kc3-lang/angle

2015-08-14T14:16:19

Add full support for line continuation in the preprocessor Line continuation in ESSL 3.00 needs to be processed before tokenization, since tokens can span the line continuation. On the other hand, ANGLE's tokenizer keeps track of line numbers, and whenever a line continuation appears the line number still needs to be incremented by one, just like on a regular newline. That's why line continuation is now implemented as follows: when the shader strings are concatenated in Input, they are also checked for line continuation. Whenever line continuation is encountered, the string is cut before that point. When the tokenizer asks for more input, the string starting from the character after line continuation is passed to it, and the line number is incremented from Input. This way the tokenizer can parse tokens that span multiple lines - it never sees the line continuation - but still keeps track of the line number correctly. Relevant spec is in ESSL 3.00 section 3.2 "Source strings". Support for line continuation also applies to ESSL 1.00. ESSL 3.00 spec section 1.5 says that line continuation support is mandated when an ESSL 1.00 shader is used with the OpenGL ES 3.0 API, and is optional when ESSL 1.00 is used with the OpenGL ES 2.0 API. TEST=dEQP-GLES3.functional.shaders.preprocessor.line_continuation.* (all pass), angle_unittests BUG=angleproject:1125 Change-Id: I1c1de49602e7cd755d6072c3c0aa5524cd0313b4 Reviewed-on: https://chromium-review.googlesource.com/293721 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Olli Etuaho <oetuaho@nvidia.com>