Add Optifine compatibility to rendering by disabling their separate chunk loading queue

Add compatibility to shaders that utilize the Shadow Map by manually setting displayListEntitiesDirty to false
Call Shaders.beginRender in an Event Handler to avoid calling all of EntityRenderer#renderWorld

src/main/java/com/replaymod/compat/shaders/ShaderBeginRender.java

@@ -0,0 +1,39 @@
+package com.replaymod.compat.shaders;
+
+import com.replaymod.render.hooks.EntityRendererHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraftforge.fml.common.eventhandler.SubscribeEvent;
+import net.minecraftforge.fml.common.gameevent.TickEvent;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class ShaderBeginRender {
+
+    private final Minecraft mc = Minecraft.getMinecraft();
+
+    /**
+     *  Invokes Shaders#beginRender when rendering a video,
+     *  as this would usually get called by EntityRenderer#renderWorld,
+     *  which we're not calling during rendering.
+     */
+    @SubscribeEvent
+    public void onRenderTickStart(TickEvent.RenderTickEvent event) {
+        if (event.phase != TickEvent.Phase.START) return;
+        if (ShaderReflection.shaders_beginRender == null) return;
+        if (ShaderReflection.config_isShaders == null) return;
+
+        try {
+            // check if video is being rendered
+            if (((EntityRendererHandler.IEntityRenderer) mc.entityRenderer).replayModRender_getHandler() == null)
+                return;
+
+            // check if Shaders are enabled
+            if (!(boolean) (ShaderReflection.config_isShaders.invoke(null))) return;
+
+            ShaderReflection.shaders_beginRender.invoke(null, mc, mc.timer.elapsedPartialTicks, 0);
+        } catch (IllegalAccessException | InvocationTargetException e) {
+            e.printStackTrace();
+        }
+    }
+
+}