absence_thelab: 1cffe3409164 src/3deng/particles.cpp

absence_thelab

view src/3deng/particles.cpp @ 0:1cffe3409164

initial commit

author	John Tsiombikas <nuclear@member.fsf.org>
date	Thu, 23 Oct 2014 01:46:07 +0300
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line source

1 #include "particles.h"

2 #include "3deng.h"

3 #include <cassert>

5 //////////////////////////////////////////////////////

6 // --==( Particle class implementation )==-- //

7 //////////////////////////////////////////////////////

8 using namespace std;

10 Particle::Particle(int life) {

11 pos = Vector3(0, 0, 0);

12 vel = Vector3(0, 0, 0);

13 this->life = life;

14 }

16 Particle::Particle(const Vector3 &pos, int life) {

17 this->pos = pos;

18 vel = Vector3(0, 0, 0);

19 this->life = life;

20 }

22 Particle::Particle(const Vector3 &pos, const Vector3 &vel, int life) {

23 this->pos = pos;

24 this->vel = vel;

25 this->life = life;

26 }

28 void Particle::Update(const Vector3 &forces, float friction) {

29 if(!life) return;

30 vel *= 1.0f - friction;

31 pos += vel + forces;

32 life--;

33 }

35 ///////////////////////////////////////////////////////

36 // --==( Particle System implementation )==-- //

37 ///////////////////////////////////////////////////////

39 ParticleSystem::ParticleSystem(GraphicsContext *gc) {

40 this->gc = gc;

41 pos = prevpos = Vector3(0, 0, 0);

42 size = 1.0f;

43 friction = 0.0f;

44 SpawnRate = 5;

45 life = 100;

46 EmmiterAffectsParticleTrajectory = false;

47 varray = 0;

48 tarray = 0;

49 texture = 0;

50 obj = 0;

52 SetShootDirection(Vector3(0, 0, 0));

53 SetMaxDispersionAngle(0.01f);

54 SetInitialColor(1, 1, 1);

55 SetDeathColor(0, 0, 0);

57 // initialize the shape of the particles

58 pquad[0] = Vertex(Vector3(-0.5f, 0.5f, 0), 0, 0, 0xffffffff);

59 pquad[1] = Vertex(Vector3(0.5f, 0.5f, 1), 1, 0, 0xffffffff);

60 pquad[2] = Vertex(Vector3(0.5f, -0.5f, 1), 1, 1, 0xffffffff);

61 pquad[3] = Vertex(Vector3(-0.5f, -0.5f, 0), 0, 1, 0xffffffff);

63 ptris[0] = Triangle(0, 1, 2);

64 ptris[1] = Triangle(0, 2, 3);

66 for(int i=0; i<4; i++) {

67 pquad[i].normal = Vector3(0, 0, -1);

68 }

70 SetBlendingMode(BLEND_ONE, BLEND_ONE);

71 SpawnDiffDispersion = 0.0f;

73 FixedUpdateRate = true;

74 UpdateRate = 30.0f;

75 LastUpdate = -(1.0f / UpdateRate);

77 SpawnRateChange = 0;

78 }

80 ParticleSystem::~ParticleSystem() {

81 }

83 void ParticleSystem::SetGraphicsContext(GraphicsContext *gc) {

84 this->gc = gc;

85 }

87 void ParticleSystem::SetParticleSize(float psize) {

88 size = psize;

89 }

91 void ParticleSystem::SetParticleLife(int life) {

92 this->life = life;

93 }

95 void ParticleSystem::SetFriction(float friction) {

96 this->friction = friction;

97 }

99 void ParticleSystem::SetSpawnRate(float spawnrate) {

100 SpawnRate = (int)spawnrate;

101 }

102

103 void ParticleSystem::SetSpawnRadius(float radius) {

104 SpawnRadius = radius;

105 }

106

107 void ParticleSystem::SetTexture(Texture *texture) {

108 this->texture = texture;

109 }

110

111 void ParticleSystem::SetObject(Object *obj) {

112 this->obj = obj;

113 }

114

115 void ParticleSystem::SetPosition(const Vector3 &pos) {

116 this->pos = pos;

117 }

118

119 void ParticleSystem::SetShootDirection(const Vector3 &dir) {

120 ShootDirection = dir;

121 }

122

123 void ParticleSystem::SetGravitualForce(float grav) {

124 GravForce = grav;

125 }

126

127 void ParticleSystem::SetEmmiterDependence(bool dep) {

128 EmmiterAffectsParticleTrajectory = dep;

129 }

130

131 void ParticleSystem::SetMaxDispersionAngle(float maxdisp) {

132 DispRads = maxdisp;

133 }

134

135 void ParticleSystem::SetInitialColor(float r, float g, float b) {

136 StartRed = r;

137 StartGreen = g;

138 StartBlue = b;

139 }

140

141 void ParticleSystem::SetDeathColor(float r, float g, float b) {

142 EndRed = r;

143 EndGreen = g;

144 EndBlue = b;

145 }

146

147 void ParticleSystem::SetBlendingMode(BlendingFactor src, BlendingFactor dest) {

148 SourceBlend = src;

149 DestBlend = dest;

150 }

151

152 void ParticleSystem::SetSpawningDifferenceDispersion(float val) {

153 SpawnDiffDispersion = val;

154 }

155

156 void ParticleSystem::SetSpawnRateChange(int change) {

157 SpawnRateChange = change;

158 }

159

160 // transformation stuff

161 void ParticleSystem::Translate(float x, float y, float z) {

162 Translation.Translate(x, y, z);

163 }

164

165 void ParticleSystem::Rotate(float x, float y, float z) {

166 OrbitRot.Rotate(x, y, z);

167 }

168

169 void ParticleSystem::Rotate(const Vector3 &axis, float angle) {

170 OrbitRot.Rotate(axis, angle);

171 }

172

173 void ParticleSystem::ResetRotation() {

174 OrbitRot.ResetIdentity();

175 }

176

177 void ParticleSystem::ResetTranslation() {

178 Translation.ResetIdentity();

179 }

180

181 int ParticleSystem::CountParticles() {

182 ParticleCount = (int)particles.size();

183 TriCount = ParticleCount << 1;

184 VertexCount = ParticleCount << 2;

185 IndexCount = TriCount * 3;

186

187 return ParticleCount;

188 }

189

190 void ParticleSystem::Update(float t) {

191

192 if(FixedUpdateRate && t-LastUpdate < 1.0f/UpdateRate) return;

193 LastUpdate = t;

194

195 // remove all particles that are dead

196 list<Particle>::iterator iter = particles.begin();

197 while(iter != particles.end()) {

198 if(!iter->life) {

199 iter = particles.erase(iter);

200 // if we erase the iterator points to the next so no need to advance explicitly

201 } else {

202 iter++;

203 }

204 }

205

206

207 // spawn the new particles according to spawn rate

208 int LeftToSpawn = SpawnRate;

209 Vector3 ShootDir = ShootDirection;

210 Matrix4x4 dispxform;

211

212 Vector3 forces = Vector3(0.0f, -GravForce, 0.0f);

213

214 // find the velocity of the system by differenciating between the

215 // last and the current position (time interval is considered constant)

216 Vector3 velocity = (pos - prevpos) * 0.1f;

217

218 // adjust the shoot vector to take under consideration the velocity of the system

219 if(EmmiterAffectsParticleTrajectory) ShootDir += velocity;

220

221

222 while(LeftToSpawn--) {

223 Vector3 dir = ShootDir;

224 dispxform.Rotate(frand(DispRads) - DispRads/2.0f, frand(DispRads) - DispRads/2.0f, frand(DispRads) - DispRads/2.0f);

225 dir.Transform(dispxform);

226

227 Vector3 SpawnOffset(frand(SpawnRadius) - SpawnRadius / 2.0f, frand(SpawnRadius) - SpawnRadius / 2.0f, frand(SpawnRadius) - SpawnRadius / 2.0f);

228 Vector3 SpawnDisp(0.0f, 0.0f, 0.0f);

229 if(SpawnDiffDispersion > 0.0f) {

230 SpawnDisp = Vector3(frand(1.0f) - 0.5f, frand(1.0f) - 0.5f, frand(1.0f) - 0.5f);

231 SpawnDisp.Normalize();

232 SpawnDisp *= SpawnDiffDispersion;

233 }

234 particles.insert(particles.end(), Particle(pos + SpawnOffset, dir + SpawnDisp, life));

235 }

236

237

238 //if(EmmiterAffectsParticleTrajectory) forces += velocity;

239

240 iter = particles.begin();

241 while(iter != particles.end()) {

242 iter->Update(forces, friction);

243 iter++;

244 }

245

246 SpawnRate += SpawnRateChange;

247 if(SpawnRate < 0) SpawnRate = 0;

248 }

249

250 inline dword FtoDW(float f) { return *((dword*)&f); }

251

252 void ParticleSystem::Render() {

253

254 CountParticles();

255 if(!ParticleCount) return;

256

257 list<Particle>::iterator iter = particles.begin();

258

259 if(!obj) {

260

261 // ----- Render Billboarded Textured Quads -----

262

263 VertexBuffer *vb;

264 gc->CreateVertexBuffer(ParticleCount, UsageStatic, &vb);

265 Vertex *vbptr;

266 Lock(vb, &vbptr);

267

268 for(int i=0; i<ParticleCount; i++) {

269 vbptr[i].pos = iter->pos;

270

271 float t = 1.0f - (float)iter->life / (float)life;

272 float red = StartRed + (EndRed - StartRed) * t;

273 float green = StartGreen + (EndGreen - StartGreen) * t;

274 float blue = StartBlue + (EndBlue - StartBlue) * t;

275

276 vbptr[i].color = Color(red, green, blue).GetPacked32();

277

278 iter++;

279 }

280 Unlock(vb);

281

282 gc->SetWorldMatrix(Matrix4x4());

283 gc->SetLighting(false);

284 gc->SetZWrite(false);

285 gc->SetTexture(0, texture);

286 gc->SetTextureStageColor(0, TexBlendModulate, TexArgCurrent, TexArgTexture);

287 gc->SetAlphaBlending(true);

288 gc->SetBlendFunc(SourceBlend, DestBlend);

289 gc->SetVertexProgram(FixedFunction);

290

291 gc->SetColorVertex(true);

292

293 gc->D3DDevice->SetRenderState(D3DRS_POINTSPRITEENABLE, true);

294 gc->D3DDevice->SetRenderState(D3DRS_POINTSCALEENABLE, true);

295 gc->D3DDevice->SetRenderState(D3DRS_POINTSIZE, FtoDW(size));

296 gc->D3DDevice->SetRenderState(D3DRS_POINTSCALE_A, FtoDW(0.0f));

297 gc->D3DDevice->SetRenderState(D3DRS_POINTSCALE_B, FtoDW(0.0f));

298 gc->D3DDevice->SetRenderState(D3DRS_POINTSCALE_C, FtoDW(1.0f));

299

300 gc->D3DDevice->SetStreamSource(0, vb, sizeof(Vertex));

301 gc->D3DDevice->DrawPrimitive(D3DPT_POINTLIST, 0, ParticleCount);

302

303 gc->D3DDevice->SetRenderState(D3DRS_POINTSPRITEENABLE, false);

304 gc->D3DDevice->SetRenderState(D3DRS_POINTSCALEENABLE, false);

305

306 gc->SetColorVertex(false);

307

308 gc->SetLighting(true);

309 gc->SetZWrite(true);

310 gc->SetAlphaBlending(false);

311

312 vb->Release();

313 } else {

314

315 // ---- Render Mesh Objects ----

316 for(int i=0; i<ParticleCount; i++) {

317 obj->ResetTranslation();

318 obj->Translate(iter->pos.x, iter->pos.y, iter->pos.z);

319 obj->Render();

320 iter++;

321 }

322 }

323

324

325 }