From 68eb0ce3f17ee1ce2e60751212824b31afb1a8ec Mon Sep 17 00:00:00 2001
From: Lucas Leandro <66079160+lucasleandro1805@users.noreply.github.com>
Date: Mon, 5 Jan 2026 16:44:54 -0300
Subject: [PATCH] Add java bindings for changing from default to screen-space
 reflection in real-time MaterialBuilder (#9548)

---
 .../filamat-android/src/main/cpp/MaterialBuilder.cpp |  7 +++++++
 .../android/filament/filamat/MaterialBuilder.java    | 12 ++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/android/filamat-android/src/main/cpp/MaterialBuilder.cpp b/android/filamat-android/src/main/cpp/MaterialBuilder.cpp
index c17505e284..31f1ad2010 100644
--- a/android/filamat-android/src/main/cpp/MaterialBuilder.cpp
+++ b/android/filamat-android/src/main/cpp/MaterialBuilder.cpp
@@ -335,6 +335,13 @@ Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderRefract
     builder->refractionMode((MaterialBuilder::RefractionMode) mode);
 }
 
+extern "C" JNIEXPORT void JNICALL
+Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderReflectionMode(JNIEnv* env,
+        jclass, jlong nativeBuilder, jint mode) {
+    auto builder = (MaterialBuilder*) nativeBuilder;
+    builder->reflectionMode((MaterialBuilder::ReflectionMode) mode);
+}
+
 extern "C" JNIEXPORT void JNICALL
 Java_com_google_android_filament_filamat_MaterialBuilder_nMaterialBuilderRefractionType(JNIEnv* env,
         jclass, jlong nativeBuilder, jint type) {
diff --git a/android/filamat-android/src/main/java/com/google/android/filament/filamat/MaterialBuilder.java b/android/filamat-android/src/main/java/com/google/android/filament/filamat/MaterialBuilder.java
index 2a3545131c..ec8a48b0e5 100644
--- a/android/filamat-android/src/main/java/com/google/android/filament/filamat/MaterialBuilder.java
+++ b/android/filamat-android/src/main/java/com/google/android/filament/filamat/MaterialBuilder.java
@@ -177,6 +177,11 @@ public class MaterialBuilder {
         SCREEN_SPACE
     }
 
+    public enum ReflectionMode {
+        DEFAULT,
+        SCREEN_SPACE
+    }
+
     public enum RefractionType {
         SOLID,
         THIN
@@ -403,6 +408,12 @@ public class MaterialBuilder {
         return this;
     }
 
+    @NonNull
+    public MaterialBuilder reflectionMode(ReflectionMode mode) {
+        nMaterialBuilderReflectionMode(mNativeObject, mode.ordinal());
+        return this;
+    }
+
     @NonNull
     public MaterialBuilder refractionType(RefractionType type) {
         nMaterialBuilderRefractionType(mNativeObject, type.ordinal());
@@ -604,6 +615,7 @@ public class MaterialBuilder {
     private static native void nMaterialBuilderSpecularAntiAliasingThreshold(long mNativeObject,
             float threshold);
     private static native void nMaterialBuilderRefractionMode(long nativeBuilder, int mode);
+    private static native void nMaterialBuilderReflectionMode(long nativeBuilder, int mode);
     private static native void nMaterialBuilderRefractionType(long nativeBuilder, int type);
     private static native void nMaterialBuilderClearCoatIorChange(long mNativeObject,
             boolean clearCoatIorChange);