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155 lines
3.8 KiB
C++
155 lines
3.8 KiB
C++
/*
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** gl_cycler.cpp
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** Implements the cycler for dynamic lights and texture shaders.
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**
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**---------------------------------------------------------------------------
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** Copyright 2003 Timothy Stump
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** Copyright 2006 Christoph Oelckers
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions
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** are met:
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**
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** 1. Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** 2. Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** 3. The name of the author may not be used to endorse or promote products
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** derived from this software without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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**---------------------------------------------------------------------------
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**
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*/
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#include <math.h>
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#include "gl/utility/gl_cycler.h"
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FCycler::Serialize(FArchive & arc)
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{
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arc << m_start << m_end << m_current
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<< m_time << m_cycle << m_increment << m_shouldCycle
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<< m_cycleType;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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FCycler::FCycler()
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{
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m_cycle = 0.f;
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m_cycleType = CYCLE_Linear;
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m_shouldCycle = false;
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m_start = m_current = 0.f;
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m_end = 0.f;
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m_increment = true;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FCycler::SetParams(float start, float end, float cycle)
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{
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m_cycle = cycle;
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m_time = 0.f;
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m_start = m_current = start;
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m_end = end;
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m_increment = true;
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}
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//==========================================================================
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//
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//
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//
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//==========================================================================
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void FCycler::Update(float diff)
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{
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float mult, angle;
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float step = m_end - m_start;
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if (!m_shouldCycle)
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{
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return;
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}
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m_time += diff;
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if (m_time >= m_cycle)
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{
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m_time = m_cycle;
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}
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mult = m_time / m_cycle;
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switch (m_cycleType)
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{
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case CYCLE_Linear:
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if (m_increment)
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{
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m_current = m_start + (step * mult);
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}
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else
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{
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m_current = m_end - (step * mult);
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}
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break;
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case CYCLE_Sin:
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angle = float(M_PI * 2.f * mult);
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mult = sinf(angle);
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mult = (mult + 1.f) / 2.f;
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m_current = m_start + (step * mult);
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break;
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case CYCLE_Cos:
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angle = float(M_PI * 2.f * mult);
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mult = cosf(angle);
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mult = (mult + 1.f) / 2.f;
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m_current = m_start + (step * mult);
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break;
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case CYCLE_SawTooth:
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m_current = m_start + (step * mult);
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break;
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case CYCLE_Square:
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if (m_increment)
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{
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m_current = m_start;
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}
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else
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{
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m_current = m_end;
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}
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break;
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}
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if (m_time == m_cycle)
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{
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m_time = 0.f;
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m_increment = !m_increment;
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}
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}
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