merge initial work on OpenGL vcl backend

The backend builds on Windows, Linux and OSX but still does not render
everything perfectly. Based on this initial framework the remaining
improvements can be made incrementally in master.

Whether the OpenGL code or the normal code is used depends on the OpenGL
configuration variable. It currently defaults to false. Additionally we
check during runtime if the requirements for running the OpenGL backend
are fulfilled.

3 files changed, 48 insertions, 6 deletions

diff --git a/include/vcl/opengl/OpenGLContext.hxx b/include/vcl/opengl/OpenGLContext.hxx
index 4017923c5464..5ca96020fb4d 100644
--- a/include/vcl/opengl/OpenGLContext.hxx
+++ b/include/vcl/opengl/OpenGLContext.hxx
@@ -22,9 +22,12 @@
 #  include "GL/glxew.h"
 #  include <postx.h>
 #elif defined( _WIN32 )
+#ifndef INCLUDED_PRE_POST_WIN_H
+#define INCLUDED_PRE_POST_WIN_H
 #  include "prewin.h"
 #  include "postwin.h"
 #endif
+#endif
 
 #if defined( _WIN32 )
 #include <GL/glext.h>
@@ -99,14 +102,16 @@ struct GLWindow
 #elif defined( IOS )
 #elif defined( ANDROID )
 #elif defined( UNX )
-    Display*           dpy;
-    int                screen;
-    Window             win;
+    Display*            dpy;
+    int                 screen;
+    Window              win;
+    Pixmap              pix;
 #if defined( GLX_EXT_texture_from_pixmap )
     GLXFBConfig        fbc;
 #endif
     XVisualInfo*       vi;
     GLXContext         ctx;
+    GLXPixmap           glPix;
 
     bool HasGLXExtension( const char* name ) { return checkExtension( (const GLubyte*) name, (const GLubyte*) GLXExtensions ); }
     const char*             GLXExtensions;
@@ -117,8 +122,6 @@ struct GLWindow
     const GLubyte*          GLExtensions;
     bool bMultiSampleSupported;
 
-    bool HasGLExtension( const char* name ) { return checkExtension( (const GLubyte*) name, GLExtensions ); }
-
     GLWindow()
         :
 #if defined( _WIN32 )
@@ -134,6 +137,7 @@ struct GLWindow
 #endif
         vi(NULL),
         ctx(0),
+        glPix(0),
         GLXExtensions(NULL),
 #endif
         bpp(0),
@@ -154,10 +158,21 @@ public:
     ~OpenGLContext();
 
     void requestLegacyContext();
+    void requestSingleBufferedRendering();
+    void requestVirtualDevice();
 
     bool init(vcl::Window* pParent = 0);
     bool init(SystemChildWindow* pChildWindow);
 
+// these methods are for the deep platform layer, don't use them in normal code
+// only in vcl's platform code
+#if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID
+    bool init(Display* dpy, Window win, int screen);
+    bool init(Display* dpy, Pixmap pix, unsigned int width, unsigned int height, int nScreen);
+#elif defined( _WIN32 )
+    bool init( HDC hDC, HWND hWnd );
+#endif
+
     void makeCurrent();
     void resetCurrent();
     void swapBuffers();
@@ -166,7 +181,7 @@ public:
 
     void setWinPosAndSize(const Point &rPos, const Size& rSize);
     void setWinSize(const Size& rSize);
-    GLWindow& getOpenGLWindow() { return m_aGLWin;}
+    const GLWindow& getOpenGLWindow() const { return m_aGLWin;}
 
     SystemChildWindow* getChildWindow();
     const SystemChildWindow* getChildWindow() const;
@@ -183,8 +198,12 @@ public:
     static SystemWindowData generateWinData(vcl::Window* pParent, bool bRequestLegacyContext);
 
 private:
+    SAL_DLLPRIVATE bool InitGLEW();
     SAL_DLLPRIVATE bool initWindow();
     SAL_DLLPRIVATE bool ImplInit();
+#if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID
+    SAL_DLLPRIVATE void initGLWindow(Visual* pVisual);
+#endif
 
 #if defined(MACOSX)
     NSOpenGLView* getOpenGLView();
@@ -197,6 +216,11 @@ private:
     boost::scoped_ptr<SystemChildWindow> m_pChildWindowGC;
     bool mbInitialized;
     bool mbRequestLegacyContext;
+    bool mbUseDoubleBufferedRendering;
+    bool mbRequestVirtualDevice;
+#if defined( UNX ) && !defined MACOSX && !defined IOS && !defined ANDROID
+    bool mbPixmap; // is a pixmap instead of a window
+#endif
 };
 
 #endif
diff --git a/include/vcl/opengl/OpenGLHelper.hxx b/include/vcl/opengl/OpenGLHelper.hxx
index 8c04e320d4be..d49f579a5550 100644
--- a/include/vcl/opengl/OpenGLHelper.hxx
+++ b/include/vcl/opengl/OpenGLHelper.hxx
@@ -16,6 +16,12 @@
 
 #include <rtl/ustring.hxx>
 
+#if defined UNX && !defined MACOSX && !defined IOS && !defined ANDROID
+#  include <prex.h>
+#  include "GL/glxew.h"
+#  include <postx.h>
+#endif
+
 class VCLOPENGL_DLLPUBLIC OpenGLHelper
 {
 public:
@@ -46,6 +52,16 @@ public:
     static float getGLVersion();
 
     static void checkGLError(const char* aFile, size_t nLine);
+
+    /**
+     * checks if the system supports all features that are necessary for the OpenGL VCL support
+     */
+    static bool supportsVCLOpenGL();
+
+#if defined UNX && !defined MACOSX && !defined IOS && !defined ANDROID
+    static bool GetVisualInfo(Display* pDisplay, int nScreen, XVisualInfo& rVI);
+    static GLXFBConfig GetPixmapFBConfig( Display* pDisplay, bool& bInverted );
+#endif
 };
 
 #define CHECK_GL_ERROR() OpenGLHelper::checkGLError(__FILE__, __LINE__)
diff --git a/include/vcl/outdev.hxx b/include/vcl/outdev.hxx
index 6beb928cbe9b..80d8576a8612 100644
--- a/include/vcl/outdev.hxx
+++ b/include/vcl/outdev.hxx
@@ -514,6 +514,8 @@ public:
                                     const Point& rSrcPt,  const Size& rSrcSize,
                                     sal_uInt16 nFlags = 0 );
 
+    virtual bool                SwapBuffers();
+
 protected:
 
     virtual void                CopyDeviceArea( SalTwoRect& aPosAry, sal_uInt32 nFlags);