X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=glow_effect.h;h=abadb84a4cb332a10d45216d73a2fe6bfa2edc6c;hp=04b48f9aa165e55ab7ba139dba36c883fb492f9b;hb=7af4d1b54ba141fdb74cd13ddc6110708855d157;hpb=e655afd53f2e56938bd4e7f72640eff56ef4a1ee

diff --git a/glow_effect.h b/glow_effect.h
index 04b48f9..abadb84 100644
--- a/glow_effect.h
+++ b/glow_effect.h
@@ -1,12 +1,14 @@
 #ifndef _GLOW_EFFECT_H
 #define _GLOW_EFFECT_H 1
 
-// Glow: Simply add a blurred version of the image to itself.
+// Glow: Cut out the highlights of the image (everything above a certain threshold),
+// blur them, and overlay them onto the original image.
 
 #include "effect.h"
 
 class BlurEffect;
 class MixEffect;
+class HighlightCutoffEffect;
 
 class GlowEffect : public Effect {
 public:
@@ -27,7 +29,24 @@ public:
 
 private:
 	BlurEffect *blur;
+	HighlightCutoffEffect *cutoff;
 	MixEffect *mix;
 };
 
+// An effect that cuts out only the highlights of an image;
+// anything at the cutoff or below is set to 0.0, and then all other pixels
+// get the cutoff subtracted. Used only as part of GlowEffect.
+
+class HighlightCutoffEffect : public Effect {
+public:
+	HighlightCutoffEffect();
+	virtual std::string effect_type_id() const { return "HighlightCutoffEffect"; }
+	std::string output_fragment_shader();
+	
+	virtual AlphaHandling alpha_handling() const { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+
+private:
+	float cutoff;
+};
+
 #endif // !defined(_GLOW_EFFECT_H)