X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fcolorcurve.h;h=d7589cb565b8bacd4f63c0f60d672b294ec7d9bf;hb=a480d4cc323db7cc77388f5af0094dd593dc66e9;hp=75e7fd302a76a2bea330162942c7c881379dd2c5;hpb=aa987216b92584aafc0ecbc3d578606018078f91;p=libs%2Fgl.git

diff --git a/source/colorcurve.h b/source/colorcurve.h
index 75e7fd30..d7589cb5 100644
--- a/source/colorcurve.h
+++ b/source/colorcurve.h
@@ -1,5 +1,5 @@
-#ifndef COLORCURVE_H_
-#define COLORCURVE_H_
+#ifndef MSP_GL_COLORCURVE_H_
+#define MSP_GL_COLORCURVE_H_
 
 #include "postprocessor.h"
 #include "program.h"
@@ -14,7 +14,9 @@ Processes oversaturated colors to preserve hues.  When one color component
 exceeds 1.0, the others are scaled towards white.  A transition curve is also
 applied near 1.0 to prevent the abrupt change in the gradient.
 
-Only makes sense when used in an HDR framebuffer.
+Gamma or sRGB correction can also be applied to the output.  It can be used to
+improve color reproduction by performing lighting calculations in linear color
+space and converting to sRGB for display.
 */
 class ColorCurve: public PostProcessor
 {
@@ -35,8 +37,15 @@ public:
 	saturated value. */
 	void set_brightness(float);
 
+	/** Sets the gamma value used for mapping output colors.  Allowed range is
+	from 0.1 to 10. */
 	void set_gamma(float);
+
+	/** Sets output mapping to sRGB.  This is almost, but not exactly equivalent
+	to set_gamma(2.2). */
 	void set_srgb();
+
+	/// Sets output mapping to linear.  This is equivalent to set_gamma(1).
 	void set_linear();
 
 	virtual void render(const Texture2D &, const Texture2D &);