Partial compatibility with vivecraft

src/main/java/me/cortex/voxy/client/core/ViewportSelector.java

@@ -0,0 +1,45 @@
+package me.cortex.voxy.client.core;
+
+import me.cortex.voxy.client.core.rendering.AbstractFarWorldRenderer;
+import me.cortex.voxy.client.core.rendering.Viewport;
+import net.fabricmc.loader.api.FabricLoader;
+import org.vivecraft.client_vr.ClientDataHolderVR;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.function.Supplier;
+
+public class ViewportSelector <T extends Viewport> {
+    public static final boolean VIVECRAFT_INSTALLED = FabricLoader.getInstance().isModLoaded("vivecraft");
+
+    private final Supplier<T> creator;
+    private final T defaultViewport;
+    private final Map<Object, T> extraViewports = new HashMap<>();
+
+    public ViewportSelector(Supplier<T> viewportCreator) {
+        this.creator = viewportCreator;
+        this.defaultViewport = viewportCreator.get();
+    }
+
+    private T getVivecraftViewport() {
+        var cdh = ClientDataHolderVR.getInstance();
+        var pass = cdh.currentPass;
+        if (pass == null) {
+            return this.defaultViewport;
+        }
+        return this.extraViewports.computeIfAbsent(pass, a->this.creator.get());
+    }
+
+    public T getViewport() {
+        if (VIVECRAFT_INSTALLED) {
+            return getVivecraftViewport();
+        }
+        return this.defaultViewport;
+    }
+
+    public void free() {
+        this.defaultViewport.delete();
+        this.extraViewports.values().forEach(Viewport::delete);
+        this.extraViewports.clear();
+    }
+}

src/main/java/me/cortex/voxy/client/core/VoxelCore.java

@@ -49,7 +49,7 @@ public class VoxelCore {
     private final RenderTracker renderTracker;
 
     private final AbstractFarWorldRenderer renderer;
-    private Viewport viewport;
+    private final ViewportSelector viewportSelector;
     private final PostProcessing postProcessing;
 
     //private final Thread shutdownThread = new Thread(this::shutdown);
@@ -62,7 +62,7 @@ public class VoxelCore {
         //Trigger the shared index buffer loading
         SharedIndexBuffer.INSTANCE.id();
         this.renderer = new Gl46FarWorldRenderer(VoxyConfig.CONFIG.geometryBufferSize, VoxyConfig.CONFIG.maxSections);
-        this.viewport = this.renderer.createViewport();
+        this.viewportSelector = new ViewportSelector<>(this.renderer::createViewport);
         System.out.println("Renderer initialized");
 
         this.renderTracker = new RenderTracker(this.world, this.renderer);
@@ -155,12 +155,13 @@ public class VoxelCore {
         //fb.bind();
 
         var projection = computeProjectionMat();
-        this.viewport.setProjection(projection).setModelView(matrices.peek().getPositionMatrix()).setCamera(cameraX, cameraY, cameraZ);
+        var viewport = this.viewportSelector.getViewport();
+        viewport.setProjection(projection).setModelView(matrices.peek().getPositionMatrix()).setCamera(cameraX, cameraY, cameraZ);
 
         int boundFB = GL11.glGetInteger(GL_DRAW_FRAMEBUFFER_BINDING);
         this.postProcessing.setup(MinecraftClient.getInstance().getFramebuffer().textureWidth, MinecraftClient.getInstance().getFramebuffer().textureHeight, boundFB);
 
-        this.renderer.renderFarAwayOpaque(this.viewport);
+        this.renderer.renderFarAwayOpaque(viewport);
 
         //Compute the SSAO of the rendered terrain
         this.postProcessing.computeSSAO(projection, matrices);
@@ -199,7 +200,7 @@ public class VoxelCore {
         System.out.println("Render gen shut down");
         try {this.world.shutdown();} catch (Exception e) {System.err.println(e);}
         System.out.println("World engine shut down");
-        try {this.renderer.shutdown(); if (viewport!=null)this.viewport.delete();} catch (Exception e) {System.err.println(e);}
+        try {this.renderer.shutdown(); this.viewportSelector.free();} catch (Exception e) {System.err.println(e);}
         System.out.println("Renderer shut down");
         if (this.postProcessing!=null){try {this.postProcessing.shutdown();} catch (Exception e) {System.err.println(e);}}
         System.out.println("Voxel core shut down");