Add Grayscale shader (#37)

linkedin · Jul 1, 2020 · 097165f · 097165f
1 parent 7383f85
commit 097165f
Showing 1 changed file with 17 additions and 0 deletions.
diff --git a/litr/src/main/java/com/linkedin/android/litr/shader/FragmentShaders.java b/litr/src/main/java/com/linkedin/android/litr/shader/FragmentShaders.java
@@ -0,0 +1,17 @@
+package com.linkedin.android.litr.shader;
+
+public class FragmentShaders {
+
+    public static final String GRAYSCALE_SHADER = "#extension GL_OES_EGL_image_external : require\n" +
+            "precision mediump float;\n" +
+            "varying vec2 vTextureCoord;\n" +
+            "uniform samplerExternalOES sTexture;\n" +
+            "const highp vec3 weight = vec3(0.2125, 0.7154, 0.0721);\n" +
+            "void main() {\n" +
+            "  float luminance = dot(texture2D(sTexture, vTextureCoord).rgb, weight);\n" +
+            "  gl_FragColor = vec4(vec3(luminance), 1.0);\n" +
+            "}\n";
+
+    private FragmentShaders() {
+    }
+}