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Color: Add sRGB <=> Linear conversion methods

This commit is contained in:
SirLynix 2023-09-10 14:33:23 +02:00 committed by Jérôme Leclercq
parent b09b4d2419
commit 041be74b9d
2 changed files with 32 additions and 36 deletions
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6
include/Nazara/Core/Color.hpp
View File

@ -62,6 +62,12 @@ namespace Nz
static constexpr void ToXYZ(const Color& color, Vector3f* vec);
static constexpr void ToXYZ(const Color& color, float* x, float* y, float* z);
// Color-space handling
static constexpr float LinearTosRGB(float component);
static constexpr Color LinearTosRGB(const Color& color);
static constexpr float sRGBToLinear(float component);
static constexpr Color sRGBToLinear(const Color& color);
static constexpr Color Black();
static constexpr Color Blue();
static constexpr Color Cyan();

62
include/Nazara/Core/Color.inl
View File

@ -339,20 +339,9 @@ namespace Nz
float g = x * -0.9689f + y * 1.8758f + z * 0.0415f;
float b = x * 0.0557f + y * -0.2040f + z * 1.0570f;
if (r > 0.0031308f)
r = 1.055f * (std::pow(r, 1.f/2.4f)) - 0.055f;
else
r *= 12.92f;
if (g > 0.0031308f)
g = 1.055f * (std::pow(g, 1.f/2.4f)) - 0.055f;
else
g *= 12.92f;
if (b > 0.0031308f)
b = 1.055f * (std::pow(b, 1.f/2.4f)) - 0.055f;
else
b *= 12.92f;
r = LinearTosRGB(r);
g = LinearTosRGB(g);
b = LinearTosRGB(b);
return Color(r, g, b);
}
@ -574,28 +563,9 @@ namespace Nz
*/
constexpr void Color::ToXYZ(const Color& color, float* x, float* y, float* z)
{
float r = color.r; //< R from 0 to 255
float g = color.g; //< G from 0 to 255
float b = color.b; //< B from 0 to 255
if (r > 0.04045f)
r = std::pow((r + 0.055f)/1.055f, 2.4f);
else
r /= 12.92f;
if (g > 0.04045f)
g = std::pow((g + 0.055f)/1.055f, 2.4f);
else
g /= 12.92f;
if (b > 0.04045f)
b = std::pow((b + 0.055f)/1.055f, 2.4f);
else
b /= 12.92f;
r *= 100.f;
g *= 100.f;
b *= 100.f;
float r = sRGBToLinear(color.r) * 100.f;
float g = sRGBToLinear(color.g) * 100.f;
float b = sRGBToLinear(color.b) * 100.f;
//Observer. = 2°, Illuminant = D65
*x = r*0.4124f + g*0.3576f + b*0.1805f;
@ -603,6 +573,26 @@ namespace Nz
*z = r*0.0193f + g*0.1192f + b*0.9505f;
}
constexpr float Color::LinearTosRGB(float component)
{
return (component > 0.0031308f) ? 1.055f * std::pow(component, 1.f / 2.4f) - 0.055f : 12.92f * component;
}
constexpr Color Color::LinearTosRGB(const Color& color)
{
return Color(LinearTosRGB(color.r), LinearTosRGB(color.g), LinearTosRGB(color.b), color.a);
}
constexpr float Color::sRGBToLinear(float component)
{
return (component > 0.04045f) ? std::pow((component + 0.055f) / 1.055f, 2.4f) : component / 12.92f;
}
constexpr Color Color::sRGBToLinear(const Color& color)
{
return Color(sRGBToLinear(color.r), sRGBToLinear(color.g), sRGBToLinear(color.b), color.a);
}
constexpr Color Color::Black()
{
return Color(0.f, 0.f, 0.f);