voxelman.graphics.vbo source code

1 /**
2 Copyright: Copyright (c) 2017-2018 Andrey Penechko.
3 License: $(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 module voxelman.graphics.vbo;
7 
8 import voxelman.graphics.gl;
9 
10 
11 struct Vbo
12 {
13 	import core.atomic;
14 	shared static size_t numAllocated;
15 
16 	private GLuint handle_;
17 	private size_t uploadedBytes_;
18 
19 	GLuint handle() const {
20 		return handle_;
21 	}
22 
23 	// data size in bytes
24 	size_t uploadedBytes() const {
25 		return uploadedBytes_;
26 	}
27 
28 	bool isGenerated() const {
29 		return handle_ != 0;
30 	}
31 
32 	bool empty() const {
33 		return uploadedBytes_ == 0;
34 	}
35 
36 	void gen() {
37 		if (isGenerated) return;
38 		checkgl!glGenBuffers(1, &handle_);
39 		atomicOp!"+="(numAllocated, 1);
40 	}
41 
42 	void del() {
43 		if (handle_ == 0) return;
44 		atomicOp!"-="(numAllocated, 1);
45 		checkgl!glDeleteBuffers(1, &handle_);
46 		uploadedBytes_ = 0;
47 	}
48 
49 	void bind() const {
50 		assert(isGenerated);
51 		checkgl!glBindBuffer(GL_ARRAY_BUFFER, handle_);
52 	}
53 
54 	static void unbind() {
55 		checkgl!glBindBuffer(GL_ARRAY_BUFFER, 0);
56 	}
57 
58 	// requires binding
59 	void uploadData(Vert)(const Vert[] data, int usage = GL_STATIC_DRAW) {
60 		uploadedBytes_ = data.length*Vert.sizeof;
61 		checkgl!glBufferData(GL_ARRAY_BUFFER, uploadedBytes_, data.ptr, usage);
62 	}
63 }