lygia/space/nearest)sampling function to make a texture behave like GL_NEAREST
Use:
nearest(vec2 st, <vec2> res)
#ifndef NEAREST_FLOOR_FNC
#define NEAREST_FLOOR_FNC(UV) floor(UV)
#endif
#ifndef FNC_NEAREST
#define FNC_NEAREST
vec2 nearest(in vec2 v, in vec2 res) {
vec2 offset = 0.5 / (res - 1.0);
return NEAREST_FLOOR_FNC(v * res) / res + offset;
}
#endif
Use:
nearest(float2 st, <float2> resolution)
#ifndef FNC_NEAREST
#define FNC_NEAREST
float2 nearest(in float2 st, in float2 resolution) {
float2 offset = .5 / (resolution - 1.);
return floor(st * resolution) / resolution + offset;
}
#endif
fn nearest(v: vec2f, res: vec2f) -> vec2f {
let offset = 0.5 / (res - 1.0);
return floor(v * res) / res + offset;
}
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