pixelated horror vignette dot-matrix downres

this is a post-processing shader that can be attached to a quad in front of the camera like explained here in the docs. This should also be easy to convert to a canvasitem shader if going that route. I’ll do it if someone asks…

I use this in compatibility, so should work anywhere.

The settings used in the screenshot:

  • Brightness: 0.26
  • Contrast: 3
  • Scale: 1
  • Rotation: 0.08
  • Resolution Downsampling: 4
Shader code
shader_type spatial;
render_mode unshaded, fog_disabled;

uniform vec3 luminance: source_color = vec3(0.3086, 0.6094, 0.0820);
uniform float brightness: hint_range(0.01, 20.0, .01) = 0.26;
uniform float contrast: hint_range(1.0, 4.0, .01) = 3.0;
uniform float scale: hint_range(0.1, 10.0, .01) = 1.0;
uniform float rotation: hint_range(0.00, 6.28, .01) = 0.08;
uniform float resolution_downsampling: hint_range(1.0, 8.0, 1.0) = 4.0;
uniform sampler2D screen_texture: hint_screen_texture, filter_nearest, repeat_disable;

mat2 rotate(float a) {
	float sa = sin(a);
	float ca = cos(a);
	return mat2(vec2(ca, sa), vec2(-sa, ca));
}

void vertex(){
	POSITION = vec4(VERTEX.xy, 1.0, 1.0);
}

float dot_matrix(vec2 uv) {
	vec2 rot_uv = rotate(rotation) * uv * scale;
	return sin(rot_uv.x) * sin(rot_uv.y);
}

void fragment() {
	vec2 UV_new = SCREEN_UV - mod(SCREEN_UV, 1.0/VIEWPORT_SIZE * resolution_downsampling);
	vec2 resolution = VIEWPORT_SIZE;
	vec3 color = texture(screen_texture, UV_new).rgb;
	float grey = dot(color, luminance) * contrast;
	color = vec3(grey + dot_matrix(UV * resolution));
	float vignette = smoothstep(0.45, 0.1, distance(UV, vec2(0.5))) * 1.0;
	
	float v_x = smoothstep(0.45, 0.1, distance(UV.x, 0.5));
	float v_y = smoothstep(0.45, 0.1, distance(UV.y, 0.5));
	
	ALBEDO = vec3(color * brightness) * vignette;
}
Tags
dot matrix, down-res, horror, Pixelated, vignette
The shader code and all code snippets in this post are under CC0 license and can be used freely without the author's permission. Images and videos, and assets depicted in those, do not fall under this license. For more info, see our License terms.

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wons
wons
15 days ago

Could you make it a canvas item shader?