/
TerrainSplat.cs
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/
TerrainSplat.cs
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// The contents of this file were copied from the source of OpenSimulator and modified
// and contained the following copyright notice:
/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Imaging;
using log4net;
using OpenMetaverse;
//using OpenSim.Framework;
//using OpenSim.Region.Framework.Interfaces;
//using OpenSim.Services.Interfaces;
//namespace OpenSim.Region.CoreModules.World.Warp3DMap
namespace OpenMetaverse.TestClient
{
public static class TerrainSplat
{
#region Constants
private static readonly UUID DIRT_DETAIL = new UUID("0bc58228-74a0-7e83-89bc-5c23464bcec5");
private static readonly UUID GRASS_DETAIL = new UUID("63338ede-0037-c4fd-855b-015d77112fc8");
private static readonly UUID MOUNTAIN_DETAIL = new UUID("303cd381-8560-7579-23f1-f0a880799740");
private static readonly UUID ROCK_DETAIL = new UUID("53a2f406-4895-1d13-d541-d2e3b86bc19c");
private static readonly UUID[] DEFAULT_TERRAIN_DETAIL = new UUID[]
{
DIRT_DETAIL,
GRASS_DETAIL,
MOUNTAIN_DETAIL,
ROCK_DETAIL
};
private static readonly Color[] DEFAULT_TERRAIN_COLOR = new Color[]
{
Color.FromArgb(255, 164, 136, 117),
Color.FromArgb(255, 65, 87, 47),
Color.FromArgb(255, 157, 145, 131),
Color.FromArgb(255, 125, 128, 130)
};
private static readonly UUID TERRAIN_CACHE_MAGIC = new UUID("2c0c7ef2-56be-4eb8-aacb-76712c535b4b");
#endregion Constants
private static readonly ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType.Name);
private static string LogHeader = "[WARP3D TERRAIN SPLAT]";
/// <summary>
/// Builds a composited terrain texture given the region texture
/// and heightmap settings
/// </summary>
/// <param name="terrain">Terrain heightmap</param>
/// <param name="regionInfo">Region information including terrain texture parameters</param>
/// <returns>A 256x256 square RGB texture ready for rendering</returns>
/// <remarks>Based on the algorithm described at http://opensimulator.org/wiki/Terrain_Splatting
/// Note we create a 256x256 dimension texture even if the actual terrain is larger.
/// </remarks>
public static Bitmap Splat(/*ITerrainChannel terrain,*/ double[,] terrain,
/*UUID[] textureIDs,*/ Bitmap[] textures, float[] startHeights, float[] heightRanges,
Vector3d regionPosition/*, IAssetService assetService, */ /*bool textureTerrain*/)
{
// Debug.Assert(textureIDs.Length == 4);
Debug.Assert(textures.Length == 4);
Debug.Assert(startHeights.Length == 4);
Debug.Assert(heightRanges.Length == 4);
Bitmap[] detailTexture = new Bitmap[4];
Array.Copy(textures, detailTexture, 4);
// if (textureTerrain)
// {
// // Swap empty terrain textureIDs with default IDs
// for (int i = 0; i < textureIDs.Length; i++)
// {
// if (textureIDs[i] == UUID.Zero)
// textureIDs[i] = DEFAULT_TERRAIN_DETAIL[i];
// }
// #region Texture Fetching
// if (assetService != null)
// {
// for (int i = 0; i < 4; i++)
// {
// AssetBase asset;
// UUID cacheID = UUID.Combine(TERRAIN_CACHE_MAGIC, textureIDs[i]);
// // Try to fetch a cached copy of the decoded/resized version of this texture
// asset = assetService.GetCached(cacheID.ToString());
// if (asset != null)
// {
// try
// {
// using (System.IO.MemoryStream stream = new System.IO.MemoryStream(asset.Data))
// detailTexture[i] = (Bitmap)Image.FromStream(stream);
// }
// catch (Exception ex)
// {
// m_log.Warn("Failed to decode cached terrain texture " + cacheID +
// " (textureID: " + textureIDs[i] + "): " + ex.Message);
// }
// }
// if (detailTexture[i] == null)
// {
// // Try to fetch the original JPEG2000 texture, resize if needed, and cache as PNG
// asset = assetService.Get(textureIDs[i].ToString());
// if (asset != null)
// {
//// m_log.DebugFormat(
//// "[TERRAIN SPLAT]: Got cached original JPEG2000 terrain texture {0} {1}", i, asset.ID);
// try { detailTexture[i] = (Bitmap)CSJ2K.J2kImage.FromBytes(asset.Data); }
// catch (Exception ex)
// {
// m_log.Warn("Failed to decode terrain texture " + asset.ID + ": " + ex.Message);
// }
// }
// if (detailTexture[i] != null)
// {
// // Make sure this texture is the correct size, otherwise resize
// if (detailTexture[i].Width != 256 || detailTexture[i].Height != 256)
// {
// using (Bitmap origBitmap = detailTexture[i])
// {
// detailTexture[i] = ImageUtils.ResizeImage(origBitmap, 256, 256);
// }
// }
// // Save the decoded and resized texture to the cache
// byte[] data;
// using (System.IO.MemoryStream stream = new System.IO.MemoryStream())
// {
// detailTexture[i].Save(stream, ImageFormat.Png);
// data = stream.ToArray();
// }
// // Cache a PNG copy of this terrain texture
// AssetBase newAsset = new AssetBase
// {
// Data = data,
// Description = "PNG",
// Flags = AssetFlags.Collectable,
// FullID = cacheID,
// ID = cacheID.ToString(),
// Local = true,
// Name = String.Empty,
// Temporary = true,
// Type = (sbyte)AssetType.Unknown
// };
// newAsset.Metadata.ContentType = "image/png";
// assetService.Store(newAsset);
// }
// }
// }
// }
// #endregion Texture Fetching
// }
// Fill in any missing textures with a solid color
for (int i = 0; i < 4; i++)
{
if (detailTexture[i] == null)
{
m_log.DebugFormat("{0} Missing terrain texture for layer {1}. Filling with solid default color",
LogHeader, i);
// Create a solid color texture for this layer
detailTexture[i] = new Bitmap(256, 256, PixelFormat.Format24bppRgb);
using (Graphics gfx = Graphics.FromImage(detailTexture[i]))
{
using (SolidBrush brush = new SolidBrush(DEFAULT_TERRAIN_COLOR[i]))
gfx.FillRectangle(brush, 0, 0, 256, 256);
}
}
else
{
if (detailTexture[i].Width != 256 || detailTexture[i].Height != 256)
{
detailTexture[i] = ResizeBitmap(detailTexture[i], 256, 256);
}
}
}
#region Layer Map
float[,] layermap = new float[256, 256];
// Scale difference between actual region size and the 256 texture being created
//int xFactor = terrain.Width / 256;
//int yFactor = terrain.Height / 256;
int xFactor = 1;
int yFactor = 1;
// Create 'layermap' where each value is the fractional layer number to place
// at that point. For instance, a value of 1.345 gives the blending of
// layer 1 and layer 2 for that point.
for (int y = 0; y < 256; y++)
{
for (int x = 0; x < 256; x++)
{
float height = (float)terrain[x * xFactor, y * yFactor];
float pctX = (float)x / 255f;
float pctY = (float)y / 255f;
// Use bilinear interpolation between the four corners of start height and
// height range to select the current values at this position
float startHeight = Bilinear(
startHeights[0],
startHeights[2],
startHeights[1],
startHeights[3],
pctX, pctY);
startHeight = Utils.Clamp(startHeight, 0f, 255f);
float heightRange = Bilinear(
heightRanges[0],
heightRanges[2],
heightRanges[1],
heightRanges[3],
pctX, pctY);
heightRange = Utils.Clamp(heightRange, 0f, 255f);
// Generate two frequencies of perlin noise based on our global position
// The magic values were taken from http://opensimulator.org/wiki/Terrain_Splatting
Vector3 vec = new Vector3
(
((float)regionPosition.X + (x * xFactor)) * 0.20319f,
((float)regionPosition.Y + (y * yFactor)) * 0.20319f,
height * 0.25f
);
float lowFreq = noise2(vec.X * 0.222222f, vec.Y * 0.222222f) * 6.5f;
float highFreq = turbulence2(vec.X, vec.Y, 2f) * 2.25f;
float noise = (lowFreq + highFreq) * 2f;
// Combine the current height, generated noise, start height, and height range parameters, then scale all of it
float layer = ((height + noise - startHeight) / heightRange) * 4f;
if (Single.IsNaN(layer))
layer = 0f;
layermap[x, y] = Utils.Clamp(layer, 0f, 3f);
}
}
#endregion Layer Map
#region Texture Compositing
Bitmap output = new Bitmap(256, 256, PixelFormat.Format24bppRgb);
BitmapData outputData = output.LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
// Unsafe work as we lock down the source textures for quicker access and access the
// pixel data directly
unsafe
{
// Get handles to all of the texture data arrays
BitmapData[] datas = new BitmapData[]
{
detailTexture[0].LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.ReadOnly, detailTexture[0].PixelFormat),
detailTexture[1].LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.ReadOnly, detailTexture[1].PixelFormat),
detailTexture[2].LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.ReadOnly, detailTexture[2].PixelFormat),
detailTexture[3].LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.ReadOnly, detailTexture[3].PixelFormat)
};
// Compute size of each pixel data (used to address into the pixel data array)
int[] comps = new int[]
{
(datas[0].PixelFormat == PixelFormat.Format32bppArgb) ? 4 : 3,
(datas[1].PixelFormat == PixelFormat.Format32bppArgb) ? 4 : 3,
(datas[2].PixelFormat == PixelFormat.Format32bppArgb) ? 4 : 3,
(datas[3].PixelFormat == PixelFormat.Format32bppArgb) ? 4 : 3
};
for (int y = 0; y < 256; y++)
{
for (int x = 0; x < 256; x++)
{
float layer = layermap[x, y];
// Select two textures
int l0 = (int)Math.Floor(layer);
int l1 = Math.Min(l0 + 1, 3);
byte* ptrA = (byte*)datas[l0].Scan0 + y * datas[l0].Stride + x * comps[l0];
byte* ptrB = (byte*)datas[l1].Scan0 + y * datas[l1].Stride + x * comps[l1];
byte* ptrO = (byte*)outputData.Scan0 + y * outputData.Stride + x * 3;
float aB = *(ptrA + 0);
float aG = *(ptrA + 1);
float aR = *(ptrA + 2);
float bB = *(ptrB + 0);
float bG = *(ptrB + 1);
float bR = *(ptrB + 2);
float layerDiff = layer - l0;
// Interpolate between the two selected textures
*(ptrO + 0) = (byte)Math.Floor(aB + layerDiff * (bB - aB));
*(ptrO + 1) = (byte)Math.Floor(aG + layerDiff * (bG - aG));
*(ptrO + 2) = (byte)Math.Floor(aR + layerDiff * (bR - aR));
}
}
for (int i = 0; i < detailTexture.Length; i++)
detailTexture[i].UnlockBits(datas[i]);
}
for (int i = 0; i < detailTexture.Length; i++)
if (detailTexture[i] != null)
detailTexture[i].Dispose();
output.UnlockBits(outputData);
// We generated the texture upside down, so flip it
output.RotateFlip(RotateFlipType.RotateNoneFlipY);
#endregion Texture Compositing
return output;
}
public static Bitmap ResizeBitmap(Bitmap b, int nWidth, int nHeight)
{
m_log.DebugFormat("{0} ResizeBitmap. From <{1},{2}> to <{3},{4}>",
LogHeader, b.Width, b.Height, nWidth, nHeight);
Bitmap result = new Bitmap(nWidth, nHeight);
using (Graphics g = Graphics.FromImage(result))
g.DrawImage(b, 0, 0, nWidth, nHeight);
b.Dispose();
return result;
}
//public static Bitmap SplatSimple(float[] heightmap)
//{
// const float BASE_HSV_H = 93f / 360f;
// const float BASE_HSV_S = 44f / 100f;
// const float BASE_HSV_V = 34f / 100f;
// Bitmap img = new Bitmap(256, 256);
// BitmapData bitmapData = img.LockBits(new Rectangle(0, 0, 256, 256), ImageLockMode.WriteOnly, PixelFormat.Format24bppRgb);
// unsafe
// {
// for (int y = 255; y >= 0; y--)
// {
// for (int x = 0; x < 256; x++)
// {
// float normHeight = heightmap[y * 256 + x] / 255f;
// normHeight = Utils.Clamp(normHeight, BASE_HSV_V, 1.0f);
// Color4 color = Color4.FromHSV(BASE_HSV_H, BASE_HSV_S, normHeight);
// byte* ptr = (byte*)bitmapData.Scan0 + y * bitmapData.Stride + x * 3;
// *(ptr + 0) = (byte)(color.B * 255f);
// *(ptr + 1) = (byte)(color.G * 255f);
// *(ptr + 2) = (byte)(color.R * 255f);
// }
// }
// }
// img.UnlockBits(bitmapData);
// return img;
//}
static float Bilinear(float v00, float v01, float v10, float v11, float xPercent, float yPercent)
{
return Utils.Lerp(Utils.Lerp(v00, v01, xPercent), Utils.Lerp(v10, v11, xPercent), yPercent);
}
// perlin stuffs
// We use a hardcoded seed to keep the noise generation consistent between runs
private const int SEED = 42;
private const int SAMPLE_SIZE = 1024;
private const int B = SAMPLE_SIZE;
private const int BM = SAMPLE_SIZE - 1;
private const int N = 0x1000;
private static readonly int[] p = new int[SAMPLE_SIZE + SAMPLE_SIZE + 2];
private static readonly float[,] g3 = new float[SAMPLE_SIZE + SAMPLE_SIZE + 2, 3];
private static readonly float[,] g2 = new float[SAMPLE_SIZE + SAMPLE_SIZE + 2, 2];
private static readonly float[] g1 = new float[SAMPLE_SIZE + SAMPLE_SIZE + 2];
static float noise2(float x, float y)
{
int bx0, bx1, by0, by1, b00, b10, b01, b11;
float rx0, rx1, ry0, ry1, sx, sy, a, b, t, u, v;
int i, j;
t = x + N;
bx0 = ((int)t) & BM;
bx1 = (bx0 + 1) & BM;
rx0 = t - (int)t;
rx1 = rx0 - 1f;
t = y + N;
by0 = ((int)t) & BM;
by1 = (by0 + 1) & BM;
ry0 = t - (int)t;
ry1 = ry0 - 1f;
i = p[bx0];
j = p[bx1];
b00 = p[i + by0];
b10 = p[j + by0];
b01 = p[i + by1];
b11 = p[j + by1];
sx = s_curve(rx0);
sy = s_curve(ry0);
u = rx0 * g2[b00, 0] + ry0 * g2[b00, 1];
v = rx1 * g2[b10, 0] + ry0 * g2[b10, 1];
a = Utils.Lerp(u, v, sx);
u = rx0 * g2[b01, 0] + ry1 * g2[b01, 1];
v = rx1 * g2[b11, 0] + ry1 * g2[b11, 1];
b = Utils.Lerp(u, v, sx);
return Utils.Lerp(a, b, sy);
}
static float turbulence2(float x, float y, float freq)
{
float t;
Vector2 vec;
for (t = 0f; freq >= 1f; freq *= 0.5f)
{
vec.X = freq * x;
vec.Y = freq * y;
t += noise2(vec.X, vec.Y) / freq;
}
return t;
}
private static float s_curve(float t)
{
return t * t * (3f - 2f * t);
}
}
}