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#pragma once
#include "Utils.hpp"
#include <algorithm>
#include <cstdint>
#include <glm/glm.hpp>
#include <limits>
class HsvColor;
class RgbaColor {
public:
uint8_t r;
uint8_t g;
uint8_t b;
uint8_t a;
public:
constexpr RgbaColor() noexcept
: r{ 255 }
, g{ 255 }
, b{ 255 }
, a{ 255 } {
}
constexpr RgbaColor(float r, float g, float b, float a = 1.0f) noexcept
: r{ static_cast<uint8_t>(r * 255.0f) }
, g{ static_cast<uint8_t>(g * 255.0f) }
, b{ static_cast<uint8_t>(b * 255.0f) }
, a{ static_cast<uint8_t>(a * 255.0f) } {
}
constexpr RgbaColor(int r, int g, int b, int a = 255) noexcept
: r{ static_cast<uint8_t>(r & 0xFF) }
, g{ static_cast<uint8_t>(g & 0xFF) }
, b{ static_cast<uint8_t>(b & 0xFF) }
, a{ static_cast<uint8_t>(a & 0xFF) } {
}
constexpr RgbaColor(uint32_t rgba) noexcept
: r{ static_cast<uint8_t>((rgba >> 0) & 0xFF) }
, g{ static_cast<uint8_t>((rgba >> 8) & 0xFF) }
, b{ static_cast<uint8_t>((rgba >> 16) & 0xFF) }
, a{ static_cast<uint8_t>((rgba >> 24) & 0xFF) } {
}
constexpr uint32_t GetScalar() const noexcept {
uint32_t res = 0;
res |= r << 0;
res |= g << 8;
res |= b << 16;
res |= a << 24;
return res;
}
constexpr void SetScalar(uint32_t scalar) noexcept {
r = (scalar >> 0) & 0xFF;
g = (scalar >> 8) & 0xFF;
b = (scalar >> 16) & 0xFF;
a = (scalar >> 24) & 0xFF;
}
constexpr float GetNormalizedRed() const noexcept {
return r / 255.0f;
}
constexpr float GetNormalizedGreen() const noexcept {
return g / 255.0f;
}
constexpr float GetNormalizedBlue() const noexcept {
return b / 255.0f;
}
constexpr float GetNormalizedAlpha() const noexcept {
return a / 255.0f;
}
constexpr glm::ivec4 ToIVec() const noexcept {
return { r, g, b, a };
}
constexpr glm::vec4 ToVec() const noexcept {
return { GetNormalizedRed(), GetNormalizedGreen(), GetNormalizedBlue(), GetNormalizedAlpha() };
}
// Forward declaring because cyclic reference between RgbaColor and HsvColor
constexpr HsvColor ToHsv() const noexcept;
friend constexpr bool operator==(const RgbaColor&, const RgbaColor&) noexcept = default;
};
constexpr RgbaColor kXAxisColor(0xFF, 0x80, 0x80, 0xFF);
constexpr RgbaColor kYAxisColor(0x80, 0xFF, 0x80, 0xFF);
constexpr RgbaColor kZAxisColor(0x80, 0x80, 0xFF, 0xFF);
class HsvColor {
public:
float h;
float s;
float v;
float a;
public:
constexpr HsvColor() noexcept
: h{ 0.0f }
, s{ 0.0f }
, v{ 1.0f }
, a{ 1.0f } {
}
constexpr HsvColor(float h, float s, float v, float a) noexcept
: h{ h }
, s{ s }
, v{ v }
, a{ a } {
}
// Forward declaring because cyclic reference between RgbaColor and HsvColor
constexpr RgbaColor ToRgba() const noexcept;
};
constexpr HsvColor RgbaColor::ToHsv() const noexcept {
float r = GetNormalizedRed();
float g = GetNormalizedBlue();
float b = GetNormalizedGreen();
float a = GetNormalizedAlpha();
auto p = g < b ? glm::vec4(b, g, -1, 2.0f / 3.0f) : glm::vec4(g, b, 0, -1.0f / 3.0f);
auto q = r < p.x ? glm::vec4(p.x, p.y, p.w, r) : glm::vec4(r, p.y, p.z, p.x);
float c = q.x - std::min(q.w, q.y);
float h = Utils::Abs((q.w - q.y) / (6 * c + std::numeric_limits<float>::epsilon()) + q.z);
glm::vec3 hcv{ h, c, q.x };
float s = hcv.y / (hcv.z + std::numeric_limits<float>::epsilon());
return HsvColor(hcv.x, s, hcv.z, a);
}
constexpr RgbaColor HsvColor::ToRgba() const noexcept {
float r = Utils::Abs(h * 6 - 3) - 1;
float g = 2 - Utils::Abs(h * 6 - 2);
float b = 2 - Utils::Abs(h * 6 - 4);
auto rgb = glm::vec3{ std::clamp(r, 0.0f, 1.0f), std::clamp(g, 0.0f, 1.0f), std::clamp(b, 0.0f, 1.0f) };
auto vc = (rgb - glm::vec3{ 0, 0, 0 }) * s + glm::vec3{ 1, 1, 1 } * v;
return RgbaColor(vc.x, vc.y, vc.z, a);
}
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