X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=blur_effect.h;h=3f86e1797529d6aadc06ba08611abfde5083a269;hp=ee890c25543fa41599e67d3e9284bfd68d8ee196;hb=f23c7768e6c13d6a719aaea89074d86b74148aeb;hpb=b618b34070d23b6da35c77f004678d8a9e55575b

diff --git a/blur_effect.h b/blur_effect.h
index ee890c2..3f86e17 100644
--- a/blur_effect.h
+++ b/blur_effect.h
@@ -1,6 +1,14 @@
 #ifndef _BLUR_EFFECT_H
 #define _BLUR_EFFECT_H 1
 
+// A separable 2D blur implemented by a combination of mipmap filtering
+// and convolution (essentially giving a convolution with a piecewise linear
+// approximation to the true impulse response).
+//
+// Works in two passes; first horizontal, then vertical (BlurEffect,
+// which is what the user is intended to use, instantiates two copies of
+// SingleBlurPassEffect behind the scenes).
+
 #include "effect.h"
 
 class SingleBlurPassEffect;
@@ -16,7 +24,7 @@ public:
 		assert(false);
 	}
 
-	virtual bool needs_many_samples() const { return true; }
+	virtual bool needs_texture_bounce() const { return true; }
 	virtual bool needs_mipmaps() const { return true; }
 	virtual void add_self_to_effect_chain(std::vector<Effect *> *chain);
 	virtual bool set_float(const std::string &key, float value);
@@ -30,7 +38,7 @@ public:
 	SingleBlurPassEffect();
 	std::string output_fragment_shader();
 
-	virtual bool needs_many_samples() const { return true; }
+	virtual bool needs_texture_bounce() const { return true; }
 	virtual bool needs_mipmaps() const { return true; }
 
 	void set_uniforms(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);