#define _HAVE_FULL_GL 1
#endif
-#define FEATURE_accum _HAVE_FULL_GL
-#define FEATURE_attrib_stack _HAVE_FULL_GL
-#define FEATURE_colortable _HAVE_FULL_GL
-#define FEATURE_convolve _HAVE_FULL_GL
-#define FEATURE_dispatch _HAVE_FULL_GL
-#define FEATURE_dlist _HAVE_FULL_GL
-#define FEATURE_draw_read_buffer _HAVE_FULL_GL
-#define FEATURE_drawpix _HAVE_FULL_GL
-#define FEATURE_evaluators _HAVE_FULL_GL
-#define FEATURE_feedback _HAVE_FULL_GL
-#define FEATURE_fixedpt 0
-#define FEATURE_histogram _HAVE_FULL_GL
-#define FEATURE_pixel_transfer _HAVE_FULL_GL
-#define FEATURE_point_size_array 0
-#define FEATURE_texgen _HAVE_FULL_GL
-#define FEATURE_texture_fxt1 _HAVE_FULL_GL
-#define FEATURE_texture_s3tc _HAVE_FULL_GL
-#define FEATURE_userclip _HAVE_FULL_GL
-#define FEATURE_vertex_array_byte 0
-#define FEATURE_windowpos _HAVE_FULL_GL
-#define FEATURE_es2_glsl 0
-
-#define FEATURE_ARB_occlusion_query _HAVE_FULL_GL
-#define FEATURE_ARB_fragment_program _HAVE_FULL_GL
-#define FEATURE_ARB_framebuffer_object _HAVE_FULL_GL
-#define FEATURE_ARB_map_buffer_range _HAVE_FULL_GL
-#define FEATURE_ARB_pixel_buffer_object _HAVE_FULL_GL
-#define FEATURE_ARB_vertex_buffer_object _HAVE_FULL_GL
-#define FEATURE_ARB_vertex_program _HAVE_FULL_GL
-#define FEATURE_ARB_vertex_shader _HAVE_FULL_GL
-#define FEATURE_ARB_fragment_shader _HAVE_FULL_GL
-#define FEATURE_ARB_shader_objects (FEATURE_ARB_vertex_shader || FEATURE_ARB_fragment_shader)
-#define FEATURE_ARB_shading_language_100 FEATURE_ARB_shader_objects
-#define FEATURE_ARB_shading_language_120 FEATURE_ARB_shader_objects
-
-#define FEATURE_EXT_framebuffer_blit _HAVE_FULL_GL
-#define FEATURE_EXT_framebuffer_object _HAVE_FULL_GL
-#define FEATURE_EXT_pixel_buffer_object _HAVE_FULL_GL
-#define FEATURE_EXT_texture_sRGB _HAVE_FULL_GL
-#define FEATURE_EXT_timer_query _HAVE_FULL_GL
-#define FEATURE_ATI_fragment_shader _HAVE_FULL_GL
-#define FEATURE_NV_fence _HAVE_FULL_GL
-#define FEATURE_NV_fragment_program _HAVE_FULL_GL
-#define FEATURE_NV_vertex_program _HAVE_FULL_GL
+/* assert that a feature is disabled and should never be used */
+#define ASSERT_NO_FEATURE() ASSERT(0)
+/**
+ * A feature can be anything. But most of them share certain characteristics.
+ *
+ * When a feature defines driver entries, they can be initialized by
+ * _MESA_INIT_<FEATURE>_FUNCTIONS
+ *
+ * When a feature defines vtxfmt entries, they can be initialized and
+ * installed by
+ * _MESA_INIT_<FEATURE>_VTXFMT
+ * _mesa_install_<feature>_vtxfmt
+ *
+ * When a feature defines dispatch entries, they are initialized by
+ * _mesa_init_<feature>_dispatch
+ *
+ * When a feature has states, they are initialized and freed by
+ * _mesa_init_<feature>
+ * _mesa_free_<feature>_data
+ *
+ * Except for states, the others compile to no-op when a feature is disabled.
+ *
+ * The GLAPIENTRYs and helper functions defined by a feature should also
+ * compile to no-op when it is disabled. But to save typings and to catch
+ * bugs, some of them may be unavailable, or compile to ASSERT_NO_FEATURE()
+ * when the feature is disabled.
+ *
+ * A feature following the conventions may be used without knowing if it is
+ * enabled or not.
+ */
+
+#ifndef FEATURE_ES1
+#define FEATURE_ES1 0
+#endif
+#ifndef FEATURE_ES2
+#define FEATURE_ES2 0
+#endif
+
+#define FEATURE_ES (FEATURE_ES1 || FEATURE_ES2)
+
+#ifndef FEATURE_GL
+#define FEATURE_GL !FEATURE_ES
+#endif
+
+#ifdef IN_DRI_DRIVER
+#define FEATURE_remap_table 1
+#else
+#define FEATURE_remap_table 0
+#endif
+
+#define FEATURE_dispatch 1
+#define FEATURE_texgen 1
+#define FEATURE_userclip 1
+
+#define FEATURE_accum FEATURE_GL
+#define FEATURE_arrayelt FEATURE_GL
+#define FEATURE_attrib_stack FEATURE_GL
+/* this disables vtxfmt, api_loopback, and api_noop completely */
+#define FEATURE_beginend FEATURE_GL
+#define FEATURE_colortable FEATURE_GL
+#define FEATURE_convolve FEATURE_GL
+#define FEATURE_dlist (FEATURE_GL && FEATURE_arrayelt && FEATURE_beginend)
+#define FEATURE_draw_read_buffer FEATURE_GL
+#define FEATURE_drawpix FEATURE_GL
+#define FEATURE_evaluators FEATURE_GL
+#define FEATURE_feedback FEATURE_GL
+#define FEATURE_histogram FEATURE_GL
+#define FEATURE_pixel_transfer FEATURE_GL
+#define FEATURE_queryobj FEATURE_GL
+#define FEATURE_rastpos FEATURE_GL
+#define FEATURE_texture_fxt1 FEATURE_GL
+#define FEATURE_texture_s3tc FEATURE_GL
+
+#define FEATURE_extra_context_init FEATURE_ES
+#define FEATURE_fixedpt FEATURE_ES
+#define FEATURE_point_size_array FEATURE_ES
+#define FEATURE_vertex_array_byte FEATURE_ES
+
+#define FEATURE_es2_glsl FEATURE_ES2
+
+#define FEATURE_ARB_fragment_program 1
+#define FEATURE_ARB_vertex_program 1
+#define FEATURE_ARB_vertex_shader 1
+#define FEATURE_ARB_fragment_shader 1
+#define FEATURE_ARB_shader_objects (FEATURE_ARB_vertex_shader || FEATURE_ARB_fragment_shader)
+#define FEATURE_ARB_shading_language_100 FEATURE_ARB_shader_objects
+#define FEATURE_ARB_shading_language_120 FEATURE_ARB_shader_objects
+
+#define FEATURE_ARB_framebuffer_object (FEATURE_GL && FEATURE_EXT_framebuffer_object)
+#define FEATURE_ARB_map_buffer_range FEATURE_GL
+#define FEATURE_ARB_pixel_buffer_object (FEATURE_GL && FEATURE_EXT_pixel_buffer_object)
+#define FEATURE_ARB_sync FEATURE_GL
+#define FEATURE_ARB_vertex_buffer_object 1
+
+#define FEATURE_EXT_framebuffer_blit FEATURE_GL
+#define FEATURE_EXT_framebuffer_object 1
+#define FEATURE_EXT_pixel_buffer_object 1
+#define FEATURE_EXT_texture_sRGB FEATURE_GL
+#define FEATURE_EXT_transform_feedback FEATURE_GL
+
+#define FEATURE_APPLE_object_purgeable FEATURE_GL
+#define FEATURE_ATI_fragment_shader FEATURE_GL
+#define FEATURE_NV_fence FEATURE_GL
+#define FEATURE_NV_fragment_program FEATURE_GL
+#define FEATURE_NV_vertex_program FEATURE_GL
+
+#define FEATURE_OES_EGL_image 1
+#define FEATURE_OES_draw_texture FEATURE_ES1
+#define FEATURE_OES_framebuffer_object FEATURE_ES
+#define FEATURE_OES_mapbuffer FEATURE_ES
#endif /* FEATURES_H */
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