anchovy.vao source code

1 /**
2 Copyright: Copyright (c) 2017 Andrey Penechko.
3 License: $(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 module anchovy.vao;
7 
8 import derelict.opengl3.gl3;
9 import anchovy.glerrors;
10 import anchovy.vbo;
11 
12 enum PrimitiveType : GLenum
13 {
14 	POINTS = GL_POINTS,
15 	LINE_STRIP = GL_LINE_STRIP,
16 	LINE_LOOP = GL_LINE_LOOP,
17 	LINES = GL_LINES,
18 	LINE_STRIP_ADJACENCY = GL_LINE_STRIP_ADJACENCY,
19 	LINES_ADJACENCY = GL_LINES_ADJACENCY,
20 	TRIANGLE_STRIP = GL_TRIANGLE_STRIP,
21 	TRIANGLE_FAN = GL_TRIANGLE_FAN,
22 	TRIANGLES = GL_TRIANGLES,
23 	TRIANGLE_STRIP_ADJACENCY = GL_TRIANGLE_STRIP_ADJACENCY,
24 	TRIANGLES_ADJACENCY = GL_TRIANGLES_ADJACENCY,
25 	PATCHES = GL_PATCHES,
26 }
27 
28 
29 struct Vao
30 {
31 	//import core.atomic;
32 	//shared static size_t numAllocated;
33 	private GLuint handle_;
34 
35 	GLuint handle() const {
36 		return handle_;
37 	}
38 
39 	bool isGenerated() const {
40 		return handle_ != 0;
41 	}
42 
43 	void gen() {
44 		if (isGenerated) return;
45 		//atomicOp!"+="(numAllocated, 1);
46 		checkgl!glGenVertexArrays(1, &handle_);
47 	}
48 
49 	void del() {
50 		//if (handle_ != 0) atomicOp!"-="(numAllocated, 1);
51 		checkgl!glDeleteVertexArrays(1, &handle_);
52 	}
53 
54 	void bind() const {
55 		assert(isGenerated);
56 		checkgl!glBindVertexArray(handle_);
57 	}
58 
59 	static void unbind() {
60 		checkgl!glBindVertexArray(0);
61 	}
62 
63 	// requires binding
64 	void drawArrays(PrimitiveType mode, int first, int count) const {
65 		checkgl!glDrawArrays(mode, first, count);
66 	}
67 }