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#include <assert.h>
#include <stdlib.h>
#include <wlr/util/log.h>
#include <wlr/render/swapchain.h>
#include <wlr/types/wlr_buffer.h>
#include "render/allocator/allocator.h"
#include "render/drm_format_set.h"
static void swapchain_handle_allocator_destroy(struct wl_listener *listener,
void *data) {
struct wlr_swapchain *swapchain =
wl_container_of(listener, swapchain, allocator_destroy);
swapchain->allocator = NULL;
wl_list_remove(&swapchain->allocator_destroy.link);
wl_list_init(&swapchain->allocator_destroy.link);
}
struct wlr_swapchain *wlr_swapchain_create(
struct wlr_allocator *alloc, int width, int height,
const struct wlr_drm_format *format) {
struct wlr_swapchain *swapchain = calloc(1, sizeof(*swapchain));
if (swapchain == NULL) {
return NULL;
}
swapchain->allocator = alloc;
swapchain->width = width;
swapchain->height = height;
if (!wlr_drm_format_copy(&swapchain->format, format)) {
free(swapchain);
return NULL;
}
swapchain->allocator_destroy.notify = swapchain_handle_allocator_destroy;
wl_signal_add(&alloc->events.destroy, &swapchain->allocator_destroy);
return swapchain;
}
static void slot_reset(struct wlr_swapchain_slot *slot) {
if (slot->acquired) {
wl_list_remove(&slot->release.link);
}
wlr_buffer_drop(slot->buffer);
*slot = (struct wlr_swapchain_slot){0};
}
void wlr_swapchain_destroy(struct wlr_swapchain *swapchain) {
if (swapchain == NULL) {
return;
}
for (size_t i = 0; i < WLR_SWAPCHAIN_CAP; i++) {
slot_reset(&swapchain->slots[i]);
}
wl_list_remove(&swapchain->allocator_destroy.link);
wlr_drm_format_finish(&swapchain->format);
free(swapchain);
}
static void slot_handle_release(struct wl_listener *listener, void *data) {
struct wlr_swapchain_slot *slot =
wl_container_of(listener, slot, release);
wl_list_remove(&slot->release.link);
slot->acquired = false;
}
static struct wlr_buffer *slot_acquire(struct wlr_swapchain *swapchain,
struct wlr_swapchain_slot *slot, int *age) {
assert(!slot->acquired);
assert(slot->buffer != NULL);
slot->acquired = true;
slot->release.notify = slot_handle_release;
wl_signal_add(&slot->buffer->events.release, &slot->release);
if (age != NULL) {
*age = slot->age;
}
return wlr_buffer_lock(slot->buffer);
}
struct wlr_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain,
int *age) {
struct wlr_swapchain_slot *free_slot = NULL;
for (size_t i = 0; i < WLR_SWAPCHAIN_CAP; i++) {
struct wlr_swapchain_slot *slot = &swapchain->slots[i];
if (slot->acquired) {
continue;
}
if (slot->buffer != NULL) {
return slot_acquire(swapchain, slot, age);
}
free_slot = slot;
}
if (free_slot == NULL) {
wlr_log(WLR_ERROR, "No free output buffer slot");
return NULL;
}
if (swapchain->allocator == NULL) {
return NULL;
}
wlr_log(WLR_DEBUG, "Allocating new swapchain buffer");
free_slot->buffer = wlr_allocator_create_buffer(swapchain->allocator,
swapchain->width, swapchain->height, &swapchain->format);
if (free_slot->buffer == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate buffer");
return NULL;
}
return slot_acquire(swapchain, free_slot, age);
}
static bool swapchain_has_buffer(struct wlr_swapchain *swapchain,
struct wlr_buffer *buffer) {
for (size_t i = 0; i < WLR_SWAPCHAIN_CAP; i++) {
struct wlr_swapchain_slot *slot = &swapchain->slots[i];
if (slot->buffer == buffer) {
return true;
}
}
return false;
}
void wlr_swapchain_set_buffer_submitted(struct wlr_swapchain *swapchain,
struct wlr_buffer *buffer) {
assert(buffer != NULL);
if (!swapchain_has_buffer(swapchain, buffer)) {
return;
}
// See the algorithm described in:
// https://www.khronos.org/registry/EGL/extensions/EXT/EGL_EXT_buffer_age.txt
for (size_t i = 0; i < WLR_SWAPCHAIN_CAP; i++) {
struct wlr_swapchain_slot *slot = &swapchain->slots[i];
if (slot->buffer == buffer) {
slot->age = 1;
} else if (slot->age > 0) {
slot->age++;
}
}
}
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