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131 lines
2.7 KiB
131 lines
2.7 KiB
13 years ago
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#ifndef __openglhelper_2003_06_06_15_49__
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#define __openglhelper_2003_06_06_15_49__
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#include "qglobal.h"
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#if QT_VERSION < 0x040000
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#include <qgl.h>
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#else
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#include <QtOpenGL/qgl.h>
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#endif
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namespace Qwt3D
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{
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#ifndef QWT3D_NOT_FOR_DOXYGEN
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class GLStateBewarer
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{
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public:
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GLStateBewarer(GLenum what, bool on, bool persist=false)
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{
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state_ = what;
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stateval_ = glIsEnabled(what);
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if (on)
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turnOn(persist);
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else
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turnOff(persist);
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}
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~GLStateBewarer()
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{
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if (stateval_)
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glEnable(state_);
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else
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glDisable(state_);
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}
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void turnOn(bool persist = false)
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{
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glEnable(state_);
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if (persist)
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stateval_ = true;
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}
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void turnOff(bool persist = false)
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{
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glDisable(state_);
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if (persist)
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stateval_ = false;
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}
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private:
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GLenum state_;
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bool stateval_;
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};
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inline const GLubyte* gl_error()
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{
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GLenum errcode;
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const GLubyte* err = 0;
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if ((errcode = glGetError()) != GL_NO_ERROR)
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{
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err = gluErrorString(errcode);
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}
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return err;
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}
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inline void SaveGlDeleteLists(GLuint& lstidx, GLsizei range)
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{
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if (glIsList(lstidx))
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glDeleteLists(lstidx, range);
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lstidx = 0;
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}
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//! get OpenGL transformation matrices
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/**
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Don't rely on (use) this in display lists !
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\param modelMatrix should be a GLdouble[16]
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\param projMatrix should be a GLdouble[16]
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\param viewport should be a GLint[4]
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*/
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inline void getMatrices(GLdouble* modelMatrix, GLdouble* projMatrix, GLint* viewport)
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{
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glGetIntegerv(GL_VIEWPORT, viewport);
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glGetDoublev(GL_MODELVIEW_MATRIX, modelMatrix);
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glGetDoublev(GL_PROJECTION_MATRIX, projMatrix);
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}
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//! simplified glut routine (glUnProject): windows coordinates_p --> object coordinates_p
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/**
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Don't rely on (use) this in display lists !
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*/
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inline bool ViewPort2World(double& objx, double& objy, double& objz, double winx, double winy, double winz)
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{
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GLdouble modelMatrix[16];
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GLdouble projMatrix[16];
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GLint viewport[4];
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getMatrices(modelMatrix, projMatrix, viewport);
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int res = gluUnProject(winx, winy, winz, modelMatrix, projMatrix, viewport, &objx, &objy, &objz);
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return (res == GL_FALSE) ? false : true;
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}
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//! simplified glut routine (glProject): object coordinates_p --> windows coordinates_p
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/**
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Don't rely on (use) this in display lists !
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*/
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inline bool World2ViewPort(double& winx, double& winy, double& winz, double objx, double objy, double objz )
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{
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GLdouble modelMatrix[16];
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GLdouble projMatrix[16];
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GLint viewport[4];
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getMatrices(modelMatrix, projMatrix, viewport);
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int res = gluProject(objx, objy, objz, modelMatrix, projMatrix, viewport, &winx, &winy, &winz);
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return (res == GL_FALSE) ? false : true;
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}
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#endif // QWT3D_NOT_FOR_DOXYGEN
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} // ns
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#endif
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