added 3dengfx into the repo, probably not the correct version for this

[summerhack] / src / 3dengfx / src / gfx / color_bits.h

diff --git a/src/3dengfx/src/gfx/color_bits.h b/src/3dengfx/src/gfx/color_bits.h
new file mode 100644 (file)
index 0000000..ec15999
--- /dev/null
+++ b/src/3dengfx/src/gfx/color_bits.h
@@ -0,0 +1,103 @@
+/*
+Copyright 2004 John Tsiombikas <nuclear@siggraph.org>
+
+This file is part of the graphics core library.
+
+The graphics core library is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+The graphics core library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with the graphics core library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/* color bit shift and mask values for color packing/unpacking
+ * in a cross-endianess manner.
+ *
+ * author: John Tsiombikas 2004
+ */
+#ifndef _COLOR_BITS_H_
+#define _COLOR_BITS_H_
+
+#include "common/types.h"
+#include "common/byteorder.h"
+
+/* 32bit color shift values */
+#ifdef LITTLE_ENDIAN
+#define ALPHA_SHIFT32  24
+#define RED_SHIFT32            16
+#define GREEN_SHIFT32  8
+#define BLUE_SHIFT32   0
+#else  /* BIG_ENDIAN */
+#define ALPHA_SHIFT32  0
+#define RED_SHIFT32            8
+#define GREEN_SHIFT32  16
+#define BLUE_SHIFT32   24
+#endif /* LITTLE_ENDIAN */
+
+/* 32bit color mask values */
+#define ALPHA_MASK32   0xff
+#define RED_MASK32             0xff
+#define GREEN_MASK32   0xff
+#define BLUE_MASK32            0xff
+
+/* 16bit color shift values */
+#ifdef LITTLE_ENDIAN
+#define RED_SHIFT16            11
+#define GREEN_SHIFT16  5
+#define BLUE_SHIFT16   0
+#else  /* BIG_ENDIAN */
+#define RED_SHIFT16            0
+#define GREEN_SHIFT16  5
+#define BLUE_SHIFT16   11
+#endif /* LITTLE_ENDIAN */
+
+/* 16bit color mask values */
+#define RED_MASK16             0x1f
+#define GREEN_MASK16   0x3f
+#define BLUE_MASK16            0x1f
+
+/* 15bit color shift values */
+#ifdef LITTLE_ENDIAN
+#define RED_SHIFT15            10
+#define GREEN_SHIFT15  5
+#define BLUE_SHIFT15   0
+#else  /* BIG_ENDIAN */
+#define RED_SHIFT15            0
+#define GREEN_SHIFT15  5
+#define BLUE_SHIFT15   10
+#endif /* LITTLE_ENDIAN */
+
+/* 15bit color mask values */
+#define RED_MASK15             0x1f
+#define GREEN_MASK15   0x1f
+#define BLUE_MASK15            0x1f
+
+
+/* color packing macros */
+#define PACK_COLOR32(a,r,g,b) \
+       ((((unsigned long)(a) & ALPHA_MASK32) << ALPHA_SHIFT32) | \
+       (((unsigned long)(r) & RED_MASK32) << RED_SHIFT32) | \
+       (((unsigned long)(g) & GREEN_MASK32) << GREEN_SHIFT32) | \
+       (((unsigned long)(b) & BLUE_MASK32) << BLUE_SHIFT32))
+
+#define PACK_COLOR24(r,g,b)            PACK_COLOR32(0xff,r,g,b)
+
+#define PACK_COLOR16(r,g,b) \
+       ((((unsigned short)(r) & RED_MASK16) << RED_SHIFT16) | \
+       (((unsigned short)(g) & GREEN_MASK16) << GREEN_SHIFT16) | \
+       (((unsigned short)(b) & BLUE_MASK16) << BLUE_SHIFT16))
+
+#define PACK_COLOR15(r,g,b) \
+       ((((unsigned short)(r) & RED_MASK15) << RED_SHIFT15) | \
+       (((unsigned short)(g) & GREEN_MASK15) << GREEN_SHIFT15) | \
+       (((unsigned short)(b) & BLUE_MASK15) << BLUE_SHIFT15))
+
+#endif /* _COLOR_BITS_H_ */