[Cocos2d-x相关教程来源于红孩儿的游戏编程之路CSDN博客地址：http://blog.csdn.net/honghaier]

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Cocos2d-x2.0 粒子系统深入分析三部曲(二)

//重载粒子系统基类的初始化函数，创建相应数量的粒子。@H_502_141@
1. boolCCParticleSystemQuad::initWithTotalParticles(unsignedintnumberOfParticles)@H_502_141@
2. {@H_502_141@
3. //调用基类的相应函数。@H_502_141@
4. if(CCParticleSystem::initWithTotalParticles(numberOfParticles))@H_502_141@
5. //创建顶点和索引缓冲，如果失败释放并返回。@H_502_141@
6. if(!this->allocMemory()){@H_502_141@
7. this->release();@H_502_141@
8. returnfalse;@H_502_141@
9. }@H_502_141@
10. //填充索引缓冲。@H_502_141@
11. setupIndices();@H_502_141@
12. //如果当前OPENGL版本支持VAO，就创建VAO，如果不支持，只创建VBO。@H_502_141@
13. setupVBOandVAO();@H_502_141@
14. #else@H_502_141@
15. setupVBO();@H_502_141@
16. //设置使用顶点格式为“位置+纹理+顶点色”的顶点格式组合。@H_502_141@
17. setShaderProgram(CCShaderCache::sharedShaderCache()->programForKey(kCCShader_PositionTextureColor));@H_502_141@
18. //告诉通知中心，注册函数listenBackToForeground用来响应当前结点的EVNET_COME_TO_FOREGROUND事件。这个事件的意义是程序将由后面返回到前台。这个事件响应时可做资源的重新载入。@H_502_141@
19. CCNotificationCenter::sharedNotificationCenter()->addObserver(this,@H_502_141@
20. callfuncO_selector(CCParticleSystemQuad::listenBackToForeground),@H_502_141@
21. EVNET_COME_TO_FOREGROUND,@H_502_141@
22. NULL);@H_502_141@
23. true;@H_502_141@
24. //构造函数。@H_502_141@
25. CCParticleSystemQuad::CCParticleSystemQuad()@H_502_141@
26. :m_pQuads(NULL)@H_502_141@
27. ,m_pIndices(NULL)@H_502_141@
28. 502_141@
29. memset(m_pBuffersVBO,sizeof(m_pBuffersVBO));@H_502_141@
30. //析构函数。@H_502_141@
31. CCParticleSystemQuad::~CCParticleSystemQuad()@H_502_141@
32. //对所创建的顶点缓冲，索引缓冲，以及VBO,VA0进行释放。@H_502_141@
33. if(NULL==m_pBatchNode)@H_502_141@
34. CC_SAFE_FREE(m_pQuads);@H_502_141@
35. CC_SAFE_FREE(m_pIndices);@H_502_141@
36. glDeleteBuffers(2,&m_pBuffersVBO[0]);@H_502_141@
37. glDeleteVertexArrays(1,&m_uVAOname);@H_502_141@
38. }@H_502_141@
39. //注销对通知管理器注册的相应事件的响应处理函数。@H_502_141@
40. CCNotificationCenter::sharedNotificationCenter()->removeObserver(502_141@
41. //静态创建函数。由PLIST文件创建相应的当前实例对象，内部调用create实现。@H_502_141@
42. CCParticleSystemQuad*CCParticleSystemQuad::particleWithFile(char*plistFile)@H_502_141@
43. returnCCParticleSystemQuad::create(plistFile);@H_502_141@
44. CCParticleSystemQuad*CCParticleSystemQuad::create(char*plistFile)@H_502_141@
45. //创建一个CCParticleSystemQuad实例对象，进行初始化后交由内存管理器进行引用计数器的管理。@H_502_141@
46. CCParticleSystemQuad*pRet=newCCParticleSystemQuad();@H_502_141@
47. if(pRet&&pRet->initWithFile(plistFile))@H_502_141@
48. pRet->autorelease();@H_502_141@
49. returnpRet;@H_502_141@
50. //如果失败，删除并置空，返回NULL。@H_502_141@
51. CC_SAFE_DELETE(pRet);@H_502_141@
52. //初始化纹理坐标。@H_502_141@
53. voidCCParticleSystemQuad::initTexCoordsWithRect(constCCRect&pointRect)@H_502_141@
54. //创建出相应的矩形。@H_502_141@
55. CCRectrect=CCRectMake(@H_502_141@
56. pointRect.origin.x*CC_CONTENT_SCALE_FACTOR(),248)"> pointRect.origin.y*CC_CONTENT_SCALE_FACTOR(),108); list-style:decimal-leading-zero outside; color:inherit; line-height:18.9473686218262px; margin:0px!important; padding:0px 3px 0px 10px!important"> pointRect.size.width*CC_CONTENT_SCALE_FACTOR(),248)"> pointRect.size.height*CC_CONTENT_SCALE_FACTOR());@H_502_141@
57. //默认使用的是批次结点，以批次结点的纹理对设置所用的图像区域矩形宽高。@H_502_141@
58. GLfloatwide=(GLfloat)pointRect.size.width;@H_502_141@
59. GLfloathigh=(GLfloat)pointRect.size.height;@H_502_141@
60. //如果使用单纹理对象，取得纹理的宽高。@H_502_141@
61. if(m_pTexture)@H_502_141@
62. wide=(GLfloat)m_pTexture->getPixelsWide();@H_502_141@
63. high=(GLfloat)m_pTexture->getPixelsHigh();@H_502_141@
64. //此宏是为了解决精灵边缘黑线而做的纹理坐标的微调。@H_502_141@
65. #ifCC_FIX_ARTIFACTS_BY_STRECHING_TEXEL@H_502_141@
66. GLfloatleft=(rect.origin.x*2+1)/(wide*2);@H_502_141@
67. GLfloatbottom=(rect.origin.y*2+1)/(high*2);@H_502_141@
68. GLfloatright=left+(rect.size.width*2-2)/(wide*2);@H_502_141@
69. GLfloattop=bottom+(rect.size.height*2-2)/(high*2);@H_502_141@
70. GLfloatleft=rect.origin.x/wide;@H_502_141@
71. GLfloatbottom=rect.origin.y/high;@H_502_141@
72. GLfloatright=left+rect.size.width/wide;@H_502_141@
73. GLfloattop=bottom+rect.size.height/high;@H_502_141@
74. //将top与bottom交换一下，因为在Cococs2d-x中坐标系Y轴是向上为正，这里处理一下后面可以做为顶点位置数据。@H_502_141@
75. CC_SWAP(top,bottom,float);@H_502_141@
76. //根据是否使用批次结点来取得相应的矩形顶点缓冲数组。@H_502_141@
77. ccV3F_C4B_T2F_Quad*quads=NULL;@H_502_141@
78. unsignedintstart=0,end=0;@H_502_141@
79. if(m_pBatchNode)@H_502_141@
80. {//如果使用批次结点，这里取得批次结点中所有粒子所对应的矩形顶点数组。@H_502_141@
81. quads=m_pBatchNode->getTextureAtlas()->getQuads();@H_502_141@
82. //取得起始和结束的粒子所对应的矩形索引。@H_502_141@
83. start=m_uAtlasIndex;@H_502_141@
84. end=m_uAtlasIndex+m_uTotalParticles;@H_502_141@
85. else@H_502_141@
86. {//如果使用单纹理对象，则起始矩形索引就是0，结束矩形索引就是最大粒子数量。@H_502_141@
87. quads=m_pQuads;@H_502_141@
88. start=0;@H_502_141@
89. end=m_uTotalParticles;@H_502_141@
90. //遍历所有的矩形顶点。@H_502_141@
91. for(unsignedinti=start;i<end;i++)@H_502_141@
92. //设置四个顶点的纹理坐标。@H_502_141@
93. quads[i].bl.texCoords.u=left;@H_502_141@
94. quads[i].bl.texCoords.v=bottom;@H_502_141@
95. quads[i].br.texCoords.u=right;@H_502_141@
96. quads[i].br.texCoords.v=bottom;@H_502_141@
97. quads[i].tl.texCoords.u=left;@H_502_141@
98. quads[i].tl.texCoords.v=top;@H_502_141@
99. quads[i].tr.texCoords.u=right;@H_502_141@
100. quads[i].tr.texCoords.v=top;@H_502_141@
101. voidCCParticleSystemQuad::setTextureWithRect(CCTexture2D*texture,153); font-weight:bold; background-color:inherit">constCCRect&rect)@H_502_141@
102. //如果当前尚无纹理对或者使用的纹理与参数指定的纹理不同。则设置使用参数指定的纹理。@H_502_141@
103. if(!m_pTexture||texture->getName()!=m_pTexture->getName())@H_502_141@
104. CCParticleSystem::setTexture(texture);@H_502_141@
105. //设置指定的矩形图像区域做为贴图计算粒子系统的纹理坐标.@H_502_141@
106. this->initTexCoordsWithRect(rect);@H_502_141@
107. //设置使用的纹理对象。@H_502_141@
108. voidCCParticleSystemQuad::setTexture(CCTexture2D*texture)@H_502_141@
109. //取得纹理的大小。@H_502_141@
110. constCCSize&s=texture->getContentSize();@H_502_141@
111. this->setTextureWithRect(texture,CCRectMake(0,s.width,s.height));@H_502_141@
112. //设置使用精灵帧中的纹理。@H_502_141@
113. voidCCParticleSystemQuad::setDisplayFrame(CCSpriteFrame*spriteFrame)@H_502_141@
114. //有效性判断。@H_502_141@
115. CCAssert(spriteFrame->getOffsetInPixels().equals(CCPointZero),108); list-style:decimal-leading-zero outside; color:inherit; line-height:18.9473686218262px; margin:0px!important; padding:0px 3px 0px 10px!important"> "QuadParticleonlysupportsSpriteFrameswithnooffsets");@H_502_141@
116. //如果当前尚无纹理对或者使用的纹理与参数指定的纹理不同。则设置使用参数指定的纹理。@H_502_141@
117. if(!m_pTexture||spriteFrame->getTexture()->getName()!=m_pTexture->getName())@H_502_141@
118. //设置使用精灵帧中的纹理.@H_502_141@
119. this->setTexture(spriteFrame->getTexture());@H_502_141@
120. voidCCParticleSystemQuad::setupIndices()@H_502_141@
121. //遍历粒子数目计算索引缓冲值。@H_502_141@
122. inti=0;i<m_uTotalParticles;++i)@H_502_141@
123. constunsignedinti6=i*6;@H_502_141@
124. inti4=i*4;@H_502_141@
125. m_pIndices[i6+0]=(GLushort)i4+0;@H_502_141@
126. m_pIndices[i6+1]=(GLushort)i4+1;@H_502_141@
127. m_pIndices[i6+2]=(GLushort)i4+2;@H_502_141@
128. m_pIndices[i6+5]=(GLushort)i4+1;@H_502_141@
129. m_pIndices[i6+4]=(GLushort)i4+2;@H_502_141@
130. m_pIndices[i6+3]=(GLushort)i4+3;@H_502_141@
131. //更新指定粒子的顶点缓冲中的位置数据。@H_502_141@
132. voidCCParticleSystemQuad::updateQuadWithParticle(tCCParticle*particle,153); font-weight:bold; background-color:inherit">constCCPoint&newPosition)@H_502_141@
133. //定义临时指针变量用于取得相应的粒子所对应的矩形顶点缓冲。@H_502_141@
134. ccV3F_C4B_T2F_Quad*quad;@H_502_141@
135. //如果使用了批次结点。@H_502_141@
136. if(m_pBatchNode)@H_502_141@
137. //取得批次结点中对应的矩形顶点缓冲数组指针。@H_502_141@
138. ccV3F_C4B_T2F_Quad*batchQuads=m_pBatchNode->getTextureAtlas()->getQuads();@H_502_141@
139. //通过索引取得相应的矩形顶点缓冲。@H_502_141@
140. quad=&(batchQuads[m_uAtlasIndex+particle->atlasIndex]);@H_502_141@
141. else@H_502_141@
142. //如果没有使用批次结点，直接取得相应的粒子的矩形顶点缓冲。@H_502_141@
143. quad=&(m_pQuads[m_uParticleIdx]);@H_502_141@
144. //根据是否由ALPHA值来设定RGB取得相应的颜色值。@H_502_141@
145. ccColor4Bcolor=(m_bOpacityModifyRGB)@H_502_141@
146. ?ccc4(particle->color.r*particle->color.a*255,particle->color.g*particle->color.a*255,particle->color.b*particle->color.a*255,particle->color.a*255)@H_502_141@
147. :ccc4(particle->color.r*255,particle->color.g*255,particle->color.b*255,particle->color.a*255);@H_502_141@
148. //填真顶点缓冲中的颜色信息。@H_502_141@
149. quad->bl.colors=color;@H_502_141@
150. quad->br.colors=color;@H_502_141@
151. quad->tl.colors=color;@H_502_141@
152. quad->tr.colors=color;@H_502_141@
153. //设置顶点的位置信息@H_502_141@
154. GLfloatsize_2=particle->size/2;@H_502_141@
155. //判断是否进行旋转。@H_502_141@
156. if(particle->rotation)@H_502_141@
157. //定义临时变量来存放以size_2为半径的矩形外圆上的四个顶点。@H_502_141@
158. GLfloatx1=-size_2;@H_502_141@
159. GLfloaty1=-size_2;@H_502_141@
160. GLfloatx2=size_2;@H_502_141@
161. GLfloaty2=size_2;@H_502_141@
162. //定义临时变量来存放圆心。@H_502_141@
163. GLfloatx=newPosition.x;@H_502_141@
164. GLfloaty=newPosition.y;@H_502_141@
165. //求得旋转角度。@H_502_141@
166. GLfloatr=(GLfloat)-CC_DEGREES_TO_RADIANS(particle->rotation);@H_502_141@
167. //通过sin,cos来计算旋转后的矩形外圆上的四个角的顶点位置。@H_502_141@
168. GLfloatcr=cosf(r);@H_502_141@
169. GLfloatsr=sinf(r);@H_502_141@
170. GLfloatax=x1*cr-y1*sr+x;@H_502_141@
171. GLfloatay=x1*sr+y1*cr+y;@H_502_141@
172. GLfloatbx=x2*cr-y1*sr+x;@H_502_141@
173. GLfloatby=x2*sr+y1*cr+y;@H_502_141@
174. GLfloatcx=x2*cr-y2*sr+x;@H_502_141@
175. GLfloatcy=x2*sr+y2*cr+y;@H_502_141@
176. GLfloatdx=x1*cr-y2*sr+x;@H_502_141@
177. GLfloatdy=x1*sr+y2*cr+y;@H_502_141@
178. //填充计算旋转后的顶点位置信息。@H_502_141@
179. quad->bl.vertices.x=ax;@H_502_141@
180. quad->bl.vertices.y=ay;@H_502_141@
181. quad->br.vertices.x=bx;@H_502_141@
182. quad->br.vertices.y=by;@H_502_141@
183. quad->tl.vertices.x=dx;@H_502_141@
184. quad->tl.vertices.y=dy;@H_502_141@
185. quad->tr.vertices.x=cx;@H_502_141@
186. quad->tr.vertices.y=cy;@H_502_141@
187. //如果不旋转，直接填充位置信息。@H_502_141@
188. quad->bl.vertices.x=newPosition.x-size_2;@H_502_141@
189. quad->bl.vertices.y=newPosition.y-size_2;@H_502_141@
190. quad->br.vertices.x=newPosition.x+size_2;@H_502_141@
191. quad->br.vertices.y=newPosition.y-size_2;@H_502_141@
192. quad->tl.vertices.x=newPosition.x-size_2;@H_502_141@
193. quad->tl.vertices.y=newPosition.y+size_2;@H_502_141@
194. quad->tr.vertices.x=newPosition.x+size_2;@H_502_141@
195. quad->tr.vertices.y=newPosition.y+size_2;@H_502_141@
196. //我们一直想知道在CCParticleSystem中每次update时，如果粒子批次结点为空时为什么要调用postStep？它倒底是干什么的，看完下面的代码，就很清楚了。@H_502_141@
197. voidCCParticleSystemQuad::postStep()@H_502_141@
198. //绑定顶点缓冲区对象。@H_502_141@
199. glBindBuffer(GL_ARRAY_BUFFER,m_pBuffersVBO[0]);@H_502_141@
200. //用m_pQuads中数据更新绑定的缓冲区数据。@H_502_141@
201. glBufferSubData(GL_ARRAY_BUFFER,153); font-weight:bold; background-color:inherit">sizeof(m_pQuads[0])*m_uParticleCount,m_pQuads);@H_502_141@
202. //取消绑定缓冲区对象。@H_502_141@
203. 502_141@
204. CHECK_GL_ERROR_DEBUG();@H_502_141@
205. //清楚了，原来这个函数是针对不使用批次结点时的VBO顶点缓冲的更新。@H_502_141@
206. //绘制粒子系统。@H_502_141@
207. voidCCParticleSystemQuad::draw()@H_502_141@
208. //如果当前在粒子的批次结点有值，则draw()不应该被调用！为什么呢？因为有批次结点的话，渲染交给批次结点的draw()函数而不是当前粒子系统的draw()函数来处理。@H_502_141@
209. CCAssert(!m_pBatchNode,"drawshouldnotbecalledwhenaddedtoaparticleBatchNode");@H_502_141@
210. //使用相应的Shader@H_502_141@
211. CC_NODE_DRAW_SETUP();@H_502_141@
212. //绑定所用的纹理对象。@H_502_141@
213. ccGLBindTexture2D(m_pTexture->getName());@H_502_141@
214. //设定所用的ALPHA混合方案。@H_502_141@
215. ccGLBlendFunc(m_tBlendFunc.src,m_tBlendFunc.dst);@H_502_141@
216. //判断当前粒子索引是否为粒子总数，也就是判断是否已经update完成未出错。@H_502_141@
217. CCAssert(m_uParticleIdx==m_uParticleCount,"Abnormalerrorinparticlequad");@H_502_141@
218. //如果使用VAO。@H_502_141@
219. //使用VAO绑定的顶点数组@H_502_141@
220. glBindVertexArray(m_uVAOname);@H_502_141@
221. //绑定索引数组@H_502_141@
222. #ifCC_REBIND_INDICES_BUFFER@H_502_141@
223. glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,m_pBuffersVBO[1]);@H_502_141@
224. //渲染调用@H_502_141@
225. glDrawElements(GL_TRIANGLES,(GLsizei)m_uParticleIdx*6,GL_UNSIGNED_SHORT,0);@H_502_141@
226. //渲染完取消绑定索引数组@H_502_141@
227. //取消绑定顶点数组@H_502_141@
228. glBindVertexArray(0);@H_502_141@
229. //@H_502_141@
230. //UsingVBOwithoutVAO@H_502_141@
231. //@H_502_141@
232. #definekQuadSizesizeof(m_pQuads[0].bl)@H_502_141@
233. //设置使用相应的顶点格式为:位置+颜色+纹理坐标@H_502_141@
234. ccGLEnableVertexAttribs(kCCVertexAttribFlag_PosColorTex);@H_502_141@
235. //绑定顶点缓冲@H_502_141@
236. //设置顶点缓冲中位置数据的描述@H_502_141@
237. glVertexAttribPointer(kCCVertexAttrib_Position,3,GL_FLOAT,GL_FALSE,kQuadSize,(GLvoid*)offsetof(ccV3F_C4B_T2F,vertices));@H_502_141@
238. //设置顶点缓冲中颜色数据的描述@H_502_141@
239. glVertexAttribPointer(kCCVertexAttrib_Color,4,GL_UNSIGNED_BYTE,GL_TRUE,colors));@H_502_141@
240. //设置顶点缓冲中纹理坐标数据的描述@H_502_141@
241. glVertexAttribPointer(kCCVertexAttrib_TexCoords,2,texCoords));@H_502_141@
242. //绑定索引缓冲@H_502_141@
243. //渲染调用@H_502_141@
244. glDrawElements(GL_TRIANGLES,0); background-color:inherit">//取消绑定@H_502_141@
245. glBindBuffer(GL_ELEMENT_ARRAY_BUFFER,0); background-color:inherit">//渲染调用计数器加一@H_502_141@
246. CC_INCREMENT_GL_DRAWS(1);@H_502_141@
247. CHECK_GL_ERROR_DEBUG();@H_502_141@
248. //设置粒子数量@H_502_141@
249. voidCCParticleSystemQuad::setTotalParticles(unsignedinttp)@H_502_141@
250. //如果要申请内存的粒子数量大于之前已经申请内存的粒子数量。@H_502_141@
251. if(tp>m_uAllocatedParticles)@H_502_141@
252. //计算要申请的内存大小。@H_502_141@
253. //粒子信息结构数组大小。@H_502_141@
254. size_tparticlesSize=tp*sizeof(tCCParticle);@H_502_141@
255. //顶点缓冲的大小@H_502_141@
256. size_tquadsSize=sizeof(m_pQuads[0])*tp*1;@H_502_141@
257. //索引缓冲的大小@H_502_141@
258. size_tindicesSize=sizeof(m_pIndices[0])*tp*6*1;@H_502_141@
259. //在m_pParticles指定的内存位置申请相应大小的内存用于存储粒子信息结构数组。@H_502_141@
260. tCCParticle*particlesNew=(tCCParticle*)realloc(m_pParticles,particlesSize);@H_502_141@
261. //在m_pQuads指定的内存位置申请相应大小的内存用于填充顶点缓冲。@H_502_141@
262. ccV3F_C4B_T2F_Quad*quadsNew=(ccV3F_C4B_T2F_Quad*)realloc(m_pQuads,quadsSize);@H_502_141@
263. //在m_pIndices指定的内存位置申请相应大小的内存用于填充索引缓冲。@H_502_141@
264. GLushort*indicesNew=(GLushort*)realloc(m_pIndices,indicesSize);@H_502_141@
265. //如果申请都成功。@H_502_141@
266. if(particlesNew&&quadsNew&&indicesNew)@H_502_141@
267. //将内存地址传值给成员指针。@H_502_141@
268. m_pParticles=particlesNew;@H_502_141@
269. m_pQuads=quadsNew;@H_502_141@
270. m_pIndices=indicesNew;@H_502_141@
271. //内存清零@H_502_141@
272. memset(m_pParticles,108); list-style:decimal-leading-zero outside; color:inherit; line-height:18.9473686218262px; margin:0px!important; padding:0px 3px 0px 10px!important"> memset(m_pQuads,quadsSize);@H_502_141@
273. memset(m_pIndices,0); background-color:inherit">//记录申请内存的粒子数量。@H_502_141@
274. m_uAllocatedParticles=tp;@H_502_141@
275. //如果失败，记录成功申请的内存地址打印出错LOG。@H_502_141@
276. if(particlesNew)m_pParticles=particlesNew;@H_502_141@
277. if(quadsNew)m_pQuads=quadsNew;@H_502_141@
278. if(indicesNew)m_pIndices=indicesNew;@H_502_141@
279. CCLOG("Particlesystem:outofmemory");@H_502_141@
280. return;@H_502_141@
281. //更新粒子数量。@H_502_141@
282. m_uTotalParticles=tp;@H_502_141@
283. //根据是否使用批次结点来设定每个粒子对应的矩形顶点块的索引。@H_502_141@
284. inti=0;i<m_uTotalParticles;i++)@H_502_141@
285. m_pParticles[i].atlasIndex=i;@H_502_141@
286. //填充索引缓冲。@H_502_141@
287. setupIndices();@H_502_141@
288. //初始化VAO@H_502_141@
289. setupVBOandVAO();@H_502_141@
290. //如果要申请内存的粒子数量小于原来申请的粒子数量，直接修改一下最大粒子数量就OK。@H_502_141@
291. m_uTotalParticles=tp;@H_502_141@
292. //如果当前OPENGL版本支持VAO。@H_502_141@
293. //初始化VBO与VAO@H_502_141@
294. voidCCParticleSystemQuad::setupVBOandVAO()@H_502_141@
295. //初始化1个顶点数组对象，产生VAO对象的句柄@H_502_141@
296. glGenVertexArrays(1,0); background-color:inherit">//绑定VAO。@H_502_141@
297. glBindVertexArray(m_uVAOname);@H_502_141@
298. //创建2个VBO缓冲区对象，产生两个句柄填充到句柄数组中。@H_502_141@
299. glGenBuffers(2,0); background-color:inherit">//绑定第一个VBO缓冲区对象。@H_502_141@
300. //将顶点数据拷贝到绑定的缓冲区。@H_502_141@
301. glBufferData(GL_ARRAY_BUFFER,153); font-weight:bold; background-color:inherit">sizeof(m_pQuads[0])*m_uTotalParticles,m_pQuads,GL_DYNAMIC_DRAW);@H_502_141@
302. //设置使用位置数据@H_502_141@
303. glEnableVertexAttribArray(kCCVertexAttrib_Position);@H_502_141@
304. //设置位置数据在顶点缓冲中的描述@H_502_141@
305. glVertexAttribPointer(kCCVertexAttrib_Position,vertices));@H_502_141@
306. //设置使用颜色数据@H_502_141@
307. glEnableVertexAttribArray(kCCVertexAttrib_Color);@H_502_141@
308. //设置颜色数据在顶点缓冲中的描述@H_502_141@
309. //设置使用纹理坐标数据@H_502_141@
310. glEnableVertexAttribArray(kCCVertexAttrib_TexCoords);@H_502_141@
311. //设置纹理坐标数据在顶点缓冲中的描述@H_502_141@
312. glVertexAttribPointer(kCCVertexAttrib_TexCoords,texCoords));@H_502_141@
313. //绑定VBO的第二个缓冲区@H_502_141@
314. //将索引缓冲区数据拷贝到绑定的缓冲区@H_502_141@
315. glBufferData(GL_ELEMENT_ARRAY_BUFFER,153); font-weight:bold; background-color:inherit">sizeof(m_pIndices[0])*m_uTotalParticles*6,m_pIndices,GL_STATIC_DRAW);@H_502_141@
316. glBindVertexArray(0);@H_502_141@
317. //否则只使用VBO@H_502_141@
318. voidCCParticleSystemQuad::setupVBO()@H_502_141@
319. //创建2个VBO缓冲区对象，产生两个句柄填充到句柄数组中。@H_502_141@
320. glGenBuffers(2,&m_pBuffersVBO[0]);@H_502_141@
321. //绑定第一个VBO缓冲区对象并填充数据。@H_502_141@
322. glBindBuffer(GL_ARRAY_BUFFER,m_pBuffersVBO[0]);@H_502_141@
323. //绑定第二个VBO缓冲区对象并填充数据。@H_502_141@
324. 502_141@
325. //响应当前结点的EVNET_COME_TO_FOREGROUND事件。这个事件的意义是程序将由后面返回到前台。这个事件响应时可做资源的重新载入。@H_502_141@
326. voidCCParticleSystemQuad::listenBackToForeground(CCObject*obj)@H_502_141@
327. //重新初始化VBO和VAO。@H_502_141@
328. //创建顶点缓冲和索引缓冲区。@H_502_141@
329. boolCCParticleSystemQuad::allocMemory()@H_502_141@
330. //如果已经申请则中断。@H_502_141@
331. CCAssert((!m_pQuads&&!m_pIndices),"Memoryalreadyalloced");@H_502_141@
332. CCAssert(!m_pBatchNode,"MemoryshouldnotbeallocedwhennotusingbatchNode");@H_502_141@
333. //释放顶点与索引缓冲@H_502_141@
334. //为顶点与索引缓冲申请内存。@H_502_141@
335. m_pQuads=(ccV3F_C4B_T2F_Quad*)malloc(m_uTotalParticles*sizeof(ccV3F_C4B_T2F_Quad));@H_502_141@
336. m_pIndices=(GLushort*)malloc(m_uTotalParticles*6*sizeof(GLushort));@H_502_141@
337. //如果出现失败，则提示LOG并释放置空返回。@H_502_141@
338. if(!m_pQuads||!m_pIndices)@H_502_141@
339. CCLOG("cocos2d:Particlesystem:notenoughmemory");@H_502_141@
340. CC_SAFE_FREE(m_pQuads);@H_502_141@
341. CC_SAFE_FREE(m_pIndices);@H_502_141@
342. //如果成功，置零操作返回true.@H_502_141@
343. //设置CCParticleSystemQuad使用的粒子批次结点。@H_502_141@
344. voidCCParticleSystemQuad::setBatchNode(CCParticleBatchNode*batchNode)@H_502_141@
345. //如果当前使用的粒子批次结点与参数不同，则进行更换处理。@H_502_141@
346. if(m_pBatchNode!=batchNode)@H_502_141@
347. //先记录一下当前使用的。@H_502_141@
348. CCParticleBatchNode*oldBatch=m_pBatchNode;@H_502_141@
349. //将后调用基类相应函数，设置当前使用的粒子批次结点。@H_502_141@
350. CCParticleSystem::setBatchNode(batchNode);@H_502_141@
351. //如果参数值为空，代表不使用批次结点。则进行顶点缓冲的相关初始化。@H_502_141@
352. if(!batchNode)@H_502_141@
353. //创建顶点缓冲，填充索引，并根据是否可用VAO设置顶点缓冲,设置纹理。@H_502_141@
354. allocMemory();@H_502_141@
355. setTexture(oldBatch->getTexture());@H_502_141@
356. setupVBO();@H_502_141@
357. //如果批次结点有效，且更换前没有使用粒子批次结点。@H_502_141@
358. elseif(!oldBatch)@H_502_141@
359. //取得相应粒子批次结点的矩形数组，取出相应索引位置的矩形数据，将相应的顶点缓冲数据拷到矩形数组中。@H_502_141@
360. ccV3F_C4B_T2F_Quad*quad=&(batchQuads[m_uAtlasIndex]);@H_502_141@
361. memcpy(quad,153); font-weight:bold; background-color:inherit">sizeof(m_pQuads[0]));@H_502_141@
362. //释放当前用的顶点缓冲@H_502_141@
363. //释放所用的VBO顶点对象与AVO名称@H_502_141@
364. glDeleteBuffers(2,108); list-style:decimal-leading-zero outside; color:inherit; line-height:18.9473686218262px; margin:0px!important; padding:0px 3px 0px 10px!important"> glDeleteVertexArrays(1,&m_uVAOname);@H_502_141@
365. //创建一个CCParticleSystemQuad,内部调用create实现。@H_502_141@
366. CCParticleSystemQuad*CCParticleSystemQuad::node()@H_502_141@
367. returnCCParticleSystemQuad::create();@H_502_141@
368. CCParticleSystemQuad*CCParticleSystemQuad::create(){@H_502_141@
369. //创建一个CCParticleSystemQuad的实例对象。@H_502_141@
370. CCParticleSystemQuad*pParticleSystemQuad=newCCParticleSystemQuad();@H_502_141@
371. //如果创建成功，进行初始化。成功后交由内存管理器进行引用计数器的管理。@H_502_141@
372. if(pParticleSystemQuad&&pParticleSystemQuad->init())@H_502_141@
373. pParticleSystemQuad->autorelease();@H_502_141@
374. returnpParticleSystemQuad;@H_502_141@
375. //如果失败，释放置空并返回NULL。@H_502_141@
376. CC_SAFE_DELETE(pParticleSystemQuad);@H_502_141@
377. returnNULL;@H_502_141@
378. }@H_502_141@