尝试解决插件bug

tests/gtest/opengl_readback_guard_test.cpp

@@ -0,0 +1,26 @@
+#include <gtest/gtest.h>
+
+#include <QOpenGLContext>
+#include <QVariant>
+
+#include "render/opengl/openglrenderer.h"
+
+TEST(OpenGLRenderer, DownloadFromTextureWithoutCurrentContext)
+{
+	QOpenGLContext context;
+	ASSERT_TRUE(context.create());
+	ASSERT_EQ(QOpenGLContext::currentContext(), nullptr);
+
+	olive::OpenGLRenderer renderer;
+	renderer.Init(&context);
+
+	olive::VideoParams params(4, 4, olive::core::PixelFormat::U8, 4,
+							  olive::core::rational(1, 1),
+							  olive::VideoParams::kInterlaceNone, 1);
+
+	unsigned char buffer[4 * 4 * 4] = {};
+	renderer.DownloadFromTexture(QVariant::fromValue<GLuint>(0), params,
+								 buffer, 4 * 4);
+
+	EXPECT_EQ(QOpenGLContext::currentContext(), nullptr);
+}