CCRenderTexture，GL11ExtensionPack，Libgdx如何 [英] CCRenderTexture,GL11ExtensionPack,Libgdx How TO

问题描述

我目前对工作的影响，如微小的翅膀的http://www.raywenderlich.com/3857/how-to-create-dynamic-textures-with-ccrendertexture ，并找到 CCRenderTexture 是解决方案。所以我想知道如何在Android这样的效果，最后我发现此链接
<一href=\"https://github.com/ZhouWeikuan/cocos2d/blob/master/cocos2d-android/src/org/cocos2d/opengl/CCRenderTexture.java\" rel=\"nofollow\">https://github.com/ZhouWeikuan/cocos2d/blob/master/cocos2d-android/src/org/cocos2d/opengl/CCRenderTexture.java
这表明，其 GL11ExtensionPack

I currently work on a effect such as "Tiny Wings" http://www.raywenderlich.com/3857/how-to-create-dynamic-textures-with-ccrendertexture ,and find CCRenderTexture is the solution. So I want to know how to make this effect on android , finally i found this link https://github.com/ZhouWeikuan/cocos2d/blob/master/cocos2d-android/src/org/cocos2d/opengl/CCRenderTexture.java It shows that its GL11ExtensionPack

GL11ExtensionPack egl = (GL11ExtensionPack)CCDirector.gl;
        egl.glGetIntegerv(GL11ExtensionPack.GL_FRAMEBUFFER_BINDING_OES, oldFBO_, 0);
...

但在GLWrapperBase.java，它显示了

But in GLWrapperBase.java ,it shows

// Unsupported GL11ExtensionPack methods
public void glBindFramebufferOES (int target, int framebuffer) {
        throw new UnsupportedOperationException();
}

似乎GDX have'nt实现这个功能。我想知道什么是libgdx相同功能或如何使用 GL11ExtensionPack 是在桌面〜
谢谢

Seems gdx have'nt implement this function . I want to know what's the same feature of libgdx or how to use GL11ExtensionPack at desktop ~ Thanks

推荐答案

在libGDX，要使用一个帧缓冲对象做一个CCRenderTexture的等价物。帧缓冲基本上让您使用OpenGL命令绘制到屏幕外缓冲区，然后就可以显示该缓冲区的内容作为纹理后。请参见 HTTP：//$c$c.google.com/p/libgdx/维基/ OpenGLFramebufferObject 。需要注意的是帧缓冲区对象仅当您的应用程序需要OpenGL ES 2.0。

In libGDX, you want to use a FrameBuffer object to do the equivalent of a "CCRenderTexture". The FrameBuffer basically lets you use OpenGL commands to draw into an off-screen buffer, and then you can display that buffer's contents as a texture later. See http://code.google.com/p/libgdx/wiki/OpenGLFramebufferObject. Note that the FrameBuffer object is only available if your app requires OpenGL ES 2.0.

根据你想画什么，你也可以看一下 像素图 类libGDX。这支持一些简单的运行时间绘制操作（如线，rectangels，并且像素）。同样的想法是，你吸引到这个纹理，再后来呈现在屏幕上产生的质感。这是在OpenGL ES 1.0可用了。

Depending on what you want to draw, you might also look at the Pixmap class in libGDX. This supports some simple run-time drawing operations (like lines, rectangels, and pixels). Again the idea is that you draw into this texture and then render the resulting texture on-screen later. This is available in OpenGL ES 1.0, too.

熟悉framebuffer和像素应该能正常运行在Android和桌面上的（我相信在GWT和iOS，太..）

Both FrameBuffer and Pixmap should work fine on Android and on the Desktop (and I believe on GWT and iOS, too..)

要认真了解在Android上会发生什么，当你的应用程序失去焦点暂时（OpenGL上下文缺失导致一些纹理内容消失）。

Be careful to understand what happens on Android when your app loses focus temporarily (OpenGL context loss causes some texture contents to disappear).

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