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| 5564 | serge | 1 | /* |
| 2 | * Mesa 3-D graphics library |
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| 3 | * |
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| 4 | * Copyright (C) 2011 VMware, Inc. All Rights Reserved. |
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| 5 | * |
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| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 7 | * copy of this software and associated documentation files (the "Software"), |
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| 8 | * to deal in the Software without restriction, including without limitation |
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| 9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 10 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 11 | * Software is furnished to do so, subject to the following conditions: |
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| 12 | * |
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| 13 | * The above copyright notice and this permission notice shall be included |
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| 14 | * in all copies or substantial portions of the Software. |
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| 15 | * |
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| 16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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| 20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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| 21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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| 22 | * OTHER DEALINGS IN THE SOFTWARE. |
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| 23 | */ |
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| 24 | |||
| 25 | /** |
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| 26 | * Types, macros, etc for the GLchan datatype. |
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| 27 | * The swrast module is kind of hard-coded for 8bpp color channels but |
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| 28 | * may be recompiled to use 16- or 32-bit color channels. But that |
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| 29 | * feature is seldom used and is likely broken in various ways. |
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| 30 | */ |
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| 31 | |||
| 32 | #ifndef U_CHAN_H |
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| 33 | #define U_CHAN_H |
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| 34 | |||
| 35 | |||
| 36 | #include "main/config.h" |
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| 37 | |||
| 38 | |||
| 39 | /** |
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| 40 | * Default bits per color channel: 8, 16 or 32 |
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| 41 | */ |
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| 42 | #ifndef CHAN_BITS |
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| 43 | #define CHAN_BITS 8 |
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| 44 | #endif |
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| 45 | |||
| 46 | |||
| 47 | /** |
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| 48 | * Color channel data type. |
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| 49 | */ |
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| 50 | #if CHAN_BITS == 8 |
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| 51 | typedef GLubyte GLchan; |
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| 52 | #define CHAN_MAX 255 |
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| 53 | #define CHAN_MAXF 255.0F |
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| 54 | #define CHAN_TYPE GL_UNSIGNED_BYTE |
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| 55 | #elif CHAN_BITS == 16 |
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| 56 | typedef GLushort GLchan; |
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| 57 | #define CHAN_MAX 65535 |
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| 58 | #define CHAN_MAXF 65535.0F |
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| 59 | #define CHAN_TYPE GL_UNSIGNED_SHORT |
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| 60 | #elif CHAN_BITS == 32 |
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| 61 | typedef GLfloat GLchan; |
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| 62 | #define CHAN_MAX 1.0 |
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| 63 | #define CHAN_MAXF 1.0F |
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| 64 | #define CHAN_TYPE GL_FLOAT |
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| 65 | #else |
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| 66 | #error "illegal number of color channel bits" |
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| 67 | #endif |
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| 68 | |||
| 69 | |||
| 70 | #if CHAN_BITS == 8 |
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| 71 | |||
| 72 | #define CHAN_TO_UBYTE(c) (c) |
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| 73 | #define CHAN_TO_USHORT(c) (((c) << 8) | (c)) |
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| 74 | #define CHAN_TO_SHORT(c) (((c) << 7) | ((c) >> 1)) |
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| 75 | #define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c) |
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| 76 | |||
| 77 | #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f) |
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| 78 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f) |
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| 79 | |||
| 80 | #define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC) |
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| 81 | |||
| 82 | #elif CHAN_BITS == 16 |
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| 83 | |||
| 84 | #define CHAN_TO_UBYTE(c) ((c) >> 8) |
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| 85 | #define CHAN_TO_USHORT(c) (c) |
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| 86 | #define CHAN_TO_SHORT(c) ((c) >> 1) |
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| 87 | #define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF))) |
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| 88 | |||
| 89 | #define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f) |
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| 90 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f) |
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| 91 | |||
| 92 | #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) |
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| 93 | |||
| 94 | #elif CHAN_BITS == 32 |
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| 95 | |||
| 96 | #define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c) |
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| 97 | #define CHAN_TO_USHORT(c) ((GLushort) (CLAMP((c), 0.0f, 1.0f) * 65535.0)) |
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| 98 | #define CHAN_TO_SHORT(c) ((GLshort) (CLAMP((c), 0.0f, 1.0f) * 32767.0)) |
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| 99 | #define CHAN_TO_FLOAT(c) (c) |
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| 100 | |||
| 101 | #define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f) |
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| 102 | #define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f) |
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| 103 | |||
| 104 | #define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) |
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| 105 | |||
| 106 | #else |
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| 107 | |||
| 108 | #error unexpected CHAN_BITS size |
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| 109 | |||
| 110 | #endif |
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| 111 | |||
| 112 | |||
| 113 | /** |
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| 114 | * Convert 4 floats to GLchan values. |
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| 115 | * \param dst pointer to destination GLchan[4] array. |
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| 116 | * \param f pointer to source GLfloat[4] array. |
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| 117 | */ |
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| 118 | #define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \ |
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| 119 | do { \ |
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| 120 | UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]); \ |
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| 121 | UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]); \ |
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| 122 | UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]); \ |
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| 123 | UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]); \ |
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| 124 | } while (0) |
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| 125 | |||
| 126 | |||
| 127 | |||
| 128 | #endif /* U_CHAN_H */ |