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/*
* Copyright © 2012-2021 VMware, Inc.
*
* 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.
*/
#pragma once
#include <vector>
#include "value.h"
namespace glsl
{
class Selector
{
public:
enum Channels {
X,
Y,
Z,
W,
NONE
};
static const Selector x;
static const Selector y;
static const Selector z;
static const Selector w;
static const Selector xy;
static const Selector xyzw;
public:
Selector()
{
}
Selector(const std::vector<Channels>& src)
: mMask(src)
{
}
Selector(const Value& v)
{
for (size_t i = 0; i < v.size(); ++i)
add((Channels)i);
}
Selector(Channels c1)
{
add(c1);
}
Selector(Channels c1, Channels c2)
{
add(c1);
add(c2);
}
Selector(Channels c1, Channels c2, Channels c3)
{
add(c1);
add(c2);
add(c3);
}
Selector(Channels c1, Channels c2, Channels c3, Channels c4)
{
add(c1);
add(c2);
add(c3);
add(c4);
}
void add(Channels c)
{
if (c == NONE)
return;
mMask.push_back(c);
}
Value select(const Value& in) const
{
Value out;
for (std::vector<Channels>::const_iterator itr = mMask.begin(); itr != mMask.end(); ++itr)
out.add(in[*itr]);
return out;
}
Value select(const Value& left, const Value& right) const
{
assert(right.size() == mMask.size());
Value out = left;
for (size_t i = 0; i < mMask.size(); ++i)
out[mMask.at(i)] = right[i];
return out;
}
std::string toString() const
{
static const char* name[] = { "x", "y", "z", "w" };
std::string str;
for (size_t i = 0; i < mMask.size(); ++i)
str += name[mMask.at(i)];
if (str.compare("xyzw") == 0)
return std::string();
else
return str;
}
const std::vector<Channels>& mask() const
{
return mMask;
}
private:
std::vector<Channels> mMask;
};
}
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