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PaintDetailsTool.cs
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PaintDetailsTool.cs
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// Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License
using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using UnityEngine.Experimental.TerrainAPI;
namespace UnityEditor.Experimental.TerrainAPI
{
internal class BrushRep
{
private const int kMinBrushSize = 3;
private int m_Size;
private float[] m_Strength;
private Texture2D m_OldBrushTex;
public float GetStrengthInt(int ix, int iy)
{
ix = Mathf.Clamp(ix, 0, m_Size - 1);
iy = Mathf.Clamp(iy, 0, m_Size - 1);
float s = m_Strength[iy * m_Size + ix];
return s;
}
public void CreateFromBrush(Texture2D brushTex, int size)
{
if (size == m_Size && m_OldBrushTex == brushTex && m_Strength != null)
return;
Texture2D mask = brushTex;
if (mask != null)
{
Texture2D readableTexture = null;
if (!mask.isReadable)
{
readableTexture = new Texture2D(mask.width, mask.height, mask.format, mask.mipmapCount > 1);
Graphics.CopyTexture(mask, readableTexture);
readableTexture.Apply();
}
else
{
readableTexture = mask;
}
float fSize = size;
m_Size = size;
m_Strength = new float[m_Size * m_Size];
if (m_Size > kMinBrushSize)
{
for (int y = 0; y < m_Size; y++)
{
float v = y / fSize;
for (int x = 0; x < m_Size; x++)
{
float u = x / fSize;
m_Strength[y * m_Size + x] = readableTexture.GetPixelBilinear(u, v).r;
}
}
}
else
{
for (int i = 0; i < m_Strength.Length; i++)
m_Strength[i] = 1.0F;
}
if (readableTexture != mask)
Object.DestroyImmediate(readableTexture);
}
else
{
m_Strength = new float[1];
m_Strength[0] = 1.0F;
m_Size = 1;
}
m_OldBrushTex = brushTex;
}
}
internal class PaintDetailsUtils
{
public static int FindDetailPrototype(Terrain terrain, Terrain sourceTerrain, int sourceDetail)
{
if (sourceDetail == PaintDetailsTool.kInvalidDetail ||
sourceDetail >= sourceTerrain.terrainData.detailPrototypes.Length)
{
return PaintDetailsTool.kInvalidDetail;
}
if (terrain == sourceTerrain)
{
return sourceDetail;
}
DetailPrototype sourceDetailPrototype = sourceTerrain.terrainData.detailPrototypes[sourceDetail];
for (int i = 0; i < terrain.terrainData.detailPrototypes.Length; ++i)
{
if (sourceDetailPrototype.Equals(terrain.terrainData.detailPrototypes[i]))
return i;
}
return PaintDetailsTool.kInvalidDetail;
}
public static int CopyDetailPrototype(Terrain terrain, Terrain sourceTerrain, int sourceDetail)
{
DetailPrototype sourceDetailPrototype = sourceTerrain.terrainData.detailPrototypes[sourceDetail];
DetailPrototype[] newDetailPrototypesArray = new DetailPrototype[terrain.terrainData.detailPrototypes.Length + 1];
System.Array.Copy(terrain.terrainData.detailPrototypes, newDetailPrototypesArray, terrain.terrainData.detailPrototypes.Length);
newDetailPrototypesArray[newDetailPrototypesArray.Length - 1] = new DetailPrototype(sourceDetailPrototype);
terrain.terrainData.detailPrototypes = newDetailPrototypesArray;
terrain.terrainData.RefreshPrototypes();
return newDetailPrototypesArray.Length - 1;
}
}
internal class PaintDetailsTool : TerrainPaintTool<PaintDetailsTool>
{
public const int kInvalidDetail = -1;
private DetailPrototype m_LastSelectedDetailPrototype;
private Terrain m_TargetTerrain;
private BrushRep m_BrushRep;
public float detailOpacity { get; set; }
public float detailStrength { get; set; }
public int selectedDetail { get; set; }
public override bool OnPaint(Terrain terrain, IOnPaint editContext)
{
if (m_TargetTerrain == null ||
selectedDetail == kInvalidDetail ||
selectedDetail >= m_TargetTerrain.terrainData.detailPrototypes.Length)
{
return false;
}
Texture2D brush = editContext.brushTexture as Texture2D;
if (brush == null)
{
Debug.LogError("Brush texture is not a Texture2D.");
return false;
}
if (m_BrushRep == null)
{
m_BrushRep = new BrushRep();
}
PaintTreesDetailsContext ctx = PaintTreesDetailsContext.Create(terrain, editContext.uv);
for (int t = 0; t < ctx.terrains.Length; ++t)
{
Terrain ctxTerrain = ctx.terrains[t];
if (ctxTerrain != null)
{
int detailPrototype = PaintDetailsUtils.FindDetailPrototype(ctxTerrain, m_TargetTerrain, selectedDetail);
if (detailPrototype == kInvalidDetail)
{
detailPrototype = PaintDetailsUtils.CopyDetailPrototype(ctxTerrain, m_TargetTerrain, selectedDetail);
}
TerrainData terrainData = ctxTerrain.terrainData;
TerrainPaintUtilityEditor.UpdateTerrainDataUndo(terrainData, "Terrain - Detail Edit");
int size = (int)Mathf.Max(1.0f, editContext.brushSize * ((float)terrainData.detailResolution / terrainData.size.x));
m_BrushRep.CreateFromBrush(brush, size);
Vector2 ctxUV = ctx.uvs[t];
int xCenter = Mathf.FloorToInt(ctxUV.x * terrainData.detailWidth);
int yCenter = Mathf.FloorToInt(ctxUV.y * terrainData.detailHeight);
int intRadius = Mathf.RoundToInt(size) / 2;
int intFraction = Mathf.RoundToInt(size) % 2;
int xmin = xCenter - intRadius;
int ymin = yCenter - intRadius;
int xmax = xCenter + intRadius + intFraction;
int ymax = yCenter + intRadius + intFraction;
if (xmin >= terrainData.detailWidth || ymin >= terrainData.detailHeight || xmax <= 0 || ymax <= 0)
{
continue;
}
xmin = Mathf.Clamp(xmin, 0, terrainData.detailWidth - 1);
ymin = Mathf.Clamp(ymin, 0, terrainData.detailHeight - 1);
xmax = Mathf.Clamp(xmax, 0, terrainData.detailWidth);
ymax = Mathf.Clamp(ymax, 0, terrainData.detailHeight);
int width = xmax - xmin;
int height = ymax - ymin;
float targetStrength = detailStrength;
if (Event.current.shift || Event.current.control)
targetStrength = -targetStrength;
int[] layers = { detailPrototype };
if (targetStrength < 0.0F && !Event.current.control)
layers = terrainData.GetSupportedLayers(xmin, ymin, width, height);
for (int i = 0; i < layers.Length; i++)
{
int[,] alphamap = terrainData.GetDetailLayer(xmin, ymin, width, height, layers[i]);
for (int y = 0; y < height; y++)
{
for (int x = 0; x < width; x++)
{
int xBrushOffset = (xmin + x) - (xCenter - intRadius + intFraction);
int yBrushOffset = (ymin + y) - (yCenter - intRadius + intFraction);
float opa = detailOpacity * m_BrushRep.GetStrengthInt(xBrushOffset, yBrushOffset);
float targetValue = Mathf.Lerp(alphamap[y, x], targetStrength, opa);
alphamap[y, x] = Mathf.RoundToInt(targetValue - .5f + Random.value);
}
}
terrainData.SetDetailLayer(xmin, ymin, layers[i], alphamap);
}
}
}
return false;
}
public override void OnEnterToolMode()
{
Terrain terrain = null;
if (Selection.activeGameObject != null)
{
terrain = Selection.activeGameObject.GetComponent<Terrain>();
}
if (terrain != null &&
terrain.terrainData != null &&
m_LastSelectedDetailPrototype != null)
{
for (int i = 0; i < terrain.terrainData.detailPrototypes.Length; ++i)
{
if (m_LastSelectedDetailPrototype.Equals(terrain.terrainData.detailPrototypes[i]))
{
selectedDetail = i;
break;
}
}
}
m_TargetTerrain = terrain;
m_LastSelectedDetailPrototype = null;
}
public override void OnExitToolMode()
{
if (m_TargetTerrain != null &&
m_TargetTerrain.terrainData != null &&
selectedDetail != kInvalidDetail &&
selectedDetail < m_TargetTerrain.terrainData.detailPrototypes.Length)
{
m_LastSelectedDetailPrototype = new DetailPrototype(m_TargetTerrain.terrainData.detailPrototypes[selectedDetail]);
}
selectedDetail = kInvalidDetail;
}
public override string GetName()
{
return "Paint Details";
}
public override string GetDesc()
{
return "Paints the selected detail prototype onto the terrain";
}
public override void OnSceneGUI(Terrain terrain, IOnSceneGUI editContext)
{
// We're only doing painting operations, early out if it's not a repaint
if (Event.current.type != EventType.Repaint)
return;
if (editContext.hitValidTerrain)
{
BrushTransform brushXform = TerrainPaintUtility.CalculateBrushTransform(terrain, editContext.raycastHit.textureCoord, editContext.brushSize, 0.0f);
PaintContext ctx = TerrainPaintUtility.BeginPaintHeightmap(terrain, brushXform.GetBrushXYBounds(), 1);
TerrainPaintUtilityEditor.DrawBrushPreview(ctx, TerrainPaintUtilityEditor.BrushPreview.SourceRenderTexture, editContext.brushTexture, brushXform, TerrainPaintUtilityEditor.GetDefaultBrushPreviewMaterial(), 0);
TerrainPaintUtility.ReleaseContextResources(ctx);
}
}
}
}