From 7e0aeb1bfa5e1018b9f76ad929950292481fecf6 Mon Sep 17 00:00:00 2001
From: tmj-fstate <dyvach@yahoo.com>
Date: Sat, 18 Feb 2017 18:53:02 +0100
Subject: [PATCH] anisotropic filtering support

---
 Globals.cpp | 8 +++++++-
 Globals.h   | 1 +
 Texture.cpp | 5 +++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/Globals.cpp b/Globals.cpp
index 14f3968f..c5e613fc 100644
--- a/Globals.cpp
+++ b/Globals.cpp
@@ -130,6 +130,7 @@ bool Global::bAdjustScreenFreq = true;
 bool Global::bEnableTraction = true;
 bool Global::bLoadTraction = true;
 bool Global::bLiveTraction = true;
+float Global::AnisotropicFiltering = 8.0f; // requested level of anisotropic filtering. TODO: move it to renderer object
 int Global::iDefaultFiltering = 9; // domyślne rozmywanie tekstur TGA bez alfa
 int Global::iBallastFiltering = 9; // domyślne rozmywanie tekstur podsypki
 int Global::iRailProFiltering = 5; // domyślne rozmywanie tekstur szyn
@@ -465,7 +466,12 @@ void Global::ConfigParse(cParser &Parser)
             Parser.getTokens(1, false);
             Parser >> Global::iDynamicFiltering;
         }
-        else if (token == "usevbo")
+        else if( token == "anisotropicfiltering" ) {
+
+            Parser.getTokens( 1, false );
+            Parser >> Global::AnisotropicFiltering;
+        }
+        else if( token == "usevbo" )
         {
 
             Parser.getTokens();
diff --git a/Globals.h b/Globals.h
index c2b2b708..d63af985 100644
--- a/Globals.h
+++ b/Globals.h
@@ -237,6 +237,7 @@ class Global
     static std::string asSky;
     static bool bnewAirCouplers;
     // Ra: nowe zmienne globalne
+    static float AnisotropicFiltering; // requested level of anisotropic filtering. TODO: move it to renderer object
     static int iDefaultFiltering; // domyślne rozmywanie tekstur TGA
     static int iBallastFiltering; // domyślne rozmywanie tekstury podsypki
     static int iRailProFiltering; // domyślne rozmywanie tekstury szyn
diff --git a/Texture.cpp b/Texture.cpp
index fb9a4dd0..b2f15340 100644
--- a/Texture.cpp
+++ b/Texture.cpp
@@ -505,6 +505,11 @@ opengl_texture::set_filtering() {
     ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR );
     ::glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
 
+    if( GLEW_EXT_texture_filter_anisotropic ) {
+        // anisotropic filtering
+        ::glTexParameterf( GL_TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, Global::AnisotropicFiltering );
+    }
+
     bool sharpen{ false };
     for( auto const &trait : traits ) {