change OpenGLDrawable interface

examples/example1/src/example1.d

@@ -974,7 +974,8 @@ static if (ENABLE_OPENGL) {
 
 		bool _oldApi;
 
-		private void doDraw(DrawBuf buf, Rect rc) {
+		/// this is OpenGLDrawableDelegate implementation
+		private void doDraw(Rect windowRect, Rect rc) {
             Log.v("GlGears: MyOpenglWidget.doDraw() draw gears");
             if (!openglEnabled) {
                 Log.v("GlGears: OpenGL is disabled");
@@ -988,6 +989,7 @@ static if (ENABLE_OPENGL) {
 			}
 		}
 
+		/// Legacy API example (glBegin/glEnd)
 		void drawUsingOldAPI(Rect rc) {
 			static bool _initCalled;
             if (!_initCalled) {
@@ -1006,17 +1008,21 @@ static if (ENABLE_OPENGL) {
 			glDisable(GL_LIGHT0);
 			glDisable(GL_DEPTH_TEST);
 		}
+
+		/// New API example (OpenGL3+, shaders)
 		void drawUsingNewAPI(Rect rc) {
+			// TODO: put some sample code here
 		}
 		/// returns true is widget is being animated - need to call animate() and redraw
 		@property override bool animating() { return true; }
 		/// animates window; interval is time left from previous draw, in hnsecs (1/10000000 of second)
 		override void animate(long interval) {
 			if (_oldApi) {
+				// animate legacy API example
 				// rotate gears
 				angle += interval * 0.000002f;
 			} else {
-				// animate new API example
+				// TODO: animate new API example
 			}
 			invalidate();
 		}

src/dlangui/graphics/drawbuf.d

@@ -40,7 +40,7 @@ static if (ENABLE_OPENGL) {
 }
 
 /// Custom draw delegate for OpenGL direct drawing
-alias OpenGLDrawableDelegate = void delegate(DrawBuf buf, Rect rc);
+alias OpenGLDrawableDelegate = void delegate(Rect windowRect, Rect rc);
 
 /// drawing buffer - image container which allows to perform some drawing operations
 class DrawBuf : RefCountedObject {

src/dlangui/graphics/gldrawbuf.d

@@ -91,7 +91,7 @@ class GLDrawBuf : DrawBuf, GLConfigCallback {
 
 	/// draw custom OpenGL scene
 	override void drawCustomOpenGLScene(Rect rc, OpenGLDrawableDelegate handler) {
-		_scene.add(new CustomDrawnSceneItem(this, rc, handler));
+		_scene.add(new CustomDrawnSceneItem(Rect(0, 0, width, height), rc, handler));
 	}
 
     /// fill the whole buffer with solid color (no clipping applied)
@@ -911,13 +911,13 @@ public:
 
 private class CustomDrawnSceneItem : SceneItem {
 private:
-	DrawBuf _buf;
+	Rect _windowRect;
 	Rect _rc;
 	OpenGLDrawableDelegate _handler;
 
 public:
-	this(DrawBuf buf, Rect rc, OpenGLDrawableDelegate handler) {
-		_buf = buf;
+	this(Rect windowRect, Rect rc, OpenGLDrawableDelegate handler) {
+		_windowRect = windowRect;
 		_rc = rc;
 		_handler = handler;
 	}
@@ -925,10 +925,9 @@ public:
 		if (_handler) {
 
 			import derelict.opengl3.gl3 : glViewport;
-			glViewport(_rc.left, _buf.height - _rc.bottom, _rc.width, _rc.height);
-			_handler(_buf, _rc);
-			glSupport.setOrthoProjection(Rect(0, 0, _buf.width, _buf.height));
-
+			glViewport(_rc.left, _windowRect.height - _rc.bottom, _rc.width, _rc.height);
+			_handler(_windowRect, _rc);
+			glSupport.setOrthoProjection(_windowRect);
 		}
 	}
 }

src/dlangui/graphics/resources.d

@@ -252,10 +252,10 @@ class OpenGLDrawable : Drawable {
 		_drawHandler = drawHandler;
 	}
 
-	void onDraw(DrawBuf buf, Rect rc) {
+	void onDraw(Rect windowRect, Rect rc) {
 		// either override this method or assign draw handler
 		if (_drawHandler) {
-			_drawHandler(buf, rc);
+			_drawHandler(windowRect, rc);
 		}
 	}