#version 100
// Copyright 2022 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.

// ES 2 fragment shader that samples from a (non-external) texture with
// uTexSampler, copying from this texture to the current output while
// applying a 4x4 RGB color matrix to change the pixel colors.

precision mediump float;
uniform sampler2D uTexSampler;
uniform mat4 uRgbMatrix;
varying vec2 vTexSamplingCoord;

void main() {
  vec4 inputColor = texture2D(uTexSampler, vTexSamplingCoord);
  gl_FragColor = uRgbMatrix * vec4(inputColor.rgb, 1);
  gl_FragColor.a = inputColor.a;
}