From 3486f6f31b8cdb01e480cfbd8814c1e4222d26b0 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Mon, 6 Jan 2014 12:50:43 -0700
Subject: mesa: implement missing glGet(GL_RGBA_SIGNED_COMPONENTS_EXT) query

This is part of the GL_EXT_packed_float extension.

Bugzilla: http://bugs.freedesktop.org/show_bug.cgi?id=73096
Cc: 10.0 <mesa-stable@lists.freedesktop.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
---
 src/mesa/main/formats.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/mesa/main/formats.c')

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 07d2a72406b..eb2a07ea5f6 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1966,6 +1966,25 @@ _mesa_is_format_unsigned(gl_format format)
 }
 
 
+/**
+ * Does the given format store signed values?
+ */
+GLboolean
+_mesa_is_format_signed(gl_format format)
+{
+   if (format == MESA_FORMAT_R11_G11_B10_FLOAT) {
+      /* this packed float format only stores unsigned values */
+      return GL_FALSE;
+   }
+   else {
+      const struct gl_format_info *info = _mesa_get_format_info(format);
+      return (info->DataType == GL_SIGNED_NORMALIZED ||
+              info->DataType == GL_INT ||
+              info->DataType == GL_FLOAT);
+   }
+}
+
+
 /**
  * Return color encoding for given format.
  * \return GL_LINEAR or GL_SRGB
-- 
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