diff options
Diffstat (limited to 'src/mesa/swrast/s_context.h')
| -rw-r--r-- | src/mesa/swrast/s_context.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h index cdd6fa5048d..6e8d080704d 100644 --- a/src/mesa/swrast/s_context.h +++ b/src/mesa/swrast/s_context.h @@ -289,6 +289,34 @@ swrast_render_finish(GLcontext *ctx) /* + * 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) +#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 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) +#define FixedCeil(X) (((X) + FIXED_ONE - FIXED_EPSILON) & FIXED_INT_MASK) +#define FixedFloor(X) ((X) & FIXED_INT_MASK) +#define FixedToFloat(X) ((X) * (1.0F / FIXED_SCALE)) +#define PosFloatToFixed(X) FloatToFixed(X) +#define SignedFloatToFixed(X) FloatToFixed(X) + + + +/* * XXX these macros are just bandages for now in order to make * CHAN_BITS==32 compile cleanly. * These should probably go elsewhere at some point. |