From 607b61a994d8dca150d5611b18db9b55755f73b4 Mon Sep 17 00:00:00 2001
From: Michal Krol <mjkrol@gmail.org>
Date: Tue, 4 Apr 2006 10:11:12 +0000
Subject: Bit set.

---
 src/mesa/main/bitset.h | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 src/mesa/main/bitset.h

(limited to 'src')

diff --git a/src/mesa/main/bitset.h b/src/mesa/main/bitset.h
new file mode 100644
index 0000000000..1fd548bfda
--- /dev/null
+++ b/src/mesa/main/bitset.h
@@ -0,0 +1,72 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5
+ *
+ * Copyright (C) 2006  Brian Paul   All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+/**
+ * \file bitset.h
+ * \brief Bitset of arbitrary size definitions.
+ * \author Michal Krol
+ */
+
+#define BITSET_WORD GLuint
+#define BITSET_WORDBITS (sizeof (BITSET_WORD) * 8)
+
+/* bitset declarations
+ */
+#define BITSET_DECLARE(name, size) \
+   BITSET_WORD name[((size) + BITSET_WORDBITS - 1) / BITSET_WORDBITS]
+
+/* bitset operations
+ */
+#define BITSET_COPY(x, y) _mesa_memcpy( (x), (y), sizeof (x) )
+#define BITSET_EQUAL(x, y) (_mesa_memcmp( (x), (y), sizeof (x) ) == 0)
+#define BITSET_ZERO(x) _mesa_memset( (x), 0, sizeof (x) )
+#define BITSET_ONES(x) _mesa_memset( (x), 0xff, sizeof (x) )
+
+#define BITSET_BITWORD(b) ((b) / BITSET_WORDBITS)
+#define BITSET_BIT(b) (1 << ((b) % BITSET_WORDBITS))
+
+/* single bit operations
+ */
+#define BITSET_TEST(x, b) ((x)[BITSET_BITWORD(b)] & BITSET_BIT(b))
+#define BITSET_SET(x, b) ((x)[BITSET_BITWORD(b)] |= BITSET_BIT(b))
+#define BITSET_CLEAR(x, b) ((x)[BITSET_BITWORD(b)] &= ~BITSET_BIT(b))
+
+#define BITSET_MASK(b) ((b) == BITSET_WORDBITS ? ~0 : BITSET_BIT(b) - 1)
+#define BITSET_RANGE(b, e) (BITSET_MASK((e) + 1) & ~BITSET_MASK(b))
+
+/* bit range operations
+ */
+#define BITSET_TEST_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] & BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_TEST_RANGE: bit range crosses word boundary"), 0))
+#define BITSET_SET_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] |= BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_SET_RANGE: bit range crosses word boundary"), 0))
+#define BITSET_CLEAR_RANGE(x, b, e) \
+   (BITSET_BITWORD(b) == BITSET_BITWORD(e) ? \
+   ((x)[BITSET_BITWORD(b)] &= ~BITSET_RANGE(b, e)) : \
+   (assert (!"BITSET_CLEAR_RANGE: bit range crosses word boundary"), 0))
+
-- 
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