From b0a663d39d2de1dcfd9a0381cc822c4713da508e Mon Sep 17 00:00:00 2001
From: Simon Ser <contact@emersion.fr>
Date: Mon, 1 Jun 2020 19:49:32 +0200
Subject: render: introduce wlr_swapchain
The swapchain maximum capacity is set to 4, so that we have enough room
for:
- A buffer currently displayed on screen
- A buffer queued for display (e.g. to KMS)
- A pending buffer that'll be queued next commit
- An additional pending buffer in case we want to invalidate the
currently pending one
---
include/render/swapchain.h | 41 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 41 insertions(+)
create mode 100644 include/render/swapchain.h
(limited to 'include/render')
diff --git a/include/render/swapchain.h b/include/render/swapchain.h
new file mode 100644
index 00000000..57a0cd3f
--- /dev/null
+++ b/include/render/swapchain.h
@@ -0,0 +1,41 @@
+#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
+
+ 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);
+
+#endif
--
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