PQ encode with max brightness.hlsl

float3 ApplyREC2084Curve(float3 L, float maxLuminance)
{
	float m1 = 2610.0 / 4096.0 / 4;
	float m2 = 2523.0 / 4096.0 * 128;
	float c1 = 3424.0 / 4096.0;
	float c2 = 2413.0 / 4096.0 * 32;
	float c3 = 2392.0 / 4096.0 * 32;

	// L = FD / 10000, so if FD == 10000, then L = 1.
	// so to scale max luminance, we want to multiply by maxLuminance / 10000
	float maxLuminanceScale = maxLuminance / 10000.0f;
	L *= maxLuminanceScale;

	float3 Lp = pow(L, m1);
	return pow((c1 + c2 * Lp) / (1 + c3 * Lp), m2);
}