Added util function for shaders

source/funkin/backend/shaders/FunkinShader.hx

@@ -438,29 +438,46 @@ uniform sampler2D bitmap;
 uniform bool hasTransform;
 uniform bool hasColorTransform;
 
-vec4 flixel_texture2D(sampler2D bitmap, vec2 coord)
-{
+vec4 flixel_texture2D(sampler2D bitmap, vec2 coord) {
 	vec4 color = texture2D(bitmap, coord);
-	if (!hasTransform)
-	{
+	if (!hasTransform) {
 		return color;
 	}
 
-	if (color.a == 0.0)
-	{
+	if (color.a == 0.0) {
 		return vec4(0.0, 0.0, 0.0, 0.0);
 	}
 
-	if (!hasColorTransform)
-	{
+	if (!hasColorTransform) {
 		return color * openfl_Alphav;
 	}
 
 	color = vec4(color.rgb / color.a, color.a);
 	color = clamp(openfl_ColorOffsetv + (color * openfl_ColorMultiplierv), 0.0, 1.0);
 
-	if (color.a > 0.0)
-	{
+	if (color.a > 0.0) {
+		return vec4(color.rgb * color.a * openfl_Alphav, color.a * openfl_Alphav);
+	}
+	return vec4(0.0, 0.0, 0.0, 0.0);
+}
+
+vec4 applyFlixelEffects(vec4 color) {
+	if (!hasTransform) {
+		return color;
+	}
+
+	if (color.a == 0.0) {
+		return vec4(0.0, 0.0, 0.0, 0.0);
+	}
+
+	if (!hasColorTransform) {
+		return color * openfl_Alphav;
+	}
+
+	color = vec4(color.rgb / color.a, color.a);
+	color = clamp(openfl_ColorOffsetv + (color * openfl_ColorMultiplierv), 0.0, 1.0);
+
+	if (color.a > 0.0) {
 		return vec4(color.rgb * color.a * openfl_Alphav, color.a * openfl_Alphav);
 	}
 	return vec4(0.0, 0.0, 0.0, 0.0);