamp(param);
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}
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#if 0
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const Real v0 = 2.0f/(1.0f + out - in);
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if (param < m_in) {
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// "param < in" avoids a division by zero at param = 0.0f and in = 0.0f
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return v0*param*param/(2.0f*m_in);
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} else if (param <= m_out) {
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// "param <= out" avoid a division by zero when param = 1.0f and out = 1.0f
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return v0*(m_in/2.0f + (param - m_in));
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} else {
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return v0*(m_in/2.0f + (m_out - m_in) +
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(param - m_out + (m_out*m_out - param*param)/2.0f)/(1.0f - m_out));
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}
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#else
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const Real v0 = 1.0f + m_out - m_in;
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if (param < m_in) {
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// "param < in" avoids a division by zero at param = 0.0f and in = 0.0f
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return param*param/(v0*m_in);
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} else if (param <= m_out) {
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// "param <= out" avoid a division by zero when param = 1.0f and out = 1.0f
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return (m_in + 2.0*(param - m_in))/v0;
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} else {
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return (m_in + 2.0*(m_out - m_in) + (2.0*(param - m_out) + m_out*m_out - param*param)/(1.0f - m_out))/v0;
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}
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#endif
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}
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