From: Brian Paul <brianp@vmware.com>
Date: Mon, 28 Nov 2011 18:08:01 +0000 (-0700)
Subject: mesa: access pixels as GLushort in unpack_SL8()
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=25c8a112abf4bbf271c6972f7539ca2a1c7683bd;p=mesa.git

mesa: access pixels as GLushort in unpack_SL8()

Per the format comments and the texstore code, use a GLushort to access the
pixel.  The code was OK as-is on little endian machines.
---

diff --git a/src/mesa/main/format_unpack.c b/src/mesa/main/format_unpack.c
index 0ab6940144b..0411f5fb740 100644
--- a/src/mesa/main/format_unpack.c
+++ b/src/mesa/main/format_unpack.c
@@ -749,13 +749,13 @@ unpack_SL8(const void *src, GLfloat dst[][4], GLuint n)
 static void
 unpack_SLA8(const void *src, GLfloat dst[][4], GLuint n)
 {
-   const GLubyte *s = (const GLubyte *) src;
+   const GLushort *s = (const GLushort *) src;
    GLuint i;
    for (i = 0; i < n; i++) {
       dst[i][RCOMP] =
       dst[i][GCOMP] =
-      dst[i][BCOMP] = nonlinear_to_linear(s[i*2+0]);
-      dst[i][ACOMP] = UBYTE_TO_FLOAT(s[i*2+1]); /* linear! */
+      dst[i][BCOMP] = nonlinear_to_linear(s[i] & 0xff);
+      dst[i][ACOMP] = UBYTE_TO_FLOAT(s[i] >> 8); /* linear! */
    }
 }