port from perforce

hgplus/ShaderMinifier/tests/real/extatique/log.fs

@@ -0,0 +1,20 @@
+uniform sampler2D tex;
+uniform float invGamma;
+
+const vec3 LUMINANCECONV = vec3(0.11,0.6,0.29);
+void main()
+{	
+	vec2 p = gl_TexCoord[0].xy;	
+	
+	
+	
+	vec3 sample = texture2D(tex, p).xyz;
+	
+	
+	sample = log2(sample + vec3(1.0));
+	float luminance = dot(LUMINANCECONV, sample);
+	
+	vec3 sampleC = sample  * vec3(pow(luminance,invGamma)); 
+	
+	gl_FragColor = gl_Color * vec4(sampleC,1.0);
+}