New colormac.h file for color-related macros.

Lot's of clean-up in macros.h and mmath.h

1 files changed, 187 insertions, 0 deletions

diff --git a/src/mesa/main/colormac.h b/src/mesa/main/colormac.h
new file mode 100644
index 0000000000..5d125e2725
--- /dev/null
+++ b/src/mesa/main/colormac.h
@@ -0,0 +1,187 @@
+/* $Id: colormac.h,v 1.1 2000/10/28 20:41:13 brianp Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ *
+ * Copyright (C) 1999-2000  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.
+ */
+
+
+
+/*
+ * Color-related macros
+ */
+
+#ifndef COLORMAC_H
+#define COLORMAC_H
+
+
+#include "glheader.h"
+#include "config.h"
+#include "macros.h"
+#include "mmath.h"
+
+
+
+/*
+ * Integer / float conversion for colors, normals, etc.
+ */
+
+#define BYTE_TO_UBYTE(b)   (b < 0 ? 0 : (GLubyte) b)
+#define SHORT_TO_UBYTE(s)  (s < 0 ? 0 : (GLubyte) (s >> 7))
+#define USHORT_TO_UBYTE(s)              (GLubyte) (s >> 8)
+#define INT_TO_UBYTE(i)    (i < 0 ? 0 : (GLubyte) (i >> 23))
+#define UINT_TO_UBYTE(i)                (GLubyte) (i >> 24)
+
+/* Convert GLfloat in [0.0,1.0] to GLubyte in [0,255] */
+#define FLOAT_TO_UBYTE(X)	((GLubyte) (GLint) (((X)) * 255.0F))
+
+
+/* Convert GLbyte in [-128,127] to GLfloat in [-1.0,1.0] */
+#define BYTE_TO_FLOAT(B)	((2.0F * (B) + 1.0F) * (1.0F/255.0F))
+
+/* Convert GLfloat in [-1.0,1.0] to GLbyte in [-128,127] */
+#define FLOAT_TO_BYTE(X)	( (((GLint) (255.0F * (X))) - 1) / 2 )
+
+
+/* Convert GLushort in [0,65536] to GLfloat in [0.0,1.0] */
+#define USHORT_TO_FLOAT(S)	((GLfloat) (S) * (1.0F / 65535.0F))
+
+/* Convert GLfloat in [0.0,1.0] to GLushort in [0,65536] */
+#define FLOAT_TO_USHORT(X)	((GLushort) (GLint) ((X) * 65535.0F))
+
+
+/* Convert GLshort in [-32768,32767] to GLfloat in [-1.0,1.0] */
+#define SHORT_TO_FLOAT(S)	((2.0F * (S) + 1.0F) * (1.0F/65535.0F))
+
+/* Convert GLfloat in [0.0,1.0] to GLshort in [-32768,32767] */
+#define FLOAT_TO_SHORT(X)	( (((GLint) (65535.0F * (X))) - 1) / 2 )
+
+
+/* Convert GLuint in [0,4294967295] to GLfloat in [0.0,1.0] */
+#define UINT_TO_FLOAT(U)	((GLfloat) (U) * (1.0F / 4294967295.0F))
+
+/* Convert GLfloat in [0.0,1.0] to GLuint in [0,4294967295] */
+#define FLOAT_TO_UINT(X)	((GLuint) ((X) * 4294967295.0))
+
+
+/* Convert GLint in [-2147483648,2147483647] to GLfloat in [-1.0,1.0] */
+#define INT_TO_FLOAT(I)		((2.0F * (I) + 1.0F) * (1.0F/4294967294.0F))
+
+/* Convert GLfloat in [-1.0,1.0] to GLint in [-2147483648,2147483647] */
+/* causes overflow:
+#define FLOAT_TO_INT(X)		( (((GLint) (4294967294.0F * (X))) - 1) / 2 )
+*/
+/* a close approximation: */
+#define FLOAT_TO_INT(X)		( (GLint) (2147483647.0 * (X)) )
+
+
+
+#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_FLOAT(c)  UBYTE_TO_FLOAT(c)
+
+#define FLOAT_COLOR_TO_CHAN(c, f) FLOAT_COLOR_TO_UBYTE_COLOR(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) | (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_FLOAT(c)  ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
+
+#define FLOAT_COLOR_TO_CHAN(c, f) \
+	c = ((GLchan) FloatToInt(CLAMP(f, 0.0F, 1.0F) * CHAN_MAXF + 0.5F))
+
+#define COPY_CHAN4(DST, SRC)  COPY_4V(DST, SRC)
+
+#define CHAN_PRODUCT(a, b)  ( (GLchan) ((((GLint) (a)) * ((GLint) (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_FLOAT(c)  (c)
+
+#define FLOAT_COLOR_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
+
+
+#define FLOAT_RGB_TO_CHAN_RGB(dst, f)		\
+do {						\
+   FLOAT_COLOR_TO_CHAN(dst[0], f[0]);		\
+   FLOAT_COLOR_TO_CHAN(dst[1], f[1]);		\
+   FLOAT_COLOR_TO_CHAN(dst[2], f[2]);		\
+} while(0)
+
+#define FLOAT_RGBA_TO_CHAN_RGBA(c, f)		\
+do {						\
+   FLOAT_COLOR_TO_CHAN(c[0], f[0]);		\
+   FLOAT_COLOR_TO_CHAN(c[1], f[1]);		\
+   FLOAT_COLOR_TO_CHAN(c[2], f[2]);		\
+   FLOAT_COLOR_TO_CHAN(c[3], f[3]);		\
+} while(0)
+
+
+#if CHAN_BITS == 32
+
+#define FLOAT_TO_CHAN(f)   (f)
+#define DOUBLE_TO_CHAN(f)  ((GLfloat) (f))
+
+#else
+
+#define FLOAT_TO_CHAN(f)   ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
+#define DOUBLE_TO_CHAN(f)  ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
+
+#endif
+
+
+#endif /* COLORMAC_H */