If a shader contains a declaration such as:
uniform sampler2DMS tex;
but it doesn't specify "#extension GL_ARB_texture_multisample: enable"
we get a GLSL error saying something like "0:2(21): error: syntax error,
unexpected NEW_IDENTIFIER, expecting '{'"
There are other cases where the error "unexpected NEW_IDENTIFIER" pops
up. In my experience it's often somewhere deep down inside a large shader.
In this example, it would be nice if the compiler said "unexpected
sampler2DMS identifier" instead of "unexpected NEW_IDENTIFIER".
The error message comes directly from bison via the yyerror() function
and I don't see an obvious way to get at the "sampler2DMS" string here.
The YYLTYPE passed to yyerror() has useful info such as the identifier's
line and location within the line:
(gdb) p *loc
$1 = {first_line = 10, first_column = 21, last_line = 10, last_column =
25, source = 0}
but I don't see a way to get the actual string from the lexer.
Anyone have some ideas? Fixing this would be a nice time saver for me
when I'm investigating application shader issues.
-Brian
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