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log2.3Cg
Langue: en
Version: 347411 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
log2 - returns the base-2 logarithm of scalars and vectorsSYNOPSIS
float log2(float a); float1 log2(float1 a); float2 log2(float2 a); float3 log2(float3 a); float4 log2(float4 a);
half log2(half a); half1 log2(half1 a); half2 log2(half2 a); half3 log2(half3 a); half4 log2(half4 a);
fixed log2(fixed a); fixed1 log2(fixed1 a); fixed2 log2(fixed2 a); fixed3 log2(fixed3 a); fixed4 log2(fixed4 a);
PARAMETERS
- a
- Vector or scalar of which to determine the base-2 logarithm.
DESCRIPTION
Returns the base-2 logarithm a.For vectors, the returned vector contains the base-2 logarithm of each element of the input vector.
REFERENCE IMPLEMENTATION
float3 log2(float3 a) { float3 rv; int i;
for (i=0; i<3; i++) { rv[i] = log2(a[i]); // this is the ANSI C standard library log2() } return rv; }log2 is typically implemented with a native base-2 logarithm instruction.
PROFILE SUPPORT
log2 is fully supported in all profiles unless otherwise specified.Support in the fp20 is limited to constant compile-time evaluation.
SEE ALSO
exp, log, log10, powContenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre