Glitch Double Vision
A screen/canvas shader that combines a retro pixelated VHS glitch effect with a 3D anaglyph (red/blue) double vision effect.
Perfect for horror games, cyberpunk aesthetics, simulation glitches, or main character dizziness/hallucination effects.
Features:
- Pixel Size Grid Snapping: Gives a chunky, low-res retro look.
- Stepped Horizontal Glitch: A random, chunky VHS distortion that updates over time.
- Anaglyph Double Vision: Splits the screen into red and cyan/blue channels with an adjustable offset slider to simulate stereoscopic 3D or double vision.
- Fully Customizable: Easily tweak pixel size, glitch intensity, opacity, and the split distance directly from the inspector.
Shader code
shader_type canvas_item;
uniform sampler2D SCREEN_TEXTURE : hint_screen_texture, filter_nearest;
uniform float pixel_size : hint_range(1.0, 10.0) = 3.0;
uniform float vhs_intensity : hint_range(0.0, 10.0) = 3.0;
uniform float opacity : hint_range(0.0, 1.0) = 0.5;
uniform float double_vision_split : hint_range(0.0, 0.05) = 0.01;
float random(vec2 uv) {
return fract(sin(dot(uv, vec2(12.9898, 78.233))) * 43758.5453123);
}
void fragment() {
vec4 original_color = texture(SCREEN_TEXTURE, SCREEN_UV);
vec2 screen_res = vec2(textureSize(SCREEN_TEXTURE, 0));
vec2 grid_uv = round(SCREEN_UV * (screen_res / pixel_size)) / (screen_res / pixel_size);
float time_step = floor(TIME * 15.0);
float glitch = (random(vec2(time_step, floor(grid_uv.y * 30.0))) - 0.5) * 0.005 * vhs_intensity;
vec2 uv = grid_uv;
uv.x += glitch;
vec2 uv_red = uv + vec2(double_vision_split, 0.0);
vec2 uv_blue = uv - vec2(double_vision_split, 0.0);
vec4 tex_red = texture(SCREEN_TEXTURE, uv_red);
vec4 tex_blue = texture(SCREEN_TEXTURE, uv_blue);
vec3 red_vision = vec3(tex_red.r, 0.0, 0.0);
vec3 blue_vision = vec3(0.0, tex_blue.g, tex_blue.b);
vec3 vhs_color = red_vision + blue_vision;
vec3 final_color = mix(original_color.rgb, vhs_color, opacity);
COLOR = vec4(final_color, 1.0);
}