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-rw-r--r--src/mesa/main/mfeatures.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/src/mesa/main/mfeatures.h b/src/mesa/main/mfeatures.h
index e23cdb1f42..6318934c6b 100644
--- a/src/mesa/main/mfeatures.h
+++ b/src/mesa/main/mfeatures.h
@@ -36,6 +36,38 @@
#define _HAVE_FULL_GL 1
#endif
+/* 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.
+ */
+
#define FEATURE_accum _HAVE_FULL_GL
#define FEATURE_attrib_stack _HAVE_FULL_GL
#define FEATURE_colortable _HAVE_FULL_GL