Merge branch 'master' into epoxy

[movit] / slice_effect.h

diff --git a/slice_effect.h b/slice_effect.h
new file mode 100644 (file)
index 0000000..3448941
--- /dev/null
+++ b/slice_effect.h
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+#ifndef _MOVIT_SLICE_EFFECT_H
+#define _MOVIT_SLICE_EFFECT_H 1
+
+// SliceEffect takes an image, cuts it into (potentially overlapping) slices,
+// and puts those slices back together again consecutively. It is primarily
+// useful in an overlap-discard setting, where it can do both the overlap and
+// discard roles, where one does convolutions by means of many small FFTs, but
+// could also work as a (relatively boring) video effect on its own.
+//
+// Note that vertical slices happen from the bottom, not the top, due to the
+// OpenGL coordinate system.
+
+#include <epoxy/gl.h>
+#include <string>
+
+#include "effect.h"
+
+namespace movit {
+
+class SliceEffect : public Effect {
+public:
+       SliceEffect();
+       virtual std::string effect_type_id() const { return "SliceEffect"; }
+       std::string output_fragment_shader();
+       virtual bool needs_texture_bounce() const { return true; }
+       virtual bool changes_output_size() const { return true; }
+       virtual void inform_input_size(unsigned input_num, unsigned width, unsigned height);
+       virtual void get_output_size(unsigned *width, unsigned *height,
+                                    unsigned *virtual_width, unsigned *virtual_height) const;
+
+       void set_gl_state(GLuint glsl_program_num, const std::string &prefix, unsigned *sampler_num);
+       
+       enum Direction { HORIZONTAL = 0, VERTICAL = 1 };
+
+private:
+       int input_width, input_height;
+       int input_slice_size, output_slice_size;
+       Direction direction;
+};
+
+}  // namespace movit
+
+#endif // !defined(_MOVIT_SLICE_EFFECT_H)