1 files changed, 12 insertions, 0 deletions
diff --git a/pacc/glsl/key.frag b/pacc/glsl/key.frag
new file mode 100644
index 0000000..d6bf7e1
--- /dev/null
+++ b/pacc/glsl/key.frag
@@ -0,0 +1,12 @@
+uniform sampler2D palette;
+uniform sampler2D tex;
+varying mediump vec2 texcoord;
+uniform lowp float key;
+uniform lowp float color;
+void main(void) {
+  lowp float index = texture2D(tex, texcoord).x;
+  if (index < (key + (0.5/255.0)) || (key + (1.5/255.0)) < index) {
+    discard;
+  }
+  gl_FragColor = texture2D(palette, vec2(color, 0.0));
+}