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_swizzle.h"
  32 #include "lp_bld_quad.h"
  33
  34
  35 static const unsigned char
  36 swizzle_left[4] = {
  37    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_LEFT,
  38    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_LEFT
  39 };
  40
  41 static const unsigned char
  42 swizzle_right[4] = {
  43    LP_BLD_QUAD_TOP_RIGHT,    LP_BLD_QUAD_TOP_RIGHT,
  44    LP_BLD_QUAD_BOTTOM_RIGHT, LP_BLD_QUAD_BOTTOM_RIGHT
  45 };
  46
  47 static const unsigned char
  48 swizzle_top[4] = {
  49    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT,
  50    LP_BLD_QUAD_TOP_LEFT,     LP_BLD_QUAD_TOP_RIGHT
  51 };
  52
  53 static const unsigned char
  54 swizzle_bottom[4] = {
  55    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT,
  56    LP_BLD_QUAD_BOTTOM_LEFT,  LP_BLD_QUAD_BOTTOM_RIGHT
  57 };
  58
  59
  60 LLVMValueRef
  61 lp_build_ddx(struct lp_build_context *bld,
  62              LLVMValueRef a)
  63 {
  64    LLVMValueRef a_left  = lp_build_swizzle_aos(bld, a, swizzle_left);
  65    LLVMValueRef a_right = lp_build_swizzle_aos(bld, a, swizzle_right);
  66    return lp_build_sub(bld, a_right, a_left);
  67 }
  68
  69
  70 LLVMValueRef
  71 lp_build_ddy(struct lp_build_context *bld,
  72              LLVMValueRef a)
  73 {
  74    LLVMValueRef a_top    = lp_build_swizzle_aos(bld, a, swizzle_top);
  75    LLVMValueRef a_bottom = lp_build_swizzle_aos(bld, a, swizzle_bottom);
  76    return lp_build_sub(bld, a_bottom, a_top);
  77 }
  78
  79
  80 LLVMValueRef
  81 lp_build_scalar_ddx(struct lp_build_context *bld,
  82                     LLVMValueRef a)
  83 {
  84    LLVMValueRef idx_left  = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_LEFT, 0);
  85    LLVMValueRef idx_right = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_RIGHT, 0);
  86    LLVMValueRef a_left  = LLVMBuildExtractElement(bld->builder, a, idx_left, "");
  87    LLVMValueRef a_right = LLVMBuildExtractElement(bld->builder, a, idx_right, "");
  88    return lp_build_sub(bld, a_right, a_left);
  89 }
  90
  91
  92 LLVMValueRef
  93 lp_build_scalar_ddy(struct lp_build_context *bld,
  94                     LLVMValueRef a)
  95 {
  96    LLVMValueRef idx_top    = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_TOP_LEFT, 0);
  97    LLVMValueRef idx_bottom = LLVMConstInt(LLVMInt32Type(), LP_BLD_QUAD_BOTTOM_LEFT, 0);
  98    LLVMValueRef a_top    = LLVMBuildExtractElement(bld->builder, a, idx_top, "");
  99    LLVMValueRef a_bottom = LLVMBuildExtractElement(bld->builder, a, idx_bottom, "");
 100    return lp_build_sub(bld, a_bottom, a_top);
 101 }