From: Brian Paul <brianp@vmware.com>
Date: Sat, 4 Dec 2010 00:07:16 +0000 (-0700)
Subject: st/mesa: new comment about updating state vars
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=6c33e820d5fe740ac4735d8bab864177dd1b2f14;p=mesa.git

st/mesa: new comment about updating state vars
---

diff --git a/src/mesa/state_tracker/st_atom_constbuf.c b/src/mesa/state_tracker/st_atom_constbuf.c
index 8d1dc792bc8..f1d08a3e166 100644
--- a/src/mesa/state_tracker/st_atom_constbuf.c
+++ b/src/mesa/state_tracker/st_atom_constbuf.c
@@ -66,6 +66,11 @@ void st_upload_constants( struct st_context *st,
    if (params && params->NumParameters) {
       const uint paramBytes = params->NumParameters * sizeof(GLfloat) * 4;
 
+      /* Update the constants which come from fixed-function state, such as
+       * transformation matrices, fog factors, etc.  The rest of the values in
+       * the parameters list are explicitly set by the user with glUniform,
+       * glProgramParameter(), etc.
+       */
       _mesa_load_state_parameters(st->ctx, params);
 
       /* We always need to get a new buffer, to keep the drivers simple and