From 5e38964fbfed38efdcf5c1628ca65d7e3469764a Mon Sep 17 00:00:00 2001
From: John Preston <johnprestonmail@gmail.com>
Date: Thu, 20 May 2021 16:07:19 +0400
Subject: [PATCH] Allow force-disabling OpenGL.

---
 ui/gl/gl_detection.cpp | 13 +++++++++++++
 ui/gl/gl_detection.h   |  2 ++
 2 files changed, 15 insertions(+)

diff --git a/ui/gl/gl_detection.cpp b/ui/gl/gl_detection.cpp
index 5e8797c..ce83b34 100644
--- a/ui/gl/gl_detection.cpp
+++ b/ui/gl/gl_detection.cpp
@@ -16,8 +16,17 @@
 #define LOG_ONCE(x) static auto logged = [&] { LOG(x); return true; };
 
 namespace Ui::GL {
+namespace {
+
+bool ForceDisabled/* = false*/;
+
+} // namespace
 
 Capabilities CheckCapabilities(QWidget *widget) {
+	if (ForceDisabled) {
+		LOG_ONCE(("OpenGL: Force-disabled."));
+		return {};
+	}
 	auto format = QSurfaceFormat();
 	format.setAlphaBufferSize(8);
 	if (widget) {
@@ -73,4 +82,8 @@ Capabilities CheckCapabilities(QWidget *widget) {
 	return result;
 }
 
+void ForceDisable(bool disable) {
+	ForceDisabled = disable;
+}
+
 } // namespace Ui::GL
diff --git a/ui/gl/gl_detection.h b/ui/gl/gl_detection.h
index 1001e47..a9a55a5 100644
--- a/ui/gl/gl_detection.h
+++ b/ui/gl/gl_detection.h
@@ -17,4 +17,6 @@ struct Capabilities {
 
 [[nodiscard]] Capabilities CheckCapabilities(QWidget *widget = nullptr);
 
+void ForceDisable(bool disable);
+
 } // namespace Ui::GL