GLEW和Qt5标头的重新定义 [英] GLEW and Qt5 redefinition of headers
问题描述
所以
将项目升级到Qt5后，我们遇到了问题.该应用程序链接了需要运行的库，并且在非Qt应用程序中使用库时可以正常运行.
After upgrading our prject to Qt5 we are experiencing issues with glew. The app links a library that needs glew to work, and that works fine when using the library in non Qt apps.
现在，尽管我们将库链接到qt应用程序中，并将其渲染为glwidget.这曾经工作，但现在没有.我们会收到大量错误，这些错误大多说重新定义"某些东西.这里有一些例子:
Now though we are linking the library into a qt app and rendering into a glwidget. This used to work but now it doesnt. We get a huge array of errors that mostly say "redefinition of" something. Here's some examples:
1>c:\glew-1.9.0\include\gl\glew.h(275): error C2371: 'GLdouble' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtgui\qopengl.h(71) : see declaration of 'GLdouble'
1>c:\glew-1.9.0\include\gl\glew.h(630): warning C4005: 'GL_DOUBLE' : macro redefinition
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtgui\qopengl.h(68) : see previous definition of 'GL_DOUBLE'
1>c:\glew-1.9.0\include\gl\glew.h(1655): error C2371: 'GLintptr' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(38) : see declaration of 'GLintptr'
1>c:\glew-1.9.0\include\gl\glew.h(1656): error C2371: 'GLsizeiptr' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(39) : see declaration of 'GLsizeiptr'
1>c:\glew-1.9.0\include\gl\glew.h(1707): warning C4005: 'GL_BLEND_EQUATION_RGB' : macro redefinition
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(96) : see previous definition of 'GL_BLEND_EQUATION_RGB'
1>c:\glew-1.9.0\include\gl\glew.h(11533): warning C4005: 'GL_COVERAGE_SAMPLES_NV' : macro redefinition
您明白了.无论如何，我怎样才能阻止Qt包含它的gl内容，以便让glt可以自己工作?
You get the idea. Anyway how can I stop Qt including its gl stuff so glew can work by itself?
如您所见，gles是一个问题，所以我被指示使用此方法:
As you can see gles is being a problem, so I was directed to use this:
#define QT_NO_OPENGL_ES_2
但这根本没有效果.还有其他错误不会引用这些错误:
But this has no effect at all. There are other errors that don't reference gles like these:
1>c:\glew-1.9.0\include\gl\glew.h(275): error C2371: 'GLdouble' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtgui\qopengl.h(71) : see declaration of 'GLdouble'
1>c:\glew-1.9.0\include\gl\glew.h(630): warning C4005: 'GL_DOUBLE' : macro redefinition
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtgui\qopengl.h(68) : see previous definition of 'GL_DOUBLE'
1>c:\glew-1.9.0\include\gl\glew.h(1655): error C2371: 'GLintptr' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(38) : see declaration of 'GLintptr'
1>c:\glew-1.9.0\include\gl\glew.h(1656): error C2371: 'GLsizeiptr' : redefinition; different basic types
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(39) : see declaration of 'GLsizeiptr'
1>c:\glew-1.9.0\include\gl\glew.h(1707): warning C4005: 'GL_BLEND_EQUATION_RGB' : macro redefinition
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\gles2\gl2.h(96) : see previous definition of 'GL_BLEND_EQUATION_RGB'
1>c:\glew-1.9.0\include\gl\glew.h(11533): warning C4005: 'GL_COVERAGE_SAMPLES_NV' : macro redefinition
1> c:\qt\qt5.0.2\5.0.2\msvc2012_64\include\qtgui\qopengles2ext.h(530) : see previous definition of 'GL_COVERAGE_SAMPLES_NV'
希望您能提供帮助！
推荐答案
经过一天的苦苦挣扎，我有一个解决方案！
After a day of screwing around I have a solution!
为了跨平台，Qt似乎已将OpenGLES设置为比桌面openGL更高的优先级.
In order to be cross platform Qt seems to have set OpenGLES to a high priority than desktop openGL.
此问题的解决方案是在构建之前使用设置-opengl desktop从源代码构建Qt.像这样:
THe solution to this is to build Qt from source code suing the setting -opengl desktop before you build. Something like this:
configure -debug-and-release -opengl desktop
然后使用nmake进行构建，效果很好！
Then use nmake to build and it works fine!
这篇关于GLEW和Qt5标头的重新定义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
