lavfi: add colorkey_opencl filter

This is a direct port of the CPU filter.

Signed-off-by: Jarek Samic <cldfire3@gmail.com>
Signed-off-by: Mark Thompson <sw@jkqxz.net>

1 files changed, 49 insertions, 0 deletions

diff --git a/libavfilter/opencl/colorkey.cl b/libavfilter/opencl/colorkey.cl
new file mode 100644
index 0000000..6d71f17
--- /dev/null
+++ b/libavfilter/opencl/colorkey.cl
@@ -0,0 +1,49 @@
+/*
+ * 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
+ */
+
+const sampler_t sampler = CLK_NORMALIZED_COORDS_FALSE |
+                          CLK_FILTER_NEAREST;
+
+__kernel void colorkey_blend(
+    __read_only  image2d_t src,
+    __write_only image2d_t dst,
+    float4 colorkey_rgba,
+    float similarity,
+    float blend
+) {
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+    float4 pixel = read_imagef(src, sampler, loc);
+    float diff = distance(pixel.xyz, colorkey_rgba.xyz);
+
+    pixel.s3 = clamp((diff - similarity) / blend, 0.0f, 1.0f);
+    write_imagef(dst, loc, pixel);
+}
+
+__kernel void colorkey(
+    __read_only  image2d_t src,
+    __write_only image2d_t dst,
+    float4 colorkey_rgba,
+    float similarity
+) {
+    int2 loc = (int2)(get_global_id(0), get_global_id(1));
+    float4 pixel = read_imagef(src, sampler, loc);
+    float diff = distance(pixel.xyz, colorkey_rgba.xyz);
+
+    pixel.s3 = (diff > similarity) ? 1.0f : 0.0f;
+    write_imagef(dst, loc, pixel);
+}