package com.daasuu.camerarecorder.egl.filter;
import android.opengl.GLES20;
/**
* Created by sudamasayuki on 2017/05/18.
*/
public class GlMonochromeFilter extends GlFilter {
private static final String FRAGMENT_SHADER =
"precision lowp float;" +
"varying highp vec2 vTextureCoord;" +
"uniform lowp sampler2D sTexture;" +
"uniform float intensity;" +
"uniform vec3 filterColor;" +
"const mediump vec3 luminanceWeighting = vec3(0.2125, 0.7154, 0.0721);" +
"void main() {" +
"lowp vec4 textureColor = texture2D(sTexture, vTextureCoord);" +
"float luminance = dot(textureColor.rgb, luminanceWeighting);" +
"lowp vec4 desat = vec4(vec3(luminance), 1.0);" +
"lowp vec4 outputColor = vec4(" +
"(desat.r < 0.5 ? (2.0 * desat.r * filterColor.r) : (1.0 - 2.0 * (1.0 - desat.r) * (1.0 - filterColor.r)))," +
"(desat.g < 0.5 ? (2.0 * desat.g * filterColor.g) : (1.0 - 2.0 * (1.0 - desat.g) * (1.0 - filterColor.g)))," +
"(desat.b < 0.5 ? (2.0 * desat.b * filterColor.b) : (1.0 - 2.0 * (1.0 - desat.b) * (1.0 - filterColor.b)))," +
"1.0" +
");" +
"gl_FragColor = vec4(mix(textureColor.rgb, outputColor.rgb, intensity), textureColor.a);" +
"}";
private float intensity = 1.0f;
private float[] filterColor = new float[]{0.6f, 0.45f, 0.3f};
public GlMonochromeFilter() {
super(DEFAULT_VERTEX_SHADER, FRAGMENT_SHADER);
}
public float getIntensity() {
return intensity;
}
public void setIntensity(float intensity) {
this.intensity = intensity;
}
@Override
public void onDraw() {
GLES20.glUniform1f(getHandle("intensity"), intensity);
GLES20.glUniform3fv(getHandle("filterColor"), 0, filterColor, 0);
}
}
