From 2fecda7bdc0ae74ccc2a2ac86ff29f52353d761e Mon Sep 17 00:00:00 2001
From: Alan Eneev <aeneev@google.com>
Date: Thu, 28 Jul 2022 14:51:32 -0700
Subject: [PATCH] Headless EGL: Fallback to a 24-bit depth buffer

---
 .../src/opengl/platforms/PlatformEGLHeadless.cpp      | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/filament/backend/src/opengl/platforms/PlatformEGLHeadless.cpp b/filament/backend/src/opengl/platforms/PlatformEGLHeadless.cpp
index 8d8bf5f899..177fc71d06 100644
--- a/filament/backend/src/opengl/platforms/PlatformEGLHeadless.cpp
+++ b/filament/backend/src/opengl/platforms/PlatformEGLHeadless.cpp
@@ -138,6 +138,17 @@ backend::Driver* PlatformEGLHeadless::createDriver(void* sharedContext, const Pl
         goto error;
     }
 
+    // fallback to a 24-bit depth buffer
+    if (configsCount == 0) {
+        configAttribs[10] = EGL_DEPTH_SIZE;
+        configAttribs[11] = 24;
+
+        if (!eglChooseConfig(mEGLDisplay, configAttribs, &mEGLConfig, 1, &configsCount)) {
+            logEglError("eglChooseConfig");
+            goto error;
+        }
+    }
+
     // find a transparent config
     configAttribs[8] = EGL_ALPHA_SIZE;
     configAttribs[9] = 8;