From f74693640e342ee637e1ba420fccdea65b9fefb1 Mon Sep 17 00:00:00 2001
From: ExMix <rahuba.youri@mapswithme.com>
Date: Tue, 18 Nov 2014 11:10:43 +0300
Subject: [PATCH] [drape] reduce OGL state changes. Reduce count of tile
 reading

---
 drape_frontend/frontend_renderer.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drape_frontend/frontend_renderer.cpp b/drape_frontend/frontend_renderer.cpp
index 1fe377bb47..ee331cab48 100644
--- a/drape_frontend/frontend_renderer.cpp
+++ b/drape_frontend/frontend_renderer.cpp
@@ -213,6 +213,7 @@ void FrontendRenderer::RenderScene()
     if (prevLayer != layer && layer == dp::GLState::OverlayLayer)
       GLFunctions::glClearDepth();
 
+    prevLayer = layer;
     ASSERT_LESS_OR_EQUAL(prevLayer, layer, ());
 
     dp::RefPointer<dp::GpuProgram> program = m_gpuProgramManager->GetProgram(state.GetProgramIndex());
@@ -278,7 +279,11 @@ void FrontendRenderer::ResolveTileKeys(set<TileKey> & keyStorage, int tileScale)
   for (int tileY = minTileY; tileY < maxTileY; ++tileY)
   {
     for (int tileX = minTileX; tileX < maxTileX; ++tileX)
-      keyStorage.insert(TileKey(tileX, tileY, tileScale));
+    {
+      TileKey key(tileX, tileY, tileScale);
+      if (clipRect.IsIntersect(key.GetGlobalRect()))
+        keyStorage.insert(key);
+    }
   }
 }