1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
<?xml version="1.0" encoding="UTF-8"?>
<draft href="OES_fbo_render_mipmap/">
<name>OES_fbo_render_mipmap</name>
<contact> <a href="https://www.khronos.org/webgl/public-mailing-list/">WebGL
working group</a> (public_webgl 'at' khronos.org) </contact>
<contributors>
<contributor>Florian Boesch (pyalot 'at' gmail.com)</contributor>
<contributor>Members of the WebGL working group</contributor>
</contributors>
<number>28</number>
<depends>
<api version="1.0"/>
<core version="2.0" />
</depends>
<overview>
<mirrors href="https://www.khronos.org/registry/gles/extensions/OES/OES_fbo_render_mipmap.txt"
name="OES_fbo_render_mipmap">
</mirrors>
<features>
<feature>
Any level of a texture can be attached to a framebuffer object.
</feature>
</features>
</overview>
<idl xml:space="preserve">
[NoInterfaceObject]
interface OES_fbo_render_mipmap {
};
</idl>
<samplecode xml:space="preserve">
<pre>
var extension = gl.getExtension('OES_fbo_render_mipmap');
if(extension !=== null){
var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
var fbos = [];
for(var level=0; level<7; level++){
var size = 128/Math.pow(2, level);
gl.texImage2D(gl.TEXTURE_2D, level, gl.RGBA, size, size, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, texture, level);
fbos.push(fbo);
var fboStatus = gl.checkFramebufferStatus(gl.FRAMEBUFFER);
console.assert(fboStatus == gl.FRAMEBUFFER_COMPLETE, 'Framebuffer is not complete');
}
gl.bindTexture(gl.TEXTURE_2D, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
console.assert(gl.getError() == gl.NO_ERROR, 'A GL error occured');
}
</pre>
</samplecode>
<history>
<revision date="2015/01/26">
<change>Initial revision.</change>
</revision>
<revision date="2015/01/31">
<change>Moved to draft.</change>
</revision>
</history>
</draft>
|
