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+/*
+ * Mesa 3-D graphics library
+ * Version: 6.1
+ *
+ * Copyright (C) 1999-2004 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"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+/**
+ * \file colormac.h
+ * Color-related macros
+ */
+
+
+#ifndef COLORMAC_H
+#define COLORMAC_H
+
+
+#include "imports.h"
+#include "config.h"
+#include "macros.h"
+
+
+/** \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 UBYTE_TO_CHAN(b) (b)
+#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) ((s) >> 7))
+#define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8))
+#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 23))
+#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 24))
+
+#define CHAN_TO_UBYTE(c) (c)
+#define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c)
+
+#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f)
+#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f)
+
+#define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC)
+
+#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 UBYTE_TO_CHAN(b) ((((GLchan) (b)) << 8) | ((GLchan) (b)))
+#define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) (s))
+#define USHORT_TO_CHAN(s) (s)
+#define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 15))
+#define UINT_TO_CHAN(i) ((GLchan) ((i) >> 16))
+
+#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) 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 */
+#define BYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 127.0F)))
+#define UBYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 255.0F)))
+#define SHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 32767.0F)))
+#define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F)))
+#define INT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 2147483647.0F)))
+#define UINT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 4294967295.0F)))
+
+#define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c)
+#define CHAN_TO_FLOAT(c) (c)
+
+#define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
+#define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
+
+#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
+
+#define CHAN_PRODUCT(a, b) ((a) * (b))
+
+#else
+
+#error unexpected CHAN_BITS size
+
+#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 { \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
+} 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 { \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \
+ UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]); \
+} while (0)
+
+
+
+/**
+ * \name Generic color packing macros. All inputs should be GLubytes.
+ *
+ * \todo We may move these into texstore.h at some point.
+ */
+/*@{*/
+
+#define PACK_COLOR_8888( R, G, B, A ) \
+ (((R) << 24) | ((G) << 16) | ((B) << 8) | (A))
+
+#define PACK_COLOR_8888_REV( R, G, B, A ) \
+ (((A) << 24) | ((B) << 16) | ((G) << 8) | (R))
+
+#define PACK_COLOR_888( R, G, B ) \
+ (((R) << 16) | ((G) << 8) | (B))
+
+#define PACK_COLOR_565( R, G, B ) \
+ ((((R) & 0xf8) << 8) | (((G) & 0xfc) << 3) | (((B) & 0xf8) >> 3))
+
+#define PACK_COLOR_565_REV( R, G, B ) \
+ (((R) & 0xf8) | ((G) & 0xe0) >> 5 | (((G) & 0x1c) << 11) | (((B) & 0xf8) << 5))
+
+#define PACK_COLOR_1555( A, B, G, R ) \
+ ((((B) & 0xf8) << 7) | (((G) & 0xf8) << 2) | (((R) & 0xf8) >> 3) | \
+ ((A) ? 0x8000 : 0))
+
+#define PACK_COLOR_1555_REV( A, B, G, R ) \
+ ((((B) & 0xf8) >> 1) | (((G) & 0xc0) >> 6) | (((G) & 0x38) << 10) | (((R) & 0xf8) << 5) | \
+ ((A) ? 0x80 : 0))
+
+#define PACK_COLOR_4444( R, G, B, A ) \
+ ((((R) & 0xf0) << 8) | (((G) & 0xf0) << 4) | ((B) & 0xf0) | ((A) >> 4))
+
+#define PACK_COLOR_4444_REV( R, G, B, A ) \
+ ((((B) & 0xf0) << 8) | (((A) & 0xf0) << 4) | ((R) & 0xf0) | ((G) >> 4))
+
+#define PACK_COLOR_88( L, A ) \
+ (((L) << 8) | (A))
+
+#define PACK_COLOR_88_REV( L, A ) \
+ (((A) << 8) | (L))
+
+#define PACK_COLOR_332( R, G, B ) \
+ (((R) & 0xe0) | (((G) & 0xe0) >> 3) | (((B) & 0xc0) >> 6))
+
+#define PACK_COLOR_233( B, G, R ) \
+ (((B) & 0xc0) | (((G) & 0xe0) >> 2) | (((R) & 0xe0) >> 5))
+
+/*@}*/
+
+
+#endif /* COLORMAC_H */