From e483cb9a3add01dc552bd2a42763aff4be5808fc Mon Sep 17 00:00:00 2001
From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Sun, 12 Jun 2016 18:56:43 -0400
Subject: [PATCH] glsl: reuse main extension table to appropriately restrict
 extensions

Previously we were only restricting based on ES/non-ES-ness and whether
the overall enable bit had been flipped on. However we have been adding
more fine-grained restrictions, such as based on compat profiles, as
well as specific ES versions. Most of the time this doesn't matter, but
it can create awkward situations and duplication of logic.

Here we separate the main extension table into a separate object file,
linked to the glsl compiler, which makes use of it with a custom
function which takes the ES-ness of the shader into account (thus
allowing desktop shaders to properly use ES extensions that would
otherwise have been disallowed.) We can also now use this logic to
generate #define's for all supported extensions automatically, removing
the duplicate (and often inaccurate) list in glcpp.

The effect of this change should be nil in most cases. However in some
situations, extensions like GL_ARB_gpu_shader5 which were formerly
available in compat contexts on the GLSL side of things will now become
inaccessible.

This regresses two ES CTS tests:

  ES3-CTS.shaders.shader_integer_mix.define
  ES31-CTS.shader_integer_mix.define

however that is due to them using #version 100 instead of 300 es. As the
extension is only defined for ES3, I believe this is the correct
behavior.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com> (v2)
v2 -> v3: integrate glcpp defines into the same mechanism
---
 src/Makefile.am                          |   1 +
 src/compiler/SConscript.glsl             |   2 +
 src/compiler/glsl/glcpp/glcpp-parse.y    | 204 +---------------
 src/compiler/glsl/glcpp/glcpp.c          |   2 +-
 src/compiler/glsl/glcpp/glcpp.h          |  19 +-
 src/compiler/glsl/glcpp/pp.c             |   6 +-
 src/compiler/glsl/glsl_parser_extras.cpp | 281 +++++++++++++----------
 src/compiler/glsl/glsl_parser_extras.h   |  17 +-
 src/compiler/glsl/test_optpass.cpp       |   2 +-
 src/mesa/Android.libmesa_glsl_utils.mk   |   2 +
 src/mesa/Makefile.sources                |   1 +
 src/mesa/main/extensions.c               |  33 +--
 src/mesa/main/extensions.h               |   1 +
 src/mesa/main/extensions_table.c         |  51 ++++
 14 files changed, 268 insertions(+), 354 deletions(-)
 create mode 100644 src/mesa/main/extensions_table.c

diff --git a/src/Makefile.am b/src/Makefile.am
index b130f5b7ced..d4e34b47bee 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -107,6 +107,7 @@ AM_CPPFLAGS = \
 noinst_LTLIBRARIES = libglsl_util.la
 
 libglsl_util_la_SOURCES = \
+	mesa/main/extensions_table.c \
 	mesa/main/imports.c \
 	mesa/program/prog_hash_table.c \
 	mesa/program/symbol_table.c \
diff --git a/src/compiler/SConscript.glsl b/src/compiler/SConscript.glsl
index 4252ce15771..31d8f6debf4 100644
--- a/src/compiler/SConscript.glsl
+++ b/src/compiler/SConscript.glsl
@@ -70,6 +70,7 @@ if env['msvc']:
 # Copy these files to avoid generation object files into src/mesa/program
 env.Prepend(CPPPATH = ['#src/mesa/main'])
 env.Command('glsl/imports.c', '#src/mesa/main/imports.c', Copy('$TARGET', '$SOURCE'))
+env.Command('glsl/extensions_table.c', '#src/mesa/main/extensions_table.c', Copy('$TARGET', '$SOURCE'))
 # Copy these files to avoid generation object files into src/mesa/program
 env.Prepend(CPPPATH = ['#src/mesa/program'])
 env.Command('glsl/prog_hash_table.c', '#src/mesa/program/prog_hash_table.c', Copy('$TARGET', '$SOURCE'))
@@ -79,6 +80,7 @@ env.Command('glsl/dummy_errors.c', '#src/mesa/program/dummy_errors.c', Copy('$TA
 compiler_objs = env.StaticObject(source_lists['GLSL_COMPILER_CXX_FILES'])
 
 mesa_objs = env.StaticObject([
+    'glsl/extensions_table.c',
     'glsl/imports.c',
     'glsl/prog_hash_table.c',
     'glsl/symbol_table.c',
diff --git a/src/compiler/glsl/glcpp/glcpp-parse.y b/src/compiler/glsl/glcpp/glcpp-parse.y
index a1597611144..ca376d983ff 100644
--- a/src/compiler/glsl/glcpp/glcpp-parse.y
+++ b/src/compiler/glsl/glcpp/glcpp-parse.y
@@ -1311,7 +1311,7 @@ add_builtin_define(glcpp_parser_t *parser, const char *name, int value)
 }
 
 glcpp_parser_t *
-glcpp_parser_create(const struct gl_extensions *extensions, gl_api api)
+glcpp_parser_create(glcpp_extension_iterator extensions, void *state, gl_api api)
 {
    glcpp_parser_t *parser;
 
@@ -1344,6 +1344,7 @@ glcpp_parser_create(const struct gl_extensions *extensions, gl_api api)
    parser->error = 0;
 
    parser->extensions = extensions;
+   parser->state = state;
    parser->api = api;
    parser->version_resolved = false;
 
@@ -2279,8 +2280,6 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t *parser, intmax_t versio
                                          const char *es_identifier,
                                          bool explicitly_set)
 {
-   const struct gl_extensions *extensions = parser->extensions;
-
    if (parser->version_resolved)
       return;
 
@@ -2292,199 +2291,9 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t *parser, intmax_t versio
                      (es_identifier && (strcmp(es_identifier, "es") == 0));
 
    /* Add pre-defined macros. */
-   if (parser->is_gles) {
+   if (parser->is_gles)
       add_builtin_define(parser, "GL_ES", 1);
-      add_builtin_define(parser, "GL_EXT_separate_shader_objects", 1);
-      add_builtin_define(parser, "GL_EXT_draw_buffers", 1);
-
-      if (extensions != NULL) {
-         if (extensions->OES_EGL_image_external)
-            add_builtin_define(parser, "GL_OES_EGL_image_external", 1);
-         if (extensions->OES_sample_variables) {
-            add_builtin_define(parser, "GL_OES_sample_variables", 1);
-            add_builtin_define(parser, "GL_OES_shader_multisample_interpolation", 1);
-         }
-         if (extensions->OES_standard_derivatives)
-            add_builtin_define(parser, "GL_OES_standard_derivatives", 1);
-         if (extensions->ARB_texture_multisample)
-            add_builtin_define(parser, "GL_OES_texture_storage_multisample_2d_array", 1);
-         if (extensions->ARB_blend_func_extended)
-            add_builtin_define(parser, "GL_EXT_blend_func_extended", 1);
-         if (extensions->ARB_cull_distance)
-            add_builtin_define(parser, "GL_EXT_clip_cull_distance", 1);
-
-         if (version >= 310) {
-            if (extensions->ARB_shader_image_load_store)
-               add_builtin_define(parser, "GL_OES_shader_image_atomic", 1);
-
-            if (extensions->OES_geometry_shader) {
-               add_builtin_define(parser, "GL_OES_geometry_point_size", 1);
-               add_builtin_define(parser, "GL_OES_geometry_shader", 1);
-            }
-            if (extensions->ARB_gpu_shader5) {
-               add_builtin_define(parser, "GL_EXT_gpu_shader5", 1);
-               add_builtin_define(parser, "GL_OES_gpu_shader5", 1);
-            }
-            if (extensions->OES_texture_buffer) {
-               add_builtin_define(parser, "GL_EXT_texture_buffer", 1);
-               add_builtin_define(parser, "GL_OES_texture_buffer", 1);
-            }
-
-            if (extensions->OES_shader_io_blocks) {
-               add_builtin_define(parser, "GL_EXT_shader_io_blocks", 1);
-               add_builtin_define(parser, "GL_OES_shader_io_blocks", 1);
-            }
-         }
-      }
-   } else {
-      add_builtin_define(parser, "GL_ARB_draw_buffers", 1);
-      add_builtin_define(parser, "GL_ARB_enhanced_layouts", 1);
-      add_builtin_define(parser, "GL_ARB_separate_shader_objects", 1);
-      add_builtin_define(parser, "GL_ARB_texture_rectangle", 1);
-      add_builtin_define(parser, "GL_AMD_shader_trinary_minmax", 1);
-
-      if (extensions != NULL) {
-         if (extensions->EXT_texture_array)
-            add_builtin_define(parser, "GL_EXT_texture_array", 1);
-
-         if (extensions->ARB_ES3_1_compatibility)
-            add_builtin_define(parser, "GL_ARB_ES3_1_compatibility", 1);
-
-         if (extensions->ARB_arrays_of_arrays)
-             add_builtin_define(parser, "GL_ARB_arrays_of_arrays", 1);
-
-         if (extensions->ARB_fragment_coord_conventions) {
-            add_builtin_define(parser, "GL_ARB_fragment_coord_conventions",
-                               1);
-         }
-
-         if (extensions->ARB_fragment_layer_viewport)
-            add_builtin_define(parser, "GL_ARB_fragment_layer_viewport", 1);
-
-         if (extensions->ARB_explicit_attrib_location)
-            add_builtin_define(parser, "GL_ARB_explicit_attrib_location", 1);
-
-         if (extensions->ARB_explicit_uniform_location)
-            add_builtin_define(parser, "GL_ARB_explicit_uniform_location", 1);
-
-         if (extensions->ARB_shader_texture_lod)
-            add_builtin_define(parser, "GL_ARB_shader_texture_lod", 1);
-
-         if (extensions->ARB_draw_instanced)
-            add_builtin_define(parser, "GL_ARB_draw_instanced", 1);
-
-         if (extensions->ARB_conservative_depth) {
-            add_builtin_define(parser, "GL_AMD_conservative_depth", 1);
-            add_builtin_define(parser, "GL_ARB_conservative_depth", 1);
-         }
-
-         if (extensions->ARB_shader_bit_encoding)
-            add_builtin_define(parser, "GL_ARB_shader_bit_encoding", 1);
-
-         if (extensions->ARB_shader_clock)
-            add_builtin_define(parser, "GL_ARB_shader_clock", 1);
-
-         if (extensions->ARB_uniform_buffer_object)
-            add_builtin_define(parser, "GL_ARB_uniform_buffer_object", 1);
-
-         if (extensions->ARB_texture_cube_map_array)
-            add_builtin_define(parser, "GL_ARB_texture_cube_map_array", 1);
-
-         if (extensions->ARB_shading_language_packing)
-            add_builtin_define(parser, "GL_ARB_shading_language_packing", 1);
-
-         if (extensions->ARB_texture_multisample)
-            add_builtin_define(parser, "GL_ARB_texture_multisample", 1);
-
-         if (extensions->ARB_texture_query_levels)
-            add_builtin_define(parser, "GL_ARB_texture_query_levels", 1);
-
-         if (extensions->ARB_texture_query_lod)
-            add_builtin_define(parser, "GL_ARB_texture_query_lod", 1);
-
-         if (extensions->ARB_gpu_shader5)
-            add_builtin_define(parser, "GL_ARB_gpu_shader5", 1);
-
-         if (extensions->ARB_gpu_shader_fp64)
-            add_builtin_define(parser, "GL_ARB_gpu_shader_fp64", 1);
-
-         if (extensions->ARB_vertex_attrib_64bit)
-            add_builtin_define(parser, "GL_ARB_vertex_attrib_64bit", 1);
-
-         if (extensions->AMD_vertex_shader_layer)
-            add_builtin_define(parser, "GL_AMD_vertex_shader_layer", 1);
-
-         if (extensions->AMD_vertex_shader_viewport_index)
-            add_builtin_define(parser, "GL_AMD_vertex_shader_viewport_index", 1);
-
-         if (extensions->ARB_shading_language_420pack)
-            add_builtin_define(parser, "GL_ARB_shading_language_420pack", 1);
-
-         if (extensions->ARB_sample_shading)
-            add_builtin_define(parser, "GL_ARB_sample_shading", 1);
-
-         if (extensions->ARB_texture_gather)
-            add_builtin_define(parser, "GL_ARB_texture_gather", 1);
-
-         if (extensions->ARB_shader_atomic_counters)
-            add_builtin_define(parser, "GL_ARB_shader_atomic_counters", 1);
-
-         if (extensions->ARB_shader_atomic_counter_ops)
-            add_builtin_define(parser, "GL_ARB_shader_atomic_counter_ops", 1);
-
-         if (extensions->ARB_viewport_array)
-            add_builtin_define(parser, "GL_ARB_viewport_array", 1);
-
-         if (extensions->ARB_compute_shader)
-            add_builtin_define(parser, "GL_ARB_compute_shader", 1);
-
-         if (extensions->ARB_shader_image_load_store)
-            add_builtin_define(parser, "GL_ARB_shader_image_load_store", 1);
-
-         if (extensions->ARB_shader_image_size)
-            add_builtin_define(parser, "GL_ARB_shader_image_size", 1);
-
-         if (extensions->ARB_shader_texture_image_samples)
-            add_builtin_define(parser, "GL_ARB_shader_texture_image_samples", 1);
-
-         if (extensions->ARB_derivative_control)
-            add_builtin_define(parser, "GL_ARB_derivative_control", 1);
-
-         if (extensions->ARB_shader_precision)
-            add_builtin_define(parser, "GL_ARB_shader_precision", 1);
-
-         if (extensions->ARB_shader_storage_buffer_object)
-            add_builtin_define(parser, "GL_ARB_shader_storage_buffer_object", 1);
-
-         if (extensions->ARB_tessellation_shader)
-            add_builtin_define(parser, "GL_ARB_tessellation_shader", 1);
-
-         if (extensions->ARB_shader_subroutine)
-            add_builtin_define(parser, "GL_ARB_shader_subroutine", 1);
-
-         if (extensions->ARB_shader_draw_parameters)
-            add_builtin_define(parser, "GL_ARB_shader_draw_parameters", 1);
-
-         if (extensions->ARB_cull_distance)
-            add_builtin_define(parser, "GL_ARB_cull_distance", 1);
-
-         if (extensions->ARB_shader_group_vote)
-            add_builtin_define(parser, "GL_ARB_shader_group_vote", 1);
-      }
-   }
-
-   if (extensions != NULL) {
-      if (extensions->EXT_shader_integer_mix)
-         add_builtin_define(parser, "GL_EXT_shader_integer_mix", 1);
-
-      if (extensions->EXT_shader_samples_identical)
-         add_builtin_define(parser, "GL_EXT_shader_samples_identical", 1);
-
-      if (extensions->MESA_shader_integer_functions)
-         add_builtin_define(parser, "GL_MESA_shader_integer_functions", 1);
-   }
-
-   if (version >= 150)
+   else if (version >= 150)
       add_builtin_define(parser, "GL_core_profile", 1);
 
    /* Currently, all ES2/ES3 implementations support highp in the
@@ -2495,6 +2304,11 @@ _glcpp_parser_handle_version_declaration(glcpp_parser_t *parser, intmax_t versio
    if (version >= 130 || parser->is_gles)
       add_builtin_define (parser, "GL_FRAGMENT_PRECISION_HIGH", 1);
 
+   /* Add all the extension macros available in this context */
+   if (parser->extensions)
+      parser->extensions(parser->state, add_builtin_define, parser,
+                         version, parser->is_gles);
+
    if (explicitly_set) {
       ralloc_asprintf_rewrite_tail(&parser->output, &parser->output_length,
                                    "#version %" PRIiMAX "%s%s", version,
diff --git a/src/compiler/glsl/glcpp/glcpp.c b/src/compiler/glsl/glcpp/glcpp.c
index c62f4efec9d..f08b14427f4 100644
--- a/src/compiler/glsl/glcpp/glcpp.c
+++ b/src/compiler/glsl/glcpp/glcpp.c
@@ -171,7 +171,7 @@ main (int argc, char *argv[])
 
 	_mesa_locale_init();
 
-	ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, &gl_ctx);
+	ret = glcpp_preprocess(ctx, &shader, &info_log, NULL, NULL, &gl_ctx);
 
 	printf("%s", shader);
 	fprintf(stderr, "%s", info_log);
diff --git a/src/compiler/glsl/glcpp/glcpp.h b/src/compiler/glsl/glcpp/glcpp.h
index d87e6b77dc5..07eaf684bee 100644
--- a/src/compiler/glsl/glcpp/glcpp.h
+++ b/src/compiler/glsl/glcpp/glcpp.h
@@ -171,6 +171,15 @@ typedef struct active_list {
 	struct active_list *next;
 } active_list_t;
 
+struct _mesa_glsl_parse_state;
+
+typedef void (*glcpp_extension_iterator)(
+		struct _mesa_glsl_parse_state *state,
+		void (*add_builtin_define)(glcpp_parser_t *, const char *, int),
+		glcpp_parser_t *data,
+		unsigned version,
+		bool es);
+
 struct glcpp_parser {
 	yyscan_t scanner;
 	struct hash_table *defines;
@@ -194,7 +203,8 @@ struct glcpp_parser {
 	size_t output_length;
 	size_t info_log_length;
 	int error;
-	const struct gl_extensions *extensions;
+	glcpp_extension_iterator extensions;
+	void *state;
 	gl_api api;
 	bool version_resolved;
 	bool has_new_line_number;
@@ -204,10 +214,8 @@ struct glcpp_parser {
 	bool is_gles;
 };
 
-struct gl_extensions;
-
 glcpp_parser_t *
-glcpp_parser_create (const struct gl_extensions *extensions, gl_api api);
+glcpp_parser_create (glcpp_extension_iterator extensions, void *state, gl_api api);
 
 int
 glcpp_parser_parse (glcpp_parser_t *parser);
@@ -220,7 +228,8 @@ glcpp_parser_resolve_implicit_version(glcpp_parser_t *parser);
 
 int
 glcpp_preprocess(void *ralloc_ctx, const char **shader, char **info_log,
-	   const struct gl_extensions *extensions, struct gl_context *g_ctx);
+		 glcpp_extension_iterator extensions, void *state,
+		 struct gl_context *g_ctx);
 
 /* Functions for writing to the info log */
 
diff --git a/src/compiler/glsl/glcpp/pp.c b/src/compiler/glsl/glcpp/pp.c
index 160c6662ff6..b5912799371 100644
--- a/src/compiler/glsl/glcpp/pp.c
+++ b/src/compiler/glsl/glcpp/pp.c
@@ -213,10 +213,12 @@ remove_line_continuations(glcpp_parser_t *ctx, const char *shader)
 
 int
 glcpp_preprocess(void *ralloc_ctx, const char **shader, char **info_log,
-	   const struct gl_extensions *extensions, struct gl_context *gl_ctx)
+                 glcpp_extension_iterator extensions, void *state,
+                 struct gl_context *gl_ctx)
 {
 	int errors;
-	glcpp_parser_t *parser = glcpp_parser_create (extensions, gl_ctx->API);
+	glcpp_parser_t *parser =
+		glcpp_parser_create(extensions, state, gl_ctx->API);
 
 	if (! gl_ctx->Const.DisableGLSLLineContinuations)
 		*shader = remove_line_continuations(parser, *shader);
diff --git a/src/compiler/glsl/glsl_parser_extras.cpp b/src/compiler/glsl/glsl_parser_extras.cpp
index 007743497d4..ff638fd8013 100644
--- a/src/compiler/glsl/glsl_parser_extras.cpp
+++ b/src/compiler/glsl/glsl_parser_extras.cpp
@@ -50,6 +50,8 @@ glsl_compute_version_string(void *mem_ctx, bool is_es, unsigned version)
 
 static const unsigned known_desktop_glsl_versions[] =
    { 110, 120, 130, 140, 150, 330, 400, 410, 420, 430, 440, 450 };
+static const unsigned known_desktop_gl_versions[] =
+   {  20,  21,  30,  31,  32,  33,  40,  41,  42,  43,  44,  45 };
 
 
 _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
@@ -75,6 +77,7 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->language_version = 110;
    this->forced_language_version = ctx->Const.ForceGLSLVersion;
    this->zero_init = ctx->Const.GLSLZeroInit;
+   this->gl_version = 20;
    this->es_shader = false;
    this->ARB_texture_rectangle_enable = true;
 
@@ -195,9 +198,9 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    this->subroutine_types = NULL;
 
    /* supported_versions should be large enough to support the known desktop
-    * GLSL versions plus 3 GLES versions (ES 1.00, ES 3.00, and ES 3.10))
+    * GLSL versions plus 4 GLES versions (ES 1.00, ES 3.00, ES 3.10, ES 3.20)
     */
-   STATIC_ASSERT((ARRAY_SIZE(known_desktop_glsl_versions) + 3) ==
+   STATIC_ASSERT((ARRAY_SIZE(known_desktop_glsl_versions) + 4) ==
                  ARRAY_SIZE(this->supported_versions));
 
    /* Populate the list of supported GLSL versions */
@@ -212,6 +215,8 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
          if (known_desktop_glsl_versions[i] <= ctx->Const.GLSLVersion) {
             this->supported_versions[this->num_supported_versions].ver
                = known_desktop_glsl_versions[i];
+            this->supported_versions[this->num_supported_versions].gl_ver
+               = known_desktop_gl_versions[i];
             this->supported_versions[this->num_supported_versions].es = false;
             this->num_supported_versions++;
          }
@@ -219,22 +224,26 @@ _mesa_glsl_parse_state::_mesa_glsl_parse_state(struct gl_context *_ctx,
    }
    if (ctx->API == API_OPENGLES2 || ctx->Extensions.ARB_ES2_compatibility) {
       this->supported_versions[this->num_supported_versions].ver = 100;
+      this->supported_versions[this->num_supported_versions].gl_ver = 20;
       this->supported_versions[this->num_supported_versions].es = true;
       this->num_supported_versions++;
    }
    if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
       this->supported_versions[this->num_supported_versions].ver = 300;
+      this->supported_versions[this->num_supported_versions].gl_ver = 30;
       this->supported_versions[this->num_supported_versions].es = true;
       this->num_supported_versions++;
    }
    if (_mesa_is_gles31(ctx) || ctx->Extensions.ARB_ES3_1_compatibility) {
       this->supported_versions[this->num_supported_versions].ver = 310;
+      this->supported_versions[this->num_supported_versions].gl_ver = 31;
       this->supported_versions[this->num_supported_versions].es = true;
       this->num_supported_versions++;
    }
    if ((ctx->API == API_OPENGLES2 && ctx->Version >= 32) ||
        ctx->Extensions.ARB_ES3_2_compatibility) {
       this->supported_versions[this->num_supported_versions].ver = 320;
+      this->supported_versions[this->num_supported_versions].gl_ver = 32;
       this->supported_versions[this->num_supported_versions].es = true;
       this->num_supported_versions++;
    }
@@ -399,6 +408,7 @@ _mesa_glsl_parse_state::process_version_directive(YYLTYPE *locp, int version,
    for (unsigned i = 0; i < this->num_supported_versions; i++) {
       if (this->supported_versions[i].ver == this->language_version
           && this->supported_versions[i].es == this->es_shader) {
+         this->gl_version = this->supported_versions[i].gl_ver;
          supported = true;
          break;
       }
@@ -511,28 +521,12 @@ struct _mesa_glsl_extension {
     */
    const char *name;
 
-   /** True if this extension is available to desktop GL shaders */
-   bool avail_in_GL;
-
-   /** True if this extension is available to GLES shaders */
-   bool avail_in_ES;
-
    /**
-    * Flag in the gl_extensions struct indicating whether this
-    * extension is supported by the driver, or
-    * &gl_extensions::dummy_true if supported by all drivers.
-    *
-    * Note: the type (GLboolean gl_extensions::*) is a "pointer to
-    * member" type, the type-safe alternative to the "offsetof" macro.
-    * In a nutshell:
-    *
-    * - foo bar::* p declares p to be an "offset" to a field of type
-    *   foo that exists within struct bar
-    * - &bar::baz computes the "offset" of field baz within struct bar
-    * - x.*p accesses the field of x that exists at "offset" p
-    * - x->*p is equivalent to (*x).*p
+    * Predicate that checks whether the relevant extension is available for
+    * this context.
     */
-   const GLboolean gl_extensions::* supported_flag;
+   bool (*available_pred)(const struct gl_context *,
+                          gl_api api, uint8_t version);
 
    /**
     * Flag in the _mesa_glsl_parse_state struct that should be set
@@ -553,12 +547,24 @@ struct _mesa_glsl_extension {
    bool _mesa_glsl_parse_state::* warn_flag;
 
 
-   bool compatible_with_state(const _mesa_glsl_parse_state *state) const;
+   bool compatible_with_state(const _mesa_glsl_parse_state *state,
+                              gl_api api, uint8_t gl_version) const;
    void set_flags(_mesa_glsl_parse_state *state, ext_behavior behavior) const;
 };
 
-#define EXT(NAME, GL, ES, SUPPORTED_FLAG)                   \
-   { "GL_" #NAME, GL, ES, &gl_extensions::SUPPORTED_FLAG,   \
+/** Checks if the context supports a user-facing extension */
+#define EXT(name_str, driver_cap, ...) \
+static MAYBE_UNUSED bool \
+has_##name_str(const struct gl_context *ctx, gl_api api, uint8_t version) \
+{ \
+   return ctx->Extensions.driver_cap && (version >= \
+          _mesa_extension_table[MESA_EXTENSION_##name_str].version[api]); \
+}
+#include "main/extensions_table.h"
+#undef EXT
+
+#define EXT(NAME)                                           \
+   { "GL_" #NAME, has_##NAME,                         \
          &_mesa_glsl_parse_state::NAME##_enable,            \
          &_mesa_glsl_parse_state::NAME##_warn }
 
@@ -567,92 +573,89 @@ struct _mesa_glsl_extension {
  * and the conditions under which they are supported.
  */
 static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
-   /*                                  API availability */
-   /* name                             GL     ES         supported flag */
-
    /* ARB extensions go here, sorted alphabetically.
     */
-   EXT(ARB_ES3_1_compatibility,          true,  false,     ARB_ES3_1_compatibility),
-   EXT(ARB_ES3_2_compatibility,          true,  false,     ARB_ES3_2_compatibility),
-   EXT(ARB_arrays_of_arrays,             true,  false,     ARB_arrays_of_arrays),
-   EXT(ARB_compute_shader,               true,  false,     ARB_compute_shader),
-   EXT(ARB_conservative_depth,           true,  false,     ARB_conservative_depth),
-   EXT(ARB_cull_distance,                true,  false,     ARB_cull_distance),
-   EXT(ARB_derivative_control,           true,  false,     ARB_derivative_control),
-   EXT(ARB_draw_buffers,                 true,  false,     dummy_true),
-   EXT(ARB_draw_instanced,               true,  false,     ARB_draw_instanced),
-   EXT(ARB_enhanced_layouts,             true,  false,     ARB_enhanced_layouts),
-   EXT(ARB_explicit_attrib_location,     true,  false,     ARB_explicit_attrib_location),
-   EXT(ARB_explicit_uniform_location,    true,  false,     ARB_explicit_uniform_location),
-   EXT(ARB_fragment_coord_conventions,   true,  false,     ARB_fragment_coord_conventions),
-   EXT(ARB_fragment_layer_viewport,      true,  false,     ARB_fragment_layer_viewport),
-   EXT(ARB_gpu_shader5,                  true,  false,     ARB_gpu_shader5),
-   EXT(ARB_gpu_shader_fp64,              true,  false,     ARB_gpu_shader_fp64),
-   EXT(ARB_sample_shading,               true,  false,     ARB_sample_shading),
-   EXT(ARB_separate_shader_objects,      true,  false,     dummy_true),
-   EXT(ARB_shader_atomic_counter_ops,    true,  false,     ARB_shader_atomic_counter_ops),
-   EXT(ARB_shader_atomic_counters,       true,  false,     ARB_shader_atomic_counters),
-   EXT(ARB_shader_bit_encoding,          true,  false,     ARB_shader_bit_encoding),
-   EXT(ARB_shader_clock,                 true,  false,     ARB_shader_clock),
-   EXT(ARB_shader_draw_parameters,       true,  false,     ARB_shader_draw_parameters),
-   EXT(ARB_shader_group_vote,            true,  false,     ARB_shader_group_vote),
-   EXT(ARB_shader_image_load_store,      true,  false,     ARB_shader_image_load_store),
-   EXT(ARB_shader_image_size,            true,  false,     ARB_shader_image_size),
-   EXT(ARB_shader_precision,             true,  false,     ARB_shader_precision),
-   EXT(ARB_shader_stencil_export,        true,  false,     ARB_shader_stencil_export),
-   EXT(ARB_shader_storage_buffer_object, true,  true,      ARB_shader_storage_buffer_object),
-   EXT(ARB_shader_subroutine,            true,  false,     ARB_shader_subroutine),
-   EXT(ARB_shader_texture_image_samples, true,  false,     ARB_shader_texture_image_samples),
-   EXT(ARB_shader_texture_lod,           true,  false,     ARB_shader_texture_lod),
-   EXT(ARB_shading_language_420pack,     true,  false,     ARB_shading_language_420pack),
-   EXT(ARB_shading_language_packing,     true,  false,     ARB_shading_language_packing),
-   EXT(ARB_tessellation_shader,          true,  false,     ARB_tessellation_shader),
-   EXT(ARB_texture_cube_map_array,       true,  false,     ARB_texture_cube_map_array),
-   EXT(ARB_texture_gather,               true,  false,     ARB_texture_gather),
-   EXT(ARB_texture_multisample,          true,  false,     ARB_texture_multisample),
-   EXT(ARB_texture_query_levels,         true,  false,     ARB_texture_query_levels),
-   EXT(ARB_texture_query_lod,            true,  false,     ARB_texture_query_lod),
-   EXT(ARB_texture_rectangle,            true,  false,     dummy_true),
-   EXT(ARB_uniform_buffer_object,        true,  false,     ARB_uniform_buffer_object),
-   EXT(ARB_vertex_attrib_64bit,          true,  false,     ARB_vertex_attrib_64bit),
-   EXT(ARB_viewport_array,               true,  false,     ARB_viewport_array),
+   EXT(ARB_ES3_1_compatibility),
+   EXT(ARB_ES3_2_compatibility),
+   EXT(ARB_arrays_of_arrays),
+   EXT(ARB_compute_shader),
+   EXT(ARB_conservative_depth),
+   EXT(ARB_cull_distance),
+   EXT(ARB_derivative_control),
+   EXT(ARB_draw_buffers),
+   EXT(ARB_draw_instanced),
+   EXT(ARB_enhanced_layouts),
+   EXT(ARB_explicit_attrib_location),
+   EXT(ARB_explicit_uniform_location),
+   EXT(ARB_fragment_coord_conventions),
+   EXT(ARB_fragment_layer_viewport),
+   EXT(ARB_gpu_shader5),
+   EXT(ARB_gpu_shader_fp64),
+   EXT(ARB_sample_shading),
+   EXT(ARB_separate_shader_objects),
+   EXT(ARB_shader_atomic_counter_ops),
+   EXT(ARB_shader_atomic_counters),
+   EXT(ARB_shader_bit_encoding),
+   EXT(ARB_shader_clock),
+   EXT(ARB_shader_draw_parameters),
+   EXT(ARB_shader_group_vote),
+   EXT(ARB_shader_image_load_store),
+   EXT(ARB_shader_image_size),
+   EXT(ARB_shader_precision),
+   EXT(ARB_shader_stencil_export),
+   EXT(ARB_shader_storage_buffer_object),
+   EXT(ARB_shader_subroutine),
+   EXT(ARB_shader_texture_image_samples),
+   EXT(ARB_shader_texture_lod),
+   EXT(ARB_shading_language_420pack),
+   EXT(ARB_shading_language_packing),
+   EXT(ARB_tessellation_shader),
+   EXT(ARB_texture_cube_map_array),
+   EXT(ARB_texture_gather),
+   EXT(ARB_texture_multisample),
+   EXT(ARB_texture_query_levels),
+   EXT(ARB_texture_query_lod),
+   EXT(ARB_texture_rectangle),
+   EXT(ARB_uniform_buffer_object),
+   EXT(ARB_vertex_attrib_64bit),
+   EXT(ARB_viewport_array),
 
    /* KHR extensions go here, sorted alphabetically.
     */
 
    /* OES extensions go here, sorted alphabetically.
     */
-   EXT(OES_EGL_image_external,         false, true,      OES_EGL_image_external),
-   EXT(OES_geometry_point_size,        false, true,      OES_geometry_shader),
-   EXT(OES_geometry_shader,            false, true,      OES_geometry_shader),
-   EXT(OES_gpu_shader5,                false, true,      ARB_gpu_shader5),
-   EXT(OES_sample_variables,           false, true,      OES_sample_variables),
-   EXT(OES_shader_image_atomic,        false, true,      ARB_shader_image_load_store),
-   EXT(OES_shader_io_blocks,           false, true,      OES_shader_io_blocks),
-   EXT(OES_shader_multisample_interpolation, false, true, OES_sample_variables),
-   EXT(OES_standard_derivatives,       false, true,      OES_standard_derivatives),
-   EXT(OES_texture_3D,                 false, true,      dummy_true),
-   EXT(OES_texture_buffer,             false, true,      OES_texture_buffer),
-   EXT(OES_texture_storage_multisample_2d_array, false, true, ARB_texture_multisample),
+   EXT(OES_EGL_image_external),
+   EXT(OES_geometry_point_size),
+   EXT(OES_geometry_shader),
+   EXT(OES_gpu_shader5),
+   EXT(OES_sample_variables),
+   EXT(OES_shader_image_atomic),
+   EXT(OES_shader_io_blocks),
+   EXT(OES_shader_multisample_interpolation),
+   EXT(OES_standard_derivatives),
+   EXT(OES_texture_3D),
+   EXT(OES_texture_buffer),
+   EXT(OES_texture_storage_multisample_2d_array),
 
    /* All other extensions go here, sorted alphabetically.
     */
-   EXT(AMD_conservative_depth,         true,  false,     ARB_conservative_depth),
-   EXT(AMD_shader_stencil_export,      true,  false,     ARB_shader_stencil_export),
-   EXT(AMD_shader_trinary_minmax,      true,  false,     dummy_true),
-   EXT(AMD_vertex_shader_layer,        true,  false,     AMD_vertex_shader_layer),
-   EXT(AMD_vertex_shader_viewport_index, true,  false,   AMD_vertex_shader_viewport_index),
-   EXT(EXT_blend_func_extended,        false,  true,     ARB_blend_func_extended),
-   EXT(EXT_draw_buffers,               false,  true,     dummy_true),
-   EXT(EXT_clip_cull_distance,         false, true,      ARB_cull_distance),
-   EXT(EXT_gpu_shader5,                false, true,      ARB_gpu_shader5),
-   EXT(EXT_separate_shader_objects,    false, true,      dummy_true),
-   EXT(EXT_shader_integer_mix,         true,  true,      EXT_shader_integer_mix),
-   EXT(EXT_shader_io_blocks,           false, true,      OES_shader_io_blocks),
-   EXT(EXT_shader_samples_identical,   true,  true,      EXT_shader_samples_identical),
-   EXT(EXT_texture_array,              true,  false,     EXT_texture_array),
-   EXT(EXT_texture_buffer,             false, true,      OES_texture_buffer),
-   EXT(MESA_shader_integer_functions,  true,  true,      MESA_shader_integer_functions),
+   EXT(AMD_conservative_depth),
+   EXT(AMD_shader_stencil_export),
+   EXT(AMD_shader_trinary_minmax),
+   EXT(AMD_vertex_shader_layer),
+   EXT(AMD_vertex_shader_viewport_index),
+   EXT(EXT_blend_func_extended),
+   EXT(EXT_draw_buffers),
+   EXT(EXT_clip_cull_distance),
+   EXT(EXT_gpu_shader5),
+   EXT(EXT_separate_shader_objects),
+   EXT(EXT_shader_integer_mix),
+   EXT(EXT_shader_io_blocks),
+   EXT(EXT_shader_samples_identical),
+   EXT(EXT_texture_array),
+   EXT(EXT_texture_buffer),
+   EXT(MESA_shader_integer_functions),
 };
 
 #undef EXT
@@ -662,26 +665,10 @@ static const _mesa_glsl_extension _mesa_glsl_supported_extensions[] = {
  * Determine whether a given extension is compatible with the target,
  * API, and extension information in the current parser state.
  */
-bool _mesa_glsl_extension::compatible_with_state(const _mesa_glsl_parse_state *
-                                                 state) const
+bool _mesa_glsl_extension::compatible_with_state(
+      const _mesa_glsl_parse_state *state, gl_api api, uint8_t gl_version) const
 {
-   /* Check that this extension matches whether we are compiling
-    * for desktop GL or GLES.
-    */
-   if (state->es_shader) {
-      if (!this->avail_in_ES) return false;
-   } else {
-      if (!this->avail_in_GL) return false;
-   }
-
-   /* Check that this extension is supported by the OpenGL
-    * implementation.
-    *
-    * Note: the ->* operator indexes into state->extensions by the
-    * offset this->supported_flag.  See
-    * _mesa_glsl_extension::supported_flag for more info.
-    */
-   return state->extensions->*(this->supported_flag);
+   return this->available_pred(state->ctx, api, gl_version);
 }
 
 /**
@@ -719,6 +706,8 @@ _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 			     const char *behavior_string, YYLTYPE *behavior_locp,
 			     _mesa_glsl_parse_state *state)
 {
+   uint8_t gl_version = state->ctx->Extensions.Version;
+   gl_api api = state->ctx->API;
    ext_behavior behavior;
    if (strcmp(behavior_string, "warn") == 0) {
       behavior = extension_warn;
@@ -735,6 +724,17 @@ _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
       return false;
    }
 
+   /* If we're in a desktop context but with an ES shader, use an ES API enum
+    * to verify extension availability.
+    */
+   if (state->es_shader && api != API_OPENGLES2)
+      api = API_OPENGLES2;
+   /* Use the language-version derived GL version to extension checks, unless
+    * we're using meta, which sets the version to the max.
+    */
+   if (gl_version != 0xff)
+      gl_version = state->gl_version;
+
    if (strcmp(name, "all") == 0) {
       if ((behavior == extension_enable) || (behavior == extension_require)) {
 	 _mesa_glsl_error(name_locp, state, "cannot %s all extensions",
@@ -746,14 +746,14 @@ _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
               i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
             const _mesa_glsl_extension *extension
                = &_mesa_glsl_supported_extensions[i];
-            if (extension->compatible_with_state(state)) {
+            if (extension->compatible_with_state(state, api, gl_version)) {
                _mesa_glsl_supported_extensions[i].set_flags(state, behavior);
             }
          }
       }
    } else {
       const _mesa_glsl_extension *extension = find_extension(name);
-      if (extension && extension->compatible_with_state(state)) {
+      if (extension && extension->compatible_with_state(state, api, gl_version)) {
          extension->set_flags(state, behavior);
       } else {
          static const char fmt[] = "extension `%s' unsupported in %s shader";
@@ -1790,6 +1790,43 @@ assign_subroutine_indexes(struct gl_shader *sh,
    }
 }
 
+static void
+add_builtin_defines(struct _mesa_glsl_parse_state *state,
+                    void (*add_builtin_define)(struct glcpp_parser *, const char *, int),
+                    struct glcpp_parser *data,
+                    unsigned version,
+                    bool es)
+{
+   unsigned gl_version = state->ctx->Extensions.Version;
+   gl_api api = state->ctx->API;
+
+   if (gl_version != 0xff) {
+      unsigned i;
+      for (i = 0; i < state->num_supported_versions; i++) {
+         if (state->supported_versions[i].ver == version &&
+             state->supported_versions[i].es == es) {
+            gl_version = state->supported_versions[i].gl_ver;
+            break;
+         }
+      }
+
+      if (i == state->num_supported_versions)
+         return;
+   }
+
+   if (es)
+      api = API_OPENGLES2;
+
+   for (unsigned i = 0;
+        i < ARRAY_SIZE(_mesa_glsl_supported_extensions); ++i) {
+      const _mesa_glsl_extension *extension
+         = &_mesa_glsl_supported_extensions[i];
+      if (extension->compatible_with_state(state, api, gl_version)) {
+         add_builtin_define(data, extension->name, 1);
+      }
+   }
+}
+
 void
 _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
                           bool dump_ast, bool dump_hir)
@@ -1803,7 +1840,7 @@ _mesa_glsl_compile_shader(struct gl_context *ctx, struct gl_shader *shader,
                               false, true);
 
    state->error = glcpp_preprocess(state, &source, &state->info_log,
-                             &ctx->Extensions, ctx);
+                             add_builtin_defines, state, ctx);
 
    if (!state->error) {
      _mesa_glsl_lexer_ctor(state, source);
diff --git a/src/compiler/glsl/glsl_parser_extras.h b/src/compiler/glsl/glsl_parser_extras.h
index 9548e62532f..cca7fa8e0ee 100644
--- a/src/compiler/glsl/glsl_parser_extras.h
+++ b/src/compiler/glsl/glsl_parser_extras.h
@@ -300,13 +300,15 @@ struct _mesa_glsl_parse_state {
    unsigned num_supported_versions;
    struct {
       unsigned ver;
+      uint8_t gl_ver;
       bool es;
-   } supported_versions[15];
+   } supported_versions[16];
 
    bool es_shader;
    unsigned language_version;
    unsigned forced_language_version;
    bool zero_init;
+   unsigned gl_version;
    gl_shader_stage stage;
 
    /**
@@ -803,8 +805,19 @@ extern bool _mesa_glsl_process_extension(const char *name, YYLTYPE *name_locp,
 extern "C" {
 #endif
 
+struct glcpp_parser;
+
+typedef void (*glcpp_extension_iterator)(
+		struct _mesa_glsl_parse_state *state,
+		void (*add_builtin_define)(struct glcpp_parser *, const char *, int),
+		struct glcpp_parser *data,
+		unsigned version,
+		bool es);
+
 extern int glcpp_preprocess(void *ctx, const char **shader, char **info_log,
-                      const struct gl_extensions *extensions, struct gl_context *gl_ctx);
+                            glcpp_extension_iterator extensions,
+                            struct _mesa_glsl_parse_state *state,
+                            struct gl_context *gl_ctx);
 
 extern void _mesa_destroy_shader_compiler(void);
 extern void _mesa_destroy_shader_compiler_caches(void);
diff --git a/src/compiler/glsl/test_optpass.cpp b/src/compiler/glsl/test_optpass.cpp
index f19d7e6e6d5..852af1919bc 100644
--- a/src/compiler/glsl/test_optpass.cpp
+++ b/src/compiler/glsl/test_optpass.cpp
@@ -220,7 +220,7 @@ int test_optpass(int argc, char **argv)
       shader->Source = input.c_str();
       const char *source = shader->Source;
       state->error = glcpp_preprocess(state, &source, &state->info_log,
-                                state->extensions, ctx) != 0;
+                                      NULL, NULL, ctx) != 0;
 
       if (!state->error) {
          _mesa_glsl_lexer_ctor(state, source);
diff --git a/src/mesa/Android.libmesa_glsl_utils.mk b/src/mesa/Android.libmesa_glsl_utils.mk
index 5a80f221c8f..dfea801b057 100644
--- a/src/mesa/Android.libmesa_glsl_utils.mk
+++ b/src/mesa/Android.libmesa_glsl_utils.mk
@@ -42,6 +42,7 @@ LOCAL_C_INCLUDES := \
 	$(MESA_TOP)/src/gallium/auxiliary
 
 LOCAL_SRC_FILES := \
+	main/extensions_table.c \
 	main/imports.c \
 	program/prog_hash_table.c \
 	program/symbol_table.c \
@@ -67,6 +68,7 @@ LOCAL_C_INCLUDES := \
 	$(MESA_TOP)/src/gallium/auxiliary
 
 LOCAL_SRC_FILES := \
+	main/extensions_table.c \
 	main/imports.c \
 	program/prog_hash_table.c \
 	program/symbol_table.c \
diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources
index aa06860a73e..a16968d7e87 100644
--- a/src/mesa/Makefile.sources
+++ b/src/mesa/Makefile.sources
@@ -79,6 +79,7 @@ MAIN_FILES = \
 	main/execmem.c \
 	main/extensions.c \
 	main/extensions.h \
+	main/extensions_table.c \
 	main/extensions_table.h \
 	main/fbobject.c \
 	main/fbobject.h \
diff --git a/src/mesa/main/extensions.c b/src/mesa/main/extensions.c
index fa50cb68cca..62a731675d7 100644
--- a/src/mesa/main/extensions.c
+++ b/src/mesa/main/extensions.c
@@ -48,26 +48,7 @@ static char *extra_extensions = NULL;
  */
 #define o(x) offsetof(struct gl_extensions, x)
 
-
-/**
- * \brief Table of supported OpenGL extensions for all API's.
- */
-const struct mesa_extension _mesa_extension_table[] = {
-#define EXT(name_str, driver_cap, gll_ver, glc_ver, gles_ver, gles2_ver, yyyy) \
-        { .name = "GL_" #name_str, .offset = o(driver_cap), \
-          .version = { \
-            [API_OPENGL_COMPAT] = gll_ver, \
-            [API_OPENGL_CORE]   = glc_ver, \
-            [API_OPENGLES]      = gles_ver, \
-            [API_OPENGLES2]     = gles2_ver, \
-           }, \
-           .year = yyyy \
-        },
-#include "extensions_table.h"
-#undef EXT
-};
-
-static bool disabled_extensions[ARRAY_SIZE(_mesa_extension_table)];
+static bool disabled_extensions[MESA_EXTENSION_COUNT];
 
 /**
  * Given an extension name, lookup up the corresponding member of struct
@@ -85,7 +66,7 @@ name_to_index(const char* name)
    if (name == 0)
       return -1;
 
-   for (i = 0; i < ARRAY_SIZE(_mesa_extension_table); ++i) {
+   for (i = 0; i < MESA_EXTENSION_COUNT; ++i) {
       if (strcmp(name, _mesa_extension_table[i].name) == 0)
 	 return i;
    }
@@ -107,7 +88,7 @@ override_extensions_in_context(struct gl_context *ctx)
       (GLboolean*) &_mesa_extension_override_disables;
    GLboolean *ctx_ext = (GLboolean*)&ctx->Extensions;
 
-   for (i = 0; i < ARRAY_SIZE(_mesa_extension_table); ++i) {
+   for (i = 0; i < MESA_EXTENSION_COUNT; ++i) {
       size_t offset = _mesa_extension_table[i].offset;
 
       assert(!enables[offset] || !disables[offset]);
@@ -447,7 +428,7 @@ _mesa_make_extension_string(struct gl_context *ctx)
 
    /* Compute length of the extension string. */
    count = 0;
-   for (k = 0; k < ARRAY_SIZE(_mesa_extension_table); ++k) {
+   for (k = 0; k < MESA_EXTENSION_COUNT; ++k) {
       const struct mesa_extension *i = _mesa_extension_table + k;
 
       if (i->year <= maxYear &&
@@ -478,7 +459,7 @@ _mesa_make_extension_string(struct gl_context *ctx)
     * expect will fit into that buffer.
     */
    j = 0;
-   for (k = 0; k < ARRAY_SIZE(_mesa_extension_table); ++k) {
+   for (k = 0; k < MESA_EXTENSION_COUNT; ++k) {
       if (_mesa_extension_table[k].year <= maxYear &&
          _mesa_extension_supported(ctx, k)) {
          extension_indices[j++] = k;
@@ -516,7 +497,7 @@ _mesa_get_extension_count(struct gl_context *ctx)
    if (ctx->Extensions.Count != 0)
       return ctx->Extensions.Count;
 
-   for (k = 0; k < ARRAY_SIZE(_mesa_extension_table); ++k) {
+   for (k = 0; k < MESA_EXTENSION_COUNT; ++k) {
       if (_mesa_extension_supported(ctx, k))
 	 ctx->Extensions.Count++;
    }
@@ -532,7 +513,7 @@ _mesa_get_enabled_extension(struct gl_context *ctx, GLuint index)
    size_t n = 0;
    unsigned i;
 
-   for (i = 0; i < ARRAY_SIZE(_mesa_extension_table); ++i) {
+   for (i = 0; i < MESA_EXTENSION_COUNT; ++i) {
       if (_mesa_extension_supported(ctx, i)) {
          if (n == index)
             return (const GLubyte*) _mesa_extension_table[i].name;
diff --git a/src/mesa/main/extensions.h b/src/mesa/main/extensions.h
index 43ef6aa6451..efef1be4751 100644
--- a/src/mesa/main/extensions.h
+++ b/src/mesa/main/extensions.h
@@ -89,6 +89,7 @@ enum {
 #define EXT(name_str, ...) MESA_EXTENSION_##name_str,
 #include "extensions_table.h"
 #undef EXT
+MESA_EXTENSION_COUNT
 };
 
 
diff --git a/src/mesa/main/extensions_table.c b/src/mesa/main/extensions_table.c
new file mode 100644
index 00000000000..1e37fbcc462
--- /dev/null
+++ b/src/mesa/main/extensions_table.c
@@ -0,0 +1,51 @@
+/*
+ * Mesa 3-D graphics library
+ *
+ * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
+ * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "main/mtypes.h"
+#include "main/extensions.h"
+
+/**
+ * Given a member \c x of struct gl_extensions, return offset of
+ * \c x in bytes.
+ */
+#define o(x) offsetof(struct gl_extensions, x)
+
+/**
+ * \brief Table of supported OpenGL extensions for all API's.
+ */
+const struct mesa_extension _mesa_extension_table[] = {
+#define EXT(name_str, driver_cap, gll_ver, glc_ver, gles_ver, gles2_ver, yyyy) \
+        { .name = "GL_" #name_str, .offset = o(driver_cap), \
+          .version = { \
+            [API_OPENGL_COMPAT] = gll_ver, \
+            [API_OPENGL_CORE]   = glc_ver, \
+            [API_OPENGLES]      = gles_ver, \
+            [API_OPENGLES2]     = gles2_ver, \
+           }, \
+           .year = yyyy \
+        },
+#include "extensions_table.h"
+#undef EXT
+};
-- 
2.30.2