MacOS 10.6 上 Qt/OpenGL/GPU 应用程序的编译问题

Question

我尝试在 MacOS 10.6.8 上编译一个已经在 Linux/Debian 7.0 上运行的应用程序。此代码使用带有 GPU/OPenCL 和 OpenGL 库的 Qt 框架。

但是我在编译这个文件头（GLWidget.hpp）时遇到了问题（我把原始的Linux版本放在这里）：

#ifndef GLWIDGET_H
#define GLWIDGET_H                                                    

#include <QGLWidget>                                              
#include <GL/glu.h>
#include <QTimer>                                                     
#include "NBody.hpp"                                                  
#include "Timer.h"

 class GLWidget : public QGLWidget                                    
 {
     Q_OBJECT 

 public:      
     GLWidget(QWidget *parent = NULL);      



     ~GLWidget();

...

有了这个版本，我在 MacOS 上编译：

/usr/bin/g++-4.2 -c -pipe -O2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.6 -Wall -W -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/local/include -I/Developer/GPU\ Computing/OpenCL/common/inc -I/opt/local/share/qt4/mkspecs/macx-g++ -I. -I. -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I. -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers -I/System/Library/Frameworks/AGL.framework/Headers -I. -F/opt/local/Library/Frameworks -I//Developer/GPU\ Computing/shared/inc -I/System/Library/Frameworks/OpenCL.framework/Headers -o GLWidget.o GLWidget.cpp
GLWidget.cpp: In member function ‘virtual void GLWidget::initializeGL()’:
GLWidget.cpp:82: error: ‘GL_CLAMP_VERTEX_COLOR’ was not declared in this scope
GLWidget.cpp:82: error: ‘glClampColor’ was not declared in this scope
GLWidget.cpp: In function ‘bool loadPngImage(char*, int&, int&, bool&, GLubyte**)’:
GLWidget.cpp:297: error: ‘png_infopp_NULL’ was not declared in this scope
GLWidget.cpp:313: error: ‘png_infopp_NULL’ was not declared in this scope
GLWidget.cpp:347: error: ‘png_voidp_NULL’ was not declared in this scope
GLWidget.cpp:349: error: invalid use of incomplete type ‘struct png_info_def’
/opt/local/include/png.h:739: error: forward declaration of ‘struct png_info_def’
GLWidget.cpp:350: error: invalid use of incomplete type ‘struct png_info_def’
/opt/local/include/png.h:739: error: forward declaration of ‘struct png_info_def’
GLWidget.cpp:351: error: invalid use of incomplete type ‘struct png_info_def’
/opt/local/include/png.h:739: error: forward declaration of ‘struct png_info_def’
GLWidget.cpp:359: error: invalid use of incomplete type ‘struct png_info_def’
/opt/local/include/png.h:739: error: forward declaration of ‘struct png_info_def’
GLWidget.cpp:378: error: ‘png_infopp_NULL’ was not declared in this scope
GLWidget.cpp: In member function ‘void GLWidget::draw()’:
GLWidget.cpp:483: error: ‘GL_VERTEX_PROGRAM_POINT_SIZE_NV’ was not declared in this scope
make: *** [GLWidget.o] Error 1

实际上，glClampColor 函数并没有在作用域中声明。所以我搜索了这个函数的声明位置，我在这个文件中找到了它：

/Developer/GPU Computing/C/common/inc/GL/glew.h

然后，我将它添加到 PATH 中，并将其包含在 GLWidget.hpp 中：

#ifndef GLWIDGET_H
#define GLWIDGET_H

#include <QGLWidget>
#include <GL/glew.h>
#include <QTimer>
#include "NBody.hpp"
#include "Timer.h"

 class GLWidget : public QGLWidget
 {
     Q_OBJECT

 public:

     GLWidget(QWidget *parent = NULL);

     ~GLWidget();

但现在，我收到以下错误：

/opt/local/bin/uic DiskGal_IC.ui -o ui_DiskGal_IC.h
/opt/local/bin/uic YourGalaxy.ui -o ui_YourGalaxy.h
/usr/bin/g++-4.2 -c -pipe -O2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.6 -Wall -W -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED -I/opt/local/include -I/Developer/GPU\ Computing/OpenCL/common/inc -I/opt/local/share/qt4/mkspecs/macx-g++ -I. -I. -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I. -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers -I/System/Library/Frameworks/AGL.framework/Headers -I. -F/opt/local/Library/Frameworks -I//Developer/GPU\ Computing/shared/inc -I/System/Library/Frameworks/OpenCL.framework/Headers -o DiskGal_IC.o DiskGal_IC.cpp
In file included from GLWidget.hpp:5,
                 from YourGalaxy.h:30,
                 from DiskGal_IC.h:25,
                 from DiskGal_IC.cpp:1:
//Developer/GPU Computing/shared/inc/GL/glew.h:66:2: error: #error gl.h included before glew.h
//Developer/GPU Computing/shared/inc/GL/glew.h:69:2: error: #error glext.h included before glew.h
In file included from GLWidget.hpp:5,
                 from YourGalaxy.h:30,
                 from DiskGal_IC.h:25,
                 from DiskGal_IC.cpp:1:
//Developer/GPU Computing/shared/inc/GL/glew.h:5855: error: ‘GLint64EXT’ has not been declared
//Developer/GPU Computing/shared/inc/GL/glew.h:5856: error: ‘GLuint64EXT’ has not been declared
//Developer/GPU Computing/shared/inc/GL/glew.h:9020: error: ‘PFNGLCOPYTEXSUBIMAGE3DPROC’ does not name a type
//Developer/GPU Computing/shared/inc/GL/glew.h:9021: error: ‘PFNGLDRAWRANGEELEMENTSPROC’ does not name a type
//Developer/GPU Computing/shared/inc/GL/glew.h:9022: error: ‘PFNGLTEXIMAGE3DPROC’ does not name a type
//Developer/GPU Computing/shared/inc/GL/glew.h:9023: error: ‘PFNGLTEXSUBIMAGE3DPROC’ does not name a type
//Developer/GPU Computing/shared/inc/GL/glew.h:9025: error: ‘PFNGLACTIVETEXTUREPROC’ does not name a type
//Developer/GPU Computing/shared/inc/GL/glew.h:9026: error: ‘PFNGLCLIENTACTIVETEXTUREPROC’ does not name a type
...

我不知道该怎么做，我的 Makefile 已经由 qmake 生成，在我的 .pro 中，QT += opengl。之后，我对其进行了修改以包含其他标头/库，例如 OpenCL。这是这个 Makefile 的顶部：

CC            = /usr/bin/gcc-4.2
CXX           = /usr/bin/g++-4.2
DEFINES       = -DQT_NO_DEBUG -DQT_OPENGL_LIB -DQT_GUI_LIB -DQT_CORE_LIB -DQT_SHARED
CFLAGS        = -pipe -O2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.6 -Wall -W $(DEFINES)
CXXFLAGS      = -pipe -O2 -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.6 -Wall -W $(DEFINES)
GPU        = /Developer/GPU\ Computing
INC_GSL       = /opt/local/include
INCPATH       = -I$(INC_GSL) -I$(GPU)/OpenCL/common/inc -I/opt/local/share/qt4/mkspecs/macx-g++ -I. -I. -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I. -I/opt/local/Library/Frameworks/QtOpenGL.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtGui.framework/Versions/4/Headers -I/opt/local/Library/Frameworks/QtCore.framework/Versions/4/Headers -I/System/Library/Frameworks/OpenGL.framework/Versions/A/Headers -I/System/Library/Frameworks/AGL.framework/Headers -I. -F/opt/local/Library/Frameworks -I/$(GPU)/shared/inc -I/System/Library/Frameworks/OpenCL.framework/Headers
LINK          = /usr/bin/g++-4.2
LFLAGS        = -headerpad_max_install_names -arch x86_64 -Xarch_x86_64 -mmacosx-version-min=10.6
LIBS          = $(SUBLIBS) -F/opt/local/Library/Frameworks -F/opt/local/lib -F/System/Library/Frameworks -F/opt/local/Library/Frameworks -F/opt/local/lib -L/opt/local/lib -framework QtOpenGL -framework QtGui -framework QtCore -framework OpenGL -framework AGL -framework OpenCL -lgsl -lgslcblas -lfftw3 -L$(GPU)/shared/lib/darwin -lGLEW

Answer 1

不要在 OS X 上使用 GLEW。由于 OS X 实现 OpenGL 的方式，它不会完成太多工作 - 它提供的扩展都在编译时可用，不需要在运行时加载扩展。

如果您在 OS X 上编译软件时没有可用的扩展，那么您就不走运了，因为该平台旨在为任何 Apple 支持的所有硬件（Hackintosh 是另一回事）提供同质的功能集。给定版本，（例如，任何 OS X 10.8 安装都将提供 OpenGL 3.2 和相同的扩展集）。这就是为什么当您需要某些 OpenGL 功能时，您最终会选择 OS X 版本号。

话虽如此，如果您#include <OpenGL/gl3.h> 并在 OS X (10.7+) 上获取 OpenGL 3.2 核心上下文，glClampColor (...) 将被定义并可用。此外，如果您有 OpenGL 3.2 核心上下文，则不需要 GL_PROGRAM_POINT_SIZE_NV，它是 OpenGL 3.2 中的核心，并且非供应商特定令牌已从 GL_VERTEX_PROGRAM_POINT_SIZE 重命名为简单的 GL_PROGRAM_POINT_SIZE。