Question

我正在尝试在ubuntu 10.04中运行OpenGL示例。我勇敢地编写了如下的Qt代码，它非常棒。

./configure -prefix /home/user/Software/qt-4.7.4-openGL-without-opengl-graphics -xplatform linux-g++-32  -little-endian -opensource -debug-and-release -fast -exceptions -accessibility -stl -no-qt3support -xmlpatterns -multimedia -audio-backend  -svg -webkit-debug -script -scripttools -declarative -qt-zlib -qt-libpng -qt-libjpeg -qt-libmng -qt-libtiff  -make translations -make tools -make libs -opengl desktop -lglut

但是出于满意，我从成功的编译中得到了我尝试运行示例，而有些则无法运行。作为开始，2dpainting示例在打印以下内容后退出。

hijackWindow() context created for Window(0xbf8b0f2c) 1 
QGLPixelBuffer: Unable to find a context/format match - giving up.
QGLWindowSurface: Failed to create valid pixelbuffer, falling back 
QGLWindowSurface: Using plain widget as window surface QGLWindowSurface(0x8bf4990) 
hijackWindow() context created for Widget(0x8be5ab0) 2 
Vertex shader for simpleShaderProg (MainVertexShader & PositionOnlyVertexShader)  failed to compile
Fragment shader for simpleShaderProg (MainFragmentShader & ShockingPinkSrcFragmentShader) failed to compile
QGLShaderProgram: shader programs are not supported 
The program has unexpectedly finished.

并且框示例甚至没有编译，给出以下错误。

qtbox.cpp: In member function 'virtual void QtBox::paint(QPainter*, const QStyleOptionGraphicsItem*, QWidget*)':
qtbox.cpp:327: error: 'gluPerspective' was not declared in this scope

有人可以告诉我这里做错了吗？

Answer 1

GluPerspective是GLU库的一部分，不支持更新的（3.x？）版本的OpenGL。更新示例的一种简单方法是编写自己的替换，如下所示：

#include <QtOpenGL>

void gluPerspective(double fovy,double aspect, double zNear, double zFar)
{
 // Start in projection mode.
 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 double xmin, xmax, ymin, ymax;
 ymax = zNear * tan(fovy * M_PI / 360.0);
 ymin = -ymax;
 xmin = ymin * aspect;
 xmax = ymax * aspect;
 glFrustum(xmin, xmax, ymin, ymax, zNear, zFar);
}

Answer 2

您尚未链接到-lGL

LIBS + = -lGLU

并在您的代码中包含glu.h文件。

包括“GL / glu.h”

Qt的OpenGL样本抱怨一些错误，不会运行

2 个答案: