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OpenGl works now under GTK

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1360 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
1999-01-10 10:49:57 +00:00
parent 71432ef81f
commit aae24d21a3
24 changed files with 1534 additions and 225 deletions
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16
utils/glcanvas/samples/cube/Makefile Normal file
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@@ -0,0 +1,16 @@
CC = g++
cube: cube.o glcanvas.o
$(CC) -o cube \
cube.o glcanvas.o \
`wx-config --libs` -lMesaGL -lMesaGLU
cube.o: cube.cpp
$(CC) `wx-config --cflags` -I../../src -c cube.cpp
glcanvas.o: ../../src/glcanvas.cpp
$(CC) `wx-config --cflags` `gtk-config --cflags` -I../../src -c ../../src/glcanvas.cpp
clean:
rm -f *.o cube

11
utils/glcanvas/samples/cube/cube.cpp
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@@ -29,8 +29,6 @@
#include "cube.h"
IMPLEMENT_APP(MyApp)
// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit(void)
{
@@ -54,7 +52,7 @@ bool MyApp::OnInit(void)
frame->m_canvas = new TestGLCanvas(frame, -1, wxPoint(0, 0), wxSize(200, 200));
InitGL();
// InitGL();
// Show the frame
frame->Show(TRUE);
@@ -81,6 +79,8 @@ void MyApp::InitGL(void)
glEnable(GL_LIGHT0);
}
IMPLEMENT_APP(MyApp)
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(wxID_EXIT, MyFrame::OnExit)
END_EVENT_TABLE()
@@ -169,8 +169,11 @@ void TestGLCanvas::OnSize(wxSizeEvent& event)
int width, height;
GetClientSize(& width, & height);
if ( GetContext() )
if (GetContext())
{
SetCurrent();
glViewport(0, 0, width, height);
}
}
void TestGLCanvas::OnEraseBackground(wxEraseEvent& event)

16
utils/glcanvas/samples/isosurf/Makefile Normal file
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@@ -0,0 +1,16 @@
CC = g++
isosurf: isosurf.o glcanvas.o
$(CC) -o isosurf \
isosurf.o glcanvas.o \
`wx-config --libs` -lMesaGL -lMesaGLU
isosurf.o: isosurf.cpp
$(CC) `wx-config --cflags` -I../../src -c isosurf.cpp
glcanvas.o: ../../src/glcanvas.cpp
$(CC) `wx-config --cflags` `gtk-config --cflags` -I../../src -c ../../src/glcanvas.cpp
clean:
rm -f *.o cube

23
utils/glcanvas/samples/penguin/Makefile Normal file
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@@ -0,0 +1,23 @@
CPP = g++
CC = gcc
Penguin: penguin.o trackball.o lw.o glcanvas.o
$(CPP) -o Penguin \
penguin.o trackball.o lw.o glcanvas.o \
`wx-config --libs` -lMesaGL -lMesaGLU
penguin.o: penguin.cpp
$(CPP) `wx-config --cflags` -I../../src -c penguin.cpp
lw.o: lw.c
$(CC) `wx-config --cflags` -I../../src -c lw.c
trackball.o: trackball.c
$(CC) `wx-config --cflags` -I../../src -c trackball.c
glcanvas.o: ../../src/glcanvas.cpp
$(CPP) `wx-config --cflags` `gtk-config --cflags` -I../../src -c ../../src/glcanvas.cpp
clean:
rm -f *.o penguin

426
utils/glcanvas/samples/penguin/lw.c Normal file
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@@ -0,0 +1,426 @@
/*
* Copyright (C) 1998 Janne L<>f <jlof@mail.student.oulu.fi>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "lw.h"
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#define wxInt32 int
#define wxUint32 unsigned int
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE 1
#endif
#define MK_ID(a,b,c,d) ((((wxUint32)(a))<<24)| \
(((wxUint32)(b))<<16)| \
(((wxUint32)(c))<< 8)| \
(((wxUint32)(d)) ))
#define ID_FORM MK_ID('F','O','R','M')
#define ID_LWOB MK_ID('L','W','O','B')
#define ID_PNTS MK_ID('P','N','T','S')
#define ID_SRFS MK_ID('S','R','F','S')
#define ID_SURF MK_ID('S','U','R','F')
#define ID_POLS MK_ID('P','O','L','S')
#define ID_COLR MK_ID('C','O','L','R')
static wxInt32 read_char(FILE *f)
{
int c = fgetc(f);
return c;
}
static wxInt32 read_short(FILE *f)
{
return (read_char(f)<<8) | read_char(f);
}
static wxInt32 read_long(FILE *f)
{
return (read_char(f)<<24) | (read_char(f)<<16) | (read_char(f)<<8) | read_char(f);
}
static GLfloat read_float(FILE *f)
{
wxInt32 x = read_long(f);
return *(GLfloat*)&x;
}
static int read_string(FILE *f, char *s)
{
int c;
int cnt = 0;
do {
c = read_char(f);
if (cnt < LW_MAX_NAME_LEN)
s[cnt] = c;
else
s[LW_MAX_NAME_LEN-1] = 0;
cnt++;
} while (c != 0);
/* if length of string (including \0) is odd skip another byte */
if (cnt%2) {
read_char(f);
cnt++;
}
return cnt;
}
static void read_srfs(FILE *f, int nbytes, lwObject *lwo)
{
int guess_cnt = lwo->material_cnt;
while (nbytes > 0) {
lwMaterial *material;
/* allocate more memory for materials if needed */
if (guess_cnt <= lwo->material_cnt) {
guess_cnt += guess_cnt/2 + 4;
lwo->material = realloc(lwo->material, sizeof(lwMaterial)*guess_cnt);
}
material = lwo->material + lwo->material_cnt++;
/* read name */
nbytes -= read_string(f,material->name);
/* defaults */
material->r = 0.7;
material->g = 0.7;
material->b = 0.7;
}
lwo->material = realloc(lwo->material, sizeof(lwMaterial)*lwo->material_cnt);
}
static void read_surf(FILE *f, int nbytes, lwObject *lwo)
{
int i;
char name[LW_MAX_NAME_LEN];
lwMaterial *material = NULL;
/* read surface name */
nbytes -= read_string(f,name);
/* find material */
for (i=0; i< lwo->material_cnt; i++) {
if (strcmp(lwo->material[i].name,name) == 0) {
material = &lwo->material[i];
break;
}
}
/* read values */
while (nbytes > 0) {
int id = read_long(f);
int len = read_short(f);
nbytes -= 6 + len + (len%2);
switch (id) {
case ID_COLR:
material->r = read_char(f) / 255.0;
material->g = read_char(f) / 255.0;
material->b = read_char(f) / 255.0;
read_char(f); /* dummy */
break;
default:
fseek(f, len+(len%2), SEEK_CUR);
}
}
}
static void read_pols(FILE *f, int nbytes, lwObject *lwo)
{
int guess_cnt = lwo->face_cnt;
while (nbytes > 0) {
lwFace *face;
int i;
/* allocate more memory for polygons if necessary */
if (guess_cnt <= lwo->face_cnt) {
guess_cnt += guess_cnt + 4;
lwo->face = realloc(lwo->face, sizeof(lwFace)*guess_cnt);
}
face = lwo->face + lwo->face_cnt++;
/* number of points in this face */
face->index_cnt = read_short(f);
nbytes -= 2;
/* allocate space for points */
face->index = calloc(sizeof(int)*face->index_cnt,1);
/* read points in */
for (i=0; i<face->index_cnt; i++) {
face->index[i] = read_short(f);
nbytes -= 2;
}
/* read surface material */
face->material = read_short(f);
nbytes -= 2;
/* skip over detail polygons */
if (face->material < 0) {
int det_cnt;
face->material = -face->material;
det_cnt = read_short(f);
nbytes -= 2;
while (det_cnt-- > 0) {
int cnt = read_short(f);
fseek(f, cnt*2+2, SEEK_CUR);
nbytes -= cnt*2+2;
}
}
face->material -= 1;
}
/* readjust to true size */
lwo->face = realloc(lwo->face, sizeof(lwFace)*lwo->face_cnt);
}
static void read_pnts(FILE *f, int nbytes, lwObject *lwo)
{
int i;
lwo->vertex_cnt = nbytes / 12;
lwo->vertex = calloc(sizeof(GLfloat)*lwo->vertex_cnt*3, 1);
for (i=0; i<lwo->vertex_cnt; i++) {
lwo->vertex[i*3+0] = read_float(f);
lwo->vertex[i*3+1] = read_float(f);
lwo->vertex[i*3+2] = read_float(f);
}
}
int lw_is_lwobject(const char *lw_file)
{
FILE *f = fopen(lw_file, "rb");
if (f) {
wxInt32 form = read_long(f);
wxInt32 nlen = read_long(f);
wxInt32 lwob = read_long(f);
fclose(f);
if (form == ID_FORM && nlen != 0 && lwob == ID_LWOB)
return TRUE;
}
return FALSE;
}
lwObject *lw_object_read(const char *lw_file)
{
FILE *f = NULL;
lwObject *lw_object = NULL;
wxInt32 form_bytes = 0;
wxInt32 read_bytes = 0;
/* open file */
f = fopen(lw_file, "rb");
if (f == NULL) {
return NULL;
}
/* check for headers */
if (read_long(f) != ID_FORM) {
fclose(f);
return NULL;
}
form_bytes = read_long(f);
read_bytes += 4;
if (read_long(f) != ID_LWOB) {
fclose(f);
return NULL;
}
/* create new lwObject */
lw_object = calloc(sizeof(lwObject),1);
/* read chunks */
while (read_bytes < form_bytes) {
wxInt32 id = read_long(f);
wxInt32 nbytes = read_long(f);
read_bytes += 8 + nbytes + (nbytes%2);
switch (id) {
case ID_PNTS:
read_pnts(f, nbytes, lw_object);
break;
case ID_POLS:
read_pols(f, nbytes, lw_object);
break;
case ID_SRFS:
read_srfs(f, nbytes, lw_object);
break;
case ID_SURF:
read_surf(f, nbytes, lw_object);
break;
default:
fseek(f, nbytes + (nbytes%2), SEEK_CUR);
}
}
fclose(f);
return lw_object;
}
void lw_object_free(lwObject *lw_object)
{
if (lw_object->face) {
int i;
for (i=0; i<lw_object->face_cnt; i++)
free(lw_object->face[i].index);
free(lw_object->face);
}
free(lw_object->material);
free(lw_object->vertex);
free(lw_object);
}
#define PX(i) (lw_object->vertex[face->index[i]*3+0])
#define PY(i) (lw_object->vertex[face->index[i]*3+1])
#define PZ(i) (lw_object->vertex[face->index[i]*3+2])
void lw_object_show(const lwObject *lw_object)
{
int i,j;
int prev_index_cnt = -1;
int prev_material = -1;
GLfloat prev_nx = 0;
GLfloat prev_ny = 0;
GLfloat prev_nz = 0;
for (i=0; i<lw_object->face_cnt; i++) {
GLfloat ax,ay,az,bx,by,bz,nx,ny,nz,r;
const lwFace *face = lw_object->face+i;
/* ignore faces with less than 3 points */
if (face->index_cnt < 3)
continue;
/* calculate normal */
ax = PX(1) - PX(0);
ay = PY(1) - PY(0);
az = PZ(1) - PZ(0);
bx = PX(face->index_cnt-1) - PX(0);
by = PY(face->index_cnt-1) - PY(0);
bz = PZ(face->index_cnt-1) - PZ(0);
nx = ay * bz - az * by;
ny = az * bx - ax * bz;
nz = ax * by - ay * bx;
r = sqrt(nx*nx + ny*ny + nz*nz);
if (r < 0.000001) /* avoid division by zero */
continue;
nx /= r;
ny /= r;
nz /= r;
/* glBegin/glEnd */
if (prev_index_cnt != face->index_cnt || prev_index_cnt > 4) {
if (prev_index_cnt > 0) glEnd();
prev_index_cnt = face->index_cnt;
switch (face->index_cnt) {
case 3:
glBegin(GL_TRIANGLES);
break;
case 4:
glBegin(GL_QUADS);
break;
default:
glBegin(GL_POLYGON);
}
}
/* update material if necessary */
if (prev_material != face->material) {
prev_material = face->material;
glColor3f(lw_object->material[face->material].r,
lw_object->material[face->material].g,
lw_object->material[face->material].b);
}
/* update normal if necessary */
if (nx != prev_nx || ny != prev_ny || nz != prev_nz) {
prev_nx = nx;
prev_ny = ny;
prev_nz = nz;
glNormal3f(nx,ny,nz);
}
/* draw polygon/triangle/quad */
for (j=0; j<face->index_cnt; j++)
glVertex3f(PX(j),PY(j),PZ(j));
}
/* if glBegin was called call glEnd */
if (prev_index_cnt > 0)
glEnd();
}
GLfloat lw_object_radius(const lwObject *lwo)
{
int i;
double max_radius = 0.0;
for (i=0; i<lwo->vertex_cnt; i++) {
GLfloat *v = &lwo->vertex[i*3];
double r = v[0]*v[0] + v[1]*v[1] + v[2]*v[2];
if (r > max_radius)
max_radius = r;
}
return sqrt(max_radius);
}
void lw_object_scale(lwObject *lwo, GLfloat scale)
{
int i;
for (i=0; i<lwo->vertex_cnt; i++) {
lwo->vertex[i*3+0] *= scale;
lwo->vertex[i*3+1] *= scale;
lwo->vertex[i*3+2] *= scale;
}
}

62
utils/glcanvas/samples/penguin/lw.h Normal file
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@@ -0,0 +1,62 @@
/*
* Copyright (C) 1998 Janne L<>f <jlof@mail.student.oulu.fi>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef LW_H
#define LW_H
#include <GL/gl.h>
#define LW_MAX_POINTS 200
#define LW_MAX_NAME_LEN 500
typedef struct {
char name[LW_MAX_NAME_LEN];
GLfloat r,g,b;
} lwMaterial;
typedef struct {
int material; /* material of this face */
int index_cnt; /* number of vertices */
int *index; /* index to vertex */
float *texcoord; /* u,v texture coordinates */
} lwFace;
typedef struct {
int face_cnt;
lwFace *face;
int material_cnt;
lwMaterial *material;
int vertex_cnt;
GLfloat *vertex;
} lwObject;
int lw_is_lwobject(const char *lw_file);
lwObject *lw_object_read(const char *lw_file);
void lw_object_free( lwObject *lw_object);
void lw_object_show(const lwObject *lw_object);
GLfloat lw_object_radius(const lwObject *lw_object);
void lw_object_scale (lwObject *lw_object, GLfloat scale);
#endif /* LW_H */

236
utils/glcanvas/samples/penguin/penguin.cpp Normal file
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@@ -0,0 +1,236 @@
/////////////////////////////////////////////////////////////////////////////
// Name: penguin.cpp
// Purpose: wxGLCanvas demo program
// Author: Robert Roebling
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id$
// 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
#include "penguin.h"
#include <GL/glu.h>
#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));
/* 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();
}
bool MyFrame::OnClose(void)
{
return TRUE;
}
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);
if (!GetContext()) return;
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)
{
int width, height;
GetClientSize(& width, & height);
if (GetContext())
{
SetCurrent();
glViewport(0, 0, width, height);
}
}
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 )
{
if (event.Dragging())
{
/* drag in progress, simulate trackball */
float spin_quat[4];
trackball(spin_quat,
(2.0*info.beginx - m_width) / m_width,
( m_height - 2.0*info.beginy) / m_height,
( 2.0*event.GetX() - m_width) / m_width,
( m_height - 2.0*event.GetY()) / m_height);
add_quats( spin_quat, info.quat, info.quat );
/* orientation has changed, redraw mesh */
Refresh();
}
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);
}

84
utils/glcanvas/samples/penguin/penguin.h Normal file
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@@ -0,0 +1,84 @@
/////////////////////////////////////////////////////////////////////////////
// Name: penguin.h
// Purpose: wxGLCanvas demo program
// Author: Robert Roebling
// Modified by:
// Created: 04/01/98
// RCS-ID: $Id$
// Copyright: (c) Robert Roebling
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
#ifndef _WX_PENGUIN_H_
#define _WX_PENGUIN_H_
#include "wx/defs.h"
#include "wx/app.h"
#include "wx/menu.h"
#include "wx/dcclient.h"
#include "glcanvas.h"
extern "C" {
#include "lw.h"
#include "trackball.h"
}
/* information needed to display lightwave mesh */
typedef struct
{
gint do_init; /* true if initgl not yet called */
lwObject *lwobject; /* lightwave object mesh */
float beginx,beginy; /* position of mouse */
float quat[4]; /* orientation of object */
float zoom; /* field of view in degrees */
} mesh_info;
/* Define a new application type */
class MyApp: public wxApp
{
public:
bool OnInit(void);
};
/* Define a new frame type */
class TestGLCanvas;
class MyFrame: public wxFrame
{
public:
MyFrame(wxFrame *frame, const wxString& title, const wxPoint& pos, const wxSize& size,
long style = wxDEFAULT_FRAME_STYLE);
void OnExit(wxCommandEvent& event);
bool OnClose(void);
public:
TestGLCanvas* m_canvas;
DECLARE_EVENT_TABLE()
};
class TestGLCanvas: public wxGLCanvas
{
public:
TestGLCanvas(wxWindow *parent, const wxWindowID id = -1, const wxPoint& pos = wxDefaultPosition,
const wxSize& size = wxDefaultSize, long style = 0, const wxString& name = "TestGLCanvas");
~TestGLCanvas(void);
void OnPaint(wxPaintEvent& event);
void OnSize(wxSizeEvent& event);
void OnEraseBackground(wxEraseEvent& event);
void LoadLWO( const wxString &filename);
void OnMouse( wxMouseEvent& event );
void InitGL(void);
mesh_info info;
bool block;
DECLARE_EVENT_TABLE()
};
#endif

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utils/glcanvas/samples/penguin/trackball.c Normal file
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/*
* (c) Copyright 1993, 1994, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
/*
* Trackball code:
*
* Implementation of a virtual trackball.
* Implemented by Gavin Bell, lots of ideas from Thant Tessman and
* the August '88 issue of Siggraph's "Computer Graphics," pp. 121-129.
*
* Vector manip code:
*
* Original code from:
* David M. Ciemiewicz, Mark Grossman, Henry Moreton, and Paul Haeberli
*
* Much mucking with by:
* Gavin Bell
*/
#include <math.h>
#include "trackball.h"
/*
* This size should really be based on the distance from the center of
* rotation to the point on the object underneath the mouse. That
* point would then track the mouse as closely as possible. This is a
* simple example, though, so that is left as an Exercise for the
* Programmer.
*/
#define TRACKBALLSIZE (0.8)
/*
* Local function prototypes (not defined in trackball.h)
*/
static float tb_project_to_sphere(float, float, float);
static void normalize_quat(float [4]);
void
vzero(float *v)
{
v[0] = 0.0;
v[1] = 0.0;
v[2] = 0.0;
}
void
vset(float *v, float x, float y, float z)
{
v[0] = x;
v[1] = y;
v[2] = z;
}
void
vsub(const float *src1, const float *src2, float *dst)
{
dst[0] = src1[0] - src2[0];
dst[1] = src1[1] - src2[1];
dst[2] = src1[2] - src2[2];
}
void
vcopy(const float *v1, float *v2)
{
register int i;
for (i = 0 ; i < 3 ; i++)
v2[i] = v1[i];
}
void
vcross(const float *v1, const float *v2, float *cross)
{
float temp[3];
temp[0] = (v1[1] * v2[2]) - (v1[2] * v2[1]);
temp[1] = (v1[2] * v2[0]) - (v1[0] * v2[2]);
temp[2] = (v1[0] * v2[1]) - (v1[1] * v2[0]);
vcopy(temp, cross);
}
float
vlength(const float *v)
{
return sqrt(v[0] * v[0] + v[1] * v[1] + v[2] * v[2]);
}
void
vscale(float *v, float div)
{
v[0] *= div;
v[1] *= div;
v[2] *= div;
}
void
vnormal(float *v)
{
vscale(v,1.0/vlength(v));
}
float
vdot(const float *v1, const float *v2)
{
return v1[0]*v2[0] + v1[1]*v2[1] + v1[2]*v2[2];
}
void
vadd(const float *src1, const float *src2, float *dst)
{
dst[0] = src1[0] + src2[0];
dst[1] = src1[1] + src2[1];
dst[2] = src1[2] + src2[2];
}
/*
* Ok, simulate a track-ball. Project the points onto the virtual
* trackball, then figure out the axis of rotation, which is the cross
* product of P1 P2 and O P1 (O is the center of the ball, 0,0,0)
* Note: This is a deformed trackball-- is a trackball in the center,
* but is deformed into a hyperbolic sheet of rotation away from the
* center. This particular function was chosen after trying out
* several variations.
*
* It is assumed that the arguments to this routine are in the range
* (-1.0 ... 1.0)
*/
void
trackball(float q[4], float p1x, float p1y, float p2x, float p2y)
{
float a[3]; /* Axis of rotation */
float phi; /* how much to rotate about axis */
float p1[3], p2[3], d[3];
float t;
if (p1x == p2x && p1y == p2y) {
/* Zero rotation */
vzero(q);
q[3] = 1.0;
return;
}
/*
* First, figure out z-coordinates for projection of P1 and P2 to
* deformed sphere
*/
vset(p1,p1x,p1y,tb_project_to_sphere(TRACKBALLSIZE,p1x,p1y));
vset(p2,p2x,p2y,tb_project_to_sphere(TRACKBALLSIZE,p2x,p2y));
/*
* Now, we want the cross product of P1 and P2
*/
vcross(p2,p1,a);
/*
* Figure out how much to rotate around that axis.
*/
vsub(p1,p2,d);
t = vlength(d) / (2.0*TRACKBALLSIZE);
/*
* Avoid problems with out-of-control values...
*/
if (t > 1.0) t = 1.0;
if (t < -1.0) t = -1.0;
phi = 2.0 * asin(t);
axis_to_quat(a,phi,q);
}
/*
* Given an axis and angle, compute quaternion.
*/
void
axis_to_quat(float a[3], float phi, float q[4])
{
vnormal(a);
vcopy(a,q);
vscale(q,sin(phi/2.0));
q[3] = cos(phi/2.0);
}
/*
* Project an x,y pair onto a sphere of radius r OR a hyperbolic sheet
* if we are away from the center of the sphere.
*/
static float
tb_project_to_sphere(float r, float x, float y)
{
float d, t, z;
d = sqrt(x*x + y*y);
if (d < r * 0.70710678118654752440) { /* Inside sphere */
z = sqrt(r*r - d*d);
} else { /* On hyperbola */
t = r / 1.41421356237309504880;
z = t*t / d;
}
return z;
}
/*
* Given two rotations, e1 and e2, expressed as quaternion rotations,
* figure out the equivalent single rotation and stuff it into dest.
*
* This routine also normalizes the result every RENORMCOUNT times it is
* called, to keep error from creeping in.
*
* NOTE: This routine is written so that q1 or q2 may be the same
* as dest (or each other).
*/
#define RENORMCOUNT 97
void
add_quats(float q1[4], float q2[4], float dest[4])
{
static int count=0;
float t1[4], t2[4], t3[4];
float tf[4];
vcopy(q1,t1);
vscale(t1,q2[3]);
vcopy(q2,t2);
vscale(t2,q1[3]);
vcross(q2,q1,t3);
vadd(t1,t2,tf);
vadd(t3,tf,tf);
tf[3] = q1[3] * q2[3] - vdot(q1,q2);
dest[0] = tf[0];
dest[1] = tf[1];
dest[2] = tf[2];
dest[3] = tf[3];
if (++count > RENORMCOUNT) {
count = 0;
normalize_quat(dest);
}
}
/*
* Quaternions always obey: a^2 + b^2 + c^2 + d^2 = 1.0
* If they don't add up to 1.0, dividing by their magnitued will
* renormalize them.
*
* Note: See the following for more information on quaternions:
*
* - Shoemake, K., Animating rotation with quaternion curves, Computer
* Graphics 19, No 3 (Proc. SIGGRAPH'85), 245-254, 1985.
* - Pletinckx, D., Quaternion calculus as a basic tool in computer
* graphics, The Visual Computer 5, 2-13, 1989.
*/
static void
normalize_quat(float q[4])
{
int i;
float mag;
mag = (q[0]*q[0] + q[1]*q[1] + q[2]*q[2] + q[3]*q[3]);
for (i = 0; i < 4; i++) q[i] /= mag;
}
/*
* Build a rotation matrix, given a quaternion rotation.
*
*/
void
build_rotmatrix(float m[4][4], float q[4])
{
m[0][0] = 1.0 - 2.0 * (q[1] * q[1] + q[2] * q[2]);
m[0][1] = 2.0 * (q[0] * q[1] - q[2] * q[3]);
m[0][2] = 2.0 * (q[2] * q[0] + q[1] * q[3]);
m[0][3] = 0.0;
m[1][0] = 2.0 * (q[0] * q[1] + q[2] * q[3]);
m[1][1]= 1.0 - 2.0 * (q[2] * q[2] + q[0] * q[0]);
m[1][2] = 2.0 * (q[1] * q[2] - q[0] * q[3]);
m[1][3] = 0.0;
m[2][0] = 2.0 * (q[2] * q[0] - q[1] * q[3]);
m[2][1] = 2.0 * (q[1] * q[2] + q[0] * q[3]);
m[2][2] = 1.0 - 2.0 * (q[1] * q[1] + q[0] * q[0]);
m[2][3] = 0.0;
m[3][0] = 0.0;
m[3][1] = 0.0;
m[3][2] = 0.0;
m[3][3] = 1.0;
}

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/*
* (c) Copyright 1993, 1994, Silicon Graphics, Inc.
* ALL RIGHTS RESERVED
* Permission to use, copy, modify, and distribute this software for
* any purpose and without fee is hereby granted, provided that the above
* copyright notice appear in all copies and that both the copyright notice
* and this permission notice appear in supporting documentation, and that
* the name of Silicon Graphics, Inc. not be used in advertising
* or publicity pertaining to distribution of the software without specific,
* written prior permission.
*
* THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
* AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
* FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL SILICON
* GRAPHICS, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
* SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
* KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
* LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
* THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN
* ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
* POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
*
* US Government Users Restricted Rights
* Use, duplication, or disclosure by the Government is subject to
* restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
* (c)(1)(ii) of the Rights in Technical Data and Computer Software
* clause at DFARS 252.227-7013 and/or in similar or successor
* clauses in the FAR or the DOD or NASA FAR Supplement.
* Unpublished-- rights reserved under the copyright laws of the
* United States. Contractor/manufacturer is Silicon Graphics,
* Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311.
*
* OpenGL(TM) is a trademark of Silicon Graphics, Inc.
*/
/*
* trackball.h
* A virtual trackball implementation
* Written by Gavin Bell for Silicon Graphics, November 1988.
*/
/*
* Pass the x and y coordinates of the last and current positions of
* the mouse, scaled so they are from (-1.0 ... 1.0).
*
* The resulting rotation is returned as a quaternion rotation in the
* first paramater.
*/
void
trackball(float q[4], float p1x, float p1y, float p2x, float p2y);
/*
* Given two quaternions, add them together to get a third quaternion.
* Adding quaternions to get a compound rotation is analagous to adding
* translations to get a compound translation. When incrementally
* adding rotations, the first argument here should be the new
* rotation, the second and third the total rotation (which will be
* over-written with the resulting new total rotation).
*/
void
add_quats(float *q1, float *q2, float *dest);
/*
* A useful function, builds a rotation matrix in Matrix based on
* given quaternion.
*/
void
build_rotmatrix(float m[4][4], float q[4]);
/*
* This function computes a quaternion based on an axis (defined by
* the given vector) and an angle about which to rotate. The angle is
* expressed in radians. The result is put into the third argument.
*/
void
axis_to_quat(float a[3], float phi, float q[4]);