skip all selection pass rendering for styles that don't support featu…

…re selection

e.g. pure raster styles don't support selection, but rendering was only returning from inner loop, causing subsequent mesh/tile combinations to fail

src/scene.js

@@ -632,20 +632,26 @@ export default class Scene {
                     continue;
                 }
 
-                // Render current mesh variant for current style for current tile
+                // Get meshes for current variant order, current style, and current tile
                 const meshes = tile.meshes[style_name].filter(m => m.variant.order === mo); // find meshes by variant order
-                meshes.forEach(mesh => {
-                    // Style-specific state
-                    // Only setup style if rendering for first time this frame
-                    // (lazy init, not all styles will be used in all screen views; some styles might be defined but never used)
-                    if (first_for_style === true) {
-                        first_for_style = false;
-                        program = this.setupStyle(style, program_key);
-                        if (!program) {
-                            return 0;
-                        }
+                if (meshes.length === 0) {
+                    continue;
+                }
+
+                // Style-specific state
+                // Only setup style if rendering for first time this frame
+                // (lazy init, not all styles will be used in all screen views; some styles might be defined but never used)
+                if (first_for_style === true) {
+                    first_for_style = false;
+                    program = this.setupStyle(style, program_key);
+                    if (!program) {
+                        // no program found, e.g. happens when rendering selection pass, but style doesn't support selection
+                        return 0;
                     }
+                }
 
+                // Render each mesh (for current variant order)
+                meshes.forEach(mesh => {
                     // Tile-specific state
                     if (first_for_tile === true) {
                         first_for_tile = false;