C++学习（二九九）undefined reference to `glActiveShaderProgramEXT‘
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缺少动态库，添加D:\\android-ndk-r19c\\toolchains\\llvm\\prebuilt\\windows-x86_64\\sysroot\\usr\\lib\\aarch64-linux-android\\28\\libGLESv3.so
According to the Khronos OpenGL ES Registry, the extension header for GLES 3.0 is actually <GLES2/gl2ext.h>. gl3ext.h should be empty and provided only for legacy compatibility. Thus, if you want to include GLES 3.0 headers, you should do:
#include <GLES3/gl3.h>
#include <GLES2/gl2ext.h>
gl3ext.h的内容，为空
#ifndef __gl3ext_h_
#define __gl3ext_h_
/* $Revision: 17809 $ on $Date:: 2012-05-14 08:03:36 -0700 #$ */
/*
* This document is licensed under the SGI Free Software B License Version
* 2.0. For details, see http://oss.sgi.com/projects/FreeB/ .
*/
/* OpenGL ES 3 Extensions
*
* After an OES extension's interactions with OpenGl ES 3.0 have been documented,
* its tokens and function definitions should be added to this file in a manner
* that does not conflict with gl2ext.h or gl3.h.
*
* Tokens and function definitions for extensions that have become standard
* features in OpenGL ES 3.0 will not be added to this file.
*
* Applications using OpenGL-ES-2-only extensions should include gl2ext.h
*/
#endif /* __gl3ext_h_ */
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