Make local map resolution configurable and use lower default value

This seems to be the resolution the original engine is using. The change also significantly reduces cell loading time.

apps/openmw/mwrender/globalmap.cpp

@@ -209,8 +209,10 @@ namespace MWRender
 
         if (!localMapTexture.isNull())
         {
+            int mapWidth = localMapTexture->getWidth();
+            int mapHeight = localMapTexture->getHeight();
             mOverlayTexture->load();
-            mOverlayTexture->getBuffer()->blit(localMapTexture->getBuffer(), Ogre::Image::Box(0,0,512,512),
+            mOverlayTexture->getBuffer()->blit(localMapTexture->getBuffer(), Ogre::Image::Box(0,0,mapWidth,mapHeight),
                          Ogre::Image::Box(originX,originY,originX+mCellSize,originY+mCellSize));
 
             Ogre::Image backup;
@@ -218,7 +220,7 @@ namespace MWRender
             data.resize(mCellSize*mCellSize*4, 0);
             backup.loadDynamicImage(&data[0], mCellSize, mCellSize, Ogre::PF_A8B8G8R8);
 
-            localMapTexture->getBuffer()->blitToMemory(Ogre::Image::Box(0,0,512,512), backup.getPixelBox());
+            localMapTexture->getBuffer()->blitToMemory(Ogre::Image::Box(0,0,mapWidth,mapHeight), backup.getPixelBox());
 
             for (int x=0; x<mCellSize; ++x)
                 for (int y=0; y<mCellSize; ++y)

apps/openmw/mwrender/localmap.cpp

@@ -27,6 +27,7 @@ using namespace Ogre;
 LocalMap::LocalMap(OEngine::Render::OgreRenderer* rend, MWRender::RenderingManager* rendering)
     : mInterior(false)
     , mAngle(0.f)
+    , mMapResolution(Settings::Manager::getInt("local map resolution", "Map"))
 {
     mRendering = rend;
     mRenderingManager = rendering;
@@ -50,7 +51,7 @@ LocalMap::LocalMap(OEngine::Render::OgreRenderer* rend, MWRender::RenderingManag
                     "localmap/rtt",
                     ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
                     TEX_TYPE_2D,
-                    sMapResolution, sMapResolution,
+                    mMapResolution, mMapResolution,
                     0,
                     PF_R8G8B8,
                     TU_RENDERTARGET);
@@ -413,7 +414,7 @@ void LocalMap::render(const float x, const float y,
                         texture,
                         ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME,
                         TEX_TYPE_2D,
-                        sMapResolution, sMapResolution,
+                        mMapResolution, mMapResolution,
                         0,
                         PF_R8G8B8);
         tex->getBuffer()->blit(mRenderTexture->getBuffer());

apps/openmw/mwrender/localmap.hpp

@@ -87,7 +87,7 @@ namespace MWRender
         OEngine::Render::OgreRenderer* mRendering;
         MWRender::RenderingManager* mRenderingManager;
 
-        static const int sMapResolution = 512;
+        int mMapResolution;
 
         // the dynamic texture is a bottleneck, so don't set this too high
         static const int sFogOfWarResolution = 32;

files/settings-default.cfg

@@ -115,6 +115,8 @@ use static geometry = true
 # Adjusts the scale of the global map
 global map cell size = 18
 
+local map resolution = 256
+
 [Viewing distance]
 # Limit the rendering distance of small objects
 limit small object distance = false