glsl2: Conditionally define preprocessor tokens for optional extensions

The only optional extension currently supported by the compiler is
GL_EXT_texture_array.

src/glsl/glcpp/glcpp-parse.y

@@ -28,6 +28,7 @@
 #include <inttypes.h>
 
 #include "glcpp.h"
+#include "main/mtypes.h"
 
 #define glcpp_print(stream, str) stream = talloc_strdup_append(stream, str)
 #define glcpp_printf(stream, fmt, args...) \
@@ -894,7 +895,7 @@ yyerror (YYLTYPE *locp, glcpp_parser_t *parser, const char *error)
 }
 
 glcpp_parser_t *
-glcpp_parser_create (void)
+glcpp_parser_create (const struct gl_extensions *extensions)
 {
 	glcpp_parser_t *parser;
 	token_t *tok;
@@ -932,6 +933,13 @@ glcpp_parser_create (void)
 	_token_list_append(list, tok);
 	_define_object_macro(parser, NULL, "GL_ARB_texture_rectangle", list);
 
+	if ((extensions != NULL) && extensions->EXT_texture_array) {
+		list = _token_list_create(parser);
+		_token_list_append(list, tok);
+		_define_object_macro(parser, NULL,
+				     "GL_EXT_texture_array", list);
+	}
+
 	talloc_unlink(parser, tok);
 
 	return parser;

src/glsl/glcpp/glcpp.c

@@ -68,16 +68,13 @@ load_text_file(void *ctx, const char *file_name)
 	return text;
 }
 
-int
-preprocess(void *talloc_ctx, const char **shader, char **info_log);
-
 int
 main (void)
 {
 	void *ctx = talloc(NULL, void*);
 	const char *shader = load_text_file(ctx, NULL);
 	char *info_log = talloc_strdup(ctx, "");
-	int ret = preprocess(ctx, &shader, &info_log);
+	int ret = preprocess(ctx, &shader, &info_log, NULL);
 
 	printf("%s", shader);
 	fprintf(stderr, "%s", info_log);

src/glsl/glcpp/glcpp.h

@@ -158,8 +158,10 @@ struct glcpp_parser {
 	int error;
 };
 
+struct gl_extensions;
+
 glcpp_parser_t *
-glcpp_parser_create (void);
+glcpp_parser_create (const struct gl_extensions *extensions);
 
 int
 glcpp_parser_parse (glcpp_parser_t *parser);
@@ -168,7 +170,8 @@ void
 glcpp_parser_destroy (glcpp_parser_t *parser);
 
 int
-preprocess(void *talloc_ctx, const char **shader, char **info_log);
+preprocess(void *talloc_ctx, const char **shader, char **info_log,
+	   const struct gl_extensions *extensions);
 
 /* Functions for writing to the info log */
 

src/glsl/glcpp/pp.c

@@ -134,10 +134,11 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader)
 }
 
 extern int
-preprocess(void *talloc_ctx, const char **shader, char **info_log)
+preprocess(void *talloc_ctx, const char **shader, char **info_log,
+	   const struct gl_extensions *extensions)
 {
 	int errors;
-	glcpp_parser_t *parser = glcpp_parser_create ();
+	glcpp_parser_t *parser = glcpp_parser_create (extensions);
 	*shader = remove_line_continuations(parser, *shader);
 
 	glcpp_lex_set_source_string (parser, *shader);