diff options
Diffstat (limited to 'mesalib')
| -rw-r--r-- | mesalib/src/mesa/swrast/s_chan.h | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/mesalib/src/mesa/swrast/s_chan.h b/mesalib/src/mesa/swrast/s_chan.h new file mode 100644 index 000000000..94ac8b65b --- /dev/null +++ b/mesalib/src/mesa/swrast/s_chan.h @@ -0,0 +1,119 @@ +/* + * Mesa 3-D graphics library + * + * Copyright (C) 2011 VMware, Inc. 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 + * THE AUTHORS 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. + */ + +/** + * Types, macros, etc for the GLchan datatype. + * The swrast module is kind of hard-coded for 8bpp color channels but + * may be recompiled to use 16- or 32-bit color channels. But that + * feature is seldom used and is likely broken in various ways. + */ + +#ifndef U_CHAN_H +#define U_CHAN_H + + +#include "main/config.h" + + +/** + * Color channel data type. + */ +#if CHAN_BITS == 8 + typedef GLubyte GLchan; +#define CHAN_MAX 255 +#define CHAN_MAXF 255.0F +#define CHAN_TYPE GL_UNSIGNED_BYTE +#elif CHAN_BITS == 16 + typedef GLushort GLchan; +#define CHAN_MAX 65535 +#define CHAN_MAXF 65535.0F +#define CHAN_TYPE GL_UNSIGNED_SHORT +#elif CHAN_BITS == 32 + typedef GLfloat GLchan; +#define CHAN_MAX 1.0 +#define CHAN_MAXF 1.0F +#define CHAN_TYPE GL_FLOAT +#else +#error "illegal number of color channel bits" +#endif + + +#if CHAN_BITS == 8 + +#define CHAN_TO_UBYTE(c) (c) +#define CHAN_TO_USHORT(c) (((c) << 8) | (c)) +#define CHAN_TO_SHORT(c) (((c) << 7) | ((c) >> 1)) +#define CHAN_TO_FLOAT(c) UBYTE_TO_FLOAT(c) + +#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_UBYTE(c, f) +#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_UBYTE(c, f) + +#define COPY_CHAN4(DST, SRC) COPY_4UBV(DST, SRC) + +#elif CHAN_BITS == 16 + +#define CHAN_TO_UBYTE(c) ((c) >> 8) +#define CHAN_TO_USHORT(c) (c) +#define CHAN_TO_SHORT(c) ((c) >> 1) +#define CHAN_TO_FLOAT(c) ((GLfloat) ((c) * (1.0 / CHAN_MAXF))) + +#define CLAMPED_FLOAT_TO_CHAN(c, f) CLAMPED_FLOAT_TO_USHORT(c, f) +#define UNCLAMPED_FLOAT_TO_CHAN(c, f) UNCLAMPED_FLOAT_TO_USHORT(c, f) + +#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) + +#elif CHAN_BITS == 32 + +#define CHAN_TO_UBYTE(c) FLOAT_TO_UBYTE(c) +#define CHAN_TO_USHORT(c) ((GLushort) (CLAMP((c), 0.0f, 1.0f) * 65535.0)) +#define CHAN_TO_SHORT(c) ((GLshort) (CLAMP((c), 0.0f, 1.0f) * 32767.0)) +#define CHAN_TO_FLOAT(c) (c) + +#define CLAMPED_FLOAT_TO_CHAN(c, f) c = (f) +#define UNCLAMPED_FLOAT_TO_CHAN(c, f) c = (f) + +#define COPY_CHAN4(DST, SRC) COPY_4V(DST, SRC) + +#else + +#error unexpected CHAN_BITS size + +#endif + + +/** + * Convert 4 floats to GLchan values. + * \param dst pointer to destination GLchan[4] array. + * \param f pointer to source GLfloat[4] array. + */ +#define UNCLAMPED_FLOAT_TO_RGBA_CHAN(dst, f) \ +do { \ + UNCLAMPED_FLOAT_TO_CHAN((dst)[0], (f)[0]); \ + UNCLAMPED_FLOAT_TO_CHAN((dst)[1], (f)[1]); \ + UNCLAMPED_FLOAT_TO_CHAN((dst)[2], (f)[2]); \ + UNCLAMPED_FLOAT_TO_CHAN((dst)[3], (f)[3]); \ +} while (0) + + + +#endif /* U_CHAN_H */ |