v1.32.48 renderer diagnostic + terrain fallback

src/engine/terrain.js

@@ -398,6 +398,23 @@ function terrainSelfHeal(){
   }catch(e){ console.warn('terrain: self-heal failed',e); }
   return false;
 }
+/* Draw the terrain with the MODEL program. Only used when the terrain's own
+   program failed to build on this GPU — see the call site in render3d.js. The
+   VAO is already in the model layout, so this is a bind and a draw; what is
+   lost is the painted map texture, not the geometry. */
+function drawTerrainFallback(){
+  if(terrainStale()&&!terrainSelfHeal()) return;
+  if(!terrVAO||typeof prog3D==='undefined'||!prog3D) return;
+  gl.bindVertexArray(terrVAO);
+  gl.drawElements(gl.TRIANGLES,terrIdxCount,gl.UNSIGNED_INT,0);
+  drawCalls++; triCount+=terrIdxCount/3;
+  if(terrEdgeVAO&&terrEdgeIdxCount){
+    gl.bindVertexArray(terrEdgeVAO);
+    gl.drawElements(gl.TRIANGLES,terrEdgeIdxCount,gl.UNSIGNED_INT,0);
+    drawCalls++;
+  }
+  gl.bindVertexArray(null);
+}
 function drawTerrain(){
   if(terrainStale()&&!terrainSelfHeal()) return;
   if(!terrVAO) return;