19 lines
516 B
GLSL
19 lines
516 B
GLSL
// Compute the pixelwise diff between two textures.
|
|
// Computes the diff for each color chanel separately (r, g, b).
|
|
// Assumes both images are not transparent.
|
|
|
|
// try isampler2D, ivec4 etc.? Probably not
|
|
uniform vec2 size;
|
|
// uniform vec2 offs;
|
|
uniform sampler2D base;
|
|
uniform sampler2D curr;
|
|
|
|
void main(void)
|
|
{
|
|
vec2 pos = gl_FragCoord.xy/size;
|
|
vec4 color = texture2D(curr, pos);
|
|
pos.y = 1.0 - pos.y;
|
|
vec4 basecolor = texture2D(base, pos);
|
|
color.rgb = abs(color.rgb - basecolor.rgb);
|
|
gl_FragColor = color;
|
|
}
|