1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
|
/****************************************************************************
**
** 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 demonstrating the use of TQImages for textures.
**
** Much of the GL code is inspired by the 'spectex' and 'texcyl'
** public domain demo programs by Brian Paul.
**
****************************************************************************/
#include "gltexobj.h"
#include <ntqimage.h>
#include <ntqtimer.h>
const int redrawWait = 50;
/*!
Create a GLTexobj widget
*/
GLTexobj::GLTexobj( TQWidget* parent, const char* name )
: TQGLWidget( parent, name )
{
xRot = yRot = zRot = 0.0; // default object rotation
scale = 5.0; // default object scale
object = 0;
animation = TRUE;
timer = new TQTimer( this );
connect( timer, TQ_SIGNAL(timeout()), TQ_SLOT(update()) );
timer->start( redrawWait, TRUE );
}
/*!
Release allocated resources
*/
GLTexobj::~GLTexobj()
{
makeCurrent();
glDeleteLists( object, 1 );
}
/*!
Paint the texobj. The actual openGL commands for drawing the texobj are
performed here.
*/
void GLTexobj::paintGL()
{
if ( animation ) {
xRot += 1.0;
yRot += 2.5;
zRot -= 5.0;
}
glClear( GL_COLOR_BUFFER_BIT );
glPushMatrix();
glRotatef( xRot, 1.0, 0.0, 0.0 );
glRotatef( yRot, 0.0, 1.0, 0.0 );
glRotatef( zRot, 0.0, 0.0, 1.0 );
glScalef( scale, scale, scale );
glCallList( object );
glPopMatrix();
if ( animation ) {
glFlush(); // Make sure everything is drawn before restarting timer
timer->start( redrawWait, TRUE ); // Wait this many msecs before redraw
}
}
/*!
Set up the OpenGL rendering state, and define display list
*/
void GLTexobj::initializeGL()
{
// Set up the lights
GLfloat whiteDir[4] = {2.0, 2.0, 2.0, 1.0};
GLfloat whiteAmb[4] = {1.0, 1.0, 1.0, 1.0};
GLfloat lightPos[4] = {30.0, 30.0, 30.0, 1.0};
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_FALSE);
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, whiteAmb);
glMaterialfv(GL_FRONT, GL_DIFFUSE, whiteDir);
glMaterialfv(GL_FRONT, GL_SPECULAR, whiteDir);
glMaterialf(GL_FRONT, GL_SHININESS, 20.0);
glLightfv(GL_LIGHT0, GL_DIFFUSE, whiteDir); // enable diffuse
glLightfv(GL_LIGHT0, GL_SPECULAR, whiteDir); // enable specular
glLightfv(GL_LIGHT0, GL_POSITION, lightPos);
// Set up the textures
TQImage tex1, tex2, buf;
if ( !buf.load( "gllogo.bmp" ) ) { // Load first image from file
tqWarning( "Could not read image file, using single-color instead." );
TQImage dummy( 128, 128, 32 );
dummy.fill( TQt::green.rgb() );
buf = dummy;
}
tex1 = TQGLWidget::convertToGLFormat( buf ); // flipped 32bit RGBA
if ( !buf.load( "qtlogo.bmp" ) ) { // Load first image from file
tqWarning( "Could not read image file, using single-color instead." );
TQImage dummy( 128, 128, 32 );
dummy.fill( TQt::red.rgb() );
buf = dummy;
}
tex2 = TQGLWidget::convertToGLFormat( buf ); // flipped 32bit RGBA
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glEnable( GL_TEXTURE_2D );
// Set up various other stuff
glClearColor( 0.0, 0.0, 0.0, 0.0 ); // Let OpenGL clear to black
glEnable( GL_CULL_FACE ); // don't need Z testing for convex objects
glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
// Make the object display list
object = makeObject( tex1, tex2 ); // Generate an OpenGL display list
}
/*!
Set up the OpenGL view port, matrix mode, etc.
*/
void GLTexobj::resizeGL( int w, int h )
{
glViewport( 0, 0, w, h );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
glFrustum( -1.0, 1.0, -1.0, 1.0, 10.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
glTranslatef( 0.0, 0.0, -70.0 );
}
/*!
Generate an OpenGL display list for the object to be shown, i.e. the texobj
*/
GLuint GLTexobj::makeObject( const TQImage& tex1, const TQImage& tex2 )
{
GLUquadricObj* q = gluNewQuadric();
GLuint cylinderObj = glGenLists(1);
glNewList( cylinderObj, GL_COMPILE );
glTranslatef( 0.0, 0.0, -1.0 );
// cylinder
glTexImage2D( GL_TEXTURE_2D, 0, 3, tex1.width(), tex1.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, tex1.bits() );
gluQuadricTexture( q, GL_TRUE );
gluCylinder(q, 0.6, 0.6, 2.0, 24, 1);
// end cap
glTexImage2D( GL_TEXTURE_2D, 0, 3, tex2.width(), tex2.height(), 0,
GL_RGBA, GL_UNSIGNED_BYTE, tex2.bits() );
glTranslatef( 0.0, 0.0, 2.0 );
gluDisk( q, 0.0, 0.6, 24, 1 );
// other end cap
glTranslatef( 0.0, 0.0, -2.0 );
gluQuadricOrientation( q, (GLenum)GLU_INSIDE );
gluDisk( q, 0.0, 0.6, 24, 1 );
glEndList();
gluDeleteQuadric( q );
return cylinderObj;
}
/*!
Set the rotation angle of the object to \e degrees around the X axis.
*/
void GLTexobj::setXRotation( int degrees )
{
xRot = (GLfloat)(degrees % 360);
updateGL();
}
/*!
Set the rotation angle of the object to \e degrees around the Y axis.
*/
void GLTexobj::setYRotation( int degrees )
{
yRot = (GLfloat)(degrees % 360);
updateGL();
}
/*!
Set the rotation angle of the object to \e degrees around the Z axis.
*/
void GLTexobj::setZRotation( int degrees )
{
zRot = (GLfloat)(degrees % 360);
updateGL();
}
/*!
Turns animation on or off
*/
void GLTexobj::toggleAnimation()
{
animation = !animation;
if ( animation )
updateGL();
else
timer->stop();
}
|
