lavf: add transpose_opencl filter

Signed-off-by: Ruiling Song <ruiling.song@intel.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

libavfilter/opencl/transpose.cl

@@ -0,0 +1,35 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+kernel void transpose(__write_only image2d_t dst,
+                      __read_only image2d_t src,
+                      int dir) {
+    const sampler_t sampler = (CLK_NORMALIZED_COORDS_FALSE |
+                               CLK_ADDRESS_CLAMP_TO_EDGE   |
+                               CLK_FILTER_NEAREST);
+
+    int2 size = get_image_dim(dst);
+    int x = get_global_id(0);
+    int y = get_global_id(1);
+
+    int xin = (dir & 2) ? (size.y - 1 - y) : y;
+    int yin = (dir & 1) ? (size.x - 1 - x) : x;
+    float4 data = read_imagef(src, sampler, (int2)(xin, yin));
+
+    if (x < size.x && y < size.y)
+        write_imagef(dst, (int2)(x, y), data);
+}