X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=futatabi%2Fchroma_subsampler.h;fp=futatabi%2Fchroma_subsampler.h;h=ec43fe084627f3532da549fb1411051081ecc0ab;hb=6e116a6bbeb2c047a3bfb084395ec601ce211e6c;hp=0000000000000000000000000000000000000000;hpb=ce2e0615420b706e1ff2405fffcedfba37a9adac;p=nageru

diff --git a/futatabi/chroma_subsampler.h b/futatabi/chroma_subsampler.h
new file mode 100644
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+++ b/futatabi/chroma_subsampler.h
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+#ifndef _CHROMA_SUBSAMPLER_H
+#define _CHROMA_SUBSAMPLER_H 1
+
+#include "flow.h"
+
+#include <epoxy/gl.h>
+
+class ChromaSubsampler {
+public:
+	ChromaSubsampler();
+	~ChromaSubsampler();
+
+	// Subsamples chroma (packed Cb and Cr) 2x1 to yield chroma suitable for
+	// planar 4:2:2. Chroma positioning is left (H.264 convention).
+	// width and height are the dimensions (in pixels) of the input texture.
+	void subsample_chroma(GLuint cbcr_tex, unsigned width, unsigned height, GLuint cb_tex, GLuint cr_tex);
+
+private:
+	PersistentFBOSet<2> fbos;
+
+	GLuint vao;
+	GLuint vbo;  // Holds position data.
+
+	GLuint cbcr_vs_obj, cbcr_fs_obj, cbcr_program;
+	GLuint uniform_cbcr_tex;
+	GLuint uniform_chroma_offset_0, uniform_chroma_offset_1;
+};
+
+#endif  // !defined(_CHROMA_SUBSAMPLER_H)