Updated shaders with comments

shaders/glsl330/template.fs

@@ -1,19 +1,24 @@
 #version 330
 
+// Input vertex attributes (from vertex shader)
 in vec2 fragTexCoord;
+in vec4 fragColor;
 
-out vec4 fragColor;
-
+// Input uniform values
 uniform sampler2D texture0;
 uniform vec4 fragTintColor;
 
+// Output fragment color
+out vec4 finalColor;
+
 // NOTE: Add here your custom variables
 
 void main()
 {
+    // Texel color fetching from texture sampler
     vec4 texelColor = texture(texture0, fragTexCoord);
     
     // NOTE: Implement here your fragment shader code
     
-    fragColor = texelColor*fragTintColor;
+    finalColor = texelColor*fragTintColor;
 }