Update mpv config:

mpv/shaders/hdr-toys/utils/exposure.glsl

@@ -0,0 +1,28 @@
+// https://en.wikipedia.org/wiki/Exposure_value
+
+//!PARAM exposure_value
+//!TYPE float
+//!MINIMUM -64
+//!MAXIMUM  64
+0.0
+
+//!HOOK OUTPUT
+//!BIND HOOKED
+//!WHEN exposure_value
+//!DESC exposure
+
+float exposure(float x, float ev) {
+    return x * exp2(ev);
+}
+
+vec3 exposure(vec3 x, float ev) {
+    return x * exp2(ev);
+}
+
+vec4 hook() {
+    vec4 color = HOOKED_tex(HOOKED_pos);
+
+    color.rgb = exposure(color.rgb, exposure_value);
+
+    return color;
+}