diff options
Diffstat (limited to 'mesalib/src/mesa/main/macros.h')
| -rw-r--r-- | mesalib/src/mesa/main/macros.h | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/mesalib/src/mesa/main/macros.h b/mesalib/src/mesa/main/macros.h index a8624574d..b2ec0ba9b 100644 --- a/mesalib/src/mesa/main/macros.h +++ b/mesalib/src/mesa/main/macros.h @@ -127,6 +127,44 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256]; #define CLAMPED_FLOAT_TO_USHORT(us, f) \ us = ( (GLushort) IROUND( (f) * 65535.0F) ) +#define UNCLAMPED_FLOAT_TO_SHORT(s, f) \ + s = ( (GLshort) IROUND( CLAMP((f), -1.0F, 1.0F) * 32767.0F) ) + +/*** + *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255] + *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255] + ***/ +#if defined(USE_IEEE) && !defined(DEBUG) +#define IEEE_0996 0x3f7f0000 /* 0.996 or so */ +/* This function/macro is sensitive to precision. Test very carefully + * if you change it! + */ +#define UNCLAMPED_FLOAT_TO_UBYTE(UB, F) \ + do { \ + fi_type __tmp; \ + __tmp.f = (F); \ + if (__tmp.i < 0) \ + UB = (GLubyte) 0; \ + else if (__tmp.i >= IEEE_0996) \ + UB = (GLubyte) 255; \ + else { \ + __tmp.f = __tmp.f * (255.0F/256.0F) + 32768.0F; \ + UB = (GLubyte) __tmp.i; \ + } \ + } while (0) +#define CLAMPED_FLOAT_TO_UBYTE(UB, F) \ + do { \ + fi_type __tmp; \ + __tmp.f = (F) * (255.0F/256.0F) + 32768.0F; \ + UB = (GLubyte) __tmp.i; \ + } while (0) +#else +#define UNCLAMPED_FLOAT_TO_UBYTE(ub, f) \ + ub = ((GLubyte) IROUND(CLAMP((f), 0.0F, 1.0F) * 255.0F)) +#define CLAMPED_FLOAT_TO_UBYTE(ub, f) \ + ub = ((GLubyte) IROUND((f) * 255.0F)) +#endif + /*@}*/ |