This commit is contained in:
wagic.the.homebrew
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/*
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** Haaf's Game Engine 1.7
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** Copyright (C) 2003-2007, Relish Games
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** hge.relishgames.com
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**
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** hgeParticleSystem helper class implementation
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*/
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#include "../../include/JGE.h"
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#include "../../include/JTypes.h"
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#include "../../include/JRenderer.h"
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#include "../../include/JFileSystem.h"
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#include "../../include/hge/hgeparticle.h"
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//HGE *hgeParticleSystem::hge=0;
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/*
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** Haaf's Game Engine 1.7
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** Copyright (C) 2003-2007, Relish Games
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** hge.relishgames.com
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**
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** Core functions implementation: random number generation
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*/
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unsigned int g_seed=0;
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void Random_Seed(int seed)
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{
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if(!seed) g_seed=JGE::GetInstance()->GetTime();
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else g_seed=seed;
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}
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int Random_Int(int min, int max)
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{
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g_seed=214013*g_seed+2531011;
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return min+(g_seed ^ g_seed>>15)%(max-min+1);
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}
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float Random_Float(float min, float max)
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{
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g_seed=214013*g_seed+2531011;
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return min+(g_seed>>16)*(1.0f/65535.0f)*(max-min);
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}
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hgeParticleSystem::hgeParticleSystem(const char *filename, JQuad *sprite)
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{
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//void *psi;
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//hgeParticleSystemInfo psi;
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JFileSystem* fileSys = JFileSystem::GetInstance();
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//hge=hgeCreate(HGE_VERSION);
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//psi=hge->Resource_Load(filename);
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if (!fileSys->OpenFile(filename)) return;
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//if(!psi) return;
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//memcpy(&info, psi, sizeof(hgeParticleSystemInfo));
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//hge->Resource_Free(psi);
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fileSys->ReadFile(&info, sizeof(hgeParticleSystemInfo));
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fileSys->CloseFile();
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info.sprite=sprite;
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// info.fGravityMin *= 100;
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// info.fGravityMax *= 100;
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// info.fSpeedMin *= 100;
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// info.fSpeedMax *= 100;
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vecLocation.x=vecPrevLocation.x=0.0f;
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vecLocation.y=vecPrevLocation.y=0.0f;
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fTx=fTy=0;
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fEmissionResidue=0.0f;
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nParticlesAlive=0;
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fAge=-2.0;
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rectBoundingBox.Clear();
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bUpdateBoundingBox=false;
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}
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hgeParticleSystem::hgeParticleSystem(hgeParticleSystemInfo *psi)
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{
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//hge=hgeCreate(HGE_VERSION);
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memcpy(&info, psi, sizeof(hgeParticleSystemInfo));
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vecLocation.x=vecPrevLocation.x=0.0f;
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vecLocation.y=vecPrevLocation.y=0.0f;
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fTx=fTy=0;
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fEmissionResidue=0.0f;
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nParticlesAlive=0;
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fAge=-2.0;
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rectBoundingBox.Clear();
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bUpdateBoundingBox=false;
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}
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hgeParticleSystem::hgeParticleSystem(const hgeParticleSystem &ps)
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{
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memcpy(this, &ps, sizeof(hgeParticleSystem));
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//hge=hgeCreate(HGE_VERSION);
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}
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void hgeParticleSystem::Update(float fDeltaTime)
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{
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int i;
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float ang;
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hgeParticle *par;
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hgeVector vecAccel, vecAccel2;
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if(fAge >= 0)
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{
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fAge += fDeltaTime;
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if(fAge >= info.fLifetime) fAge = -2.0f;
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}
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mTimer += fDeltaTime;
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if (mTimer < 0.01f)
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return;
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fDeltaTime = mTimer;
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mTimer = 0.0f;
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// update all alive particles
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if(bUpdateBoundingBox) rectBoundingBox.Clear();
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par=particles;
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for(i=0; i<nParticlesAlive; i++)
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{
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par->fAge += fDeltaTime;
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if(par->fAge >= par->fTerminalAge)
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{
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nParticlesAlive--;
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memcpy(par, &particles[nParticlesAlive], sizeof(hgeParticle));
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i--;
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continue;
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}
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vecAccel = par->vecLocation-vecLocation;
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vecAccel.Normalize();
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vecAccel2 = vecAccel;
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vecAccel *= par->fRadialAccel;
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// vecAccel2.Rotate(M_PI_2);
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// the following is faster
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ang = vecAccel2.x;
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vecAccel2.x = -vecAccel2.y;
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vecAccel2.y = ang;
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vecAccel2 *= par->fTangentialAccel;
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par->vecVelocity += (vecAccel+vecAccel2)*fDeltaTime;
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par->vecVelocity.y += par->fGravity*fDeltaTime;
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//par->vecVelocity.y = 0.1f;
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par->vecLocation += par->vecVelocity;
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par->fSpin += par->fSpinDelta*fDeltaTime;
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par->fSize += par->fSizeDelta*fDeltaTime;
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par->colColor += par->colColorDelta*fDeltaTime;
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if(bUpdateBoundingBox) rectBoundingBox.Encapsulate(par->vecLocation.x, par->vecLocation.y);
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par++;
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}
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// generate new particles
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if(fAge != -2.0f)
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{
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float fParticlesNeeded = info.nEmission*fDeltaTime + fEmissionResidue;
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int nParticlesCreated = (unsigned int)fParticlesNeeded;
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fEmissionResidue=fParticlesNeeded-nParticlesCreated;
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par=&particles[nParticlesAlive];
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for(i=0; i<nParticlesCreated; i++)
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{
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if(nParticlesAlive>=MAX_PARTICLES) break;
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par->fAge = 0.0f;
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par->fTerminalAge = Random_Float(info.fParticleLifeMin, info.fParticleLifeMax);
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par->vecLocation = vecPrevLocation+(vecLocation-vecPrevLocation)*Random_Float(0.0f, 1.0f);
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par->vecLocation.x += Random_Float(-2.0f, 2.0f);
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par->vecLocation.y += Random_Float(-2.0f, 2.0f);
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ang=info.fDirection-M_PI_2+Random_Float(0,info.fSpread)-info.fSpread/2.0f;
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if(info.bRelative) ang += (vecPrevLocation-vecLocation).Angle()+M_PI_2;
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par->vecVelocity.x = cosf(ang);
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par->vecVelocity.y = sinf(ang);
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par->vecVelocity *= Random_Float(info.fSpeedMin, info.fSpeedMax);
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par->fGravity = Random_Float(info.fGravityMin, info.fGravityMax);
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par->fRadialAccel = Random_Float(info.fRadialAccelMin, info.fRadialAccelMax);
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par->fTangentialAccel = Random_Float(info.fTangentialAccelMin, info.fTangentialAccelMax);
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par->fSize = Random_Float(info.fSizeStart, info.fSizeStart+(info.fSizeEnd-info.fSizeStart)*info.fSizeVar);
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par->fSizeDelta = (info.fSizeEnd-par->fSize) / par->fTerminalAge;
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par->fSpin = Random_Float(info.fSpinStart, info.fSpinStart+(info.fSpinEnd-info.fSpinStart)*info.fSpinVar);
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par->fSpinDelta = (info.fSpinEnd-par->fSpin) / par->fTerminalAge;
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par->colColor.r = Random_Float(info.colColorStart.r, info.colColorStart.r+(info.colColorEnd.r-info.colColorStart.r)*info.fColorVar);
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par->colColor.g = Random_Float(info.colColorStart.g, info.colColorStart.g+(info.colColorEnd.g-info.colColorStart.g)*info.fColorVar);
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par->colColor.b = Random_Float(info.colColorStart.b, info.colColorStart.b+(info.colColorEnd.b-info.colColorStart.b)*info.fColorVar);
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par->colColor.a = Random_Float(info.colColorStart.a, info.colColorStart.a+(info.colColorEnd.a-info.colColorStart.a)*info.fAlphaVar);
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par->colColorDelta.r = (info.colColorEnd.r-par->colColor.r) / par->fTerminalAge;
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par->colColorDelta.g = (info.colColorEnd.g-par->colColor.g) / par->fTerminalAge;
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par->colColorDelta.b = (info.colColorEnd.b-par->colColor.b) / par->fTerminalAge;
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par->colColorDelta.a = (info.colColorEnd.a-par->colColor.a) / par->fTerminalAge;
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if(bUpdateBoundingBox) rectBoundingBox.Encapsulate(par->vecLocation.x, par->vecLocation.y);
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nParticlesAlive++;
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par++;
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}
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}
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vecPrevLocation=vecLocation;
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}
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void hgeParticleSystem::MoveTo(float x, float y, bool bMoveParticles)
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{
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int i;
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float dx,dy;
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if(bMoveParticles)
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{
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dx=x-vecLocation.x;
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dy=y-vecLocation.y;
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for(i=0;i<nParticlesAlive;i++)
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{
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particles[i].vecLocation.x += dx;
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particles[i].vecLocation.y += dy;
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}
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vecPrevLocation.x=vecPrevLocation.x + dx;
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vecPrevLocation.y=vecPrevLocation.y + dy;
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}
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else
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{
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if(fAge==-2.0) { vecPrevLocation.x=x; vecPrevLocation.y=y; }
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else { vecPrevLocation.x=vecLocation.x; vecPrevLocation.y=vecLocation.y; }
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}
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vecLocation.x=x;
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vecLocation.y=y;
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}
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void hgeParticleSystem::FireAt(float x, float y)
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{
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Stop();
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MoveTo(x,y);
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Fire();
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}
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void hgeParticleSystem::Fire()
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{
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mTimer = 0.0f;
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if(info.fLifetime==-1.0f) fAge=-1.0f;
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else fAge=0.0f;
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}
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void hgeParticleSystem::Stop(bool bKillParticles)
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{
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fAge=-2.0f;
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if(bKillParticles)
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{
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nParticlesAlive=0;
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rectBoundingBox.Clear();
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}
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}
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void hgeParticleSystem::Render()
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{
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int i;
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// DWORD col;
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hgeParticle *par=particles;
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//col=info.sprite->GetColor();
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for(i=0; i<nParticlesAlive; i++)
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{
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info.sprite->SetColor(par->colColor.GetHWColor());
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JRenderer::GetInstance()->RenderQuad(info.sprite, par->vecLocation.x+fTx, par->vecLocation.y+fTy, par->fSpin*par->fAge, par->fSize, par->fSize);
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par++;
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}
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//info.sprite->SetColor(col);
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}
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