[Libreoffice-commits] core.git: include/vcl vcl/source

[Miklos Vajna]

 include/vcl/opengl/OpenGLContext.hxx |    1 +
 vcl/source/opengl/OpenGLContext.cxx  |   29 ++++++++++++++++++++++-------
 2 files changed, 23 insertions(+), 7 deletions(-)

New commits:
commit a00df90e1838ac66587376cffb5780f80b0af94b
Author: Miklos Vajna <vmiklos at collabora.co.uk>
Date:   Fri Aug 14 09:57:53 2015 +0200

    vcl opengl: fix setting up debug context on Windows
    
    At least with my AMD card, in case of SAL_FORCEGL=1 the startup crashes
    quite early. DrMemory says:
    
    ~~Dr.M~~ Error #1: UNADDRESSABLE ACCESS: writing 0x00001414-0x00001415 1 byte(s)
    ~~Dr.M~~ # 0 atioglxx.dll!DrvPresentBuffers                          +0xd6ea6  (0x09a248f6 <atioglxx.dll+0x1248f6>)
    ~~Dr.M~~ # 1 atioglxx.dll!DrvPresentBuffers                          +0x3c069c (0x09d0e0ed <atioglxx.dll+0x40e0ed>)
    ~~Dr.M~~ # 2 vcllo.dll!OpenGLContext::InitGLEW                        [c:\lo\master\vcl\source\opengl\openglcontext.cxx:949]
    ~~Dr.M~~ # 3 vcllo.dll!OpenGLContext::ImplInit                        [c:\lo\master\vcl\source\opengl\openglcontext.cxx:866]
    ~~Dr.M~~ # 4 vcllo.dll!OpenGLContext::init                            [c:\lo\master\vcl\source\opengl\openglcontext.cxx:786]
    ~~Dr.M~~ # 5 vcllo.dll!WinOpenGLSalGraphicsImpl::CreateWinContext     [c:\lo\master\vcl\opengl\win\gdiimpl.cxx:36]
    
    Turns out that in order to enable the GL_DEBUG_OUTPUT_SYNCHRONOUS_ARB
    extension, the GL context must be created with WGL_CONTEXT_DEBUG_BIT_ARB
    set. It seems that other drivers did not enforce this so far, but in
    this case the driver just crashes without this.
    
    Fix the problem by splitting out the debug setup part of InitGLEW() into
    a new InitGLEWDebugging(), and at least on Windows call it only after
    wglCreateContextAttribsARB() and wglMakeCurrent(). Additionally make
    sure that in the debug case the necessary flag is passed to
    wglCreateContextAttribsARB().
    
    Change-Id: I6b77e0c06fd85fdae0386a0801f1de1838524586
    Reviewed-on: https://gerrit.libreoffice.org/17750
    Reviewed-by: Miklos Vajna <vmiklos at collabora.co.uk>
    Tested-by: Miklos Vajna <vmiklos at collabora.co.uk>

diff --git a/include/vcl/opengl/OpenGLContext.hxx b/include/vcl/opengl/OpenGLContext.hxx
index 94ba1ed..2f14762 100644
--- a/include/vcl/opengl/OpenGLContext.hxx
+++ b/include/vcl/opengl/OpenGLContext.hxx
@@ -234,6 +234,7 @@ public:
 
 private:
     SAL_DLLPRIVATE bool InitGLEW();
+    SAL_DLLPRIVATE void InitGLEWDebugging();
     SAL_DLLPRIVATE bool initWindow();
     SAL_DLLPRIVATE bool ImplInit();
 #if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID && !defined(LIBO_HEADLESS)
diff --git a/vcl/source/opengl/OpenGLContext.cxx b/vcl/source/opengl/OpenGLContext.cxx
index c106067..051b151 100644
--- a/vcl/source/opengl/OpenGLContext.cxx
+++ b/vcl/source/opengl/OpenGLContext.cxx
@@ -771,7 +771,9 @@ bool OpenGLContext::ImplInit()
         }
     }
 
-    return InitGLEW();
+    bool bRet = InitGLEW();
+    InitGLEWDebugging();
+    return bRet;
 }
 
 #elif defined( _WIN32 )
@@ -875,7 +877,14 @@ bool OpenGLContext::ImplInit()
 
     // now setup the shared context; this needs a temporary context already
     // set up in order to work
-    m_aGLWin.hRC = wglCreateContextAttribsARB(m_aGLWin.hDC, hSharedCtx, NULL);
+    int attribs [] =
+    {
+#ifdef DBG_UTIL
+        WGL_CONTEXT_FLAGS_ARB, WGL_CONTEXT_DEBUG_BIT_ARB,
+#endif
+        0
+    };
+    m_aGLWin.hRC = wglCreateContextAttribsARB(m_aGLWin.hDC, hSharedCtx, attribs);
     if (m_aGLWin.hRC == 0)
     {
         ImplWriteLastError(GetLastError(), "wglCreateContextAttribsARB in OpenGLContext::ImplInit");
@@ -884,6 +893,7 @@ bool OpenGLContext::ImplInit()
     }
 
     wglMakeCurrent(NULL, NULL);
+    InitGLEWDebugging();
     wglDeleteContext(hTempRC);
 
     if (!wglMakeCurrent(m_aGLWin.hDC, m_aGLWin.hRC))
@@ -911,7 +921,9 @@ bool OpenGLContext::ImplInit()
     NSOpenGLView* pView = getOpenGLView();
     OpenGLWrapper::makeCurrent(pView);
 
-    return InitGLEW();
+    bool bRet = InitGLEW();
+    InitGLEWDebugging();
+    return bRet;
 }
 
 #else
@@ -940,6 +952,13 @@ bool OpenGLContext::InitGLEW()
             bGlewInit = true;
     }
 
+    SAL_INFO("vcl.opengl", "OpenGLContext::ImplInit----end");
+    mbInitialized = true;
+    return true;
+}
+
+void OpenGLContext::InitGLEWDebugging()
+{
 #ifdef DBG_UTIL
     // only enable debug output in dbgutil build
     if( GLEW_ARB_debug_output)
@@ -957,10 +976,6 @@ bool OpenGLContext::InitGLEW()
     }
 
 #endif
-
-    SAL_INFO("vcl.opengl", "OpenGLContext::ImplInit----end");
-    mbInitialized = true;
-    return true;
 }
 
 void OpenGLContext::setWinPosAndSize(const Point &rPos, const Size& rSize)