color.hpp

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#pragma once
 
#include "system_state.hpp"
#include <cstdint>
 
namespace ogl {
 
// borrowed from http://www.burtleburtle.net/bob/hash/doobs.html
inline constexpr uint32_t color_from_hash(uint32_t color) {
    uint32_t m1 = 0x1337CAFE;
    uint32_t m2 = 0xDEADBEEF;
    m1 -= m2;
    m1 -= color;
    m1 ^= (color >> 13);
    m2 -= color;
    m2 -= m1;
    m2 ^= (m1 << 8);
    color -= m1;
    color -= m2;
    color ^= (m2 >> 13);
    m1 -= m2;
    m1 -= color;
    m1 ^= (color >> 12);
    m2 -= color;
    m2 -= m1;
    m2 ^= (m1 << 16);
    color -= m1;
    color -= m2;
    color ^= (m2 >> 5);
    m1 -= m2;
    m1 -= color;
    m1 ^= (color >> 3);
    m2 -= color;
    m2 -= m1;
    m2 ^= (m1 << 10);
    color -= m1;
    color -= m2;
    color ^= (m2 >> 15);
    return color;
}
 
inline uint32_t color_gradient(float percent, uint32_t top_color, uint32_t bot_color) {
    uint32_t color = 0;
    for(uint32_t i = 0; i <= 16; i += 8) {
        auto diff = int32_t(top_color >> i & 0xFF) - int32_t(bot_color >> i & 0xFF);
        color |= uint32_t(int32_t(bot_color >> i & 0xFF) + diff * percent) << i;
    }
    return color;
}
 
template<class T>
inline uint32_t get_ui_color(sys::state& state, T id) {
    return dcon::fatten(state.world, id).get_color();
}
template<>
inline uint32_t get_ui_color(sys::state& state, dcon::political_party_id id) {
    return dcon::fatten(state.world, id).get_ideology().get_color();
}
template<>
inline uint32_t get_ui_color(sys::state& state, dcon::issue_option_id id) {
    return ogl::color_from_hash(uint32_t(id.index()));
}
template<>
inline uint32_t get_ui_color(sys::state& state, dcon::crime_id id) {
    return ogl::color_from_hash(uint32_t(id.index()));
}
 
} // namespace ogl