X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=gamma_compression_effect_rec709.frag;fp=gamma_compression_effect_rec709.frag;h=807cd4995c0796d800d51eeae8628be6106450d2;hb=d4542f76df5d26843c68b1467e76722cffd801a1;hp=0000000000000000000000000000000000000000;hpb=873b60b640a96c8fb4c2d8c88c85d20e0a2dca6b;p=movit

diff --git a/gamma_compression_effect_rec709.frag b/gamma_compression_effect_rec709.frag
new file mode 100644
index 0000000..807cd49
--- /dev/null
+++ b/gamma_compression_effect_rec709.frag
@@ -0,0 +1,31 @@
+// Compress to Rec. 601/Rec. 709 gamma curve.
+
+#if 0
+
+// if we have the lut
+uniform sampler1D PREFIX(rec709_inverse_tex);
+
+vec4 FUNCNAME(vec2 tc) {
+	vec4 x = LAST_INPUT(tc);
+
+	x.r = texture1D(PREFIX(rec709_inverse_tex), x.r).x;
+	x.g = texture1D(PREFIX(rec709_inverse_tex), x.g).x;
+	x.b = texture1D(PREFIX(rec709_inverse_tex), x.b).x;
+
+	return x;
+}
+
+#else
+
+// use arithmetic (slow)
+vec4 FUNCNAME(vec2 tc) {
+	vec4 x = LAST_INPUT(tc);
+
+	vec3 a = vec3(4.5) * x.rgb;
+	vec3 b = vec3(1.099) * pow(x.rgb, vec3(0.45)) - vec3(0.099);
+	vec3 f = vec3(greaterThan(x.rgb, vec3(0.018)));
+
+	return vec4(mix(a, b, f), x.a); 
+}
+ 
+#endif