Fix only front-facing chunks visible for ODS rendering (fixes #67)

src/main/java/com/replaymod/render/mixin/MixinFrustum.java

@@ -0,0 +1,23 @@
+package com.replaymod.render.mixin;
+
+import com.replaymod.render.hooks.EntityRendererHandler;
+import net.minecraft.client.Minecraft;
+import net.minecraft.client.renderer.culling.Frustum;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfoReturnable;
+
+@Mixin(Frustum.class)
+public abstract class MixinFrustum {
+    @Inject(method = "isBoxInFrustum", at = @At("HEAD"), cancellable = true)
+    public void isBoxInFrustum(double minX, double minY, double minZ, double maxX, double maxY, double maxZ, CallbackInfoReturnable<Boolean> ci) {
+        EntityRendererHandler handler = ((EntityRendererHandler.IEntityRenderer) Minecraft.getMinecraft().entityRenderer).replayModRender_getHandler();
+        if (handler != null && handler.omnidirectional && handler.data == null) {
+            // Normally the camera is always facing the direction of the omnidirectional image face that is currently
+            // getting rendered. With ODS however, the camera is always facing forwards and the turning happens in the
+            // vertex shader (non-trivial due to stereo). As such, all chunks need to be rendered all the time for ODS.
+            ci.setReturnValue(true);
+        }
+    }
+}

src/main/resources/mixins.render.replaymod.json

@@ -4,6 +4,7 @@
   "mixins": [
     "MixinEffectRenderer",
     "MixinEntityRenderer",
+    "MixinFrustum",
     "MixinRender",
     "MixinRendererLivingEntity",
     "MixinRenderGlobal",