swapchain, damage_ring: Drop buffer age

backend/drm/renderer.c

@@ -89,7 +89,7 @@ struct wlr_buffer *drm_surface_blit(struct wlr_drm_surface *surf,
 		return NULL;
 	}
 
-	struct wlr_buffer *dst = wlr_swapchain_acquire(surf->swapchain, NULL);
+	struct wlr_buffer *dst = wlr_swapchain_acquire(surf->swapchain);
 	if (!dst) {
 		wlr_log(WLR_ERROR, "Failed to acquire multi-GPU swapchain buffer");
 		goto error_tex;

include/wlr/render/swapchain.h

@@ -10,7 +10,6 @@
 struct wlr_swapchain_slot {
 	struct wlr_buffer *buffer;
 	bool acquired; // waiting for release
-	int age;
 
 	struct wl_listener release;
 };
@@ -36,21 +35,12 @@ void wlr_swapchain_destroy(struct wlr_swapchain *swapchain);
  * 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);
+struct wlr_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain);
 /**
  * Returns true if this buffer has been created by this swapchain, and false
  * otherwise.
  */
 bool wlr_swapchain_has_buffer(struct wlr_swapchain *swapchain,
 	struct wlr_buffer *buffer);
-/**
- * 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

include/wlr/types/wlr_damage_ring.h

@@ -15,9 +15,6 @@
 #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
-
 struct wlr_box;
 
 struct wlr_damage_ring_buffer {
@@ -37,9 +34,6 @@ struct wlr_damage_ring {
 
 	// private state
 
-	pixman_region32_t previous[WLR_DAMAGE_RING_PREVIOUS_LEN];
-	size_t previous_idx;
-
 	struct wl_list buffers; // wlr_damage_ring_buffer.link
 };
 
@@ -79,20 +73,6 @@ bool wlr_damage_ring_add_box(struct wlr_damage_ring *ring,
  */
 void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring);
 
-/**
- * Rotate the damage ring. This needs to be called after using the accumulated
- * damage, e.g. after rendering to an output's back buffer.
- */
-void wlr_damage_ring_rotate(struct wlr_damage_ring *ring);
-
-/**
- * Get accumulated damage, which is the difference between the current buffer
- * and the buffer with age of buffer_age; in context of rendering, this is
- * the region that needs to be redrawn.
- */
-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.
  *

render/swapchain.c

@@ -65,7 +65,7 @@ static void slot_handle_release(struct wl_listener *listener, void *data) {
 }
 
 static struct wlr_buffer *slot_acquire(struct wlr_swapchain *swapchain,
-		struct wlr_swapchain_slot *slot, int *age) {
+		struct wlr_swapchain_slot *slot) {
 	assert(!slot->acquired);
 	assert(slot->buffer != NULL);
 
@@ -74,15 +74,10 @@ static struct wlr_buffer *slot_acquire(struct wlr_swapchain *swapchain,
 	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_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain) {
 	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];
@@ -90,7 +85,7 @@ struct wlr_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain,
 			continue;
 		}
 		if (slot->buffer != NULL) {
-			return slot_acquire(swapchain, slot, age);
+			return slot_acquire(swapchain, slot);
 		}
 		free_slot = slot;
 	}
@@ -110,7 +105,7 @@ struct wlr_buffer *wlr_swapchain_acquire(struct wlr_swapchain *swapchain,
 		wlr_log(WLR_ERROR, "Failed to allocate buffer");
 		return NULL;
 	}
-	return slot_acquire(swapchain, free_slot, age);
+	return slot_acquire(swapchain, free_slot);
 }
 
 bool wlr_swapchain_has_buffer(struct wlr_swapchain *swapchain,
@@ -123,23 +118,3 @@ bool wlr_swapchain_has_buffer(struct wlr_swapchain *swapchain,
 	}
 	return false;
 }
-
-void wlr_swapchain_set_buffer_submitted(struct wlr_swapchain *swapchain,
-		struct wlr_buffer *buffer) {
-	assert(buffer != NULL);
-
-	if (!wlr_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++;
-		}
-	}
-}

types/output/cursor.c

@@ -241,8 +241,7 @@ static struct wlr_buffer *render_cursor_buffer(struct wlr_output_cursor *cursor)
 		}
 	}
 
-	struct wlr_buffer *buffer =
-		wlr_swapchain_acquire(output->cursor_swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->cursor_swapchain);
 	if (buffer == NULL) {
 		return NULL;
 	}

types/output/output.c

@@ -271,11 +271,6 @@ static void output_apply_state(struct wlr_output *output,
 		}
 	}
 
-	if ((state->committed & WLR_OUTPUT_STATE_BUFFER) &&
-			output->swapchain != NULL) {
-		wlr_swapchain_set_buffer_submitted(output->swapchain, state->buffer);
-	}
-
 	bool mode_updated = false;
 	if (state->committed & WLR_OUTPUT_STATE_MODE) {
 		int width = 0, height = 0, refresh = 0;

types/output/render.c

@@ -55,7 +55,7 @@ static struct wlr_buffer *output_acquire_empty_buffer(struct wlr_output *output,
 		return NULL;
 	}
 
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain);
 	if (buffer == NULL) {
 		return NULL;
 	}
@@ -204,7 +204,7 @@ struct wlr_render_pass *wlr_output_begin_render_pass(struct wlr_output *output,
 		return NULL;
 	}
 
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain);
 	if (buffer == NULL) {
 		return NULL;
 	}

types/output/swapchain.c

@@ -50,7 +50,7 @@ static struct wlr_swapchain *create_swapchain(struct wlr_output *output,
 
 static bool test_swapchain(struct wlr_output *output,
 		struct wlr_swapchain *swapchain, const struct wlr_output_state *state) {
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain);
 	if (buffer == NULL) {
 		return false;
 	}

types/scene/wlr_scene.c

@@ -2089,7 +2089,7 @@ bool wlr_scene_output_build_state(struct wlr_scene_output *scene_output,
 		swapchain = output->swapchain;
 	}
 
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain);
 	if (buffer == NULL) {
 		return false;
 	}

types/wlr_damage_ring.c

@@ -15,10 +15,6 @@ void wlr_damage_ring_init(struct wlr_damage_ring *ring) {
 	};
 
 	pixman_region32_init(&ring->current);
-	for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
-		pixman_region32_init(&ring->previous[i]);
-	}
-
 	wl_list_init(&ring->buffers);
 }
 
@@ -31,9 +27,6 @@ static void buffer_destroy(struct wlr_damage_ring_buffer *entry) {
 
 void wlr_damage_ring_finish(struct wlr_damage_ring *ring) {
 	pixman_region32_fini(&ring->current);
-	for (size_t i = 0; i < WLR_DAMAGE_RING_PREVIOUS_LEN; ++i) {
-		pixman_region32_fini(&ring->previous[i]);
-	}
 	struct wlr_damage_ring_buffer *entry, *tmp_entry;
 	wl_list_for_each_safe(entry, tmp_entry, &ring->buffers, link) {
 		buffer_destroy(entry);
@@ -92,43 +85,6 @@ void wlr_damage_ring_add_whole(struct wlr_damage_ring *ring) {
 		&ring->current, 0, 0, ring->width, ring->height);
 }
 
-void wlr_damage_ring_rotate(struct wlr_damage_ring *ring) {
-	// modular decrement
-	ring->previous_idx = ring->previous_idx +
-		WLR_DAMAGE_RING_PREVIOUS_LEN - 1;
-	ring->previous_idx %= WLR_DAMAGE_RING_PREVIOUS_LEN;
-
-	pixman_region32_copy(&ring->previous[ring->previous_idx], &ring->current);
-	pixman_region32_clear(&ring->current);
-}
-
-void wlr_damage_ring_get_buffer_damage(struct wlr_damage_ring *ring,
-		int buffer_age, pixman_region32_t *damage) {
-	if (buffer_age <= 0 || buffer_age - 1 > WLR_DAMAGE_RING_PREVIOUS_LEN) {
-		pixman_region32_clear(damage);
-		pixman_region32_union_rect(damage, damage,
-			0, 0, ring->width, ring->height);
-	} else {
-		pixman_region32_copy(damage, &ring->current);
-
-		// Accumulate damage from old buffers
-		for (int i = 0; i < buffer_age - 1; ++i) {
-			int j = (ring->previous_idx + i) % WLR_DAMAGE_RING_PREVIOUS_LEN;
-			pixman_region32_union(damage, damage, &ring->previous[j]);
-		}
-
-		// Check the number of rectangles
-		int n_rects = pixman_region32_n_rects(damage);
-		if (n_rects > WLR_DAMAGE_RING_MAX_RECTS) {
-			pixman_box32_t *extents = pixman_region32_extents(damage);
-			pixman_region32_union_rect(damage, damage,
-				extents->x1, extents->y1,
-				extents->x2 - extents->x1,
-				extents->y2 - extents->y1);
-		}
-	}
-}
-
 static void entry_squash_damage(struct wlr_damage_ring_buffer *entry) {
 	pixman_region32_t *prev;
 	if (entry->link.prev == &entry->ring->buffers) {

types/wlr_output_swapchain_manager.c

@@ -143,7 +143,7 @@ static bool manager_output_prepare(struct wlr_output_swapchain_manager_output *m
 		return false;
 	}
 
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain, NULL);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(swapchain);
 	if (buffer == NULL) {
 		return false;
 	}

types/wlr_screencopy_v1.c

@@ -542,8 +542,7 @@ static void capture_output(struct wl_client *wl_client,
 		goto error;
 	}
 
-	int buffer_age;
-	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain, &buffer_age);
+	struct wlr_buffer *buffer = wlr_swapchain_acquire(output->swapchain);
 	if (buffer == NULL) {
 		goto error;
 	}