From bedca07a021863d264e7c4c471cc30102899500f Mon Sep 17 00:00:00 2001
From: dudemanguy <random342@airmail.cc>
Date: Thu, 10 Oct 2019 14:14:40 -0500
Subject: wayland: add presentation time

Use ust/msc/refresh values from wayland's presentation time in mpv's
ra_swapchain_fns.get_vsync for the wayland contexts.
---
 video/out/vulkan/context_wayland.c | 81 +++++++++++++++++++++++++++++++++++++-
 1 file changed, 79 insertions(+), 2 deletions(-)

(limited to 'video/out/vulkan/context_wayland.c')

diff --git a/video/out/vulkan/context_wayland.c b/video/out/vulkan/context_wayland.c
index 783509e4a1..d3da628137 100644
--- a/video/out/vulkan/context_wayland.c
+++ b/video/out/vulkan/context_wayland.c
@@ -22,6 +22,9 @@
 #include "context.h"
 #include "utils.h"
 
+// Generated from presentation-time.xml
+#include "video/out/wayland/presentation-time.h"
+
 struct priv {
     struct mpvk_ctx vk;
 };
@@ -37,19 +40,92 @@ static void frame_callback(void *data, struct wl_callback *callback, uint32_t ti
 
     wl->frame_callback = wl_surface_frame(wl->surface);
     wl_callback_add_listener(wl->frame_callback, &frame_listener, wl);
-    wl->callback_wait = false;
+    wl->frame_wait = false;
 }
 
 static const struct wl_callback_listener frame_listener = {
     frame_callback,
 };
 
+static const struct wp_presentation_feedback_listener feedback_listener;
+
+static void feedback_sync_output(void *data, struct wp_presentation_feedback *fback,
+                               struct wl_output *output)
+{
+}
+
+static void feedback_presented(void *data, struct wp_presentation_feedback *fback,
+                              uint32_t tv_sec_hi, uint32_t tv_sec_lo,
+                              uint32_t tv_nsec, uint32_t refresh_nsec,
+                              uint32_t seq_hi, uint32_t seq_lo,
+                              uint32_t flags)
+{
+    struct vo_wayland_state *wl = data;
+    wp_presentation_feedback_destroy(fback);
+    vo_wayland_sync_shift(wl);
+
+    // Very similar to oml_sync_control, in this case we assume that every
+    // time the compositor receives feedback, a buffer swap has been already
+    // been performed.
+    //
+    // Notes:
+    //  - tv_sec_lo + tv_sec_hi is the equivalent of oml's ust
+    //  - seq_lo + seq_hi is the equivalent of oml's msc
+    //  - these values are updated everytime the compositor receives feedback.
+
+    int index = last_available_sync(wl);
+    if (index < 0) {
+        queue_new_sync(wl);
+        index = 0;
+    }
+    int64_t sec = (uint64_t) tv_sec_lo + ((uint64_t) tv_sec_hi << 32);
+    wl->sync[index].sbc = wl->user_sbc;
+    wl->sync[index].ust = sec * 1000000LL + (uint64_t) tv_nsec / 1000;
+    wl->sync[index].msc = (uint64_t) seq_lo + ((uint64_t) seq_hi << 32);
+    wl->sync[index].refresh_usec = (uint64_t)refresh_nsec/1000;
+    wl->sync[index].filled = true;
+}
+
+static void feedback_discarded(void *data, struct wp_presentation_feedback *fback)
+{
+    wp_presentation_feedback_destroy(fback);
+}
+
+static const struct wp_presentation_feedback_listener feedback_listener = {
+    feedback_sync_output,
+    feedback_presented,
+    feedback_discarded,
+};
+
 static void wayland_vk_swap_buffers(struct ra_ctx *ctx)
 {
     struct vo_wayland_state *wl = ctx->vo->wl;
 
+    if (wl->presentation) {
+        wl->feedback = wp_presentation_feedback(wl->presentation, wl->surface);
+        wp_presentation_feedback_add_listener(wl->feedback, &feedback_listener, wl);
+        wl->user_sbc += 1;
+        int index = last_available_sync(wl);
+        if (index < 0)
+            queue_new_sync(wl);
+    }
+
     vo_wayland_wait_frame(wl);
-    wl->callback_wait = true;
+
+    if (wl->presentation)
+        wayland_sync_swap(wl);
+
+    wl->frame_wait = true;
+}
+
+static void wayland_vk_get_vsync(struct ra_ctx *ctx, struct vo_vsync_info *info)
+{
+    struct vo_wayland_state *wl = ctx->vo->wl;
+    if (wl->presentation) {
+        info->vsync_duration = wl->vsync_duration;
+        info->skipped_vsyncs = wl->last_skipped_vsyncs;
+        info->last_queue_display_time = wl->last_queue_display_time;
+    }
 }
 
 static void wayland_vk_uninit(struct ra_ctx *ctx)
@@ -81,6 +157,7 @@ static bool wayland_vk_init(struct ra_ctx *ctx)
 
     struct ra_vk_ctx_params params = {
         .swap_buffers = wayland_vk_swap_buffers,
+        .get_vsync = wayland_vk_get_vsync,
     };
 
     VkInstance inst = vk->vkinst->instance;
-- 
cgit v1.2.3