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added FixedToDouble() macro

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This commit is contained in:
Brian Paul 2004-02-17 04:24:52 +00:00
parent 84b4a3a087
commit c2f6d6d092
1 changed files with 4 additions and 0 deletions
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4
src/mesa/main/mtypes.h
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@ -108,7 +108,9 @@ typedef int GLfixed;
/*
* Fixed point arithmetic macros
*/
#ifndef FIXED_FRAC_BITS
#define FIXED_FRAC_BITS 11
#endif
#define FIXED_SHIFT FIXED_FRAC_BITS
#define FIXED_ONE (1 << FIXED_SHIFT)
@ -117,7 +119,9 @@ typedef int GLfixed;
#define FIXED_INT_MASK (~FIXED_FRAC_MASK)
#define FIXED_EPSILON 1
#define FIXED_SCALE ((float) FIXED_ONE)
#define FIXED_DBL_SCALE ((double) FIXED_ONE)
#define FloatToFixed(X) (IROUND((X) * FIXED_SCALE))
#define FixedToDouble(X) ((X) * (1.0 / FIXED_DBL_SCALE))
#define IntToFixed(I) ((I) << FIXED_SHIFT)
#define FixedToInt(X) ((X) >> FIXED_SHIFT)
#define FixedToUns(X) (((unsigned int)(X)) >> FIXED_SHIFT)