![]() ![]() To translate QPainter operations into OpenGL ES calls (there are actually two subclasses, one for OpenGL/ES 1.1 and another for OpenGL/ES 2.0), Qt uses a subclass of QPaintEngine. However, Qt for Embedded can be adapted to a wide range of OpenGL versions. Qt provides a plugin that integrates both OpenGL ES versions 1.x and 2.x with Qt for Embedded. The QtOpenGL module offers classes that make it easy to draw 3D graphics in GUI applications using OpenGL ES. Instead of using the pre-defined functions, the programmer writes small shader programs telling the hardware in detail how to render each object. ![]() ![]() Instead of using function transformation and a fragment pipeline, 2.x uses the OpenGL ES Shading Language (GLSL ES). OpenGL 2.x has a significantly shorter graphics pipeline than 1.x. ![]() OpenGL ES 1.x limits processing to a pre-defined set of fixed options for drawing and lighting objects. It is worth noting that there is a significant difference between the two, and that they are not compatible with each other. OpenGL ES version 1.x is designed for fixed function hardware, while its successor OpenGL ES version 2.x is designed for programmable hardware. Because it is designed for use with embedded systems, it has a smaller, more constrained API. 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. ![]()
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