game/src/Game/Model/flag.gdshader


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shader_type spatial;

render_mode cull_disabled;

// Both vanilla flags use the same normal texture
uniform uvec2 flag_dims;
uniform sampler2D texture_flag_sheet_diffuse : source_color;
uniform sampler2D texture_normal : hint_normal;

instance uniform uint flag_index;

const float normal_scroll_speed = 0.3;

// Scroll the Normal map, but leave the albedo alone
void fragment() {
   uvec2 flag_sheet_dims = uvec2(textureSize(texture_flag_sheet_diffuse, 0));
   uint scaled_index = flag_index * flag_dims.x;

   uvec2 flag_pos = uvec2(scaled_index % flag_sheet_dims.x, scaled_index / flag_sheet_dims.x * flag_dims.y);

   vec2 flag_uv = (vec2(flag_pos) + UV * vec2(flag_dims)) / vec2(flag_sheet_dims);

   ALBEDO = texture(texture_flag_sheet_diffuse, flag_uv).rgb;

   vec2 normal_uv = UV;
   normal_uv.x -= TIME * normal_scroll_speed;

   NORMAL_MAP = texture(texture_normal, normal_uv).rgb;
}