private void Start()
{
// A copy paste of https://github.com/Scrawk/GPU-GEMS-2D-Fluid-Simulation
// Genius who ever wrote that. Some changes to adapt for my use.
_width = 500;
_height = 500;
var size = new Vector2(_width, _height) / 5;
var pos = new Vector2(Screen.width / 2, Screen.height / 2) - size * 0.5f;
_rect = new Rect(pos, size);
_inverseSize = new Vector2(1.0f / _width, 1.0f / _height);
_velocityTex = new RenderTextureRotating(_width, _height, RenderTextureFormat.RGFloat, FilterMode.Bilinear);
_densityTex = new RenderTextureRotating(_width, _height, RenderTextureFormat.RFloat, FilterMode.Bilinear);
_temperatureTex = new RenderTextureRotating(_width, _height, RenderTextureFormat.RFloat, FilterMode.Bilinear);
_pressureTex = new RenderTextureRotating(_width, _height, RenderTextureFormat.RFloat, FilterMode.Point);
_guiTex = new RenderTexture(_width, _height, 0, RenderTextureFormat.ARGB32)
{
filterMode = FilterMode.Bilinear,
wrapMode = TextureWrapMode.Clamp
};
_guiTex.Create();
_divergenceTex = new RenderTexture(_width, _height, 0, RenderTextureFormat.RFloat)
{
filterMode = FilterMode.Point,
wrapMode = TextureWrapMode.Clamp
};
_divergenceTex.Create();
_obstaclesTex = new RenderTexture(_width, _height, 0, RenderTextureFormat.RFloat)
{
filterMode = FilterMode.Point,
wrapMode = TextureWrapMode.Clamp
};
_obstaclesTex.Create();
}
private void Start()
{
_adventMain = AdventShader.FindKernel("Advent");
_buoyancyMain = BuoyancyShader.FindKernel("Buoyancy");
_impulseMain = ImpulseShader.FindKernel("Impulse");
_divergenceMain = DivergenceShader.FindKernel("Divergence");
_jacobiMain = JacobiShader.FindKernel("Jacobi");
_subtractMain = SubtractGradientShader.FindKernel("Subtract");
_clearMain = ClearShader.FindKernel("ClearBuffer");
_tilemap = TileMapObject.GetComponent <Tilemap>();
_mapBounds = _tilemap.cellBounds;
_mapSize = new Vector2Int(_mapBounds.size.x, _mapBounds.size.y);
// Calculate obstacle locations
var walls = new float4[_mapSize.x, _mapSize.y];
foreach (var position in _mapBounds.allPositionsWithin)
{
walls[position.x - _mapBounds.xMin, position.y - _mapBounds.yMin] = new float4(100);
if (position.x == _mapBounds.xMin || position.x == _mapBounds.xMax || position.y == _mapBounds.yMin ||
position.y == _mapBounds.yMax)
{
continue; // Even if border tile is a simulate atmo tile, it will be defined as a wall.
}
if (SimulateAtmoTiles.Contains(_tilemap.GetTile(position)))
{
walls[position.x - _mapBounds.xMin, position.y - _mapBounds.yMin] = new float4(-100);
}
}
_linearMapSize = _mapSize.x * _mapSize.y;
_velocity = new RenderTextureRotating(_linearMapSize, ComputeBufferMode.Dynamic);
_densityTemp = new RenderTextureRotating(_linearMapSize);
_pressure = new RenderTextureRotating(_linearMapSize);
_walls = new ComputeBuffer(_linearMapSize, 4 * sizeof(float), ComputeBufferType.Structured, ComputeBufferMode.SubUpdates);
_walls.SetData(walls);
_divergence = new ComputeBuffer(_linearMapSize, 4 * sizeof(float), ComputeBufferType.Structured, ComputeBufferMode.SubUpdates);
}
