70 lines
1.6 KiB
C#
70 lines
1.6 KiB
C#
|
using System.Collections.Generic;
|
||
|
|
using UnityEngine;
|
||
|
|
|
||
|
|
public class e2dMidpoint
|
||
|
|
{
|
||
|
|
private float[] mCells;
|
||
|
|
|
||
|
|
private int mInitialCellCount;
|
||
|
|
|
||
|
|
private int mInitialStep;
|
||
|
|
|
||
|
|
private float mRoughness;
|
||
|
|
|
||
|
|
private List<Vector2> mPeaks;
|
||
|
|
|
||
|
|
public e2dMidpoint(int cellCount, int initialStep, float roughness, List<Vector2> peaks)
|
||
|
|
{
|
||
|
|
mRoughness = roughness;
|
||
|
|
mInitialCellCount = cellCount;
|
||
|
|
cellCount = Mathf.NextPowerOfTwo(cellCount - 1) + 1;
|
||
|
|
mCells = new float[cellCount];
|
||
|
|
mInitialStep = Mathf.ClosestPowerOfTwo(initialStep);
|
||
|
|
mInitialStep = Mathf.Clamp(mInitialStep, 1, cellCount - 1);
|
||
|
|
mPeaks = peaks;
|
||
|
|
}
|
||
|
|
|
||
|
|
public void Regenerate()
|
||
|
|
{
|
||
|
|
int num = mInitialStep;
|
||
|
|
float num2 = 0.9f;
|
||
|
|
float num3 = Mathf.Pow(2f, Mathf.Lerp(e2dConstants.MIDPOINT_ROUGHNESS_POWER_MIN, e2dConstants.MIDPOINT_ROUGHNESS_POWER_MAX, mRoughness));
|
||
|
|
for (int i = 0; i < mCells.Length; i++)
|
||
|
|
{
|
||
|
|
mCells[i] = -1f;
|
||
|
|
}
|
||
|
|
for (int j = 0; j < mCells.Length; j += mInitialStep)
|
||
|
|
{
|
||
|
|
mCells[j] = 0.5f - 0.5f * num2 + Random.value * num2;
|
||
|
|
}
|
||
|
|
num2 *= num3;
|
||
|
|
if (mPeaks != null)
|
||
|
|
{
|
||
|
|
foreach (Vector2 mPeak in mPeaks)
|
||
|
|
{
|
||
|
|
int num4 = Mathf.RoundToInt(mPeak.x * (float)(mInitialCellCount - 1) / (float)mInitialStep);
|
||
|
|
num4 *= mInitialStep;
|
||
|
|
mCells[num4] = mPeak.y;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
while (num > 1)
|
||
|
|
{
|
||
|
|
for (int k = 0; k + num < mCells.Length; k += num)
|
||
|
|
{
|
||
|
|
int num5 = k + (num >> 1);
|
||
|
|
int num6 = k + num;
|
||
|
|
float num7 = 0.5f * (mCells[k] + mCells[num6]);
|
||
|
|
num7 += -0.5f * num2 + Random.value * num2;
|
||
|
|
mCells[num5] = num7;
|
||
|
|
}
|
||
|
|
num >>= 1;
|
||
|
|
num2 *= num3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
public float GetValueAt(int i)
|
||
|
|
{
|
||
|
|
return mCells[i];
|
||
|
|
}
|
||
|
|
}
|