[PATCH v2 2/8] ui/egl: Add egl helpers to help with synchronization

[Vivek Kasireddy <vivek.kasireddy@intel.com>]

These egl helpers would be used for creating and waiting on
a sync object.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
---
 include/ui/console.h     |  2 ++
 include/ui/egl-helpers.h |  3 +++
 ui/egl-helpers.c         | 44 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 49 insertions(+)

diff --git a/include/ui/console.h b/include/ui/console.h
index b30b63976a..49978fdae3 100644
--- a/include/ui/console.h
+++ b/include/ui/console.h
@@ -168,6 +168,8 @@ typedef struct QemuDmaBuf {
     uint64_t  modifier;
     uint32_t  texture;
     bool      y0_top;
+    void      *sync;
+    int       fence_fd;
 } QemuDmaBuf;
 
 typedef struct DisplayState DisplayState;
diff --git a/include/ui/egl-helpers.h b/include/ui/egl-helpers.h
index f1bf8f97fc..5a7575dc13 100644
--- a/include/ui/egl-helpers.h
+++ b/include/ui/egl-helpers.h
@@ -45,6 +45,9 @@ int egl_get_fd_for_texture(uint32_t tex_id, EGLint *stride, EGLint *fourcc,
 
 void egl_dmabuf_import_texture(QemuDmaBuf *dmabuf);
 void egl_dmabuf_release_texture(QemuDmaBuf *dmabuf);
+void egl_dmabuf_create_sync(QemuDmaBuf *dmabuf);
+void egl_dmabuf_create_fence(QemuDmaBuf *dmabuf);
+void egl_dmabuf_wait_sync(QemuDmaBuf *dmabuf);
 
 #endif
 
diff --git a/ui/egl-helpers.c b/ui/egl-helpers.c
index 6d0cb2b5cb..47220b66e0 100644
--- a/ui/egl-helpers.c
+++ b/ui/egl-helpers.c
@@ -76,6 +76,50 @@ void egl_fb_setup_for_tex(egl_fb *fb, int width, int height,
                               GL_TEXTURE_2D, fb->texture, 0);
 }
 
+void egl_dmabuf_create_sync(QemuDmaBuf *dmabuf)
+{
+    EGLSyncKHR sync;
+
+    if (epoxy_has_egl_extension(qemu_egl_display,
+                                "EGL_KHR_fence_sync") &&
+        epoxy_has_egl_extension(qemu_egl_display,
+                                "EGL_ANDROID_native_fence_sync")) {
+        sync = eglCreateSyncKHR(qemu_egl_display,
+				EGL_SYNC_NATIVE_FENCE_ANDROID, NULL);
+        if (sync != EGL_NO_SYNC_KHR) {
+            dmabuf->sync = sync;
+        }
+    }
+}
+
+void egl_dmabuf_create_fence(QemuDmaBuf *dmabuf)
+{
+    if (dmabuf->sync) {
+        dmabuf->fence_fd = eglDupNativeFenceFDANDROID(qemu_egl_display,
+                                                      dmabuf->sync);
+        eglDestroySyncKHR(qemu_egl_display, dmabuf->sync);
+        dmabuf->sync = NULL;
+    }
+}
+
+void egl_dmabuf_wait_sync(QemuDmaBuf *dmabuf)
+{
+    EGLSyncKHR sync;
+    EGLint attrib_list[] = {
+        EGL_SYNC_NATIVE_FENCE_FD_ANDROID, dmabuf->fence_fd,
+        EGL_NONE,
+    };
+
+    sync = eglCreateSyncKHR(qemu_egl_display,
+                            EGL_SYNC_NATIVE_FENCE_ANDROID, attrib_list);
+    if (sync != EGL_NO_SYNC_KHR) {
+        eglClientWaitSyncKHR(qemu_egl_display, sync,
+                             0, EGL_FOREVER_KHR);
+        eglDestroySyncKHR(qemu_egl_display, sync);
+        dmabuf->fence_fd = -1;
+    }
+}
+
 void egl_fb_setup_new_tex(egl_fb *fb, int width, int height)
 {
     GLuint texture;
-- 
2.30.2