GPU Pro 6

1. Block-Wise Linear Binary Grids for Fast Ray-Casting Operations 499

float3 f3CPos = f3CPosOrg ;

adr . z =0;

adr . y = int ( tc . y g_vRSMDimensions . y +(−LFS )+i2Off . y );

// Loop over sparse VPL kernel

for ( float row = −LFS ; row <= LFS ; row += 6 . 0 f , adr . y += 6 )

{

adr . x = int ( tc . x g_vRSMDimensions . x +(−LFS )+i2Off . x );

for( float col = −LFS ; col <= LFS ; col += 6 . 0 f , adr . x += 6 )

{

float3 f3Pos , f3Col , f3N ;

// Unpack G−buffer data

float3 f3Col , f3Pos , f3N ;

GetGBufferData ( f3Col , f3Pos , f3N );

// Compute indirect light contribution

float3 f3D = f3Pos . xyz − f3CPosOrg . xyz ;

float fLen = length( f3D );

float fInvLen