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55 | pj | 1 | /* $Id: colormac.h,v 1.1 2003-02-28 11:41:58 pj Exp $ */ |
2 | |||
3 | /* |
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4 | * Mesa 3-D graphics library |
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5 | * Version: 4.1 |
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6 | * |
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7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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8 | * |
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9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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10 | * copy of this software and associated documentation files (the "Software"), |
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11 | * to deal in the Software without restriction, including without limitation |
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12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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13 | * and/or sell copies of the Software, and to permit persons to whom the |
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14 | * Software is furnished to do so, subject to the following conditions: |
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15 | * |
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16 | * The above copyright notice and this permission notice shall be included |
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17 | * in all copies or substantial portions of the Software. |
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18 | * |
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19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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25 | */ |
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26 | |||
27 | |||
28 | |||
29 | /* |
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30 | * Color-related macros |
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31 | */ |
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32 | |||
33 | #ifndef COLORMAC_H |
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34 | #define COLORMAC_H |
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35 | |||
36 | |||
37 | #include "glheader.h" |
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38 | #include "config.h" |
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39 | #include "macros.h" |
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40 | #include "mmath.h" |
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41 | /* Do not reference mtypes.h from this file. |
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42 | */ |
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43 | |||
44 | |||
45 | #if CHAN_BITS == 8 |
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46 | |||
47 | #define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (GLchan) (b)) |
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48 | #define UBYTE_TO_CHAN(b) (b) |
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49 | #define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) ((s) >> 7)) |
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50 | #define USHORT_TO_CHAN(s) ((GLchan) ((s) >> 8)) |
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51 | #define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 23)) |
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52 | #define UINT_TO_CHAN(i) ((GLchan) ((i) >> 24)) |
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53 | |||
54 | #define CHAN_TO_UBYTE(c) (c) |
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55 | #define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c) |
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56 | |||
57 | #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f) |
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58 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f) |
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59 | |||
60 | #define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC) |
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61 | |||
62 | #define CHAN_PRODUCT(a, b) ((GLubyte) (((GLint)(a) * ((GLint)(b) + 1)) >> 8)) |
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63 | |||
64 | |||
65 | #elif CHAN_BITS == 16 |
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66 | |||
67 | #define BYTE_TO_CHAN(b) ((b) < 0 ? 0 : (((GLchan) (b)) * 516)) |
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68 | #define UBYTE_TO_CHAN(b) ((((GLchan) (b)) << 8) | ((GLchan) (b))) |
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69 | #define SHORT_TO_CHAN(s) ((s) < 0 ? 0 : (GLchan) (s)) |
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70 | #define USHORT_TO_CHAN(s) (s) |
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71 | #define INT_TO_CHAN(i) ((i) < 0 ? 0 : (GLchan) ((i) >> 15)) |
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72 | #define UINT_TO_CHAN(i) ((GLchan) ((i) >> 16)) |
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73 | |||
74 | #define CHAN_TO_UBYTE(c) ((c) >> 8) |
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75 | #define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF))) |
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76 | |||
77 | #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f) |
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78 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f) |
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79 | |||
80 | #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) |
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81 | |||
82 | #define CHAN_PRODUCT(a, b) ((GLchan) ((((GLuint) (a)) * ((GLuint) (b))) / 65535)) |
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83 | |||
84 | |||
85 | #elif CHAN_BITS == 32 |
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86 | |||
87 | /* XXX floating-point color channels not fully thought-out */ |
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88 | #define BYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 127.0F))) |
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89 | #define UBYTE_TO_CHAN(b) ((GLfloat) ((b) * (1.0F / 255.0F))) |
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90 | #define SHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 32767.0F))) |
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91 | #define USHORT_TO_CHAN(s) ((GLfloat) ((s) * (1.0F / 65535.0F))) |
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92 | #define INT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 2147483647.0F))) |
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93 | #define UINT_TO_CHAN(i) ((GLfloat) ((i) * (1.0F / 4294967295.0F))) |
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94 | |||
95 | #define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c) |
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96 | #define CHAN_TO_FLOAT(c) (c) |
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97 | |||
98 | #define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f) |
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99 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f) |
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100 | |||
101 | #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) |
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102 | |||
103 | #define CHAN_PRODUCT(a, b) ((a) * (b)) |
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104 | |||
105 | #else |
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106 | |||
107 | #error unexpected CHAN_BITS size |
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108 | |||
109 | #endif |
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110 | |||
111 | |||
112 | |||
113 | /* |
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114 | * Convert 3 channels at once. |
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115 | */ |
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116 | #define UNCLAMPED_FLOAT_TO_RGB_CHAN(dst, f) \ |
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117 | do { \ |
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118 | UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \ |
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119 | UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \ |
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120 | UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \ |
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121 | } while (0) |
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122 | |||
123 | |||
124 | /* |
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125 | * Convert 4 channels at once. |
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126 | */ |
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127 | #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \ |
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128 | do { \ |
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129 | UNCLAMPED_FLOAT_TO_CHAN(dst[0], f[0]); \ |
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130 | UNCLAMPED_FLOAT_TO_CHAN(dst[1], f[1]); \ |
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131 | UNCLAMPED_FLOAT_TO_CHAN(dst[2], f[2]); \ |
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132 | UNCLAMPED_FLOAT_TO_CHAN(dst[3], f[3]); \ |
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133 | } while (0) |
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134 | |||
135 | |||
136 | #endif /* COLORMAC_H */ |