/// <summary>
/// 渲染
/// </summary>
/// <returns>Bitmap:渲染完成的位图</returns>
public unsafe Bitmap Render()
{
int w = _bmpTexture.Width;
int h = _bmpTexture.Height;
// 锁定位图数据
BitmapData fdat = _bmpFrame.LockBits(new Rectangle(0, 0, _bmpTexture.Width, _bmpTexture.Height),
ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
BitmapData tdat = _bmpTexture.LockBits(new Rectangle(0, 0, _bmpTexture.Width, _bmpTexture.Height),
ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
// 固定当前帧浪高缓冲区
fixed(int *buffer = _frontBuffer)
{
// 获取位图数据指针
byte *faddr = (byte *)fdat.Scan0;
byte *taddr = (byte *)tdat.Scan0;
for (int i = w; i < w * h - w; i++)
{
// 计算XY偏移(根据浪高把偏移位置的像素设置到当前位置)
int xo = buffer[i - 1] - buffer[i + 1];
int yo = buffer[i - w] - buffer[i + w];
// 根据偏移生成阴影着色
int shade = (xo - yo) / 4;
// 获取基准像素的坐标
int pxi = i * 3 + (tdat.Stride - w * 3) * (i / (tdat.Stride / 3));
int fxi = pxi + xo * 3 + yo * tdat.Stride;
if (fxi < 0)
{
fxi = pxi;
}
if (fxi >= w * h * 3)
{
fxi = pxi;
}
// 从材质获取基准像素
byte b = taddr[fxi];
byte g = taddr[fxi + 1];
byte r = taddr[fxi + 2];
// 着色
b = (byte)CommonUtility.CoerceValue(b + shade, 0, 255);
g = (byte)CommonUtility.CoerceValue(g + shade, 0, 255);
r = (byte)CommonUtility.CoerceValue(r + shade, 0, 255);
// 生成水波
faddr[pxi] = b;
faddr[pxi + 1] = g;
faddr[pxi + 2] = r;
}
// 复制首尾行像素
for (int i = 0; i < w * 3; i++)
{
faddr[w * h * 3 - i - 1] = taddr[w * h * 3 - i - 1];
faddr[i] = taddr[i];
}
}
// 解锁位图数据
_bmpFrame.UnlockBits(fdat);
_bmpTexture.UnlockBits(tdat);
return(_bmpFrame);
}