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mesa: fix/improve the atan(y,x) function

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This commit is contained in:
Brian Paul 2008-07-17 10:03:10 -06:00
parent 8336fbc35c
commit 91de7b6cd3
1 changed files with 11 additions and 10 deletions
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21
src/mesa/shader/slang/library/slang_common_builtin.gc
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@ -401,16 +401,17 @@ vec4 atan(const vec4 y_over_x)
float atan(const float y, const float x)
{
if (x == 0.0)
return 0.0;
float z = atan(y / x);
if (x < 0.0)
{
if (y < 0.0)
return z - 3.141593;
return z + 3.141593;
}
return z;
float r;
if (abs(x) > 1.0e-4) {
r = atan(y / x);
if (x < 0.0) {
r = r + sign(y) * 3.141593;
}
}
else {
r = sign(y) * 1.5707965; // pi/2
}
return r;
}
vec2 atan(const vec2 u, const vec2 v)