First adjustments to the Entity System to make it work with different types

shader/HSV.gdshader

@@ -12,6 +12,9 @@ uniform float brightness_add  : hint_range(-1.0, 1.0) = 0.0;
 // Contrast multiplier in RGB space. 1.0 means no change.
 uniform float contrast_mult   : hint_range(0.0, 2.0) = 1.0;
 
+//Cached Color value to reapply modulate
+varying vec4 modulate;
+
 // Converts an RGB color to HSV.
 vec3 rgb2hsv(vec3 c) {
     float cMax = max(max(c.r, c.g), c.b);
@@ -65,6 +68,10 @@ vec3 hsv2rgb(vec3 c) {
     return rgb + vec3(m);
 }
 
+void vertex(){
+	modulate = COLOR;
+}
+
 void fragment() {
     // Get the original texture color.
     vec4 tex_color = texture(TEXTURE, UV);
@@ -89,4 +96,6 @@ void fragment() {
 
     // Output the final color while preserving the original alpha.
     COLOR = vec4(col, tex_color.a);
+	//reapply vertex color value to keep modulate changes
+	COLOR = COLOR * modulate;
 }