ui/gtk-egl: add cursor_dmabuf support

Add support for cursor dmabufs to gtk-egl.  Just blend in the cursor
(if we have one) when rendering the dmabuf.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 20180306090951.22932-7-kraxel@redhat.com

include/ui/gtk.h

@@ -54,6 +54,9 @@ typedef struct VirtualGfxConsole {
     int x, y, w, h;
     egl_fb guest_fb;
     egl_fb win_fb;
+    egl_fb cursor_fb;
+    int cursor_x;
+    int cursor_y;
     bool y0_top;
     bool scanout_mode;
 #endif
@@ -115,6 +118,11 @@ void gd_egl_scanout_texture(DisplayChangeListener *dcl,
                             uint32_t w, uint32_t h);
 void gd_egl_scanout_dmabuf(DisplayChangeListener *dcl,
                            QemuDmaBuf *dmabuf);
+void gd_egl_cursor_dmabuf(DisplayChangeListener *dcl,
+                          QemuDmaBuf *dmabuf, bool have_hot,
+                          uint32_t hot_x, uint32_t hot_y);
+void gd_egl_cursor_position(DisplayChangeListener *dcl,
+                            uint32_t pos_x, uint32_t pos_y);
 void gd_egl_release_dmabuf(DisplayChangeListener *dcl,
                            QemuDmaBuf *dmabuf);
 void gd_egl_scanout_flush(DisplayChangeListener *dcl,

ui/gtk-egl.c

@@ -19,6 +19,7 @@
 #include "ui/console.h"
 #include "ui/gtk.h"
 #include "ui/egl-helpers.h"
+#include "ui/shader.h"
 
 #include "sysemu/sysemu.h"
 
@@ -209,6 +210,35 @@ void gd_egl_scanout_dmabuf(DisplayChangeListener *dcl,
 #endif
 }
 
+void gd_egl_cursor_dmabuf(DisplayChangeListener *dcl,
+                          QemuDmaBuf *dmabuf, bool have_hot,
+                          uint32_t hot_x, uint32_t hot_y)
+{
+#ifdef CONFIG_OPENGL_DMABUF
+    VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
+
+    if (dmabuf) {
+        egl_dmabuf_import_texture(dmabuf);
+        if (!dmabuf->texture) {
+            return;
+        }
+        egl_fb_setup_for_tex(&vc->gfx.cursor_fb, dmabuf->width, dmabuf->height,
+                             dmabuf->texture, false);
+    } else {
+        egl_fb_destroy(&vc->gfx.cursor_fb);
+    }
+#endif
+}
+
+void gd_egl_cursor_position(DisplayChangeListener *dcl,
+                            uint32_t pos_x, uint32_t pos_y)
+{
+    VirtualConsole *vc = container_of(dcl, VirtualConsole, gfx.dcl);
+
+    vc->gfx.cursor_x = pos_x;
+    vc->gfx.cursor_y = pos_y;
+}
+
 void gd_egl_release_dmabuf(DisplayChangeListener *dcl,
                            QemuDmaBuf *dmabuf)
 {
@@ -237,7 +267,15 @@ void gd_egl_scanout_flush(DisplayChangeListener *dcl,
     window = gtk_widget_get_window(vc->gfx.drawing_area);
     gdk_drawable_get_size(window, &ww, &wh);
     egl_fb_setup_default(&vc->gfx.win_fb, ww, wh);
-    egl_fb_blit(&vc->gfx.win_fb, &vc->gfx.guest_fb, !vc->gfx.y0_top);
+    if (vc->gfx.cursor_fb.texture) {
+        egl_texture_blit(vc->gfx.gls, &vc->gfx.win_fb, &vc->gfx.guest_fb,
+                         vc->gfx.y0_top);
+        egl_texture_blend(vc->gfx.gls, &vc->gfx.win_fb, &vc->gfx.cursor_fb,
+                          vc->gfx.y0_top,
+                          vc->gfx.cursor_x, vc->gfx.cursor_y);
+    } else {
+        egl_fb_blit(&vc->gfx.win_fb, &vc->gfx.guest_fb, !vc->gfx.y0_top);
+    }
 
     eglSwapBuffers(qemu_egl_display, vc->gfx.esurface);
 }

ui/gtk.c

@@ -745,6 +745,8 @@ static const DisplayChangeListenerOps dcl_egl_ops = {
     .dpy_gl_scanout_disable  = gd_egl_scanout_disable,
     .dpy_gl_scanout_texture  = gd_egl_scanout_texture,
     .dpy_gl_scanout_dmabuf   = gd_egl_scanout_dmabuf,
+    .dpy_gl_cursor_dmabuf    = gd_egl_cursor_dmabuf,
+    .dpy_gl_cursor_position  = gd_egl_cursor_position,
     .dpy_gl_release_dmabuf   = gd_egl_release_dmabuf,
     .dpy_gl_update           = gd_egl_scanout_flush,
 };