glsl: Accept language version 100 and make it the default on ES2.

src/glsl/glsl_parser.ypp

@@ -222,6 +222,8 @@ version_statement:
 	| VERSION INTCONSTANT EOL
 	{
 	   switch ($2) {
+	   case 100:
+	      state->es_shader = true;
 	   case 110:
 	   case 120:
 	   case 130:

src/glsl/glsl_parser_extras.cpp

@@ -54,9 +54,17 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct __GLcontextRec *ctx,
 
    /* Set default language version and extensions */
    this->language_version = 110;
+   this->es_shader = false;
    this->ARB_texture_rectangle_enable = true;
 
    if (ctx != NULL) {
+      /* OpenGL ES 2.0 has different defaults from desktop GL. */
+      if (ctx->API == API_OPENGLES2) {
+	 this->language_version = 100;
+	 this->es_shader = true;
+	 this->ARB_texture_rectangle_enable = false;
+      }
+
       this->extensions = &ctx->Extensions;
 
       this->Const.MaxLights = ctx->Const.MaxLights;

src/glsl/glsl_parser_extras.h

@@ -68,6 +68,7 @@ struct _mesa_glsl_parse_state {
    exec_list translation_unit;
    glsl_symbol_table *symbols;
 
+   bool es_shader;
    unsigned language_version;
    enum _mesa_glsl_parser_targets target;