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,
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  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
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  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
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  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
  35
  36 static const unsigned char
  37 swizzle_left[4] = {
  38    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_LEFT,
  39    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_LEFT
  40 };
  41
  42 static const unsigned char
  43 swizzle_right[4] = {
  44    LP_BLD_QUAD_TOP_RIGHT,    LP_BLD_QUAD_TOP_RIGHT,
  45    LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
  46 };
  47
  48 static const unsigned char
  49 swizzle_top[4] = {
  50    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT,
  51    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT
  52 };
  53
  54 static const unsigned char
  55 swizzle_bottom[4] = {
  56    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT,
  57    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT
  58 };
  59
  60
  61 LLVMValueRef
  62 lp_build_ddx(struct lp_build_context *bld,
  63              LLVMValueRef a)
  64 {
  65    LLVMValueRef a_left  = lp_build_swizzle_aos(bld, a, swizzle_left);
  66    LLVMValueRef a_right = lp_build_swizzle_aos(bld, a, swizzle_right);
  67    return lp_build_sub(bld, a_right, a_left);
  68 }
  69
  70
  71 LLVMValueRef
  72 lp_build_ddy(struct lp_build_context *bld,
  73              LLVMValueRef a)
  74 {
  75    LLVMValueRef a_top    = lp_build_swizzle_aos(bld, a, swizzle_top);
  76    LLVMValueRef a_bottom = lp_build_swizzle_aos(bld, a, swizzle_bottom);
  77    return lp_build_sub(bld, a_bottom, a_top);
  78 }
  79
  80
  81 LLVMValueRef
  82 lp_build_scalar_ddx(struct lp_build_context *bld,
  83                     LLVMValueRef a)
  84 {
  85    LLVMBuilderRef builder = bld->gallivm->builder;
  86    LLVMValueRef idx_left  = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_LEFT);
  87    LLVMValueRef idx_right = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_RIGHT);
  88    LLVMValueRef a_left  = LLVMBuildExtractElement(builder, a, idx_left, "left");
  89    LLVMValueRef a_right = LLVMBuildExtractElement(builder, a, idx_right, "right");
  90    if (bld->type.floating)
  91       return LLVMBuildFSub(builder, a_right, a_left, "ddx");
  92    else
  93       return LLVMBuildSub(builder, a_right, a_left, "ddx");
  94 }
  95
  96
  97 LLVMValueRef
  98 lp_build_scalar_ddy(struct lp_build_context *bld,
  99                     LLVMValueRef a)
 100 {
 101    LLVMBuilderRef builder = bld->gallivm->builder;
 102    LLVMValueRef idx_top    = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_TOP_LEFT);
 103    LLVMValueRef idx_bottom = lp_build_const_int32(bld->gallivm, LP_BLD_QUAD_BOTTOM_LEFT);
 104    LLVMValueRef a_top    = LLVMBuildExtractElement(builder, a, idx_top, "top");
 105    LLVMValueRef a_bottom = LLVMBuildExtractElement(builder, a, idx_bottom, "bottom");
 106    if (bld->type.floating)
 107       return LLVMBuildFSub(builder, a_bottom, a_top, "ddy");
 108    else
 109       return LLVMBuildSub(builder, a_bottom, a_top, "ddy");
 110 }