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From 789d16a9d5aa57b201e9d6be9427671f48fec5e4 Mon Sep 17 00:00:00 2001
From: Jeff Wannamaker <jeff_wannamaker@cable.comcast.com>
Date: Thu, 19 Jan 2017 18:56:07 +0000
Subject: [PATCH 13/18] Implement triple buffering for wayland
Change from double to triple buffering for wayland.
This enables higher frame rates without tearing artifacts
by allowing both the glFinish and the buffer release
interlock to operate without pushing the frame period
to two vertical intervals
Signed-off-by: Jeff Wannamaker <jeff_wannamaker@cable.comcast.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
---
interface/khronos/egl/egl_client.c | 3 ++-
interface/khronos/egl/egl_client_surface.c | 8 ++++++++
interface/khronos/egl/egl_client_surface.h | 11 +++++++++++
3 files changed, 21 insertions(+), 1 deletion(-)
diff --git a/interface/khronos/egl/egl_client.c b/interface/khronos/egl/egl_client.c
index 13a110c..0380274 100644
--- a/interface/khronos/egl/egl_client.c
+++ b/interface/khronos/egl/egl_client.c
@@ -2323,7 +2323,8 @@ EGLAPI EGLBoolean EGLAPIENTRY eglSwapBuffers(EGLDisplay dpy, EGLSurface surf)
buffer_temp = surface->front_wl_buffer;
surface->front_wl_buffer = surface->back_wl_buffer;
- surface->back_wl_buffer = buffer_temp;
+ surface->back_wl_buffer = surface->middle_wl_buffer;
+ surface->middle_wl_buffer = buffer_temp;
configid = egl_config_to_id(surface->config);
color = egl_config_get_color_format(configid);
diff --git a/interface/khronos/egl/egl_client_surface.c b/interface/khronos/egl/egl_client_surface.c
index 9a9582c..10b3b04 100644
--- a/interface/khronos/egl/egl_client_surface.c
+++ b/interface/khronos/egl/egl_client_surface.c
@@ -402,12 +402,14 @@ EGL_SURFACE_T *egl_surface_create(
if (type == WINDOW && wl_display) {
surface->wl_egl_window = (struct wl_egl_window*)win;
surface->front_wl_buffer = NULL;
+ surface->middle_wl_buffer = NULL;
surface->back_wl_buffer = allocate_wl_buffer(
surface->wl_egl_window, color);
resource = surface->back_wl_buffer->resource;
} else {
surface->wl_egl_window = NULL;
surface->front_wl_buffer = NULL;
+ surface->middle_wl_buffer = NULL;
surface->back_wl_buffer = NULL;
resource = DISPMANX_NO_HANDLE;
}
@@ -696,6 +698,12 @@ void egl_surface_free(EGL_SURFACE_T *surface)
surface->back_wl_buffer = 0;
}
+ if (surface->middle_wl_buffer) {
+ wl_buffer_destroy(surface->middle_wl_buffer->wl_buffer);
+ free(surface->middle_wl_buffer);
+ surface->middle_wl_buffer = 0;
+ }
+
if (surface->front_wl_buffer) {
wl_buffer_destroy(surface->front_wl_buffer->wl_buffer);
free(surface->front_wl_buffer);
diff --git a/interface/khronos/egl/egl_client_surface.h b/interface/khronos/egl/egl_client_surface.h
index e328b77..58a3184 100644
--- a/interface/khronos/egl/egl_client_surface.h
+++ b/interface/khronos/egl/egl_client_surface.h
@@ -312,6 +312,17 @@ typedef struct {
*/
struct wl_dispmanx_client_buffer *front_wl_buffer;
+ /*
+ middle_wl_buffer
+
+ Validity:
+ type == WINDOW
+
+ Invariant:
+ client-side information about the wl_buffer in the middle
+ */
+ struct wl_dispmanx_client_buffer *middle_wl_buffer;
+
/*
back_wl_buffer
--
2.21.0
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