From: Marek Olšák <maraeo@gmail.com>
Date: Thu, 19 Aug 2010 20:18:40 +0000 (+0200)
Subject: r300g: do not use fastfill with 16-bit zbuffers
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=06991d87bedaaba5dde65027caa6fb49325b754e;p=mesa.git

r300g: do not use fastfill with 16-bit zbuffers

To my knowledge, there is no way to flush zmask and thus write the clear
value.

This fixes zbuffer reads, among other things.
---

diff --git a/src/gallium/drivers/r300/r300_hyperz.c b/src/gallium/drivers/r300/r300_hyperz.c
index a471b7353bf..b2526d6e414 100644
--- a/src/gallium/drivers/r300/r300_hyperz.c
+++ b/src/gallium/drivers/r300/r300_hyperz.c
@@ -357,6 +357,10 @@ void r300_zmask_alloc_block(struct r300_context *r300, struct r300_surface *surf
         tex->desc.b.b.target != PIPE_TEXTURE_2D)
         return;
 
+    /* Cannot flush zmask of 16-bit zbuffers. */
+    if (util_format_get_blocksizebits(tex->desc.b.b.format) == 16)
+        return;
+
     if (tex->zmask_mem[level])
         return;