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      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
      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 #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 #include "lp_bld_intr.h"
     36 #include "lp_bld_gather.h"
     37 
     38 #include "util/u_memory.h"
     39 #include "util/u_format.h"
     40 #include "pipe/p_state.h"
     41 
     42 
     43 
     44 /**
     45  * @brief lp_build_fetch_rgba_aos_array
     46  *
     47  * \param format_desc   describes format of the image we're fetching from
     48  * \param dst_type      output type
     49  * \param base_ptr      address of the pixel block (or the texel if uncompressed)
     50  * \param offset        ptr offset
     51  */
     52 LLVMValueRef
     53 lp_build_fetch_rgba_aos_array(struct gallivm_state *gallivm,
     54                               const struct util_format_description *format_desc,
     55                               struct lp_type dst_type,
     56                               LLVMValueRef base_ptr,
     57                               LLVMValueRef offset)
     58 {
     59    struct lp_build_context bld;
     60    LLVMBuilderRef builder = gallivm->builder;
     61    LLVMTypeRef src_vec_type;
     62    LLVMValueRef ptr, res = NULL;
     63    struct lp_type src_type;
     64    boolean pure_integer = format_desc->channel[0].pure_integer;
     65    struct lp_type tmp_type;
     66 
     67    lp_type_from_format_desc(&src_type, format_desc);
     68 
     69    assert(src_type.length <= dst_type.length);
     70 
     71    src_vec_type  = lp_build_vec_type(gallivm,  src_type);
     72 
     73    /*
     74     * Read whole vector from memory, unaligned.
     75     * XXX: Note it's actually aligned to element type. Not sure if all
     76     * callers are able to guarantee that (whereas for others, we should
     77     * be able to use full alignment when there's 2 or 4 channels).
     78     * (If all callers can guarantee element type alignment, we should
     79     * relax alignment restrictions elsewhere.)
     80     */
     81    ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");
     82    ptr = LLVMBuildPointerCast(builder, ptr, LLVMPointerType(src_vec_type, 0), "");
     83    res = LLVMBuildLoad(builder, ptr, "");
     84    LLVMSetAlignment(res, src_type.width / 8);
     85 
     86    /* Truncate doubles to float */
     87    if (src_type.floating && src_type.width == 64) {
     88       src_type.width = 32;
     89       src_vec_type  = lp_build_vec_type(gallivm,  src_type);
     90 
     91       res = LLVMBuildFPTrunc(builder, res, src_vec_type, "");
     92    }
     93 
     94    /* Expand to correct length */
     95    if (src_type.length < dst_type.length) {
     96       res = lp_build_pad_vector(gallivm, res, dst_type.length);
     97       src_type.length = dst_type.length;
     98    }
     99 
    100    tmp_type = dst_type;
    101    if (pure_integer) {
    102        /* some callers expect (fake) floats other real ints. */
    103       tmp_type.floating = 0;
    104       tmp_type.sign = src_type.sign;
    105    }
    106 
    107    /* Convert to correct format */
    108    lp_build_conv(gallivm, src_type, tmp_type, &res, 1, &res, 1);
    109 
    110    /* Swizzle it */
    111    lp_build_context_init(&bld, gallivm, tmp_type);
    112    res = lp_build_format_swizzle_aos(format_desc, &bld, res);
    113 
    114    /* Bitcast to floats (for pure integers) when requested */
    115    if (pure_integer && dst_type.floating) {
    116       res = LLVMBuildBitCast(builder, res, lp_build_vec_type(gallivm, dst_type), "");
    117    }
    118 
    119    return res;
    120 }
    121