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/mixin/MixinShaderRenderGlobal.java

@@ -0,0 +1,40 @@
+package com.replaymod.compat.shaders.mixin;
+
+import com.replaymod.compat.shaders.ShaderReflection;
+import com.replaymod.render.hooks.EntityRendererHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.RenderGlobal;
+import net.minecraft.client.renderer.culling.ICamera;
+import net.minecraft.entity.Entity;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(RenderGlobal.class)
+public abstract class MixinShaderRenderGlobal {
+
+    private final Minecraft mc = Minecraft.getMinecraft();
+
+    @Shadow
+    public boolean displayListEntitiesDirty;
+
+    @Inject(method = "setupTerrain", at = @At("HEAD"), cancellable = true)
+    public void replayModCompat_setupTerrain(Entity viewEntity, double partialTicks, ICamera camera,
+                                             int frameCount, boolean playerSpectator, CallbackInfo ci) {
+        if (((EntityRendererHandler.IEntityRenderer) mc.entityRenderer).replayModRender_getHandler() == null) return;
+        if (ShaderReflection.shaders_isShadowPass == null) return;
+
+        // when called by the shadow pass, displayListEntitiesDirty can't be set to false, as no chunk updates
+        // are being processed. As it's being set to true by ChunkLoadingRenderGlobal#updateChunks, we have to
+        // set it to false manually to exit the loop imposed by MixinRenderGlobal#replayModRender_setupTerrain.
+        try {
+            if ((boolean) ShaderReflection.shaders_isShadowPass.get(null) == true) {
+                displayListEntitiesDirty = false;
+            }
+        } catch (IllegalAccessException ignore) {}
+
+    }
+
+}