mirror of
https://github.com/AquariaOSE/Aquaria.git
synced 2024-11-29 12:03:51 +00:00
347 lines
6.6 KiB
C++
347 lines
6.6 KiB
C++
/*
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Copyright (C) 2007, 2010 - Bit-Blot
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This file is part of Aquaria.
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Aquaria is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "Particles.h"
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#include "RenderBase.h"
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Emitter::Emitter(ParticleEffect *pe) : Quad(), pe(pe)
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{
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//HACK:
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cull = false;
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hasRot = false;
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}
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void Emitter::destroy()
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{
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for (Particles::iterator i = particles.begin(); i != particles.end(); i++)
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{
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(*i)->active = false;
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(*i)->emitter = 0;
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}
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particles.clear();
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Quad::destroy();
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}
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void Emitter::spawnParticle(float perc)
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{
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Particle *p = particleManager->getFreeParticle(this);
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p->active = true;
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p->life = data.life;
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setBlendType(data.blendType);
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width = data.width;
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height = data.height;
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p->color = data.color;
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p->alpha = data.alpha;
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p->vel += data.initialVelocity;
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p->gvy = data.gravity;
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p->scale = data.scale;
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p->rot = data.rotation;
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p->pos = lastSpawn + ((currentSpawn - lastSpawn) * perc);
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int finalRadius = data.randomSpawnRadius;
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if (data.randomSpawnRadiusRange > 0)
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finalRadius += rand()%data.randomSpawnRadiusRange;
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switch (data.spawnArea)
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{
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case SpawnParticleData::SPAWN_CIRCLE:
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{
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float a = rand()%360;
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p->pos += Vector(sinf(a)*finalRadius * data.randomSpawnMod.x, cosf(a)*finalRadius * data.randomSpawnMod.y);
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}
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break;
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case SpawnParticleData::SPAWN_LINE:
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{
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if (rand()%2 == 0)
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p->pos.x += finalRadius;
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else
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p->pos.x -= finalRadius;
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}
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break;
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}
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if (data.randomScale1 == 1 && data.randomScale1 == data.randomScale2)
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{
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}
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else
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{
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int r = rand()%(int(data.randomScale2*100) - int(data.randomScale1*100));
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float sz = data.randomScale1 + float(r)/100.0f;
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p->scale = Vector(sz,sz);
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}
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if (data.randomRotationRange > 0)
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{
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p->rot.z = rand()%int(data.randomRotationRange);
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p->rot.ensureData();
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p->rot.data->target.z += p->rot.z;
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}
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if (data.randomVelocityMagnitude > 0)
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{
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float a = rand()%data.randomVelocityRange;
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Vector v = Vector(sinf(a)*data.randomVelocityMagnitude, cosf(a)*data.randomVelocityMagnitude);
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p->vel += v;
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}
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if (data.copyParentRotation)
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{
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p->rot.z = getAbsoluteRotation().z;
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}
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}
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Vector Emitter::getSpawnPosition()
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{
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if (!data.spawnLocal)
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return pe->getWorldPosition();
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return Vector(0,0);
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}
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void Emitter::onUpdate(float dt)
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{
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Quad::onUpdate(dt);
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if (pe->isRunning() && core->particlesPaused <= data.pauseLevel)
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{
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if (data.spawnTimeOffset > 0)
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{
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data.spawnTimeOffset -= dt;
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if (data.spawnTimeOffset > 0)
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return;
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}
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int spawnCount;
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float spawnPerc;
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if (data.justOne)
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{
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if (data.didOne)
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spawnCount = 0;
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else
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spawnCount = data.justOne;
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spawnPerc = 1;
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data.didOne = 1;
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}
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else if (data.useSpawnRate)
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{
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spawnCount = 0;
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spawnPerc = 1;
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data.counter += dt;
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while (data.counter > data.spawnRate.x) // Faster than division
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{
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data.counter -= data.spawnRate.x;
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spawnCount++;
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}
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}
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else
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{
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float num = data.number.x * dt;
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num += data.lastDTDifference;
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spawnCount = int(num);
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data.lastDTDifference = num - float(spawnCount);
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if (spawnCount > 0)
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spawnPerc = 1.0f / float(spawnCount);
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}
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if (spawnCount > 0)
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{
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// Avoid calling this until we know we actually need it for
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// generating a particle (it has to apply the matrix chain,
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// which is slow).
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currentSpawn = getSpawnPosition();
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if (lastSpawn.isZero())
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lastSpawn = currentSpawn;
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for (; spawnCount > 0; spawnCount--)
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{
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spawnParticle(spawnPerc);
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}
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lastSpawn = currentSpawn;
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}
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data.number.update(dt);
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data.velocityMagnitude.update(dt);
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data.spawnOffset.update(dt);
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}
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}
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void Emitter::start()
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{
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data.didOne = 0;
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lastSpawn = getSpawnPosition();
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}
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void Emitter::stop()
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{
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}
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void Emitter::addParticle(Particle *p)
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{
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particles.push_front(p);
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}
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void Emitter::removeParticle(Particle *p)
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{
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if (particles.back() == p)
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{
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particles.pop_back();
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}
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else
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particles.remove(p);
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}
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void Emitter::onRender(const RenderState& rs) const
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{
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if (particles.empty()) return;
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if (!data.spawnLocal)
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{
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glLoadIdentity();
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core->setupRenderPositionAndScale();
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}
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float w2 = width*0.5f;
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float h2 = height*0.5f;
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if (texture)
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texture->apply();
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if (hasRot)
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{
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Vector colorMult = data.inheritColor ? pe->color : Vector(1, 1, 1);
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float alphaMult = data.inheritAlpha ? pe->alpha.x : 1;
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for (Particles::const_iterator i = particles.begin(); i != particles.end(); i++)
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{
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Particle *p = *i;
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if (p->active)
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{
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const float dx = w2 * p->scale.x;
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const float dy = h2 * p->scale.y;
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Vector col = p->color * colorMult;
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glColor4f(col.x, col.y, col.z, p->alpha.x * alphaMult);
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if (p->rot.z != 0 || p->rot.isInterpolating())
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{
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glPushMatrix();
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glTranslatef(p->pos.x, p->pos.y,0);
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glRotatef(p->rot.z, 0, 0, 1);
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if (data.flipH || (data.copyParentFlip && (pe->isfh() || (pe->getParent() && pe->getParent()->isfh()))))
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{
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glRotatef(180, 0, 1, 0);
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}
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glBegin(GL_QUADS);
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glTexCoord2f(0,1);
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glVertex2f(-dx, +dy);
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glTexCoord2f(1,1);
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glVertex2f(+dx, +dy);
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glTexCoord2f(1,0);
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glVertex2f(+dx, -dy);
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glTexCoord2f(0,0);
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glVertex2f(-dx, -dy);
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glEnd();
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glPopMatrix();
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}
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else
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{
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const float x = p->pos.x;
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const float y = p->pos.y;
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glBegin(GL_QUADS);
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glTexCoord2f(0,1);
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glVertex2f(x-dx, y+dy);
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glTexCoord2f(1,1);
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glVertex2f(x+dx, y+dy);
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glTexCoord2f(1,0);
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glVertex2f(x+dx, y-dy);
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glTexCoord2f(0,0);
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glVertex2f(x-dx, y-dy);
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glEnd();
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}
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}
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}
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}
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else
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{
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glBegin(GL_QUADS);
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for (Particles::const_iterator i = particles.begin(); i != particles.end(); i++)
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{
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Particle *p = *i;
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if (p->active)
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{
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const float x = p->pos.x;
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const float y = p->pos.y;
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const float dx = w2 * p->scale.x;
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const float dy = h2 * p->scale.y;
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glColor4f(p->color.x, p->color.y, p->color.z, p->alpha.x);
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glTexCoord2f(0,1);
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glVertex2f(x-dx, y+dy);
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glTexCoord2f(1,1);
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glVertex2f(x+dx, y+dy);
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glTexCoord2f(1,0);
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glVertex2f(x+dx, y-dy);
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glTexCoord2f(0,0);
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glVertex2f(x-dx, y-dy);
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}
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}
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glEnd();
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}
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}
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