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android / platform / external / chromium_org / third_party / angle / d2a67b9
commitd2a67b9621bcbbaf5792f8ea764bdd5b43e3653b[log] [tgz]
authorOlli Etuaho <oetuaho@nvidia.com>Tue Oct 21 16:42:57 2014 +0300
committerJamie Madill <jmadill@chromium.org>Tue Oct 28 15:23:51 2014 +0000
tree2cc8fb7bcce6090ef83e3b9ea2034a11f652d93a
parente2fecdd38ebdd757d7af2fa40a51af4b8cb622f5 [diff]
Fix precision tracking for built-in function return values

Previously, the type of the return value of all function calls was set to
the type of the return value in the function signature. This did not
carry precision information.

This patch changes this so that the return value precision is set
correctly for built-in functions. For single-argument math functions, it
mostly depends on that addUnaryMath sets the type of the return value to
be the same as the type of the operand. The type is replaced but the
precision information from the operand type is retained when needed. For
multi-argument math functions, precision is determined based on all the
nodes in the aggregate after the type has been set. For texture
functions, the precision is set according the sampler type as per ESSL
1.0 spec. For textureSize, the precision is always highp as per ESSL 3.0
spec.

BUG=angle:787

Change-Id: I48448e3ffe38656b91177dee9b60dd07a03cd095
Reviewed-on: https://chromium-review.googlesource.com/224951
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Nicolas Capens <capn@chromium.org>
Tested-by: Olli Etuaho <oetuaho@nvidia.com>
6 files changed
tree: 2cc8fb7bcce6090ef83e3b9ea2034a11f652d93a
  1. build/
  2. extensions/
  3. include/
  4. projects/
  5. samples/
  6. src/
  7. tests/
  8. util/
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD.gn
  13. codereview.settings
  14. CONTRIBUTORS
  15. DEPS
  16. enumerate_files.py
  17. generate_projects
  18. LICENSE
  19. README.chromium
  20. README.md
README.md

#ANGLE The goal of ANGLE is to allow Windows users to seamlessly run WebGL and other OpenGL ES content by translating OpenGL ES API calls to DirectX 9 or DirectX 11 API calls.

ANGLE is a conformant implementation of the OpenGL ES 2.0 specification that is hardware‐accelerated via Direct3D. ANGLE v1.0.772 was certified compliant by passing the ES 2.0.3 conformance tests in October 2011. ANGLE also provides an implementation of the EGL 1.4 specification. Work on ANGLE's OpenGL ES 3.0 implementation is currently in progress, but should not be considered stable.

ANGLE is used as the default WebGL backend for both Google Chrome and Mozilla Firefox on Windows platforms. Chrome uses ANGLE for all graphics rendering on Windows, including the accelerated Canvas2D implementation and the Native Client sandbox environment.

Portions of the ANGLE shader compiler are used as a shader validator and translator by WebGL implementations across multiple platforms. It is used on Mac OS X, Linux, and in mobile variants of the browsers. Having one shader validator helps to ensure that a consistent set of GLSL ES shaders are accepted across browsers and platforms. The shader translator can be used to translate shaders to other shading languages, and to optionally apply shader modifications to work around bugs or quirks in the native graphics drivers. The translator targets Desktop GLSL, Direct3D HLSL, and even ESSL for native GLES2 platforms.

##Building For building instructions, visit the dev setup wiki.

##Contributing