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| author | Vinson Lee <vlee@vmware.com> | 2010-07-09 15:06:19 -0700 |
|---|---|---|
| committer | Vinson Lee <vlee@vmware.com> | 2010-07-09 15:06:19 -0700 |
| commit | 343b38a692a43f091117e05287748d9b2f093aee (patch) | |
| tree | 886efd59d93be497c76c5906d39310eb739fa1eb /src/mesa/main/macros.h | |
| parent | 347c00c46e9ecf858a8c21abf58a706b658b5b37 (diff) | |
| download | external_mesa3d-343b38a692a43f091117e05287748d9b2f093aee.zip external_mesa3d-343b38a692a43f091117e05287748d9b2f093aee.tar.gz external_mesa3d-343b38a692a43f091117e05287748d9b2f093aee.tar.bz2 | |
mesa: Move [UN]CLAMPED_FLOAT_TO_UBYTE from imports.h to macros.h.
The other similar integer/float conversion macros are in macros.h.
Diffstat (limited to 'src/mesa/main/macros.h')
| -rw-r--r-- | src/mesa/main/macros.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/mesa/main/macros.h b/src/mesa/main/macros.h index 40e17e5..b2ec0ba 100644 --- a/src/mesa/main/macros.h +++ b/src/mesa/main/macros.h @@ -130,6 +130,41 @@ extern GLfloat _mesa_ubyte_to_float_color_tab[256]; #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 + /*@}*/ |