src/gallium/auxiliary/gallivm/lp_bld_format_soa.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   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 VMWARE 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
  29 #include "util/u_format.h"
  30
  31 #include "lp_bld_type.h"
  32 #include "lp_bld_const.h"
  33 #include "lp_bld_conv.h"
  34 #include "lp_bld_format.h"
  35
  36
  37 static LLVMValueRef
  38 lp_build_format_swizzle_chan_soa(struct lp_type type,
  39                                  const LLVMValueRef *unswizzled,
  40                                  enum util_format_swizzle swizzle)
  41 {
  42    switch (swizzle) {
  43    case UTIL_FORMAT_SWIZZLE_X:
  44    case UTIL_FORMAT_SWIZZLE_Y:
  45    case UTIL_FORMAT_SWIZZLE_Z:
  46    case UTIL_FORMAT_SWIZZLE_W:
  47       return unswizzled[swizzle];
  48    case UTIL_FORMAT_SWIZZLE_0:
  49       return lp_build_zero(type);
  50    case UTIL_FORMAT_SWIZZLE_1:
  51       return lp_build_one(type);
  52    case UTIL_FORMAT_SWIZZLE_NONE:
  53       return lp_build_undef(type);
  54    default:
  55       assert(0);
  56       return lp_build_undef(type);
  57    }
  58 }
  59
  60
  61 void
  62 lp_build_format_swizzle_soa(const struct util_format_description *format_desc,
  63                             struct lp_type type,
  64                             const LLVMValueRef *unswizzled,
  65                             LLVMValueRef *swizzled)
  66 {
  67    if(format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS) {
  68       enum util_format_swizzle swizzle = format_desc->swizzle[0];
  69       LLVMValueRef depth = lp_build_format_swizzle_chan_soa(type, unswizzled, swizzle);
  70       swizzled[2] = swizzled[1] = swizzled[0] = depth;
  71       swizzled[3] = lp_build_one(type);
  72    }
  73    else {
  74       unsigned chan;
  75       for (chan = 0; chan < 4; ++chan) {
  76          enum util_format_swizzle swizzle = format_desc->swizzle[chan];
  77          swizzled[chan] = lp_build_format_swizzle_chan_soa(type, unswizzled, swizzle);
  78       }
  79    }
  80 }
  81
  82
  83 /**
  84  * Unpack several pixels in SoA.
  85  *
  86  * It takes a vector of packed pixels:
  87  *
  88  *   packed = {P0, P1, P2, P3, ..., Pn}
  89  *
  90  * And will produce four vectors:
  91  *
  92  *   red    = {R0, R1, R2, R3, ..., Rn}
  93  *   green  = {G0, G1, G2, G3, ..., Gn}
  94  *   blue   = {B0, B1, B2, B3, ..., Bn}
  95  *   alpha  = {A0, A1, A2, A3, ..., An}
  96  *
  97  * It requires that a packed pixel fits into an element of the output
  98  * channels. The common case is when converting pixel with a depth of 32 bit or
  99  * less into floats.
 100  */
 101 void
 102 lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
 103                          const struct util_format_description *format_desc,
 104                          struct lp_type type,
 105                          LLVMValueRef packed,
 106                          LLVMValueRef *rgba)
 107 {
 108    LLVMValueRef inputs[4];
 109    unsigned start;
 110    unsigned chan;
 111
 112    /* FIXME: Support more pixel formats */
 113    assert(format_desc->block.width == 1);
 114    assert(format_desc->block.height == 1);
 115    assert(format_desc->block.bits <= type.width);
 116    /* FIXME: Support more output types */
 117    assert(type.floating);
 118    assert(type.width == 32);
 119
 120    /* Decode the input vector components */
 121    start = 0;
 122    for (chan = 0; chan < format_desc->nr_channels; ++chan) {
 123       unsigned width = format_desc->channel[chan].size;
 124       unsigned stop = start + width;
 125       LLVMValueRef input;
 126
 127       input = packed;
 128
 129       switch(format_desc->channel[chan].type) {
 130       case UTIL_FORMAT_TYPE_VOID:
 131          input = lp_build_undef(type);
 132          break;
 133
 134       case UTIL_FORMAT_TYPE_UNSIGNED:
 135          /*
 136           * Align the LSB
 137           */
 138
 139          if (start) {
 140             input = LLVMBuildLShr(builder, input, lp_build_const_int_vec(type, start), "");
 141          }
 142
 143          /*
 144           * Zero the MSBs
 145           */
 146
 147          if (stop < format_desc->block.bits) {
 148             unsigned mask = ((unsigned long long)1 << width) - 1;
 149             input = LLVMBuildAnd(builder, input, lp_build_const_int_vec(type, mask), "");
 150          }
 151
 152          /*
 153           * Type conversion
 154           */
 155
 156          if (type.floating) {
 157             if(format_desc->channel[chan].normalized)
 158                input = lp_build_unsigned_norm_to_float(builder, width, type, input);
 159             else
 160                input = LLVMBuildSIToFP(builder, input, lp_build_vec_type(type), "");
 161          }
 162          else {
 163             /* FIXME */
 164             assert(0);
 165             input = lp_build_undef(type);
 166          }
 167
 168          break;
 169
 170       case UTIL_FORMAT_TYPE_SIGNED:
 171          /*
 172           * Align the sign bit first.
 173           */
 174
 175          if (stop < type.width) {
 176             unsigned bits = type.width - stop;
 177             LLVMValueRef bits_val = lp_build_const_int_vec(type, bits);
 178             input = LLVMBuildShl(builder, input, bits_val, "");
 179          }
 180
 181          /*
 182           * Align the LSB (with an arithmetic shift to preserve the sign)
 183           */
 184
 185          if (format_desc->channel[chan].size < type.width) {
 186             unsigned bits = type.width - format_desc->channel[chan].size;
 187             LLVMValueRef bits_val = lp_build_const_int_vec(type, bits);
 188             input = LLVMBuildAShr(builder, input, bits_val, "");
 189          }
 190
 191          /*
 192           * Type conversion
 193           */
 194
 195          if (type.floating) {
 196             input = LLVMBuildSIToFP(builder, input, lp_build_vec_type(type), "");
 197             if (format_desc->channel[chan].normalized) {
 198                double scale = 1.0 / ((1 << (format_desc->channel[chan].size - 1)) - 1);
 199                LLVMValueRef scale_val = lp_build_const_vec(type, scale);
 200                input = LLVMBuildMul(builder, input, scale_val, "");
 201             }
 202          }
 203          else {
 204             /* FIXME */
 205             assert(0);
 206             input = lp_build_undef(type);
 207          }
 208
 209          break;
 210
 211       case UTIL_FORMAT_TYPE_FLOAT:
 212          if (type.floating) {
 213             assert(start == 0);
 214             assert(stop == 32);
 215             assert(type.width == 32);
 216             input = LLVMBuildBitCast(builder, input, lp_build_vec_type(type), "");
 217          }
 218          else {
 219             /* FIXME */
 220             assert(0);
 221             input = lp_build_undef(type);
 222          }
 223          break;
 224
 225       case UTIL_FORMAT_TYPE_FIXED:
 226          assert(0);
 227          input = lp_build_undef(type);
 228          break;
 229
 230       default:
 231          assert(0);
 232          input = lp_build_undef(type);
 233          break;
 234       }
 235
 236       inputs[chan] = input;
 237
 238       start = stop;
 239    }
 240
 241    lp_build_format_swizzle_soa(format_desc, type, inputs, rgba);
 242 }