render: introduce wlr_render_rect_pass

Split rectangle rendering out of wlr_render_pass and add a dedicated
wlr_render_rect_pass interface.

Remove the add_rect hook from wlr_render_pass_impl and implement
rectangle rendering separately in the pixman, GLES2 and Vulkan
renderers.

include/render/gles2.h

@@ -173,4 +173,12 @@ struct wlr_gles2_render_pass *begin_gles2_buffer_pass(struct wlr_gles2_buffer *b
 	struct wlr_egl_context *prev_ctx, struct wlr_gles2_render_timer *timer,
 	struct wlr_drm_syncobj_timeline *signal_timeline, uint64_t signal_point);
 
+struct wlr_gles2_render_rect_pass {
+	struct wlr_render_rect_pass base;
+};
+
+bool wlr_render_rect_pass_is_gles2(const struct wlr_render_rect_pass *rect_pass);
+struct wlr_gles2_render_rect_pass *wlr_gles2_render_rect_pass_from_pass(
+	struct wlr_render_rect_pass *rect_pass);
+
 #endif

include/render/pixman.h

@@ -61,4 +61,12 @@ bool begin_pixman_data_ptr_access(struct wlr_buffer *buffer, pixman_image_t **im
 struct wlr_pixman_render_pass *begin_pixman_render_pass(
 	struct wlr_pixman_buffer *buffer);
 
+struct wlr_pixman_render_rect_pass {
+	struct wlr_render_rect_pass base;
+};
+
+bool wlr_render_rect_pass_is_pixman(const struct wlr_render_rect_pass *rect_pass);
+struct wlr_pixman_render_rect_pass *wlr_pixman_render_rect_pass_from_pass(
+	struct wlr_render_rect_pass *rect_pass);
+
 #endif

include/render/vulkan.h

@@ -592,4 +592,12 @@ void vulkan_change_layout(VkCommandBuffer cb, VkImage img,
 
 #endif
 
+struct wlr_vk_render_rect_pass {
+	struct wlr_render_rect_pass base;
+};
+
+bool wlr_render_rect_pass_is_vk(const struct wlr_render_rect_pass *rect_pass);
+struct wlr_vk_render_rect_pass *wlr_vk_render_rect_pass_from_pass(
+	struct wlr_render_rect_pass *rect_pass);
+
 #endif // RENDER_VULKAN_H

include/wlr/render/interface.h

@@ -50,6 +50,7 @@ void wlr_texture_init(struct wlr_texture *texture, struct wlr_renderer *rendener
 
 struct wlr_render_pass {
 	const struct wlr_render_pass_impl *impl;
+	struct wlr_renderer *renderer;
 };
 
 void wlr_render_pass_init(struct wlr_render_pass *pass,
@@ -59,9 +60,6 @@ struct wlr_render_pass_impl {
 	bool (*submit)(struct wlr_render_pass *pass);
 	void (*add_texture)(struct wlr_render_pass *pass,
 		const struct wlr_render_texture_options *options);
-	/* Implementers are also guaranteed that options->box is nonempty */
-	void (*add_rect)(struct wlr_render_pass *pass,
-		const struct wlr_render_rect_options *options);
 };
 
 struct wlr_render_timer {
@@ -87,4 +85,29 @@ void wlr_texture_read_pixels_options_get_src_box(
 void *wlr_texture_read_pixel_options_get_data(
 	const struct wlr_texture_read_pixels_options *options);
 
+struct wlr_render_rect_pass;
+
+struct wlr_render_rect_pass_impl {
+	void (*destroy)(struct wlr_render_rect_pass *pass);
+	void (*render)(struct wlr_render_pass *pass,
+		const struct wlr_render_rect_options *options);
+};
+
+struct wlr_render_rect_pass {
+	const struct wlr_render_rect_pass_impl *impl;
+	struct {
+		struct wl_signal destroy;
+	} events;
+};
+
+void wlr_render_rect_pass_init(struct wlr_render_rect_pass *pass,
+	const struct wlr_render_rect_pass_impl *impl);
+void wlr_render_rect_pass_destroy(struct wlr_render_rect_pass *pass);
+
+struct wlr_render_rect_pass *get_or_create_render_rect_pass(
+	struct wlr_renderer *renderer);
+struct wlr_render_rect_pass *wlr_pixman_render_rect_pass_create(void);
+struct wlr_render_rect_pass *wlr_gles2_render_rect_pass_create(void);
+struct wlr_render_rect_pass *wlr_vk_render_rect_pass_create(void);
+
 #endif

include/wlr/render/wlr_renderer.h

@@ -26,6 +26,10 @@ struct wlr_fbox;
  * A renderer for basic 2D operations.
  */
 struct wlr_renderer {
+	struct wlr_render_rect_pass *rect_pass;
+
+	void *data;
+
 	// Capabilities required for the buffer used as a render target (bitmask of
 	// enum wlr_buffer_cap)
 	uint32_t render_buffer_caps;

include/wlr/types/wlr_output.h

@@ -250,6 +250,8 @@ struct wlr_output {
 		struct wl_signal description;
 		struct wl_signal request_state; // struct wlr_output_event_request_state
 		struct wl_signal destroy;
+		// Emitted when the output's rendering subsystem is initialized or reinitialized
+		struct wl_signal render_inited;
 	} events;
 
 	struct wl_event_source *idle_frame;