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

 *

 * Copyright 2010 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 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

 * THE COPYRIGHT HOLDERS, AUTHORS 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.

 *

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

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

 * of the Software.

 *

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

#include "lp_bld_type.h"

#include "lp_bld_arit.h"

#include "lp_bld_const.h"

#include "lp_bld_swizzle.h"

#include "lp_bld_quad.h"

#include "lp_bld_pack.h"

static const unsigned char

swizzle_left[4] = {

   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_LEFT,

   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_LEFT

};

static const unsigned char

swizzle_right[4] = {

   LP_BLD_QUAD_TOP_RIGHT,    LP_BLD_QUAD_TOP_RIGHT,

   LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT

};

static const unsigned char

swizzle_top[4] = {

   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT,

   LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT

};

static const unsigned char

swizzle_bottom[4] = {

   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT,

   LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT

};

LLVMValueRef

lp_build_ddx(struct lp_build_context *bld,

             LLVMValueRef a)

{

   LLVMValueRef a_left  = lp_build_swizzle_aos(bld, a, swizzle_left);

   LLVMValueRef a_right = lp_build_swizzle_aos(bld, a, swizzle_right);

   return lp_build_sub(bld, a_right, a_left);

}

LLVMValueRef

lp_build_ddy(struct lp_build_context *bld,

             LLVMValueRef a)

{

   LLVMValueRef a_top    = lp_build_swizzle_aos(bld, a, swizzle_top);

   LLVMValueRef a_bottom = lp_build_swizzle_aos(bld, a, swizzle_bottom);

   return lp_build_sub(bld, a_bottom, a_top);

}

/*

 * Helper for building packed ddx/ddy vector for one coord (scalar per quad

 * values). The vector will look like this (8-wide):

 * dr1dx _____ -dr1dy _____ dr2dx _____ -dr2dy _____

 * This only requires one shuffle instead of two for more straightforward packing.

 */

LLVMValueRef

lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,

                                 LLVMValueRef a)

{

   struct gallivm_state *gallivm = bld->gallivm;

   LLVMBuilderRef builder = gallivm->builder;

   LLVMValueRef vec1, vec2;

   /* use aos swizzle helper */

   static const unsigned char swizzle1[] = { /* no-op swizzle */

      LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE,

      LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_SWIZZLE_DONTCARE

   };

   static const unsigned char swizzle2[] = {

      LP_BLD_QUAD_TOP_RIGHT, LP_BLD_SWIZZLE_DONTCARE,

      LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE

   };

   vec1 = lp_build_swizzle_aos(bld, a, swizzle1);

   vec2 = lp_build_swizzle_aos(bld, a, swizzle2);

   if (bld->type.floating)

      return LLVMBuildFSub(builder, vec2, vec1, "ddxddy");

   else

      return LLVMBuildSub(builder, vec2, vec1, "ddxddy");

}

/*

 * Helper for building packed ddx/ddy vector for one coord (scalar per quad

 * values). The vector will look like this (8-wide):

 * ds1dx ds1dy dt1dx dt1dy ds2dx ds2dy dt2dx dt2dy

 * This only needs 2 (v)shufps.

 */

LLVMValueRef

lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,

                                 LLVMValueRef a, LLVMValueRef b)

{

   struct gallivm_state *gallivm = bld->gallivm;

   LLVMBuilderRef builder = gallivm->builder;

   LLVMValueRef shuffles1[LP_MAX_VECTOR_LENGTH/4];

   LLVMValueRef shuffles2[LP_MAX_VECTOR_LENGTH/4];

   LLVMValueRef vec1, vec2;

   unsigned length, num_quads, i;

   /* XXX: do hsub version */

   length = bld->type.length;

   num_quads = length / 4;

   for (i = 0; i < num_quads; i++) {

      unsigned s1 = 4 * i;

      unsigned s2 = 4 * i + length;

      shuffles1[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);

      shuffles1[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);

      shuffles1[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);

      shuffles1[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);

      shuffles2[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s1);

      shuffles2[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s1);

      shuffles2[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s2);

      shuffles2[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s2);

   }

   vec1 = LLVMBuildShuffleVector(builder, a, b,

                                 LLVMConstVector(shuffles1, length), "");

   vec2 = LLVMBuildShuffleVector(builder, a, b,

                                 LLVMConstVector(shuffles2, length), "");

   if (bld->type.floating)

      return LLVMBuildFSub(builder, vec2, vec1, "ddxddyddxddy");

   else

      return LLVMBuildSub(builder, vec2, vec1, "ddxddyddxddy");

}

/**

 * Twiddle from quad format to row format

 *

 *   src0      src1

 * ######### #########      #################

 * # 0 | 1 # # 4 | 5 #      # 0 | 1 | 4 | 5 # src0

 * #---+---# #---+---#  ->  #################

 * # 2 | 3 # # 6 | 7 #      # 2 | 3 | 6 | 7 # src1

 * ######### #########      #################

 *

 */

void

lp_bld_quad_twiddle(struct gallivm_state *gallivm,

                    struct lp_type lp_dst_type,

                    const LLVMValueRef* src,

                    unsigned src_count,

                    LLVMValueRef* dst)

{

   LLVMBuilderRef builder = gallivm->builder;

   LLVMTypeRef dst_type_ref;

   LLVMTypeRef type2_ref;

   struct lp_type type2;

   unsigned i;

   assert((src_count % 2) == 0);

   /* Create a type with only 2 elements */

   type2 = lp_dst_type;

   type2.width = (lp_dst_type.width * lp_dst_type.length) / 2;

   type2.length = 2;

   type2.floating = 0;

   type2_ref = lp_build_vec_type(gallivm, type2);

   dst_type_ref = lp_build_vec_type(gallivm, lp_dst_type);

   for (i = 0; i < src_count; i += 2) {

      LLVMValueRef src0, src1;

      src0 = LLVMBuildBitCast(builder, src[i + 0], type2_ref, "");

      src1 = LLVMBuildBitCast(builder, src[i + 1], type2_ref, "");

      dst[i + 0] = lp_build_interleave2(gallivm, type2, src0, src1, 0);

      dst[i + 1] = lp_build_interleave2(gallivm, type2, src0, src1, 1);

      dst[i + 0] = LLVMBuildBitCast(builder, dst[i + 0], dst_type_ref, "");

      dst[i + 1] = LLVMBuildBitCast(builder, dst[i + 1], dst_type_ref, "");

   }

}