Previously only lower precisions were supported, which are easier to compute (it takes less hardware and less memory), but as shader complexity increases the relatively large precision errors become even larger. full precision) data types and operations. The primary addition for GLSL ES 3.0 is full support for 32bit integer and 32bit floating point (i.e. OpenGL ES 3.0 also adds support for Uniform Buffer Objects, which is a useful and efficient data buffer type for use with shaders.Īs is common with most OpenGL releases, OpenGL ES 3.0 includes a new version of the GL ES Shading Langauge, used to program shader effects. OpenGL ES 2.0’s buffer format specification had some ambiguity, which lead to GPU vendors sometimes implementing the same buffer format in slightly different ways, which in turn could lead to problems for developers. The first major addition to OpenGL ES 3.0 is support for a number of buffer formats, alongside a general tightening up of the buffer format specifications.
Strictly Defined Pixel/Uniform/Frame Buffer Objects If you only implement the baseline OpenGL ES 3.0 feature set, then it won’t be enough for D3D 10_0 compliance. Consequently, this is why some mobile GPUs like Adreno 320 can support OpenGL ES 3.0, but not D3D feature level 10_0. So if we had to place OpenGL ES 3.0 along a Direct3D continuum, as it’s primarily based on OpenGL 3.1, it would be somewhere between Direct3D feature level 9_3 and feature level 10_0, again primarily due to a lack of geometry shaders. From a major feature perspective OpenGL did not reach parity with Direct3D 10 until OpenGL 3.2, which among other things introduced geometry shader support.
Direct3D of course had a major reachitecting with Direct3D 10 back in 2007, which added a number of features to the API while giving Microsoft a chance to clean out a great deal of fixed-function legacy cruft. On that note, though drawing a comparison to Direct3D isn’t particularly straightforward, since we get asked about it so much we’ll try to answer it. In terms of backwards compatibility only OpenGL 4.3 is a complete superset of OpenGL ES 3.0, but for most purposes OpenGL 3.1 is probably the closest desktop OpenGL specification. In terms of functionality, OpenGL ES 3.0 is largely a mobile implementation of the OpenGL 3.3 feature set, with a couple notable features missing and a few additional features plucked from later revisions of OpenGL. In conjunction with next-generation GPUs, OpenGL ES 3.0 will make a number of new features available to mobile and embedded devices.
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