2.12.2021, 9:00 - 11:00: Due to updates GitLab may be unavailable for some minutes between 09:00 and 11:00.

xorbitmask.frag 1.98 KB
Newer Older
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
// ================================================================================================
// 
// This file is part of the CAMPVis Software Framework.
// 
// If not explicitly stated otherwise: Copyright (C) 2012-2013, all rights reserved,
//      Christian Schulte zu Berge <christian.szb@in.tum.de>
//      Chair for Computer Aided Medical Procedures
//      Technische Universitt Mnchen
//      Boltzmannstr. 3, 85748 Garching b. Mnchen, Germany
// 
// For a full list of authors and contributors, please refer to the file "AUTHORS.txt".
// 
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file 
// except in compliance with the License. You may obtain a copy of the License at
// 
// http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software distributed under the 
// License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
// either express or implied. See the License for the specific language governing permissions 
// and limitations under the License.
// 
// ================================================================================================

25
layout(location = 0) out uvec4 result;
26
27

void main() {
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
    const uint ALL_ONES = uint(0xFFFFFFFF);
    uvec4[129] bitmask;
    for (int e = 0; e < 4; ++e) {
        for (int b = 0; b < 32; ++b) {
            int idx = 32*e + b;

            if (e == 0)
                bitmask[idx] = uvec4(ALL_ONES << b, ALL_ONES, ALL_ONES, ALL_ONES);
            else if (e == 1)
                bitmask[idx] = uvec4(0, ALL_ONES << b, ALL_ONES, ALL_ONES);
            else if (e == 2)
                bitmask[idx] = uvec4(0, 0, ALL_ONES << b, ALL_ONES);
            else if (e == 3)
                bitmask[idx] = uvec4(0, 0, 0, ALL_ONES << b);
        }
    }
    bitmask[128] = uvec4(0);

    int a = clamp(int(gl_FragCoord.x), 0, 127);
    int b = clamp(int(gl_FragCoord.y) + 1, 0, 128);

    result = bitmask[a] ^ bitmask[b];
50
}