From 8ea8316b1966dc966ebe96fcff94928397fb6775 Mon Sep 17 00:00:00 2001
From: Richard Zink <Richard Zink>
Date: Tue, 13 Oct 2026 20:24:37 +0200
Subject: [PATCH] perf: skip terrain distance pass when unused

---
 vendor/clouds3d.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/vendor/clouds3d.js b/vendor/clouds3d.js
index 7ce2329..24d2613 100644
--- a/vendor/clouds3d.js
+++ b/vendor/clouds3d.js
@@ -2518,7 +2518,7 @@ var terrainDistW = 0;
 var terrainDistH = 0;
 var terrainDistOk = false;
 function ensureTerrainDistFbo(gl, w, h) {
-    if ((!FRONT_HAZE_ON && !CLOUDS_ON) || w <= 0 || h <= 0) { terrainDistOk = false; return false; }
+    if ((!FRONT_HAZE_ON && !(CLOUDS_ON && CLOUD_TERRAIN_OCCLUSION)) || w <= 0 || h <= 0) { terrainDistOk = false; return false; }
     if (terrainDistFbo && terrainDistW === w && terrainDistH === h) return terrainDistOk;
     if (terrainDistFbo) {
         gl.deleteFramebuffer(terrainDistFbo);
@@ -7758,7 +7758,7 @@ window.clouds3dRender = function(target) {
             gl.enableVertexAttribArray(terr.aColor);
             gl.vertexAttribPointer(terr.aColor, 3, gl.FLOAT, false, STRIDE, 32);
         }
-        var distPassOk = (FRONT_HAZE_ON || CLOUDS_ON) && ensureTerrainDistFbo(gl, canvas.width, canvas.height);
+        var distPassOk = (FRONT_HAZE_ON || (CLOUDS_ON && CLOUD_TERRAIN_OCCLUSION)) && ensureTerrainDistFbo(gl, canvas.width, canvas.height);
         if (distPassOk) {
             gl.bindFramebuffer(gl.FRAMEBUFFER, terrainDistFbo);
             gl.viewport(0, 0, terrainDistW, terrainDistH);