Make gl contexts specific to VideoDisplays and only create/use them when the display is shown. Fixes a pile of X11-related assertion failures.

Originally committed to SVN as r4686.

aegisub/src/video_context.cpp

@@ -86,9 +86,7 @@ END_EVENT_TABLE()
 /// @brief Constructor 
 ///
 VideoContext::VideoContext()
-: ownGlContext(false)
-, glContext(NULL)
-, startFrame(-1)
+: startFrame(-1)
 , endFrame(-1)
 , playNextFrame(-1)
 , nextFrame(-1)
@@ -113,8 +111,6 @@ VideoContext::~VideoContext () {
 		delete audio->player;
 	}
 	tempFrame.Clear();
-	if (ownGlContext)
-		delete glContext;
 }
 
 VideoContext *VideoContext::Get() {
@@ -143,8 +139,6 @@ void VideoContext::Reset() {
 	isPlaying = false;
 	nextFrame = -1;
 
-	UpdateDisplays(true);
-
 	// Clean up video data
 	videoName.clear();
 	tempFrame.Clear();
@@ -162,9 +156,6 @@ void VideoContext::SetVideo(const wxString &filename) {
 	try {
 		grid->CommitChanges(true);
 
-		// Set GL context
-		GetGLContext(displayList.front())->SetCurrent(*displayList.front());
-
 		// Choose a provider
 		provider.reset(VideoProviderFactoryManager::GetProvider(filename));
 
@@ -286,14 +277,6 @@ void VideoContext::JumpToTime(int ms, agi::vfr::Time end) {
 	JumpToFrame(FrameAtTime(ms, end));
 }
 
-wxGLContext *VideoContext::GetGLContext(wxGLCanvas *canvas) {
-	if (!glContext) {
-		glContext = new wxGLContext(canvas);
-		ownGlContext = true;
-	}
-	return glContext;
-}
-
 AegiVideoFrame VideoContext::GetFrame(int n,bool raw) {
 	// Current frame if -1
 	if (n == -1) n = frame_n;

aegisub/src/video_context.h

@@ -86,12 +86,6 @@ private:
 	/// DOCME
 	std::list<VideoDisplay*> displayList;
 
-	/// DOCME
-	bool ownGlContext;
-
-	/// DOCME
-	wxGLContext *glContext;
-
 	/// DOCME
 	AegiVideoFrame tempFrame;
 
@@ -185,8 +179,6 @@ public:
 	/// @param raw Should the frame have subtitles?
 	void SaveSnapshot(bool raw);
 
-	wxGLContext *GetGLContext(wxGLCanvas *canvas);
-
 	/// @brief Is there a video loaded?
 	bool IsLoaded() const { return !!provider.get(); }
 

aegisub/src/video_display.cpp

@@ -148,6 +148,15 @@ VideoDisplay::~VideoDisplay () {
 	VideoContext::Get()->RemoveDisplay(this);
 }
 
+bool VideoDisplay::InitContext() {
+	if (!IsShownOnScreen()) return false;
+	if (!glContext.get()) {
+		glContext.reset(new wxGLContext(this));
+	}
+	SetCurrent(*glContext.get());
+	return true;
+}
+
 void VideoDisplay::ShowCursor(bool show) {
 	if (show) {
 		SetCursor(wxNullCursor);
@@ -212,6 +221,7 @@ void VideoDisplay::SetFrame(int frameNumber) {
 }
 
 void VideoDisplay::UploadFrameData() {
+	if (!InitContext()) return;
 	VideoContext *context = VideoContext::Get();
 	AegiVideoFrame frame;
 	try {
@@ -247,8 +257,9 @@ void VideoDisplay::UploadFrameData() {
 }
 
 void VideoDisplay::Refresh() {
-	UploadFrameData();
 	if (!tool.get()) tool.reset(new VisualToolCross(this, video, toolBar));
+	if (!InitContext()) return;
+	UploadFrameData();
 	tool->Refresh();
 	Render();
 }
@@ -258,14 +269,12 @@ void VideoDisplay::SetFrameRange(int from, int to) {
 }
 
 void VideoDisplay::Render() try {
-	if (!IsShownOnScreen()) return;
+	if (!InitContext()) return;
 	VideoContext *context = VideoContext::Get();
 	if (!context->IsLoaded()) return;
 	assert(wxIsMainThread());
 	assert(w > 0);
 
-	SetCurrent(*context->GetGLContext(this));
-
 	videoOut->Render(viewport_x, viewport_bottom, viewport_width, viewport_height);
 	E(glViewport(0, min(viewport_bottom, 0), w, h));
 

aegisub/src/video_display.h

@@ -62,7 +62,7 @@ struct VideoState {
 
 /// @class VideoDisplay
 /// @brief DOCME
-class VideoDisplay: public wxGLCanvas {
+class VideoDisplay : public wxGLCanvas {
 	agi::OptionValue* alwaysShowTools;
 	/// The unscaled size of the displayed video
 	wxSize origSize;
@@ -147,6 +147,13 @@ class VideoDisplay: public wxGLCanvas {
 	/// The toolbar used by individual typesetting tools
 	wxToolBar* toolBar;
 
+	/// The OpenGL context for this display
+	std::auto_ptr<wxGLContext> glContext;
+
+	/// @brief Initialize the gl context and set the active context to this one
+	/// @return Could the context be set?
+	bool InitContext();
+
 
 	void OnMode(const wxCommandEvent &event);
 	void SetMode(int mode);