mirror of https://gitlab.freedesktop.org/mesa/mesa
94 lines
2.6 KiB
C++
94 lines
2.6 KiB
C++
/*
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* Copyright © 2010 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* \file ir_swizzle_swizzle.cpp
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*
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* Eliminates the second swizzle in a swizzle chain.
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*/
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#include "ir.h"
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#include "ir_visitor.h"
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#include "ir_optimization.h"
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#include "glsl_types.h"
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class ir_swizzle_swizzle_visitor : public ir_hierarchical_visitor {
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public:
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ir_swizzle_swizzle_visitor()
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{
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progress = false;
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}
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virtual ir_visitor_status visit_enter(ir_swizzle *);
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bool progress;
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};
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ir_visitor_status
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ir_swizzle_swizzle_visitor::visit_enter(ir_swizzle *ir)
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{
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int mask2[4];
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ir_swizzle *swiz2 = ir->val->as_swizzle();
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if (!swiz2)
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return visit_continue;
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memset(&mask2, 0, sizeof(mask2));
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if (swiz2->mask.num_components >= 1)
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mask2[0] = swiz2->mask.x;
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if (swiz2->mask.num_components >= 2)
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mask2[1] = swiz2->mask.y;
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if (swiz2->mask.num_components >= 3)
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mask2[2] = swiz2->mask.z;
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if (swiz2->mask.num_components >= 4)
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mask2[3] = swiz2->mask.w;
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if (ir->mask.num_components >= 1)
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ir->mask.x = mask2[ir->mask.x];
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if (ir->mask.num_components >= 2)
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ir->mask.y = mask2[ir->mask.y];
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if (ir->mask.num_components >= 3)
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ir->mask.z = mask2[ir->mask.z];
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if (ir->mask.num_components >= 4)
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ir->mask.w = mask2[ir->mask.w];
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ir->val = swiz2->val;
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this->progress = true;
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return visit_continue;
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}
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/**
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* Does a copy propagation pass on the code present in the instruction stream.
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*/
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bool
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do_swizzle_swizzle(exec_list *instructions)
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{
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ir_swizzle_swizzle_visitor v;
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v.run(instructions);
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return v.progress;
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}
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