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/* Shader for video deinterlacing - Extracts either the even- or odd- field
* (even or odd rows) of an interlaced image texture and replicates them.
* This is the most simple form of deinterlacing.
*
* This code is beta quality. It doesn't work yet with filtered texture
* drawing, and could be more optimized.
*
* Written 2007 by Mario Kleiner, part of the Psychtoolbox-3, licensed under
* MIT license.
*
*/
#extension GL_ARB_texture_rectangle : enable
/* UseOddField: To be set by usercode - 0 = Extract even lines, 1 = Extract odd lines. */
uniform float UseOddField;
/* Input image rectangle texture: */
uniform sampler2DRect Image1;
void main()
{
/* Get default texel read position (s,t): s is column, t is row of image. */
vec2 readpos = gl_TexCoord[0].st;
/* Update the t (==row) component to only read even or odd lines, replicating them. */
readpos.t = readpos.t - mod(readpos.t, 2.0) + UseOddField;
/* Read the image pixel from the modified readpos, output it to framebuffer. */
gl_FragColor = texture2DRect(Image1, readpos);
}
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