From 2371033bbaf6e7477bfa893654a0467a084f335b Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 2 Jul 2004 16:39:59 +0000
Subject: document some assumptions made about compressed texture tile size

---
 src/mesa/main/teximage.c | 6 ++++++
 1 file changed, 6 insertions(+)

(limited to 'src/mesa/main')

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
index d11b6e4609..b1f526c175 100644
--- a/src/mesa/main/teximage.c
+++ b/src/mesa/main/teximage.c
@@ -2833,6 +2833,9 @@ compressed_texture_error_check(GLcontext *ctx, GLint dimensions,
 
 /**
  * Error checking for glCompressedTexSubImage[123]D().
+ * \warning  There are some bad assumptions here about the size of compressed
+ *           texture tiles (multiple of 4) used to test the validity of the
+ *           offset and size parameters.
  * \return error code or GL_NO_ERROR.
  */
 static GLenum
@@ -2890,6 +2893,9 @@ compressed_subtexture_error_check(GLcontext *ctx, GLint dimensions,
    if (level < 0 || level >= maxLevels)
       return GL_INVALID_VALUE;
 
+   /* XXX these tests are specific to the compressed format.
+    * this code should be generalized in some way.
+    */
    if ((xoffset & 3) != 0 || (yoffset & 3) != 0)
       return GL_INVALID_VALUE;
 
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