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
|
/* ColoredSingleChannelAnaglyphShader.frag.txt
*
* A more complex conversion shader for color anaglyphs than the one
* hard-wired into PTBs Screen command. Applies full 3x3 color gain
* matrix to color of one view channel, then optionally applies
* gamma correction to the red output channel.
*
* Standard anaglyph conversion is implemented by the default shader in
* Screen() and can be parameterized by SetAnaglyphStereoParameters.
*
* This shader is used for more complex/exotic ways of anaglyph conversion.
*
* Loaded/initialized by PsychColorCorrection.m as part of
* the PTB imaging pipeline color anaglyph shading support.
* Parameterized by SetAnaglyphStereoParameters.
*
* (C) 2012 Mario Kleiner - Released to you under MIT license.
*/
/* 3 by 3 color gain matrices, always denoted GainsLeft, even for right channel: */
uniform mat3 GainsLeft;
/* Gamma value for red out channel - Set zero for no gamma correction! */
uniform float RedGamma;
vec4 icmTransformColor(vec4 incolor)
{
vec4 outcolor;
/* Multiply first 3 vector components with matrix: */
outcolor.rgb = GainsLeft * incolor.rgb;
/* Alpha is passed through unmodified: */
outcolor.a = incolor.a;
/* Apply gamma correction to red channel, if requested: */
/* Note: This op is expensive on GPUs without dynamic flow control! */
if (RedGamma > 0.0) outcolor.r = pow(outcolor.r, RedGamma);
return(outcolor);
}
|
