float srgb_linear_to_nonlinear_channel(float u)
{
	return (u <= 0.0031308) ? (12.92 * u) : ((1.055 * pow(u, 1.0 / 2.4)) - 0.055);
}

float3 srgb_linear_to_nonlinear(float3 v)
{
	return float3(srgb_linear_to_nonlinear_channel(v.r), srgb_linear_to_nonlinear_channel(v.g), srgb_linear_to_nonlinear_channel(v.b));
}

float srgb_nonlinear_to_linear_channel(float u)
{
	return (u <= 0.04045) ? (u / 12.92) : pow((u + 0.055) / 1.055, 2.4);
}

float3 srgb_nonlinear_to_linear(float3 v)
{
	return float3(srgb_nonlinear_to_linear_channel(v.r), srgb_nonlinear_to_linear_channel(v.g), srgb_nonlinear_to_linear_channel(v.b));
}

float3 rec709_to_rec2020(float3 v)
{
	float r = dot(v, float3(0.6274040f, 0.3292820f, 0.0433136f));
	float g = dot(v, float3(0.0690970f, 0.9195400f, 0.0113612f));
	float b = dot(v, float3(0.0163916f, 0.0880132f, 0.8955950f));
	return float3(r, g, b);
}

float3 rec2020_to_rec709(float3 v)
{
	float r = dot(v, float3(1.6604910, -0.5876411, -0.0728499));
	float g = dot(v, float3(-0.1245505, 1.1328999, -0.0083494));
	float b = dot(v, float3(-0.0181508, -0.1005789, 1.1187297));
	return float3(r, g, b);
}

float reinhard_channel(float x)
{
	return x / (x + 1.0);
}

float3 reinhard(float3 rgb)
{
	return float3(reinhard_channel(rgb.r), reinhard_channel(rgb.g), reinhard_channel(rgb.b));
}