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Cycles: Minor optimization of equirectangular projection 

Don't calculate sine twice, store this in a variable instead.

Perhaps compilers can optimize this out, but helping them a but wouldn't hurt.
This commit is contained in:
Sergey Sharybin 2016-03-24 15:00:09 +01:00
parent 8249046b82
commit 60cf62ff4b
1 changed files with 8 additions and 9 deletions
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17
intern/cycles/kernel/kernel_projection.h
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@ -47,10 +47,10 @@ ccl_device float2 direction_to_spherical(float3 dir)
ccl_device float3 spherical_to_direction(float theta, float phi)
{
return make_float3(
sinf(theta)*cosf(phi),
sinf(theta)*sinf(phi),
cosf(theta));
float sin_theta = sinf(theta);
return make_float3(sin_theta*cosf(phi),
sin_theta*sinf(phi),
cosf(theta));
}
/* Equirectangular coordinates <-> Cartesian direction */
@ -67,11 +67,10 @@ ccl_device float3 equirectangular_range_to_direction(float u, float v, float4 ra
{
float phi = range.x*u + range.y;
float theta = range.z*v + range.w;
return make_float3(
sinf(theta)*cosf(phi),
sinf(theta)*sinf(phi),
cosf(theta));
float sin_theta = sinf(theta);
return make_float3(sin_theta*cosf(phi),
sin_theta*sinf(phi),
cosf(theta));
}
ccl_device float2 direction_to_equirectangular(float3 dir)