+class SingleBlurPassEffect : public Effect {
+public:
+ // If parent is non-nullptr, calls to inform_input_size will be forwarded
+ // so that it can make reasonable decisions for both blur passes.
+ SingleBlurPassEffect(BlurEffect *parent);
+ virtual ~SingleBlurPassEffect();
+ std::string effect_type_id() const override { return "SingleBlurPassEffect"; }
+
+ std::string output_fragment_shader() override;
+
+ bool needs_texture_bounce() const override { return true; }
+ bool needs_mipmaps() const override { return true; }
+ bool needs_srgb_primaries() const override { return false; }
+ AlphaHandling alpha_handling() const override { return INPUT_PREMULTIPLIED_ALPHA_KEEP_BLANK; }
+
+ void inform_input_size(unsigned input_num, unsigned width, unsigned height) override {
+ if (parent != nullptr) {
+ parent->inform_input_size(input_num, width, height);
+ }
+ }
+ bool changes_output_size() const override { return true; }
+ bool sets_virtual_output_size() const override { return true; }
+ bool one_to_one_sampling() const override { return false; } // Can sample outside the border.
+
+ void get_output_size(unsigned *width, unsigned *height, unsigned *virtual_width, unsigned *virtual_height) const override {
+ *width = this->width;
+ *height = this->height;
+ *virtual_width = this->virtual_width;
+ *virtual_height = this->virtual_height;
+ }
+
+ void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num) override;
+ void clear_gl_state() override;
+
+ enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
+
+private:
+ BlurEffect *parent;
+ int num_taps;
+ float radius;
+ Direction direction;
+ int width, height, virtual_width, virtual_height;
+ float *uniform_samples;
+};
+
+} // namespace movit
+
+#endif // !defined(_MOVIT_BLUR_EFFECT_H)