OpenGL multiple canvas support

Engine/source/gfx/gl/gfxGLWindowTarget.cpp

@@ -37,7 +37,7 @@ GFX_ImplementTextureProfile( BackBufferDepthProfile,
 
 GFXGLWindowTarget::GFXGLWindowTarget(PlatformWindow *win, GFXDevice *d)
       : GFXWindowTarget(win), mDevice(d), mContext(NULL), mFullscreenContext(NULL)
-      , mCopyFBO(0), mBackBufferFBO(0)
+      , mCopyFBO(0), mBackBufferFBO(0), mSecondaryWindow(false)
 {      
    win->appEvent.notify(this, &GFXGLWindowTarget::_onAppSignal);
 }
@@ -52,7 +52,14 @@ GFXGLWindowTarget::~GFXGLWindowTarget()
 
 void GFXGLWindowTarget::resetMode()
 {
-   if(mWindow->getVideoMode().fullScreen != mWindow->isFullscreen())
+   // Do some validation...
+   bool fullscreen = mWindow->getVideoMode().fullScreen;
+   if (fullscreen && mSecondaryWindow)
+   {
+      AssertFatal(false, "GFXGLWindowTarget::resetMode - Cannot go fullscreen with secondary window!");
+   }
+
+   if(fullscreen != mWindow->isFullscreen())
    {
       _teardownCurrentMode();
       _setupNewMode();

Engine/source/gfx/gl/gfxGLWindowTarget.h

@@ -50,6 +50,9 @@ public:
    virtual void resolveTo(GFXTextureObject* obj);
    
    void _onAppSignal(WindowId wnd, S32 event);
+
+   // create pixel format for the window
+   void createPixelFormat();
    
 private:
    friend class GFXGLDevice;
@@ -58,6 +61,8 @@ private:
    GFXTexHandle mBackBufferColorTex, mBackBufferDepthTex;
    Point2I size;   
    GFXDevice* mDevice;
+   /// Is this a secondary window
+   bool mSecondaryWindow;
    void* mContext;
    void* mFullscreenContext;
    void _teardownCurrentMode();
@@ -66,6 +71,7 @@ private:
    void _WindowPresent();
    //set this windows context to be current
    void _makeContextCurrent();
+   
 };
 
 #endif

Engine/source/gfx/gl/sdl/gfxGLDevice.sdl.cpp

@@ -191,19 +191,21 @@ U32 GFXGLDevice::getTotalVideoMemory()
 
 GFXWindowTarget *GFXGLDevice::allocWindowTarget( PlatformWindow *window )
 {
-    AssertFatal(!mContext, "This GFXGLDevice is already assigned to a window");
+   GFXGLWindowTarget* ggwt = new GFXGLWindowTarget(window, this);
-    
-    GFXGLWindowTarget* ggwt = 0;
-    if( !mContext )
-    {
-        // no context, init the device now
-        init(window->getVideoMode(), window);
-        ggwt = new GFXGLWindowTarget(window, this);
-        ggwt->registerResourceWithDevice(this);
-        ggwt->mContext = mContext;
-    }
 
-    return ggwt;
+   //first window
+   if (!mContext)
+   {
+      init(window->getVideoMode(), window);
+      ggwt->mSecondaryWindow = false;
+   }
+   else
+      ggwt->mSecondaryWindow = true;
+
+   ggwt->registerResourceWithDevice(this);
+   ggwt->mContext = mContext;
+
+   return ggwt;
 }
 
 GFXFence* GFXGLDevice::_createPlatformSpecificFence()

Engine/source/gfx/gl/win32/gfxGLDevice.win.cpp

@@ -255,14 +255,6 @@ void GFXGLDevice::init( const GFXVideoMode &mode, PlatformWindow *window )
    HDC hdcGL = GetDC( hwnd );
    AssertFatal( hdcGL != NULL, "Failed to create device context" );
 
-   // Create pixel format descriptor...
-   PIXELFORMATDESCRIPTOR pfd;
-   CreatePixelFormat( &pfd, 32, 0, 0, false ); // 32 bit color... We do not need depth or stencil, OpenGL renders into a FBO and then copy the image to window
-   if( !SetPixelFormat( hdcGL, ChoosePixelFormat( hdcGL, &pfd ), &pfd ) )
-   {
-      AssertFatal( false, "GFXGLDevice::init - cannot get the one and only pixel format we check for." );
-   }
-
    int OGL_MAJOR = 3;
    int OGL_MINOR = 2;
    
@@ -330,13 +322,21 @@ U32 GFXGLDevice::getTotalVideoMemory()
 
 //------------------------------------------------------------------------------
 
-GFXWindowTarget *GFXGLDevice::allocWindowTarget( PlatformWindow *window )
+GFXWindowTarget *GFXGLDevice::allocWindowTarget(PlatformWindow *window)
 {
-   AssertFatal(!mContext, "");
-   
-   init(window->getVideoMode(), window);
    GFXGLWindowTarget *ggwt = new GFXGLWindowTarget(window, this);
    ggwt->registerResourceWithDevice(this);
+   ggwt->createPixelFormat();
+
+   //first window
+   if (!mContext)
+   {
+      init(window->getVideoMode(), window);
+      ggwt->mSecondaryWindow = false;
+   }
+   else
+      ggwt->mSecondaryWindow = true;
+
    ggwt->mContext = mContext;
    AssertFatal(ggwt->mContext, "GFXGLDevice::allocWindowTarget - failed to allocate window target!");
 
@@ -364,15 +364,32 @@ void GFXGLWindowTarget::_setupNewMode()
 {
 }
 
+void GFXGLWindowTarget::createPixelFormat()
+{
+   HWND hwnd = GETHWND(mWindow);
+   // Create a device context
+   HDC hdcGL = GetDC(hwnd);
+   AssertFatal(hdcGL != NULL, "GFXGLWindowTarget::createPixelFormat() - Failed to create device context");
+
+   // Create pixel format descriptor...
+   PIXELFORMATDESCRIPTOR pfd;
+   CreatePixelFormat(&pfd, 32, 0, 0, false); // 32 bit color... We do not need depth or stencil, OpenGL renders into a FBO and then copy the image to window
+   if (!SetPixelFormat(hdcGL, ChoosePixelFormat(hdcGL, &pfd), &pfd))
+   {
+      AssertFatal(false, "GFXGLWindowTarget::createPixelFormat() - cannot get the one and only pixel format we check for.");
+   }
+}
+
 void GFXGLWindowTarget::_makeContextCurrent()
 {
    HWND hwnd = GETHWND(getWindow());
    HDC hdc = GetDC(hwnd);
+
    if (!wglMakeCurrent(hdc, (HGLRC)mContext))
    {
       //HRESULT if needed for debug
       //HRESULT hr = HRESULT_FROM_WIN32(GetLastError());
       AssertFatal(false, "GFXGLWindowTarget::_makeContextCurrent() - cannot make our context current.");
    }
-   
+
-}
+}