定制cocos2d的GLView

Cocos2d-x 前端之家
前端之家收集整理的这篇文章主要介绍了定制cocos2d的GLView，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。

使用场景

需求：将cocos2d 的输出窗口设置为一个子窗口，父窗口其它部分仍然有控件

cocos2d功能强大，但是却不好整合进各种gdi和MFC程序中，有些实现是改cocos2d的项目源代码，这样的话，后续升级版本麻烦些，本文提供的方法可以不修改cocos2d源码

实现步骤

1.从cocos2d::GLView派生类WGLView，需要实现 end,swapBuffers,isOpenGLReady,setIMEKeyboardState,windowShouldClose,getWin32Window 这几个虚函数

2.windows 下的 OpenGL初始化流程有这么几项：

(1).外部提供一个HWND，需要窗口类注册时具有 CS_OWNDC标志

(2).获取HWND的HDC，使用SetPixelFormat来调整窗口像素格式，选择的格式需要具有PFD_SUPPORT_OPENGL,PFD_DRAW_TO_WINDOW,PFD_TYPE_RGBA,PFD_DOUBLEBUFFER这几个标志

(3).使用wglCreateContext创建OpenGL环境上下文

//如果准备在其它线程内使用OpenGL，下面转入该线程执行

(4).wglMakeCurrent使用创建好的上下文

(5).初始化glew (必须在 wglMakeCurrent调用后执行，否则glewInit() 会返回错误 1)

(6).Director::setOpenGLView 设置 GLView(必须在glew初始化后执行，否则内部会报空指针错误，因为对应的glew函数指针尚未初始化)

(7).一些后续的初始化

代码（适用于cocos2d 3.13）

Application 
  1. static bool glew_dynamic_binding()
  2. {
  3. 	const char *gl_extensions = (const char*)glGetString(GL_EXTENSIONS);
  4.  
  5. 	// If the current opengl driver doesn't have framebuffers methods,check if an extension exists
  6. 	if (glGenFramebuffers == nullptr)
  7. 	{
  8. 		log("OpenGL: glGenFramebuffers is nullptr,try to detect an extension");
  9. 		if (strstr(gl_extensions,"ARB_framebuffer_object"))
  10. 		{
  11. 			log("OpenGL: ARB_framebuffer_object is supported");
  12.  
  13. 			glIsRenderbuffer = (PFNGLISRENDERBUFFERPROC)wglGetProcAddress("glIsRenderbuffer");
  14. 			glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)wglGetProcAddress("glBindRenderbuffer");
  15. 			glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)wglGetProcAddress("glDeleteRenderbuffers");
  16. 			glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)wglGetProcAddress("glGenRenderbuffers");
  17. 			glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)wglGetProcAddress("glRenderbufferStorage");
  18. 			glGetRenderbufferParameteriv = (PFNGLGETRENDERBUFFERPARAMETERIVPROC)wglGetProcAddress("glGetRenderbufferParameteriv");
  19. 			glIsFramebuffer = (PFNGLISFRAMEBUFFERPROC)wglGetProcAddress("glIsFramebuffer");
  20. 			glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)wglGetProcAddress("glBindFramebuffer");
  21. 			glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)wglGetProcAddress("glDeleteFramebuffers");
  22. 			glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)wglGetProcAddress("glGenFramebuffers");
  23. 			glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)wglGetProcAddress("glCheckFramebufferStatus");
  24. 			glFramebufferTexture1D = (PFNGLFRAMEBUFFERTEXTURE1DPROC)wglGetProcAddress("glFramebufferTexture1D");
  25. 			glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)wglGetProcAddress("glFramebufferTexture2D");
  26. 			glFramebufferTexture3D = (PFNGLFRAMEBUFFERTEXTURE3DPROC)wglGetProcAddress("glFramebufferTexture3D");
  27. 			glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)wglGetProcAddress("glFramebufferRenderbuffer");
  28. 			glGetFramebufferAttachmentParameteriv = (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVPROC)wglGetProcAddress("glGetFramebufferAttachmentParameteriv");
  29. 			glGenerateMipmap = (PFNGLGENERATEMIPMAPPROC)wglGetProcAddress("glGenerateMipmap");
  30. 		}
  31. 		else if (strstr(gl_extensions,"EXT_framebuffer_object"))
  32. 		{
  33. 			log("OpenGL: EXT_framebuffer_object is supported");
  34. 			glIsRenderbuffer = (PFNGLISRENDERBUFFERPROC)wglGetProcAddress("glIsRenderbufferEXT");
  35. 			glBindRenderbuffer = (PFNGLBINDRENDERBUFFERPROC)wglGetProcAddress("glBindRenderbufferEXT");
  36. 			glDeleteRenderbuffers = (PFNGLDELETERENDERBUFFERSPROC)wglGetProcAddress("glDeleteRenderbuffersEXT");
  37. 			glGenRenderbuffers = (PFNGLGENRENDERBUFFERSPROC)wglGetProcAddress("glGenRenderbuffersEXT");
  38. 			glRenderbufferStorage = (PFNGLRENDERBUFFERSTORAGEPROC)wglGetProcAddress("glRenderbufferStorageEXT");
  39. 			glGetRenderbufferParameteriv = (PFNGLGETRENDERBUFFERPARAMETERIVPROC)wglGetProcAddress("glGetRenderbufferParameterivEXT");
  40. 			glIsFramebuffer = (PFNGLISFRAMEBUFFERPROC)wglGetProcAddress("glIsFramebufferEXT");
  41. 			glBindFramebuffer = (PFNGLBINDFRAMEBUFFERPROC)wglGetProcAddress("glBindFramebufferEXT");
  42. 			glDeleteFramebuffers = (PFNGLDELETEFRAMEBUFFERSPROC)wglGetProcAddress("glDeleteFramebuffersEXT");
  43. 			glGenFramebuffers = (PFNGLGENFRAMEBUFFERSPROC)wglGetProcAddress("glGenFramebuffersEXT");
  44. 			glCheckFramebufferStatus = (PFNGLCHECKFRAMEBUFFERSTATUSPROC)wglGetProcAddress("glCheckFramebufferStatusEXT");
  45. 			glFramebufferTexture1D = (PFNGLFRAMEBUFFERTEXTURE1DPROC)wglGetProcAddress("glFramebufferTexture1DEXT");
  46. 			glFramebufferTexture2D = (PFNGLFRAMEBUFFERTEXTURE2DPROC)wglGetProcAddress("glFramebufferTexture2DEXT");
  47. 			glFramebufferTexture3D = (PFNGLFRAMEBUFFERTEXTURE3DPROC)wglGetProcAddress("glFramebufferTexture3DEXT");
  48. 			glFramebufferRenderbuffer = (PFNGLFRAMEBUFFERRENDERBUFFERPROC)wglGetProcAddress("glFramebufferRenderbufferEXT");
  49. 			glGetFramebufferAttachmentParameteriv = (PFNGLGETFRAMEBUFFERATTACHMENTPARAMETERIVPROC)wglGetProcAddress("glGetFramebufferAttachmentParameterivEXT");
  50. 			glGenerateMipmap = (PFNGLGENERATEMIPMAPPROC)wglGetProcAddress("glGenerateMipmapEXT");
  51. 		}
  52. 		else
  53. 		{
  54. 			log("OpenGL: No framebuffers extension is supported");
  55. 			log("OpenGL: Any call to Fbo will crash!");
  56. 			return false;
  57. 		}
  58. 	}
  59. 	return true;
  60. }
  61. static bool initGlew()
  62. {
  63. 	GLenum GlewInitResult = glewInit();
  64. 	if (GLEW_OK != GlewInitResult)
  65. 		return false;	//must be called after calling wglMakeCurrent
  66.  
  67. 	if (glew_dynamic_binding() == false)
  68. 		return false;
  69. 	return true;
  70. }
  71.  
  72. class AppDelegate : public cocos2d::Application
  73. {
  74. 	float sceneWidth_,sceneHeight_,frameRate_;
  75. 	HWND hwnd_;
  76. 	cocos2d::GLView *glview_;
  77.  
  78. public:
  79. 	AppDelegate(float sceneWidth,float sceneHeight,float frameRate,HWND hwndRender)
  80. 	: sceneWidth_(sceneWidth),sceneHeight_(sceneHeight),frameRate_(frameRate),hwnd_(hwndRender),glview_(nullptr)
  81. 	{
  82. 		extern cocos2d::GLView* CreateWGLView(HWND);
  83. 		glview_ = CreateWGLView(hwnd_);
  84. 	}
  85.  
  86. 	virtual bool applicationDidFinishLaunching()
  87. 	{	// execute in engine thread
  88. 		glview_->setFrameSize(sceneWidth_,sceneHeight_);
  89. 		glview_->setDesignResolutionSize(sceneWidth_,ResolutionPolicy::NO_BORDER);
  90.  
  91. 		extern void ActiveWGLView(cocos2d::GLView *);
  92. 		ActiveWGLView(glview_);
  93. 		initGlew();
  94. 		auto director = Director::getInstance();
  95. 		director->setOpenGLView(glview_);
  96. 		director->setContentScaleFactor(1.0);
  97. 		director->setDisplayStats(false);
  98. 		director->setAnimationInterval(1.0 / frameRate_);
  99. 		return true;
  100. 	}
  101. 	virtual void applicationDidEnterBackground()
  102. 	{
  103. 		Director::getInstance()->stopAnimation();
  104. 	}
  105. 	virtual void applicationWillEnterForeground()
  106. 	{
  107. 		Director::getInstance()->startAnimation();
  108. 	}
  109. };
GLView 
  1. static int findPixelFormat(HDC hdc,int colorBits,int depthBits,int stencilBits)
  2. {
  3. 	int currMode;                               // pixel format mode ID
  4. 	int bestMode = 0;                           // return value,best pixel format
  5. 	int currscore = 0;                          // points of current mode
  6. 	int bestscore = 0;                          // points of best candidate
  7. 	PIXELFORMATDESCRIPTOR pfd;
  8.  
  9. 	// search the available formats for the best mode
  10. 	bestMode = 0;
  11. 	bestscore = 0;
  12. 	for (currMode = 1; ::DescribePixelFormat(hdc,currMode,sizeof(pfd),&pfd) > 0; ++currMode)
  13. 	{
  14. 		// ignore if cannot support opengl
  15. 		if (!(pfd.dwFlags & PFD_SUPPORT_OPENGL))
  16. 			continue;
  17.  
  18. 		// ignore if cannot render into a window
  19. 		if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW))
  20. 			continue;
  21.  
  22. 		// ignore if cannot support rgba mode
  23. 		if ((pfd.iPixelType != PFD_TYPE_RGBA) || (pfd.dwFlags & PFD_NEED_PALETTE))
  24. 			continue;
  25.  
  26. 		// ignore if not double buffer
  27. 		if (!(pfd.dwFlags & PFD_DOUBLEBUFFER))
  28. 			continue;
  29.  
  30. 		// try to find best candidate
  31. 		currscore = 0;
  32.  
  33. 		// colour bits
  34. 		if (pfd.cColorBits >= colorBits) ++currscore;
  35. 		if (pfd.cColorBits == colorBits) ++currscore;
  36.  
  37. 		// depth bits
  38. 		if (pfd.cDepthBits >= depthBits) ++currscore;
  39. 		if (pfd.cDepthBits == depthBits) ++currscore;
  40.  
  41. 		// stencil bits
  42. 		if (pfd.cStencilBits >= stencilBits) ++currscore;
  43. 		if (pfd.cStencilBits == stencilBits) ++currscore;
  44.  
  45. 		// alpha bits
  46. 		if (pfd.cAlphaBits > 0) ++currscore;
  47.  
  48. 		// check if it is best mode so far
  49. 		if (currscore > bestscore)
  50. 		{
  51. 			bestscore = currscore;
  52. 			bestMode = currMode;
  53. 		}
  54. 	}
  55. 	return bestMode;
  56. }
  57. static bool setPixelFormat(HDC hdc,int stencilBits)
  58. {
  59. 	PIXELFORMATDESCRIPTOR pfd;
  60.  
  61. 	// find out the best matched pixel format
  62. 	int pixelFormat = findPixelFormat(hdc,colorBits,depthBits,stencilBits);
  63. 	if (pixelFormat == 0)
  64. 		return false;
  65.  
  66. 	// set members of PIXELFORMATDESCRIPTOR with given mode ID
  67. 	::DescribePixelFormat(hdc,pixelFormat,&pfd);
  68.  
  69. 	// set the fixel format
  70. 	if (!::SetPixelFormat(hdc,&pfd))
  71. 		return false;
  72.  
  73. 	return true;
  74. }
  75.  
  76. class WGLView : public cocos2d::GLView
  77. {
  78. 	HWND hwnd_;
  79. 	HDC hdc_;
  80. 	HGLRC hglrc_;
  81. public:
  82. 	WGLView() : hwnd_(0),hdc_(0),hglrc_(0)
  83. 	{}
  84.  
  85. 	virtual void end() override
  86. 	{
  87. 		closeContext();
  88. 	}
  89. 	virtual void swapBuffers() override
  90. 	{
  91. 		::SwapBuffers(hdc_);
  92. 	}
  93. 	virtual bool isOpenGLReady() override { return hwnd_ != 0; }
  94. 	virtual void setIMEKeyboardState(bool open) override {}
  95. 	virtual bool windowShouldClose() override { return true; };
  96. 	virtual HWND getWin32Window() override { return hwnd_; }
  97.  
  98. 	bool createContext(HWND hwnd,int stencilBits)
  99. 	{
  100. 		// retrieve a handle to a display device context
  101. 		hwnd_ = hwnd;
  102. 		hdc_ = ::GetDC(hwnd);
  103.  
  104. 		// set pixel format
  105. 		if (!setPixelFormat(hdc_,stencilBits))
  106. 		{
  107. 			::ReleaseDC(hwnd,hdc_);
  108. 			return false;
  109. 		}
  110.  
  111. 		// create a new OpenGL rendering context
  112. 		hglrc_ = ::wglCreateContext(hdc_);
  113. 		::ReleaseDC(hwnd,hdc_);
  114. 		return true;
  115. 	}
  116. 	void activeContext()
  117. 	{
  118. 		::wglMakeCurrent(hdc_,hglrc_);
  119. 	}
  120. 	void closeContext()
  121. 	{
  122. 		if (!hdc_ || !hglrc_)
  123. 			return;
  124.  
  125. 		// delete DC and RC
  126. 		::wglMakeCurrent(0,0);
  127. 		::wglDeleteContext(hglrc_);
  128. 		::ReleaseDC(hwnd_,hdc_);
  129.  
  130. 		hdc_ = 0;
  131. 		hglrc_ = 0;
  132. 		hwnd_ = 0;
  133. 	}
  134.  
  135. };
  136.  
  137. void ActiveWGLView(cocos2d::GLView *view)
  138. {
  139. 	WGLView *v = dynamic_cast<WGLView *>(view);
  140. 	if (v)
  141. 		v->activeContext();
  142. }
  143. cocos2d::GLView* CreateWGLView(HWND wndExist)
  144. {
  145. 	WGLView *view = new WGLView();
  146. 	if (!view->createContext(wndExist,32,24,8))
  147. 	{
  148. 		delete view;
  149. 		return nullptr;
  150. 	}
  151. 	return view;
  152. }
函数 initGlew 从cocos2d-2.2.6拷贝的，3.13一样可以用

另外，推荐一下一个wgl + OpenGL的例子：http://www.songho.ca/opengl/gl_mvc.html

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