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fully parameterize the macros for fixed-point arithmetic

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This commit is contained in:
Brian Paul
2004-02-08 00:37:32 +00:00
parent 875f763c9f
commit 08a45d4d4f
1 changed files with 7 additions and 13 deletions
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src/mesa/main/mtypes.h
+7 -13
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@@ -108,21 +108,15 @@ typedef int GLfixed;
/*
* Fixed point arithmetic macros
*/
#ifdef FIXED_14
#define FIXED_ONE 0x00004000
#define FIXED_HALF 0x00002000
#define FIXED_FRAC_MASK 0x00003FFF
#define FIXED_SCALE 16384.0f
#define FIXED_SHIFT 14
#else
#define FIXED_ONE 0x00000800
#define FIXED_HALF 0x00000400
#define FIXED_FRAC_MASK 0x000007FF
#define FIXED_SCALE 2048.0f
#define FIXED_SHIFT 11
#endif
#define FIXED_FRAC_BITS 11
#define FIXED_SHIFT FIXED_FRAC_BITS
#define FIXED_ONE (1 << FIXED_SHIFT)
#define FIXED_HALF (1 << (FIXED_SHIFT-1))
#define FIXED_FRAC_MASK (FIXED_ONE - 1)
#define FIXED_INT_MASK (~FIXED_FRAC_MASK)
#define FIXED_EPSILON 1
#define FIXED_SCALE ((float) FIXED_ONE)
#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))
#define IntToFixed(I) ((I) << FIXED_SHIFT)
#define FixedToInt(X) ((X) >> FIXED_SHIFT)