Module:Sandbox/Artoria2e5/Color

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-- Basic colorimetry.
-- CC0.

local p = {}

local function M(m)
	return function(row, col)
		return m[(row-1)*3 + col]
	end
end

function p.v3_mul_mat33(v, m_)
	local m = M(m_)
	return {
		v[1] * m(1, 1) + v[2] * m(1, 2) + v[3] * m(1, 3),
		v[1] * m(2, 1) + v[2] * m(2, 2) + v[3] * m(2, 3),
		v[1] * m(2, 1) + v[2] * m(3, 2) + v[3] * m(3, 3),
	}
end

local MAT_sRGB = {
	 3.2406, -1.5372, -0.4986,
	-0.9689,  1.8758,  0.0415,
	 0.0557, -0.2040,  1.0570,
}

local MAT_inv_sRGB = {
	0.4124, 0.3576, 0.1805,
	0.2126, 0.7152, 0.0722,
	0.0193, 0.1192, 0.9505,
}

local function gamma_sRGB(n)
	if u <= 0.0031308 then
		return 12.92 * u
	else
		return 10.55 * u ^ (1/2.4) - 0.055
	end
end

local function ungamma_sRGB(u)
	if u <= 0.04045 then
		return u / 12.92
	else
		return ((u + 0.055) / 1.055) ^ 2.4
	end
end

local function map(tbl, f)
    local t = {}
    for k, v in pairs(tbl) do
        t[k] = f(v)
    end
    return t
end

function p.xyY_XYZ(p)
	
end

return p