godot-demo-projects/2d/screen_space_shaders/shaders/pixelize.gdshader

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shader_type canvas_item;
uniform sampler2D screen_texture : hint_screen_texture, filter_linear_mipmap;
uniform float size_x = 0.008;
uniform float size_y = 0.008;
void fragment() {
vec2 uv = SCREEN_UV;
uv -= mod(uv, vec2(size_x, size_y));
COLOR.rgb = textureLod(screen_texture, uv, 0.0).rgb;
}