From 6bbd2c521aacec49135a23e435cf05420ae1953b Mon Sep 17 00:00:00 2001
From: mcrcortex <18544518+MCRcortex@users.noreply.github.com>
Date: Tue, 3 Jun 2025 22:14:46 +1000
Subject: [PATCH] Use representitive fragment when possible

---
 .../java/me/cortex/voxy/client/core/gl/Capabilities.java  | 4 +++-
 .../core/rendering/section/MDICSectionRenderer.java       | 8 ++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)

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 92608dba..95e3b8a0 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
@@ -13,6 +13,7 @@ public class Capabilities {
 
     public static final Capabilities INSTANCE = new Capabilities();
 
+    public final boolean repFragTest;
     public final boolean meshShaders;
     public final boolean INT64_t;
     public final long ssboMaxSize;
@@ -28,7 +29,8 @@ public class Capabilities {
         var cap = GL.getCapabilities();
         this.compute = cap.glDispatchComputeIndirect != 0;
         this.indirectParameters = cap.glMultiDrawElementsIndirectCountARB != 0;
-        this.meshShaders = cap.GL_NV_mesh_shader && cap.GL_NV_representative_fragment_test;
+        this.repFragTest = cap.GL_NV_representative_fragment_test;
+        this.meshShaders = cap.GL_NV_mesh_shader;
         this.canQueryGpuMemory = cap.GL_NVX_gpu_memory_info;
         //this.INT64_t = cap.GL_ARB_gpu_shader_int64 || cap.GL_AMD_gpu_shader_int64;
         //The only reliable way to test for int64 support is to try compile a shader
diff --git a/src/main/java/me/cortex/voxy/client/core/rendering/section/MDICSectionRenderer.java b/src/main/java/me/cortex/voxy/client/core/rendering/section/MDICSectionRenderer.java
index 1c1a6f7d..e1a68ed1 100644
--- a/src/main/java/me/cortex/voxy/client/core/rendering/section/MDICSectionRenderer.java
+++ b/src/main/java/me/cortex/voxy/client/core/rendering/section/MDICSectionRenderer.java
@@ -2,6 +2,7 @@ package me.cortex.voxy.client.core.rendering.section;
 
 
 import me.cortex.voxy.client.RenderStatistics;
+import me.cortex.voxy.client.core.gl.Capabilities;
 import me.cortex.voxy.client.core.gl.GlBuffer;
 import me.cortex.voxy.client.core.gl.GlTexture;
 import me.cortex.voxy.client.core.gl.shader.Shader;
@@ -34,6 +35,7 @@ import static org.lwjgl.opengl.GL42.glMemoryBarrier;
 import static org.lwjgl.opengl.GL43.*;
 import static org.lwjgl.opengl.GL45.glBindTextureUnit;
 import static org.lwjgl.opengl.GL45.glClearNamedBufferData;
+import static org.lwjgl.opengl.NVRepresentativeFragmentTest.GL_REPRESENTATIVE_FRAGMENT_TEST_NV;
 
 //Uses MDIC to render the sections
 public class MDICSectionRenderer extends AbstractSectionRenderer<MDICViewport, BasicSectionGeometryData> {
@@ -203,6 +205,9 @@ public class MDICSectionRenderer extends AbstractSectionRenderer<MDICViewport, B
 
         {//Test occlusion
             this.cullShader.bind();
+            if (Capabilities.INSTANCE.repFragTest) {
+                glEnable(GL_REPRESENTATIVE_FRAGMENT_TEST_NV);
+            }
             glBindVertexArray(RenderService.STATIC_VAO);
             glBindBufferBase(GL_UNIFORM_BUFFER, 0, this.uniform.id);
             glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 1, this.geometryManager.getMetadataBuffer().id);
@@ -218,6 +223,9 @@ public class MDICSectionRenderer extends AbstractSectionRenderer<MDICViewport, B
             glDepthMask(true);
             glColorMask(true, true, true, true);
             glDisable(GL_DEPTH_TEST);
+            if (Capabilities.INSTANCE.repFragTest) {
+                glDisable(GL_REPRESENTATIVE_FRAGMENT_TEST_NV);
+            }
         }