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/* ext is vec4(in_x, in_dy, out_x, out_dy). */
float curve_vec_extrapolate(float x, float y, vec4 ext)
{
if (x < 0.0) {
return y + x * ext.y;
}
else if (x > 1.0) {
return y + (x - 1.0) * ext.w;
}
else {
return y;
}
}
#define RANGE_RESCALE(x, min, range) ((x - min) * range)
void curves_vec(float fac,
vec3 vec,
sampler1DArray curvemap,
float layer,
vec3 range,
vec4 ext_x,
vec4 ext_y,
vec4 ext_z,
out vec3 outvec)
{
vec4 co = vec4(vec, layer);
vec3 xyz_min = vec3(ext_x.x, ext_y.x, ext_z.x);
co.xyz = RANGE_RESCALE(co.xyz, xyz_min, range);
outvec.x = texture(curvemap, co.xw).x;
outvec.y = texture(curvemap, co.yw).y;
outvec.z = texture(curvemap, co.zw).z;
outvec.x = curve_vec_extrapolate(co.x, outvec.r, ext_x);
outvec.y = curve_vec_extrapolate(co.y, outvec.g, ext_y);
outvec.z = curve_vec_extrapolate(co.z, outvec.b, ext_z);
outvec = mix(vec, outvec, fac);
}
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