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120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*
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* Mesa 3-D graphics library
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*
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* Copyright (C) 2011 VMware, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/**
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* Types, macros, etc for the GLchan datatype.
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* The swrast module is kind of hard-coded for 8bpp color channels but
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* may be recompiled to use 16- or 32-bit color channels. But that
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* feature is seldom used and is likely broken in various ways.
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*/
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#ifndef U_CHAN_H
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#define U_CHAN_H
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#include "main/config.h"
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/**
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* Color channel data type.
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*/
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#if CHAN_BITS == 8
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typedef GLubyte GLchan;
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#define CHAN_MAX 255
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#define CHAN_MAXF 255.0F
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#define CHAN_TYPE GL_UNSIGNED_BYTE
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#elif CHAN_BITS == 16
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typedef GLushort GLchan;
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#define CHAN_MAX 65535
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#define CHAN_MAXF 65535.0F
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#define CHAN_TYPE GL_UNSIGNED_SHORT
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#elif CHAN_BITS == 32
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typedef GLfloat GLchan;
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#define CHAN_MAX 1.0
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#define CHAN_MAXF 1.0F
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#define CHAN_TYPE GL_FLOAT
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#else
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#error "illegal number of color channel bits"
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#endif
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#if CHAN_BITS == 8
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#define CHAN_TO_UBYTE(c) (c)
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#define CHAN_TO_USHORT(c) (((c) << 8) | (c))
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#define CHAN_TO_SHORT(c) (((c) << 7) | ((c) >> 1))
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#define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c)
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#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f)
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#define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC)
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#elif CHAN_BITS == 16
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#define CHAN_TO_UBYTE(c) ((c) >> 8)
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#define CHAN_TO_USHORT(c) (c)
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#define CHAN_TO_SHORT(c) ((c) >> 1)
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#define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF)))
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#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f)
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#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
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#elif CHAN_BITS == 32
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#define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c)
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#define CHAN_TO_USHORT(c) ((GLushort) (CLAMP((c), 0.0f, 1.0f) * 65535.0))
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#define CHAN_TO_SHORT(c) ((GLshort) (CLAMP((c), 0.0f, 1.0f) * 32767.0))
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#define CHAN_TO_FLOAT(c) (c)
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#define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
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#define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f)
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#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC)
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#else
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#error unexpected CHAN_BITS size
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#endif
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/**
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* Convert 4 floats to GLchan values.
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* \param dst pointer to destination GLchan[4] array.
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* \param f pointer to source GLfloat[4] array.
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*/
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#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \
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do { \
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UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]); \
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UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]); \
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UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]); \
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UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]); \
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} while (0)
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#endif /* U_CHAN_H */
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