icd: add common utility functions

1 files changed, 56 insertions, 0 deletions

diff --git a/icd/common/icd-utils.h b/icd/common/icd-utils.h
new file mode 100644
index 00000000..c6008520
--- /dev/null
+++ b/icd/common/icd-utils.h
@@ -0,0 +1,56 @@
+/*
+ * XGL
+ *
+ * Copyright (C) 2014 LunarG, Inc.
+ *
+ * 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
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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.
+ */
+
+#ifndef ICD_UTILS_H
+#define ICD_UTILS_H
+
+#include <assert.h>
+#include "icd.h"
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+
+#define STATIC_ASSERT(expr) do {            \
+    (void) sizeof(char[1 - 2 * !(expr)]);   \
+} while (0)
+
+/**
+ * Return true if val is power of two, or zero.
+ */
+static inline bool u_is_pow2(unsigned int val)
+{
+    return ((val & (val - 1)) == 0);
+}
+
+static inline unsigned int u_align(unsigned int val, unsigned alignment)
+{
+    assert(alignment && u_is_pow2(alignment));
+    return (val + alignment - 1) & ~(alignment - 1);
+}
+
+static inline unsigned int u_minify(unsigned int val, unsigned level)
+{
+    return (val >> level) ? val >> level : 1;
+}
+
+#endif /* ICD_UTILS_H */