Mesa (master): mesa: add another special/ optimized case in _mesa_unpack_depth_span()

[Brian Paul]

Module: Mesa
Branch: master
Commit: ac1ff1b9fe19077e53ff4cd14a1b083232c8bf72
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=ac1ff1b9fe19077e53ff4cd14a1b083232c8bf72

Author: Brian Paul <brianp at vmware.com>
Date:   Tue Apr  7 17:31:14 2009 -0600

mesa: add another special/optimized case in _mesa_unpack_depth_span()

---

 src/mesa/main/image.c |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c
index 5cb110f..ddae456 100644
--- a/src/mesa/main/image.c
+++ b/src/mesa/main/image.c
@@ -4546,6 +4546,17 @@ _mesa_unpack_depth_span( const GLcontext *ctx, GLuint n,
          }
          return;
       }
+      if (srcType == GL_UNSIGNED_INT_24_8
+          && dstType == GL_UNSIGNED_INT
+          && depthMax == 0xffffff) {
+         const GLuint *src = (const GLuint *) source;
+         GLuint *dst = (GLuint *) dest;
+         GLuint i;
+         for (i = 0; i < n; i++) {
+            dst[i] = src[i] >> 8;
+         }
+         return;
+      }
       /* XXX may want to add additional cases here someday */
    }