void RenderPlayerShroud(CellRegion visibleRegion)
{
// Render the shroud by drawing the appropriate tile over each cell that is visible on-screen.
// For performance we keep a cache tiles we have drawn previously so we don't have to recalculate the
// vertices for tiles every frame, since this is costly.
// Any shroud marked as dirty has either never been calculated, or has changed since we last drew that
// tile. We will calculate the vertices for that tile and cache them before drawing it.
// Any shroud that is not marked as dirty means our cached tile is still correct - we can just draw the
// cached vertices.
var visibleUnderShroud = currentShroud.IsExploredTest(visibleRegion);
var visibleUnderFog = currentShroud.IsVisibleTest(visibleRegion);
foreach (var uv in visibleRegion.MapCoords)
{
var offset = VertexArrayOffset(uv);
if (shroudDirty[uv])
{
shroudDirty[uv] = false;
RenderDirtyTile(uv, offset, visibleUnderShroud, shroudSprites, shroudVertices, shroudPalette, shroudSpriteLayer);
RenderDirtyTile(uv, offset, visibleUnderFog, fogSprites, fogVertices, fogPalette, fogSpriteLayer);
}
else
{
RenderCachedTile(shroudSpriteLayer[uv], shroudVertices, offset);
RenderCachedTile(fogSpriteLayer[uv], fogVertices, offset);
}
}
}
void UpdateShroud(Shroud shroud)
{
var visibleUnderShroud = shroud.IsExploredTest(updatedRegion);
var visibleUnderFog = shroud.IsVisibleTest(updatedRegion);
foreach (var cell in updatedRegion)
{
var shrouded = GetEdges(cell, visibleUnderShroud);
var fogged = GetEdges(cell, visibleUnderFog);
var shroudTile = tiles[cell];
var variant = shroudTile.Variant;
shroudTile.Shroud = GetTile(shroudSprites, shrouded, variant);
shroudTile.Fog = GetTile(fogSprites, fogged, variant);
tiles[cell] = shroudTile;
}
}
