bind any number of textures (i'm unstoppable)

shaders/frag0.glsl

@@ -22,6 +22,7 @@ uniform sampler2D tex4;
 uniform sampler2D tex5;
 uniform sampler2D tex6;
 uniform sampler2D tex7;
+uniform sampler2D tex8;
 
 // 3. definitions
 // --------------