Beckmann HLSL test

gistfile1.txt

float beckmann1(float m : M, float NdotH : NDOTH) : SV_Target0
{
	float oneOverMSquared = 1.0 / (m*m);
	float NdotHSquared = NdotH * NdotH;
	return exp((NdotHSquared - 1.0) / NdotHSquared * oneOverMSquared) * oneOverMSquared * (1.0 / 3.141592654) / (NdotHSquared * NdotHSquared);
}

mad r0.x, v0.y, v0.y, l(-1.000000)
mul r0.yz, v0.xxyx, v0.xxyx
div r0.x, r0.x, r0.z
div r0.y, l(1.000000, 1.000000, 1.000000, 1.000000), r0.y
mul r0.xz, r0.yyzy, r0.xxzx
mul r0.x, r0.x, l(1.442695)
exp r0.x, r0.x
mul r0.x, r0.y, r0.x
mul r0.x, r0.x, l(0.318310)
div o0.x, r0.x, r0.z

float beckmann2(float m : M, float NdotH : NDOTH) : SV_Target0
{
	float oneOverMSquared = 1.0 / (m*m);
	float NdotHSquared = NdotH * NdotH;
	return exp((1.0 - 1.0 / NdotHSquared) * oneOverMSquared) * oneOverMSquared * (1.0 / 3.141592654) / (NdotHSquared * NdotHSquared);
}

mul r0.xy, v0.xyxx, v0.xyxx
div r0.xz, l(1.000000, 1.000000, 1.000000, 1.000000), r0.xxyx
add r0.z, -r0.z, l(1.000000)
mul r0.yz, r0.yyxy, r0.yyzy
mul r0.z, r0.z, l(1.442695)
exp r0.z, r0.z
mul r0.x, r0.x, r0.z
mul r0.x, r0.x, l(0.318310)
div o0.x, r0.x, r0.y