Merge branch 'master' of git+ssh://keithw@git.freedesktop.org/git/mesa/mesa into...
[mesa.git] / src / mesa / main / extensions.c
index 1d14a82288d54e359720b47414bb797531897e7b..b61cb821f7d02725274ed0b93c5a353e9925b157 100644 (file)
@@ -1,10 +1,8 @@
-/* $Id: extensions.c,v 1.60 2001/05/24 14:47:56 brianp Exp $ */
-
 /*
  * Mesa 3-D graphics library
- * Version:  3.5
+ * Version:  6.5.1
  *
- * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * Copyright (C) 1999-2006  Brian Paul   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"),
  */
 
 
-#ifdef PC_HEADER
-#include "all.h"
-#else
 #include "glheader.h"
+#include "imports.h"
 #include "context.h"
 #include "extensions.h"
-#include "mem.h"
 #include "simple_list.h"
 #include "mtypes.h"
-#endif
 
 
-#define MAX_EXT_NAMELEN 80
-
-struct extension {
-   struct extension *next, *prev;
-   GLint enabled;
-   GLboolean *flag;                    /* optional flag stored elsewhere */
-   char name[MAX_EXT_NAMELEN+1];
-   void (*notify)( GLcontext *, GLboolean );
-};
-
-#define F(x) (int)&(((struct gl_extensions *)0)->x)
+#define F(x) (int)(uintptr_t)&(((struct gl_extensions *)0)->x)
 #define ON GL_TRUE
 #define OFF GL_FALSE
 
-static struct {
+
+/*
+ * Note: The GL_MESAX_* extensions are placeholders for future ARB extensions.
+ */
+static const struct {
    GLboolean enabled;
    const char *name;
    int flag_offset;
 } default_extensions[] = {
+   { OFF, "GL_ARB_depth_texture",              F(ARB_depth_texture) },
+   { OFF, "GL_ARB_draw_buffers",               F(ARB_draw_buffers) },
+   { OFF, "GL_ARB_fragment_program",           F(ARB_fragment_program) },
+   { OFF, "GL_ARB_fragment_shader",            F(ARB_fragment_shader) },
+   { OFF, "GL_ARB_half_float_pixel",           F(ARB_half_float_pixel) },
    { OFF, "GL_ARB_imaging",                    F(ARB_imaging) },
+   { OFF, "GL_ARB_multisample",                F(ARB_multisample) },
    { OFF, "GL_ARB_multitexture",               F(ARB_multitexture) },
+   { OFF, "GL_ARB_occlusion_query",            F(ARB_occlusion_query) },
+   { OFF, "GL_ARB_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
+   { OFF, "GL_ARB_point_parameters",           F(EXT_point_parameters) },
+   { OFF, "GL_ARB_point_sprite",               F(ARB_point_sprite) },
+   { OFF, "GL_ARB_shader_objects",             F(ARB_shader_objects) },
+   { OFF, "GL_ARB_shading_language_100",       F(ARB_shading_language_100) },
+   { OFF, "GL_ARB_shading_language_120",       F(ARB_shading_language_120) },
+   { OFF, "GL_ARB_shadow",                     F(ARB_shadow) },
+   { OFF, "GL_ARB_shadow_ambient",             F(SGIX_shadow_ambient) },
    { OFF, "GL_ARB_texture_border_clamp",       F(ARB_texture_border_clamp) },
    { OFF, "GL_ARB_texture_compression",        F(ARB_texture_compression) },
    { OFF, "GL_ARB_texture_cube_map",           F(ARB_texture_cube_map) },
    { OFF, "GL_ARB_texture_env_add",            F(EXT_texture_env_add) },
    { OFF, "GL_ARB_texture_env_combine",        F(ARB_texture_env_combine) },
+   { OFF, "GL_ARB_texture_env_crossbar",       F(ARB_texture_env_crossbar) },
    { OFF, "GL_ARB_texture_env_dot3",           F(ARB_texture_env_dot3) },
-   { ON,  "GL_ARB_transpose_matrix",           0 },
-   { ON,  "GL_EXT_abgr",                       0 },
-   { ON,  "GL_EXT_bgra",                       0 },
+   { OFF, "GL_MESAX_texture_float",            F(ARB_texture_float) },
+   { OFF, "GL_ARB_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
+   { OFF, "GL_ARB_texture_non_power_of_two",   F(ARB_texture_non_power_of_two)},
+   { OFF, "GL_ARB_texture_rectangle",          F(NV_texture_rectangle) },
+   { ON,  "GL_ARB_transpose_matrix",           F(ARB_transpose_matrix) },
+   { OFF, "GL_ARB_vertex_buffer_object",       F(ARB_vertex_buffer_object) },
+   { OFF, "GL_ARB_vertex_program",             F(ARB_vertex_program) },
+   { OFF, "GL_ARB_vertex_shader",              F(ARB_vertex_shader) },
+   { ON,  "GL_ARB_window_pos",                 F(ARB_window_pos) },
+   { ON,  "GL_EXT_abgr",                       F(EXT_abgr) },
+   { ON,  "GL_EXT_bgra",                       F(EXT_bgra) },
    { OFF, "GL_EXT_blend_color",                F(EXT_blend_color) },
+   { OFF, "GL_EXT_blend_equation_separate",    F(EXT_blend_equation_separate) },
    { OFF, "GL_EXT_blend_func_separate",        F(EXT_blend_func_separate) },
    { OFF, "GL_EXT_blend_logic_op",             F(EXT_blend_logic_op) },
    { OFF, "GL_EXT_blend_minmax",               F(EXT_blend_minmax) },
    { OFF, "GL_EXT_blend_subtract",             F(EXT_blend_subtract) },
    { ON,  "GL_EXT_clip_volume_hint",           F(EXT_clip_volume_hint) },
-   { OFF, "GL_EXT_cull_vertex",                0 },
-   { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
+   { OFF, "GL_EXT_cull_vertex",                F(EXT_cull_vertex) },
    { ON,  "GL_EXT_compiled_vertex_array",      F(EXT_compiled_vertex_array) },
+   { OFF, "GL_EXT_convolution",                F(EXT_convolution) },
+   { ON,  "GL_EXT_copy_texture",               F(EXT_copy_texture) },
+   { OFF, "GL_EXT_depth_bounds_test",          F(EXT_depth_bounds_test) },
+   { ON,  "GL_EXT_draw_range_elements",        F(EXT_draw_range_elements) },
+   { OFF, "GL_EXT_framebuffer_object",         F(EXT_framebuffer_object) },
+   { OFF, "GL_EXT_framebuffer_blit",           F(EXT_framebuffer_blit) },
    { OFF, "GL_EXT_fog_coord",                  F(EXT_fog_coord) },
+   { OFF, "GL_EXT_gpu_program_parameters",     F(EXT_gpu_program_parameters) },
    { OFF, "GL_EXT_histogram",                  F(EXT_histogram) },
+   { OFF, "GL_EXT_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
+   { OFF, "GL_EXT_packed_depth_stencil",       F(EXT_packed_depth_stencil) },
    { ON,  "GL_EXT_packed_pixels",              F(EXT_packed_pixels) },
    { OFF, "GL_EXT_paletted_texture",           F(EXT_paletted_texture) },
+   { OFF, "GL_EXT_pixel_buffer_object",        F(EXT_pixel_buffer_object) },
    { OFF, "GL_EXT_point_parameters",           F(EXT_point_parameters) },
    { ON,  "GL_EXT_polygon_offset",             F(EXT_polygon_offset) },
    { ON,  "GL_EXT_rescale_normal",             F(EXT_rescale_normal) },
    { OFF, "GL_EXT_secondary_color",            F(EXT_secondary_color) },
+   { ON,  "GL_EXT_separate_specular_color",    F(EXT_separate_specular_color) },
+   { OFF, "GL_EXT_shadow_funcs",               F(EXT_shadow_funcs) },
    { OFF, "GL_EXT_shared_texture_palette",     F(EXT_shared_texture_palette) },
+   { OFF, "GL_EXT_stencil_two_side",           F(EXT_stencil_two_side) },
    { OFF, "GL_EXT_stencil_wrap",               F(EXT_stencil_wrap) },
+   { ON,  "GL_EXT_subtexture",                 F(EXT_subtexture) },
+   { ON,  "GL_EXT_texture",                    F(EXT_texture) },
    { ON,  "GL_EXT_texture3D",                  F(EXT_texture3D) },
    { OFF, "GL_EXT_texture_compression_s3tc",   F(EXT_texture_compression_s3tc) },
+   { ON,  "GL_EXT_texture_edge_clamp",         F(SGIS_texture_edge_clamp) },
    { OFF, "GL_EXT_texture_env_add",            F(EXT_texture_env_add) },
    { OFF, "GL_EXT_texture_env_combine",        F(EXT_texture_env_combine) },
    { OFF, "GL_EXT_texture_env_dot3",           F(EXT_texture_env_dot3) },
    { OFF, "GL_EXT_texture_filter_anisotropic", F(EXT_texture_filter_anisotropic) },
-   { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
    { OFF, "GL_EXT_texture_lod_bias",           F(EXT_texture_lod_bias) },
-   { ON,  "GL_EXT_vertex_array",               0 },
+   { OFF, "GL_EXT_texture_mirror_clamp",       F(EXT_texture_mirror_clamp) },
+   { ON,  "GL_EXT_texture_object",             F(EXT_texture_object) },
+   { OFF, "GL_EXT_texture_rectangle",          F(NV_texture_rectangle) },
+   { OFF, "GL_EXT_texture_sRGB",               F(EXT_texture_sRGB) },
+   { OFF, "GL_EXT_timer_query",                F(EXT_timer_query) },
+   { ON,  "GL_EXT_vertex_array",               F(EXT_vertex_array) },
    { OFF, "GL_EXT_vertex_array_set",           F(EXT_vertex_array_set) },
-   { OFF, "GL_HP_occlusion_test",              F(HP_occlusion_test) },
-   { OFF, "GL_INGR_blend_func_separate",       F(INGR_blend_func_separate) },
-   { OFF, "GL_MESA_packed_depth_stencil",      0 },
+   { OFF, "GL_3DFX_texture_compression_FXT1",  F(TDFX_texture_compression_FXT1) },
+   { OFF, "GL_APPLE_client_storage",           F(APPLE_client_storage) },
+   { ON,  "GL_APPLE_packed_pixels",            F(APPLE_packed_pixels) },
+   { OFF, "GL_APPLE_vertex_array_object",      F(APPLE_vertex_array_object) },
+   { OFF, "GL_ATI_blend_equation_separate",    F(EXT_blend_equation_separate) },
+   { OFF, "GL_ATI_texture_env_combine3",       F(ATI_texture_env_combine3)},
+   { OFF, "GL_ATI_texture_mirror_once",        F(ATI_texture_mirror_once)},
+   { OFF, "GL_ATI_fragment_shader",            F(ATI_fragment_shader)},
+   { OFF, "GL_ATI_separate_stencil",           F(ATI_separate_stencil)},
+   { OFF, "GL_IBM_multimode_draw_arrays",      F(IBM_multimode_draw_arrays) },
+   { ON,  "GL_IBM_rasterpos_clip",             F(IBM_rasterpos_clip) },
+   { OFF, "GL_IBM_texture_mirrored_repeat",    F(ARB_texture_mirrored_repeat)},
+   { OFF, "GL_INGR_blend_func_separate",       F(EXT_blend_func_separate) },
+   { OFF, "GL_MESA_pack_invert",               F(MESA_pack_invert) },
+   { OFF, "GL_MESA_packed_depth_stencil",      F(MESA_packed_depth_stencil) },
+   { OFF, "GL_MESA_program_debug",             F(MESA_program_debug) },
    { OFF, "GL_MESA_resize_buffers",            F(MESA_resize_buffers) },
-   { OFF, "GL_MESA_sprite_point",              F(MESA_sprite_point) },
-   { ON,  "GL_MESA_window_pos",                F(MESA_window_pos) },
+   { OFF, "GL_MESA_ycbcr_texture",             F(MESA_ycbcr_texture) },
+   { ON,  "GL_MESA_window_pos",                F(ARB_window_pos) },
    { OFF, "GL_NV_blend_square",                F(NV_blend_square) },
+   { OFF, "GL_NV_fragment_program",            F(NV_fragment_program) },
+   { ON,  "GL_NV_light_max_exponent",          F(NV_light_max_exponent) },
+   { OFF, "GL_NV_point_sprite",                F(NV_point_sprite) },
+   { OFF, "GL_NV_texture_rectangle",           F(NV_texture_rectangle) },
    { ON,  "GL_NV_texgen_reflection",           F(NV_texgen_reflection) },
+   { OFF, "GL_NV_vertex_program",              F(NV_vertex_program) },
+   { OFF, "GL_NV_vertex_program1_1",           F(NV_vertex_program1_1) },
+   { ON,  "GL_OES_read_format",                F(OES_read_format) },
    { OFF, "GL_SGI_color_matrix",               F(SGI_color_matrix) },
    { OFF, "GL_SGI_color_table",                F(SGI_color_table) },
+   { OFF, "GL_SGI_texture_color_table",        F(SGI_texture_color_table) },
    { OFF, "GL_SGIS_generate_mipmap",           F(SGIS_generate_mipmap) },
-   { OFF, "GL_SGIS_pixel_texture",             F(SGIS_pixel_texture) },
    { OFF, "GL_SGIS_texture_border_clamp",      F(ARB_texture_border_clamp) },
-   { OFF, "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
+   { ON,  "GL_SGIS_texture_edge_clamp",        F(SGIS_texture_edge_clamp) },
+   { ON,  "GL_SGIS_texture_lod",               F(SGIS_texture_lod) },
    { OFF, "GL_SGIX_depth_texture",             F(SGIX_depth_texture) },
-   { OFF, "GL_SGIX_pixel_texture",             F(SGIX_pixel_texture) },
    { OFF, "GL_SGIX_shadow",                    F(SGIX_shadow) },
    { OFF, "GL_SGIX_shadow_ambient",            F(SGIX_shadow_ambient) },
-   { OFF, "GL_3DFX_texture_compression_FXT1",  F(_3DFX_texture_compression_FXT1) }
+   { OFF, "GL_SUN_multi_draw_arrays",          F(EXT_multi_draw_arrays) },
+   { OFF, "GL_S3_s3tc",                        F(S3_s3tc) },
 };
 
 
 
-
-/*
+/**
  * Enable all extensions suitable for a software-only renderer.
  * This is a convenience function used by the XMesa, OSMesa, GGI drivers, etc.
  */
 void
 _mesa_enable_sw_extensions(GLcontext *ctx)
 {
-   const char *extensions[] = {
-      "GL_ARB_imaging",
-      "GL_ARB_multitexture",
-      "GL_ARB_texture_border_clamp",
-      "GL_ARB_texture_cube_map",
-      "GL_ARB_texture_env_add",
-      "GL_ARB_texture_env_combine",
-      "GL_ARB_texture_env_dot3",
-      "GL_EXT_blend_color",
-      "GL_EXT_blend_func_separate",
-      "GL_EXT_blend_logic_op",
-      "GL_EXT_blend_minmax",
-      "GL_EXT_blend_subtract",
-      "GL_EXT_convolution",
-      "GL_EXT_fog_coord",
-      "GL_EXT_histogram",
-      "GL_EXT_paletted_texture",
-      "GL_EXT_point_parameters",
-      "GL_EXT_secondary_color",
-      "GL_EXT_shared_texture_palette",
-      "GL_EXT_stencil_wrap",
-      "GL_EXT_texture_env_add",
-      "GL_EXT_texture_env_combine",
-      "GL_EXT_texture_env_dot3",
-      "GL_EXT_texture_lod_bias",
-      "GL_HP_occlusion_test",
-      "GL_INGR_blend_func_separate",
-      "GL_MESA_resize_buffers",
-      "GL_NV_blend_square",
-      "GL_NV_texgen_reflection",
-      "GL_SGI_color_matrix",
-      "GL_SGI_color_table",
-      "GL_SGIS_generate_mipmap",
-      "GL_SGIS_pixel_texture",
-      "GL_SGIS_texture_edge_clamp",
-      "GL_SGIS_texture_border_clamp",
-      "GL_SGIX_depth_texture",
-      "GL_SGIX_pixel_texture",
-      "GL_SGIX_shadow",
-      "GL_SGIX_shadow_ambient",
-      NULL
-   };
-   GLuint i;
-
-   for (i = 0; extensions[i]; i++) {
-      _mesa_enable_extension(ctx, extensions[i]);
-   }
+   ctx->Extensions.ARB_depth_texture = GL_TRUE;
+   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+#if FEATURE_ARB_fragment_program
+   ctx->Extensions.ARB_fragment_program = GL_TRUE;
+#endif
+#if FEATURE_ARB_fragment_shader
+   ctx->Extensions.ARB_fragment_shader = GL_TRUE;
+#endif
+   ctx->Extensions.ARB_half_float_pixel = GL_TRUE;
+   ctx->Extensions.ARB_imaging = GL_TRUE;
+   ctx->Extensions.ARB_multitexture = GL_TRUE;
+#if FEATURE_ARB_occlusion_query
+   ctx->Extensions.ARB_occlusion_query = GL_TRUE;
+#endif
+   ctx->Extensions.ARB_point_sprite = GL_TRUE;
+#if FEATURE_ARB_shader_objects
+   ctx->Extensions.ARB_shader_objects = GL_TRUE;
+#endif
+#if FEATURE_ARB_shading_language_100
+   ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
+#endif
+   ctx->Extensions.ARB_shadow = GL_TRUE;
+   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
+   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
+   /*ctx->Extensions.ARB_texture_float = GL_TRUE;*/
+   ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
+   ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
+#if FEATURE_ARB_vertex_program
+   ctx->Extensions.ARB_vertex_program = GL_TRUE;
+#endif
+#if FEATURE_ARB_vertex_shader
+   ctx->Extensions.ARB_vertex_shader = GL_TRUE;
+#endif
+#if FEATURE_ARB_vertex_buffer_object
+   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
+#endif
+   ctx->Extensions.APPLE_vertex_array_object = GL_TRUE;
+#if FEATURE_ATI_fragment_shader
+   ctx->Extensions.ATI_fragment_shader = GL_TRUE;
+#endif
+   ctx->Extensions.ATI_texture_env_combine3 = GL_TRUE;
+   ctx->Extensions.ATI_texture_mirror_once = GL_TRUE;
+   ctx->Extensions.ATI_separate_stencil = GL_TRUE;
+   ctx->Extensions.EXT_blend_color = GL_TRUE;
+   ctx->Extensions.EXT_blend_equation_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
+   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
+   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
+   ctx->Extensions.EXT_convolution = GL_TRUE;
+   ctx->Extensions.EXT_depth_bounds_test = GL_TRUE;
+   ctx->Extensions.EXT_fog_coord = GL_TRUE;
+#if FEATURE_EXT_framebuffer_object
+   ctx->Extensions.EXT_framebuffer_object = GL_TRUE;
+#endif
+#if FEATURE_EXT_framebuffer_blit
+   ctx->Extensions.EXT_framebuffer_blit = GL_TRUE;
+#endif
+   ctx->Extensions.EXT_histogram = GL_TRUE;
+   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
+   ctx->Extensions.EXT_packed_depth_stencil = GL_TRUE;
+   ctx->Extensions.EXT_paletted_texture = GL_TRUE;
+#if FEATURE_EXT_pixel_buffer_object
+   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
+#endif
+   ctx->Extensions.EXT_point_parameters = GL_TRUE;
+   ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
+   ctx->Extensions.EXT_secondary_color = GL_TRUE;
+   ctx->Extensions.EXT_shared_texture_palette = GL_TRUE;
+   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
+   ctx->Extensions.EXT_stencil_two_side = GL_FALSE; /* obsolete */
+   ctx->Extensions.EXT_texture_env_add = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_combine = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.EXT_texture_mirror_clamp = GL_TRUE;
+   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
+#if FEATURE_EXT_texture_sRGB
+   ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
+#endif
+   ctx->Extensions.IBM_multimode_draw_arrays = GL_TRUE;
+   ctx->Extensions.MESA_pack_invert = GL_TRUE;
+#if FEATURE_MESA_program_debug
+   ctx->Extensions.MESA_program_debug = GL_TRUE;
+#endif
+   ctx->Extensions.MESA_resize_buffers = GL_TRUE;
+   ctx->Extensions.MESA_ycbcr_texture = GL_TRUE;
+   ctx->Extensions.NV_blend_square = GL_TRUE;
+   /*ctx->Extensions.NV_light_max_exponent = GL_TRUE;*/
+   ctx->Extensions.NV_point_sprite = GL_TRUE;
+   ctx->Extensions.NV_texture_rectangle = GL_TRUE;
+   /*ctx->Extensions.NV_texgen_reflection = GL_TRUE;*/
+#if FEATURE_NV_vertex_program
+   ctx->Extensions.NV_vertex_program = GL_TRUE;
+   ctx->Extensions.NV_vertex_program1_1 = GL_TRUE;
+#endif
+#if FEATURE_NV_fragment_program
+   ctx->Extensions.NV_fragment_program = GL_TRUE;
+#endif
+   ctx->Extensions.SGI_color_matrix = GL_TRUE;
+   ctx->Extensions.SGI_color_table = GL_TRUE;
+   ctx->Extensions.SGI_texture_color_table = GL_TRUE;
+   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
+   ctx->Extensions.SGIS_texture_edge_clamp = GL_TRUE;
+   ctx->Extensions.SGIX_depth_texture = GL_TRUE;
+   ctx->Extensions.SGIX_shadow = GL_TRUE;
+   ctx->Extensions.SGIX_shadow_ambient = GL_TRUE;
+#if FEATURE_ARB_vertex_program || FEATURE_ARB_fragment_program
+   ctx->Extensions.EXT_gpu_program_parameters = GL_TRUE;
+#endif
 }
 
 
-/*
+/**
  * Enable GL_ARB_imaging and all the EXT extensions that are subsets of it.
  */
 void
 _mesa_enable_imaging_extensions(GLcontext *ctx)
 {
-   const char *extensions[] = {
-      "GL_ARB_imaging",
-      "GL_EXT_blend_color",
-      "GL_EXT_blend_minmax",
-      "GL_EXT_blend_subtract",
-      "GL_EXT_convolution",
-      "GL_EXT_histogram",
-      "GL_SGI_color_matrix",
-      "GL_SGI_color_table",
-      NULL
-   };
-   GLuint i;
+   ctx->Extensions.ARB_imaging = GL_TRUE;
+   ctx->Extensions.EXT_blend_color = GL_TRUE;
+   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
+   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
+   ctx->Extensions.EXT_convolution = GL_TRUE;
+   ctx->Extensions.EXT_histogram = GL_TRUE;
+   ctx->Extensions.SGI_color_matrix = GL_TRUE;
+   ctx->Extensions.SGI_color_table = GL_TRUE;
+}
 
-   for (i = 0; extensions[i]; i++) {
-      _mesa_enable_extension(ctx, extensions[i]);
-   }
+
+
+/**
+ * Enable all OpenGL 1.3 features and extensions.
+ * A convenience function to be called by drivers.
+ */
+void
+_mesa_enable_1_3_extensions(GLcontext *ctx)
+{
+   ctx->Extensions.ARB_multisample = GL_TRUE;
+   ctx->Extensions.ARB_multitexture = GL_TRUE;
+   ctx->Extensions.ARB_texture_border_clamp = GL_TRUE;
+   ctx->Extensions.ARB_texture_compression = GL_TRUE;
+   ctx->Extensions.ARB_texture_cube_map = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_combine = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_dot3 = GL_TRUE;
+   ctx->Extensions.EXT_texture_env_add = GL_TRUE;
+   /*ctx->Extensions.ARB_transpose_matrix = GL_TRUE;*/
 }
 
 
-/*
- * Add a new extenstion.  This would be called from a Mesa driver.
+
+/**
+ * Enable all OpenGL 1.4 features and extensions.
+ * A convenience function to be called by drivers.
  */
 void
-_mesa_add_extension( GLcontext *ctx,
-                     GLboolean enabled,
-                     const char *name,
-                     GLboolean *flag_ptr )
+_mesa_enable_1_4_extensions(GLcontext *ctx)
 {
-   /* We should never try to add an extension after
-    * _mesa_extensions_get_string() has been called!
-    */
-   assert(ctx->Extensions.ext_string == 0);
-
-   {
-      struct extension *t = MALLOC_STRUCT(extension);
-      t->enabled = enabled;
-      strncpy(t->name, name, MAX_EXT_NAMELEN);
-      t->name[MAX_EXT_NAMELEN] = 0;
-      t->flag = flag_ptr;
-      if (t->flag)
-         *t->flag = enabled;
-      insert_at_tail( ctx->Extensions.ext_list, t );
-   }
+   ctx->Extensions.ARB_depth_texture = GL_TRUE;
+   ctx->Extensions.ARB_shadow = GL_TRUE;
+   ctx->Extensions.ARB_texture_env_crossbar = GL_TRUE;
+   ctx->Extensions.ARB_texture_mirrored_repeat = GL_TRUE;
+   ctx->Extensions.ARB_window_pos = GL_TRUE;
+   ctx->Extensions.EXT_blend_color = GL_TRUE;
+   ctx->Extensions.EXT_blend_func_separate = GL_TRUE;
+   ctx->Extensions.EXT_blend_logic_op = GL_TRUE;
+   ctx->Extensions.EXT_blend_minmax = GL_TRUE;
+   ctx->Extensions.EXT_blend_subtract = GL_TRUE;
+   ctx->Extensions.EXT_fog_coord = GL_TRUE;
+   ctx->Extensions.EXT_multi_draw_arrays = GL_TRUE;
+   ctx->Extensions.EXT_point_parameters = GL_TRUE;
+   ctx->Extensions.EXT_secondary_color = GL_TRUE;
+   ctx->Extensions.EXT_stencil_wrap = GL_TRUE;
+   ctx->Extensions.EXT_texture_lod_bias = GL_TRUE;
+   ctx->Extensions.SGIS_generate_mipmap = GL_TRUE;
 }
 
 
-/*
+/**
+ * Enable all OpenGL 1.5 features and extensions.
+ * A convenience function to be called by drivers.
+ */
+void
+_mesa_enable_1_5_extensions(GLcontext *ctx)
+{
+   ctx->Extensions.ARB_occlusion_query = GL_TRUE;
+   ctx->Extensions.ARB_vertex_buffer_object = GL_TRUE;
+   ctx->Extensions.EXT_shadow_funcs = GL_TRUE;
+}
+
+
+/**
+ * Enable all OpenGL 2.0 features and extensions.
+ * A convenience function to be called by drivers.
+ */
+void
+_mesa_enable_2_0_extensions(GLcontext *ctx)
+{
+   ctx->Extensions.ARB_draw_buffers = GL_TRUE;
+#if FEATURE_ARB_fragment_shader
+   ctx->Extensions.ARB_fragment_shader = GL_TRUE;
+#endif
+   ctx->Extensions.ARB_point_sprite = GL_TRUE;
+   ctx->Extensions.ARB_texture_non_power_of_two = GL_TRUE;
+#if FEATURE_ARB_shader_objects
+   ctx->Extensions.ARB_shader_objects = GL_TRUE;
+#endif
+#if FEATURE_ARB_shading_language_100
+   ctx->Extensions.ARB_shading_language_100 = GL_TRUE;
+#endif
+   ctx->Extensions.EXT_stencil_two_side = GL_FALSE; /* obsolete */
+#if FEATURE_ARB_vertex_shader
+   ctx->Extensions.ARB_vertex_shader = GL_TRUE;
+#endif
+}
+
+
+/**
+ * Enable all OpenGL 2.1 features and extensions.
+ * A convenience function to be called by drivers.
+ */
+void
+_mesa_enable_2_1_extensions(GLcontext *ctx)
+{
+#if FEATURE_EXT_pixel_buffer_object
+   ctx->Extensions.EXT_pixel_buffer_object = GL_TRUE;
+#endif
+#if FEATURE_EXT_texture_sRGB
+   ctx->Extensions.EXT_texture_sRGB = GL_TRUE;
+#endif
+#ifdef FEATURE_ARB_shading_language_120
+   ctx->Extensions.ARB_shading_language_120 = GL_TRUE;
+#endif
+}
+
+
+
+/**
  * Either enable or disable the named extension.
  */
 static void
-set_extension( GLcontext *ctx, const char *name, GLint state )
+set_extension( GLcontext *ctx, const char *name, GLboolean state )
 {
-   /* XXX we should assert that ext_string is null.  We should never be
-    * enabling/disabling extensions after _mesa_extensions_get_string()
-    * has been called!
-    */
-   struct extension *i;
-   foreach( i, ctx->Extensions.ext_list )
-      if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0)
-        break;
-
-   if (i == ctx->Extensions.ext_list) {
-      /* this is an error.  Drivers should never try to enable/disable
-       * an extension which is unknown to Mesa or wasn't added by calling
-       * _mesa_add_extension().
-       */
+   GLboolean *base = (GLboolean *) &ctx->Extensions;
+   GLuint i;
+
+   if (ctx->Extensions.String) {
+      /* The string was already queried - can't change it now! */
+      _mesa_problem(ctx, "Trying to enable/disable extension after glGetString(GL_EXTENSIONS): %s", name);
       return;
    }
 
-   if (i->flag)
-      *(i->flag) = state;
-   i->enabled = state;
+   for (i = 0 ; i < Elements(default_extensions) ; i++) {
+      if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
+         if (default_extensions[i].flag_offset) {
+            GLboolean *enabled = base + default_extensions[i].flag_offset;
+            *enabled = state;
+         }
+         return;
+      }
+   }
+   _mesa_problem(ctx, "Trying to enable unknown extension: %s", name);
 }
 
 
-
+/**
+ * Enable the named extension.
+ * Typically called by drivers.
+ */
 void
 _mesa_enable_extension( GLcontext *ctx, const char *name )
 {
-   if (ctx->Extensions.ext_string == 0)
-      set_extension( ctx, name, 1 );
+   set_extension(ctx, name, GL_TRUE);
 }
 
 
+/**
+ * Disable the named extension.
+ * XXX is this really needed???
+ */
 void
 _mesa_disable_extension( GLcontext *ctx, const char *name )
 {
-   if (ctx->Extensions.ext_string == 0)
-      set_extension( ctx, name, 0 );
+   set_extension(ctx, name, GL_FALSE);
 }
 
 
-/*
+/**
  * Test if the named extension is enabled in this context.
  */
 GLboolean
-_mesa_extension_is_enabled( GLcontext *ctx, const char *name)
+_mesa_extension_is_enabled( GLcontext *ctx, const char *name )
 {
-   struct extension *i;
-   foreach( i, ctx->Extensions.ext_list )
-      if (strncmp(i->name, name, MAX_EXT_NAMELEN) == 0) {
-         if (i->enabled)
+   const GLboolean *base = (const GLboolean *) &ctx->Extensions;
+   GLuint i;
+
+   for (i = 0 ; i < Elements(default_extensions) ; i++) {
+      if (_mesa_strcmp(default_extensions[i].name, name) == 0) {
+         if (!default_extensions[i].flag_offset)
             return GL_TRUE;
-         else
-            return GL_FALSE;
+         return *(base + default_extensions[i].flag_offset);
       }
-
+   }
    return GL_FALSE;
 }
 
 
+/**
+ * Run through the default_extensions array above and set the
+ * ctx->Extensions.ARB/EXT_* flags accordingly.
+ * To be called during context initialization.
+ */
 void
-_mesa_extensions_dtr( GLcontext *ctx )
+_mesa_init_extensions( GLcontext *ctx )
 {
-   struct extension *i, *nexti;
-
-   if (ctx->Extensions.ext_string) {
-      FREE( ctx->Extensions.ext_string );
-      ctx->Extensions.ext_string = 0;
-   }
+   GLboolean *base = (GLboolean *) &ctx->Extensions;
+   GLuint i;
 
-   if (ctx->Extensions.ext_list) {
-      foreach_s( i, nexti, ctx->Extensions.ext_list ) {
-        remove_from_list( i );
-        FREE( i );
+   for (i = 0 ; i < Elements(default_extensions) ; i++) {
+      if (default_extensions[i].enabled &&
+          default_extensions[i].flag_offset) {
+         *(base + default_extensions[i].flag_offset) = GL_TRUE;
       }
-
-      FREE(ctx->Extensions.ext_list);
-      ctx->Extensions.ext_list = 0;
    }
 }
 
 
-void
-_mesa_extensions_ctr( GLcontext *ctx )
+/**
+ * Construct the GL_EXTENSIONS string.  Called the first time that
+ * glGetString(GL_EXTENSIONS) is called.
+ */
+GLubyte *
+_mesa_make_extension_string( GLcontext *ctx )
 {
+   const GLboolean *base = (const GLboolean *) &ctx->Extensions;
+   GLuint extStrLen = 0;
+   GLubyte *s;
    GLuint i;
-   GLboolean *base = (GLboolean *)&ctx->Extensions;
-
-   ctx->Extensions.ext_string = NULL;
-   ctx->Extensions.ext_list = MALLOC_STRUCT(extension);
-   make_empty_list( ctx->Extensions.ext_list );
 
+   /* first, compute length of the extension string */
    for (i = 0 ; i < Elements(default_extensions) ; i++) {
-      GLboolean *ptr = NULL;
-
-      if (default_extensions[i].flag_offset)
-        ptr = base + default_extensions[i].flag_offset;
-
-      (void) _mesa_add_extension( ctx,
-                                  default_extensions[i].enabled,
-                                  default_extensions[i].name,
-                                  ptr);
+      if (!default_extensions[i].flag_offset ||
+          *(base + default_extensions[i].flag_offset)) {
+         extStrLen += (GLuint)_mesa_strlen(default_extensions[i].name) + 1;
+      }
    }
-}
-
+   s = (GLubyte *) _mesa_malloc(extStrLen);
 
-const char *
-_mesa_extensions_get_string( GLcontext *ctx )
-{
-   if (ctx->Extensions.ext_string == 0)
-   {
-      struct extension *i;
-      char *str;
-      GLuint len = 0;
-      foreach (i, ctx->Extensions.ext_list)
-        if (i->enabled)
-           len += strlen(i->name) + 1;
-
-      if (len == 0)
-        return "";
-
-      str = (char *)MALLOC(len * sizeof(char));
-      ctx->Extensions.ext_string = str;
-
-      foreach (i, ctx->Extensions.ext_list)
-        if (i->enabled) {
-           strcpy(str, i->name);
-           str += strlen(str);
-           *str++ = ' ';
-        }
-
-      *(str-1) = 0;
+   /* second, build the extension string */
+   extStrLen = 0;
+   for (i = 0 ; i < Elements(default_extensions) ; i++) {
+      if (!default_extensions[i].flag_offset ||
+          *(base + default_extensions[i].flag_offset)) {
+         GLuint len = (GLuint)_mesa_strlen(default_extensions[i].name);
+         _mesa_memcpy(s + extStrLen, default_extensions[i].name, len);
+         extStrLen += len;
+         s[extStrLen] = (GLubyte) ' ';
+         extStrLen++;
+      }
    }
+   ASSERT(extStrLen > 0);
+
+   s[extStrLen - 1] = 0;
 
-   return ctx->Extensions.ext_string;
+   return s;
 }