Fading color override effect

Changing the delta from a gd script, allows the canvas item to completely display another color keeping the alpha of the base image and control it with a script.

Here’s the gdscript I use for my game in order to control the delta of the shader:

@tool
class_name OverrideColorActivator
extends Sprite2D

@export var activate: bool = false
@export var effect_duration: float = 0.2
var chrono: float = 0.;

func _process(delta):
	if activate == true:
		activate = false
		chrono = effect_duration
	if chrono >= 0:
		var shader_delta: float = chrono/effect_duration
		material.set_shader_parameter("blend_delta", shader_delta)
		chrono -= delta

Have fun!

Shader code

shader_type canvas_item;

uniform vec4 color_override: source_color;
uniform float blend_delta: hint_range(0., 1.0, 0.02) = 0.;

vec4 override_blend_alpha(vec4 base, vec4 blend)
{
	blend.a = base.a;
	return blend;
}

void fragment()
{
	vec4 texture_color = texture(TEXTURE, UV);
	vec4 blend_override = override_blend_alpha(texture_color, color_override);
	vec4 target_color = mix(texture_color, blend_override, blend_delta);
	COLOR = target_color;
}

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