X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=shaderlib%2Fcolorcurve.glsl;fp=shaderlib%2Fcolorcurve.glsl;h=fa3ba5107600f36f9a9e7b559b31e2b8fb5bf408;hb=e55f79ccb21e8c1be3d86f127e3ec1583e58ce92;hp=0000000000000000000000000000000000000000;hpb=b2764a3a349b48d7445202faa903383386c09a4c;p=libs%2Fgl.git

diff --git a/shaderlib/colorcurve.glsl b/shaderlib/colorcurve.glsl
new file mode 100644
index 00000000..fa3ba510
--- /dev/null
+++ b/shaderlib/colorcurve.glsl
@@ -0,0 +1,29 @@
+import postprocess;
+
+uniform sampler1D curve;
+uniform ToneMapping
+{
+	float peak;
+	float brightness;
+};
+
+////// fragment
+void main()
+{
+	vec4 sample = texture(source, texcoord);
+	float maxc = max(sample.r, max(sample.g, sample.b));
+	if(maxc>1.0-peak)
+	{
+		vec3 saturated = sample.rgb/maxc;
+		if(maxc>1.0+peak)
+		{
+			sample.rgb = mix(vec3(1.0), saturated, 1.0/pow(brightness, maxc-1.0-peak));
+		}
+		else
+		{
+			float x = (1.0+peak-maxc)/(2.0*peak);
+			sample.rgb = saturated.rgb*(1.0-peak+(1.0-x*x)*peak);
+		}
+	}
+	frag_color = vec4(texture(curve, sample.r).r, texture(curve, sample.g).r, texture(curve, sample.b).r, sample.a);
+}