From 75a9df969bd904cf6242f0f0284f2a0a216668c1 Mon Sep 17 00:00:00 2001
From: mcrcortex <18544518+MCRcortex@users.noreply.github.com>
Date: Wed, 3 Sep 2025 14:51:42 +1000
Subject: [PATCH] Support render scaling factor in shaders

---
 .../voxy/client/core/AbstractRenderPipeline.java      |  3 +++
 .../voxy/client/core/IrisVoxyRenderPipeline.java      |  7 ++++++-
 .../me/cortex/voxy/client/core/VoxyRenderSystem.java  |  8 ++++++++
 .../me/cortex/voxy/client/iris/IrisShaderPatch.java   | 11 +++++++++++
 .../voxy/client/iris/IrisVoxyRenderPipelineData.java  |  8 +++-----
 5 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/main/java/me/cortex/voxy/client/core/AbstractRenderPipeline.java b/src/main/java/me/cortex/voxy/client/core/AbstractRenderPipeline.java
index 9ba5d7bc..3dc9b056 100644
--- a/src/main/java/me/cortex/voxy/client/core/AbstractRenderPipeline.java
+++ b/src/main/java/me/cortex/voxy/client/core/AbstractRenderPipeline.java
@@ -215,4 +215,7 @@ public abstract class AbstractRenderPipeline extends TrackedObject {
         return null;
     }
 
+    //Null means no scaling factor
+    public float[] getRenderScalingFactor() {return null;}
+
 }
diff --git a/src/main/java/me/cortex/voxy/client/core/IrisVoxyRenderPipeline.java b/src/main/java/me/cortex/voxy/client/core/IrisVoxyRenderPipeline.java
index 4ab8e5a0..d23121d6 100644
--- a/src/main/java/me/cortex/voxy/client/core/IrisVoxyRenderPipeline.java
+++ b/src/main/java/me/cortex/voxy/client/core/IrisVoxyRenderPipeline.java
@@ -227,8 +227,13 @@ public class IrisVoxyRenderPipeline extends AbstractRenderPipeline {
         }
 
         builder.append("vec2 ").append(functionName).append("()\n");
-        builder.append(this.data.getTAAOffset());
+        builder.append(this.data.TAA);
         builder.append("\n");
         return builder.toString();
     }
+
+    @Override
+    public float[] getRenderScalingFactor() {
+        return this.data.resolutionScale;
+    }
 }
diff --git a/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java b/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
index ede4b575..bad3eab8 100644
--- a/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
+++ b/src/main/java/me/cortex/voxy/client/core/VoxyRenderSystem.java
@@ -174,6 +174,14 @@ public class VoxyRenderSystem {
         int width = dims[2];
         int height = dims[3];
 
+        {//Apply render scaling factor
+            var factor = this.pipeline.getRenderScalingFactor();
+            if (factor != null) {
+                width = (int) (width*factor[0]);
+                height = (int) (height*factor[1]);
+            }
+        }
+
         viewport
                 .setVanillaProjection(matrices.projection())
                 .setProjection(projection)
diff --git a/src/main/java/me/cortex/voxy/client/iris/IrisShaderPatch.java b/src/main/java/me/cortex/voxy/client/iris/IrisShaderPatch.java
index c164fc87..a1c8e451 100644
--- a/src/main/java/me/cortex/voxy/client/iris/IrisShaderPatch.java
+++ b/src/main/java/me/cortex/voxy/client/iris/IrisShaderPatch.java
@@ -156,6 +156,7 @@ public class IrisShaderPatch {
         public Int2ObjectOpenHashMap<BlendState> blending;
         public String taaOffset;
         public boolean excludeLodsFromVanillaDepth;
+        public float[] renderScale;
         public boolean checkValid() {
             return this.opaqueDrawBuffers != null && this.translucentDrawBuffers != null && this.uniforms != null && this.opaquePatchData != null;
         }
@@ -209,6 +210,16 @@ public class IrisShaderPatch {
         return !this.patchData.excludeLodsFromVanillaDepth;
     }
 
+    public float[] getRenderScale() {
+        if (this.patchData.renderScale == null || this.patchData.renderScale.length==0) {
+            return new float[]{1,1};
+        }
+        if (this.patchData.renderScale.length == 1) {
+            return new float[]{this.patchData.renderScale[0],this.patchData.renderScale[0]};
+        }
+        return new float[]{Math.max(0.01f,this.patchData.renderScale[0]),Math.max(0.01f,this.patchData.renderScale[1])};
+    }
+
     public Runnable createBlendSetup() {
         if (this.patchData.blending == null || this.patchData.blending.isEmpty()) {
             return ()->{};//No blending change
diff --git a/src/main/java/me/cortex/voxy/client/iris/IrisVoxyRenderPipelineData.java b/src/main/java/me/cortex/voxy/client/iris/IrisVoxyRenderPipelineData.java
index 6f0c0b0a..50435f0d 100644
--- a/src/main/java/me/cortex/voxy/client/iris/IrisVoxyRenderPipelineData.java
+++ b/src/main/java/me/cortex/voxy/client/iris/IrisVoxyRenderPipelineData.java
@@ -47,7 +47,8 @@ public class IrisVoxyRenderPipelineData {
     private final ImageSet imageSet;
     private final SSBOSet ssboSet;
     public final boolean renderToVanillaDepth;
-    private final String TAA;
+    public final float[] resolutionScale;
+    public final String TAA;
     private IrisVoxyRenderPipelineData(IrisShaderPatch patch, int[] opaqueDrawTargets, int[] translucentDrawTargets, StructLayout uniformSet, Runnable blendingSetup, ImageSet imageSet, SSBOSet ssboSet) {
         this.opaqueDrawTargets = opaqueDrawTargets;
         this.translucentDrawTargets = translucentDrawTargets;
@@ -59,6 +60,7 @@ public class IrisVoxyRenderPipelineData {
         this.ssboSet = ssboSet;
         this.renderToVanillaDepth = patch.emitToVanillaDepth();
         this.TAA = patch.getTAAShift();
+        this.resolutionScale = patch.getRenderScale();
     }
 
     public SSBOSet getSsboSet() {
@@ -109,10 +111,6 @@ public class IrisVoxyRenderPipelineData {
         return targetTextures;
     }
 
-    public String getTAAOffset() {
-        return this.TAA;
-    }
-
     public record StructLayout(int size, String layout, LongConsumer updater) {}
     private static StructLayout createUniformLayoutStructAndUpdater(CachedUniform[] uniforms) {
         if (uniforms.length == 0) {