ColorScheme.h

#pragma once
 
#include <Foundation/Math/Color.h>
 
class PL_FOUNDATION_DLL plColorScheme
{
public:
  enum Enum
  {
    Red,
    Pink,
    Grape,
    Violet,
    Indigo,
    Blue,
    Cyan,
    Teal,
    Green,
    Lime,
    Yellow,
    Orange,
    Gray,
    PlasmaBranding,
    Black,
    Count
  };
 
  constexpr static float s_fIndexNormalizer = 1.0f / (Count - 2);
 
  PL_FORCE_INLINE static plColor GetColor(Enum schemeColor, plUInt8 uiBrightness, float fSaturation = 1.0f, float fAlpha = 1.0f)
  {
    PL_ASSERT_DEV(uiBrightness <= 9, "Brightness is too large");
    const plColor c = s_Colors[schemeColor][uiBrightness];
    const float l = c.GetLuminance();
    return plMath::Lerp(plColor(l, l, l), c, fSaturation).WithAlpha(fAlpha);
  }
 
  static plColor GetColor(float fIndex, plUInt8 uiBrightness, float fSaturation = 1.0f, float fAlpha = 1.0f);
 
  PL_ALWAYS_INLINE static plColor DarkUI(Enum schemeColor)
  {
    return s_DarkUIColors[schemeColor];
  }
 
  PL_FORCE_INLINE static plColor DarkUI(float fIndex)
  {
    plUInt32 uiIndexA, uiIndexB;
    float fFrac;
    GetInterpolation(fIndex, uiIndexA, uiIndexB, fFrac);
 
    return plMath::Lerp(s_DarkUIColors[uiIndexA], s_DarkUIColors[uiIndexB], fFrac);
  }
 
  PL_ALWAYS_INLINE static plColor LightUI(Enum schemeColor)
  {
    return s_LightUIColors[schemeColor];
  }
 
  PL_FORCE_INLINE static plColor LightUI(float fIndex)
  {
    plUInt32 uiIndexA, uiIndexB;
    float fFrac;
    GetInterpolation(fIndex, uiIndexA, uiIndexB, fFrac);
 
    return plMath::Lerp(s_LightUIColors[uiIndexA], s_LightUIColors[uiIndexB], fFrac);
  }
 
  enum class CategoryColorUsage
  {
    ViewportIcon,    // shape icons in 3D viewport
    MenuEntryIcon,   // tint color for icons in a menu
    SceneTreeIcon,   // tint color for icons in a scene tree
    OverlayIcon,     // tint color for overlay icons on top of thumbnails (asset browser)
    BorderColor,     // color for a border frame around UI elements
    BorderIconColor, // color for icons embedded in a border frame
    AssetMenuIcon,   // tint color for icons in asset browser menus
  };
 
  using CategoryColorFunc = plColor (*)(plStringView sCategory, CategoryColorUsage usage);
 
  static CategoryColorFunc s_CategoryColorFunc;
 
  static plColor GetCategoryColor(plStringView sCategory, CategoryColorUsage usage);
 
private:
  PL_ALWAYS_INLINE constexpr static void GetInterpolation(float fIndex, plUInt32& out_uiIndexA, plUInt32& out_uiIndexB, float& out_fFrac)
  {
    fIndex = plMath::Saturate(fIndex);
 
    constexpr plUInt32 uiCountWithoutGray = Count - 1;
    constexpr plUInt32 uiMaxIndex = uiCountWithoutGray - 1;
    out_uiIndexA = plUInt32(fIndex * uiMaxIndex);
    out_uiIndexB = (out_uiIndexA + 1) % uiCountWithoutGray;
    out_fFrac = (fIndex * uiMaxIndex) - out_uiIndexA;
  }
 
  static plColor s_Colors[Count][10];
  static plColor s_DarkUIColors[Count];
  static plColor s_LightUIColors[Count];
};