Fix errors when reattaching video with some video cards

With ATI cards, deleting a wxGLContext seems to invalidate ALL
wxGlContexts, rather than just things associated with the deleted one.
This resulted in video breaking after closing the detached video dialog,
as the embedded video display was trying to use an invalidated context.
To work around this, delete and recreate the context when reattaching
video.

Also recreate the visual typesetting tool as OpenGLText holds references
to textures created on construction.

Originally committed to SVN as r6646.

aegisub/src/dialog_detached_video.cpp

@@ -100,11 +100,18 @@ DialogDetachedVideo::DialogDetachedVideo(agi::Context *context)
 DialogDetachedVideo::~DialogDetachedVideo() { }
 
 void DialogDetachedVideo::OnClose(wxCloseEvent &evt) {
-	evt.Skip();
+	// Deleting a GL context seems to invalidate ALL contexts, so we need to
+	// delete both the detached and undetached contexts here, then recreate
+	// the undetached one later
+	context->videoDisplay->Destroy();
+	old_display->Reload();
+
 	context->videoDisplay = old_display;
 	context->videoSlider = old_slider;
+
 	OPT_SET("Video/Detached/Enabled")->SetBool(false);
-	context->videoController->Reload();
+
+	evt.Skip();
 }
 
 void DialogDetachedVideo::OnMinimize(wxIconizeEvent &event) {

aegisub/src/frame_main.cpp

@@ -439,6 +439,7 @@ void FrameMain::OnVideoOpen() {
 		try {
 			context->audioController->OpenAudio(context->videoController->GetVideoName());
 		}
+		catch (agi::UserCancelException const&) { }
 		// Opening a video with no audio data isn't an error, so just log
 		// and move on
 		catch (agi::FileNotAccessibleError const&) {

aegisub/src/video_context.cpp

@@ -202,12 +202,9 @@ void VideoContext::SetVideo(const wxString &filename) {
 		config::mru->Add("Video", STD_STR(filename));
 		StandardPaths::SetPathValue("?video", wxFileName(filename).GetPath());
 
-		// Get frame
-		frame_n = 0;
-
 		// Show warning
 		wxString warning = videoProvider->GetWarning();
-		if (!warning.empty()) wxMessageBox(warning,"Warning",wxICON_WARNING | wxOK);
+		if (!warning.empty()) wxMessageBox(warning, "Warning", wxICON_WARNING | wxOK);
 
 		hasSubtitles = false;
 		if (filename.Right(4).Lower() == ".mkv") {
@@ -230,6 +227,8 @@ void VideoContext::SetVideo(const wxString &filename) {
 
 	if (commit_subs)
 		context->ass->Commit(_("change script resolution"), AssFile::COMMIT_SCRIPTINFO);
+	else
+		JumpToFrame(0);
 }
 
 void VideoContext::Reload() {

aegisub/src/video_display.cpp

@@ -114,7 +114,7 @@ VideoDisplay::VideoDisplay(
 	zoomBox->Bind(wxEVT_COMMAND_TEXT_ENTER, &VideoDisplay::SetZoomFromBoxText, this);
 
 	con->videoController->Bind(EVT_FRAME_READY, &VideoDisplay::UploadFrameData, this);
-	slots.push_back(con->videoController->AddVideoOpenListener(&VideoDisplay::OnVideoOpen, this));
+	slots.push_back(con->videoController->AddVideoOpenListener(&VideoDisplay::UpdateSize, this, false));
 	slots.push_back(con->videoController->AddARChangeListener(&VideoDisplay::UpdateSize, this, true));
 
 	Bind(wxEVT_PAINT, std::tr1::bind(&VideoDisplay::Render, this));
@@ -133,8 +133,9 @@ VideoDisplay::VideoDisplay(
 
 	c->videoDisplay = this;
 
+	UpdateSize();
 	if (con->videoController->IsLoaded())
-		OnVideoOpen();
+		con->videoController->JumpToFrame(con->videoController->GetFrameN());
 }
 
 VideoDisplay::~VideoDisplay () {
@@ -158,11 +159,17 @@ bool VideoDisplay::InitContext() {
 }
 
 void VideoDisplay::UploadFrameData(FrameReadyEvent &evt) {
-	if (!InitContext()) return;
+	if (!InitContext()) {
+		evt.Skip();
+		return;
+	}
 
 	if (!videoOut)
 		videoOut.reset(new VideoOutGL);
 
+	if (!tool)
+		cmd::call("video/tool/cross", con);
+
 	try {
 		videoOut->UploadFrameData(*evt.frame);
 	}
@@ -183,14 +190,6 @@ void VideoDisplay::UploadFrameData(FrameReadyEvent &evt) {
 	Render();
 }
 
-void VideoDisplay::OnVideoOpen() {
-	if (!con->videoController->IsLoaded()) return;
-	if (!tool)
-		cmd::call("video/tool/cross", con);
-	UpdateSize();
-	con->videoController->JumpToFrame(0);
-}
-
 void VideoDisplay::Render() try {
 	if (!con->videoController->IsLoaded() || !videoOut || !InitContext() )
 		return;
@@ -221,7 +220,7 @@ void VideoDisplay::Render() try {
 		}
 	}
 
-	if (mouse_pos || alwaysShowTools->GetBool())
+	if ((mouse_pos || alwaysShowTools->GetBool()) && tool)
 		tool->Draw();
 
 	SwapBuffers();
@@ -273,8 +272,7 @@ void VideoDisplay::DrawOverscanMask(float horizontal_percent, float vertical_per
 }
 
 void VideoDisplay::UpdateSize(bool force) {
-	if (!con->videoController->IsLoaded()) return;
-	if (!IsShownOnScreen()) return;
+	if (!con->videoController->IsLoaded() || !IsShownOnScreen()) return;
 
 	int vidW = con->videoController->GetWidth();
 	int vidH = con->videoController->GetHeight();
@@ -359,7 +357,7 @@ void VideoDisplay::UpdateSize(bool force) {
 		}
 	}
 
-	if (tool.get())
+	if (tool)
 		tool->SetDisplayArea(viewport_left, viewport_top, viewport_width, viewport_height);
 
 	Refresh(false);
@@ -378,12 +376,14 @@ void VideoDisplay::OnMouseEvent(wxMouseEvent& event) {
 
 	mouse_pos = event.GetPosition();
 
-	tool->OnMouseEvent(event);
+	if (tool)
+		tool->OnMouseEvent(event);
 }
 
 void VideoDisplay::OnMouseLeave(wxMouseEvent& event) {
 	mouse_pos = Vector2D();
-	tool->OnMouseEvent(event);
+	if (tool)
+		tool->OnMouseEvent(event);
 }
 
 void VideoDisplay::OnMouseWheel(wxMouseEvent& event) {
@@ -449,3 +449,12 @@ bool VideoDisplay::ToolIsType(std::type_info const& type) const {
 Vector2D VideoDisplay::GetMousePosition() const {
 	return mouse_pos ? tool->ToScriptCoords(mouse_pos) : mouse_pos;
 }
+
+void VideoDisplay::Reload() {
+	glContext.reset();
+	videoOut.reset();
+	tool.reset();
+
+	if (con->videoController->IsLoaded())
+		con->videoController->JumpToFrame(con->videoController->GetFrameN());
+}

aegisub/src/video_display.h

@@ -127,8 +127,6 @@ class VideoDisplay : public wxGLCanvas {
 	/// @return Could the context be set?
 	bool InitContext();
 
-	void OnVideoOpen();
-
 	/// @brief Set the size of the display based on the current zoom and video resolution
 	/// @param force Force the size to be set based on zoom even in detached mode
 	void UpdateSize(bool force = false);
@@ -172,4 +170,7 @@ public:
 	void SetTool(VisualToolBase *new_tool);
 
 	bool ToolIsType(std::type_info const& type) const;
+
+	/// Discard all OpenGL state
+	void Reload();
 };