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[client/host] added new asyncronous memory copy

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This changes the method of the memory copy from the host application to
the guest. Instead of performing a full copy from the capture device
into shared memory, and then flagging the new frame, we instead set a
write pointer, flag the client that there is a new frame and then copy
in chunks of 1024 bytes until the entire frame is copied. The client
upon seeing the new frame flag begins to poll at high frequency the
write pointer and upon each update copies as much as it can into the
texture.

This should improve latency but also slightly increase CPU usage on the
client due to the high frequency polling.
This commit is contained in:
Geoffrey McRae
2019-10-01 23:17:20 +10:00
parent 6d2c464436
commit bca54ab1f6
17 changed files with 358 additions and 277 deletions
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10
client/renderers/EGL/desktop.c
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@@ -60,7 +60,7 @@ struct EGL_Desktop
enum EGL_PixelFormat pixFmt;
unsigned int width, height;
unsigned int pitch;
const uint8_t * data;
FrameBuffer frame;
bool update;
// night vision
@@ -181,7 +181,7 @@ void egl_desktop_free(EGL_Desktop ** desktop)
*desktop = NULL;
}
bool egl_desktop_prepare_update(EGL_Desktop * desktop, const bool sourceChanged, const LG_RendererFormat format, const uint8_t * data)
bool egl_desktop_prepare_update(EGL_Desktop * desktop, const bool sourceChanged, const LG_RendererFormat format, const FrameBuffer frame)
{
if (sourceChanged)
{
@@ -217,7 +217,7 @@ bool egl_desktop_prepare_update(EGL_Desktop * desktop, const bool sourceChanged,
desktop->width = format.width;
desktop->height = format.height;
desktop->pitch = format.pitch;
desktop->data = data;
desktop->frame = frame;
desktop->update = true;
/* defer the actual update as the format has changed and we need to issue GL commands first */
@@ -226,7 +226,7 @@ bool egl_desktop_prepare_update(EGL_Desktop * desktop, const bool sourceChanged,
}
/* update the texture now */
return egl_texture_update(desktop->texture, data);
return egl_texture_update_from_frame(desktop->texture, frame);
}
void egl_desktop_perform_update(EGL_Desktop * desktop, const bool sourceChanged)
@@ -253,7 +253,7 @@ void egl_desktop_perform_update(EGL_Desktop * desktop, const bool sourceChanged)
if (desktop->update)
{
desktop->update = false;
egl_texture_update(desktop->texture, desktop->data);
egl_texture_update_from_frame(desktop->texture, desktop->frame);
}
}