X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=blur_effect.h;h=a440949f00901beb8b7eb206b1b45be23678ac0f;hp=0657136181066042391e91baf4e9672fb7f4ef02;hb=fe785e6f62ab58ef05972850d9275005794505b7;hpb=b5e3174594efe9a920621a68d3b28f5e44676d03

diff --git a/blur_effect.h b/blur_effect.h
index 0657136..a440949 100644
--- a/blur_effect.h
+++ b/blur_effect.h
@@ -1,20 +1,57 @@
 #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 bool needs_srgb_primaries() const { return false; }
+
+	virtual std::string output_fragment_shader() {
+		assert(false);
+	}
+	virtual void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) {
+		assert(false);
+	}
+
+	virtual bool needs_texture_bounce() const { return true; }
+	virtual bool needs_mipmaps() const { return true; }
+	virtual void add_self_to_effect_chain(EffectChain *chain, const std::vector<Effect *> &input);
+	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_srgb_primaries() const { return false; }
+	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);
+	void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+	void clear_gl_state();
+	
+	enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
 
 private:
 	float radius;
+	Direction direction;
 };
 
 #endif // !defined(_BLUR_EFFECT_H)