e2rcore/implement/render/
texture_collection.rs

1use std::collections::HashMap;
2use std::string::String;
3
4
5use implement::render::router;
6
7pub struct TextureCollection {
8    _textures: HashMap< u64, ( router::ShaderType, i64 ) >,
9    _id_to_descrip: HashMap< u64, String >,
10    _descrip_to_id: HashMap< String, u64 >,
11    _id_generator: u64,
12}
13
14
15impl Default for TextureCollection {
16    fn default() -> TextureCollection {
17        TextureCollection {
18            _textures: HashMap::new(),
19            _id_to_descrip: HashMap::new(),
20            _descrip_to_id: HashMap::new(),
21            _id_generator: 0u64,
22        }
23    }
24}
25
26impl Drop for TextureCollection {
27    fn drop( & mut self ) {
28        self._textures.clear();
29    }
30}
31
32impl TextureCollection {
33    pub fn add( & mut self, shader_type: router::ShaderType, internal_handle: i64, descrip: String ) -> Result< (u64), & 'static str > {
34        let mut handle = self._id_generator;
35        while self._textures.contains_key( &handle ) {
36            handle = handle + 1;
37        }
38        match self._textures.insert( handle, ( shader_type, internal_handle ) ) {
39            None => (),
40            Some( ( _shader_type, _old_handle ) ) => {
41                return Err( &"adding texture handle failed")
42            }
43        }
44        self._id_generator = handle;
45        self._id_to_descrip.insert( handle, descrip.clone() );
46        self._descrip_to_id.insert( descrip, handle );
47        Ok( handle )
48    }
49    pub fn put( & mut self, id: u64, shader_type: router::ShaderType, internal_handle: i64, descrip: String ) -> Result< (), & 'static str > {
50        match self._textures.insert( id, ( shader_type, internal_handle ) ) {
51            None => (),
52            Some( ( shader_type, old_handle ) ) => {
53                router::delete_texture( old_handle, shader_type )?;
54                trace!( "removed old texture( {} ).", old_handle );
55            }
56        }
57        self._id_to_descrip.insert( id, descrip.clone() );
58        self._descrip_to_id.insert( descrip, id );
59        Ok( () )
60    }
61    pub fn clear( & mut self ) -> Result< (), & 'static str > {
62        for ( &_k, &( ref shader_type, ref handle ) ) in self._textures.iter() {
63            router::delete_texture( *handle, (*shader_type).clone() )?
64        }
65        self._id_to_descrip.clear();
66        self._descrip_to_id.clear();
67        Ok( () )
68    }
69    pub fn remove( & mut self, id: u64 ) -> Result< (), & 'static str > {
70        match self._textures.remove( &id ) {
71            Some( ( shader_type, handle ) ) => {
72                router::delete_texture( handle, shader_type )?;
73                if let Some( descrip ) = self._id_to_descrip.remove( &id ) {
74                    self._descrip_to_id.remove( &descrip );
75                }
76            },
77            None => (),
78        }
79        Ok( () )
80    }
81    pub fn get( & mut self, id: u64 ) -> Option< i64 > {
82        match self._textures.get( &id ) {
83            Some( &( ref _shader_type, ref handle ) ) => {
84                return Some( *handle )
85            },
86            None => return None
87        }
88    }
89}
e2rcore/implement/render/texture_collection.rs

e2rcore/implement/render/
texture_collection.rs
