gears: Use wayland egl surface instead of images

3 files changed, 80 insertions, 69 deletions

diff --git a/clients/gears.c b/clients/gears.c
index 2df79c3..e64ff3e 100644
--- a/clients/gears.c
+++ b/clients/gears.c
@@ -30,11 +30,8 @@
 #include <unistd.h>
 #include <math.h>
 #include <time.h>
-#include <cairo.h>
 #include <glib.h>
 
-#define GL_GLEXT_PROTOTYPES
-#define EGL_EGLEXT_PROTOTYPES
 #include <GL/gl.h>
 #include <EGL/egl.h>
 #include <EGL/eglext.h>
@@ -51,14 +48,11 @@ struct gears {
 	struct display *d;
 
 	EGLDisplay display;
+	EGLDisplay config;
 	EGLContext context;
 	GLfloat angle;
-	cairo_surface_t *cairo_surface;
 
 	GLint gear_list[3];
-	GLuint fbo, color_rbo[2], depth_rbo;
-	cairo_surface_t *surface[2];
-	int current;
 };
 
 struct gear_template {
@@ -203,55 +197,27 @@ make_gear(const struct gear_template *t)
 }
 
 static void
-allocate_buffer(struct gears *gears)
-{
-	EGLImageKHR image;
-	struct rectangle allocation;
-
-	window_draw(gears->window);
-
-	gears->surface[gears->current] = window_get_surface(gears->window);
-#ifdef HAVE_CAIRO_EGL
-	image = display_get_image_for_egl_image_surface(gears->display,
-							gears->surface[gears->current]);
-#else /* XXX: hack to make Wayland compile, even if this example doesn't run */
-	die("gears cannot allocate buffer: it was compiled without cairo-gl\n");
-	return;
-#endif
-	if (!eglMakeCurrent(gears->display, NULL, NULL, gears->context))
-		die("faile to make context current\n");
-
-	glBindRenderbuffer(GL_RENDERBUFFER_EXT,
-			   gears->color_rbo[gears->current]);
-	glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER, image);
-
-	glBindRenderbuffer(GL_RENDERBUFFER_EXT, gears->depth_rbo);
-	window_get_child_allocation(gears->window, &allocation);
-	glRenderbufferStorage(GL_RENDERBUFFER_EXT,
-			      GL_DEPTH_COMPONENT,
-			      allocation.width + 20 + 32,
-			      allocation.height + 60 + 32);
-}
-
-static void
 draw_gears(struct gears *gears)
 {
 	GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
+	struct rectangle window_allocation;
 	struct rectangle allocation;
 
-	if (gears->surface[gears->current] == NULL)
-		allocate_buffer(gears);
-
-	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER_EXT,
-				  GL_COLOR_ATTACHMENT0_EXT,
-				  GL_RENDERBUFFER_EXT,
-				  gears->color_rbo[gears->current]);
+	window_draw(gears->window);
 
 	window_get_child_allocation(gears->window, &allocation);
-	glViewport(allocation.x, allocation.y,
-		   allocation.width, allocation.height);
-	glScissor(allocation.x, allocation.y,
+	window_get_allocation(gears->window, &window_allocation);
+
+	display_acquire_window_surface(gears->d,
+				       gears->window,
+				       gears->context);
+	
+	glViewport(allocation.x,
+		   window_allocation.height - allocation.height - allocation.x,
 		   allocation.width, allocation.height);
+	glScissor(allocation.x,
+		  window_allocation.height - allocation.height - allocation.y,
+		  allocation.width, allocation.height);
 
 	glEnable(GL_SCISSOR_TEST);
 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
@@ -286,7 +252,7 @@ draw_gears(struct gears *gears)
 
 	glFlush();
 
-	window_set_surface(gears->window, gears->surface[gears->current]);
+	display_release(gears->d);
 	window_flush(gears->window);
 }
 
@@ -296,11 +262,6 @@ resize_handler(struct window *window,
 {
 	struct gears *gears = data;
 
-	cairo_surface_destroy(gears->surface[0]);
-	gears->surface[0] = NULL;
-	cairo_surface_destroy(gears->surface[1]);
-	gears->surface[1] = NULL;
-
 	/* Constrain child size to be square and at least 300x300 */
 	if (width > height)
 		height = width;
@@ -338,8 +299,6 @@ frame_callback(void *data, uint32_t time)
 {
 	struct gears *gears = data;
 
-	gears->current = 1 - gears->current;
-
 	gears->angle = (GLfloat) (time % 8192) * 360 / 8192.0;
 
 	window_schedule_redraw(gears->window);
@@ -359,7 +318,6 @@ gears_create(struct display *display)
 	gears->d = display;
 	gears->window = window_create(display, width, height);
 	window_set_title(gears->window, "Wayland Gears");
-	window_set_buffer_type(gears->window, WINDOW_BUFFER_TYPE_EGL_IMAGE);
 
 	gears->display = display_get_egl_display(gears->d);
 	if (gears->display == NULL)
@@ -367,24 +325,16 @@ gears_create(struct display *display)
 
 	eglBindAPI(EGL_OPENGL_API);
 
-	gears->context = eglCreateContext(gears->display,
-					  NULL, EGL_NO_CONTEXT, NULL);
+	gears->config = display_get_egl_config(gears->d);
+
+	gears->context = eglCreateContext(gears->display, gears->config,
+					  EGL_NO_CONTEXT, NULL);
 	if (gears->context == NULL)
 		die("failed to create context\n");
 
 	if (!eglMakeCurrent(gears->display, NULL, NULL, gears->context))
 		die("faile to make context current\n");
 
-	glGenFramebuffers(1, &gears->fbo);
-	glBindFramebuffer(GL_FRAMEBUFFER_EXT, gears->fbo);
-
-	glGenRenderbuffers(2, gears->color_rbo);
-	glGenRenderbuffers(1, &gears->depth_rbo);
-	glBindRenderbuffer(GL_RENDERBUFFER_EXT, gears->depth_rbo);
-	glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER_EXT,
-				  GL_DEPTH_ATTACHMENT_EXT,
-				  GL_RENDERBUFFER_EXT,
-				  gears->depth_rbo);
 	for (i = 0; i < 3; i++) {
 		gears->gear_list[i] = glGenLists(1);
 		glNewList(gears->gear_list[i], GL_COMPILE);
diff --git a/clients/window.c b/clients/window.c
index 4792710..6e7ef9b 100644
--- a/clients/window.c
+++ b/clients/window.c
@@ -870,7 +870,10 @@ window_draw_decorations(struct window *window)
 
 	cairo_destroy(cr);
 
+	/* FIXME: this breakes gears, fix cairo? */
+#if 0 
 	cairo_device_flush (window->display->device);
+#endif
 }
 
 void
@@ -1261,6 +1264,13 @@ static const struct wl_shell_listener shell_listener = {
 };
 
 void
+window_get_allocation(struct window *window,
+		      struct rectangle *allocation)
+{
+	*allocation = window->allocation;
+}
+
+void
 window_get_child_allocation(struct window *window,
 			    struct rectangle *allocation)
 {
@@ -1850,6 +1860,12 @@ display_get_egl_display(struct display *d)
 	return d->dpy;
 }
 
+EGLConfig
+display_get_egl_config(struct display *d)
+{
+	return d->conf;
+}
+
 struct wl_shell *
 display_get_shell(struct display *display)
 {
@@ -1857,6 +1873,35 @@ display_get_shell(struct display *display)
 }
 
 void
+display_acquire_window_surface(struct display *display,
+			       struct window *window,
+			       EGLContext ctx)
+{
+	struct egl_window_surface_data *data;
+
+	if (!window->cairo_surface)
+		return;
+
+	if (!ctx)
+		ctx = display->ctx;
+
+	data = cairo_surface_get_user_data(window->cairo_surface,
+					   &surface_data_key);
+
+	cairo_device_acquire(display->device);
+	if (!eglMakeCurrent(display->dpy, data->surf, data->surf, ctx))
+		fprintf(stderr, "failed to make surface current\n");
+}
+
+void
+display_release(struct display *display)
+{
+	if (!eglMakeCurrent(display->dpy, NULL, NULL, display->ctx))
+		fprintf(stderr, "failed to make context current\n");
+	cairo_device_release(display->device);
+}
+
+void
 display_run(struct display *d)
 {
 	g_main_loop_run(d->loop);
diff --git a/clients/window.h b/clients/window.h
index c1c5212..538ff07 100644
--- a/clients/window.h
+++ b/clients/window.h
@@ -26,6 +26,7 @@
 #include <X11/extensions/XKBcommon.h>
 #include <glib.h>
 #include <wayland-client.h>
+#include <cairo.h>
 
 struct window;
 
@@ -55,6 +56,16 @@ display_get_shell(struct display *display);
 EGLDisplay
 display_get_egl_display(struct display *d);
 
+EGLConfig
+display_get_egl_config(struct display *d);
+
+void
+display_acquire_window_surface(struct display *display,
+			       struct window *window,
+			       EGLContext ctx);
+void
+display_release(struct display *display);
+
 #ifdef HAVE_CAIRO_EGL
 EGLImageKHR
 display_get_image_for_egl_image_surface(struct display *display,
@@ -142,6 +153,11 @@ window_move(struct window *window, struct input *input, uint32_t time);
 
 void
 window_draw(struct window *window);
+
+void
+window_get_allocation(struct window *window,
+		      struct rectangle *allocation);
+
 void
 window_get_child_allocation(struct window *window,
 			    struct rectangle *allocation);