supply.hpp

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#pragma once
 
std::vector<uint32_t> supply_map_from(sys::state& state) {
    uint32_t province_size = state.world.province_size();
    uint32_t texture_size = province_size + 256 - province_size % 256;
 
    std::vector<uint32_t> prov_color(texture_size * 2);
 
    state.world.for_each_province([&](dcon::province_id prov_id) {
        auto fat_id = dcon::fatten(state.world, prov_id);
        auto nation = fat_id.get_nation_from_province_ownership();
        int32_t supply_limit = military::supply_limit_in_province(state, nation, prov_id);
        float interpolation = (supply_limit < 50 ? supply_limit : 50) / 50.f;
 
        uint32_t color = ogl::color_gradient(interpolation, sys::pack_color(46, 247, 15), // red
                sys::pack_color(247, 15, 15)                                                                                                    // green
        );
 
        auto i = province::to_map_id(prov_id);
 
        prov_color[i] = color;
        prov_color[i + texture_size] = color;
    });
    return prov_color;
}