Refactor to just "Blur"

src/main/java/com/tterrag/blur/Blur.java

@@ -0,0 +1,143 @@
+package com.tterrag.blur;
+
+import java.io.File;
+import java.lang.reflect.Field;
+import java.util.List;
+
+import org.apache.commons.lang3.ArrayUtils;
+
+import com.google.common.base.Throwables;
+
+import static com.tterrag.blur.Blur.*;
+
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.gui.GuiChat;
+import net.minecraft.client.renderer.EntityRenderer;
+import net.minecraft.client.shader.Shader;
+import net.minecraft.client.shader.ShaderGroup;
+import net.minecraft.client.shader.ShaderUniform;
+import net.minecraft.util.ResourceLocation;
+import net.minecraftforge.client.event.GuiOpenEvent;
+import net.minecraftforge.common.MinecraftForge;
+import net.minecraftforge.common.config.Configuration;
+import net.minecraftforge.fml.client.event.ConfigChangedEvent.OnConfigChangedEvent;
+import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.common.Mod.EventHandler;
+import net.minecraftforge.fml.common.Mod.Instance;
+import net.minecraftforge.fml.common.event.FMLPreInitializationEvent;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent.Phase;
+import net.minecraftforge.fml.common.gameevent.TickEvent.RenderTickEvent;
+import net.minecraftforge.fml.relauncher.ReflectionHelper;
+
+@Mod(modid = MODID, name = MOD_NAME, version = VERSION, acceptedMinecraftVersions = "[1.9, 1.12)", clientSideOnly = true, guiFactory = "com.tterrag.blurbg.config.BlurGuiFactory")
+public class Blur {
+    
+    public static final String MODID = "blur";
+    public static final String MOD_NAME = "Blur";
+    public static final String VERSION = "@VERSION@";
+    
+    @Instance
+    public static Blur instance;
+    
+    public Configuration config;
+    
+    private String[] blurExclusions;
+
+    private Field _listShaders;
+    private long start;
+    private int fadeTime;
+    
+    private int colorFirst, colorSecond;
+    
+    @EventHandler
+    public void preInit(FMLPreInitializationEvent event) {
+        MinecraftForge.EVENT_BUS.register(this);
+        
+        config = new Configuration(new File(event.getModConfigurationDirectory(), "blur.cfg"));
+        saveConfig();
+    }
+    
+    private void saveConfig() {
+        
+        blurExclusions = config.getStringList("guiExclusions", Configuration.CATEGORY_GENERAL, new String[] {
+                GuiChat.class.getName(),
+        }, "A list of classes to be excluded from the blur shader.");
+        
+        fadeTime = config.getInt("fadeTime", Configuration.CATEGORY_GENERAL, 200, 0, Integer.MAX_VALUE, "The time it takes for the blur to fade in, in ms.");
+        
+        colorFirst = Integer.parseUnsignedInt(
+                config.getString("gradientStartColor",  Configuration.CATEGORY_GENERAL, "66000000", "The start color of the background gradient. Given in ARGB hex."),
+                16
+        );
+        
+        colorSecond = Integer.parseUnsignedInt(
+                config.getString("gradientEndColor",    Configuration.CATEGORY_GENERAL, "66000000", "The end color of the background gradient. Given in ARGB hex."),
+                16
+        );
+        
+        config.save();
+    }
+    
+    @SubscribeEvent
+    public void onConfigChanged(OnConfigChangedEvent event) {
+        if (event.getModID().equals(MODID)) {
+            saveConfig();
+        }
+    }
+    
+    @SuppressWarnings("null")
+    @SubscribeEvent
+    public void onGuiChange(GuiOpenEvent event) {
+        if (_listShaders == null) {
+            _listShaders = ReflectionHelper.findField(ShaderGroup.class, "field_148031_d", "listShaders");
+        }
+        if (Minecraft.getMinecraft().world != null) {
+            EntityRenderer er = Minecraft.getMinecraft().entityRenderer;
+            if (!er.isShaderActive() && event.getGui() != null && !ArrayUtils.contains(blurExclusions, event.getGui().getClass().getName())) {
+                er.loadShader(new ResourceLocation("shaders/post/fade_in_blur.json"));
+                start = System.currentTimeMillis();
+            } else if (er.isShaderActive() && event.getGui() == null) {
+                er.stopUseShader();
+            }
+        }
+    }
+    
+    private float getProgress() {
+        return Math.min((System.currentTimeMillis() - start) / (float) fadeTime, 1);
+    }
+    
+    @SuppressWarnings("null")
+    @SubscribeEvent
+    public void onRenderTick(RenderTickEvent event) {
+        if (event.phase == Phase.END && Minecraft.getMinecraft().currentScreen != null && Minecraft.getMinecraft().entityRenderer.isShaderActive()) {
+            ShaderGroup sg = Minecraft.getMinecraft().entityRenderer.getShaderGroup();
+            try {
+                @SuppressWarnings("unchecked")
+                List<Shader> shaders = (List<Shader>) _listShaders.get(sg);
+                for (Shader s : shaders) {
+                    ShaderUniform su = s.getShaderManager().getShaderUniform("Progress");
+                    if (su != null) {
+                        su.set(getProgress());
+                    }
+                }
+            } catch (IllegalArgumentException | IllegalAccessException e) {
+                Throwables.propagate(e);
+            }
+        }
+    }
+    
+    public static int getBackgroundColor(boolean second) {
+        int color = second ? instance.colorSecond : instance.colorFirst;
+        int a = color >> 24;
+        int r = (color >> 16) & 0xFF;
+        int b = (color >> 8) & 0xFF;
+        int g = color & 0xFF;
+        float prog = instance.getProgress();
+        a *= prog;
+        r *= prog;
+        g *= prog;
+        b *= prog;
+        return a << 24 | r << 16 | b << 8 | g;
+    }
+}