Added OpenCL support to posterize

2 files changed, 58 insertions, 0 deletions

diff --git a/opencl/posterize.cl b/opencl/posterize.cl
new file mode 100644
index 00000000..5ba9e8b2
--- /dev/null
+++ b/opencl/posterize.cl
@@ -0,0 +1,28 @@
+/* This file is an image processing operation for GEGL
+ *
+ * GEGL 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 3 of the License, or (at your option) any later version.
+ *
+ * GEGL 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 GEGL; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2013 Carlos Zubieta <czubieta.dev@gmail.com>
+ */
+
+__kernel void cl_posterize(__global const float4 *in,
+                           __global       float4 *out,
+                                          float  levels)
+{
+  int gid     = get_global_id(0);
+  float4 in_v = in[gid];
+
+  in_v.xyz  = trunc(in_v.xyz * levels + (float3)(0.5f)) / levels;
+  out[gid]  = in_v;
+}
diff --git a/opencl/posterize.cl.h b/opencl/posterize.cl.h
new file mode 100644
index 00000000..e7717c59
--- /dev/null
+++ b/opencl/posterize.cl.h
@@ -0,0 +1,30 @@
+static const char* posterize_cl_source =
+"/* This file is an image processing operation for GEGL                        \n"
+" *                                                                            \n"
+" * GEGL is free software; you can redistribute it and/or                      \n"
+" * modify it under the terms of the GNU Lesser General Public                 \n"
+" * License as published by the Free Software Foundation; either               \n"
+" * version 3 of the License, or (at your option) any later version.           \n"
+" *                                                                            \n"
+" * GEGL is distributed in the hope that it will be useful,                    \n"
+" * but WITHOUT ANY WARRANTY; without even the implied warranty of             \n"
+" * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU          \n"
+" * Lesser General Public License for more details.                            \n"
+" *                                                                            \n"
+" * You should have received a copy of the GNU Lesser General Public           \n"
+" * License along with GEGL; if not, see <http://www.gnu.org/licenses/>.       \n"
+" *                                                                            \n"
+" * Copyright 2013 Carlos Zubieta <czubieta.dev@gmail.com>                     \n"
+" */                                                                           \n"
+"                                                                              \n"
+"__kernel void cl_posterize(__global const float4 *in,                         \n"
+"                           __global       float4 *out,                        \n"
+"                                          float  levels)                      \n"
+"{                                                                             \n"
+"  int gid     = get_global_id(0);                                             \n"
+"  float4 in_v = in[gid];                                                      \n"
+"                                                                              \n"
+"  in_v.xyz  = trunc(in_v.xyz * levels + (float3)(0.5f)) / levels;             \n"
+"  out[gid]  = in_v;                                                           \n"
+"}                                                                             \n"
+;