From 3226189d8226db7ace1d6af07106a59ee47cdc96 Mon Sep 17 00:00:00 2001
From: Marianne Gagnon <auria.mg@gmail.com>
Date: Thu, 11 Dec 2014 20:18:00 -0500
Subject: [PATCH] Force disable shadows and GI when OpenGL is not recent
 enough. Fixes #1722

---
 src/graphics/irr_driver.cpp                     |  8 ++++++++
 .../dialogs/custom_video_settings.cpp           | 17 +++++++++++++++--
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/src/graphics/irr_driver.cpp b/src/graphics/irr_driver.cpp
index 613589200..6beb981cd 100644
--- a/src/graphics/irr_driver.cpp
+++ b/src/graphics/irr_driver.cpp
@@ -607,6 +607,14 @@ void IrrDriver::initDevice()
     {
         Log::info("irr_driver", "GLSL supported.");
     }
+
+    if (!supportGeometryShader())
+    {
+        // these options require geometry shaders
+        UserConfigParams::m_shadows = 0;
+        UserConfigParams::m_gi = false;
+    }
+
     // m_glsl might be reset in rtt if an error occurs.
     if(m_glsl)
     {
diff --git a/src/states_screens/dialogs/custom_video_settings.cpp b/src/states_screens/dialogs/custom_video_settings.cpp
index 3dbe33623..05c5c277e 100644
--- a/src/states_screens/dialogs/custom_video_settings.cpp
+++ b/src/states_screens/dialogs/custom_video_settings.cpp
@@ -106,6 +106,12 @@ void CustomVideoSettingsDialog::beforeAddingWidgets()
         cb_tex_cmp->setState(false);
         cb_tex_cmp->setDeactivated();
     }
+
+    if (!irr_driver->supportGeometryShader())
+    {
+        shadows->setDeactivated();
+        getWidget<CheckBoxWidget>("global_illumination")->setDeactivated();
+    }
 }
 
 // -----------------------------------------------------------------------------
@@ -123,7 +129,7 @@ GUIEngine::EventPropagation CustomVideoSettingsDialog::processEvent(const std::s
         UserConfigParams::m_motionblur      =
             advanced_pipeline && getWidget<CheckBoxWidget>("motionblur")->getState();
 
-        if (advanced_pipeline)
+        if (advanced_pipeline && irr_driver->supportGeometryShader())
         {
             UserConfigParams::m_shadows =
                 getWidget<SpinnerWidget>("shadows")->getValue();
@@ -143,7 +149,8 @@ GUIEngine::EventPropagation CustomVideoSettingsDialog::processEvent(const std::s
             advanced_pipeline && getWidget<CheckBoxWidget>("lightshaft")->getState();
 
         UserConfigParams::m_gi =
-            advanced_pipeline && getWidget<CheckBoxWidget>("global_illumination")->getState();
+            advanced_pipeline && irr_driver->supportGeometryShader() &&
+            getWidget<CheckBoxWidget>("global_illumination")->getState();
 
         UserConfigParams::m_glow =
             advanced_pipeline && getWidget<CheckBoxWidget>("glow")->getState();
@@ -236,5 +243,11 @@ void CustomVideoSettingsDialog::updateActivation()
         getWidget<CheckBoxWidget>("glow")->setDeactivated();
         getWidget<CheckBoxWidget>("bloom")->setDeactivated();
     }
+
+    if (!irr_driver->supportGeometryShader())
+    {
+        getWidget<SpinnerWidget>("shadows")->setDeactivated();
+        getWidget<CheckBoxWidget>("global_illumination")->setDeactivated();
+    }
 }   // updateActivation