feat: add tectonic plate simulation for physically-based heightmap generation

.gitignore

@@ -9,4 +9,5 @@
 /_bmad
 /_bmad-output
 .github/agents/bmad-*
-.github/prompts/bmad-*
+.github/prompts/bmad-*
+/.claude

public/config/tectonic-templates.js

@@ -0,0 +1,70 @@
+"use strict";
+
+const tectonicTemplates = (function () {
+  return {
+    tectonic: {
+      id: 14,
+      name: "Tectonic",
+      template: "tectonic",
+      probability: 10,
+      config: {
+        plateCount: 20,
+        continentalRatio: 0.2,
+        collisionIntensity: 1.5,
+        noiseLevel: 0.3,
+        hotspotCount: 3,
+        smoothingPasses: 3,
+        erosionPasses: 5,
+        seaLevel: 5
+      }
+    },
+    tectonicPangea: {
+      id: 15,
+      name: "Tectonic Pangea",
+      template: "tectonic",
+      probability: 5,
+      config: {
+        plateCount: 8,
+        continentalRatio: 0.55,
+        collisionIntensity: 1.2,
+        noiseLevel: 0.25,
+        hotspotCount: 3,
+        smoothingPasses: 4,
+        erosionPasses: 2,
+        seaLevel: -3
+      }
+    },
+    tectonicArchipelago: {
+      id: 16,
+      name: "Tectonic Archipelago",
+      template: "tectonic",
+      probability: 5,
+      config: {
+        plateCount: 15,
+        continentalRatio: 0.25,
+        collisionIntensity: 0.8,
+        noiseLevel: 0.35,
+        hotspotCount: 5,
+        smoothingPasses: 3,
+        erosionPasses: 2,
+        seaLevel: 3
+      }
+    },
+    tectonicRift: {
+      id: 17,
+      name: "Tectonic Rift",
+      template: "tectonic",
+      probability: 3,
+      config: {
+        plateCount: 10,
+        continentalRatio: 0.4,
+        collisionIntensity: 1.5,
+        noiseLevel: 0.3,
+        hotspotCount: 2,
+        smoothingPasses: 3,
+        erosionPasses: 3,
+        seaLevel: 0
+      }
+    }
+  };
+})();

public/modules/dynamic/heightmap-selection.js

@@ -194,11 +194,19 @@ function insertHtml() {
 
   const sections = document.getElementsByClassName("heightmap-selection_container");
 
-  sections[0].innerHTML = Object.keys(heightmapTemplates)
+  const allTemplateKeys = Object.keys(heightmapTemplates);
+  if (typeof tectonicTemplates !== "undefined") {
+    allTemplateKeys.push(...Object.keys(tectonicTemplates));
+  }
+
+  sections[0].innerHTML = allTemplateKeys
     .map(key => {
-      const name = heightmapTemplates[key].name;
+      const isTectonic = typeof tectonicTemplates !== "undefined" && key in tectonicTemplates;
+      const name = isTectonic ? tectonicTemplates[key].name : heightmapTemplates[key].name;
       Math.random = aleaPRNG(initialSeed);
-      const heights = HeightmapGenerator.fromTemplate(graph, key);
+      const heights = isTectonic
+        ? HeightmapGenerator.fromTectonic(graph, tectonicTemplates[key].config)
+        : HeightmapGenerator.fromTemplate(graph, key);
 
       return /* html */ `<article data-id="${key}" data-seed="${initialSeed}">
         <img src="${getHeightmapPreview(heights)}" alt="${name}" />
@@ -255,6 +263,8 @@ function getSeed() {
 }
 
 function getName(id) {
+  const isTectonic = typeof tectonicTemplates !== "undefined" && id in tectonicTemplates;
+  if (isTectonic) return tectonicTemplates[id].name;
   const isTemplate = id in heightmapTemplates;
   return isTemplate ? heightmapTemplates[id].name : precreatedHeightmaps[id].name;
 }
@@ -266,7 +276,10 @@ function getGraph(currentGraph) {
 }
 
 function drawTemplatePreview(id) {
-  const heights = HeightmapGenerator.fromTemplate(graph, id);
+  const isTectonic = typeof tectonicTemplates !== "undefined" && id in tectonicTemplates;
+  const heights = isTectonic
+    ? HeightmapGenerator.fromTectonic(graph, tectonicTemplates[id].config)
+    : HeightmapGenerator.fromTemplate(graph, id);
   const dataUrl = getHeightmapPreview(heights);
   const article = byId("heightmapSelection").querySelector(`[data-id="${id}"]`);
   article.querySelector("img").src = dataUrl;
@@ -294,8 +307,9 @@ function redrawAll() {
     const {id, seed} = article.dataset;
     Math.random = aleaPRNG(seed);
 
+    const isTectonic = typeof tectonicTemplates !== "undefined" && id in tectonicTemplates;
     const isTemplate = id in heightmapTemplates;
-    if (isTemplate) drawTemplatePreview(id);
+    if (isTectonic || isTemplate) drawTemplatePreview(id);
     else drawPrecreatedHeightmap(id);
   }
 }

public/modules/ui/options.js

@@ -624,8 +624,14 @@ function randomizeHeightmapTemplate() {
   for (const key in heightmapTemplates) {
     templates[key] = heightmapTemplates[key].probability || 0;
   }
+  if (typeof tectonicTemplates !== "undefined") {
+    for (const key in tectonicTemplates) {
+      templates[key] = tectonicTemplates[key].probability || 0;
+    }
+  }
   const template = rw(templates);
-  const name = heightmapTemplates[template].name;
+  const isTectonic = typeof tectonicTemplates !== "undefined" && template in tectonicTemplates;
+  const name = isTectonic ? tectonicTemplates[template].name : heightmapTemplates[template].name;
   applyOption(byId("templateInput"), template, name);
 }