#XENIA OPENGL 4.3 HOW TO#
Subclassing QScreen lets you control the creation of window surfaces and lets you decide how to implement window compositing.
Subclassing QWindowSurface lets you decide the properties of the space your widgets will draw themselves into, as well as which paint engine they should use to draw themselves into that space. Subclassing QPaintEngine allows you to implement the QPainter API using accelerated hardware. This architecture lets you control the steps of the painting process by subclassing. The server then combines the window surfaces and displays the composition on the screen. The diagram below shows the Qtopia Core painting architecture.Ī client process widget uses a paint engine to draw into a window surface. The Qtopia Core Acceleration Architecture This makes it easy to add 3D effects to applications, for instance when windows are minimized or maximized. The windowing system can be accelerated using OpenGL to implement top level window compositing. Qtopia Core includes a complete windowing system, which implements real transparency. Using OpenGL to Implement Window Compositing and Effects It can also overlay controls and decorations onto 3D scenes drawn using OpenGL. This specialized paint engine can be used to improve 2D rendering performance on appropriate hardware. Qt provides QOpenGLPaintEngine, a subclass of QPaintEngine that translates QPainter operations into OpenGL calls. Using OpenGL to Accelerate Normal 2D Painting To use OpenGL-enabled widgets in a Qtopia Core application, all that is required is to subclass the QGLWidget and draw into instances of the subclass with standard OpenGL functions.
#XENIA OPENGL 4.3 MAC OS#
The module API is cross-platform, so it is also available on Windows, X11, and Mac OS X. The QtOpenGL module offers classes that make it easy to draw 3D graphics in GUI applications.
Qtopia Core's reference integration example demonstrates all three uses.
Because it is meant for use in embedded systems, it has a smaller, more constrained API.įor reference, Trolltech provides a plugin which integrates OpenGL ES with Qtopia Core, but Qtopia Core can be adapted to a wide range of OpenGL versions. OpenGL ES is a subset of the OpenGL standard. It provides a powerful, low-level interface between software and acceleration hardware, and it is operating system and window system independent. OpenGL is an industry standard API for 2D/3D graphics.