voxelman.core.chunkmesh source code

1 /**
2 Copyright: Copyright (c) 2013-2016 Andrey Penechko.
3 License: $(WEB boost.org/LICENSE_1_0.txt, Boost License 1.0).
4 Authors: Andrey Penechko.
5 */
6 
7 module voxelman.core.chunkmesh;
8 
9 import voxelman.math;
10 import voxelman.model.vertex;
11 import derelict.opengl3.gl3;
12 import voxelman.core.config : DimentionId;
13 import voxelman.graphics;
14 
15 struct Attribute
16 {
17 	uint location;
18 	uint elementNum;///number of
19 	uint elementType;///GL_FLOAT etc
20 	uint elementSize;///in bytes
21 	uint offset;///offset from the begining of buffer
22 	bool normalized;
23 }
24 
25 struct ChunkMesh
26 {
27 	vec3 position;
28 	DimentionId dimention;
29 	MeshVertex[] data;
30 
31 	bool isDataDirty = true;
32 	static int numBuffersAllocated;
33 
34 	private GLuint vao;
35 	private GLuint vbo;
36 	private bool hasBuffers = false;
37 
38 	private void genBuffers()
39 	{
40 		glGenBuffers(1, &vbo);
41 		glGenVertexArrays(1, &vao);
42 		++numBuffersAllocated;
43 		hasBuffers = true;
44 	}
45 
46 	void deleteBuffers()
47 	{
48 		if (!hasBuffers) return;
49 		glDeleteBuffers(1, &vbo);
50 		glDeleteVertexArrays(1, &vao);
51 		--numBuffersAllocated;
52 		hasBuffers = false;
53 	}
54 
55 	void uploadBuffer()
56 	{
57 		glBindBuffer(GL_ARRAY_BUFFER, vbo);
58 		glBufferData(GL_ARRAY_BUFFER, data.length*MeshVertex.sizeof, data.ptr, GL_STATIC_DRAW);
59 		MeshVertex.setAttributes();
60 		glBindBuffer(GL_ARRAY_BUFFER, 0);
61 	}
62 
63 	void bind()
64 	{
65 		if (!hasBuffers)
66 			genBuffers();
67 		glBindVertexArray(vao);
68 	}
69 
70 	static void unbind()
71 	{
72 		glBindVertexArray(0);
73 	}
74 
75 	void render(bool trianlges)
76 	{
77 		assert(hasBuffers);
78 
79 		if (isDataDirty)
80 		{
81 			uploadBuffer();
82 			isDataDirty = false;
83 		}
84 		if (trianlges)
85 			glDrawArrays(GL_TRIANGLES, 0, cast(uint)numVertexes());//data.length/12);
86 		else
87 			glDrawArrays(GL_LINES, 0, cast(uint)numVertexes());//data.length/12);
88 	}
89 
90 	bool empty() { return data.length == 0; }
91 
92 	ulong numVertexes() {return data.length;}
93 	ulong numTris() {return data.length/3;}
94 	ulong dataBytes() { return data.length * MeshVertex.sizeof; }
95 }
96 
97 alias MeshVertex = VertexPosColor!(float, ubyte);
98