[PATCH 1/2] Use EGL device extension in display initialization.

[Eugene Huang <eugeneh@nvidia.com>]

Signed-off-by: Eugene Huang <eugeneh@nvidia.com>
---
 ui/egl-helpers.c | 41 +++++++++++++++++++++++++++++++++++++----
 1 file changed, 37 insertions(+), 4 deletions(-)

diff --git a/ui/egl-helpers.c b/ui/egl-helpers.c
index 6d0cb2b5cb..ce0971422b 100644
--- a/ui/egl-helpers.c
+++ b/ui/egl-helpers.c
@@ -1,6 +1,8 @@
 /*
  * Copyright (C) 2015-2016 Gerd Hoffmann <kraxel@redhat.com>
  *
+ * Copyright (c) 2021, NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
@@ -351,11 +353,26 @@ static EGLDisplay qemu_egl_get_display(EGLNativeDisplayType native,
     EGLDisplay dpy = EGL_NO_DISPLAY;
 
     /* In practise any EGL 1.5 implementation would support the EXT extension */
-    if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")) {
+    if (epoxy_has_egl_extension(NULL, "EGL_EXT_platform_base")
+        && epoxy_has_egl_extension(NULL, "EGL_EXT_platform_device")
+        && (epoxy_has_egl_extension(NULL, "EGL_EXT_device_base")
+        || epoxy_has_egl_extension(NULL, "EGL_EXT_device_enumeration"))) {
         PFNEGLGETPLATFORMDISPLAYEXTPROC getPlatformDisplayEXT =
             (void *) eglGetProcAddress("eglGetPlatformDisplayEXT");
         if (getPlatformDisplayEXT && platform != 0) {
-            dpy = getPlatformDisplayEXT(platform, native, NULL);
+            if (platform == EGL_PLATFORM_DEVICE_EXT) {
+                static const int MAX_DEVICES = 4;
+                EGLDeviceEXT eglDevs[MAX_DEVICES];
+                EGLint numDevices;
+
+                PFNEGLQUERYDEVICESEXTPROC eglQueryDevicesEXT =
+                    (PFNEGLQUERYDEVICESEXTPROC)
+                eglGetProcAddress("eglQueryDevicesEXT");
+                eglQueryDevicesEXT(MAX_DEVICES, eglDevs, &numDevices);
+                dpy = getPlatformDisplayEXT(platform, eglDevs[0], 0);
+            } else {
+                dpy = getPlatformDisplayEXT(platform, native, NULL);
+            }
         }
     }
 
@@ -388,6 +405,17 @@ static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
         EGL_ALPHA_SIZE, 0,
         EGL_NONE,
     };
+
+    static const EGLint conf_att_pbuffer[] = {
+        EGL_SURFACE_TYPE, EGL_PBUFFER_BIT,
+        EGL_RED_SIZE, 8,
+        EGL_GREEN_SIZE, 8,
+        EGL_BLUE_SIZE, 8,
+        EGL_DEPTH_SIZE, 1,
+        EGL_RENDERABLE_TYPE, EGL_OPENGL_BIT,
+        EGL_NONE
+    };
+
     EGLint major, minor;
     EGLBoolean b;
     EGLint n;
@@ -413,8 +441,8 @@ static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
     }
 
     b = eglChooseConfig(qemu_egl_display,
-                        gles ? conf_att_gles : conf_att_core,
-                        &qemu_egl_config, 1, &n);
+        gles ? conf_att_gles : (platform == EGL_PLATFORM_DEVICE_EXT ? conf_att_pbuffer : conf_att_core),
+        &qemu_egl_config, 1, &n);
     if (b == EGL_FALSE || n != 1) {
         error_report("egl: eglChooseConfig failed (%s mode)",
                      gles ? "gles" : "core");
@@ -436,6 +464,11 @@ int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 
 int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
 {
+    // Try EGL Device Extension
+    if (qemu_egl_init_dpy(dpy, EGL_PLATFORM_DEVICE_EXT, mode) == 0) {
+        return 0;
+    }
+
 #ifdef EGL_MESA_platform_gbm
     return qemu_egl_init_dpy(dpy, EGL_PLATFORM_GBM_MESA, mode);
 #else
-- 
2.17.1