From 6f6d705f2276a55bb7301e9a675c32ff6b05bacf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Fernando=20Garc=C3=ADa=20Li=C3=B1=C3=A1n?=
 <fernandogarcialinan@gmail.com>
Date: Mon, 23 Nov 2020 16:33:09 +0100
Subject: [PATCH] Add support for anisotropic filtering in Canvas

---
 simgear/canvas/Canvas.cxx  | 4 ++++
 simgear/canvas/ODGauge.cxx | 6 ++++++
 simgear/canvas/ODGauge.hxx | 2 ++
 3 files changed, 12 insertions(+)

diff --git a/simgear/canvas/Canvas.cxx b/simgear/canvas/Canvas.cxx
index 4650e099..16504823 100644
--- a/simgear/canvas/Canvas.cxx
+++ b/simgear/canvas/Canvas.cxx
@@ -691,6 +691,10 @@ namespace canvas
       {
         _sampling_dirty = true;
       }
+      else if( name == "anisotropy" )
+      {
+        _texture.setMaxAnisotropy( node->getFloatValue() );
+      }
       else if( name == "additive-blend" )
       {
         _texture.useAdditiveBlend( node->getBoolValue() );
diff --git a/simgear/canvas/ODGauge.cxx b/simgear/canvas/ODGauge.cxx
index 12bb52d2..4b5ec62c 100644
--- a/simgear/canvas/ODGauge.cxx
+++ b/simgear/canvas/ODGauge.cxx
@@ -202,6 +202,12 @@ namespace canvas
     updateSampling();
   }
 
+  //----------------------------------------------------------------------------
+  void ODGauge::setMaxAnisotropy(float anis)
+  {
+    texture->setMaxAnisotropy(anis);
+  }
+
   //----------------------------------------------------------------------------
   void ODGauge::setRender(bool render)
   {
diff --git a/simgear/canvas/ODGauge.hxx b/simgear/canvas/ODGauge.hxx
index e303c4e3..d673d69a 100644
--- a/simgear/canvas/ODGauge.hxx
+++ b/simgear/canvas/ODGauge.hxx
@@ -109,6 +109,8 @@ namespace canvas
                         int coverage_samples = 0,
                         int color_samples = 0 );
 
+      void setMaxAnisotropy(float anis);
+
       /**
        * Enable/Disable updating the texture (If disabled the contents of the
        * texture remains with the outcome of the last rendering pass)