From 58995af52683990d223e5880bafcad08444acfb1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Cl=C3=A9ment=20Le=20Bihan?= <clement.lebihan773@gmail.com>
Date: Wed, 16 Jun 2021 16:24:49 +0200
Subject: [PATCH] adding alpha shader (it's not used)

---
 assets/shaders/alpha.fs | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)
 create mode 100644 assets/shaders/alpha.fs

diff --git a/assets/shaders/alpha.fs b/assets/shaders/alpha.fs
new file mode 100644
index 00000000..85f2c56c
--- /dev/null
+++ b/assets/shaders/alpha.fs
@@ -0,0 +1,28 @@
+#version 330
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+uniform float alpha;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Texel color fetching from texture sampler
+    vec4 texelColor = texture2D(texture0, fragTexCoord);
+
+    // Convert texel color to grayscale using NTSC conversion weights
+
+    texelColor.a = alpha;
+
+    gl_FragColor = texelColor;
+    // Calculate final fragment color
+    //gl_FragColor = vec4(gray, gray, gray, texelColor.a);
+}
\ No newline at end of file