anchovy.graphics.texrectarray source code

1 /*
2 Copyright (c) 2013 Andrey Penechko
3 
4 Boost Software License - Version 1.0 - August 17th, 2003
5 
6 Permission is hereby granted, free of charge, to any person or organization
7 obtaining a copy of the software and accompanying documentation covered by
8 this license the "Software" to use, reproduce, display, distribute,
9 execute, and transmit the Software, and to prepare derivative works of the
10 Software, and to permit third-parties to whom the Software is furnished to
11 do so, all subject to the following:
12 
13 The copyright notices in the Software and this entire statement, including
14 the above license grant, this restriction and the following disclaimer,
15 must be included in all copies of the Software, in whole or in part, and
16 all derivative works of the Software, unless such copies or derivative
17 works are solely in the form of machine-executable object code generated by
18 a source language processor.
19 
20 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
23 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
24 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
25 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
26 DEALINGS IN THE SOFTWARE.
27 */
28 
29 module anchovy.graphics.texrectarray;
30 
31 import derelict.opengl3.gl3;
32 
33 import anchovy.core.types;
34 
35 struct TexVertex
36 {
37 	this(int a, int b, int c, int d)
38 	{
39 		x = cast(short) a;
40 		y = cast(short) b;
41 		s = cast(ushort) c;
42 		t = cast(ushort) d;
43 	}
44 
45 align(1):
46 	short x, y;
47 	ushort s, t;
48 }
49 
50 
51 class TexRectArray
52 {
53 	TexVertex[] vertieces;
54 	this()
55 	{
56 		glGenVertexArrays(1, &vao);
57 		glGenBuffers(1,&vbo);
58 	}
59 
60 	void close()
61 	{
62 		glDeleteVertexArrays(1, &vao);
63 		glDeleteBuffers(1,&vbo);
64 	}
65 
66 	TexRectArray appendQuad(Rect geometryQuad, Rect textureQuad)
67 	{
68 		alias geometryQuad gq;
69 		alias textureQuad tq;
70 		TexVertex[4] vert;
71 		vert[0] = TexVertex(gq.x, gq.y + gq.height, tq.x, tq.y + tq.height);//lower left
72 		vert[1] = TexVertex(gq.x, gq.y, tq.x, tq.y);//upper left
73 		vert[2] = TexVertex(gq.x + gq.width, gq.y, tq.x + tq.width, tq.y);//upper right
74 		vert[3] = TexVertex(gq.x + gq.width, gq.y+ gq.height, tq.x + tq.width, tq.y + tq.height);//lower right
75 
76 		vertieces ~= vert[0];
77 		vertieces ~= vert[1];
78 		vertieces ~= vert[2];
79 		vertieces ~= vert[0];
80 		vertieces ~= vert[2];
81 		vertieces ~= vert[3];
82 		return this;
83 	}
84 
85 	void load()
86 	{
87 		glBindVertexArray(vao);
88 		glBindBuffer(GL_ARRAY_BUFFER, vbo );
89 		glBufferData(GL_ARRAY_BUFFER, vertieces.length * TexVertex.sizeof, vertieces.ptr, GL_STATIC_DRAW);
90 		glEnableVertexAttribArray(0);
91 		glEnableVertexAttribArray(1);
92 		glVertexAttribPointer(0, 2, GL_SHORT, GL_FALSE, 4*short.sizeof, null);
93 		glVertexAttribPointer(1, 2, GL_UNSIGNED_SHORT, GL_FALSE, 4*short.sizeof, cast(void*)(2*short.sizeof));
94 
95 		glBindBuffer(GL_ARRAY_BUFFER,0);
96 		glBindVertexArray(0);
97 	}
98 
99 	void bind()
100 	{
101 		glBindVertexArray(vao);
102 	}
103 
104 	void draw()
105 	{
106 		glDrawArrays(GL_TRIANGLES, 0, cast(uint)vertieces.length);
107 	}
108 
109 	void unbind()
110 	{
111 		glBindVertexArray(0);
112 	}
113 
114 	uint vao, vbo;
115 }