glcpp: Resolve implicit GLSL version to 100 if the API is ES.

Fixes a regression since b2d1c579 where ES shaders without a #version
declaration would fail to compile if their precision declaration was
wrapped in the standard #ifdef GL_ES check.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74066
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

4 files changed, 16 insertions, 5 deletions

diff --git a/src/glsl/glcpp/glcpp-parse.y b/src/glsl/glcpp/glcpp-parse.y
index 2084c44..17bc649 100644
--- a/src/glsl/glcpp/glcpp-parse.y
+++ b/src/glsl/glcpp/glcpp-parse.y
@@ -30,6 +30,7 @@
 
 #include "glcpp.h"
 #include "main/core.h" /* for struct gl_extensions */
+#include "main/mtypes.h" /* for gl_api enum */
 
 static void
 yyerror (YYLTYPE *locp, glcpp_parser_t *parser, const char *error);
@@ -1186,7 +1187,7 @@ static void add_builtin_define(glcpp_parser_t *parser,
 }
 
 glcpp_parser_t *
-glcpp_parser_create (const struct gl_extensions *extensions)
+glcpp_parser_create (const struct gl_extensions *extensions, gl_api api)
 {
 	glcpp_parser_t *parser;
 
@@ -1215,6 +1216,7 @@ glcpp_parser_create (const struct gl_extensions *extensions)
 	parser->error = 0;
 
         parser->extensions = extensions;
+        parser->api = api;
         parser->version_resolved = false;
 
 	parser->has_new_line_number = 0;
@@ -2142,12 +2144,19 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t *parser, intmax_t versio
 	}
 }
 
-/* GLSL version is no version is explicitly specified. */
+/* GLSL version if no version is explicitly specified. */
 #define IMPLICIT_GLSL_VERSION 110
 
+/* GLSL ES version if no version is explicitly specified. */
+#define IMPLICIT_GLSL_ES_VERSION 100
+
 void
 glcpp_parser_resolve_implicit_version(glcpp_parser_t *parser)
 {
-	_glcpp_parser_handle_version_declaration(parser, IMPLICIT_GLSL_VERSION,
+	int language_version = parser->api == API_OPENGLES2 ?
+			       IMPLICIT_GLSL_ES_VERSION :
+			       IMPLICIT_GLSL_VERSION;
+
+	_glcpp_parser_handle_version_declaration(parser, language_version,
 						 NULL, false);
 }
diff --git a/src/glsl/glcpp/glcpp.c b/src/glsl/glcpp/glcpp.c
index c9c2ff2..6994d7b 100644
--- a/src/glsl/glcpp/glcpp.c
+++ b/src/glsl/glcpp/glcpp.c
@@ -101,6 +101,7 @@ load_text_file(void *ctx, const char *filename)
 static void
 init_fake_gl_context (struct gl_context *gl_ctx)
 {
+	gl_ctx->API = API_OPENGL_COMPAT;
 	gl_ctx->Const.DisableGLSLLineContinuations = false;
 }
 
diff --git a/src/glsl/glcpp/glcpp.h b/src/glsl/glcpp/glcpp.h
index 9d85c16..79ccb23 100644
--- a/src/glsl/glcpp/glcpp.h
+++ b/src/glsl/glcpp/glcpp.h
@@ -183,6 +183,7 @@ struct glcpp_parser {
 	size_t info_log_length;
 	int error;
 	const struct gl_extensions *extensions;
+	gl_api api;
 	bool version_resolved;
 	bool has_new_line_number;
 	int new_line_number;
@@ -194,7 +195,7 @@ struct glcpp_parser {
 struct gl_extensions;
 
 glcpp_parser_t *
-glcpp_parser_create (const struct gl_extensions *extensions);
+glcpp_parser_create (const struct gl_extensions *extensions, gl_api api);
 
 int
 glcpp_parser_parse (glcpp_parser_t *parser);
diff --git a/src/glsl/glcpp/pp.c b/src/glsl/glcpp/pp.c
index fc645f7..4a623f8 100644
--- a/src/glsl/glcpp/pp.c
+++ b/src/glsl/glcpp/pp.c
@@ -139,7 +139,7 @@ glcpp_preprocess(void *ralloc_ctx, const char **shader, char **info_log,
 	   const struct gl_extensions *extensions, struct gl_context *gl_ctx)
 {
 	int errors;
-	glcpp_parser_t *parser = glcpp_parser_create (extensions);
+	glcpp_parser_t *parser = glcpp_parser_create (extensions, gl_ctx->API);
 
 	if (! gl_ctx->Const.DisableGLSLLineContinuations)
 		*shader = remove_line_continuations(parser, *shader);