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
|
#define STB_IMAGE_IMPLEMENTATION
#include <stb_image.h>
#include "Texture.hpp"
#include <iostream>
namespace renderer {
Texture::Texture () : mID( 0 ) {}
Texture::~Texture () {
if( mID )
glDeleteTextures( 1, &mID );
}
bool Texture::loadFromFile ( const std::string& path, bool flip ) {
stbi_set_flip_vertically_on_load( flip );
int w, h, channels;
unsigned char* data = stbi_load( path.c_str(), &w, &h, &channels, 0 );
if( !data ) {
std::cerr << "Failed to load texture: " << path << std::endl;
return false;
}
GLenum format = GL_RGB;
if( channels == 1 )
format = GL_RED;
else if( channels == 3 )
format = GL_RGB;
else if( channels == 4 )
format = GL_RGBA;
glGenTextures( 1, &mID );
glBindTexture( GL_TEXTURE_2D, mID );
glTexImage2D( GL_TEXTURE_2D, 0, format, w, h, 0, format, GL_UNSIGNED_BYTE, data );
glGenerateMipmap( GL_TEXTURE_2D );
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_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
stbi_image_free( data );
glBindTexture( GL_TEXTURE_2D, 0 );
return true;
}
void Texture::bind ( unsigned unit ) const {
glActiveTexture( GL_TEXTURE0 + unit );
glBindTexture( GL_TEXTURE_2D, mID );
}
} // namespace renderer
|
