1/*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#pragma version(1)
18#pragma rs java_package_name(com.example.android.basicrenderscript)
19#pragma rs_fp_relaxed
20
21const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
22
23float saturationValue = 0.f;
24
25/*
26RenderScript kernel that performs saturation manipulation.
27*/
28uchar4 __attribute__((kernel)) saturation(uchar4 in)
29{
30    float4 f4 = rsUnpackColor8888(in);
31    float3 result = dot(f4.rgb, gMonoMult);
32    result = mix( result, f4.rgb, saturationValue );
33
34    return rsPackColorTo8888(result);
35}
36
37