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Add the whole ass shader

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Xonk
2023-01-12 15:00:14 -05:00
parent 9deb7413a6
commit f82426c609
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shaders/world-1/lib/ACESSPL.glsl Normal file
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#define log10(x) log(x) / log(10.0)
struct SegmentedSplineParams_c5 {
float coefsLow[6]; // coefs for B-spline between minPoint and midPoint (units of log luminance)
float coefsHigh[6]; // coefs for B-spline between midPoint and maxPoint (units of log luminance)
vec2 minPoint; // {luminance, luminance} linear extension below this
vec2 midPoint; // {luminance, luminance}
vec2 maxPoint; // {luminance, luminance} linear extension above this
float slopeLow; // log-log slope of low linear extension
float slopeHigh; // log-log slope of high linear extension
};
struct SegmentedSplineParams_c9 {
float coefsLow[10]; // coefs for B-spline between minPoint and midPoint (units of log luminance)
float coefsHigh[10]; // coefs for B-spline between midPoint and maxPoint (units of log luminance)
float slopeLow; // log-log slope of low linear extension
float slopeHigh; // log-log slope of high linear extension
};
const mat3 M = mat3(
0.5, -1.0, 0.5,
-1.0, 1.0, 0.5,
0.5, 0.0, 0.0
);
float segmented_spline_c5_fwd(float x) {
const SegmentedSplineParams_c5 C = SegmentedSplineParams_c5(
float[6] ( -4.0000000000, -4.0000000000, -3.1573765773, -0.4852499958, 1.8477324706, 1.8477324706 ),
float[6] ( -0.7185482425, 2.0810307172, 3.6681241237, 4.0000000000, 4.0000000000, 4.0000000000 ),
vec2(0.18*exp2(-15.0), 0.0001),
vec2(0.18, 4.8),
vec2(0.18*exp2(18.0), 10000.),
0.0,
0.0
);
const int N_KNOTS_LOW = 4;
const int N_KNOTS_HIGH = 4;
// Check for negatives or zero before taking the log. If negative or zero,
// set to ACESMIN.1
float xCheck = x <= 0 ? exp2(-14.0) : x;
float logx = log10( xCheck);
float logy;
if (logx <= log10(C.minPoint.x)) {
logy = logx * C.slopeLow + (log10(C.minPoint.y) - C.slopeLow * log10(C.minPoint.x));
} else if ((logx > log10(C.minPoint.x)) && (logx < log10(C.midPoint.x))) {
float knot_coord = (N_KNOTS_LOW-1) * (logx-log10(C.minPoint.x))/(log10(C.midPoint.x)-log10(C.minPoint.x));
int j = int(knot_coord);
float t = knot_coord - float(j);
vec3 cf = vec3( C.coefsLow[ j], C.coefsLow[ j + 1], C.coefsLow[ j + 2]);
vec3 monomials = vec3(t * t, t, 1.0);
logy = dot( monomials, M * cf);
} else if ((logx >= log10(C.midPoint.x)) && (logx < log10(C.maxPoint.x))) {
float knot_coord = (N_KNOTS_HIGH - 1) * (logx - log10(C.midPoint.x)) / (log10(C.maxPoint.x) - log10(C.midPoint.x));
int j = int(knot_coord);
float t = knot_coord - float(j);
vec3 cf = vec3(C.coefsHigh[j], C.coefsHigh[j + 1], C.coefsHigh[j + 2]);
vec3 monomials = vec3(t * t, t, 1.0);
logy = dot(monomials, M * cf);
} else {
logy = logx * C.slopeHigh + (log10(C.maxPoint.y) - C.slopeHigh * log10(C.maxPoint.x));
}
return pow(10.0, logy);
}
float segmented_spline_c9_fwd( float x, const SegmentedSplineParams_c9 C, const mat3x2 toningPoints) {
const int N_KNOTS_LOW = 8;
const int N_KNOTS_HIGH = 8;
// Check for negatives or zero before taking the log. If negative or zero,
// set to OCESMIN.
float xCheck = x <= 0 ? 1e-4 : x;
vec2 minPoint = toningPoints[0];
vec2 midPoint = toningPoints[1];
vec2 maxPoint = toningPoints[2];
float logx = log10(xCheck);
float logy;
if (logx <= log10(minPoint.x)) {
logy = logx * C.slopeLow + (log10(minPoint.y) - C.slopeLow * log10(minPoint.x));
} else if ((logx > log10(minPoint.x)) && (logx < log10(midPoint.x))) {
float knot_coord = (N_KNOTS_LOW - 1) * (logx - log10(minPoint.x)) / (log10(midPoint.x) - log10(minPoint.x));
int j = int(knot_coord);
float t = knot_coord - float(j);
vec3 cf = vec3(C.coefsLow[j], C.coefsLow[j + 1], C.coefsLow[j + 2]);
vec3 monomials = vec3(t * t, t, 1.0);
logy = dot(monomials, M * cf);
} else if ((logx >= log10(midPoint.x)) && (logx < log10(maxPoint.x))) {
float knot_coord = (N_KNOTS_HIGH - 1) * (logx - log10(midPoint.x)) / (log10(maxPoint.x) - log10(midPoint.x));
int j = int(knot_coord);
float t = knot_coord - float(j);
vec3 cf = vec3(C.coefsHigh[j], C.coefsHigh[j + 1], C.coefsHigh[j + 2]);
vec3 monomials = vec3(t * t, t, 1.0);
logy = dot(monomials, M * cf);
} else {
logy = logx * C.slopeHigh + (log10(maxPoint.y) - C.slopeHigh * log10(maxPoint.x));
}
return pow(10.0, logy);
}