Add example to show v4l2 buffer sharing with extension clGetMemObjectFdIntel.

This example captures yuy2 frame directly to cl buffer object by the way
of dma, processed by OpenCL kernel, then convert to nv12 format and
shown by libva.

v2:
Close cl buffer's fd by clCloseMemObjectFdIntel instead of close
function.
v3:
Just use close function, no need of clCloseMemObjectFdIntel.
v4:
Some modifcation of examples/CMakeLists.txt after code rebase.

Signed-off-by: Chuanbo Weng <chuanbo.weng@intel.com>
Reviewed-by: Yuan, Feng <feng.yuan@intel.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/kernels/runtime_yuy2_processing.cl b/kernels/runtime_yuy2_processing.cl
new file mode 100644
index 00000000..1478e656
--- /dev/null
+++ b/kernels/runtime_yuy2_processing.cl
@@ -0,0 +1,15 @@
+__kernel void
+runtime_yuy2_processing(__global uchar *src,
+                        int image_height,
+                        int image_pitch)
+{
+  int gx = get_global_id(0);
+  int gy = get_global_id(1);
+
+  int src_y = image_height / 2 + gy;
+  int mirror_y = image_height - src_y;
+
+  uchar4 mirror_val = *(__global uchar4*)(src + mirror_y*image_pitch + gx*4);
+  *(__global uchar4*)(src + src_y*image_pitch + gx*4) = mirror_val;
+
+}