[wxWidgets.git] / samples / opengl / isosurf / isosurf.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        isosurf.cpp
// Purpose:     wxGLCanvas demo program
// Author:      Brian Paul (original gltk version), Wolfram Gloger
// Modified by: Julian Smart
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// 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 "wx/timer.h"
#include "wx/glcanvas.h"

#include <GL/gl.h>
#include <GL/glu.h>

#include "isosurf.h"

// The following part is taken largely unchanged from the original C Version

#include <math.h>

GLboolean speed_test = GL_FALSE;
GLboolean use_vertex_arrays = GL_FALSE;

GLboolean doubleBuffer = GL_TRUE;

GLboolean smooth = GL_TRUE;
GLboolean lighting = GL_TRUE;


#define MAXVERTS 10000

static GLfloat verts[MAXVERTS][3];
static GLfloat norms[MAXVERTS][3];
static GLint numverts;

static GLfloat xrot;
static GLfloat yrot;


static void read_surface( char *filename )
{
   FILE *f;

   f = fopen(filename,"r");
   if (!f) {
      wxString msg("Couldn't read ");
      msg += filename;
      wxMessageBox(msg);
      return;
   }

   numverts = 0;
   while (!feof(f) && numverts<MAXVERTS) {
      fscanf( f, "%f %f %f  %f %f %f",
	      &verts[numverts][0], &verts[numverts][1], &verts[numverts][2],
	      &norms[numverts][0], &norms[numverts][1], &norms[numverts][2] );
      numverts++;
   }
   numverts--;

   printf("%d vertices, %d triangles\n", numverts, numverts-2);
   fclose(f);
}


static void draw_surface( void )
{
   GLint i;

#ifdef GL_EXT_vertex_array
   if (use_vertex_arrays) {
      glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
   }
   else {
#endif
      glBegin( GL_TRIANGLE_STRIP );
      for (i=0;i<numverts;i++) {
         glNormal3fv( norms[i] );
         glVertex3fv( verts[i] );
      }
      glEnd();
#ifdef GL_EXT_vertex_array
   }
#endif
}


static void draw1(void)
{
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
    glPushMatrix();
    glRotatef( yrot, 0.0, 1.0, 0.0 );
    glRotatef( xrot, 1.0, 0.0, 0.0 );

    draw_surface();

    glPopMatrix();

    glFlush();
}


static void InitMaterials(void)
{
    static float ambient[] = {0.1, 0.1, 0.1, 1.0};
    static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
    static float position0[] = {0.0, 0.0, 20.0, 0.0};
    static float position1[] = {0.0, 0.0, -20.0, 0.0};
    static float front_mat_shininess[] = {60.0};
    static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
    static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
    /*
    static float back_mat_shininess[] = {60.0};
    static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
    static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
    */
    static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
    static float lmodel_twoside[] = {GL_FALSE};

    glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
    glLightfv(GL_LIGHT0, GL_POSITION, position0);
    glEnable(GL_LIGHT0);
    
    glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
    glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
    glLightfv(GL_LIGHT1, GL_POSITION, position1);
    glEnable(GL_LIGHT1);
    
    glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
    glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
    glEnable(GL_LIGHTING);

    glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
    glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
    glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
}


static void Init(void)
{
   glClearColor(0.0, 0.0, 0.0, 0.0);

   glShadeModel(GL_SMOOTH);
   glEnable(GL_DEPTH_TEST);

   InitMaterials();

   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );

   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
   glTranslatef( 0.0, 0.0, -6.0 );

#ifdef GL_EXT_vertex_array
   if (use_vertex_arrays) {
      glVertexPointerEXT( 3, GL_FLOAT, 0, numverts, verts );
      glNormalPointerEXT( GL_FLOAT, 0, numverts, norms );
      glEnable( GL_VERTEX_ARRAY_EXT );
      glEnable( GL_NORMAL_ARRAY_EXT );
   }
#endif
}


static void Reshape(int width, int height)
{
  glViewport(0, 0, (GLint)width, (GLint)height);
}


static GLenum Args(int argc, char **argv)
{
   GLint i;

   for (i = 1; i < argc; i++) {
      if (strcmp(argv[i], "-sb") == 0) {
         doubleBuffer = GL_FALSE;
      }
      else if (strcmp(argv[i], "-db") == 0) {
         doubleBuffer = GL_TRUE;
      }
      else if (strcmp(argv[i], "-speed") == 0) {
         speed_test = GL_TRUE;
         doubleBuffer = GL_TRUE;
      }
      else if (strcmp(argv[i], "-va") == 0) {
         use_vertex_arrays = GL_TRUE;
      }
      else {
         wxString msg("Bad option: ");
         msg += argv[i];
         wxMessageBox(msg);
         return GL_FALSE;
      }
   }

   return GL_TRUE;
}

// The following part was written for wxWindows 1.66
MyFrame *frame = NULL;

IMPLEMENT_APP(MyApp)

// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit(void)
{
  Args(argc, argv);

  // Create the main frame window
  frame = new MyFrame(NULL, "Isosurf GL Sample", wxPoint(50, 50), wxSize(200, 200));

  // Give it an icon
  frame->SetIcon(wxIcon("mondrian"));

  // Make a menubar
  wxMenu *fileMenu = new wxMenu;

  fileMenu->Append(wxID_EXIT, "E&xit");
  wxMenuBar *menuBar = new wxMenuBar;
  menuBar->Append(fileMenu, "&File");
  frame->SetMenuBar(menuBar);

  // Make a TestGLCanvas

  // JACS
#ifdef __WXMSW__
  int *gl_attrib = NULL;
#else
  int gl_attrib[20] = { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
			WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
			WX_GL_DOUBLEBUFFER, None };
#endif

  if(!doubleBuffer)
   {
      printf("don't have double buffer, disabling\n");
#ifdef __WXGTK__
      gl_attrib[9] = None;
#endif
      doubleBuffer = GL_FALSE;
  }
 
  frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200),
                                     0, "TestGLCanvas", gl_attrib );

  // Show the frame
  frame->Show(TRUE);

  frame->m_canvas->SetCurrent();
  read_surface( "isosurf.dat" );

  Init();

  return TRUE;
}

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();
}

/*
 * TestGLCanvas implementation
 */

BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
    EVT_SIZE(TestGLCanvas::OnSize)
    EVT_PAINT(TestGLCanvas::OnPaint)
    EVT_CHAR(TestGLCanvas::OnChar)
    EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
    EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
END_EVENT_TABLE()

TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
    const wxPoint& pos, const wxSize& size, long style, const wxString& name, int* gl_attrib):
  wxGLCanvas(parent, id, pos, size, style, name, gl_attrib)
{
   parent->Show(TRUE);
   SetCurrent();

   /* Make sure server supports the vertex array extension */
   char* extensions = (char *) glGetString( GL_EXTENSIONS );
   if (!extensions || !strstr( extensions, "GL_EXT_vertex_array" )) {
      use_vertex_arrays = GL_FALSE;
   }
}


TestGLCanvas::~TestGLCanvas(void)
{
}

void TestGLCanvas::OnPaint( wxPaintEvent& event )
{
    // This is a dummy, to avoid an endless succession of paint messages.
    // OnPaint handlers must always create a wxPaintDC.
    wxPaintDC dc(this);

#ifndef __WXMOTIF__
    if (!GetContext()) return;
#endif

    SetCurrent();

    draw1();
    SwapBuffers();
}

void TestGLCanvas::OnSize(wxSizeEvent& event)
{
#ifndef __WXMOTIF__
    if (!GetContext()) return;
#endif

    SetCurrent();
    int width, height;
    GetClientSize(& width, & height);
    Reshape(width, height);
}

void TestGLCanvas::OnChar(wxKeyEvent& event)
{
    switch(event.KeyCode()) {
    case WXK_ESCAPE:
	exit(0);
    case WXK_LEFT:
	yrot -= 15.0;
	break;
    case WXK_RIGHT:
	yrot += 15.0;
	break;
    case WXK_UP:
	xrot += 15.0;
	break;
    case WXK_DOWN:
	xrot -= 15.0;
	break;
    case 's': case 'S':
	smooth = !smooth;
	if (smooth) {
	    glShadeModel(GL_SMOOTH);
	} else {
	    glShadeModel(GL_FLAT);
	}
	break;
    case 'l': case 'L':
	lighting = !lighting;
	if (lighting) {
	    glEnable(GL_LIGHTING);
	} else {
	    glDisable(GL_LIGHTING);
	}
	break;
     default:
      {
        event.Skip();
	return;
      }
    }

    Refresh(FALSE);
}

void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
{
    static int dragging = 0;
    static float last_x, last_y;

    //printf("%f %f %d\n", event.GetX(), event.GetY(), (int)event.LeftIsDown());
    if(event.LeftIsDown()) {
	if(!dragging) {
	    dragging = 1;
	} else {
	    yrot += (event.GetX() - last_x)*1.0;
	    xrot += (event.GetY() - last_y)*1.0;
	    Refresh(FALSE);
	}
	last_x = event.GetX();
	last_y = event.GetY();
    } else
	dragging = 0;
}

void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
{
    // Do nothing, to avoid flashing.
}
Commit	Line	Data
8b089c5e JS	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: isosurf.cpp
	3	// Purpose: wxGLCanvas demo program
	4	// Author: Brian Paul (original gltk version), Wolfram Gloger
	5	// Modified by: Julian Smart
	6	// Created: 04/01/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) Julian Smart
	9	// Licence: wxWindows licence
	10	/////////////////////////////////////////////////////////////////////////////
	11
	12	#ifdef __GNUG__
	13	#pragma implementation
	14	#pragma interface
	15	#endif
	16
	17	// For compilers that support precompilation, includes "wx.h".
	18	#include "wx/wxprec.h"
	19
	20	#ifdef __BORLANDC__
	21	#pragma hdrstop
	22	#endif
	23
	24	#ifndef WX_PRECOMP
	25	#include "wx/wx.h"
	26	#endif
	27
5fa399c9 JS	28	#if !wxUSE_GLCANVAS
	29	#error Please set wxUSE_GLCANVAS to 1 in setup.h.
	30	#endif
	31
8b089c5e JS	32	#include "wx/timer.h"
	33	#include "wx/glcanvas.h"
	34
	35	#include <GL/gl.h>
	36	#include <GL/glu.h>
	37
	38	#include "isosurf.h"
	39
	40	// The following part is taken largely unchanged from the original C Version
	41
	42	#include <math.h>
	43
	44	GLboolean speed_test = GL_FALSE;
	45	GLboolean use_vertex_arrays = GL_FALSE;
	46
	47	GLboolean doubleBuffer = GL_TRUE;
	48
	49	GLboolean smooth = GL_TRUE;
	50	GLboolean lighting = GL_TRUE;
	51
	52
	53	#define MAXVERTS 10000
	54
	55	static GLfloat verts[MAXVERTS][3];
	56	static GLfloat norms[MAXVERTS][3];
	57	static GLint numverts;
	58
	59	static GLfloat xrot;
	60	static GLfloat yrot;
	61
	62
	63	static void read_surface( char *filename )
	64	{
	65	FILE *f;
	66
	67	f = fopen(filename,"r");
	68	if (!f) {
	69	wxString msg("Couldn't read ");
	70	msg += filename;
	71	wxMessageBox(msg);
	72	return;
	73	}
	74
	75	numverts = 0;
	76	while (!feof(f) && numverts<MAXVERTS) {
	77	fscanf( f, "%f %f %f %f %f %f",
	78	&verts[numverts][0], &verts[numverts][1], &verts[numverts][2],
	79	&norms[numverts][0], &norms[numverts][1], &norms[numverts][2] );
	80	numverts++;
	81	}
	82	numverts--;
	83
	84	printf("%d vertices, %d triangles\n", numverts, numverts-2);
	85	fclose(f);
	86	}
	87
	88
	89	static void draw_surface( void )
	90	{
	91	GLint i;
	92
	93	#ifdef GL_EXT_vertex_array
	94	if (use_vertex_arrays) {
	95	glDrawArraysEXT( GL_TRIANGLE_STRIP, 0, numverts );
96	}
97	else {
98	#endif
99	glBegin( GL_TRIANGLE_STRIP );
100	for (i=0;i<numverts;i++) {
101	glNormal3fv( norms[i] );
102	glVertex3fv( verts[i] );
103	}
104	glEnd();
105	#ifdef GL_EXT_vertex_array
106	}
107	#endif
108	}
109
110
111	static void draw1(void)
112	{
113	glClear( GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT );
114	glPushMatrix();
115	glRotatef( yrot, 0.0, 1.0, 0.0 );
116	glRotatef( xrot, 1.0, 0.0, 0.0 );
117
118	draw_surface();
119
120	glPopMatrix();
121
122	glFlush();
123	}
124
125
126	static void InitMaterials(void)
127	{
128	static float ambient[] = {0.1, 0.1, 0.1, 1.0};
129	static float diffuse[] = {0.5, 1.0, 1.0, 1.0};
130	static float position0[] = {0.0, 0.0, 20.0, 0.0};
131	static float position1[] = {0.0, 0.0, -20.0, 0.0};
132	static float front_mat_shininess[] = {60.0};
133	static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0};
134	static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0};
135	/*
136	static float back_mat_shininess[] = {60.0};
137	static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0};
138	static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0};
139	*/
140	static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0};
141	static float lmodel_twoside[] = {GL_FALSE};
142
143	glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
144	glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
145	glLightfv(GL_LIGHT0, GL_POSITION, position0);
146	glEnable(GL_LIGHT0);
147
148	glLightfv(GL_LIGHT1, GL_AMBIENT, ambient);
149	glLightfv(GL_LIGHT1, GL_DIFFUSE, diffuse);
150	glLightfv(GL_LIGHT1, GL_POSITION, position1);
151	glEnable(GL_LIGHT1);
152
153	glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
154	glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
155	glEnable(GL_LIGHTING);
156
157	glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, front_mat_shininess);
158	glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, front_mat_specular);
159	glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, front_mat_diffuse);
160	}
161
162
163	static void Init(void)
164	{
165	glClearColor(0.0, 0.0, 0.0, 0.0);
166
167	glShadeModel(GL_SMOOTH);
168	glEnable(GL_DEPTH_TEST);
169
170	InitMaterials();
171
172	glMatrixMode(GL_PROJECTION);
173	glLoadIdentity();
174	glFrustum( -1.0, 1.0, -1.0, 1.0, 5, 25 );
175
176	glMatrixMode(GL_MODELVIEW);
177	glLoadIdentity();
178	glTranslatef( 0.0, 0.0, -6.0 );
179
180	#ifdef GL_EXT_vertex_array
181	if (use_vertex_arrays) {
182	glVertexPointerEXT( 3, GL_FLOAT, 0, numverts, verts );
183	glNormalPointerEXT( GL_FLOAT, 0, numverts, norms );
184	glEnable( GL_VERTEX_ARRAY_EXT );
185	glEnable( GL_NORMAL_ARRAY_EXT );
186	}
187	#endif
188	}
189
190
191	static void Reshape(int width, int height)
192	{
193	glViewport(0, 0, (GLint)width, (GLint)height);
194	}
195
196
197	static GLenum Args(int argc, char **argv)
198	{
199	GLint i;
200
201	for (i = 1; i < argc; i++) {
202	if (strcmp(argv[i], "-sb") == 0) {
203	doubleBuffer = GL_FALSE;
204	}
205	else if (strcmp(argv[i], "-db") == 0) {
206	doubleBuffer = GL_TRUE;
207	}
208	else if (strcmp(argv[i], "-speed") == 0) {
209	speed_test = GL_TRUE;
210	doubleBuffer = GL_TRUE;
211	}
212	else if (strcmp(argv[i], "-va") == 0) {
213	use_vertex_arrays = GL_TRUE;
214	}
215	else {
216	wxString msg("Bad option: ");
217	msg += argv[i];
218	wxMessageBox(msg);
219	return GL_FALSE;
220	}
221	}
222
223	return GL_TRUE;
224	}
225
226	// The following part was written for wxWindows 1.66
227	MyFrame *frame = NULL;
228
229	IMPLEMENT_APP(MyApp)
230
231	// `Main program' equivalent, creating windows and returning main app frame
232	bool MyApp::OnInit(void)
233	{
234	Args(argc, argv);
235
236	// Create the main frame window
237	frame = new MyFrame(NULL, "Isosurf GL Sample", wxPoint(50, 50), wxSize(200, 200));
238
239	// Give it an icon
240	frame->SetIcon(wxIcon("mondrian"));
241
242	// Make a menubar
243	wxMenu *fileMenu = new wxMenu;
244
245	fileMenu->Append(wxID_EXIT, "E&xit");
246	wxMenuBar *menuBar = new wxMenuBar;
247	menuBar->Append(fileMenu, "&File");
248	frame->SetMenuBar(menuBar);
249
250	// Make a TestGLCanvas
251
252	// JACS
253	#ifdef __WXMSW__
254	int *gl_attrib = NULL;
255	#else
919ae91a UN	256	int gl_attrib[20] = { WX_GL_RGBA, WX_GL_MIN_RED, 1, WX_GL_MIN_GREEN, 1,
	257	WX_GL_MIN_BLUE, 1, WX_GL_DEPTH_SIZE, 1,
	258	WX_GL_DOUBLEBUFFER, None };
8b089c5e JS	259	#endif
	260
	261	if(!doubleBuffer)
	262	{
	263	printf("don't have double buffer, disabling\n");
	264	#ifdef __WXGTK__
	265	gl_attrib[9] = None;
	266	#endif
	267	doubleBuffer = GL_FALSE;
	268	}
919ae91a UN	269
	270	frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200),
	271	0, "TestGLCanvas", gl_attrib );
8b089c5e JS	272
	273	// Show the frame
	274	frame->Show(TRUE);
	275
	276	frame->m_canvas->SetCurrent();
	277	read_surface( "isosurf.dat" );
	278
	279	Init();
	280
	281	return TRUE;
	282	}
	283
	284	BEGIN_EVENT_TABLE(MyFrame, wxFrame)
	285	EVT_MENU(wxID_EXIT, MyFrame::OnExit)
	286	END_EVENT_TABLE()
	287
	288	// My frame constructor
	289	MyFrame::MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos,
	290	const wxSize& size, long style):
	291	wxFrame(frame, -1, title, pos, size, style)
	292	{
	293	m_canvas = NULL;
	294	}
	295
	296	// Intercept menu commands
	297	void MyFrame::OnExit(wxCommandEvent& event)
	298	{
	299	Destroy();
	300	}
	301
	302	/*
	303	* TestGLCanvas implementation
	304	*/
	305
	306	BEGIN_EVENT_TABLE(TestGLCanvas, wxGLCanvas)
	307	EVT_SIZE(TestGLCanvas::OnSize)
	308	EVT_PAINT(TestGLCanvas::OnPaint)
	309	EVT_CHAR(TestGLCanvas::OnChar)
	310	EVT_MOUSE_EVENTS(TestGLCanvas::OnMouseEvent)
	311	EVT_ERASE_BACKGROUND(TestGLCanvas::OnEraseBackground)
	312	END_EVENT_TABLE()
	313
	314	TestGLCanvas::TestGLCanvas(wxWindow *parent, wxWindowID id,
	315	const wxPoint& pos, const wxSize& size, long style, const wxString& name, int* gl_attrib):
	316	wxGLCanvas(parent, id, pos, size, style, name, gl_attrib)
	317	{
	318	parent->Show(TRUE);
	319	SetCurrent();
919ae91a	320
8b089c5e JS	321	/* Make sure server supports the vertex array extension */
	322	char* extensions = (char *) glGetString( GL_EXTENSIONS );
	323	if (!extensions \|\| !strstr( extensions, "GL_EXT_vertex_array" )) {
	324	use_vertex_arrays = GL_FALSE;
	325	}
	326	}
	327
	328
	329	TestGLCanvas::~TestGLCanvas(void)
	330	{
	331	}
	332
	333	void TestGLCanvas::OnPaint( wxPaintEvent& event )
	334	{
	335	// This is a dummy, to avoid an endless succession of paint messages.
	336	// OnPaint handlers must always create a wxPaintDC.
	337	wxPaintDC dc(this);
	338
c661ecca RR	339	#ifndef __WXMOTIF__
	340	if (!GetContext()) return;
	341	#endif
	342
919ae91a UN	343	SetCurrent();
919ae91a UN	344
8b089c5e JS	345	draw1();
	346	SwapBuffers();
	347	}
	348
	349	void TestGLCanvas::OnSize(wxSizeEvent& event)
	350	{
c661ecca RR	351	#ifndef __WXMOTIF__
	352	if (!GetContext()) return;
	353	#endif
	354
8b089c5e JS	355	SetCurrent();
	356	int width, height;
	357	GetClientSize(& width, & height);
	358	Reshape(width, height);
	359	}
	360
	361	void TestGLCanvas::OnChar(wxKeyEvent& event)
	362	{
	363	switch(event.KeyCode()) {
	364	case WXK_ESCAPE:
	365	exit(0);
	366	case WXK_LEFT:
	367	yrot -= 15.0;
	368	break;
	369	case WXK_RIGHT:
	370	yrot += 15.0;
	371	break;
	372	case WXK_UP:
	373	xrot += 15.0;
	374	break;
	375	case WXK_DOWN:
	376	xrot -= 15.0;
	377	break;
	378	case 's': case 'S':
	379	smooth = !smooth;
	380	if (smooth) {
	381	glShadeModel(GL_SMOOTH);
	382	} else {
	383	glShadeModel(GL_FLAT);
	384	}
	385	break;
	386	case 'l': case 'L':
	387	lighting = !lighting;
	388	if (lighting) {
	389	glEnable(GL_LIGHTING);
	390	} else {
	391	glDisable(GL_LIGHTING);
	392	}
	393	break;
	394	default:
	395	{
	396	event.Skip();
	397	return;
	398	}
	399	}
	400
	401	Refresh(FALSE);
	402	}
	403
	404	void TestGLCanvas::OnMouseEvent(wxMouseEvent& event)
	405	{
	406	static int dragging = 0;
	407	static float last_x, last_y;
	408
	409	//printf("%f %f %d\n", event.GetX(), event.GetY(), (int)event.LeftIsDown());
	410	if(event.LeftIsDown()) {
	411	if(!dragging) {
	412	dragging = 1;
	413	} else {
	414	yrot += (event.GetX() - last_x)*1.0;
	415	xrot += (event.GetY() - last_y)*1.0;
	416	Refresh(FALSE);
	417	}
	418	last_x = event.GetX();
419	last_y = event.GetY();
420	} else
421	dragging = 0;
422	}
423
424	void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)
425	{
426	// Do nothing, to avoid flashing.
427	}
428