Bullet(Cocos2dx)之优化PhysicsDraw3D

分类： cocos2d-x 物理引擎 2015-01-06 20:01 168人阅读评论(0) 收藏举报

cocos2dx bullet 物理引擎

为了测试bullet物体的大小，匆匆写完的PhysicsDraw3D的效率低的要命，这也是为什么cocos2dx弃用了DrawPrimitives,而去使用DrawNode

DrawPrimitives每次绘制都去调用glDrawElements,假如每帧绘制10000条线段，那么就要调用10000次glDrawElements，可见效率之低。

而DrawNode采取的是批处理的方式，当drawLine的时候不是立即绘制，而是将线段的信息添加到数组里，当draw时统一调用gl的绘制函数

10000/1可不是一个小数目啊。

下图使用DrawPrimitives方法

加入40个Sphere帧率就掉到40，70的帧率更是惨不忍睹

下图使用DrawNode方法

为了解决这个问题就要参照DrawNode实现一个简单的DrawNode3D

不管三七二十一，将DrawNode的头文件代码copy，删去一些不需要的，

1.修改V2F_C4B_T2F为V3F_C4B_T2F

2.修改Vec2为Vec3，要绘制3D

3.保留drawPoint,drawPoints,drawLine，其他的绘制函数不要

[cpp] view plain copy

#ifndef__DRAW_NODE_3D_H__
#define__DRAW_NODE_3D_H__
#include"cocos2d.h"
USING_NS_CC;
@H_403_146@classDrawNode3D:@H_403_146@publicNode
{
@H_403_146@public:
@H_403_146@staticDrawNode3D*create();
@H_403_146@voiddrawPoint(@H_403_146@constVec3&point,@H_403_146@constfloatpointSize,@H_403_146@constColor4F&color);
@H_403_146@voiddrawPoints(@H_403_146@constVec3*position,unsignedintnumberOfPoints,@H_403_146@constColor4F&color);
@H_403_146@voiddrawLine(@H_403_146@constVec3&origin,@H_403_146@constVec3&destination,@H_403_146@constColor4F&color);
//Overrides
@H_403_146@virtual@H_403_146@voiddraw(Renderer*renderer,@H_403_146@constMat4&transform,uint32_tflags)override;
@H_403_146@voidclear();
@H_403_146@constBlendFunc&getBlendFunc()@H_403_146@const;
@H_403_146@voidsetBlendFunc(@H_403_146@constBlendFunc&blendFunc);
@H_403_146@voidonDraw(@H_403_146@constMat4&transform,uint32_tflags);
@H_403_146@voidonDrawGLLine(@H_403_146@constMat4&transform,uint32_tflags);
@H_403_146@voidonDrawGLPoint(@H_403_146@constMat4&transform,uint32_tflags);
CC_CONSTRUCTOR_ACCESS:
DrawNode3D();
@H_403_146@virtual~DrawNode3D();
@H_403_146@virtualboolinit();
@H_403_146@protected:
@H_403_146@voidensureCapacity(intcount);
@H_403_146@voidensureCapacityGLPoint(intcount);
@H_403_146@voidensureCapacityGLLine(intcount);
GLuint_vao;
GLuint_vbo;
GLuint_vaoGLPoint;
GLuint_vboGLPoint;
GLuint_vaoGLLine;
GLuint_vboGLLine;
int_bufferCapacity;
GLsizei_bufferCount;
V3F_C4B_T2F*_buffer;
int_bufferCapacityGLPoint;
GLsizei_bufferCountGLPoint;
V3F_C4B_T2F*_bufferGLPoint;
Color4F_pointColor;
int_pointSize;
int_bufferCapacityGLLine;
GLsizei_bufferCountGLLine;
V3F_C4B_T2F*_bufferGLLine;
BlendFunc_blendFunc;
CustomCommand_customCommand;
CustomCommand_customCommandGLPoint;
CustomCommand_customCommandGLLine;
bool_dirty;
bool_dirtyGLPoint;
bool_dirtyGLLine;
@H_403_146@private:
CC_DISALLOW_COPY_AND_ASSIGN(DrawNode3D);
};
#endif

对于DrawNode.cpp按照上面所说同样修改

要记住

[cpp] view plain copy

glVertexAttribPointer(GLProgram::VERTEX_ATTRIB_POSITION,3,GL_FLOAT,GL_FALSE,@H_403_146@sizeof(V3F_C4B_T2F),(GLvoid*)offsetof(V3F_C4B_T2F,vertices));
要将GLProgram::VERTEX_ATTRIB_POSITION,2改为GLProgram::VERTEX_ATTRIB_POSITION,3

因为顶点有三个元素，.cpp代码过多，请在文章最后下载源码，要注意的是绘制时开启深度测试

修改PhysicsDraw3D

删除成员变量,添加DrawNode3D*_drawNode,由于DrawNode3D继承自Node所以创建时要将其添加到父节点上，

修改create，init为如下

staticPhysicsDraw3D*createWithLayer(Node*layer);

boolinitWithLayer(Node*layer);

同时添加

voidclearDraw();

我们知道DrawNode如果不执行clear，那么就不会清空上一帧的绘制数据

具体修改如下：

[cpp] view plain copy

PhysicsDraw3D*PhysicsDraw3D::createWithLayer(Node*layer)
{
autodraw=@H_403_146@newPhysicsDraw3D;
@H_403_146@if(draw&&draw->initWithLayer(layer))
{
@H_403_146@returndraw;
}
@H_403_146@returnnullptr;
}
boolPhysicsDraw3D::initWithLayer(Node*layer)
{
_drawNode=DrawNode3D::create();
layer->addChild(_drawNode);
_debugDrawMode=btIDebugDraw::DBG_MAX_DEBUG_DRAW_MODE;
@H_403_146@return@H_403_146@true;
}
@H_403_146@voidPhysicsDraw3D::clearDraw()
{
_drawNode->clear();
}

销毁时也要将_drawNode从Parent中移除

[cpp] view plain copy

@H_403_146@voidPhysicsDraw3D::destroy()
{
_drawNode->removeFromParent();
@H_403_146@delete@H_403_146@this;
}
drawLine也就简化了
@H_403_146@voidPhysicsDraw3D::drawLine(@H_403_146@constbtVector3&from,@H_403_146@constbtVector3&to,@H_403_146@constbtVector3&color)
{
Vec3vertices[2]={
Vec3(from.x(),from.y(),from.z()),
Vec3(to.x(),to.y(),to.z())
};
_color.r=color.x();
_color.g=color.y();
_color.b=color.z();
_color.a=1.f;
_drawNode->drawLine(vertices[0],vertices[1],_color);
}

PhysicsWorld3D创建的静态函数添加

[cpp] view plain copy

@H_403_146@staticPhysicsWorld3D*createWithDebug(Node*layer,@H_403_146@constbtVector3&gravity=btVector3(0,-10,0));

为的就是创建调试绘制

[cpp] view plain copy

boolPhysicsWorld3D::initWorldWithDebug(Node*layer,@H_403_146@constbtVector3&gravity)
{
@H_403_146@if(!@H_403_146@this->initWorld(gravity))
{
@H_403_146@return@H_403_146@false;
}
_debugDraw=PhysicsDraw3D::createWithLayer(layer);
_world->setDebugDrawer(_debugDraw);
@H_403_146@return@H_403_146@true;
}

同时删除initWorld对_debugDraw的创建，每次绘制时需要判断是否为debug

[cpp] view plain copy

@H_403_146@voidPhysicsWorld3D::debugDraw()
{
@H_403_146@if(_debugDraw)
{
_debugDraw->clearDraw();
_world->debugDrawWorld();
}
}

完整源码

csdn

github

Bullet(Cocos2dx)之优化PhysicsDraw3D

Bullet(Cocos2dx)之优化PhysicsDraw3D

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