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d3dx9: Use float function in D3DXFresnelTerm().

This commit is contained in:
Rico Schüller 2012-09-28 08:43:14 +02:00 committed by Alexandre Julliard
parent e420409b8d
commit aa344fc88d
1 changed files with 5 additions and 4 deletions
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9
dlls/d3dx9_36/math.c
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@ -81,13 +81,14 @@ FLOAT WINAPI D3DXFresnelTerm(FLOAT costheta, FLOAT refractionindex)
{ {
FLOAT a, d, g, result; FLOAT a, d, g, result;
TRACE("(%f, %f)\n", costheta, refractionindex); TRACE("costheta %f, refractionindex %f)\n", costheta, refractionindex);
g = sqrt(refractionindex * refractionindex + costheta * costheta - 1.0f); g = sqrtf(refractionindex * refractionindex + costheta * costheta - 1.0f);
a = g + costheta; a = g + costheta;
d = g - costheta; d = g - costheta;
result = ( costheta * a - 1.0f ) * ( costheta * a - 1.0f ) / ( ( costheta * d + 1.0f ) * ( costheta * d + 1.0f ) ) + 1.0f; result = (costheta * a - 1.0f) * (costheta * a - 1.0f) / ((costheta * d + 1.0f) * (costheta * d + 1.0f)) + 1.0f;
result = result * 0.5f * d * d / ( a * a ); result *= 0.5f * d * d / (a * a);
return result; return result;
} }