opengl.texturing: Update shader 'frag.snippet' to allow models with multiple textures to selectively apply/unapply individual textures.

3-mid/opengl/assets/shader/texturing-frag.snippet

@@ -1,13 +1,18 @@
 uniform int         texture_Count;
 uniform sampler2D   Textures        [16];
 uniform float       Fade            [16];
+uniform bool        texture_Applies [16];
+
 
 vec4
 apply_Texturing (vec2   Coords)
 {
     vec4   Color = vec4 (0);
 
+
     for (int i = 0;   i < texture_Count;   ++i)
+    {
+        if (texture_Applies [i])
         {
             Color.rgb +=   texture (Textures [i], Coords).rgb
                          * texture (Textures [i], Coords).a
@@ -21,6 +26,8 @@ apply_Texturing (vec2   Coords)
 //            Color.a    = max (Color.a,
 //                              texture (Textures [i],Coords).a);
         }
+    }
+    
     
     return Color;
 }