From febe696d4b790a3623b276e2e520acfd2a15d8f8 Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Wed, 15 May 2019 17:30:22 +0300
Subject: [core] Avoid unneeded proj matrix calculations in renderer

---
 src/mbgl/renderer/renderer_impl.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index f987bb8666..85f97f78aa 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -312,12 +312,13 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
         bool symbolBucketsChanged = false;
         const bool placementChanged = !placement->stillRecent(updateParameters.timePoint);
         std::set<std::string> usedSymbolLayers;
-
+        mat4 projMatrix;
         if (placementChanged) {
             placement = std::make_unique<Placement>(
                 updateParameters.transformState, updateParameters.mode,
                 updateParameters.transitionOptions, updateParameters.crossSourceCollisions,
                 std::move(placement));
+            updateParameters.transformState.getProjMatrix(projMatrix);
         }
 
         for (auto it = symbolLayers.rbegin(); it != symbolLayers.rend(); ++it) {
@@ -326,8 +327,6 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
 
             if (placementChanged) {
                 usedSymbolLayers.insert(symbolLayer.getID());
-                mat4 projMatrix;
-                updateParameters.transformState.getProjMatrix(projMatrix);
                 placement->placeLayer(*symbolLayer.getSymbolInterface(), projMatrix, updateParameters.debugOptions & MapDebugOptions::Collision);
             }
         }
-- 
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