[gegl] hue-chroma: add opencl support

[Thomas Manni <tmanni src gnome org>]

commit 246e1faa541e212063b4f629febe97d010683a3d
Author: Thomas Manni <thomas manni free fr>
Date:   Thu Sep 21 11:11:38 2017 +0200

    hue-chroma: add opencl support

 opencl/hue-chroma.cl           |   15 +++++++++++++++
 opencl/hue-chroma.cl.h         |   17 +++++++++++++++++
 operations/common/hue-chroma.c |    3 +++
 3 files changed, 35 insertions(+), 0 deletions(-)
---
diff --git a/opencl/hue-chroma.cl b/opencl/hue-chroma.cl
new file mode 100644
index 0000000..07e6261
--- /dev/null
+++ b/opencl/hue-chroma.cl
@@ -0,0 +1,15 @@
+__kernel void gegl_hue_chroma (__global const float4 *in,
+                               __global       float4 *out,
+                                              float   hue,
+                                              float   chroma,
+                                              float   lightness)
+{
+  int gid = get_global_id(0);
+  float4 in_v  = in [gid];
+  float4 out_v;
+  out_v.x = in_v.x + lightness;
+  out_v.y = clamp(in_v.y + chroma, 0.f, 200.f);
+  out_v.z = in_v.z + hue;
+  out_v.w = in_v.w;
+  out[gid]  =  out_v;
+}
diff --git a/opencl/hue-chroma.cl.h b/opencl/hue-chroma.cl.h
new file mode 100644
index 0000000..95e3cfe
--- /dev/null
+++ b/opencl/hue-chroma.cl.h
@@ -0,0 +1,17 @@
+static const char* hue_chroma_cl_source =
+"__kernel void gegl_hue_chroma (__global const float4 *in,                     \n"
+"                               __global       float4 *out,                    \n"
+"                                              float   hue,                    \n"
+"                                              float   chroma,                 \n"
+"                                              float   lightness)              \n"
+"{                                                                             \n"
+"  int gid = get_global_id(0);                                                 \n"
+"  float4 in_v  = in [gid];                                                    \n"
+"  float4 out_v;                                                               \n"
+"  out_v.x = in_v.x + lightness;                                               \n"
+"  out_v.y = clamp(in_v.y + chroma, 0.f, 200.f);                               \n"
+"  out_v.z = in_v.z + hue;                                                     \n"
+"  out_v.w = in_v.w;                                                           \n"
+"  out[gid]  =  out_v;                                                         \n"
+"}                                                                             \n"
+;
diff --git a/operations/common/hue-chroma.c b/operations/common/hue-chroma.c
index b6712ec..2e06cae 100644
--- a/operations/common/hue-chroma.c
+++ b/operations/common/hue-chroma.c
@@ -91,6 +91,8 @@ process (GeglOperation       *op,
   return TRUE;
 }
 
+#include "opencl/hue-chroma.cl.h"
+
 static void
 gegl_op_class_init (GeglOpClass *klass)
 {
@@ -107,6 +109,7 @@ gegl_op_class_init (GeglOpClass *klass)
       "name",       "gegl:hue-chroma",
       "title",      _("Hue-Chroma"),
       "categories", "color",
+      "cl-source",   hue_chroma_cl_source,
       "description", _("Adjust LCH Hue, Chroma, and Lightness"),
       NULL);
 }