port from perforce

hgplus/ShaderMinifier/tests/real/the orange guy/tonemapping_pixel.glsl

@@ -0,0 +1,18 @@
+uniform sampler2D tex;
+
+void main()
+{	
+	vec3 color = texture2D(tex, gl_TexCoord[0].xy).rgb;
+	float luminance = dot( vec3(0.3, 0.59, 0.11), color);
+	
+	/*float luminance = dot( vec3(0.33, 0.33, 0.33), color);*/
+	
+	 /* [0 .. infinity] is mapped to [0 .. 1] */
+	 
+	float factor = luminance / (1.0 + luminance);
+	
+	/* interesting bug : make black area */
+	/* float factor = sin((luminance * 3.141596 * 0.5) / (1.0 + luminance));*/
+	
+	gl_FragColor = vec4( factor * color, 1.0 );
+}