diff options
Diffstat (limited to 'src/shader/code/interact.glsl')
-rw-r--r-- | src/shader/code/interact.glsl | 51 |
1 files changed, 22 insertions, 29 deletions
diff --git a/src/shader/code/interact.glsl b/src/shader/code/interact.glsl index a65d96a..cb69333 100644 --- a/src/shader/code/interact.glsl +++ b/src/shader/code/interact.glsl @@ -10,10 +10,11 @@ uniform uint nY; /// External influence -uniform int prevMouseState; -uniform vec2 prevMousePos; -uniform int currMouseState; -uniform vec2 currMousePos; +uniform bool influxRequested; +uniform bool wallRequested; + +uniform vec2 startOfLine; +uniform vec2 endOfLine; /// Vector utilities @@ -37,6 +38,14 @@ float distanceToLineSegment(vec2 a, vec2 b, vec2 p) { return norm(pa - ab * (dot(ab, pa) / dot(ab, ab))); } +bool isNearLine(uint x, uint y, float eps) { + if ( startOfLine == endOfLine ) { + return norm(vec2(x,y) - endOfLine) < eps; + } else { + return distanceToLineSegment(startOfLine, endOfLine, vec2(x,y)) < eps; + } +} + /// Array indexing uint indexOfFluidVertex(uint x, uint y) { @@ -74,24 +83,6 @@ void disableWallInterior(uint x, uint y) { } } -/// Determine external influence - -bool isNearMouse(uint x, uint y, float eps) { - if ( prevMouseState == currMouseState ) { - return distanceToLineSegment(prevMousePos, currMousePos, vec2(x,y)) < eps; - } else { - return norm(vec2(x,y) - currMousePos) < eps; - } -} - -bool isInfluxRequestedAt(uint x, uint y) { - return currMouseState == 1 && isNearMouse(x, y, 3); -} - -bool isWallRequestedAt(uint x, uint y) { - return currMouseState == 2 && isNearMouse(x, y, 3); -} - /// Actual interaction kernel void main() { @@ -105,13 +96,15 @@ void main() { const int material = getMaterial(x,y); if ( material == 1 ) { - if ( isInfluxRequestedAt(x,y) ) { - setMaterial(x,y,4); - return; - } - if ( isWallRequestedAt(x,y) ) { - setMaterial(x,y,3); - return; + if ( isNearLine(x, y, 3) ) { + if ( influxRequested ) { + setMaterial(x,y,4); + return; + } + if ( wallRequested ) { + setMaterial(x,y,3); + return; + } } } |