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
|
#include <qlibrary.h>
#include <qapplication.h>
#include <qfile.h>
#include <GL/gl.h>
#include "myqgl.h"
#include "ksquirrel-libs/fmt_utils.h"
#include "ksquirrel-libs/error.h"
MyQGL::MyQGL(QWidget *parent, const char *name) : QGLWidget(parent, name), bits(0), w(0), h(0)
{}
MyQGL::~MyQGL()
{}
void MyQGL::initializeGL()
{
qglClearColor(white);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glShadeModel(GL_FLAT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glMatrixMode(GL_MODELVIEW);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
}
void MyQGL::resizeGL(int width, int height)
{
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-width/2, width/2, -height/2, height/2, 0.1f, 100.0f);
gluLookAt(0,0,1, 0,0,0, 0,1,0);
glMatrixMode(GL_MODELVIEW);
}
void MyQGL::paintGL()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D, tex);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex2f(-w/2, h/2);
glTexCoord2f(1.0f, 0.0f); glVertex2f(w/2, h/2);
glTexCoord2f(1.0f, 1.0f); glVertex2f(w/2, -h/2);
glTexCoord2f(0.0f, 1.0f); glVertex2f(-w/2, -h/2);
glEnd();
glDisable(GL_TEXTURE_2D);
}
void MyQGL::loadImage()
{
// try to load BMP library
QLibrary lib("/usr/lib/ksquirrel-libs/libkls_bmp.so");
lib.load();
// no such library
if(!lib.isLoaded())
{
tqWarning("Can't load BMP library.");
tqApp->quit();
}
int i = 0;
fmt_info finfo;
RGBA *image;
int current = 0;
// resolve neccessary functions
codec_create = (fmt_codec_base*(*)())lib.resolve("codec_create");
codec_destroy = (void (*)(fmt_codec_base*))lib.resolve("codec_destroy");
// library corrupted!
if(!codec_create || !codec_destroy)
{
tqWarning("Library corrupted.");
lib.unload();
tqApp->quit();
}
const char *s = "../w3.bmp";
// if the image doesn't exist
if(!QFile::exists(s))
{
tqWarning("Can't find example image.");
lib.unload();
tqApp->quit();
}
// OK, create decoder
codeK = codec_create();
// init library
i = codeK->read_init(s);
if(i != SQE_OK)
{
codeK->read_close();
return;
}
// move to the next image
i = codeK->read_next();
// save retrieved information
finfo = codeK->information();
if(i != SQE_OK)
{
codeK->read_close();
return;
}
image = (RGBA*)calloc(finfo.image[current].w * finfo.image[current].h, sizeof(RGBA));
if(!image)
{
codeK->read_close();
return;
}
memset(image, 255, finfo.image[current].w * finfo.image[current].h * sizeof(RGBA));
RGBA *scan;
// OK, let's decode the image line-by-line, pass-by-pass
for(int pass = 0;pass < finfo.image[current].passes;pass++)
{
codeK->read_next_pass();
for(int j = 0;j < finfo.image[current].h;j++)
{
scan = image + j * finfo.image[current].w;
codeK->read_scanline(scan);
}
}
// flip, if neccessary (BMP requires flipping)
if(finfo.image[current].needflip)
fmt_utils::flipv((char*)image, finfo.image[current].w * sizeof(RGBA), finfo.image[current].h);
// close library
codeK->read_close();
w = finfo.image[current].w;
h = finfo.image[current].h;
bits = image;
}
void MyQGL::bind()
{
loadImage();
if(!bits)
return;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
// remember, that texture dimensions should be a power of two, e.g.
// 32, 64, 256, ...
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, bits);
updateGL();
}
|
