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damage_ring: add wlr_damage_ring_rotate_buffer()

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This adds an alternate way to use wlr_damage_ring without the
concept of buffer age. Buffer age is a concept inherited from EGL
but there is no real reason why we should continue to use that in
wlroots. Instead, use wlr_buffer pointers.

Eventually, we should be able to remove the buffer age based
functions.
This commit is contained in:
Simon Ser 2023-11-17 18:41:46 +01:00 • committed by Alexander Orzechowski
parent 62b6c492d5
commit 2093564616
2 changed files with 103 additions and 0 deletions
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26
include/wlr/types/wlr_damage_ring.h
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@ -13,12 +13,22 @@
#include <stddef.h>
#include <stdint.h>
#include <pixman.h>
#include <wayland-server-core.h>
/* For triple buffering, a history of two frames is required. */
#define WLR_DAMAGE_RING_PREVIOUS_LEN 2
/* Keep track of as many buffers as a swapchain can hold */
#define WLR_DAMAGE_RING_BUFFERS_LEN 4
struct wlr_box;
struct wlr_damage_ring_buffer {
struct wlr_buffer *buffer;
struct wl_listener destroy;
pixman_region32_t damage;
uint64_t seq;
};
struct wlr_damage_ring {
int32_t width, height;
@ -29,6 +39,9 @@ struct wlr_damage_ring {
pixman_region32_t previous[WLR_DAMAGE_RING_PREVIOUS_LEN];
size_t previous_idx;
uint64_t last_buffer_seq;
struct wlr_damage_ring_buffer buffers[WLR_DAMAGE_RING_BUFFERS_LEN];
};
void wlr_damage_ring_init(struct wlr_damage_ring *ring);
@ -81,4 +94,17 @@ void wlr_damage_ring_rotate(struct wlr_damage_ring *ring);
void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
int buffer_age, pixman_region32_t *damage);
/**
* Get accumulated buffer damage and rotate the damage ring.
*
* The accumulated buffer damage is the difference between the to-be-painted
* buffer and the passed-in buffer. In other words, this is the region that
* needs to be redrawn.
*
* Users should damage the ring if an error occurs while rendering or
* submitting the new buffer to the backend.
*/
void wlr_damage_ring_rotate_buffer(struct wlr_damage_ring *ring,
struct wlr_buffer *buffer, pixman_region32_t *damage);
#endif