-/* $Id: colormac.h,v 1.3 2000/11/16 21:05:34 keithw Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 3.5
*
- * Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2008 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"),
* 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.
+ * THE AUTHORS OR COPYRIGHT HOLDERS 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 "glheader.h"
#include "config.h"
#include "macros.h"
-#include "mmath.h"
-/* Do not reference types.h from this file.
- */
-/*
- * Integer / float conversion for colors, normals, etc.
+/**
+ * Convert four float values in [0,1] to ubytes in [0,255] with clamping.
*/
+static inline void
+_mesa_unclamped_float_rgba_to_ubyte(GLubyte dst[4], const GLfloat src[4])
+{
+ int i;
+ for (i = 0; i < 4; i++)
+ UNCLAMPED_FLOAT_TO_UBYTE(dst[i], src[i]);
+}
-#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
+/**
+ * \name Generic color packing macros. All inputs should be GLubytes.
+ */
+/*@{*/
-#define FLOAT_TO_CHAN(f) (f)
-#define DOUBLE_TO_CHAN(f) ((GLfloat) (f))
-#define UNCLAMPED_FLOAT_TO_CHAN(f) (f)
-#define UNCLAMPED_DOUBLE_TO_CHAN(f) ((GLfloat) (f))
+#define PACK_COLOR_8888( X, Y, Z, W ) \
+ (((X) << 24) | ((Y) << 16) | ((Z) << 8) | (W))
-#else
+#define PACK_COLOR_565( X, Y, Z ) \
+ ((((X) & 0xf8) << 8) | (((Y) & 0xfc) << 3) | (((Z) & 0xf8) >> 3))
-#define FLOAT_TO_CHAN(f) ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
-#define DOUBLE_TO_CHAN(f) ( (GLchan) FloatToInt((f) * CHAN_MAXF + 0.5F) )
+#define PACK_COLOR_1555( A, B, G, R ) \
+ ((((B) & 0xf8) << 7) | (((G) & 0xf8) << 2) | (((R) & 0xf8) >> 3) | \
+ (((A) & 0x80) << 8))
-#define UNCLAMPED_FLOAT_TO_CHAN(f) \
- ( (GLchan) FloatToInt( CLAMP(f, 0.0, 1.0) * CHAN_MAXF + 0.5F) )
+#define PACK_COLOR_4444( R, G, B, A ) \
+ ((((R) & 0xf0) << 8) | (((G) & 0xf0) << 4) | ((B) & 0xf0) | ((A) >> 4))
-#define UNCLAMPED_DOUBLE_TO_CHAN(f) \
- ( (GLchan) FloatToInt( CLAMP(f, 0.0, 1.0) * CHAN_MAXF + 0.5F) )
+#define PACK_COLOR_88( L, A ) \
+ (((L) << 8) | (A))
-#endif
+/*@}*/
#endif /* COLORMAC_H */
projects / mesa.git / blobdiff