added force PPL checkbox

apps/launcher/settingspage.cpp

@@ -252,6 +252,7 @@ bool Launcher::SettingsPage::loadSettings()
         lightFadeMultiplierSpinBox->setValue(Settings::shaders().mLightFadeStart);
         lightsBoundingSphereMultiplierSpinBox->setValue(Settings::shaders().mLightBoundsMultiplier);
         lightsMinimumInteriorBrightnessSpinBox->setValue(Settings::shaders().mMinimumInteriorBrightness);
+        loadSettingBool(Settings::shaders().mForcePerPixelLighting, *forcePPLCheckBox);
 
         connect(lightingMethodComboBox, qOverload<int>(&QComboBox::currentIndexChanged), this,
             &SettingsPage::slotLightTypeCurrentIndexChanged);
@@ -470,6 +471,7 @@ void Launcher::SettingsPage::saveSettings()
         Settings::shaders().mLightFadeStart.set(lightFadeMultiplierSpinBox->value());
         Settings::shaders().mLightBoundsMultiplier.set(lightsBoundingSphereMultiplierSpinBox->value());
         Settings::shaders().mMinimumInteriorBrightness.set(lightsMinimumInteriorBrightnessSpinBox->value());
+        saveSettingBool(*forcePPLCheckBox, Settings::shaders().mForcePerPixelLighting);
     }
 
     // Audio

apps/launcher/ui/settingspage.ui

@@ -1028,7 +1028,7 @@
                  </property>
                 </widget>
                </item>
-               <item row="8" column="1">
+               <item row="9" column="1">
                 <spacer name="verticalSpacer_10">
                  <property name="orientation">
                   <enum>Qt::Vertical</enum>
@@ -1103,6 +1103,16 @@
                  </property>
                 </widget>
                </item>
+               <item row="8" column="0">
+                <widget class="QCheckBox" name="forcePPLCheckBox">
+                 <property name="toolTip">
+                  <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;If true, force per-pixel lighting.&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+                 </property>
+                 <property name="text">
+                  <string>Force per-pixel lighting</string>
+                 </property>
+                </widget>
+               </item>
                <item row="7" column="0">
                 <widget class="QLabel" name="lightsMinimumInteriorBrightnessLabel">
                  <property name="toolTip">