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/* ColoredAnaglyphsShader.frag.txt
*
* A more complex conversion shader for color anaglyphs than the one
* hard-wired into PTBs Screen command. Applies full 3x3 color gain
* matrices to colors of each view channel, then adds them up, 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 and used by SetAnaglyphStereoParameters.m as part of
* the PTB imaging pipelines color anaglyph shading support.
*
* (C) 2007 Mario Kleiner - Released to you under MIT license.
*/
#extension GL_ARB_texture_rectangle : enable
/* Left image channel and right image channel: */
uniform sampler2DRect Image1;
uniform sampler2DRect Image2;
/* 3 by 3 color gain matrices for left- right- channel: */
uniform mat3 GainsLeft;
uniform mat3 GainsRight;
/* Gamma value for red out channel - Set zero for no gamma correction! */
uniform float RedGamma;
void main()
{
/* Lookup RGB pixel colors in left- and right buffer: */
vec3 incolor1 = texture2DRect(Image1, gl_TexCoord[0].st).rgb;
vec3 incolor2 = texture2DRect(Image2, gl_TexCoord[0].st).rgb;
/* Multiply each vector with its corresponding xform matrix: */
vec3 channel1 = GainsLeft * incolor1;
vec3 channel2 = GainsRight * incolor2;
/* Add them up to form final output fragment RGB color: */
gl_FragColor.rgb = channel1 + channel2;
/* Alpha is forced to 1 - It does not matter anymore: */
gl_FragColor.a = 1.0;
/* Apply gamma correction to red channel, if requested: */
/* Note: This op is expensive on GPUs without dynamic flow control! */
if (RedGamma > 0.0) gl_FragColor.r = pow(gl_FragColor.r, RedGamma);
}
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