From d70ba6a970850285721871c7c10da8983877125e Mon Sep 17 00:00:00 2001
From: Martin Vignali <martin.vignali@gmail.com>
Date: Sat, 23 Sep 2017 23:31:05 +0200
Subject: [PATCH 4/5] libavcodec/texturedspenc : add rgtc1u encoding

---
 libavcodec/texturedspenc.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/libavcodec/texturedspenc.c b/libavcodec/texturedspenc.c
index 8b2863033b..11a32c6946 100644
--- a/libavcodec/texturedspenc.c
+++ b/libavcodec/texturedspenc.c
@@ -647,9 +647,26 @@ static int dxt5ys_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
     return 16;
 }
 
+/**
+ * Compress one block of RGBA pixels in a RGTC1U texture and store the
+ * resulting bytes in 'dst'. Alpha is preserved.
+ *
+ * @param dst    output buffer.
+ * @param stride scanline in bytes.
+ * @param block  block to compress.
+ * @return how much texture data has been written.
+ */
+static int rgtc1u_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
+{
+    compress_alpha(dst, stride, block);
+
+    return 8;
+}
+
 av_cold void ff_texturedspenc_init(TextureDSPContext *c)
 {
     c->dxt1_block   = dxt1_block;
     c->dxt5_block   = dxt5_block;
     c->dxt5ys_block = dxt5ys_block;
+    c->rgtc1u_block = rgtc1u_block;
 }
-- 
2.11.0 (Apple Git-81)