kc3-lang/angle/doc/ResourceLimits.md

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• Author : Andrew Bonventre
  Date : 2015-09-22 14:14:18
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  Message : [Docs] Add wiki content to Markdown docs Change-Id: I729d3208b206e83f99e73002b45402c4f6f9f443 Reviewed-on: https://chromium-review.googlesource.com/301560 Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• doc/ResourceLimits.md

• # Resource Limits
  
  OpenGL ES 2.0 API is quite powerful but there are still some features that are
  optional or allow for wide variability between implementations.
  
  Applications that need more than the minimum values for these limits should
  query the capabilities of the GL device and scale their usage based on the
  device’s feature set. Failing to do so and assuming sufficient limits typically
  results in reduced portability.
  
  The various implementation dependent limits can be found in Tables 6.18 – 6.20
  of the [OpenGL ES 2.0.25 specification]
  (http://www.khronos.org/registry/gles/specs/2.0/es_full_spec_2.0.25.pdf).
  
  # Capabilities
  
  Capability                                 | ES 2.0 Minimum | ANGLE            | SM2   | SM3      | SM4+
  :----------------------------------------- | :------------- | :--------------- | :---- | :------- | :-------
  GL\_MAX\_VERTEX\_ATTRIBS                   | 8              | 16               |       |          |
  GL\_MAX\_VERTEX\_UNIFORM\_VECTORS          | 128            | 254              |       |          |
  GL\_MAX\_VERTEX\_TEXTURE\_IMAGE\_UNITS     | 0              | (fn1)            | 0     | 0        | 4
  GL\_MAX\_VARYING\_VECTORS                  | 8              | (fn1)            | 8     | 10       | 10
  GL\_MAX\_FRAGMENT\_UNIFORM\_VECTORS        | 16             | (fn1)            | 29    | 221      | 221
  GL\_MAX\_TEXTURE\_IMAGE\_UNITS             | 8              | 16               |       |          |
  GL\_MAX\_TEXTURE\_SIZE                     | 64             | 2048-16384 (fn1) |       |          |
  GL\_MAX\_CUBE\_MAP\_SIZE                   | 16             | 2048-16384 (fn1) |       |          |
  GL\_MAX\_RENDERBUFFER\_SIZE                | 1              | 2048-16384 (fn1) |       |          |
  GL\_ALIASED\_POINT\_SIZE\_RANGE (min, max) | (1, 1)         | (fn2)            | (1,1) | (1, fn2) | (1, fn2)
  GL\_ALIASED\_LINE\_WIDTH\_RANGE (min, max) | (1, 1)         | (1, 1)           |       |          |
  
  ## Notes
  
  *   fn1: limits vary based on the underlying hardware capabilities
  *   fn2: on SM3 or better hardware the max point size is D3DCAPS9.MaxPointSize