render/swapchain: make public

We've had this struct for a while. It'd be useful for compositors
if they want to manage the swap chains themselves instead of being
forced to use wlr_output's. Some compositors might also want to use
a swapchain without an output.

include/render/swapchain.h

@@ -1,50 +0,0 @@
-#ifndef RENDER_SWAPCHAIN_H
-#define RENDER_SWAPCHAIN_H
-
-#include <stdbool.h>
-#include <wayland-server-core.h>
-#include <wlr/render/drm_format_set.h>
-
-#define WLR_SWAPCHAIN_CAP 4
-
-struct wlr_swapchain_slot {
-	struct wlr_buffer *buffer;
-	bool acquired; // waiting for release
-	int age;
-
-	struct wl_listener release;
-};
-
-struct wlr_swapchain {
-	struct wlr_allocator *allocator; // NULL if destroyed
-
-	int width, height;
-	struct wlr_drm_format *format;
-
-	struct wlr_swapchain_slot slots[WLR_SWAPCHAIN_CAP];
-
-	struct wl_listener allocator_destroy;
-};
-
-struct wlr_swapchain *wlr_swapchain_create(
-	struct wlr_allocator *alloc, int width, int height,
-	const struct wlr_drm_format *format);
-void wlr_swapchain_destroy(struct wlr_swapchain *swapchain);
-/**
- * Acquire a buffer from the swap chain.
- *
- * The returned buffer is locked. When the caller is done with it, they must
- * unlock it by calling wlr_buffer_unlock.
- */
-struct wlr_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain,
-	int *age);
-/**
- * Mark the buffer as submitted for presentation. This needs to be called by
- * swap chain users on frame boundaries.
- *
- * If the buffer hasn't been created via the swap chain, the call is ignored.
- */
-void wlr_swapchain_set_buffer_submitted(struct wlr_swapchain *swapchain,
-	struct wlr_buffer *buffer);
-
-#endif