shader_type spatial;
render_mode blend_mix;

uniform float scroll_speed : hint_range(0, 2) = 0.08;
uniform float angle_degrees : hint_range(0, 360) = 45.0;
uniform float repeat_x : hint_range(1, 20) = 20;
uniform float repeat_y : hint_range(1, 20) = 12;
uniform float row_offset : hint_range(0, 1) = 1;
uniform sampler2D texture_to_scroll;

void fragment() {
 float angle_rad = radians(angle_degrees);

 vec2 direction = vec2(cos(angle_rad), sin(angle_rad));

 vec2 offset_uv = UV - (TIME * scroll_speed * direction);

 float offset = fract(floor(offset_uv.y * repeat_y) * 0.5) > 0.0 ? (row_offset * 0.324) : 0.0;

 offset_uv.x += offset;

 vec2 scaled_uv = vec2(fract(offset_uv.x * repeat_x), 
              fract(offset_uv.y * repeat_y));

 vec2 texelSize = vec2(1.0) / vec2(textureSize(texture_to_scroll, 0));
 //vec2 snappedUV = round(scaled_uv / texelSize) * texelSize;

 ALBEDO = texture(texture_to_scroll, offset_uv).rgb;
 ALPHA = texture(texture_to_scroll, offset_uv).a;
}