From 03137086dbb341052121e798ef7895ace19dd685 Mon Sep 17 00:00:00 2001
From: ameerj <52414509+ameerj@users.noreply.github.com>
Date: Tue, 7 Mar 2023 22:33:11 -0500
Subject: OpenGL: Prefer glClientWaitSync for OGLSync objects

At least on Nvidia, glClientWaitSync with a timeout of 0 (non-blocking) is faster than glGetSynciv of GL_SYNC_STATUS.
---
 src/video_core/renderer_opengl/gl_resource_manager.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/video_core/renderer_opengl/gl_resource_manager.cpp')

diff --git a/src/video_core/renderer_opengl/gl_resource_manager.cpp b/src/video_core/renderer_opengl/gl_resource_manager.cpp
index 3a664fdec..eae8fd110 100644
--- a/src/video_core/renderer_opengl/gl_resource_manager.cpp
+++ b/src/video_core/renderer_opengl/gl_resource_manager.cpp
@@ -3,6 +3,7 @@
 
 #include <string_view>
 #include <glad/glad.h>
+#include "common/assert.h"
 #include "common/microprofile.h"
 #include "video_core/renderer_opengl/gl_resource_manager.h"
 #include "video_core/renderer_opengl/gl_shader_util.h"
@@ -158,6 +159,15 @@ void OGLSync::Release() {
     handle = 0;
 }
 
+bool OGLSync::IsSignaled() const noexcept {
+    // At least on Nvidia, glClientWaitSync with a timeout of 0
+    // is faster than glGetSynciv of GL_SYNC_STATUS.
+    // Timeout of 0 means this check is non-blocking.
+    const auto sync_status = glClientWaitSync(handle, 0, 0);
+    ASSERT(sync_status != GL_WAIT_FAILED);
+    return sync_status != GL_TIMEOUT_EXPIRED;
+}
+
 void OGLFramebuffer::Create() {
     if (handle != 0)
         return;
-- 
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