armos.graphics.sampler source code

1 module armos.graphics.sampler;
2 
3 import derelict.opengl3.gl;
4 
5 /++
6 +/
7 class Sampler {
8     public{
9         ///
10         this(){
11             glGenSamplers(1, cast(uint*)&_id);
12             //TODO
13             glSamplerParameteri (_id, GL_TEXTURE_WRAP_S, GL_REPEAT);
14             glSamplerParameteri (_id, GL_TEXTURE_WRAP_T, GL_REPEAT);
15             glSamplerParameteri (_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
16             glSamplerParameteri (_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
17             
18             _textureUnit = 0;
19         }
20         
21         ///
22         ~this(){
23             glDeleteSamplers(1, cast(uint*)&_id);
24         }
25         
26         ///
27         void begin(){
28             int savedID;
29             glGetIntegerv(GL_SAMPLER_BINDING ,&savedID);
30             _savedIDs ~= savedID;
31             glBindSampler(0, _id);
32         }
33 
34         ///
35         int textureUnit()const{
36             return _textureUnit;
37         }
38         
39         ///
40         Sampler textureUnit(in int n){
41             _textureUnit = n;
42             return this;
43         }
44         
45         ///
46         void end(){
47             import std.range;
48             glBindSampler(_textureUnit, _savedIDs[$-1]);
49             if (_savedIDs.length == 0) {
50                 assert(_textureUnit, "stack is empty");
51             }else{
52                 _savedIDs.popBack;
53             }
54         }
55     }//public
56 
57     private{
58         int _id;
59         int[] _savedIDs;
60         int _textureUnit;
61     }//private
62 }//class Sampler