several of the more technical drawing modes are eliminated, including frontbuffer and accumulation buffer.bitmap operations for copying pixels individually, evaluators, and user selection operations are not allowed.display lists and feedback are removed, as are push and pop operations for state attributes.and some material parameters were removed, including back-face parameters and user-defined clip planes.OpenGL ES Extension #10 (became core in ES 2.0) OpenGL ES 1.1 added features such as mandatory support for multitexture, better multitexture support (including combiners and dot product texture operations), automatic mipmap generation, vertex buffer objects, state queries, user clip planes, and greater control over point rendering. OpenGL ES 2.0 was publicly released in March 2007. It is roughly based on OpenGL 2.0, but it eliminates most of the fixed-function rendering pipeline in favor of a programmable one in a move similar to the transition from OpenGL 3.0 to 3.1. Control flow in shaders is generally limited to forward branching and to loops where the maximum number of iterations can easily be determined at compile time. Almost all rendering features of the transform and lighting stage, such as the specification of materials and light parameters formerly specified by the fixed-function API, are replaced by shaders written by the graphics programmer. As a result, OpenGL ES 2.0 is not backward compatible with OpenGL ES 1.1. Some incompatibilities between the desktop version of OpenGL and OpenGL ES 2.0 persisted until OpenGL 4.1, which added the GL_ARB_ES2_compatibility extension. OpenGL ES Extension #71 (became core in ES 3.0) OpenGL ES Extension #36, extended in ES 3.0 and 3.1 OpenGL ES Extension #35, extended in ES 3.0 and 3.1 OES_texture_float_linear OES_texture_half_float_linear OpenGL ES Extension #34 (became core in ES 3.0) OpenGL ES Extension #87 (different for 1.1) OpenGL ES Extension #23 (different for 1.1) The Khronos Group has written a document describing the differences between OpenGL ES 2.0 and ordinary OpenGL 2.0.
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