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