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/*
* Copyright (C) 2014 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma version(1)
#pragma rs java_package_name(com.android.rs.cppbasic)
#pragma rs_fp_relaxed
const static float3 gMonoMult = {0.299f, 0.587f, 0.114f};
// global variables (parameters accessible to application code)
float gSaturation = 1.0f;
void root(const uchar4 *v_in, uchar4 *v_out) {
v_out->x = v_in->x; // don't modify A
// get RGB, scale 0-255 uchar to 0-1.0 float
float3 rgb = {v_in->y * 0.003921569f, v_in->z * 0.003921569f,
v_in->w * 0.003921569f};
// apply saturation filter
float3 result = dot(rgb, gMonoMult);
result = mix(result, rgb, gSaturation);
v_out->y = (uchar)clamp((result.r * 255.f + 0.5f), 0.f, 255.f);
v_out->z = (uchar)clamp((result.g * 255.f + 0.5f), 0.f, 255.f);
v_out->w = (uchar)clamp((result.b * 255.f + 0.5f), 0.f, 255.f);
}
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