PVZ-alike Slot cooldown

Shoutout to swagboard for uploading the original Sprite progress bar shader. I used their code as a base and with ChatGPT’s help, I managed to make an alternate version of it.

Usage: 

• cooldown_bg : color overlay for top portion of the slot when it’s in cooldown
• bg_overlay_strength : mix factor for cooldown_bg with the base texture UV
• inactive_color : color overlay for bottom portion of the slot when it’s in cooldown
• overlay_strength : mix factor for inactive_color with the base texture UV
• active_color : color to overlay when the slot is selected
• active_overlay_strength : mix factor for active_color with the base texture UV
• progress : progress for the cooldown (1 = full, 0 = none i.e. no more cooldown)

Booleans (Important!):

You need to set the right booleans at the right time for the shader to work correctly!

• cooldown_bg_switch : must be true at first, and then must be set to false when the shader parameter “progress” is <= 0. And it should be set to true again when the slot is planted again and yeah you know the drill.
• is_active : set this to true when the slot is selected so that it will be highlighted.

I am not very good with naming things so I am sorry if the uniform names are confusing lol.
Feel free to change them in the shader editor.

Shader code

shader_type canvas_item;

uniform vec4 inactive_color : source_color = vec4(1.0, 1.0, 1.0, 1.0);
uniform vec4 cooldown_bg: source_color = vec4(1.0, 1.0, 1.0, 1.0);
uniform vec4 active_color : source_color = vec4(1.0, 0.0, 0.0, 1.0);
uniform float progress : hint_range(0.0, 1.0) = 0.0;
uniform float overlay_strength : hint_range(0.0, 1.0) = 0.0;
uniform float bg_overlay_strength : hint_range(0.0, 1.0) = 0.0;
uniform float active_overlay_strength : hint_range(0.0, 1.0) = 0.0;
uniform bool is_active = false;
uniform bool cooldown_bg_switch = true;

void fragment() {
    vec4 custom_color = texture(TEXTURE, UV);
	vec4 cooldown_bg_color = vec4(0,0,0,0);
	if ((1.0 - UV.y >= progress && custom_color.a != 0.0 && cooldown_bg_switch==true) || (is_active==false && cooldown_bg_switch==true)){
		cooldown_bg_color.rgb = mix(custom_color.rgb, cooldown_bg.rgb, bg_overlay_strength);
		cooldown_bg_color.a = COLOR.a;
		COLOR = cooldown_bg_color;
	}
    if (1.0 - UV.y <= progress && custom_color.a != 0.0 && is_active==false) {
        // Mix the overlay color with the original color using overlay_strength
        custom_color.rgb = mix(custom_color.rgb, inactive_color.rgb, overlay_strength);
        custom_color.a = COLOR.a;
        COLOR = custom_color;
    }
	if (custom_color.a != 0.0 && is_active==true)
	{
		custom_color.rgb = mix(custom_color.rgb, active_color.rgb, active_overlay_strength);
		custom_color.a = COLOR.a;
		custom_color.a = COLOR.a;
		COLOR = custom_color;
	}
}

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