[FFmpeg-devel] [PATCH v3 4/5] libavcodec/vulkan: Add modifications to common shader for VC2 vulkan encoder

[IndecisiveTurtle]

From: IndecisiveTurtle <geoste...@gmail.com>

---
 libavcodec/vulkan/common.comp | 54 ++++++++++++++++++++++++++++-------
 1 file changed, 44 insertions(+), 10 deletions(-)

diff --git a/libavcodec/vulkan/common.comp b/libavcodec/vulkan/common.comp
index 10af9c0623..db216a2ac6 100644
--- a/libavcodec/vulkan/common.comp
+++ b/libavcodec/vulkan/common.comp
@@ -18,6 +18,9 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#extension GL_EXT_buffer_reference : require
+#extension GL_EXT_buffer_reference2 : require
+
 layout(buffer_reference, buffer_reference_align = 1) buffer u8buf {
     uint8_t v;
 };
@@ -61,22 +64,20 @@ layout(buffer_reference, buffer_reference_align = 8) buffer 
u64buf {
 #define mid_pred(a, b, c) \
     max(min((a), (b)), min(max((a), (b)), (c)))
 
-/* TODO: optimize */
+
 uint align(uint src, uint a)
 {
-    uint res = src % a;
-    if (res == 0)
-        return src;
-    return src + a - res;
+    return (src + a - 1) & ~(a - 1);
+}
+
+int align(int src, int a)
+{
+    return (src + a - 1) & ~(a - 1);
 }
 
-/* TODO: optimize */
 uint64_t align64(uint64_t src, uint64_t a)
 {
-    uint64_t res = src % a;
-    if (res == 0)
-        return src;
-    return src + a - res;
+    return (src + a - 1) & ~(a - 1);
 }
 
 #define reverse4(src) \
@@ -167,6 +168,39 @@ uint32_t flush_put_bits(inout PutBitContext pb)
     return uint32_t(pb.buf - pb.buf_start);
 }
 
+void skip_put_bytes(inout PutBitContext pb, int n)
+{
+    int bytes_left = pb.bit_left >> 3;
+    if (n < bytes_left)
+    {
+        int n_bits = n << 3;
+        int mask = (1 << n_bits) - 1;
+        pb.bit_buf <<= n_bits;
+        pb.bit_buf |= mask;
+        pb.bit_left -= uint8_t(n_bits);
+        return;
+    }
+    if (pb.bit_left < BUF_BITS)
+    {
+        int mask = (1 << pb.bit_left) - 1;
+        pb.bit_buf <<= pb.bit_left;
+        pb.bit_buf |= mask;
+        u32vec2buf(pb.buf).v = BUF_REVERSE(pb.bit_buf);
+        pb.buf += BUF_BYTES;
+        n -= pb.bit_left >> 3;
+    }
+    int skip_dwords = n >> 2;
+    while (skip_dwords > 0)
+    {
+        u8vec4buf(pb.buf).v = u8vec4(0xFF);
+        pb.buf += 4;
+        skip_dwords--;
+    }
+    int skip_bits = (n & 3) << 3;
+    pb.bit_buf = (1 << skip_bits) - 1;
+    pb.bit_left = uint8_t(BUF_BITS - skip_bits);
+}
+
 void init_put_bits(out PutBitContext pb, u8buf data, uint64_t len)
 {
     pb.buf_start = uint64_t(data);
-- 
2.49.0

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