Backport https://github.com/glfw/glfw/commit/6281f498c875f49d8ac5c5a02d968fb1792fd9f5

glfw/egl_context.c

@@ -428,6 +428,8 @@ bool _glfwInitEGL(void)
         extensionSupportedEGL("EGL_KHR_get_all_proc_addresses");
     _glfw.egl.KHR_context_flush_control =
         extensionSupportedEGL("EGL_KHR_context_flush_control");
+    _glfw.egl.EXT_present_opaque =
+        extensionSupportedEGL("EGL_EXT_present_opaque");
 
     return true;
 }
@@ -598,6 +600,8 @@ bool _glfwCreateContextEGL(_GLFWwindow* window,
         if (_glfw.egl.KHR_gl_colorspace)
             setAttrib(EGL_GL_COLORSPACE_KHR, EGL_GL_COLORSPACE_SRGB_KHR);
     }
+    if (_glfw.egl.EXT_present_opaque)
+        setAttrib(EGL_PRESENT_OPAQUE_EXT, !fbconfig->transparent);
 
     setAttrib(EGL_NONE, EGL_NONE);
 

glfw/egl_context.h

@@ -186,6 +186,7 @@ typedef struct _GLFWlibraryEGL
     bool            EXT_platform_base;
     bool            EXT_platform_x11;
     bool            EXT_platform_wayland;
+    bool            EXT_present_opaque;
     bool            ANGLE_platform_angle;
     bool            ANGLE_platform_angle_opengl;
     bool            ANGLE_platform_angle_d3d;

glfw/internal.h

@@ -52,6 +52,8 @@
 #define GLFW_INCLUDE_NONE
 #include "glfw3.h"
 
+#define EGL_PRESENT_OPAQUE_EXT 0x31df
+
 #define _GLFW_INSERT_FIRST      0
 #define _GLFW_INSERT_LAST       1