nir: Improve the comment on num_inputs and friends

This doesn't fix the problem that no one knows what any of these mean
half the time but it at least makes them better documented to hopefully
make people's expectations more accurate.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6524>

diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h
index 6195a66fd25e92e69e59877e89ff340983e46ead..e6edb72ecf207ab18d900981e7ae49ef989d5d55 100644 (file)
--- a/src/compiler/nir/nir.h
+++ b/src/compiler/nir/nir.h
@@ -3322,8 +3322,9 @@ typedef struct nir_shader {
    struct exec_list functions; /** < list of nir_function */
 
    /**
-    * the highest index a load_input_*, load_uniform_*, etc. intrinsic can
-    * access plus one
+    * The size of the variable space for load_input_*, load_uniform_*, etc.
+    * intrinsics.  This is in back-end specific units which is likely one of
+    * bytes, dwords, or vec4s depending on context and back-end.
     */
    unsigned num_inputs, num_uniforms, num_outputs;