src/gallium/auxiliary/tgsi/tgsi_util.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "util/u_debug.h"
  29 #include "pipe/p_shader_tokens.h"
  30 #include "tgsi_parse.h"
  31 #include "tgsi_build.h"
  32 #include "tgsi_util.h"
  33
  34 union pointer_hack
  35 {
  36    void *pointer;
  37    uint64_t uint64;
  38 };
  39
  40 void *
  41 tgsi_align_128bit(
  42    void *unaligned )
  43 {
  44    union pointer_hack ph;
  45
  46    ph.uint64 = 0;
  47    ph.pointer = unaligned;
  48    ph.uint64 = (ph.uint64 + 15) & ~15;
  49    return ph.pointer;
  50 }
  51
  52 unsigned
  53 tgsi_util_get_src_register_swizzle(
  54    const struct tgsi_src_register *reg,
  55    unsigned component )
  56 {
  57    switch( component ) {
  58    case 0:
  59       return reg->SwizzleX;
  60    case 1:
  61       return reg->SwizzleY;
  62    case 2:
  63       return reg->SwizzleZ;
  64    case 3:
  65       return reg->SwizzleW;
  66    default:
  67       assert( 0 );
  68    }
  69    return 0;
  70 }
  71
  72
  73 unsigned
  74 tgsi_util_get_full_src_register_swizzle(
  75    const struct tgsi_full_src_register  *reg,
  76    unsigned component )
  77 {
  78    return tgsi_util_get_src_register_swizzle(
  79       &reg->SrcRegister,
  80       component );
  81 }
  82
  83 void
  84 tgsi_util_set_src_register_swizzle(
  85    struct tgsi_src_register *reg,
  86    unsigned swizzle,
  87    unsigned component )
  88 {
  89    switch( component ) {
  90    case 0:
  91       reg->SwizzleX = swizzle;
  92       break;
  93    case 1:
  94       reg->SwizzleY = swizzle;
  95       break;
  96    case 2:
  97       reg->SwizzleZ = swizzle;
  98       break;
  99    case 3:
 100       reg->SwizzleW = swizzle;
 101       break;
 102    default:
 103       assert( 0 );
 104    }
 105 }
 106
 107 unsigned
 108 tgsi_util_get_full_src_register_sign_mode(
 109    const struct  tgsi_full_src_register *reg,
 110    unsigned component )
 111 {
 112    unsigned sign_mode;
 113
 114    if( reg->SrcRegisterExtMod.Absolute ) {
 115       /* Consider only the post-abs negation. */
 116
 117       if( reg->SrcRegisterExtMod.Negate ) {
 118          sign_mode = TGSI_UTIL_SIGN_SET;
 119       }
 120       else {
 121          sign_mode = TGSI_UTIL_SIGN_CLEAR;
 122       }
 123    }
 124    else {
 125       /* Accumulate the three negations. */
 126
 127       unsigned negate;
 128
 129       negate = reg->SrcRegister.Negate;
 130
 131       if( reg->SrcRegisterExtMod.Negate ) {
 132          negate = !negate;
 133       }
 134
 135       if( negate ) {
 136          sign_mode = TGSI_UTIL_SIGN_TOGGLE;
 137       }
 138       else {
 139          sign_mode = TGSI_UTIL_SIGN_KEEP;
 140       }
 141    }
 142
 143    return sign_mode;
 144 }
 145
 146 void
 147 tgsi_util_set_full_src_register_sign_mode(
 148    struct tgsi_full_src_register *reg,
 149    unsigned sign_mode )
 150 {
 151    switch (sign_mode)
 152    {
 153    case TGSI_UTIL_SIGN_CLEAR:
 154       reg->SrcRegister.Negate = 0;
 155       reg->SrcRegisterExtMod.Absolute = 1;
 156       reg->SrcRegisterExtMod.Negate = 0;
 157       break;
 158
 159    case TGSI_UTIL_SIGN_SET:
 160       reg->SrcRegister.Negate = 0;
 161       reg->SrcRegisterExtMod.Absolute = 1;
 162       reg->SrcRegisterExtMod.Negate = 1;
 163       break;
 164
 165    case TGSI_UTIL_SIGN_TOGGLE:
 166       reg->SrcRegister.Negate = 1;
 167       reg->SrcRegisterExtMod.Absolute = 0;
 168       reg->SrcRegisterExtMod.Negate = 0;
 169       break;
 170
 171    case TGSI_UTIL_SIGN_KEEP:
 172       reg->SrcRegister.Negate = 0;
 173       reg->SrcRegisterExtMod.Absolute = 0;
 174       reg->SrcRegisterExtMod.Negate = 0;
 175       break;
 176
 177    default:
 178       assert( 0 );
 179    }
 180 }