voxelman.graphics.vao 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.vao;
7 
8 import voxelman.graphics.gl;
9 import voxelman.graphics.vbo;
10 
11 enum PrimitiveType : GLenum
12 {
13 	POINTS = GL_POINTS,
14 	LINE_STRIP = GL_LINE_STRIP,
15 	LINE_LOOP = GL_LINE_LOOP,
16 	LINES = GL_LINES,
17 	//LINE_STRIP_ADJACENCY = GL_LINE_STRIP_ADJACENCY,
18 	//LINES_ADJACENCY = GL_LINES_ADJACENCY,
19 	TRIANGLE_STRIP = GL_TRIANGLE_STRIP,
20 	TRIANGLE_FAN = GL_TRIANGLE_FAN,
21 	TRIANGLES = GL_TRIANGLES,
22 	//TRIANGLE_STRIP_ADJACENCY = GL_TRIANGLE_STRIP_ADJACENCY,
23 	//TRIANGLES_ADJACENCY = GL_TRIANGLES_ADJACENCY,
24 	//PATCHES = GL_PATCHES,
25 }
26 
27 
28 struct Vao
29 {
30 	//import core.atomic;
31 	//shared static size_t numAllocated;
32 	private GLuint handle_;
33 
34 	GLuint handle() const {
35 		return handle_;
36 	}
37 
38 	bool isGenerated() const {
39 		return handle_ != 0;
40 	}
41 
42 	void gen() {
43 		if (isGenerated) return;
44 		//atomicOp!"+="(numAllocated, 1);
45 		checkgl!glGenVertexArrays(1, &handle_);
46 	}
47 
48 	void del() {
49 		//if (handle_ != 0) atomicOp!"-="(numAllocated, 1);
50 		checkgl!glDeleteVertexArrays(1, &handle_);
51 	}
52 
53 	void bind() const {
54 		assert(isGenerated);
55 		checkgl!glBindVertexArray(handle_);
56 	}
57 
58 	static void unbind() {
59 		checkgl!glBindVertexArray(0);
60 	}
61 
62 	// requires binding
63 	void drawArrays(PrimitiveType mode, int first, int count) const {
64 		checkgl!glDrawArrays(mode, first, count);
65 	}
66 }