GPGPU Programming for Games and Science

Sample Applications 421

void CSMai n ( u int 3 c : S V DispatchThreadID)

{

float3 location = spaceDelta . xyz∗( c . xyz + 0.5 f ) ;

float3 diff = location − p osi ti on . xyz ;

float arg = −dot( di ff , d if f )/ data . x ;

float magnitude = data . y∗ exp ( arg ) ;

float4 vortexVelocity = float4(magnitude∗ c r os s ( no rma l . xyz , d i f f ) , 0 . 0 f ) ;

ou tV el ocity [ c . xyz ] = in Ve loc it y [ c . xyz ] + vo rt exV el oci ty ;

}

// From InitializeSource . hlsl :

cbuffer External

{

float4 densityProducer ; //(x,y,z,∗)

float4 densityPData; // ( variance , amplitude , ∗ , ∗)

float4 densityConsumer; //(x,y,z,∗)

float4 densityCData; // ( variance , amplitude ...