Update mpv config:

mpv/shaders/hdr-toys/transfer-function/bt1886_inv.glsl

@@ -0,0 +1,28 @@
+// https://www.itu.int/rec/R-REC-BT.1886
+
+//!HOOK OUTPUT
+//!BIND HOOKED
+//!DESC transfer function (bt.1886, inverse)
+
+float bt1886_eotf(float V, float gamma, float Lw, float Lb) {
+    float a = pow(pow(Lw, 1.0 / gamma) - pow(Lb, 1.0 / gamma), gamma);
+    float b = pow(Lb, 1.0 / gamma) / (pow(Lw, 1.0 / gamma) - pow(Lb, 1.0 / gamma));
+    float L = a * pow(max(V + b, 0.0), gamma);
+    return L;
+}
+
+vec3 bt1886_eotf(vec3 color, float gamma, float Lw, float Lb) {
+    return vec3(
+        bt1886_eotf(color.r, gamma, Lw, Lb),
+        bt1886_eotf(color.g, gamma, Lw, Lb),
+        bt1886_eotf(color.b, gamma, Lw, Lb)
+    );
+}
+
+vec4 hook() {
+    vec4 color = HOOKED_tex(HOOKED_pos);
+
+    color.rgb = bt1886_eotf(color.rgb, 2.4, 1.0, 0.001);
+
+    return color;
+}