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wxWindows-2.4.0
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samples
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opengl
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penguin
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penguin.cpp
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C/C++ Source or Header
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2002-03-17
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6KB
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252 lines
/////////////////////////////////////////////////////////////////////////////
// Name: penguin.cpp
// Purpose: wxGLCanvas demo program
// Author: Robert Roebling
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id: penguin.cpp,v 1.6 2002/03/17 14:15:54 VZ Exp $
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifdef __GNUG__
#pragma implementation
#pragma interface
#endif
// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#if !wxUSE_GLCANVAS
#error Please set wxUSE_GLCANVAS to 1 in setup.h.
#endif
#include "penguin.h"
#ifdef __WXMAC__
# ifdef __DARWIN__
# include <OpenGL/glu.h>
# else
# include <glu.h>
# endif
#else
# include <GL/glu.h>
#endif
#define VIEW_ASPECT 1.3
/* `Main program' equivalent, creating windows and returning main app frame */
bool MyApp::OnInit(void)
{
/* Create the main frame window */
MyFrame *frame = new MyFrame(NULL, "wxWindows OpenGL Demo", wxPoint(50, 50), wxSize(400, 300));
/* Make a menubar */
wxMenu *fileMenu = new wxMenu;
fileMenu->Append(wxID_EXIT, "E&xit");
wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append(fileMenu, "&File");
frame->SetMenuBar(menuBar);
frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200), wxSUNKEN_BORDER);
/* Load file wiht mesh data */
frame->m_canvas->LoadLWO( "penguin.lwo" );
/* Show the frame */
frame->Show(TRUE);
return TRUE;
}
IMPLEMENT_APP(MyApp)
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(wxID_EXIT, MyFrame::OnExit)
END_EVENT_TABLE()
/* My frame constructor */
MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
const wxSize& size, long style):
wxFrame(frame, -1, title, pos, size, style)
{
m_canvas = NULL;
}
/* Intercept menu commands */
void MyFrame::OnExit(wxCommandEvent& event)
{
Destroy();
}
BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
EVT_SIZE(TestGLCanvas::OnSize)
EVT_PAINT(TestGLCanvas::OnPaint)
EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
EVT_MOUSE_EVENTS(TestGLCanvas::OnMouse)
END_EVENT_TABLE()
TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
const wxPoint& pos, const wxSize& size, long style, const wxString& name):
wxGLCanvas(parent, id, pos, size, style, name)
{
block = FALSE;
}
TestGLCanvas::~TestGLCanvas(void)
{
/* destroy mesh */
lw_object_free(info.lwobject);
}
void TestGLCanvas::OnPaint( wxPaintEvent& event )
{
/* must always be here */
wxPaintDC dc(this);
#ifndef __WXMOTIF__
if (!GetContext()) return;
#endif
SetCurrent();
/* initialize OpenGL */
if (info.do_init == TRUE)
{
InitGL();
info.do_init = FALSE;
}
/* view */
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( info.zoom, VIEW_ASPECT, 1, 100 );
glMatrixMode( GL_MODELVIEW );
/* clear */
glClearColor( .3, .4, .6, 1 );
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
/* transformations */
GLfloat m[4][4];
glLoadIdentity();
glTranslatef( 0, 0, -30 );
build_rotmatrix( m,info.quat );
glMultMatrixf( &m[0][0] );
/* draw object */
lw_object_show( info.lwobject );
/* flush */
glFlush();
/* swap */
SwapBuffers();
}
void TestGLCanvas::OnSize(wxSizeEvent& event)
{
// this is also necessary to update the context on some platforms
wxGLCanvas::OnSize(event);
// set GL viewport (not called by wxGLCanvas::OnSize on all platforms...)
int w, h;
GetClientSize(&w, &h);
#ifndef __WXMOTIF__
if (GetContext())
#endif
{
SetCurrent();
glViewport(0, 0, (GLint) w, (GLint) h);
}
}
void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
{
/* Do nothing, to avoid flashing on MSW */
}
void TestGLCanvas::LoadLWO(const wxString &filename)
{
/* test if lightwave object */
if (!lw_is_lwobject(filename)) return;
/* read lightwave object */
lwObject *lwobject = lw_object_read(filename);
/* scale */
lw_object_scale(lwobject, 10.0 / lw_object_radius(lwobject));
/* set up mesh info */
info.do_init = TRUE;
info.lwobject = lwobject;
info.beginx = 0;
info.beginy = 0;
info.zoom = 45;
trackball( info.quat, 0.0, 0.0, 0.0, 0.0 );
}
void TestGLCanvas::OnMouse( wxMouseEvent& event )
{
wxSize sz(GetClientSize());
if (event.Dragging())
{
/* drag in progress, simulate trackball */
float spin_quat[4];
trackball(spin_quat,
(2.0*info.beginx - sz.x) / sz.x,
( sz.y - 2.0*info.beginy) / sz.y,
( 2.0*event.GetX() - sz.x) / sz.x,
( sz.y - 2.0*event.GetY()) / sz.y);
add_quats( spin_quat, info.quat, info.quat );
/* orientation has changed, redraw mesh */
Refresh(FALSE);
}
info.beginx = event.GetX();
info.beginy = event.GetY();
}
void TestGLCanvas::InitGL(void)
{
GLfloat light0_pos[4] = { -50.0, 50.0, 0.0, 0.0 };
GLfloat light0_color[4] = { .6, .6, .6, 1.0 }; /* white light */
GLfloat light1_pos[4] = { 50.0, 50.0, 0.0, 0.0 };
GLfloat light1_color[4] = { .4, .4, 1, 1.0 }; /* cold blue light */
/* remove back faces */
glDisable(GL_CULL_FACE);
glEnable(GL_DEPTH_TEST);
/* speedups */
glEnable(GL_DITHER);
glShadeModel(GL_SMOOTH);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_FASTEST);
glHint(GL_POLYGON_SMOOTH_HINT, GL_FASTEST);
/* light */
glLightfv(GL_LIGHT0, GL_POSITION, light0_pos);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light0_color);
glLightfv(GL_LIGHT1, GL_POSITION, light1_pos);
glLightfv(GL_LIGHT1, GL_DIFFUSE, light1_color);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHTING);
glColorMaterial(GL_FRONT_AND_BACK,GL_AMBIENT_AND_DIFFUSE);
glEnable(GL_COLOR_MATERIAL);
}