From 1626d7a51a0170fac3a54bca2f736eb50147fb77 Mon Sep 17 00:00:00 2001
From: Xaver Hugl <xaver.hugl@gmail.com>
Date: Wed, 27 Oct 2021 11:45:06 +0200
Subject: [PATCH] platforms/drm: only use glDrawBuffer with desktop GL

That function is not available with GLES, and calling it is only necessary
for NVidia.
---
 src/plugins/platforms/drm/egl_gbm_backend.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/plugins/platforms/drm/egl_gbm_backend.cpp b/src/plugins/platforms/drm/egl_gbm_backend.cpp
index 776967c9a8..0ab9b6d592 100644
--- a/src/plugins/platforms/drm/egl_gbm_backend.cpp
+++ b/src/plugins/platforms/drm/egl_gbm_backend.cpp
@@ -359,7 +359,9 @@ bool EglGbmBackend::makeContextCurrent(const Output::RenderData &render) const
         qCCritical(KWIN_DRM) << "eglMakeCurrent failed:" << getEglErrorString();
         return false;
     }
-    glDrawBuffer(GL_BACK);
+    if (!GLPlatform::instance()->isGLES()) {
+        glDrawBuffer(GL_BACK);
+    }
     return true;
 }