gfm.opengl.vao source code

1 module gfm.opengl.vao;
2 
3 import std..string;
4 
5 import derelict.opengl3.gl3;
6 
7 import gfm.core.log,
8        gfm.opengl.opengl;
9 
10 /// OpenGL Vertex Array Object wrapper.
11 final class VAO
12 {
13     public
14     {
15         /// Creates a VAO.
16         /// Throws: $(D OpenGLException) on error.
17         this(OpenGL gl, GLuint target, GLuint storage, GLuint usage)
18         {
19             _gl = gl;
20             glGenVertexArrays(1, &_handle);
21             gl.runtimeCheck();
22             _initialized = true;
23         }
24 
25         ~this()
26         {
27             close();
28         }
29 
30         /// Releases the OpenGL VAO resource.
31         void close()
32         {
33             if (_initialized)
34             {
35                 glDeleteVertexArrays(1, &_handle);
36                 _initialized = false;
37             }
38         }
39 
40         /// Uses this VAO.
41         /// Throws: $(D OpenGLException) on error.
42         void bind()
43         {
44             glBindVertexArray(_handle);
45             _gl.runtimeCheck();
46         }
47 
48         /// Unuses this VAO.
49         /// Throws: $(D OpenGLException) on error.
50         void unbind() 
51         {
52             glBindVertexArray(0);
53             _gl.runtimeCheck();
54         }
55 
56         /// Returns: Wrapped OpenGL resource handle.
57         GLuint handle() pure const nothrow
58         {
59             return _handle;
60         }
61     }
62 
63     private
64     {
65         OpenGL _gl;
66         GLuint _handle;
67         bool _initialized;
68     }
69 }