Inventory management focused game written in Godot / C#
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// Adapted from Leafshade Interactive's outline shader
// explained and shown in https://youtu.be/yh1Kdr37RmI.
shader_type canvas_item;
uniform vec4 line_color : source_color = vec4(1.0);
uniform float line_thickness : hint_range(0.0, 10.0) = 2.0;
void fragment() {
vec2 size = TEXTURE_PIXEL_SIZE * line_thickness;
float outline =
texture(TEXTURE, UV + vec2( size.x, 0)).a +
texture(TEXTURE, UV + vec2(-size.x, 0)).a +
texture(TEXTURE, UV + vec2(0, size.y)).a +
texture(TEXTURE, UV + vec2(0, -size.y)).a +
texture(TEXTURE, UV + vec2( size.x, size.y)).a +
texture(TEXTURE, UV + vec2(-size.x, size.y)).a +
texture(TEXTURE, UV + vec2(-size.x, -size.y)).a +
texture(TEXTURE, UV + vec2( size.x, -size.y)).a;
float alpha = min(outline, 1.0) - texture(TEXTURE, UV).a;
COLOR = vec4(line_color.rgb, line_color.a * alpha);
}