src/gallium/auxiliary/gallivm/lp_bld_format_aos_array.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2012 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
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   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
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  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 "lp_bld_const.h"
  29 #include "lp_bld_struct.h"
  30 #include "lp_bld_format.h"
  31 #include "lp_bld_debug.h"
  32 #include "lp_bld_type.h"
  33 #include "lp_bld_conv.h"
  34 #include "lp_bld_pack.h"
  35
  36 #include "util/u_memory.h"
  37 #include "util/u_format.h"
  38 #include "pipe/p_state.h"
  39
  40 /**
  41  * @brief lp_build_fetch_rgba_aos_array
  42  *
  43  * \param format_desc   describes format of the image we're fetching from
  44  * \param dst_type      output type
  45  * \param base_ptr      address of the pixel block (or the texel if uncompressed)
  46  * \param offset        ptr offset
  47  */
  48 LLVMValueRef
  49 lp_build_fetch_rgba_aos_array(struct gallivm_state *gallivm,
  50                               const struct util_format_description *format_desc,
  51                               struct lp_type dst_type,
  52                               LLVMValueRef base_ptr,
  53                               LLVMValueRef offset)
  54 {
  55    struct lp_build_context bld;
  56    LLVMBuilderRef builder = gallivm->builder;
  57    LLVMTypeRef src_elem_type, src_vec_type;
  58    LLVMValueRef ptr, res = NULL;
  59    struct lp_type src_type;
  60
  61    memset(&src_type, 0, sizeof src_type);
  62    src_type.floating = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FLOAT;
  63    src_type.fixed    = format_desc->channel[0].type == UTIL_FORMAT_TYPE_FIXED;
  64    src_type.sign     = format_desc->channel[0].type != UTIL_FORMAT_TYPE_UNSIGNED;
  65    src_type.norm     = format_desc->channel[0].normalized;
  66    src_type.width    = format_desc->channel[0].size;
  67    src_type.length   = format_desc->nr_channels;
  68
  69    assert(src_type.length <= dst_type.length);
  70
  71    src_elem_type = lp_build_elem_type(gallivm, src_type);
  72    src_vec_type  = lp_build_vec_type(gallivm,  src_type);
  73
  74    /* Read whole vector from memory, unaligned */
  75    if (!res) {
  76       ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");
  77       ptr = LLVMBuildPointerCast(builder, ptr, LLVMPointerType(src_vec_type, 0), "");
  78       res = LLVMBuildLoad(builder, ptr, "");
  79       lp_set_load_alignment(res, src_type.width / 8);
  80    }
  81
  82    /* Truncate doubles to float */
  83    if (src_type.floating && src_type.width == 64) {
  84       src_type.width = 32;
  85       src_vec_type  = lp_build_vec_type(gallivm,  src_type);
  86
  87       res = LLVMBuildFPTrunc(builder, res, src_vec_type, "");
  88    }
  89
  90    /* Expand to correct length */
  91    if (src_type.length < dst_type.length) {
  92       res = lp_build_pad_vector(gallivm, res, src_type, dst_type.length);
  93       src_type.length = dst_type.length;
  94    }
  95
  96    /* Convert to correct format */
  97    lp_build_conv(gallivm, src_type, dst_type, &res, 1, &res, 1);
  98
  99    /* Swizzle it */
 100    lp_build_context_init(&bld, gallivm, dst_type);
 101    return lp_build_format_swizzle_aos(format_desc, &bld, res);
 102 }