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  1. /*
  2.  * Copyright © 2010 Intel Corporation
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person obtaining a
  5.  * copy of this software and associated documentation files (the "Software"),
  6.  * to deal in the Software without restriction, including without limitation
  7.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  8.  * and/or sell copies of the Software, and to permit persons to whom the
  9.  * Software is furnished to do so, subject to the following conditions:
  10.  *
  11.  * The above copyright notice and this permission notice (including the next
  12.  * paragraph) shall be included in all copies or substantial portions of the
  13.  * Software.
  14.  *
  15.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21.  * DEALINGS IN THE SOFTWARE.
  22.  */
  23.  
  24. /**
  25.  * \file opt_swizzle_swizzle.cpp
  26.  *
  27.  * Eliminates the second swizzle in a swizzle chain.
  28.  */
  29.  
  30. #include "ir.h"
  31. #include "ir_visitor.h"
  32. #include "ir_optimization.h"
  33. #include "glsl_types.h"
  34.  
  35. class ir_swizzle_swizzle_visitor : public ir_hierarchical_visitor {
  36. public:
  37.    ir_swizzle_swizzle_visitor()
  38.    {
  39.       progress = false;
  40.    }
  41.  
  42.    virtual ir_visitor_status visit_enter(ir_swizzle *);
  43.  
  44.    bool progress;
  45. };
  46.  
  47. ir_visitor_status
  48. ir_swizzle_swizzle_visitor::visit_enter(ir_swizzle *ir)
  49. {
  50.    int mask2[4];
  51.  
  52.    ir_swizzle *swiz2 = ir->val->as_swizzle();
  53.    if (!swiz2)
  54.       return visit_continue;
  55.  
  56.    memset(&mask2, 0, sizeof(mask2));
  57.    if (swiz2->mask.num_components >= 1)
  58.       mask2[0] = swiz2->mask.x;
  59.    if (swiz2->mask.num_components >= 2)
  60.       mask2[1] = swiz2->mask.y;
  61.    if (swiz2->mask.num_components >= 3)
  62.       mask2[2] = swiz2->mask.z;
  63.    if (swiz2->mask.num_components >= 4)
  64.       mask2[3] = swiz2->mask.w;
  65.  
  66.    if (ir->mask.num_components >= 1)
  67.       ir->mask.x = mask2[ir->mask.x];
  68.    if (ir->mask.num_components >= 2)
  69.       ir->mask.y = mask2[ir->mask.y];
  70.    if (ir->mask.num_components >= 3)
  71.       ir->mask.z = mask2[ir->mask.z];
  72.    if (ir->mask.num_components >= 4)
  73.       ir->mask.w = mask2[ir->mask.w];
  74.  
  75.    ir->val = swiz2->val;
  76.  
  77.    this->progress = true;
  78.  
  79.    return visit_continue;
  80. }
  81.  
  82. /**
  83.  * Does a copy propagation pass on the code present in the instruction stream.
  84.  */
  85. bool
  86. do_swizzle_swizzle(exec_list *instructions)
  87. {
  88.    ir_swizzle_swizzle_visitor v;
  89.  
  90.    v.run(instructions);
  91.  
  92.    return v.progress;
  93. }
  94.