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Bug 4470

Summary: CGContext: invalid context 0x0
Product: SDL Reporter: sabino.paulicelli
Component: renderAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: major    
Priority: P2 CC: amaranth72, pauli.jokela, seant29373
Version: 2.0.9   
Hardware: x86_64   
OS: Other   

Description sabino.paulicelli 2019-01-24 20:00:00 UTC 
Cannot clear with a renderer.
Issue on Mac OS X 10.14 (.2 and .3)

xcode log:
2019-01-24 20:51:47.317633+0100 SDL-Swift-Game-Engine[9020:334746] [SDL-Swift-Game-Engine] CGContextSetFillColorWithColor: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
2019-01-24 20:51:47.317687+0100 SDL-Swift-Game-Engine[9020:334746] [SDL-Swift-Game-Engine] CGContextGetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
2019-01-24 20:51:47.317703+0100 SDL-Swift-Game-Engine[9020:334746] [SDL-Swift-Game-Engine] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
2019-01-24 20:51:47.317714+0100 SDL-Swift-Game-Engine[9020:334746] [SDL-Swift-Game-Engine] CGContextFillRects: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
2019-01-24 20:51:47.317730+0100 SDL-Swift-Game-Engine[9020:334746] [SDL-Swift-Game-Engine] CGContextSetCompositeOperation: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.

Also reported (unanswered) on Stack Overflow at https://stackoverflow.com/q/53963463/4242891
Comment 1 sabino.paulicelli 2019-01-24 20:01:08 UTC 
Sorry for any mistake or missed info. This is my first bug report.

:]
Comment 2 sabino.paulicelli 2019-01-24 20:21:15 UTC 
I also replicated this using the example at https://wiki.libsdl.org/SDL_CreateRenderer written in C
Comment 3 Sean 2019-04-28 13:50:32 UTC 
I'm getting the same error on OSX Mojave 10.14.4.

If I set the environment variable CG_CONTEXT_SHOW_BACKTRACE=1, then I get a larger stack trace:

2019-04-28 09:20:38.220672-0400 game[17831:2297463] [game] CGContextSetFillColorWithColor: invalid context 0x0. Backtrace:
  <_setColorWithFillAndStroke+152>
   <-[SDLView drawRect:]+45>
    <-[_NSOpenGLViewBackingLayer display]+901>
     <_ZN2CA5Layer17display_if_neededEPNS_11TransactionE+627>
      <_ZN2CA7Context18commit_transactionEPNS_11TransactionE+342>
       <_ZN2CA11Transaction6commitEv+588>
        <__65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke+274>
         <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+23>
          <__CFRunLoopDoObservers+451>
           <__CFRunLoopRun+1136>
            <CFRunLoopRunSpecific+455>
             <RunCurrentEventLoopInMode+292>
              <ReceiveNextEventCommon+355>
               <_BlockUntilNextEventMatchingListInModeWithFilter+64>
                <_DPSNextEvent+965>
                 <-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+1361>
                  <Cocoa_PumpEvents+138>
                   <SDL_WaitEventTimeout_REAL+203>
                    <event_pump+59>
                     <event_loop+768>
                      <main+2067>
                       <start+1>                               1
2019-04-28 09:20:38.223688-0400 game[17831:2297463] [game] CGContextGetCompositeOperation: invalid context 0x0. Backtrace:
  <CGContextGetCompositeOperation+45>
   <NSRectFill+154>
    <-[SDLView drawRect:]+70>
     <-[_NSOpenGLViewBackingLayer display]+901>
      <_ZN2CA5Layer17display_if_neededEPNS_11TransactionE+627>
       <_ZN2CA7Context18commit_transactionEPNS_11TransactionE+342>
        <_ZN2CA11Transaction6commitEv+588>
         <__65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke+274>
          <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+23>
           <__CFRunLoopDoObservers+451>
            <__CFRunLoopRun+1136>
             <CFRunLoopRunSpecific+455>
              <RunCurrentEventLoopInMode+292>
               <ReceiveNextEventCommon+355>
                <_BlockUntilNextEventMatchingListInModeWithFilter+64>
                 <_DPSNextEvent+965>
                  <-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+1361>
                   <Cocoa_PumpEvents+138>
                    <SDL_WaitEventTimeout_REAL+203>
                     <event_pump+59>
                      <event_loop+768>
                       <main+2067>
                        <start+1>                                1
2019-04-28 09:20:38.224341-0400 game[17831:2297463] [game] CGContextSetCompositeOperation: invalid context 0x0. Backtrace:
  <NSRectFill+209>
   <-[SDLView drawRect:]+70>
    <-[_NSOpenGLViewBackingLayer display]+901>
     <_ZN2CA5Layer17display_if_neededEPNS_11TransactionE+627>
      <_ZN2CA7Context18commit_transactionEPNS_11TransactionE+342>
       <_ZN2CA11Transaction6commitEv+588>
        <__65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke+274>
         <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+23>
          <__CFRunLoopDoObservers+451>
           <__CFRunLoopRun+1136>
            <CFRunLoopRunSpecific+455>
             <RunCurrentEventLoopInMode+292>
              <ReceiveNextEventCommon+355>
               <_BlockUntilNextEventMatchingListInModeWithFilter+64>
                <_DPSNextEvent+965>
                 <-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+1361>
                  <Cocoa_PumpEvents+138>
                   <SDL_WaitEventTimeout_REAL+203>
                    <event_pump+59>
                     <event_loop+768>
                      <main+2067>
                       <start+1>                               1
2019-04-28 09:20:38.224992-0400 game[17831:2297463] [game] CGContextFillRects: invalid context 0x0. Backtrace:
  <CGContextFillRect+105>
   <NSRectFill+237>
    <-[SDLView drawRect:]+70>
     <-[_NSOpenGLViewBackingLayer display]+901>
      <_ZN2CA5Layer17display_if_neededEPNS_11TransactionE+627>
       <_ZN2CA7Context18commit_transactionEPNS_11TransactionE+342>
        <_ZN2CA11Transaction6commitEv+588>
         <__65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke+274>
          <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+23>
           <__CFRunLoopDoObservers+451>
            <__CFRunLoopRun+1136>
             <CFRunLoopRunSpecific+455>
              <RunCurrentEventLoopInMode+292>
               <ReceiveNextEventCommon+355>
                <_BlockUntilNextEventMatchingListInModeWithFilter+64>
                 <_DPSNextEvent+965>
                  <-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+1361>
                   <Cocoa_PumpEvents+138>
                    <SDL_WaitEventTimeout_REAL+203>
                     <event_pump+59>
                      <event_loop+768>
                       <main+2067>
                        <start+1>                                1
2019-04-28 09:20:38.225645-0400 game[17831:2297463] [game] CGContextSetCompositeOperation: invalid context 0x0. Backtrace:
  <NSRectFill+252>
   <-[SDLView drawRect:]+70>
    <-[_NSOpenGLViewBackingLayer display]+901>
     <_ZN2CA5Layer17display_if_neededEPNS_11TransactionE+627>
      <_ZN2CA7Context18commit_transactionEPNS_11TransactionE+342>
       <_ZN2CA11Transaction6commitEv+588>
        <__65+[CATransaction(NSCATransaction) NS_setFlushesWithDisplayRefresh]_block_invoke+274>
         <__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__+23>
          <__CFRunLoopDoObservers+451>
           <__CFRunLoopRun+1136>
            <CFRunLoopRunSpecific+455>
             <RunCurrentEventLoopInMode+292>
              <ReceiveNextEventCommon+355>
               <_BlockUntilNextEventMatchingListInModeWithFilter+64>
                <_DPSNextEvent+965>
                 <-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:]+1361>
                  <Cocoa_PumpEvents+138>
                   <SDL_WaitEventTimeout_REAL+203>
                    <event_pump+59>
                     <event_loop+768>
                      <main+2067>
                       <start+1>                               1


(tart, main, event_loop, and event_pump is all my code... I'm calling SDL_PollEvent inside event_pump)
Comment 4 Alex Szpakowski 2019-10-14 03:53:32 UTC 
https://hg.libsdl.org/SDL/rev/065b94926987 should fix it.