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math: Move lerp function into SGMisc.

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This commit is contained in:
Mathias Froehlich 2012-03-03 11:56:40 +01:00
parent 9414874e1d
commit 57a3b0fd1e
4 changed files with 10 additions and 29 deletions
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1
simgear/math/CMakeLists.txt
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@ -2,7 +2,6 @@ include (SimGearComponent)
set(HEADERS
Math.hxx
SGBox.hxx
SGCMath.hxx
SGGeoc.hxx

23
simgear/math/Math.hxx
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@ -1,23 +0,0 @@
#ifndef SIMGEAR_MATH_MATH_HXX
#define SIMGEAR_MATH_MATH_HXX 1
namespace simgear
{
namespace math
{
/** Linear interpolation between two values.
*/
template<typename T>
inline T lerp(const T& x, const T& y, double alpha)
{
return x * (1.0 - alpha) + y * alpha;
}
template<typename T>
inline T lerp(const T& x, const T& y, float alpha)
{
return x * (1.0f - alpha) + y * alpha;
}
}
}
#endif

5
simgear/math/SGMisc.hxx
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@ -87,6 +87,11 @@ public:
static int roundToInt(const T& v)
{ return int(round(v)); }
// Linear interpolation between two arbitrary typed values
template<typename S>
static S lerp(const S& val0, const S& val1, const T& t)
{ return val0*(T(1) - t) + val1*t; }
#ifndef NDEBUG
/// Returns true if v is a NaN value
/// Use with care: allways code that you do not need to use that!

10
simgear/scene/sky/dome.cxx
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@ -40,7 +40,7 @@
#include <osg/CullFace>
#include <simgear/debug/logstream.hxx>
#include <simgear/math/Math.hxx>
#include <simgear/math/SGMath.hxx>
#include <simgear/scene/util/VectorArrayAdapter.hxx>
#include <simgear/scene/material/Effect.hxx>
#include <simgear/scene/material/EffectGeode.hxx>
@ -234,7 +234,7 @@ static void fade_to_black(osg::Vec3 sky_color[], float asl, int count) {
sky_color[i] *= d;
}
inline void clampColor(osg::Vec3& color)
static inline void clampColor(osg::Vec3& color)
{
color.x() = osg::clampTo(color.x(), 0.0f, 1.0f);
color.y() = osg::clampTo(color.y(), 0.0f, 1.0f);
@ -310,17 +310,17 @@ SGSkyDome::repaint( const SGVec3f& sun_color, const SGVec3f& sky_color,
int j=0;
// Color top half by linear interpolation (90...60 degrees)
for (; j < upperRings; j++)
colors(j, i) = simgear::math::lerp(toOsg(sky_color), colors(upperRings, i), j / (float)upperRings);
colors(j, i) = SGMiscf::lerp(toOsg(sky_color), colors(upperRings, i), j / (float)upperRings);
j++; // Skip the 60 deg ring
// From 60 to ~85 degrees
for (int l = 0; j < upperRings + middleRings + 1; j++, l++)
colors(j, i) = simgear::math::lerp(colors(upperRings, i),
colors(j, i) = SGMiscf::lerp(colors(upperRings, i),
toOsg(sky_color - middleVisFactor * diff + middle_amt), l / (float)middleRings);
// 85 to 90 degrees
for (int l = 0; j < halfRings; j++, l++)
colors(j, i) = simgear::math::lerp(colors(upperRings + middleRings, i), toOsg(fog_color + outer_amt),
colors(j, i) = SGMiscf::lerp(colors(upperRings + middleRings, i), toOsg(fog_color + outer_amt),
l / (float)(halfRings - upperRings - middleRings));
// Original colors