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 35class ir_swizzle_swizzle_visitor : public ir_hierarchical_visitor { 36public: 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 47ir_visitor_status 48ir_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 */ 85bool 86do_swizzle_swizzle(exec_list *instructions) 87{ 88 ir_swizzle_swizzle_visitor v; 89 90 v.run(instructions); 91 92 return v.progress; 93} 94