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/**************************************************************************

 *

 * Copyright 2012 VMware, Inc.

 * All Rights Reserved.

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the

 * "Software"), to deal in the Software without restriction, including

 * without limitation the rights to use, copy, modify, merge, publish,

 * distribute, sub license, and/or sell copies of the Software, and to

 * permit persons to whom the Software is furnished to do so, subject to

 * the following conditions:

 *

 * The above copyright notice and this permission notice (including the

 * next paragraph) shall be included in all copies or substantial portions

 * of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR

 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

 *

 **************************************************************************/

#include "lp_bld_const.h"

#include "lp_bld_struct.h"

#include "lp_bld_format.h"

#include "lp_bld_debug.h"

#include "lp_bld_type.h"

#include "lp_bld_conv.h"

#include "lp_bld_pack.h"

#include "lp_bld_intr.h"

#include "lp_bld_gather.h"

#include "util/u_memory.h"

#include "util/u_format.h"

#include "pipe/p_state.h"

/**

 * @brief lp_build_fetch_rgba_aos_array

 *

 * \param format_desc   describes format of the image we're fetching from

 * \param dst_type      output type

 * \param base_ptr      address of the pixel block (or the texel if uncompressed)

 * \param offset        ptr offset

 */

LLVMValueRef

lp_build_fetch_rgba_aos_array(struct gallivm_state *gallivm,

                              const struct util_format_description *format_desc,

                              struct lp_type dst_type,

                              LLVMValueRef base_ptr,

                              LLVMValueRef offset)

{

   struct lp_build_context bld;

   LLVMBuilderRef builder = gallivm->builder;

   LLVMTypeRef src_vec_type;

   LLVMValueRef ptr, res = NULL;

   struct lp_type src_type;

   boolean pure_integer = format_desc->channel[0].pure_integer;

   struct lp_type tmp_type;

   lp_type_from_format_desc(&src_type, format_desc);

   assert(src_type.length <= dst_type.length);

   src_vec_type  = lp_build_vec_type(gallivm,  src_type);

   /* Read whole vector from memory, unaligned */

   ptr = LLVMBuildGEP(builder, base_ptr, &offset, 1, "");

   ptr = LLVMBuildPointerCast(builder, ptr, LLVMPointerType(src_vec_type, 0), "");

   res = LLVMBuildLoad(builder, ptr, "");

   lp_set_load_alignment(res, src_type.width / 8);

   /* Truncate doubles to float */

   if (src_type.floating && src_type.width == 64) {

      src_type.width = 32;

      src_vec_type  = lp_build_vec_type(gallivm,  src_type);

      res = LLVMBuildFPTrunc(builder, res, src_vec_type, "");

   }

   /* Expand to correct length */

   if (src_type.length < dst_type.length) {

      res = lp_build_pad_vector(gallivm, res, dst_type.length);

      src_type.length = dst_type.length;

   }

   tmp_type = dst_type;

   if (pure_integer) {

       /* some callers expect (fake) floats other real ints. */

      tmp_type.floating = 0;

      tmp_type.sign = src_type.sign;

   }

   /* Convert to correct format */

   lp_build_conv(gallivm, src_type, tmp_type, &res, 1, &res, 1);

   /* Swizzle it */

   lp_build_context_init(&bld, gallivm, tmp_type);

   res = lp_build_format_swizzle_aos(format_desc, &bld, res);

   /* Bitcast to floats (for pure integers) when requested */

   if (pure_integer && dst_type.floating) {

      res = LLVMBuildBitCast(builder, res, lp_build_vec_type(gallivm, dst_type), "");

   }

   return res;

}