implement basic tectonics + tectonic direction and velocity

src/types/TectonicMetadata.ts

@@ -0,0 +1,60 @@
+export interface TectonicPlate {
+  id: number;
+  cells: Set<number>;
+  isOceanic: boolean;
+  velocity: [number, number, number]; // 3D velocity vector on sphere surface
+  baseElevation: number;
+  seedCell: number;
+}
+
+export type BoundarySubtype =
+  | "cont-cont"
+  | "ocean-cont"
+  | "ocean-ocean"
+  | "cont-rift"
+  | "ocean-rift"
+  | "transform";
+
+export interface PlateBoundary {
+  plateA: number;
+  plateB: number;
+  cells: number[];
+  convergence: number;
+  subtype: BoundarySubtype;
+}
+
+export interface TectonicConfig {
+  plateCount: number;
+  continentalRatio: number;
+  collisionIntensity: number;
+  noiseLevel: number;
+  hotspotCount: number;
+  smoothingPasses: number;
+  erosionPasses: number;
+  seaLevel: number; // elevation shift: 0 = default, positive = more water, negative = more land
+}
+
+export const DEFAULT_TECTONIC_CONFIG: TectonicConfig = {
+  plateCount: 12,
+  continentalRatio: 0.35,
+  collisionIntensity: 1.0,
+  noiseLevel: 0.3,
+  hotspotCount: 3,
+  smoothingPasses: 3,
+  erosionPasses: 2,
+  seaLevel: 0
+};
+
+export interface TectonicMetadata {
+  plateIds: Uint8Array;
+  boundaryType: Int8Array;
+  roughness: Float32Array;
+  isOceanic: Uint8Array;
+  plates: TectonicPlate[];
+  boundaries: PlateBoundary[];
+}
+
+declare global {
+  var tectonicMetadata: TectonicMetadata | null;
+  var tectonicGenerator: import("../modules/tectonic-generator").TectonicPlateGenerator | null;
+}

src/types/global.ts

@@ -15,6 +15,7 @@ declare global {
   var options: any;
 
   var heightmapTemplates: any;
+  var tectonicTemplates: any;
   var Routes: any;
   var populationRate: number;
   var urbanDensity: number;