Meter
Configurable meter.
9-7-2023: I have updated the shader to version 2. It has been changed slightly to work with Godot 4 by default but there are comments explaining how to use it with earlier versions of Godot.
15-1-2023: I have optimised the code by removing explicit if statements. I used some of the code snippets provided by nonunknown here: https://godotshaders.com/shader/optimize-your-shaders/
Shader code
// Meter shader v2 by Brian Smith (steampunkdemon.itch.io)
// MIT Licence
shader_type canvas_item;
// Replace the below references to source_color with hint_color if you are using a version of Godot before 4.
uniform vec4 indictor_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
uniform vec4 border_color : source_color = vec4(0.5, 0.5, 0.5, 1.0);
uniform vec4 centre_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
uniform vec4 region1_color : source_color = vec4(0.0, 1.0, 0.0, 1.0);
uniform vec4 region2_color : source_color = vec4(1.0, 1.0, 0.0, 1.0);
uniform vec4 region3_color : source_color = vec4(1.0, 0.0, 0.0, 1.0);
uniform vec4 scale_mark_color : source_color = vec4(0.0, 0.0, 0.0, 1.0);
uniform bool show_edges = false;
uniform bool bottom_border = true;
uniform float meter_start_angle : hint_range(0.0, 0.4) = 0.15;
uniform float indicator_angle : hint_range(0.0, 1.0) = 0.0;
uniform float indicator_length : hint_range(0.1, 1.0) = 0.6;
uniform float indicator_width : hint_range(0.001, 0.02) = 0.01;
uniform float border_width : hint_range(0.0, 0.5) = 0.05;
uniform float centre_width : hint_range(0.0, 0.5) = 0.1;
uniform float region1 : hint_range(0.0, 1.0) = 0.5;
uniform float region2 : hint_range(0.0, 1.0) = 0.75;
uniform float region3 : hint_range(0.0, 1.0) = 0.9;
uniform float regions_end : hint_range(0.0, 1.0) = 1.0;
uniform float scale_marks : hint_range(0.0, 20.0, 1.0) = 10.0;
uniform float major_scale_marks : hint_range(0.0, 20.0, 1.0) = 2.0;
uniform float scale_mark_width : hint_range(0.01, 0.05) = 0.03;
uniform float scale_minor_outer : hint_range(0.0, 1.0) = 0.75;
uniform float scale_major_outer : hint_range(0.0, 1.0) = 0.80;
uniform float scale_inner : hint_range(0.0, 1.0) = 0.65;
float greater_than(float x, float y) {
return max(sign(x - y), 0.0);
}
void fragment() {
vec2 uv = UV;
uv.x = uv.x * 2.0 - 1.0;
// If you do not want to render the border replace the following line of code with:
// uv.y = uv.y - 1.0;
uv.y = uv.y * (1.0 + border_width * float(bottom_border)) - 1.0;
float scale_factor = 1.0 - meter_start_angle * 2.0;
float adjusted_scale_mark_width = scale_mark_width / scale_factor;
float a = ((atan(uv.y, uv.x) + 3.141592656) / 3.141592656 - meter_start_angle) / scale_factor;
float l = length(uv);
// Uncomment the following line if you are applying the shader to a TextureRect and using a version of Godot before 4.
// COLOR = texture(TEXTURE,UV);
// If you do not want to render all the colored regions remove the appropriate lines from the following block of code.
COLOR.rgb = mix(COLOR.rgb, region3_color.rgb, region3_color.a * (greater_than(a, region3) * greater_than(regions_end, a)));
COLOR.rgb = mix(COLOR.rgb, region2_color.rgb, region2_color.a * (greater_than(a, region2) * greater_than(region3, a)));
COLOR.rgb = mix(COLOR.rgb, region1_color.rgb, region1_color.a * (greater_than(a, region1) * greater_than(region2, a)));
// If you do not want to render the scale marks remove the following code block.
// If you do not want to render the major scale marks remove the second following line.
COLOR.rgb = mix(COLOR.rgb, scale_mark_color.rgb, scale_mark_color.a * greater_than(a, 0.0 - scale_mark_width) * greater_than(1.0 + scale_mark_width, a) * greater_than(abs(mod(a, 1.0 / scale_marks) * scale_marks * 2.0 - 1.0), 1.0 - (adjusted_scale_mark_width / 6.283185312 / l) * scale_marks) * (greater_than(scale_minor_outer, l) * greater_than(l, scale_inner)));
COLOR.rgb = mix(COLOR.rgb, scale_mark_color.rgb, scale_mark_color.a * greater_than(a, 0.0 - scale_mark_width) * greater_than(1.0 + scale_mark_width, a) * greater_than(abs(mod(a, 1.0 / major_scale_marks) * major_scale_marks * 2.0 - 1.0), 1.0 - (adjusted_scale_mark_width / 6.283185312 / l) * major_scale_marks) * (greater_than(scale_major_outer, l) * greater_than(l, scale_minor_outer)));
COLOR.rgb = mix(COLOR.rgb, indictor_color.rgb, indictor_color.a * greater_than(indicator_length, l) * greater_than(indicator_width / scale_factor / l, abs(indicator_angle - a)));
// If you do not want to render the centre remove the following line.
COLOR.rgb = mix(COLOR.rgb, centre_color.rgb, centre_color.a * greater_than(centre_width, l));
// If you do not want to render the border remove the following line.
COLOR.rgb = mix(COLOR.rgb, border_color.rgb, border_color.a * min(greater_than(l, 1.0 - border_width) + greater_than(uv.y, 0.0), 1.0));
// If you do not want the edges to be transparent remove the following line of code.
// If you always want the edges to be transparent replace the following line of code with:
// COLOR.a *= greater_than(1.0, l);
COLOR.a *= max(sign(1.0 - l), float(show_edges));
}
