diff options
Diffstat (limited to 'archive/hgehelp/hgeparticle.cpp')
| -rw-r--r-- | archive/hgehelp/hgeparticle.cpp | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/archive/hgehelp/hgeparticle.cpp b/archive/hgehelp/hgeparticle.cpp new file mode 100644 index 0000000..d0d054d --- /dev/null +++ b/archive/hgehelp/hgeparticle.cpp @@ -0,0 +1,311 @@ +// PLEASE NOTE that this is not the 1.81 version of hgeparticle.cpp ... +// the game I'm working on used an older HGE that breaks with the 1.81 +// particle system. If you want 1.81, add the "byteswap" stuff to it. --ryan. + +/* +** Haaf's Game Engine 1.61 +** Copyright (C) 2003-2007, Relish Games +** hge.relishgames.com +** +** hgeParticleSystem helper class implementation +*/ + + +#include "hgeparticle.h" + +HGE *hgeParticleSystem::hge=0; + +hgeParticleSystem::hgeParticleSystem(const char *filename, hgeSprite *sprite, float fps) +{ + void *psi; + + hge=hgeCreate(HGE_VERSION); + + psi=hge->Resource_Load(filename); + if(!psi) return; + + char *ptr = (char *) psi; + memset(&info, '\0', sizeof (info)); + info.sprite = sprite; + ptr += 4; // skip these bytes. + +#ifdef WIN32 +#define BYTESWAP(a) +#endif + #define SETMEMBER(typ, x) \ + { info.x = *((const typ *) ptr); ptr += sizeof (typ); BYTESWAP(info.x); } + SETMEMBER(int, nEmission); + SETMEMBER(float, fLifetime); + SETMEMBER(float, fParticleLifeMin); + SETMEMBER(float, fParticleLifeMax); + SETMEMBER(float, fDirection); + SETMEMBER(float, fSpread); + SETMEMBER(BYTE, bRelative); + ptr += 3; // padding. + SETMEMBER(float, fSpeedMin); + SETMEMBER(float, fSpeedMax); + SETMEMBER(float, fGravityMin); + SETMEMBER(float, fGravityMax); + SETMEMBER(float, fRadialAccelMin); + SETMEMBER(float, fRadialAccelMax); + SETMEMBER(float, fTangentialAccelMin); + SETMEMBER(float, fTangentialAccelMax); + SETMEMBER(float, fSizeStart); + SETMEMBER(float, fSizeEnd); + SETMEMBER(float, fSizeVar); + SETMEMBER(float, fSpinStart); + SETMEMBER(float, fSpinEnd); + SETMEMBER(float, fSpinVar); + SETMEMBER(float, colColorStart.r); + SETMEMBER(float, colColorStart.g); + SETMEMBER(float, colColorStart.b); + SETMEMBER(float, colColorStart.a); + SETMEMBER(float, colColorEnd.r); + SETMEMBER(float, colColorEnd.g); + SETMEMBER(float, colColorEnd.b); + SETMEMBER(float, colColorEnd.a); + SETMEMBER(float, fColorVar); + SETMEMBER(float, fAlphaVar); + #undef SETMEMBER + + hge->Resource_Free(psi); + + vecLocation.x=vecPrevLocation.x=0.0f; + vecLocation.y=vecPrevLocation.y=0.0f; + fTx=fTy=0; + + fEmissionResidue=0.0f; + nParticlesAlive=0; + fAge=-2.0; + if(fps!=0.0f) fUpdSpeed=1.0f/fps; + else fUpdSpeed=0.0f; + fResidue=0.0f; + + rectBoundingBox.Clear(); + bUpdateBoundingBox=false; +} + +hgeParticleSystem::hgeParticleSystem(hgeParticleSystemInfo *psi, float fps) +{ + hge=hgeCreate(HGE_VERSION); + + memcpy(&info, psi, sizeof(hgeParticleSystemInfo)); + + vecLocation.x=vecPrevLocation.x=0.0f; + vecLocation.y=vecPrevLocation.y=0.0f; + fTx=fTy=0; + + fEmissionResidue=0.0f; + nParticlesAlive=0; + fAge=-2.0; + if(fps!=0.0f) fUpdSpeed=1.0f/fps; + else fUpdSpeed=0.0f; + fResidue=0.0f; + + rectBoundingBox.Clear(); + bUpdateBoundingBox=false; +} + +hgeParticleSystem::hgeParticleSystem(const hgeParticleSystem &ps) +{ + memcpy(this, &ps, sizeof(hgeParticleSystem)); + hge=hgeCreate(HGE_VERSION); +} + +void hgeParticleSystem::Update(float fDeltaTime) +{ + if(fUpdSpeed==0.0f) _update(fDeltaTime); + else + { + fResidue+=fDeltaTime; + if(fResidue>=fUpdSpeed) + { + _update(fUpdSpeed); + while(fResidue>=fUpdSpeed) fResidue-=fUpdSpeed; + } + } +} + +void hgeParticleSystem::_update(float fDeltaTime) +{ + int i; + float ang; + hgeParticle *par; + hgeVector vecAccel, vecAccel2; + + if(fAge >= 0) + { + fAge += fDeltaTime; + if(fAge >= info.fLifetime) fAge = -2.0f; + } + + // update all alive particles + + if(bUpdateBoundingBox) rectBoundingBox.Clear(); + par=particles; + + for(i=0; i<nParticlesAlive; i++) + { + par->fAge += fDeltaTime; + if(par->fAge >= par->fTerminalAge) + { + nParticlesAlive--; + memcpy(par, &particles[nParticlesAlive], sizeof(hgeParticle)); + i--; + continue; + } + + vecAccel = par->vecLocation-vecLocation; + vecAccel.Normalize(); + vecAccel2 = vecAccel; + vecAccel *= par->fRadialAccel; + + // vecAccel2.Rotate(M_PI_2); + // the following is faster + ang = vecAccel2.x; + vecAccel2.x = -vecAccel2.y; + vecAccel2.y = ang; + + vecAccel2 *= par->fTangentialAccel; + par->vecVelocity += (vecAccel+vecAccel2)*fDeltaTime; + par->vecVelocity.y += par->fGravity*fDeltaTime; + + par->vecLocation += par->vecVelocity; + + par->fSpin += par->fSpinDelta*fDeltaTime; + par->fSize += par->fSizeDelta*fDeltaTime; + par->colColor += par->colColorDelta*fDeltaTime; + + if(bUpdateBoundingBox) rectBoundingBox.Encapsulate(par->vecLocation.x, par->vecLocation.y); + + par++; + } + + // generate new particles + + if(fAge != -2.0f) + { + float fParticlesNeeded = info.nEmission*fDeltaTime + fEmissionResidue; + int nParticlesCreated = (unsigned int)fParticlesNeeded; + fEmissionResidue=fParticlesNeeded-nParticlesCreated; + + par=&particles[nParticlesAlive]; + + for(i=0; i<nParticlesCreated; i++) + { + if(nParticlesAlive>=MAX_PARTICLES) break; + + par->fAge = 0.0f; + par->fTerminalAge = hge->Random_Float(info.fParticleLifeMin, info.fParticleLifeMax); + + par->vecLocation = vecPrevLocation+(vecLocation-vecPrevLocation)*hge->Random_Float(0.0f, 1.0f); + par->vecLocation.x += hge->Random_Float(-2.0f, 2.0f); + par->vecLocation.y += hge->Random_Float(-2.0f, 2.0f); + + ang=info.fDirection-M_PI_2+hge->Random_Float(0,info.fSpread)-info.fSpread/2.0f; + if(info.bRelative) ang += (vecPrevLocation-vecLocation).Angle()+M_PI_2; + par->vecVelocity.x = cosf(ang); + par->vecVelocity.y = sinf(ang); + par->vecVelocity *= hge->Random_Float(info.fSpeedMin, info.fSpeedMax); + + par->fGravity = hge->Random_Float(info.fGravityMin, info.fGravityMax); + par->fRadialAccel = hge->Random_Float(info.fRadialAccelMin, info.fRadialAccelMax); + par->fTangentialAccel = hge->Random_Float(info.fTangentialAccelMin, info.fTangentialAccelMax); + + par->fSize = hge->Random_Float(info.fSizeStart, info.fSizeStart+(info.fSizeEnd-info.fSizeStart)*info.fSizeVar); + par->fSizeDelta = (info.fSizeEnd-par->fSize) / par->fTerminalAge; + + par->fSpin = hge->Random_Float(info.fSpinStart, info.fSpinStart+(info.fSpinEnd-info.fSpinStart)*info.fSpinVar); + par->fSpinDelta = (info.fSpinEnd-par->fSpin) / par->fTerminalAge; + + par->colColor.r = hge->Random_Float(info.colColorStart.r, info.colColorStart.r+(info.colColorEnd.r-info.colColorStart.r)*info.fColorVar); + par->colColor.g = hge->Random_Float(info.colColorStart.g, info.colColorStart.g+(info.colColorEnd.g-info.colColorStart.g)*info.fColorVar); + par->colColor.b = hge->Random_Float(info.colColorStart.b, info.colColorStart.b+(info.colColorEnd.b-info.colColorStart.b)*info.fColorVar); + par->colColor.a = hge->Random_Float(info.colColorStart.a, info.colColorStart.a+(info.colColorEnd.a-info.colColorStart.a)*info.fAlphaVar); + + par->colColorDelta.r = (info.colColorEnd.r-par->colColor.r) / par->fTerminalAge; + par->colColorDelta.g = (info.colColorEnd.g-par->colColor.g) / par->fTerminalAge; + par->colColorDelta.b = (info.colColorEnd.b-par->colColor.b) / par->fTerminalAge; + par->colColorDelta.a = (info.colColorEnd.a-par->colColor.a) / par->fTerminalAge; + + if(bUpdateBoundingBox) rectBoundingBox.Encapsulate(par->vecLocation.x, par->vecLocation.y); + + nParticlesAlive++; + par++; + } + } + + vecPrevLocation=vecLocation; +} + +void hgeParticleSystem::MoveTo(float x, float y, bool bMoveParticles) +{ + int i; + float dx,dy; + + if(bMoveParticles) + { + dx=x-vecLocation.x; + dy=y-vecLocation.y; + + for(i=0;i<nParticlesAlive;i++) + { + particles[i].vecLocation.x += dx; + particles[i].vecLocation.y += dy; + } + + vecPrevLocation.x=vecPrevLocation.x + dx; + vecPrevLocation.y=vecPrevLocation.y + dy; + } + else + { + if(fAge==-2.0) { vecPrevLocation.x=x; vecPrevLocation.y=y; } + else { vecPrevLocation.x=vecLocation.x; vecPrevLocation.y=vecLocation.y; } + } + + vecLocation.x=x; + vecLocation.y=y; +} + +void hgeParticleSystem::FireAt(float x, float y) +{ + Stop(); + MoveTo(x,y); + Fire(); +} + +void hgeParticleSystem::Fire() +{ + if(info.fLifetime==-1.0f) fAge=-1.0f; + else fAge=0.0f; + fResidue=0.0; +} + +void hgeParticleSystem::Stop(bool bKillParticles) +{ + fAge=-2.0f; + if(bKillParticles) + { + nParticlesAlive=0; + rectBoundingBox.Clear(); + } +} + +void hgeParticleSystem::Render() +{ + int i; + DWORD col; + hgeParticle *par=particles; + + col=info.sprite->GetColor(); + + for(i=0; i<nParticlesAlive; i++) + { + info.sprite->SetColor(par->colColor.GetHWColor()); + info.sprite->RenderEx(par->vecLocation.x+fTx, par->vecLocation.y+fTy, par->fSpin*par->fAge, par->fSize); + par++; + } + + info.sprite->SetColor(col); +} + |