X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=blur_effect.h;h=0c7dccc826b9ae9ccb4be6b352aa1e288fb787e9;hp=09c6f14117f47266e3ec53449202b7f829274bd3;hb=60cc8cf581ceaac4eb7e636e85f9e6161005701d;hpb=f25eed80a570ae049f03b098757a070188efbc39

diff --git a/blur_effect.h b/blur_effect.h
index 09c6f14..0c7dccc 100644
--- a/blur_effect.h
+++ b/blur_effect.h
@@ -1,18 +1,48 @@
 #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;
+
 class BlurEffect : public Effect {
 public:
 	BlurEffect();
+
+	virtual std::string output_fragment_shader() {
+		assert(false);
+	}
+	virtual void set_uniforms(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) {
+		assert(false);
+	}
+
+	virtual bool needs_many_samples() 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);
+	
+private:
+	SingleBlurPassEffect *hpass, *vpass;
+};
+
+class SingleBlurPassEffect : public Effect {
+public:
+	SingleBlurPassEffect();
 	std::string output_fragment_shader();
 
 	virtual bool needs_many_samples() const { return true; }
 	virtual bool needs_mipmaps() const { return true; }
 
 	void set_uniforms(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
-
+	
 	enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
 
 private: