ui: add egl-headless support on win32

Make GBM optional for EGL code, and enable the build for win32.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20230606115658.677673-13-marcandre.lureau@redhat.com>

include/ui/egl-helpers.h

@@ -36,11 +36,12 @@ void egl_texture_blit(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip);
 void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,
                        int x, int y, double scale_x, double scale_y);
 
+extern EGLContext qemu_egl_rn_ctx;
+
 #ifdef CONFIG_GBM
 
 extern int qemu_egl_rn_fd;
 extern struct gbm_device *qemu_egl_rn_gbm_dev;
-extern EGLContext qemu_egl_rn_ctx;
 
 int egl_rendernode_init(const char *rendernode, DisplayGLMode mode);
 int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc,
@@ -62,6 +63,10 @@ int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode);
 
 #endif
 
+#ifdef WIN32
+int qemu_egl_init_dpy_win32(EGLNativeDisplayType dpy, DisplayGLMode mode);
+#endif
+
 EGLContext qemu_egl_init_ctx(void);
 bool qemu_egl_has_dmabuf(void);
 

qapi/ui.json

@@ -1484,8 +1484,7 @@
     { 'name': 'none' },
     { 'name': 'gtk', 'if': 'CONFIG_GTK' },
     { 'name': 'sdl', 'if': 'CONFIG_SDL' },
-    { 'name': 'egl-headless',
-              'if': { 'all': ['CONFIG_OPENGL', 'CONFIG_GBM'] } },
+    { 'name': 'egl-headless', 'if': 'CONFIG_OPENGL' },
     { 'name': 'curses', 'if': 'CONFIG_CURSES' },
     { 'name': 'cocoa', 'if': 'CONFIG_COCOA' },
     { 'name': 'spice-app', 'if': 'CONFIG_SPICE' },
@@ -1525,7 +1524,7 @@
       'cocoa': { 'type': 'DisplayCocoa', 'if': 'CONFIG_COCOA' },
       'curses': { 'type': 'DisplayCurses', 'if': 'CONFIG_CURSES' },
       'egl-headless': { 'type': 'DisplayEGLHeadless',
-                        'if': { 'all': ['CONFIG_OPENGL', 'CONFIG_GBM'] } },
+                        'if': 'CONFIG_OPENGL' },
       'dbus': { 'type': 'DisplayDBus', 'if': 'CONFIG_DBUS_DISPLAY' },
       'sdl': { 'type': 'DisplaySDL', 'if': 'CONFIG_SDL' }
   }

ui/egl-headless.c

@@ -79,6 +79,8 @@ static void egl_scanout_texture(DisplayChangeListener *dcl,
     }
 }
 
+#ifdef CONFIG_GBM
+
 static void egl_scanout_dmabuf(DisplayChangeListener *dcl,
                                QemuDmaBuf *dmabuf)
 {
@@ -110,6 +112,14 @@ static void egl_cursor_dmabuf(DisplayChangeListener *dcl,
     }
 }
 
+static void egl_release_dmabuf(DisplayChangeListener *dcl,
+                               QemuDmaBuf *dmabuf)
+{
+    egl_dmabuf_release_texture(dmabuf);
+}
+
+#endif
+
 static void egl_cursor_position(DisplayChangeListener *dcl,
                                 uint32_t pos_x, uint32_t pos_y)
 {
@@ -119,12 +129,6 @@ static void egl_cursor_position(DisplayChangeListener *dcl,
     edpy->pos_y = pos_y;
 }
 
-static void egl_release_dmabuf(DisplayChangeListener *dcl,
-                               QemuDmaBuf *dmabuf)
-{
-    egl_dmabuf_release_texture(dmabuf);
-}
-
 static void egl_scanout_flush(DisplayChangeListener *dcl,
                               uint32_t x, uint32_t y,
                               uint32_t w, uint32_t h)
@@ -160,10 +164,12 @@ static const DisplayChangeListenerOps egl_ops = {
 
     .dpy_gl_scanout_disable  = egl_scanout_disable,
     .dpy_gl_scanout_texture  = egl_scanout_texture,
+#ifdef CONFIG_GBM
     .dpy_gl_scanout_dmabuf   = egl_scanout_dmabuf,
     .dpy_gl_cursor_dmabuf    = egl_cursor_dmabuf,
-    .dpy_gl_cursor_position  = egl_cursor_position,
     .dpy_gl_release_dmabuf   = egl_release_dmabuf,
+#endif
+    .dpy_gl_cursor_position  = egl_cursor_position,
     .dpy_gl_update           = egl_scanout_flush,
 };
 

ui/egl-helpers.c

@@ -199,11 +199,12 @@ void egl_texture_blend(QemuGLShader *gls, egl_fb *dst, egl_fb *src, bool flip,
 
 /* ---------------------------------------------------------------------- */
 
+EGLContext qemu_egl_rn_ctx;
+
 #ifdef CONFIG_GBM
 
 int qemu_egl_rn_fd;
 struct gbm_device *qemu_egl_rn_gbm_dev;
-EGLContext qemu_egl_rn_ctx;
 
 int egl_rendernode_init(const char *rendernode, DisplayGLMode mode)
 {
@@ -400,7 +401,7 @@ EGLSurface qemu_egl_init_surface_x11(EGLContext ectx, EGLNativeWindowType win)
 
 /* ---------------------------------------------------------------------- */
 
-#if defined(CONFIG_X11) || defined(CONFIG_GBM)
+#if defined(CONFIG_X11) || defined(CONFIG_GBM) || defined(WIN32)
 
 /*
  * Taken from glamor_egl.h from the Xorg xserver, which is MIT licensed
@@ -508,6 +509,9 @@ static int qemu_egl_init_dpy(EGLNativeDisplayType dpy,
     return 0;
 }
 
+#endif
+
+#if defined(CONFIG_X11) || defined(CONFIG_GBM)
 int qemu_egl_init_dpy_x11(EGLNativeDisplayType dpy, DisplayGLMode mode)
 {
 #ifdef EGL_KHR_platform_x11
@@ -525,7 +529,14 @@ int qemu_egl_init_dpy_mesa(EGLNativeDisplayType dpy, DisplayGLMode mode)
     return qemu_egl_init_dpy(dpy, 0, mode);
 #endif
 }
+#endif
+
 
+#ifdef WIN32
+int qemu_egl_init_dpy_win32(EGLNativeDisplayType dpy, DisplayGLMode mode)
+{
+    return qemu_egl_init_dpy(dpy, 0, mode);
+}
 #endif
 
 bool qemu_egl_has_dmabuf(void)
@@ -577,15 +588,28 @@ bool egl_init(const char *rendernode, DisplayGLMode mode, Error **errp)
         return false;
     }
 
-#ifdef CONFIG_GBM
+#ifdef WIN32
+    if (qemu_egl_init_dpy_win32(EGL_DEFAULT_DISPLAY, mode) < 0) {
+        error_setg(errp, "egl: init failed");
+        return false;
+    }
+    qemu_egl_rn_ctx = qemu_egl_init_ctx();
+    if (!qemu_egl_rn_ctx) {
+        error_setg(errp, "egl: egl_init_ctx failed");
+        return false;
+    }
+#elif defined(CONFIG_GBM)
     if (egl_rendernode_init(rendernode, mode) < 0) {
         error_setg(errp, "egl: render node init failed");
         return false;
     }
+#endif
+
+    if (!qemu_egl_rn_ctx) {
+        error_setg(errp, "egl: not available on this platform");
+        return false;
+    }
+
     display_opengl = 1;
     return true;
-#else
-    error_setg(errp, "egl: not available on this platform");
-    return false;
-#endif
 }

ui/meson.build

@@ -65,10 +65,10 @@ if opengl.found()
   ui_modules += {'opengl' : opengl_ss}
 endif
 
-if opengl.found() and gbm.found()
+if opengl.found()
   egl_headless_ss = ss.source_set()
-  egl_headless_ss.add(when: [opengl, gbm, pixman],
-                      if_true: files('egl-headless.c'))
+  egl_headless_ss.add(when: [opengl, pixman],
+                      if_true: [files('egl-headless.c'), gbm])
   ui_modules += {'egl-headless' : egl_headless_ss}
 endif