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/*
* Copyright © 2012 Linaro Limited
*
* This file is part of the glmark2 OpenGL (ES) 2.0 benchmark.
*
* glmark2 is free software: you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* glmark2 is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* glmark2. If not, see <http://www.gnu.org/licenses/>.
*
* Authors:
* Alexandros Frantzis <alexandros.frantzis@linaro.org>
*/
#include "gl-visual-config.h"
#include "util.h"
#include "log.h"
#include <vector>
GLVisualConfig::GLVisualConfig(const std::string &s) :
red(1), green(1), blue(1), alpha(1), depth(1), buffer(1)
{
std::vector<std::string> elems;
Util::split(s, ':', elems);
for (std::vector<std::string>::const_iterator iter = elems.begin();
iter != elems.end();
iter++)
{
std::vector<std::string> opt;
Util::split(*iter, '=', opt);
if (opt.size() == 2) {
if (opt[0] == "r" || opt[0] == "red")
red = Util::fromString<int>(opt[1]);
else if (opt[0] == "g" || opt[0] == "green")
green = Util::fromString<int>(opt[1]);
else if (opt[0] == "b" || opt[0] == "blue")
blue = Util::fromString<int>(opt[1]);
else if (opt[0] == "a" || opt[0] == "alpha")
alpha = Util::fromString<int>(opt[1]);
else if (opt[0] == "d" || opt[0] == "depth")
depth = Util::fromString<int>(opt[1]);
else if (opt[0] == "buf" || opt[0] == "buffer")
buffer = Util::fromString<int>(opt[1]);
}
else
Log::info("Warning: ignoring invalid option string '%s' "
"in GLVisualConfig description\n",
iter->c_str());
}
}
int
GLVisualConfig::match_score(const GLVisualConfig &target) const
{
int score(0);
/*
* R,G,B,A integer values are at most 8 bits wide (for current widespread
* hardware), so we need to scale them by 4 to get them in the [0,32] range.
*/
score += score_component(red, target.red, 4);
score += score_component(green, target.green, 4);
score += score_component(blue, target.blue, 4);
score += score_component(alpha, target.alpha, 4);
score += score_component(depth, target.depth, 1);
score += score_component(buffer, target.buffer, 1);
return score;
}
int
GLVisualConfig::score_component(int component, int target, int scale) const
{
/*
* The maximum (positive) score that can be returned is based
* on the maximum bit width of the components. We assume this to
* be 32 bits, which is a reasonable assumption for current platforms.
*/
static const int MAXIMUM_COMPONENT_SCORE = 32;
static const int UNACCEPTABLE_COMPONENT_PENALTY = -1000;
int score(0);
if ((component > 0 && target == 0) ||
(component == 0 && target > 0))
{
/*
* Penalize components that are not present but have been requested,
* and components that have been excluded but are present.
*/
score = UNACCEPTABLE_COMPONENT_PENALTY;
}
else if (component == target)
{
/* Reward exact matches with the maximum per component score */
score = MAXIMUM_COMPONENT_SCORE;
}
else
{
/*
* Reward deeper than requested component values, penalize shallower
* than requested component values. Because the ranges of component
* values vary we use a scaling factor to even them out, so that the
* score for all components ranges from [0,MAXIMUM_COMPONENT_SCORE).
*/
score = scale * (component - target);
}
return score;
}
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