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dot.3Cg
Langue: en
Version: 355880 (ubuntu - 24/10/10)
Section: 3 (Bibliothèques de fonctions)
NAME
dot - returns the scalar dot product of two vectorsSYNOPSIS
float dot(float a, float b); float1 dot(float1 a, float1 b); float2 dot(float2 a, float2 b); float3 dot(float3 a, float3 b); float4 dot(float4 a, float4 b);
half dot(half a, half b); half1 dot(half1 a, half1 b); half2 dot(half2 a, half2 b); half3 dot(half3 a, half3 b); half4 dot(half4 a, half4 b);
fixed dot(fixed a, fixed b); fixed1 dot(fixed1 a, fixed1 b); fixed2 dot(fixed2 a, fixed2 b); fixed3 dot(fixed3 a, fixed3 b); fixed4 dot(fixed4 a, fixed4 b);
PARAMETERS
- a
- First vector.
- b
- Second vector.
DESCRIPTION
Returns the scalar dot product of two same-typed vectors a and b.REFERENCE IMPLEMENTATION
dot for float4 vectors could be implemented this way:float dot(float4 a, float4 b) { return a.x*b.x + a.y*b.y + a.z*b.z + a.w*b.w; }
PROFILE SUPPORT
dot is supported in all profiles.The fixed3 dot product is very efficient in the fp20 and fp30 profiles.
The float3 and float4 dot products are very efficient in the vp20, vp30, vp40, arbvp1, fp30, fp40, and arbfp1 profiles.
The float2 dot product is very efficient in the fp40 profile. In optimal circumstances, two two-component dot products can sometimes be performed at the four-component and three-component dot product rate.
SEE ALSO
cross, lit, mulContenus ©2006-2024 Benjamin Poulain
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