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Diffstat (limited to 'examples/opengl/sharedbox/glbox.cpp')
| -rw-r--r-- | examples/opengl/sharedbox/glbox.cpp | 211 |
1 files changed, 211 insertions, 0 deletions
diff --git a/examples/opengl/sharedbox/glbox.cpp b/examples/opengl/sharedbox/glbox.cpp new file mode 100644 index 000000000..f3ded8888 --- /dev/null +++ b/examples/opengl/sharedbox/glbox.cpp @@ -0,0 +1,211 @@ +/**************************************************************************** +** +** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved. +** +** This file is part of an example program for TQt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +/**************************************************************************** +** +** This is a simple TQGLWidget displaying a box +** +** The OpenGL code is mostly borrowed from Brian Pauls "spin" example +** in the Mesa distribution +** +****************************************************************************/ + +#include "glbox.h" + +// Initialize static class variables: + +// Shared display list id: +GLuint GLBox::sharedDisplayList = 0; + +// Counter keeping track of number of GLBox instances sharing +// the display list, so that the last instance can delete it: +int GLBox::sharedListUsers = 0; + + +/*! + Create a GLBox widget +*/ + +GLBox::GLBox( TQWidget* parent, const char* name, const TQGLWidget* shareWidget ) + : TQGLWidget( parent, name, shareWidget ) +{ + xRot = yRot = zRot = 0.0; // default object rotation + scale = 1.0; // default object scale + object = 0; + localDisplayList = 0; +} + + +/*! + Set up the OpenGL rendering state. Robustly access shared display list. +*/ + +void GLBox::initializeGL() +{ + // Let OpenGL clear to black + qglClearColor( black ); + + glEnable(GL_DEPTH_TEST); + + if ( sharedListUsers == 0 ) { // No shared list has been made yet + sharedDisplayList = makeObject(); // Make one + object = sharedDisplayList; // Use it + sharedListUsers++; // Keep reference count + qDebug( "GLBox %s created shared display list.", name() ); + } + else { // There is a shared diplay list + if ( isSharing() ) { // Can we access it? + object = sharedDisplayList; // Yes, use it + sharedListUsers++; // Keep reference count + qDebug( "GLBox %s uses shared display list.", name() ); + } + else { + localDisplayList = makeObject(); // No, roll our own + object = localDisplayList; // and use that + qDebug( "GLBox %s uses private display list.", name() ); + } + } +} + + + +/*! + Release allocated resources +*/ + +GLBox::~GLBox() +{ + makeCurrent(); // We're going to do gl calls + if ( localDisplayList != 0 ) { // Did we make our own? + glDeleteLists( localDisplayList, 1 ); // Yes, delete it + qDebug( "GLBox %s deleted private display list.", name() ); + } + else { + sharedListUsers--; // No, we used the shared one; keep refcount + if ( sharedListUsers == 0 ) { // Any sharers left? + glDeleteLists( sharedDisplayList, 1 ); // No, delete it + sharedDisplayList = 0; + qDebug( "GLBox %s deleted shared display list.", name() ); + } + } +} + + +/*! + Paint the box. The actual openGL commands for drawing the box are + performed here. +*/ + +void GLBox::paintGL() +{ + glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ); + + glMatrixMode( GL_MODELVIEW ); + glLoadIdentity(); + glTranslatef( 0.0, 0.0, -3.0 ); + glScalef( scale, scale, scale ); + + glRotatef( xRot, 1.0, 0.0, 0.0 ); + glRotatef( yRot, 0.0, 1.0, 0.0 ); + glRotatef( zRot, 0.0, 0.0, 1.0 ); + + glCallList( object ); +} + + + + +/*! + Set up the OpenGL view port, matrix mode, etc. +*/ + +void GLBox::resizeGL( int w, int h ) +{ + glViewport( 0, 0, (GLint)w, (GLint)h ); + glMatrixMode( GL_PROJECTION ); + glLoadIdentity(); + glFrustum(-1.0, 1.0, -1.0, 1.0, 1.0, 10.0); +} + + +/*! + Generate an OpenGL display list for the object to be shown, i.e. the box +*/ + +GLuint GLBox::makeObject() +{ + GLuint list; + + list = glGenLists( 1 ); + + glNewList( list, GL_COMPILE ); + + glBegin(GL_QUADS); + /* Front face */ + qglColor( green ); + glVertex3f(-1.0, 1.0, 1.0); + glVertex3f(1.0, 1.0, 1.0); + glVertex3f(1.0, -1.0, 1.0); + glVertex3f(-1.0, -1.0, 1.0); + /* Back face */ + qglColor( yellow ); + glVertex3f(-1.0, 1.0, -1.0); + glVertex3f(1.0, 1.0, -1.0); + glVertex3f(1.0, -1.0, -1.0); + glVertex3f(-1.0, -1.0, -1.0); + /* Top side face */ + qglColor( blue ); + glVertex3f(-1.0, 1.0, 1.0); + glVertex3f(1.0, 1.0, 1.0); + glVertex3f(1.0, 1.0, -1.0); + glVertex3f(-1.0, 1.0, -1.0); + /* Bottom side face */ + qglColor( red ); + glVertex3f(-1.0, -1.0, 1.0); + glVertex3f(1.0, -1.0, 1.0); + glVertex3f(1.0, -1.0, -1.0); + glVertex3f(-1.0, -1.0, -1.0); + glEnd(); + glEndList(); + + return list; +} + + +/*! + Set the rotation angle of the object to \e degrees around the X axis. +*/ + +void GLBox::setXRotation( int degrees ) +{ + xRot = (GLfloat)(degrees % 360); + updateGL(); +} + + +/*! + Set the rotation angle of the object to \e degrees around the Y axis. +*/ + +void GLBox::setYRotation( int degrees ) +{ + yRot = (GLfloat)(degrees % 360); + updateGL(); +} + + +/*! + Set the rotation angle of the object to \e degrees around the Z axis. +*/ + +void GLBox::setZRotation( int degrees ) +{ + zRot = (GLfloat)(degrees % 360); + updateGL(); +} |