1 files changed, 20 insertions, 0 deletions
diff --git a/shaders/gles100/grayscale.fs b/shaders/gles100/grayscale.fs
new file mode 100644
index 00000000..07e79614
--- /dev/null
+++ b/shaders/gles100/grayscale.fs
@@ -0,0 +1,20 @@
+#version 100
+
+precision mediump float;
+
+varying vec2 fragTexCoord;
+
+uniform sampler2D texture0;
+uniform vec4 tintColor;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    vec4 base = texture2D(texture0, fragTexCoord)*tintColor;
+    
+    // Convert to grayscale using NTSC conversion weights
+    float gray = dot(base.rgb, vec3(0.299, 0.587, 0.114));
+    
+    gl_FragColor = vec4(gray, gray, gray, tintColor.a);
+}
+\ No newline at end of file