diff options
Diffstat (limited to 'src/shader/code/extra.glsl')
-rw-r--r-- | src/shader/code/extra.glsl | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/shader/code/extra.glsl b/src/shader/code/extra.glsl index 3fec976..b8483ae 100644 --- a/src/shader/code/extra.glsl +++ b/src/shader/code/extra.glsl @@ -23,6 +23,11 @@ uint indexOfFluidVertex(uint x, uint y) { /// Data access +int getMaterial(uint x, uint y) { + const uint idx = indexOfFluidVertex(x, y); + return int(extraCells[idx + 2]); +} + vec2 getFluidVelocity(uint x, uint y) { const uint idx = indexOfFluidVertex(x, y); return vec2( @@ -44,6 +49,15 @@ void main() { return; } + if ( getMaterial(x,y) != 1 + || getMaterial(x-1,y) != 1 + || getMaterial(x+1,y) != 1 + || getMaterial(x,y-1) != 1 + || getMaterial(x,y+1) != 1 ) { + setFluidExtra(x, y, 0.0); + return; + } + // simple central difference discretization of the 2d curl operator const float dxvy = (getFluidVelocity(x+1,y).y - getFluidVelocity(x-1,y).y) / (2*convLength); |