From 8f3fa2e7f27f55c9a30a495e4baa2e48ba816e33 Mon Sep 17 00:00:00 2001
From: mcrcortex <18544518+MCRcortex@users.noreply.github.com>
Date: Sun, 6 Jul 2025 20:01:44 +1000
Subject: [PATCH] start on no subgroup impl

---
 src/main/java/me/cortex/voxy/client/VoxyClient.java          | 5 +++++
 .../java/me/cortex/voxy/client/core/gl/Capabilities.java     | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/src/main/java/me/cortex/voxy/client/VoxyClient.java b/src/main/java/me/cortex/voxy/client/VoxyClient.java
index c2ad1803..aa070675 100644
--- a/src/main/java/me/cortex/voxy/client/VoxyClient.java
+++ b/src/main/java/me/cortex/voxy/client/VoxyClient.java
@@ -29,6 +29,11 @@ public class VoxyClient implements ClientModInitializer {
                 BudgetBufferRenderer.init();
 
                 VoxyCommon.setInstanceFactory(VoxyClientInstance::new);
+
+                if (!Capabilities.INSTANCE.subgroup) {
+                    Logger.warn("GPU does not support subgroup operations, expect some performance degradation");
+                }
+
             } else {
                 Logger.error("Voxy is unsupported on your system.");
             }
diff --git a/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java b/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
index 95e3b8a0..9b6e9584 100644
--- a/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
+++ b/src/main/java/me/cortex/voxy/client/core/gl/Capabilities.java
@@ -24,10 +24,12 @@ public class Capabilities {
     public final boolean compute;
     public final boolean indirectParameters;
     public final boolean isIntel;
+    public final boolean subgroup;
 
     public Capabilities() {
         var cap = GL.getCapabilities();
         this.compute = cap.glDispatchComputeIndirect != 0;
+        this.subgroup = cap.GL_KHR_shader_subgroup;
         this.indirectParameters = cap.glMultiDrawElementsIndirectCountARB != 0;
         this.repFragTest = cap.GL_NV_representative_fragment_test;
         this.meshShaders = cap.GL_NV_mesh_shader;