renderdensity.fp

PDE simulator on GPU.

!!FP1.0
#texture lookup (i,j)
ADD R0, f[TEX0].xyxy, {-0.5,-0.5,-0.5,-0.5};
FRC R1, R0;
FLR R0, R0;
ADD R0, R0, {0,0,1,1};

TEX R2, R0.xyww, TEX0, RECT;
TEX R3, R0.zyww, TEX0, RECT;
TEX R4, R0.xwww, TEX0, RECT;
TEX R5, R0.zwww, TEX0, RECT;

LRP R6, R1.xxxx, R3, R2;
LRP R7, R1.xxxx, R5, R4;
LRP R6, R1.yyyy, R7, R6;

MUL o[COLR], R6.zzzw, {1,1,2,0};
END