Added ugly hack, which forces srgb-capable framebuffer creation for intel drivers on linux

data/graphical_restrictions.xml

@@ -4,6 +4,7 @@
   <card is="Intel(R) HD Graphics 3000" os="windows"                disable="AdvancedPipeline"/>
   <card is="Intel(R) HD Graphics 3000" os="windows"                disable="FramebufferSRGBWorking"/>
   <card contains="Intel"          os="osx"                         disable="GI"/>
+  <card contains="Intel"          os="linux"    version="<12.0"    disable="FramebufferSRGBCapable"/>
   <card contains="Intel"                                           disable="TextureCompressionS3TC"/>
   <card contains="Intel"          os="windows"                     disable="HighDefinitionTextures"/>
   <card contains="NVIDIA"         os="windows"  version="<344.65"  disable="BufferStorage"/>

src/graphics/graphics_restrictions.cpp

@@ -59,6 +59,7 @@ namespace GraphicsRestrictions
             "HighDefinitionTextures",
             "AdvancedPipeline",
             "FramebufferSRGBWorking",
+            "FramebufferSRGBCapable",
             "GI",
         };
     }   // namespace Private

src/graphics/graphics_restrictions.hpp

@@ -53,6 +53,7 @@ namespace GraphicsRestrictions
         GR_HIGHDEFINITION_TEXTURES,
         GR_ADVANCED_PIPELINE,
         GR_FRAMEBUFFER_SRGB_WORKING,
+        GR_FRAMEBUFFER_SRGB_CAPABLE,
         GR_GI,
         GR_COUNT  /** MUST be last entry. */
     } ;

src/graphics/irr_driver.cpp

@@ -346,6 +346,8 @@ void IrrDriver::createListOfVideoModes()
  */
 void IrrDriver::initDevice()
 {
+    SIrrlichtCreationParameters params;
+    
     // If --no-graphics option was used, the null device can still be used.
     if (!ProfileWorld::isNoGraphics())
     {
@@ -428,7 +430,6 @@ void IrrDriver::initDevice()
         m_device->drop();
         m_device  = NULL;
 
-        SIrrlichtCreationParameters params;
         params.ForceLegacyDevice = (UserConfigParams::m_force_legacy_device || 
             UserConfigParams::m_gamepad_visualisation);
 
@@ -509,6 +510,28 @@ void IrrDriver::initDevice()
         Log::fatal("irr_driver", "Couldn't initialise irrlicht device. Quitting.\n");
     }
     
+    CVS->init();
+    
+    // This is the ugly hack for intel driver on linux, which doesn't
+    // use sRGB-capable visual, even if we request it. This causes
+    // the screen to be darker than expected. Setting WithAlphaChannel
+    // to true forces using the proper format on mesa side.
+    if (!ProfileWorld::isNoGraphics() && GraphicsRestrictions::isDisabled(
+                            GraphicsRestrictions::GR_FRAMEBUFFER_SRGB_CAPABLE))
+    {
+        m_device->closeDevice();
+        m_device->drop();
+
+        params.WithAlphaChannel = true;
+        
+        m_device = createDeviceEx(params);
+        
+        if(!m_device)
+        {
+            Log::fatal("irr_driver", "Couldn't initialise irrlicht device. Quitting.\n");
+        }
+    }
+
     m_scene_manager = m_device->getSceneManager();
     m_gui_env       = m_device->getGUIEnvironment();
     m_video_driver  = m_device->getVideoDriver();
@@ -516,8 +539,6 @@ void IrrDriver::initDevice()
 
     m_actual_screen_size = m_video_driver->getCurrentRenderTargetSize();
 
-    CVS->init();
-
     m_spherical_harmonics = new SphericalHarmonics(m_scene_manager->getAmbientLight().toSColor());
 
     if (UserConfigParams::m_shadows_resolution != 0 &&