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POHow to get OpenGL ES2 to compile with Qt
 

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  1. POHow to get OpenGL ES2 to compile with Qt
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    <p>I'm trying to figure out how to get my Qt program to compile and link against OpenGL ES2 functions.</p> <p>I've created a simple program that uses a QGLWidget to draw some simple triangles in my Qt application using the old OpenGL 1.0 pipeline. I'd like to use advanced 2.0 features like VBOs and shaders, so I started simply enough by trying to allocate some buffers for a VBO:</p> <pre><code>int ids[2]; glGenBuffers(2, ids); </code></pre> <p>Unfortunately, my project cannot find glGenBuffers() and I get the error message</p> <pre><code>GlWidget.cpp:103: error: 'glGenBuffers' was not declared in this scope </code></pre> <p>The start of qgl.h had the line "#elif defined(QT_OPENGL_ES_2)", so I tried setting that for the preprocessor, but it still couldn't find glGenBuffers().</p> <p>I'm not sure what to try next. Please let me know how I can get my Qt program to use OpenGL ES2.</p> <p>Here's the output I get when I compile:</p> <pre><code>"/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE=/C/Qt/2010.02.1/qt/bin/qmake.exe SUBPROJECTS= .build-conf make[1]: Entering directory `/c/dev/kitfox.com/biz/monsterRacing/proj/CharacterEditor' /C/Qt/2010.02.1/qt/bin/qmake.exe VPATH=. -o qttmp-Debug.mk nbproject/qt-Debug.pro mv -f qttmp-Debug.mk nbproject/qt-Debug.mk "/usr/bin/make" -f nbproject/qt-Debug.mk dist/Debug/MinGW-Windows/CharacterEditor.exe make[2]: Entering directory `/c/dev/kitfox.com/biz/monsterRacing/proj/CharacterEditor' g++.exe -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I'c:/Qt/2010.02.1/qt/include/QtCore' -I'c:/Qt/2010.02.1/qt/include/QtGui' -I'c:/Qt/2010.02.1/qt/include/QtOpenGL' -I'c:/Qt/2010.02.1/qt/include' -I'c:/Qt/2010.02.1/qt/include/ActiveQt' -I'.' -I'.' -I'nbproject' -I'.' -I'c:/Qt/2010.02.1/qt/mkspecs/default' -o build/Debug/MinGW-Windows/main.o main.cpp g++.exe -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I'c:/Qt/2010.02.1/qt/include/QtCore' -I'c:/Qt/2010.02.1/qt/include/QtGui' -I'c:/Qt/2010.02.1/qt/include/QtOpenGL' -I'c:/Qt/2010.02.1/qt/include' -I'c:/Qt/2010.02.1/qt/include/ActiveQt' -I'.' -I'.' -I'nbproject' -I'.' -I'c:/Qt/2010.02.1/qt/mkspecs/default' -o build/Debug/MinGW-Windows/MainForm.o MainForm.cpp MainForm.cpp: In member function 'void MainForm::openFile()': MainForm.cpp:78: warning: unused variable 'surfSet' g++.exe -c -g -frtti -fexceptions -mthreads -Wall -DUNICODE -DQT_LARGEFILE_SUPPORT -DQT_DLL -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_THREAD_SUPPORT -DQT_NEEDS_QMAIN -I'c:/Qt/2010.02.1/qt/include/QtCore' -I'c:/Qt/2010.02.1/qt/include/QtGui' -I'c:/Qt/2010.02.1/qt/include/QtOpenGL' -I'c:/Qt/2010.02.1/qt/include' -I'c:/Qt/2010.02.1/qt/include/ActiveQt' -I'.' -I'.' -I'nbproject' -I'.' -I'c:/Qt/2010.02.1/qt/mkspecs/default' -o build/Debug/MinGW-Windows/GlWidget.o GlWidget.cpp GlWidget.cpp: In member function 'void GlWidget::buildMesh()': GlWidget.cpp:103: error: 'glGenBuffers' was not declared in this scope make[2]: Leaving directory `/c/dev/kitfox.com/biz/monsterRacing/proj/CharacterEditor' make[2]: *** [build/Debug/MinGW-Windows/GlWidget.o] Error 1 make[1]: *** [.build-conf] Error 2 make: *** [.build-impl] Error 2 make[1]: Leaving directory `/c/dev/kitfox.com/biz/monsterRacing/proj/CharacterEditor' </code></pre>
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    1. PTQuestion
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    1. USkitfox
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    1. COWhich OpenGL ES 2.0 implementation are you using?
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      1. POHow to get OpenGL ES2 to compile with Qt
      1. USgenpfault
    2. COWhat is your platform? OpenGL ES is for Embedded Systems.
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      1. POHow to get OpenGL ES2 to compile with Qt
      1. USLuca Carlon
    3. COI'm not sure. Whatever came with Qt when I installed it. I'm using Qt 4.6.2 with MinGW. Pretty much, I followed the instructions on this page: http://netbeans.org/kb/docs/cnd/qt-applications.html
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      1. POHow to get OpenGL ES2 to compile with Qt
      1. USkitfox
 

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