Putting it all together and testing it.

assets/shaders/textured.frag

@@ -8,6 +8,5 @@ out vec4 FragColor;
 
 void main() {
   vec4 color = texture(u_Text, TexCoord);
-  FragColor = color + vec4(0.25, 0.25, 0.25, 1);
-  // FragColor = vec4(1, 0, 0, 1);
+  FragColor = color + vec4(0.1, 0.1, 0.1, 1);
 }