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/* InterleavedLineStereoShader.frag.txt - Shader for interleaved line stereo:
*
* Used in the stereo compositing chain of the Psychtoolbox imaging pipeline.
*
* Composes an interleaved stereo image by putting the left eye images pixel
* lines into the even rows of the output buffer and the right eye images pixel
* lines into the odd rows of the output buffer, thereby interleaving the
* content of both eyes buffers into one unified interlaced buffer.
*
* This stereo encoding can be used by some stereo goggles, e.g., the
* "iGlasses 3D Video Goggles".
*
* Written 2007 by Mario Kleiner, part of the Psychtoolbox-3, licensed under
* MIT license.
*
*/
#extension GL_ARB_texture_rectangle : enable
/* Input image rectangle textures: Image1 = Left, Image2 = Right eye */
uniform sampler2DRect Image1;
uniform sampler2DRect Image2;
uniform vec2 Offset;
void main()
{
/* Get default texel read position (x,y): x is column, y is row of image. */
vec2 pos = gl_FragCoord.xy;
/* oddrow == 1 for odd lines, 0 for even lines: */
float oddrow = mod(pos.y, 2.0);
/* Update the y component to only read upper half of all lines in images: */
pos.y = (pos.y - oddrow) / 2.0;
pos = pos + Offset;
/* Read the image pixel from the modified readpos, output it to framebuffer. */
/* Choose between left- and right- image input buffer, depending if this is */
/* an even or an odd output row: */
if (oddrow < 1.0) {
/* Even row: Left image */
gl_FragColor = texture2DRect(Image1, pos);
}
else {
/* Odd row: Right image */
gl_FragColor = texture2DRect(Image2, pos);
}
}
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