初识OpenGL-ES

OpenGL-ES目标

1. 在OpenGL基础上, 删繁就简
2. 兼容OpenGL
3. 适应嵌入式设备的特点, 如耗电量, Shader性能
4. 确保图像输出质量
5. 确立为开发标准

继承关系

• OpenGL ES 1.0(1.1) - OpenGL 1.3(1.5) - 固定管线
• OpenGL ES 2.0        - OpenGL 2.0       - 可编程管线

版本兼容

    OpenGL ES 2.0不向后兼容OpenGL ES 1.x, 这点和OpenGL 2.0是不同的. 

摘自 <<OpenGL ES 2.0 Programming Guide>>

OpenGL ES 2.0 is not backward compatible with OpenGL ES 1.x. It does not support the fixed function pipeline that OpenGL ES 1.x supports. The OpenGL ES 2.0 programmable vertex shader replaces the fixed function vertex units implemented in OpenGL ES 1.x. Similarly, the programmable fragment shader replaces the fixed function texture combine units implemented in OpenGL ES 1.x. The fixed function texture combine units implement a texture combine stage for each texture unit. This is a departure from OpenGL 2.0, which implements a programmable pipeline but also provides full backward compatibility to older versions of OpenGL that implement a fixed function pipeline.