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Diffstat (limited to 'src/mesa/drivers/dri/savage/savagespan.h')
| -rw-r--r-- | src/mesa/drivers/dri/savage/savagespan.h | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/src/mesa/drivers/dri/savage/savagespan.h b/src/mesa/drivers/dri/savage/savagespan.h deleted file mode 100644 index 41d6f75cbbe..00000000000 --- a/src/mesa/drivers/dri/savage/savagespan.h +++ /dev/null @@ -1,137 +0,0 @@ -/* - * Copyright 1998-2003 VIA Technologies, Inc. All Rights Reserved. - * Copyright 2001-2003 S3 Graphics, 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, sub license, - * 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 (including the - * next paragraph) 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 NON-INFRINGEMENT. IN NO EVENT SHALL - * VIA, S3 GRAPHICS, AND/OR ITS SUPPLIERS 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. - */ - -#ifndef _SAVAGE_SPAN_H -#define _SAVAGE_SPAN_H - -#include "drirenderbuffer.h" - - -extern void savageDDInitSpanFuncs( struct gl_context *ctx ); - -extern void -savageSetSpanFunctions(driRenderbuffer *rb, const struct gl_config *vis, - GLboolean float_depth); - - -/* - * Savage 16-bit float depth format with zExpOffset=16: - * 4 bit unsigned exponent, 12 bit mantissa - * - * The meaning of the mantissa is different from IEEE floatint point - * formats. The same number can't be encoded with different exponents. - * So no bits are wasted. - * - * exponent | range encoded by mantissa | accuracy or mantissa - * ---------+---------------------------+--------------------- - * 15 | 2^-1 .. 1 | 2^-13 - * 14 | 2^-2 .. 2^-1 | 2^-14 - * 13 | 2^-3 .. 2^-2 | 2^-15 - * ... | ... | - * 2 | 2^-14 .. 2^-13 | 2^-27 - * 1 | 2^-15 .. 2^-14 | 2^-27 - * 0 | 2^-16 .. 2^-15 | 2^-28 - * - * Note that there is no encoding for numbers < 2^-16. - */ -static INLINE GLuint savageEncodeFloat16( GLdouble x ) -{ - GLint r = (GLint)(x * 0x10000000); - GLint exp = 0; - if (r < 0x1000) - return 0; - while (r - 0x1000 > 0x0fff) { - r >>= 1; - exp++; - } - return exp > 0xf ? 0xffff : (r - 0x1000) | (exp << 12); -} -static INLINE GLdouble savageDecodeFloat16( GLuint x ) -{ - static const GLdouble pow2[16] = { - 1.0/(1<<28), 1.0/(1<<27), 1.0/(1<<26), 1.0/(1<<25), - 1.0/(1<<24), 1.0/(1<<23), 1.0/(1<<22), 1.0/(1<<21), - 1.0/(1<<20), 1.0/(1<<19), 1.0/(1<<18), 1.0/(1<<17), - 1.0/(1<<16), 1.0/(1<<15), 1.0/(1<<14), 1.0/(1<<13) - }; - static const GLdouble bias[16] = { - 1.0/(1<<16), 1.0/(1<<15), 1.0/(1<<14), 1.0/(1<<13), - 1.0/(1<<12), 1.0/(1<<11), 1.0/(1<<10), 1.0/(1<< 9), - 1.0/(1<< 8), 1.0/(1<< 7), 1.0/(1<< 6), 1.0/(1<< 5), - 1.0/(1<< 4), 1.0/(1<< 3), 1.0/(1<< 2), 1.0/(1<< 1) - }; - GLuint mant = x & 0x0fff; - GLuint exp = (x >> 12) & 0xf; - return bias[exp] + pow2[exp]*mant; -} - -/* - * Savage 24-bit float depth format with zExpOffset=32: - * 5 bit unsigned exponent, 19 bit mantissa - * - * Details analogous to the 16-bit format. - */ -static INLINE GLuint savageEncodeFloat24( GLdouble x ) -{ - int64_t r = (int64_t)(x * ((int64_t)1 << (19+32))); - GLint exp = 0; - if (r < 0x80000) - return 0; - while (r - 0x80000 > 0x7ffff) { - r >>= 1; - exp++; - } - return exp > 0x1f ? 0xffffff : (r - 0x80000) | (exp << 19); -} -#define _1 (int64_t)1 -static INLINE GLdouble savageDecodeFloat24( GLuint x ) -{ - static const GLdouble pow2[32] = { - 1.0/(_1<<51), 1.0/(_1<<50), 1.0/(_1<<49), 1.0/(_1<<48), - 1.0/(_1<<47), 1.0/(_1<<46), 1.0/(_1<<45), 1.0/(_1<<44), - 1.0/(_1<<43), 1.0/(_1<<42), 1.0/(_1<<41), 1.0/(_1<<40), - 1.0/(_1<<39), 1.0/(_1<<38), 1.0/(_1<<37), 1.0/(_1<<36), - 1.0/(_1<<35), 1.0/(_1<<34), 1.0/(_1<<33), 1.0/(_1<<32), - 1.0/(_1<<31), 1.0/(_1<<30), 1.0/(_1<<29), 1.0/(_1<<28), - 1.0/(_1<<27), 1.0/(_1<<26), 1.0/(_1<<25), 1.0/(_1<<24), - 1.0/(_1<<23), 1.0/(_1<<22), 1.0/(_1<<21), 1.0/(_1<<20) - }; - static const GLdouble bias[32] = { - 1.0/(_1<<32), 1.0/(_1<<31), 1.0/(_1<<30), 1.0/(_1<<29), - 1.0/(_1<<28), 1.0/(_1<<27), 1.0/(_1<<26), 1.0/(_1<<25), - 1.0/(_1<<24), 1.0/(_1<<23), 1.0/(_1<<22), 1.0/(_1<<21), - 1.0/(_1<<20), 1.0/(_1<<19), 1.0/(_1<<18), 1.0/(_1<<17), - 1.0/(_1<<16), 1.0/(_1<<15), 1.0/(_1<<14), 1.0/(_1<<13), - 1.0/(_1<<12), 1.0/(_1<<11), 1.0/(_1<<10), 1.0/(_1<< 9), - 1.0/(_1<< 8), 1.0/(_1<< 7), 1.0/(_1<< 6), 1.0/(_1<< 5), - 1.0/(_1<< 4), 1.0/(_1<< 3), 1.0/(_1<< 2), 1.0/(_1<< 1) - }; - GLuint mant = x & 0x7ffff; - GLuint exp = (x >> 19) & 0x1f; - return bias[exp] + pow2[exp]*mant; -} -#undef _1 - - -#endif |