Mesa (master): mesa: add assertion and update comment in _mesa_format_image_size()

[Brian Paul]

Module: Mesa
Branch: master
Commit: 7bfbd88d2cc4c7e7c1c2fe02b0d223f4a3ea8db2
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7bfbd88d2cc4c7e7c1c2fe02b0d223f4a3ea8db2

Author: Brian Paul <brianp at vmware.com>
Date:   Wed Nov 24 10:24:17 2010 -0700

mesa: add assertion and update comment in _mesa_format_image_size()

---

 src/mesa/main/formats.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 88a04e8..f689d99 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1057,11 +1057,12 @@ _mesa_format_image_size(gl_format format, GLsizei width,
    const struct gl_format_info *info = _mesa_get_format_info(format);
    /* Strictly speaking, a conditional isn't needed here */
    if (info->BlockWidth > 1 || info->BlockHeight > 1) {
-      /* compressed format */
+      /* compressed format (2D only for now) */
       const GLuint bw = info->BlockWidth, bh = info->BlockHeight;
       const GLuint wblocks = (width + bw - 1) / bw;
       const GLuint hblocks = (height + bh - 1) / bh;
       const GLuint sz = wblocks * hblocks * info->BytesPerBlock;
+      assert(depth == 1);
       return sz;
    }
    else {