src/gallium/auxiliary/gallivm/lp_bld_quad.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2010 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 SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  18  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "lp_bld_type.h"
  30 #include "lp_bld_arit.h"
  31 #include "lp_bld_const.h"
  32 #include "lp_bld_swizzle.h"
  33 #include "lp_bld_quad.h"
  34 #include "lp_bld_pack.h"
  35
  36
  37 static const unsigned char
  38 swizzle_left[4] = {
  39    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_LEFT,
  40    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_LEFT
  41 };
  42
  43 static const unsigned char
  44 swizzle_right[4] = {
  45    LP_BLD_QUAD_TOP_RIGHT,    LP_BLD_QUAD_TOP_RIGHT,
  46    LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
  47 };
  48
  49 static const unsigned char
  50 swizzle_top[4] = {
  51    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT,
  52    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT
  53 };
  54
  55 static const unsigned char
  56 swizzle_bottom[4] = {
  57    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT,
  58    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT
  59 };
  60
  61
  62 LLVMValueRef
  63 lp_build_ddx(struct lp_build_context *bld,
  64              LLVMValueRef a)
  65 {
  66    LLVMValueRef a_left  = lp_build_swizzle_aos(bld, a, swizzle_left);
  67    LLVMValueRef a_right = lp_build_swizzle_aos(bld, a, swizzle_right);
  68    return lp_build_sub(bld, a_right, a_left);
  69 }
  70
  71
  72 LLVMValueRef
  73 lp_build_ddy(struct lp_build_context *bld,
  74              LLVMValueRef a)
  75 {
  76    LLVMValueRef a_top    = lp_build_swizzle_aos(bld, a, swizzle_top);
  77    LLVMValueRef a_bottom = lp_build_swizzle_aos(bld, a, swizzle_bottom);
  78    return lp_build_sub(bld, a_bottom, a_top);
  79 }
  80
  81 /*
  82  * Helper for building packed ddx/ddy vector for one coord (scalar per quad
  83  * values). The vector will look like this (8-wide):
  84  * dr1dx _____ -dr1dy _____ dr2dx _____ -dr2dy _____
  85  * This only requires one shuffle instead of two for more straightforward packing.
  86  */
  87 LLVMValueRef
  88 lp_build_packed_ddx_ddy_onecoord(struct lp_build_context *bld,
  89                                  LLVMValueRef a)
  90 {
  91    struct gallivm_state *gallivm = bld->gallivm;
  92    LLVMBuilderRef builder = gallivm->builder;
  93    LLVMValueRef vec1, vec2;
  94
  95    /* use aos swizzle helper */
  96
  97    static const unsigned char swizzle1[] = { /* no-op swizzle */
  98       LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE,
  99       LP_BLD_QUAD_BOTTOM_LEFT, LP_BLD_SWIZZLE_DONTCARE
 100    };
 101    static const unsigned char swizzle2[] = {
 102       LP_BLD_QUAD_TOP_RIGHT, LP_BLD_SWIZZLE_DONTCARE,
 103       LP_BLD_QUAD_TOP_LEFT, LP_BLD_SWIZZLE_DONTCARE
 104    };
 105
 106    vec1 = lp_build_swizzle_aos(bld, a, swizzle1);
 107    vec2 = lp_build_swizzle_aos(bld, a, swizzle2);
 108
 109    if (bld->type.floating)
 110       return LLVMBuildFSub(builder, vec2, vec1, "ddxddy");
 111    else
 112       return LLVMBuildSub(builder, vec2, vec1, "ddxddy");
 113 }
 114
 115
 116 /*
 117  * Helper for building packed ddx/ddy vector for one coord (scalar per quad
 118  * values). The vector will look like this (8-wide):
 119  * ds1dx ds1dy dt1dx dt1dy ds2dx ds2dy dt2dx dt2dy
 120  * This only needs 2 (v)shufps.
 121  */
 122 LLVMValueRef
 123 lp_build_packed_ddx_ddy_twocoord(struct lp_build_context *bld,
 124                                  LLVMValueRef a, LLVMValueRef b)
 125 {
 126    struct gallivm_state *gallivm = bld->gallivm;
 127    LLVMBuilderRef builder = gallivm->builder;
 128    LLVMValueRef shuffles1[LP_MAX_VECTOR_LENGTH/4];
 129    LLVMValueRef shuffles2[LP_MAX_VECTOR_LENGTH/4];
 130    LLVMValueRef vec1, vec2;
 131    unsigned length, num_quads, i;
 132
 133    /* XXX: do hsub version */
 134    length = bld->type.length;
 135    num_quads = length / 4;
 136    for (i = 0; i < num_quads; i++) {
 137       unsigned s1 = 4 * i;
 138       unsigned s2 = 4 * i + length;
 139       shuffles1[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
 140       shuffles1[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s1);
 141       shuffles1[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
 142       shuffles1[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_LEFT + s2);
 143       shuffles2[4*i + 0] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s1);
 144       shuffles2[4*i + 1] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s1);
 145       shuffles2[4*i + 2] = lp_build_const_int32(gallivm, LP_BLD_QUAD_TOP_RIGHT + s2);
 146       shuffles2[4*i + 3] = lp_build_const_int32(gallivm, LP_BLD_QUAD_BOTTOM_LEFT + s2);
 147    }
 148    vec1 = LLVMBuildShuffleVector(builder, a, b,
 149                                  LLVMConstVector(shuffles1, length), "");
 150    vec2 = LLVMBuildShuffleVector(builder, a, b,
 151                                  LLVMConstVector(shuffles2, length), "");
 152    if (bld->type.floating)
 153       return LLVMBuildFSub(builder, vec2, vec1, "ddxddyddxddy");
 154    else
 155       return LLVMBuildSub(builder, vec2, vec1, "ddxddyddxddy");
 156 }
 157
 158
 159 /**
 160  * Twiddle from quad format to row format
 161  *
 162  *   src0      src1
 163  * ######### #########      #################
 164  * # 0 | 1 # # 4 | 5 #      # 0 | 1 | 4 | 5 # src0
 165  * #---+---# #---+---#  ->  #################
 166  * # 2 | 3 # # 6 | 7 #      # 2 | 3 | 6 | 7 # src1
 167  * ######### #########      #################
 168  *
 169  */
 170 void
 171 lp_bld_quad_twiddle(struct gallivm_state *gallivm,
 172                     struct lp_type lp_dst_type,
 173                     const LLVMValueRef* src,
 174                     unsigned src_count,
 175                     LLVMValueRef* dst)
 176 {
 177    LLVMBuilderRef builder = gallivm->builder;
 178    LLVMTypeRef dst_type_ref;
 179    LLVMTypeRef type2_ref;
 180    struct lp_type type2;
 181    unsigned i;
 182
 183    assert((src_count % 2) == 0);
 184
 185    /* Create a type with only 2 elements */
 186    type2 = lp_dst_type;
 187    type2.width = (lp_dst_type.width * lp_dst_type.length) / 2;
 188    type2.length = 2;
 189    type2.floating = 0;
 190
 191    type2_ref = lp_build_vec_type(gallivm, type2);
 192    dst_type_ref = lp_build_vec_type(gallivm, lp_dst_type);
 193
 194    for (i = 0; i < src_count; i += 2) {
 195       LLVMValueRef src0, src1;
 196
 197       src0 = LLVMBuildBitCast(builder, src[i + 0], type2_ref, "");
 198       src1 = LLVMBuildBitCast(builder, src[i + 1], type2_ref, "");
 199
 200       dst[i + 0] = lp_build_interleave2(gallivm, type2, src0, src1, 0);
 201       dst[i + 1] = lp_build_interleave2(gallivm, type2, src0, src1, 1);
 202
 203       dst[i + 0] = LLVMBuildBitCast(builder, dst[i + 0], dst_type_ref, "");
 204       dst[i + 1] = LLVMBuildBitCast(builder, dst[i + 1], dst_type_ref, "");
 205    }
 206 }