fix #168 - share OpenGL context between windows under Win32/OpenGL

examples/d3d/src/d3d.d

@@ -102,7 +102,10 @@ extern (C) int UIAppMain(string[] args) {
     cam.translation = vec3(0, 0, -5);
     scene.activeCamera = cam;
     mat4 camMatrix = scene.viewProjectionMatrix;
-    MeshPart part = new MeshPart();
+    VertexFormat vfmt = VertexFormat(VertexElementType.POSITION, VertexElementType.COLOR, VertexElementType.TEXCOORD0);
+    Mesh2 mesh = new Mesh2(vfmt);
+    mesh.addVertex([1,2,3, 1,1,1,1, 0,0]);
+    //MeshPart part = new MeshPart();
 
     // show window
     window.show();

src/dlangui/dialogs/filedlg.d

@@ -86,7 +86,11 @@ struct FileFilterEntry {
 }
 
 version (Windows) {
-    __gshared bool SHOW_FILE_DIALOG_IN_POPUP = true;
+    static if (BACKEND_SDL) {
+        __gshared bool SHOW_FILE_DIALOG_IN_POPUP = false;
+    } else {
+        __gshared bool SHOW_FILE_DIALOG_IN_POPUP = false;
+    }
 } else {
     __gshared bool SHOW_FILE_DIALOG_IN_POPUP = false;
 }

src/dlangui/graphics/scene/mesh.d

@@ -22,7 +22,21 @@ struct VertexElement {
     private ubyte _size;
     @property VertexElementType type() const { return _type; }
     @property ubyte size() const { return _size; }
-    this(VertexElementType type, ubyte size) {
+    this(VertexElementType type, ubyte size = 0) {
+        if (size == 0) {
+            switch(type) with (VertexElementType) {
+                case POSITION:
+                case NORMAL:
+                    size = 3;
+                    break;
+                case COLOR:
+                    size = 4;
+                    break;
+                default:
+                    size = 2;
+                    break;
+            }
+        }
         _type = type;
         _size = size;
     }
@@ -38,6 +52,14 @@ struct VertexFormat {
         foreach(elem; elems)
             _vertexSize += elem.size * float.sizeof;
     }
+    /// init from vertex element types, using default sizes for types
+    this(inout VertexElementType[] types...) {
+        foreach(t; types) {
+            VertexElement elem = VertexElement(t);
+            _elements ~= elem;
+            _vertexSize += elem.size;
+        }
+    }
     /// get number of elements
     @property int length() const {
         return cast(int)_elements.length;
@@ -46,10 +68,24 @@ struct VertexFormat {
     VertexElement opIndex(int index) const {
         return _elements[index];
     }
-    /// returns vertex size in bytes for format
+    /// returns vertex size in bytes
     @property int vertexSize() const {
+        return _vertexSize * float.sizeof;
+    }
+    /// returns vertex size in floats
+    @property int vertexFloats() const {
         return _vertexSize;
     }
+    /// returns true if it's valid vertex format
+    @property bool isValid() const {
+        if (!_vertexSize)
+            return false;
+        foreach(elem; _elements) {
+            if (elem.type == VertexElementType.POSITION)
+                return true;
+        }
+        return false;
+    }
     /// compare
     bool opEquals(immutable ref VertexFormat fmt) {
         if (_vertexSize != fmt._vertexSize)
@@ -61,6 +97,46 @@ struct VertexFormat {
     }
 }
 
+class Mesh2 {
+    protected VertexFormat _vertexFormat;
+    protected int _vertexCount;
+    protected float[] _vertexData;
+
+    @property ref const(VertexFormat) vertexFormat() const { return _vertexFormat; }
+    @property void vertexFormat(VertexFormat format) { 
+        assert(_vertexCount == 0);
+        _vertexFormat = format; 
+    }
+    @property int vertexCount() const { return _vertexCount; }
+
+    /// adds single vertex
+    int addVertex(float[] data) {
+        assert(_vertexFormat.isValid && data.length == _vertexFormat.vertexFloats);
+        int res = _vertexCount;
+        _vertexData.assumeSafeAppend();
+        _vertexData ~= data;
+        _vertexCount++;
+        return res;
+    }
+
+    /// adds one or more vertexes
+    int addVertexes(float[] data) {
+        assert(_vertexFormat.isValid && (data.length > 0) && (data.length % _vertexFormat.vertexFloats == 0));
+        int res = _vertexCount;
+        _vertexData.assumeSafeAppend();
+        _vertexData ~= data;
+        _vertexCount += cast(int)(data.length / _vertexFormat.vertexFloats);
+        return res;
+    }
+
+    this() {
+    }
+
+    this(VertexFormat vertexFormat) {
+        _vertexFormat = vertexFormat;
+    }
+}
+
 class Mesh {
     protected MeshPart[] _parts;
     protected int _vertexCount;

src/dlangui/platforms/windows/winapp.d

@@ -156,6 +156,69 @@ static if (ENABLE_OPENGL) {
 
 const uint CUSTOM_MESSAGE_ID = WM_USER + 1;
 
+static if (ENABLE_OPENGL) {
+
+    /// Shared opengl context helper
+    struct SharedGLContext {
+        import derelict.opengl3.wgl;
+
+        HGLRC _hGLRC; // opengl context
+        HPALETTE _hPalette;
+        bool _error;
+        /// Init OpenGL context, if not yet initialized
+        bool init(HDC hDC) {
+            if (_hGLRC)
+                return true;
+            if (_error)
+                return false;
+            if (setupPixelFormat(hDC)) {
+                _hPalette = setupPalette(hDC);
+                _hGLRC = wglCreateContext(hDC);
+                if (_hGLRC) {
+                    bind(hDC);
+                    bool initialized = initGLSupport(false);
+                    unbind(hDC);
+                    if (!initialized) {
+                        uninit();
+                        Log.e("Failed to init OpenGL shaders");
+                        _error = true;
+                        return false;
+                    }
+                    return true;
+                } else {
+                    _error = true;
+                    return false;
+                }
+            } else {
+                Log.e("Cannot setup pixel format");
+                _error = true;
+                return false;
+            }
+        }
+        void uninit() {
+            if (_hGLRC) {
+                wglDeleteContext(_hGLRC);
+                _hGLRC = null;
+            }
+        }
+        /// make this context current for DC
+        void bind(HDC hDC) {
+            wglMakeCurrent(hDC, _hGLRC);
+        }
+        /// make null context current for DC
+        void unbind(HDC hDC) {
+            wglMakeCurrent(hDC, null);
+        }
+        void swapBuffers(HDC hDC) {
+            SwapBuffers(hDC);
+        }
+    }
+
+    /// OpenGL context to share between windows
+    __gshared SharedGLContext sharedGLContext;
+}
+
+
 class Win32Window : Window {
     Win32Platform _platform;
 
@@ -200,25 +263,11 @@ class Win32Window : Window {
                             _hInstance,           // program instance handle
                             cast(void*)this);                // creation parameters
         static if (ENABLE_OPENGL) {
-            import derelict.opengl3.wgl;
-
             /* initialize OpenGL rendering */
             HDC hDC = GetDC(_hwnd);
 
             if (openglEnabled || !_glSupport) {
-                if (setupPixelFormat(hDC)) {
-                    _hPalette = setupPalette(hDC);
-                    _hGLRC = wglCreateContext(hDC);
-                    if (_hGLRC) {
-                        wglMakeCurrent(hDC, _hGLRC);
-                        useOpengl = initGLSupport(false);
-                        wglMakeCurrent(hDC, null);
-                    }
-                } else {
-                    Log.e("Pixelformat failed");
-                    // disable GL
-                    useOpengl = false;
-                }
+                useOpengl = sharedGLContext.init(hDC);
             }
         }
     }
@@ -239,7 +288,7 @@ class Win32Window : Window {
             //HDC hdc = BeginPaint(_hwnd, &ps);
             //scope(exit) EndPaint(_hwnd, &ps);
             HDC hdc = GetDC(_hwnd);
-            wglMakeCurrent(hdc, _hGLRC);
+            sharedGLContext.bind(hdc);
             //_glSupport = _gl;
             glDisable(GL_DEPTH_TEST);
             glViewport(0, 0, _dx, _dy);
@@ -267,14 +316,15 @@ class Win32Window : Window {
                 onDraw(buf);
             }
             buf.afterDrawing();
-            SwapBuffers(hdc);
-            wglMakeCurrent(hdc, null);
+            sharedGLContext.swapBuffers(hdc);
+            sharedGLContext.unbind(hdc);
             destroy(buf);
         }
     }
 
     ~this() {
         debug Log.d("Window destructor");
+        /*
         static if (ENABLE_OPENGL) {
             import derelict.opengl3.wgl;
             if (_hGLRC) {
@@ -287,6 +337,7 @@ class Win32Window : Window {
                 _hGLRC = null;
             }
         }
+        */
         if (_hwnd)
             DestroyWindow(_hwnd);
         _hwnd = null;