mpv/video/out/vulkan/context_wayland.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include "video/out/gpu/context.h"
#include "video/out/wayland_common.h"
#include "common.h"
#include "context.h"
#include "utils.h"
// Generated from presentation-time.xml
#include "generated/wayland/presentation-time.h"
struct priv {
struct mpvk_ctx vk;
};
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;
vo_wayland_sync_shift(wl);
wayland: refactor presentation time The motivation for this change was a segfault caused by e107342 which has complicated reasons for occuring (i.e. I'm not 100% sure but I think it is a really weird race). The major part of this commit is moving the initialization of presentation listener to the frame_callback function. Calling it in swap_buffers worked fine but in practice it meant a lot of meaningless function calls if a window was hidden (the presentation would just be immediately discarded). By calling it in frame_callback, we ensure the listener is only created when it is possible to receive a presentation event. Of course calling the presentation listener in feedback_presented or feedback_discarded was considered, but ultimately these events are too slow. Receiving the ust/msc/sbc triplet here and then passing it to mpv results in higher vsync judder since there is (likely) not enough time before the next pageflip. By design, the frame callback is meant to give us as much time as possible before the next repaint so calling it here is probably optimal. Additionally, we can make better use of the feedback_discarded event. The wp_presentation_feedback should not be destroyed here. It will be taken care of either when we get feedback again or when the player quits. Instead what we can do is set a bool that tells wayland_sync_swap to update itself based on mp_time delta. In practice, the result is not any different than before, but it should be more understandable what is going on now. Of course, the segfault mentioned at the beginning is fixed with this as well.
2020-08-15 21:07:53 +00:00
if (fback)
wp_presentation_feedback_destroy(fback);
// 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].ust = sec * 1000000LL + (uint64_t) tv_nsec / 1000;
wl->sync[index].msc = (uint64_t) seq_lo + ((uint64_t) seq_hi << 32);
wl->sync[index].filled = true;
}
static void feedback_discarded(void *data, struct wp_presentation_feedback *fback)
{
}
static const struct wp_presentation_feedback_listener feedback_listener = {
feedback_sync_output,
feedback_presented,
feedback_discarded,
};
wayland: refactor presentation time The motivation for this change was a segfault caused by e107342 which has complicated reasons for occuring (i.e. I'm not 100% sure but I think it is a really weird race). The major part of this commit is moving the initialization of presentation listener to the frame_callback function. Calling it in swap_buffers worked fine but in practice it meant a lot of meaningless function calls if a window was hidden (the presentation would just be immediately discarded). By calling it in frame_callback, we ensure the listener is only created when it is possible to receive a presentation event. Of course calling the presentation listener in feedback_presented or feedback_discarded was considered, but ultimately these events are too slow. Receiving the ust/msc/sbc triplet here and then passing it to mpv results in higher vsync judder since there is (likely) not enough time before the next pageflip. By design, the frame callback is meant to give us as much time as possible before the next repaint so calling it here is probably optimal. Additionally, we can make better use of the feedback_discarded event. The wp_presentation_feedback should not be destroyed here. It will be taken care of either when we get feedback again or when the player quits. Instead what we can do is set a bool that tells wayland_sync_swap to update itself based on mp_time delta. In practice, the result is not any different than before, but it should be more understandable what is going on now. Of course, the segfault mentioned at the beginning is fixed with this as well.
2020-08-15 21:07:53 +00:00
static const struct wl_callback_listener frame_listener;
static void frame_callback(void *data, struct wl_callback *callback, uint32_t time)
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
{
wayland: refactor presentation time The motivation for this change was a segfault caused by e107342 which has complicated reasons for occuring (i.e. I'm not 100% sure but I think it is a really weird race). The major part of this commit is moving the initialization of presentation listener to the frame_callback function. Calling it in swap_buffers worked fine but in practice it meant a lot of meaningless function calls if a window was hidden (the presentation would just be immediately discarded). By calling it in frame_callback, we ensure the listener is only created when it is possible to receive a presentation event. Of course calling the presentation listener in feedback_presented or feedback_discarded was considered, but ultimately these events are too slow. Receiving the ust/msc/sbc triplet here and then passing it to mpv results in higher vsync judder since there is (likely) not enough time before the next pageflip. By design, the frame callback is meant to give us as much time as possible before the next repaint so calling it here is probably optimal. Additionally, we can make better use of the feedback_discarded event. The wp_presentation_feedback should not be destroyed here. It will be taken care of either when we get feedback again or when the player quits. Instead what we can do is set a bool that tells wayland_sync_swap to update itself based on mp_time delta. In practice, the result is not any different than before, but it should be more understandable what is going on now. Of course, the segfault mentioned at the beginning is fixed with this as well.
2020-08-15 21:07:53 +00:00
struct vo_wayland_state *wl = data;
if (callback)
wl_callback_destroy(callback);
wl->frame_callback = wl_surface_frame(wl->surface);
wl_callback_add_listener(wl->frame_callback, &frame_listener, wl);
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
if (wl->presentation) {
wl->feedback = wp_presentation_feedback(wl->presentation, wl->surface);
wp_presentation_feedback_add_listener(wl->feedback, &feedback_listener, wl);
}
wayland: refactor presentation time The motivation for this change was a segfault caused by e107342 which has complicated reasons for occuring (i.e. I'm not 100% sure but I think it is a really weird race). The major part of this commit is moving the initialization of presentation listener to the frame_callback function. Calling it in swap_buffers worked fine but in practice it meant a lot of meaningless function calls if a window was hidden (the presentation would just be immediately discarded). By calling it in frame_callback, we ensure the listener is only created when it is possible to receive a presentation event. Of course calling the presentation listener in feedback_presented or feedback_discarded was considered, but ultimately these events are too slow. Receiving the ust/msc/sbc triplet here and then passing it to mpv results in higher vsync judder since there is (likely) not enough time before the next pageflip. By design, the frame callback is meant to give us as much time as possible before the next repaint so calling it here is probably optimal. Additionally, we can make better use of the feedback_discarded event. The wp_presentation_feedback should not be destroyed here. It will be taken care of either when we get feedback again or when the player quits. Instead what we can do is set a bool that tells wayland_sync_swap to update itself based on mp_time delta. In practice, the result is not any different than before, but it should be more understandable what is going on now. Of course, the segfault mentioned at the beginning is fixed with this as well.
2020-08-15 21:07:53 +00:00
wl->frame_wait = false;
}
static const struct wl_callback_listener frame_listener = {
frame_callback,
};
wayland: only render if we have frame callback Back in the olden days, mpv's wayland backend was driven by the frame callback. This had several issues and was removed in favor of the current approach which allowed some advanced features (like display-resample and presentation time) to actually work properly. However as a consequence, it meant that mpv always rendered, even if the surface was hidden. Wayland people consider this "wasteful" (and well they aren't wrong). This commit aims to avoid wasteful rendering by doing some additional checks in the swapchain. There's three main parts to this. 1. Wayland EGL now uses an external swapchain (like the drm context). Before we start a new frame, we check to see if we are waiting on a callback from the compositor. If there is no wait, then go ahead and proceed to render the frame, swap buffers, and then initiate vo_wayland_wait_frame to poll (with a timeout) for the next potential callback. If we are still waiting on callback from the compositor when starting a new frame, then we simple skip rendering it entirely until the surface comes back into view. 2. Wayland on vulkan has essentially the same approach although the details are a little different. The ra_vk_ctx does not have support for an external swapchain and although such a mechanism could theoretically be added, it doesn't make much sense with libplacebo. Instead, start_frame was added as a param and used to check for callback. 3. For wlshm, it's simply a matter of adding frame callback to it, leveraging vo_wayland_wait_frame, and using the frame callback value to whether or not to draw the image.
2020-09-18 17:29:53 +00:00
static bool wayland_vk_start_frame(struct ra_ctx *ctx)
{
struct vo_wayland_state *wl = ctx->vo->wl;
bool render = !wl->hidden || wl->opts->disable_vsync;
wayland: only render if we have frame callback Back in the olden days, mpv's wayland backend was driven by the frame callback. This had several issues and was removed in favor of the current approach which allowed some advanced features (like display-resample and presentation time) to actually work properly. However as a consequence, it meant that mpv always rendered, even if the surface was hidden. Wayland people consider this "wasteful" (and well they aren't wrong). This commit aims to avoid wasteful rendering by doing some additional checks in the swapchain. There's three main parts to this. 1. Wayland EGL now uses an external swapchain (like the drm context). Before we start a new frame, we check to see if we are waiting on a callback from the compositor. If there is no wait, then go ahead and proceed to render the frame, swap buffers, and then initiate vo_wayland_wait_frame to poll (with a timeout) for the next potential callback. If we are still waiting on callback from the compositor when starting a new frame, then we simple skip rendering it entirely until the surface comes back into view. 2. Wayland on vulkan has essentially the same approach although the details are a little different. The ra_vk_ctx does not have support for an external swapchain and although such a mechanism could theoretically be added, it doesn't make much sense with libplacebo. Instead, start_frame was added as a param and used to check for callback. 3. For wlshm, it's simply a matter of adding frame callback to it, leveraging vo_wayland_wait_frame, and using the frame callback value to whether or not to draw the image.
2020-09-18 17:29:53 +00:00
if (wl->frame_wait && wl->presentation)
vo_wayland_sync_clear(wl);
if (render)
wl->frame_wait = true;
return render;
}
wayland: refactor presentation time The motivation for this change was a segfault caused by e107342 which has complicated reasons for occuring (i.e. I'm not 100% sure but I think it is a really weird race). The major part of this commit is moving the initialization of presentation listener to the frame_callback function. Calling it in swap_buffers worked fine but in practice it meant a lot of meaningless function calls if a window was hidden (the presentation would just be immediately discarded). By calling it in frame_callback, we ensure the listener is only created when it is possible to receive a presentation event. Of course calling the presentation listener in feedback_presented or feedback_discarded was considered, but ultimately these events are too slow. Receiving the ust/msc/sbc triplet here and then passing it to mpv results in higher vsync judder since there is (likely) not enough time before the next pageflip. By design, the frame callback is meant to give us as much time as possible before the next repaint so calling it here is probably optimal. Additionally, we can make better use of the feedback_discarded event. The wp_presentation_feedback should not be destroyed here. It will be taken care of either when we get feedback again or when the player quits. Instead what we can do is set a bool that tells wayland_sync_swap to update itself based on mp_time delta. In practice, the result is not any different than before, but it should be more understandable what is going on now. Of course, the segfault mentioned at the beginning is fixed with this as well.
2020-08-15 21:07:53 +00:00
static void wayland_vk_swap_buffers(struct ra_ctx *ctx)
{
struct vo_wayland_state *wl = ctx->vo->wl;
if (!wl->opts->disable_vsync)
vo_wayland_wait_frame(wl);
wayland: only render if we have frame callback Back in the olden days, mpv's wayland backend was driven by the frame callback. This had several issues and was removed in favor of the current approach which allowed some advanced features (like display-resample and presentation time) to actually work properly. However as a consequence, it meant that mpv always rendered, even if the surface was hidden. Wayland people consider this "wasteful" (and well they aren't wrong). This commit aims to avoid wasteful rendering by doing some additional checks in the swapchain. There's three main parts to this. 1. Wayland EGL now uses an external swapchain (like the drm context). Before we start a new frame, we check to see if we are waiting on a callback from the compositor. If there is no wait, then go ahead and proceed to render the frame, swap buffers, and then initiate vo_wayland_wait_frame to poll (with a timeout) for the next potential callback. If we are still waiting on callback from the compositor when starting a new frame, then we simple skip rendering it entirely until the surface comes back into view. 2. Wayland on vulkan has essentially the same approach although the details are a little different. The ra_vk_ctx does not have support for an external swapchain and although such a mechanism could theoretically be added, it doesn't make much sense with libplacebo. Instead, start_frame was added as a param and used to check for callback. 3. For wlshm, it's simply a matter of adding frame callback to it, leveraging vo_wayland_wait_frame, and using the frame callback value to whether or not to draw the image.
2020-09-18 17:29:53 +00:00
if (wl->presentation)
wayland_sync_swap(wl);
}
static void wayland_vk_get_vsync(struct ra_ctx *ctx, struct vo_vsync_info *info)
{
struct vo_wayland_state *wl = ctx->vo->wl;
wayland: use mp_time deltas for presentation time One not-so-nice hack in the wayland code is the assumption of when a window is hidden (out of view from the compositor) and an arbitrary delay for enabling/disabling the usage of presentation time. Since you do not receive any presentation feedback when a window is hidden on wayland (a feature or misfeature depending on who you ask), the ust is updated based on the refresh_nsec statistic gathered from the previous feedback event. The flaw with this is that refresh_nsec basically just reports back the display's refresh rate (1 / refresh_rate * 10^9). It doesn't tell you how long the vsync interval really was. So as a video is left playing out of view, the wl->last_queue_display_time becomes increasingly inaccurate. This led to a vsync spike when bringing the mpv window back into sight after it was hidden for a period of time. The hack for working around this is to just wait a while before enabling presentation time again. The discrepancy between the "bogus" wl->last_queue_display_time and the actual value you get from the feedback only happens initially after a switch. If you just discard those values, you avoid the dramatic vsync spike. It turns out that there's a smarter way to do this. Just use mp_time_us deltas. The whole reason for these hacks is because wl->last_queue_display_time wasn't close enough to how long it would take for a frame to actually display if it wasn't hidden. Instead, mpv's internal timer can be used, and the difference between wayland_sync_swap calls is a close enough proxy for the vsync interval (certainly better than using the monitor's refresh rate). This avoids the entire conundrum of massive vsync spikes when bringing the player back into view, and it means we can get rid of extra crap like wl->hidden.
2020-04-09 16:17:03 +00:00
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;
}
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
}
static void wayland_vk_uninit(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv;
ra_vk_ctx_uninit(ctx);
mpvk_uninit(&p->vk);
vo_wayland_uninit(ctx->vo);
}
static bool wayland_vk_init(struct ra_ctx *ctx)
{
struct priv *p = ctx->priv = talloc_zero(ctx, struct priv);
struct mpvk_ctx *vk = &p->vk;
int msgl = ctx->opts.probing ? MSGL_V : MSGL_ERR;
if (!mpvk_init(vk, ctx, VK_KHR_WAYLAND_SURFACE_EXTENSION_NAME))
goto error;
if (!vo_wayland_init(ctx->vo))
goto error;
VkWaylandSurfaceCreateInfoKHR wlinfo = {
.sType = VK_STRUCTURE_TYPE_WAYLAND_SURFACE_CREATE_INFO_KHR,
.display = ctx->vo->wl->display,
.surface = ctx->vo->wl->surface,
};
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
struct ra_vk_ctx_params params = {
wayland: only render if we have frame callback Back in the olden days, mpv's wayland backend was driven by the frame callback. This had several issues and was removed in favor of the current approach which allowed some advanced features (like display-resample and presentation time) to actually work properly. However as a consequence, it meant that mpv always rendered, even if the surface was hidden. Wayland people consider this "wasteful" (and well they aren't wrong). This commit aims to avoid wasteful rendering by doing some additional checks in the swapchain. There's three main parts to this. 1. Wayland EGL now uses an external swapchain (like the drm context). Before we start a new frame, we check to see if we are waiting on a callback from the compositor. If there is no wait, then go ahead and proceed to render the frame, swap buffers, and then initiate vo_wayland_wait_frame to poll (with a timeout) for the next potential callback. If we are still waiting on callback from the compositor when starting a new frame, then we simple skip rendering it entirely until the surface comes back into view. 2. Wayland on vulkan has essentially the same approach although the details are a little different. The ra_vk_ctx does not have support for an external swapchain and although such a mechanism could theoretically be added, it doesn't make much sense with libplacebo. Instead, start_frame was added as a param and used to check for callback. 3. For wlshm, it's simply a matter of adding frame callback to it, leveraging vo_wayland_wait_frame, and using the frame callback value to whether or not to draw the image.
2020-09-18 17:29:53 +00:00
.start_frame = wayland_vk_start_frame,
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
.swap_buffers = wayland_vk_swap_buffers,
.get_vsync = wayland_vk_get_vsync,
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
};
VkInstance inst = vk->vkinst->instance;
VkResult res = vkCreateWaylandSurfaceKHR(inst, &wlinfo, NULL, &vk->surface);
if (res != VK_SUCCESS) {
MP_MSG(ctx, msgl, "Failed creating Wayland surface\n");
goto error;
}
/* Because in Wayland clients render whenever they receive a callback from
* the compositor, and the fact that the compositor usually stops sending
* callbacks once the surface is no longer visible, using FIFO here would
* mean the entire player would block on acquiring swapchain images. Hence,
* use MAILBOX to guarantee that there'll always be a swapchain image and
* the player won't block waiting on those */
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
if (!ra_vk_ctx_init(ctx, vk, params, VK_PRESENT_MODE_MAILBOX_KHR))
goto error;
ra_add_native_resource(ctx->ra, "wl", ctx->vo->wl->display);
wayland: use callback flag + poll for buffer swap The old way of using wayland in mpv relied on an external renderloop for semi-accurate timings. This had multiple issues though. Display sync would break whenever the window was hidden (since the frame callback stopped being executed) which was really annoying. Also the entire external renderloop logic was kind of fragile and didn't play well with mpv's internal structure (i.e. using presentation time in that old paradigm breaks stats.lua). Basically the problem is that swap buffers blocks on wayland which is crap whenever you hide the mpv window since it looks up the entire player. So you have to make swap buffers not block, but this has a different problem. Timings will be terrible if you use the unblocked swap buffers call. Based on some discussion in #wayland, the trick here is relatively simple and works well enough for our purposes. Instead we basically build a way to block with a timeout in the wayland buffer swap functions. A bool is set in the frame callback function that indicates whether or not mpv is waiting for a frame to be displayed. In the actual buffer swap function, we enter into a while loop waiting for this flag to be set. At the same time, the wl_display is polled to block the thread and wakeup if it receives any events from the compositor. This loop only breaks if enough time has passed or if the frame callback bool is received. In the near future, it is better to set whether or not frame a frame has been displayed in the presentation feedback. However as a first pass, doing it in the frame callback is more than good enough. The "downside" is that we render frames that aren't actually shown on screen when the player is hidden (it seems like wayland people don't like that). But who cares. Accurate timings are way more important. It's probably not too hard to add that behavior back in the player though.
2019-10-07 20:58:36 +00:00
ctx->vo->wl->frame_callback = wl_surface_frame(ctx->vo->wl->surface);
wl_callback_add_listener(ctx->vo->wl->frame_callback, &frame_listener, ctx->vo->wl);
return true;
error:
wayland_vk_uninit(ctx);
return false;
}
static bool resize(struct ra_ctx *ctx)
{
struct vo_wayland_state *wl = ctx->vo->wl;
MP_VERBOSE(wl, "Handling resize on the vk side\n");
const int32_t width = wl->scaling*mp_rect_w(wl->geometry);
const int32_t height = wl->scaling*mp_rect_h(wl->geometry);
if (!ctx->opts.want_alpha) {
struct wl_region *region = wl_compositor_create_region(wl->compositor);
wl_region_add(region, 0, 0, width, height);
wl_surface_set_opaque_region(wl->surface, region);
wl_region_destroy(region);
}
wl_surface_set_buffer_scale(wl->surface, wl->scaling);
bool ok = ra_vk_ctx_resize(ctx, width, height);
if (!wl->vo_opts->fullscreen && !wl->vo_opts->window_maximized)
wl_surface_commit(wl->surface);
return ok;
}
static bool wayland_vk_reconfig(struct ra_ctx *ctx)
{
if (!vo_wayland_reconfig(ctx->vo))
return false;
return true;
}
static int wayland_vk_control(struct ra_ctx *ctx, int *events, int request, void *arg)
{
int ret = vo_wayland_control(ctx->vo, events, request, arg);
if (*events & VO_EVENT_RESIZE) {
if (!resize(ctx))
return VO_ERROR;
}
return ret;
}
static void wayland_vk_wakeup(struct ra_ctx *ctx)
{
vo_wayland_wakeup(ctx->vo);
}
static void wayland_vk_wait_events(struct ra_ctx *ctx, int64_t until_time_us)
{
vo_wayland_wait_events(ctx->vo, until_time_us);
}
const struct ra_ctx_fns ra_ctx_vulkan_wayland = {
.type = "vulkan",
vo_gpu: semi-fix --gpu-context/--gpu-api options and help output This was confusing at best. Change it to output the actual choices. (Seems like in the end it's always me who has to clean up other people's bullshit.) Context names were not unique - but they should be, so fix it. The whole point of the original --opengl-backend option was to side-step the tricky auto-detection, so you know exactly what you get. The goal of this commit is to make --gpu-context work the same way. Fix the non-unique names by appending "vk" to the names. Keep in mind that this was not suitable for slecting the "UI" backend anyway, since "x11" would force GLX, whereas people on not-NVIDIA actually want "x11egl". Users trying to use --gpu-context=x11 to force the X11 backend would always end up with GLX, which would at least break VAAPI hardware decoding for them. Basically the idea that this option could select the "UI" type is completely broken - it selects an implementation, which implies a UI. Selecting the UI type This would require a separate mechanism. (Although in theory this separate mechanism could be part of the --gpu-context option - in any case, someone would have to implement it.) To achieve help output that can actually be understood, just duplicate the code. Most of that code is duplicated anyway, and trying to share just the list code with the result of making the output unreadable doesn't make too much sense. If we wanted to save code/effort, we could just remove the help output altogether. --gpu-api has non-unique entries, and it would be nice to group them (e.g. list all OpenGL capable contexts with "opengl"), but C makes this simple idea too much of a pain, so don't do it. Also remove a stray tab from the android entry on the manpage.
2017-10-16 08:53:33 +00:00
.name = "waylandvk",
.reconfig = wayland_vk_reconfig,
.control = wayland_vk_control,
.wakeup = wayland_vk_wakeup,
.wait_events = wayland_vk_wait_events,
.init = wayland_vk_init,
.uninit = wayland_vk_uninit,
};