1 files changed, 130 insertions, 0 deletions
diff --git a/lib/tqwtplot3d/include/qwt3d_openglhelper.h b/lib/tqwtplot3d/include/qwt3d_openglhelper.h
new file mode 100644
index 0000000..e5499c2
--- /dev/null
+++ b/lib/tqwtplot3d/include/qwt3d_openglhelper.h
@@ -0,0 +1,130 @@
+#ifndef __openglhelper_2003_06_06_15_49__
+#define __openglhelper_2003_06_06_15_49__
+
+#include "qglobal.h"
+#if QT_VERSION < 0x040000
+#include <qgl.h>
+#else
+#include <QtOpenGL/qgl.h>
+#endif
+
+namespace Qwt3D
+{
+
+#ifndef QWT3D_NOT_FOR_DOXYGEN
+
+class GLStateBewarer
+{
+public:
+	
+	GLStateBewarer(GLenum what, bool on, bool persist=false)
+	{
+		state_ = what;
+		stateval_ = glIsEnabled(what);	
+		if (on)
+			turnOn(persist);
+		else
+			turnOff(persist);
+	}
+
+	~GLStateBewarer() 
+	{
+		if (stateval_)
+			glEnable(state_);
+		else
+			glDisable(state_);
+	}
+	
+	void turnOn(bool persist = false)
+	{
+		glEnable(state_);
+		if (persist)
+			stateval_ = true;
+	}
+	
+	void turnOff(bool persist = false)
+	{
+		glDisable(state_);
+		if (persist)
+			stateval_ = false;
+	}
+
+
+private:
+	
+	GLenum state_;
+	bool stateval_;
+
+};
+
+inline const GLubyte* gl_error()
+{
+	GLenum errcode;
+	const GLubyte* err = 0;
+	
+	if ((errcode = glGetError()) != GL_NO_ERROR)
+	{
+		err = gluErrorString(errcode);
+	}
+	return err;
+}
+
+inline	void SaveGlDeleteLists(GLuint& lstidx, GLsizei range)
+{
+	if (glIsList(lstidx))
+		glDeleteLists(lstidx, range);
+	lstidx = 0;
+}
+
+//! get OpenGL transformation matrices
+/**
+	Don't rely on (use) this in display lists !
+	\param modelMatrix should be a GLdouble[16]
+	\param projMatrix should be a GLdouble[16]
+	\param viewport should be a GLint[4]
+*/
+inline void getMatrices(GLdouble* modelMatrix, GLdouble* projMatrix, GLint* viewport)
+{
+	glGetIntegerv(GL_VIEWPORT, viewport);
+	glGetDoublev(GL_MODELVIEW_MATRIX,	modelMatrix);
+	glGetDoublev(GL_PROJECTION_MATRIX,	projMatrix);
+}
+
+//! simplified glut routine (glUnProject): windows coordinates_p --> object coordinates_p 
+/**
+	Don't rely on (use) this in display lists !
+*/
+inline bool ViewPort2World(double& objx, double& objy, double& objz, double winx, double winy, double winz)
+{
+	GLdouble modelMatrix[16];
+  GLdouble projMatrix[16];
+  GLint viewport[4];
+
+	getMatrices(modelMatrix, projMatrix, viewport);
+	int res = gluUnProject(winx, winy, winz, modelMatrix, projMatrix, viewport, &objx, &objy, &objz);
+
+	return (res == GL_FALSE) ? false : true;
+}
+
+//! simplified glut routine (glProject): object coordinates_p --> windows coordinates_p 
+/**
+	Don't rely on (use) this in display lists !
+*/
+inline bool World2ViewPort(double& winx, double& winy, double& winz, double objx, double objy, double objz )
+{
+	GLdouble modelMatrix[16];
+  GLdouble projMatrix[16];
+  GLint viewport[4];
+
+	getMatrices(modelMatrix, projMatrix, viewport);
+	int res = gluProject(objx, objy, objz, modelMatrix, projMatrix, viewport, &winx, &winy, &winz);
+
+	return (res == GL_FALSE) ? false : true;
+}
+
+
+#endif // QWT3D_NOT_FOR_DOXYGEN
+
+} // ns
+
+#endif