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 void
  84 lp_build_unpack_rgba_soa(LLVMBuilderRef builder,
  85                          const struct util_format_description *format_desc,
  86                          struct lp_type type,
  87                          LLVMValueRef packed,
  88                          LLVMValueRef *rgba)
  89 {
  90    LLVMValueRef inputs[4];
  91    unsigned start;
  92    unsigned chan;
  93
  94    /* FIXME: Support more formats */
  95    assert(format_desc->layout == UTIL_FORMAT_LAYOUT_PLAIN);
  96    assert(format_desc->block.width == 1);
  97    assert(format_desc->block.height == 1);
  98    assert(format_desc->block.bits <= 32);
  99
 100    /* Decode the input vector components */
 101    start = 0;
 102    for (chan = 0; chan < 4; ++chan) {
 103       unsigned width = format_desc->channel[chan].size;
 104       unsigned stop = start + width;
 105       LLVMValueRef input;
 106
 107       input = packed;
 108
 109       switch(format_desc->channel[chan].type) {
 110       case UTIL_FORMAT_TYPE_VOID:
 111          input = NULL;
 112          break;
 113
 114       case UTIL_FORMAT_TYPE_UNSIGNED:
 115          if(type.floating) {
 116             if(start)
 117                input = LLVMBuildLShr(builder, input, lp_build_const_int_vec(type, start), "");
 118             if(stop < format_desc->block.bits) {
 119                unsigned mask = ((unsigned long long)1 << width) - 1;
 120                input = LLVMBuildAnd(builder, input, lp_build_const_int_vec(type, mask), "");
 121             }
 122
 123             if(format_desc->channel[chan].normalized)
 124                input = lp_build_unsigned_norm_to_float(builder, width, type, input);
 125             else
 126                input = LLVMBuildFPToSI(builder, input, lp_build_vec_type(type), "");
 127          }
 128          else {
 129             /* FIXME */
 130             assert(0);
 131             input = lp_build_undef(type);
 132          }
 133          break;
 134
 135       default:
 136          /* fall through */
 137          input = lp_build_undef(type);
 138          break;
 139       }
 140
 141       inputs[chan] = input;
 142
 143       start = stop;
 144    }
 145
 146    lp_build_format_swizzle_soa(format_desc, type, inputs, rgba);
 147 }