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/* FDF shader for sampling of rendered silhouette at provided random
* sampling positions in order to update sample distribution.
*
* (c) 2008 by Mario Kleiner, licensed under MIT license.
*/
#extension GL_ARB_texture_rectangle : enable
uniform sampler2DRect SilSamplePositions;
uniform sampler2DRect Silhouette;
uniform vec4 TextureOffsetBias;
void main(void)
{
/* Read sample position from random textures RA channels */
vec2 pos = texture2DRect(SilSamplePositions, gl_TexCoord[0].st).ra;
/* Readout sample location from Silhouette - Writeout to sampleBuffer: */
gl_FragColor = texture2DRect(Silhouette, pos);
/* Need to remap texture coordinate range to available range in trackingBuffer: */
gl_FragColor.xy = (gl_FragColor.xy - TextureOffsetBias.xy) * TextureOffsetBias.zw;
}
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