[PATCH spice 14/18] Add new spice-gl stubs API

[Marc-André Lureau <marcandre.lureau@xxxxxxxxx>]

- spice_gl_scanout() to take the current scanout

- spice_gl_draw_async() to draw the scanout, is like other Spice async
  functions, it takes a cookie and will return in the
  QXLInterface.async_complete()

Two new fields are also added to QXLState, in order to save the current
scanout, and the pending async.

Signed-off-by: Marc-André Lureau <marcandre.lureau@xxxxxxxxx>
---
 server/red-dispatcher.c  | 34 ++++++++++++++++++++++++++++++++++
 server/reds.c            |  1 +
 server/reds.h            |  2 ++
 server/spice-qxl.h       | 11 +++++++++++
 server/spice-server.syms |  6 ++++++
 5 files changed, 54 insertions(+)

diff --git a/server/red-dispatcher.c b/server/red-dispatcher.c
index 0810798..a1e4e1e 100644
--- a/server/red-dispatcher.c
+++ b/server/red-dispatcher.c
@@ -959,6 +959,40 @@ void spice_qxl_driver_unload(QXLInstance *instance)
     red_dispatcher_driver_unload(instance->st->dispatcher);
 }
 
+SPICE_GNUC_VISIBLE
+void spice_gl_scanout(QXLInstance *qxl,
+                      int fd,
+                      uint32_t width, uint32_t height,
+                      uint32_t stride, uint32_t format,
+                      int y_0_top)
+{
+    spice_return_if_fail(qxl != NULL);
+
+    if (qxl->st->scanout.fd != -1) {
+        close(qxl->st->scanout.fd);
+    }
+
+    qxl->st->scanout = (SpiceMsgDisplayGlScanoutUnix) {
+        .flags = y_0_top ? SPICE_GL_SCANOUT_FLAGS_Y0TOP : 0,
+        .fd = fd,
+        .width = width,
+        .height = height,
+        .stride = stride,
+        .format = format
+    };
+}
+
+SPICE_GNUC_VISIBLE
+void spice_gl_draw_async(QXLInstance *qxl,
+                         uint32_t x, uint32_t y,
+                         uint32_t w, uint32_t h,
+                         uint64_t cookie)
+{
+    spice_return_if_fail(qxl != NULL);
+    spice_return_if_fail(qxl->st->scanout.fd != -1);
+    spice_return_if_fail(qxl->st->gl_draw_async == NULL);
+}
+
 void red_dispatcher_async_complete(struct RedDispatcher *dispatcher,
                                    AsyncCommand *async_command)
 {
diff --git a/server/reds.c b/server/reds.c
index e8cf168..fafa135 100644
--- a/server/reds.c
+++ b/server/reds.c
@@ -3155,6 +3155,7 @@ SPICE_GNUC_VISIBLE int spice_server_add_interface(SpiceServer *s,
 
         qxl = SPICE_CONTAINEROF(sin, QXLInstance, base);
         qxl->st = spice_new0(QXLState, 1);
+        qxl->st->scanout.fd = -1;
         qxl->st->qif = SPICE_CONTAINEROF(interface, QXLInterface, base);
         red_dispatcher_init(qxl);
 
diff --git a/server/reds.h b/server/reds.h
index 4d1b631..07ad8f9 100644
--- a/server/reds.h
+++ b/server/reds.h
@@ -33,6 +33,8 @@
 struct QXLState {
     QXLInterface          *qif;
     struct RedDispatcher  *dispatcher;
+    SpiceMsgDisplayGlScanoutUnix scanout;
+    AsyncCommand *gl_draw_async;
 };
 
 struct TunnelWorker;
diff --git a/server/spice-qxl.h b/server/spice-qxl.h
index e1f14e7..466b95c 100644
--- a/server/spice-qxl.h
+++ b/server/spice-qxl.h
@@ -193,4 +193,15 @@ struct QXLInstance {
     QXLState           *st;
 };
 
+void spice_gl_scanout(QXLInstance *instance,
+                      int fd,
+                      uint32_t width, uint32_t height,
+                      uint32_t stride, uint32_t format,
+                      int y_0_top);
+
+void spice_gl_draw_async(QXLInstance *instance,
+                         uint32_t x, uint32_t y,
+                         uint32_t w, uint32_t h,
+                         uint64_t cookie);
+
 #endif /* SPICE_QXL_H_ */
diff --git a/server/spice-server.syms b/server/spice-server.syms
index d65e14d..09ed19f 100644
--- a/server/spice-server.syms
+++ b/server/spice-server.syms
@@ -162,3 +162,9 @@ global:
     spice_replay_next_cmd;
     spice_replay_free_cmd;
 } SPICE_SERVER_0.12.5;
+
+SPICE_SERVER_0.13 {
+global:
+    spice_gl_scanout;
+    spice_gl_draw_async;
+} SPICE_SERVER_0.12.6;
-- 
2.5.0

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