From 389d50baff8234fdf4d7bcddeb09658d7d17012d Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Fri, 27 Feb 2009 22:26:18 -0700 Subject: mesa: move GLfixed type and related macros to swrast module Fixed point is only used in swrast and sw-based drivers. --- src/mesa/swrast/s_context.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'src/mesa/swrast/s_context.h') diff --git a/src/mesa/swrast/s_context.h b/src/mesa/swrast/s_context.h index cdd6fa5048..6e8d080704 100644 --- a/src/mesa/swrast/s_context.h +++ b/src/mesa/swrast/s_context.h @@ -288,6 +288,34 @@ 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. -- cgit v1.2.3