ui: introduce egl_init()

Future patches will introduce EGL support on win32 (too late for 8.0
though). Having a common place for EGL initialization and error handling
will make it simpler.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

include/ui/egl-helpers.h

@@ -65,4 +65,6 @@ int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode);
 EGLContext qemu_egl_init_ctx(void);
 bool qemu_egl_has_dmabuf(void);
 
+bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp);
+
 #endif /* EGL_HELPERS_H */

ui/dbus.c

@@ -451,12 +451,7 @@ early_dbus_init(DisplayOptions *opts)
     DisplayGLMode mode = opts->has_gl ? opts->gl : DISPLAYGL_MODE_OFF;
 
     if (mode != DISPLAYGL_MODE_OFF) {
-        if (egl_rendernode_init(opts->u.dbus.rendernode, mode) < 0) {
-            error_report("dbus: render node init failed");
-            exit(1);
-        }
-
-        display_opengl = 1;
+        egl_init(opts->u.dbus.rendernode, mode, &error_fatal);
     }
 
     type_register(&dbus_vc_type_info);

ui/egl-headless.c

@@ -1,7 +1,7 @@
 #include "qemu/osdep.h"
 #include "qemu/error-report.h"
 #include "qemu/module.h"
-#include "sysemu/sysemu.h"
+#include "qapi/error.h"
 #include "ui/console.h"
 #include "ui/egl-helpers.h"
 #include "ui/egl-context.h"
@@ -191,21 +191,21 @@ static const DisplayGLCtxOps eglctx_ops = {
 
 static void early_egl_headless_init(DisplayOptions *opts)
 {
-    display_opengl = 1;
+    DisplayGLMode mode = DISPLAYGL_MODE_ON;
+
+    if (opts->has_gl) {
+        mode = opts->gl;
+    }
+
+    egl_init(opts->u.egl_headless.rendernode, mode, &error_fatal);
 }
 
 static void egl_headless_init(DisplayState *ds, DisplayOptions *opts)
 {
-    DisplayGLMode mode = opts->has_gl ? opts->gl : DISPLAYGL_MODE_ON;
     QemuConsole *con;
     egl_dpy *edpy;
     int idx;
 
-    if (egl_rendernode_init(opts->u.egl_headless.rendernode, mode) < 0) {
-        error_report("egl: render node init failed");
-        exit(1);
-    }
-
     for (idx = 0;; idx++) {
         DisplayGLCtx *ctx;
 

ui/egl-helpers.c

@@ -19,6 +19,8 @@
 #include "qemu/error-report.h"
 #include "ui/console.h"
 #include "ui/egl-helpers.h"
+#include "sysemu/sysemu.h"
+#include "qapi/error.h"
 
 EGLDisplay *qemu_egl_display;
 EGLConfig qemu_egl_config;
@@ -569,3 +571,25 @@ EGLContext qemu_egl_init_ctx(void)
 
     return ectx;
 }
+
+bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp)
+{
+    ERRP_GUARD();
+
+    if (mode == DISPLAYGL_MODE_OFF) {
+        error_setg(errp, "egl: turning off GL doesn't make sense");
+        return false;
+    }
+
+#ifdef CONFIG_GBM
+    if (egl_rendernode_init(rendernode, mode) < 0) {
+        error_setg(errp, "egl: render node init failed");
+        return false;
+    }
+    display_opengl = 1;
+    return true;
+#else
+    error_setg(errp, "egl: not available on this platform");
+    return false;
+#endif
+}

ui/spice-core.c

@@ -820,12 +820,7 @@ static void qemu_spice_init(void)
                          "incompatible with -spice port/tls-port");
             exit(1);
         }
-        if (egl_rendernode_init(qemu_opt_get(opts, "rendernode"),
-                                DISPLAYGL_MODE_ON) != 0) {
-            error_report("Failed to initialize EGL render node for SPICE GL");
-            exit(1);
-        }
-        display_opengl = 1;
+        egl_init(qemu_opt_get(opts, "rendernode"), DISPLAYGL_MODE_ON, &error_fatal);
         spice_opengl = 1;
     }
 #endif