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-rw-r--r--mesalib/src/mesa/main/macros.h38
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
+
/*@}*/