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/* ext is vec4(in_x, in_dy, out_x, out_dy). */
float curve_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_rgb(float fac,
vec4 col,
sampler1DArray curvemap,
float layer,
vec4 range,
vec4 ext_r,
vec4 ext_g,
vec4 ext_b,
vec4 ext_a,
out vec4 outcol)
{
vec4 co = vec4(RANGE_RESCALE(col.rgb, ext_a.x, range.a), layer);
vec3 samp;
samp.r = texture(curvemap, co.xw).a;
samp.g = texture(curvemap, co.yw).a;
samp.b = texture(curvemap, co.zw).a;
samp.r = curve_extrapolate(co.x, samp.r, ext_a);
samp.g = curve_extrapolate(co.y, samp.g, ext_a);
samp.b = curve_extrapolate(co.z, samp.b, ext_a);
vec3 rgb_min = vec3(ext_r.x, ext_g.x, ext_b.x);
co.xyz = RANGE_RESCALE(samp.rgb, rgb_min, range.rgb);
samp.r = texture(curvemap, co.xw).r;
samp.g = texture(curvemap, co.yw).g;
samp.b = texture(curvemap, co.zw).b;
outcol.r = curve_extrapolate(co.x, samp.r, ext_r);
outcol.g = curve_extrapolate(co.y, samp.g, ext_g);
outcol.b = curve_extrapolate(co.z, samp.b, ext_b);
outcol.a = col.a;
outcol = mix(col, outcol, fac);
}
void curves_rgb_opti(float fac,
vec4 col,
sampler1DArray curvemap,
float layer,
vec4 range,
vec4 ext_a,
out vec4 outcol)
{
vec4 co = vec4(RANGE_RESCALE(col.rgb, ext_a.x, range.a), layer);
vec3 samp;
samp.r = texture(curvemap, co.xw).a;
samp.g = texture(curvemap, co.yw).a;
samp.b = texture(curvemap, co.zw).a;
outcol.r = curve_extrapolate(co.x, samp.r, ext_a);
outcol.g = curve_extrapolate(co.y, samp.g, ext_a);
outcol.b = curve_extrapolate(co.z, samp.b, ext_a);
outcol.a = col.a;
outcol = mix(col, outcol, fac);
}
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