glsl: glcpp: Move handling of #line directives from lexer to parser.

The GLSL specification requires that #line directives be interpreted
after macro expansion. Our existing implementation of #line macros in
the lexer prevents conformance on this point.

Moving the handling of #line from the lexer to the parser gives us the
macro expansion we need. An additional benefit is that the
preprocessor also now supports comments on the same line as #line
directives.

Finally, the preprocessor now emits the (fully-macro-expanded) #line
directives into the output. This allows the full GLSL compiler to also
see and interpret these directives so it can also generate correct
line numbers in error messages.

Signed-off-by: Carl Worth <cworth@cworth.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/glsl/glcpp/glcpp.h

@@ -25,6 +25,7 @@
 #define GLCPP_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "../ralloc.h"
 
@@ -177,6 +178,10 @@ struct glcpp_parser {
 	size_t output_length;
 	size_t info_log_length;
 	int error;
+	bool has_new_line_number;
+	int new_line_number;
+	bool has_new_source_number;
+	int new_source_number;
 };
 
 struct gl_extensions;