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
|
/*
* Modification History
*
* 2005-February-21 Jason Rohrer
* Created.
*/
#include "SingleTextureGL.h"
void SingleTextureGL::setTextureData( Image *inImage ) {
// first, convert our image to an RGBAImage
RGBAImage *rgbaImage = new RGBAImage( inImage );
if( inImage->getNumChannels() < 4 ) {
// we should fill in 1.0 for the alpha channel
// since the input image doesn't have an alpha channel
double *channel = rgbaImage->getChannel( 3 );
int numPixels = inImage->getWidth() * inImage->getHeight();
for( int i=0; i<numPixels; i++ ) {
channel[i] = 1.0;
}
}
// extract the rgba data
unsigned char *textureData = rgbaImage->getRGBABytes();
int error;
GLenum texFormat = GL_RGBA;
glBindTexture( GL_TEXTURE_2D, mTextureID );
error = glGetError();
if( error != GL_NO_ERROR ) { // error
printf( "Error binding to texture id %d, error = %d\n", mTextureID,
error );
}
glPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR );
glTexEnvf( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE );
glTexImage2D( GL_TEXTURE_2D, 0,
texFormat, inImage->getWidth(),
inImage->getHeight(), 0,
texFormat, GL_UNSIGNED_BYTE, textureData );
error = glGetError();
if( error != GL_NO_ERROR ) { // error
printf( "Error setting texture data for id %d, error = %d\n",
mTextureID, error );
printf( "Perhaps texture image width or height is not a power of 2\n"
"Width = %lu, Height = %lu\n",
inImage->getWidth(), inImage->getHeight() );
}
delete rgbaImage;
delete [] textureData;
}
|
