Well, I had a free moment and I like messing with shaders, even if I'm not the best at it by any means... :sunglasses:
Here is the shader and controller script updated to work with Godot 3.0. Hopefully it helps.
Shader:
shader_type canvas_item;
uniform vec2 mouse_pos = vec2(0.0, 0.0);
uniform float aspect_ratios = 1.0;
vec2 zoom_point(vec2 uv, vec2 point, float zoom)
{
return (uv - point) / zoom + point;
}
void fragment()
{
vec2 uv = SCREEN_UV;
float lens_radius = 0.08;
float mouse_dist = distance(uv*vec2(1.0, aspect_ratios), mouse_pos*vec2(1.0, aspect_ratios));
if (mouse_dist < lens_radius)
{
float zoom = 2.0;
vec2 zoomed = zoom_point(uv, mouse_pos, zoom);
COLOR = vec4(texture(SCREEN_TEXTURE, zoomed).rgb, 1.0);
}
else if (mouse_dist < lens_radius + 0.004)
{
COLOR = vec4(0.0, 0.0, 0.0, 1.0);
}
else
{
discard;
//COLOR = vec4(0.0, 0.0, 0.0, 0.35);
//COLOR = vec4(textureLod(SCREEN_TEXTURE, uv, 2).rgb, 1.0);
}
}
Controller script:
extends TextureRect
var shader_material;
var screen_size;
func _ready():
screen_size = OS.window_size;
shader_material = material;
shader_material.set_shader_param("aspect_ratios", screen_size.y / screen_size.x);
func _input(event):
if (event is InputEventMouseMotion):
var norm_mouse = get_viewport().get_mouse_position() / screen_size;
norm_mouse.y = 1.0 - norm_mouse.y;
shader_material.set_shader_param("mouse_pos", norm_mouse);
update();
