-/* $Id: colormac.h,v 1.10 2001/07/16 15:54:23 brianp Exp $ */
+/**
+ * \file colormac.h
+ * Color-related macros
+ */
/*
* Mesa 3-D graphics library
- * Version: 3.5
+ * Version: 5.1
*
- * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
-/*
- * Color-related macros
- */
-
#ifndef COLORMAC_H
#define COLORMAC_H
-#include "glheader.h"
+#include "imports.h"
#include "config.h"
#include "macros.h"
-#include "mmath.h"
-/* Do not reference mtypes.h from this file.
- */
+/** \def BYTE_TO_CHAN
+ * Convert from GLbyte to GLchan */
+
+/** \def UBYTE_TO_CHAN
+ * Convert from GLubyte to GLchan */
+
+/** \def SHORT_TO_CHAN
+ * Convert from GLshort to GLchan */
+
+/** \def USHORT_TO_CHAN
+ * Convert from GLushort to GLchan */
+
+/** \def INT_TO_CHAN
+ * Convert from GLint to GLchan */
+
+/** \def UINT_TO_CHAN
+ * Convert from GLuint to GLchan */
+
+/** \def CHAN_TO_UBYTE
+ * Convert from GLchan to GLubyte */
+
+/** \def CHAN_TO_FLOAT
+ * Convert from GLchan to GLfloat */
+
+/** \def CLAMPED_FLOAT_TO_CHAN
+ * Convert from GLclampf to GLchan */
+
+/** \def UNCLAMPED_FLOAT_TO_CHAN
+ * Convert from GLfloat to GLchan */
+
+/** \def COPY_CHAN4
+ * Copy a GLchan[4] array */
+
+/** \def CHAN_PRODUCT
+ * Scaled product (usually approximated) between two GLchan arguments */
+
#if CHAN_BITS == 8
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (GLchan) (b))
#define CHAN_PRODUCT(a, b) ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8))
-
#elif CHAN_BITS == 16
#define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (((GLchan) (b)) * 516))
#define CHAN_TO_UBYTE(c) ((c) >> 8)
#define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
-#define CLAMPED_FLOAT_TO_CHAN(c, f) \
- c = ((GLchan) IROUND((f) * CHAN_MAXF))
-#define UNCLAMPED_FLOAT_TO_CHAN(c, f) \
- c = ( (GLchan) IROUND( CLAMP(f, 0.0, 1.0) * CHAN_MAXF) )
+#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f)
+#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f)
#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
#define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535))
-
#elif CHAN_BITS == 32
/* XXX floating-point color channels not fully thought-out */
#endif
-
-/*
+/**
* Convert 3 channels at once.
+ *
+ * \param dst pointer to destination GLchan[3] array.
+ * \param f pointer to source GLfloat[3] array.
+ *
+ * \sa #UNCLAMPED_FLOAT_TO_CHAN.
*/
#define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f) \
do { \
} while (0)
-/*
+/**
* Convert 4 channels at once.
+ *
+ * \param dst pointer to destination GLchan[4] array.
+ * \param f pointer to source GLfloat[4] array.
+ *
+ * \sa #UNCLAMPED_FLOAT_TO_CHAN.
*/
#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \
do { \
} while (0)
+
+/**
+ * \name Generic color packing macros
+ *
+ * \todo We may move these into texutil.h at some point.
+ */
+/*@{*/
+
+#define PACK_COLOR_8888( a, b, c, d ) \
+ (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
+
+#define PACK_COLOR_888( a, b, c ) \
+ (((a) << 16) | ((b) << 8) | (c))
+
+#define PACK_COLOR_565( a, b, c ) \
+ ((((a) & 0xf8) << 8) | (((b) & 0xfc) << 3) | (((c) & 0xf8) >> 3))
+
+#define PACK_COLOR_1555( a, b, c, d ) \
+ ((((b) & 0xf8) << 7) | (((c) & 0xf8) << 2) | (((d) & 0xf8) >> 3) | \
+ ((a) ? 0x8000 : 0))
+
+#define PACK_COLOR_4444( a, b, c, d ) \
+ ((((a) & 0xf0) << 8) | (((b) & 0xf0) << 4) | ((c) & 0xf0) | ((d) >> 4))
+
+#define PACK_COLOR_88( a, b ) \
+ (((a) << 8) | (b))
+
+#define PACK_COLOR_332( a, b, c ) \
+ (((a) & 0xe0) | (((b) & 0xe0) >> 3) | (((c) & 0xc0) >> 6))
+
+
+#ifdef MESA_BIG_ENDIAN
+
+#define PACK_COLOR_8888_LE( a, b, c, d ) PACK_COLOR_8888( d, c, b, a )
+
+#define PACK_COLOR_565_LE( a, b, c ) \
+ (((a) & 0xf8) | (((b) & 0xe0) >> 5) | (((b) & 0x1c) << 11) | \
+ (((c) & 0xf8) << 5))
+
+#define PACK_COLOR_1555_LE( a, b, c, d ) \
+ ((((b) & 0xf8) >> 1) | (((c) & 0xc0) >> 6) | (((c) & 0x38) << 10) | \
+ (((d) & 0xf8) << 5) | ((a) ? 0x80 : 0))
+
+#define PACK_COLOR_4444_LE( a, b, c, d ) PACK_COLOR_4444( c, d, a, b )
+
+#define PACK_COLOR_88_LE( a, b ) PACK_COLOR_88( b, a )
+
+#else /* little endian */
+
+#define PACK_COLOR_8888_LE( a, b, c, d ) PACK_COLOR_8888( a, b, c, d )
+
+#define PACK_COLOR_565_LE( a, b, c ) PACK_COLOR_565( a, b, c )
+
+#define PACK_COLOR_1555_LE( a, b, c, d ) PACK_COLOR_1555( a, b, c, d )
+
+#define PACK_COLOR_4444_LE( a, b, c, d ) PACK_COLOR_4444( a, b, c, d )
+
+#define PACK_COLOR_88_LE( a, b ) PACK_COLOR_88( a, b )
+
+#endif /* endianness */
+
+/*@}*/
+
+
#endif /* COLORMAC_H */