85 lines
2.9 KiB
Plaintext
85 lines
2.9 KiB
Plaintext
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/// @ref gtc_color_space
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namespace glm{
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namespace detail
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{
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template<length_t L, typename T, qualifier Q>
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struct compute_rgbToSrgb
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& ColorRGB, T GammaCorrection)
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{
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vec<L, T, Q> const ClampedColor(clamp(ColorRGB, static_cast<T>(0), static_cast<T>(1)));
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return mix(
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pow(ClampedColor, vec<L, T, Q>(GammaCorrection)) * static_cast<T>(1.055) - static_cast<T>(0.055),
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ClampedColor * static_cast<T>(12.92),
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lessThan(ClampedColor, vec<L, T, Q>(static_cast<T>(0.0031308))));
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}
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};
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template<typename T, qualifier Q>
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struct compute_rgbToSrgb<4, T, Q>
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{
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GLM_FUNC_QUALIFIER static vec<4, T, Q> call(vec<4, T, Q> const& ColorRGB, T GammaCorrection)
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{
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return vec<4, T, Q>(compute_rgbToSrgb<3, T, Q>::call(vec<3, T, Q>(ColorRGB), GammaCorrection), ColorRGB.w);
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}
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};
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template<length_t L, typename T, qualifier Q>
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struct compute_srgbToRgb
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{
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GLM_FUNC_QUALIFIER static vec<L, T, Q> call(vec<L, T, Q> const& ColorSRGB, T Gamma)
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{
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return mix(
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pow((ColorSRGB + static_cast<T>(0.055)) * static_cast<T>(0.94786729857819905213270142180095), vec<L, T, Q>(Gamma)),
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ColorSRGB * static_cast<T>(0.07739938080495356037151702786378),
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lessThanEqual(ColorSRGB, vec<L, T, Q>(static_cast<T>(0.04045))));
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}
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};
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template<typename T, qualifier Q>
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struct compute_srgbToRgb<4, T, Q>
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{
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GLM_FUNC_QUALIFIER static vec<4, T, Q> call(vec<4, T, Q> const& ColorSRGB, T Gamma)
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{
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return vec<4, T, Q>(compute_srgbToRgb<3, T, Q>::call(vec<3, T, Q>(ColorSRGB), Gamma), ColorSRGB.w);
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}
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};
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}//namespace detail
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> convertLinearToSRGB(vec<L, T, Q> const& ColorLinear)
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{
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return detail::compute_rgbToSrgb<L, T, Q>::call(ColorLinear, static_cast<T>(0.41666));
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}
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// Based on Ian Taylor http://chilliant.blogspot.fr/2012/08/srgb-approximations-for-hlsl.html
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template<>
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GLM_FUNC_QUALIFIER vec<3, float, lowp> convertLinearToSRGB(vec<3, float, lowp> const& ColorLinear)
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{
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vec<3, float, lowp> S1 = sqrt(ColorLinear);
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vec<3, float, lowp> S2 = sqrt(S1);
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vec<3, float, lowp> S3 = sqrt(S2);
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return 0.662002687f * S1 + 0.684122060f * S2 - 0.323583601f * S3 - 0.0225411470f * ColorLinear;
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> convertLinearToSRGB(vec<L, T, Q> const& ColorLinear, T Gamma)
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{
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return detail::compute_rgbToSrgb<L, T, Q>::call(ColorLinear, static_cast<T>(1) / Gamma);
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> convertSRGBToLinear(vec<L, T, Q> const& ColorSRGB)
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{
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return detail::compute_srgbToRgb<L, T, Q>::call(ColorSRGB, static_cast<T>(2.4));
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}
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template<length_t L, typename T, qualifier Q>
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GLM_FUNC_QUALIFIER vec<L, T, Q> convertSRGBToLinear(vec<L, T, Q> const& ColorSRGB, T Gamma)
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{
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return detail::compute_srgbToRgb<L, T, Q>::call(ColorSRGB, Gamma);
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}
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}//namespace glm
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