WIP callbacks or something

glonkers.c

@@ -26,6 +26,10 @@ double time_since_start() {
            (now.tv_nsec - program_start.tv_nsec) / 1e9;
 }
 
+void invoke_render(void *data, int width, int height, double time) {
+    render(Renderer *renderer, int w, int h, double time, char *shader_path, int reload_shader)
+}
+
 int main(int argc, char *argv[]) {
     char *shader_path = NULL;
     int output_type = OUTPUT_WINDOW;
@@ -52,6 +56,7 @@ int main(int argc, char *argv[]) {
     }
 
     struct client_state state;
+    state.render_func = invoke_render;
     wayland_init(&state, output_type);
 
     Renderer renderer = new_renderer();
@@ -62,11 +67,11 @@ int main(int argc, char *argv[]) {
 
         struct event event;
         wait_for_event(&state, &event);
-        if (event.type == EVENT_DRAW) {
-            int width = event.data.draw.width;
-            int height = event.data.draw.height;
-            render(&renderer, width, height, time, shader_path, 0);
-        }
+        //if (event.type == EVENT_DRAW) {
+        //    int width = event.data.draw.width;
+        //    int height = event.data.draw.height;
+        //    render(&renderer, width, height, time, shader_path, 0);
+        //}
     }
     //while (state.running) {
     //    double time = time_since_start();

wayland.c

@@ -88,6 +88,40 @@ static const struct zwlr_layer_surface_v1_listener zwlr_layer_surface_v1_listene
     .closed = zwlr_layer_surface_v1_closed,
 };
 
+static const struct wl_callback_listener wl_surface_frame_listener;
+
+static void
+wl_surface_frame_done(void *data, struct wl_callback *cb, uint32_t time) {
+	/* Destroy this callback */
+	wl_callback_destroy(cb);
+
+	struct surface *surface = data;
+    struct client_state *state = surface->state;
+
+	/* Request another frame */
+    // TODO, maybe skip this to avoid unecessary frames
+	cb = wl_surface_frame(surface->wl_surface);
+	wl_callback_add_listener(cb, &wl_surface_frame_listener, surface);
+
+	///* Update scroll amount at 24 pixels per second */
+	//if (state->last_frame != 0) {
+	//	int elapsed = time - state->last_frame;
+	//	state->offset += elapsed / 1000.0 * 24;
+	//}
+
+	///* Submit a frame for this event */
+	//struct wl_buffer *buffer = draw_frame(state);
+	//wl_surface_attach(state->wl_surface, buffer, 0, 0);
+	//wl_surface_damage_buffer(state->wl_surface, 0, 0, INT32_MAX, INT32_MAX);
+	//wl_surface_commit(state->wl_surface);
+
+	//state->last_frame = time;
+}
+
+static const struct wl_callback_listener wl_surface_frame_listener = {
+	.done = wl_surface_frame_done,
+};
+
 static void registry_handle_global(
         void *data,
         struct wl_registry *registry,
@@ -122,14 +156,19 @@ static void registry_handle_global(
         xdg_toplevel_add_listener(xdg_toplevel, &xdg_toplevel_listener, state);
 
         // save all the pointers
-        struct surface surface = {
+        struct surface stack_surface = {
             .wl_surface = wl_surface,
             .xdg_surface = xdg_surface,
             .xdg_toplevel = xdg_toplevel,
         };
         state->surface_list = malloc(sizeof(struct surface_list));
-        state->surface_list->data = surface;
+        state->surface_list->data = stack_surface;
         state->surface_list->next = NULL;
+        
+        // frame callback
+        struct wl_callback *cb = wl_surface_frame(wl_surface);
+        state->surface_list->data.state = state;
+        wl_callback_add_listener(cb, &wl_surface_frame_listener, &state->surface_list->data);
     }
     if ((strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) && (state->output_type == OUTPUT_LAYER)) {
         state->zwlr_layer_shell_v1 = wl_registry_bind(registry, name, &zwlr_layer_shell_v1_interface, 4);
@@ -160,17 +199,24 @@ static void registry_handle_global(
             .wl_surface = wl_surface,
             .zwlr_layer_surface_v1 = zwlr_layer_surface_v1,
         };
+        struct surface *surface_location;
         if (state->surface_list == NULL) {
             state->surface_list = malloc(sizeof(struct surface_list));
             state->surface_list->data = surface;
             state->surface_list->next = NULL;
+            surface_location = &state->surface_list->data;
         } else {
             struct surface_list *next = state->surface_list;
             while (next->next != NULL) { next = next->next; }
             next->next = malloc(sizeof(struct surface_list));
             next->next->data = surface;
             next->next->next = NULL;
+            surface_location = &next->next->data;
         }
+
+        struct wl_callback *cb = wl_surface_frame(wl_surface);
+        state->surface_list->data.state = state;
+        wl_callback_add_listener(cb, &wl_surface_frame_listener, surface_location);
     }
 }
 
@@ -295,9 +341,6 @@ void wayland_init(struct client_state *state, int output_type) {
     }
 
     egl_init(state);
-    
-    // TODO fix frame callbacks for all surfaces
-
 }
 
 /// Swaps front/backbuffers and dispatches pending wayland commands.
@@ -320,7 +363,7 @@ void commit(struct client_state *state) {
     }
 }
 
-void wait_for_event(struct client_state *state, struct event event) {
+void wait_for_event(struct client_state *state, struct event *event) {
     wl_display_dispatch(state->wl_display);
 }
 

wayland.h

@@ -19,6 +19,9 @@ struct surface {
     struct wl_output *wl_output;
 
     EGLSurface egl_surface;
+
+    // notice, surface does not own `state`, this is a backlink.
+    struct client_state *state;
 };
 
 struct surface_list {
@@ -41,6 +44,9 @@ struct client_state {
     EGLDisplay egl_display;
     EGLConfig egl_config;
     EGLContext egl_context;
+
+    /// Provide this from caller.
+    void(*render_func)(void *data, int width, int height, double time);
 };
 
 #define EVENT_DRAW 0
@@ -58,5 +64,5 @@ struct event {
 void wayland_init(struct client_state *state, int output_type);
 void commit(struct client_state *state);
 /// Provide pointer to be filled.
-void wait_for_event(struct client_state *state, struct event event);
+void wait_for_event(struct client_state *state, struct event *event);