simple-egl: HACK to report presentation flags

So that we can test the per-surface ZERO_COPY flag:
- start Weston on DRM backend
- run ./weston-simple-egl -o (need to be opaque to end up on overlay)
- hit debug key 'V' to enable the (broken) hw overlays

The debug key is used by first hitting Mod+Shift+space, then hitting 'v'.

Enabling overlays should change the flags from 0x7 to 0xe. To verify the
window is really on an overlay, use debug key 'S' to tint all
GL-composited things green.

This patch is not intended for upstream.

Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Tested-by: Mario Kleiner <mario.kleiner.de@gmail.com>

Makefile.am

@@ -441,6 +441,8 @@ if BUILD_SIMPLE_EGL_CLIENTS
 demo_clients += weston-simple-egl
 weston_simple_egl_SOURCES = clients/simple-egl.c
 nodist_weston_simple_egl_SOURCES =		\
+	protocol/presentation_timing-protocol.c		\
+	protocol/presentation_timing-client-protocol.h	\
 	protocol/xdg-shell-protocol.c		\
 	protocol/xdg-shell-client-protocol.h		\
 	protocol/ivi-application-protocol.c		\

clients/simple-egl.c

@@ -46,6 +46,8 @@
 #include "protocol/ivi-application-client-protocol.h"
 #define IVI_SURFACE_ID 9000
 
+#include "presentation_timing-client-protocol.h"
+
 #ifndef EGL_EXT_swap_buffers_with_damage
 #define EGL_EXT_swap_buffers_with_damage 1
 typedef EGLBoolean (EGLAPIENTRYP PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC)(EGLDisplay dpy, EGLSurface surface, EGLint *rects, EGLint n_rects);
@@ -81,6 +83,8 @@ struct display {
 	struct ivi_application *ivi_application;
 
 	PFNEGLSWAPBUFFERSWITHDAMAGEEXTPROC swap_buffers_with_damage;
+
+	struct presentation *presentation;
 };
 
 struct geometry {
@@ -125,6 +129,43 @@ static const char *frag_shader_text =
 
 static int running = 1;
 
+static void
+feedback_sync_output(void *data,
+		     struct presentation_feedback *presentation_feedback,
+		     struct wl_output *output)
+{
+}
+
+static void
+feedback_presented(void *data,
+		   struct presentation_feedback *feedback,
+		   uint32_t tv_sec_hi,
+		   uint32_t tv_sec_lo,
+		   uint32_t tv_nsec,
+		   uint32_t refresh_nsec,
+		   uint32_t seq_hi,
+		   uint32_t seq_lo,
+		   uint32_t flags)
+{
+	printf("presented %p, flags %#x at %" PRIu64 ".%09u\n",
+		feedback, flags,
+		((uint64_t)tv_sec_hi << 32) + tv_sec_lo, tv_nsec);
+	presentation_feedback_destroy(feedback);
+}
+
+static void
+feedback_discarded(void *data, struct presentation_feedback *feedback)
+{
+	printf("discarded %p\n", feedback);
+	presentation_feedback_destroy(feedback);
+}
+
+static const struct presentation_feedback_listener feedback_listener = {
+	feedback_sync_output,
+	feedback_presented,
+	feedback_discarded
+};
+
 static void
 init_egl(struct display *display, struct window *window)
 {
@@ -456,6 +497,7 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
 	EGLint rect[4];
 	EGLint buffer_age = 0;
 	struct timeval tv;
+	struct presentation_feedback *fback;
 
 	assert(window->callback == callback);
 	window->callback = NULL;
@@ -515,6 +557,9 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
 		wl_surface_set_opaque_region(window->surface, NULL);
 	}
 
+	fback = presentation_feedback(display->presentation, window->surface);
+	presentation_feedback_add_listener(fback, &feedback_listener, window);
+
 	if (display->swap_buffers_with_damage && buffer_age > 0) {
 		rect[0] = window->geometry.width / 4 - 1;
 		rect[1] = window->geometry.height / 4 - 1;
@@ -757,6 +802,10 @@ registry_handle_global(void *data, struct wl_registry *registry,
 		d->compositor =
 			wl_registry_bind(registry, name,
 					 &wl_compositor_interface, 1);
+	} else if (strcmp(interface, "presentation") == 0) {
+		d->presentation =
+			wl_registry_bind(registry,
+					 name, &presentation_interface, 1);
 	} else if (strcmp(interface, "xdg_shell") == 0) {
 		d->shell = wl_registry_bind(registry, name,
 					    &xdg_shell_interface, 1);