public void GatherAlphamap(TerrainLayer inputLayer, bool addLayerIfDoesntExist = true)
{
if (inputLayer == null)
{
return;
}
Material copyTerrainLayerMaterial = TerrainPaintUtility.GetCopyTerrainLayerMaterial();
Vector4[] layerMasks = { new Vector4(1, 0, 0, 0), new Vector4(0, 1, 0, 0), new Vector4(0, 0, 1, 0), new Vector4(0, 0, 0, 1) };
GatherInternal(
t =>
{ // return the texture to be gathered from this terrain tile
SplatmapUserData userData = GetTerrainLayerUserData(t, inputLayer, addLayerIfDoesntExist);
if (userData != null)
{
return(TerrainPaintUtility.GetTerrainAlphaMapChecked(t.terrain, userData.mapIndex));
}
else
{
return(null);
}
},
new Color(0.0f, 0.0f, 0.0f, 0.0f),
"PaintContext.GatherAlphamap",
copyTerrainLayerMaterial, 0,
t =>
{ // before blit -- setup layer mask in the material
SplatmapUserData userData = GetTerrainLayerUserData(t);
if (userData == null)
{
return;
}
copyTerrainLayerMaterial.SetVector("_LayerMask", layerMasks[userData.channelIndex]);
});
}
public void ScatterAlphamap(string editorUndoName)
{
Vector4[] layerMasks = { new Vector4(1, 0, 0, 0), new Vector4(0, 1, 0, 0), new Vector4(0, 0, 1, 0), new Vector4(0, 0, 0, 1) };
Material copyTerrainLayerMaterial = TerrainPaintUtility.GetCopyTerrainLayerMaterial();
var rtdesc = new RenderTextureDescriptor(destinationRenderTexture.width, destinationRenderTexture.height, GraphicsFormat.R8G8B8A8_UNorm, GraphicsFormat.None);
rtdesc.sRGB = false;
rtdesc.useMipMap = false;
rtdesc.autoGenerateMips = false;
RenderTexture tempTarget = RenderTexture.GetTemporary(rtdesc);
ScatterInternal(
t => // We're going to do ALL of the work in this terrainToRT function, as it is very custom, and we'll just return null to skip the ScatterInternal rendering
{
SplatmapUserData userData = GetTerrainLayerUserData(t);
if (userData != null)
{
onTerrainTileBeforePaint?.Invoke(t, ToolAction.PaintTexture, editorUndoName);
int targetAlphamapIndex = userData.mapIndex;
int targetChannelIndex = userData.channelIndex;
Texture2D targetAlphamapTexture = t.terrain.terrainData.alphamapTextures[targetAlphamapIndex];
destinationRenderTexture.filterMode = FilterMode.Point;
sourceRenderTexture.filterMode = FilterMode.Point;
// iterate all alphamaps to modify them (have to modify all to renormalize)
for (int i = 0; i <= t.terrain.terrainData.alphamapTextureCount; i++) // NOTE: this is a non-standard for loop
{
// modify the target index last, (skip it the first time)
if (i == targetAlphamapIndex)
{
continue;
}
int alphamapIndex = (i == t.terrain.terrainData.alphamapTextureCount) ? targetAlphamapIndex : i;
Texture2D alphamapTexture = t.terrain.terrainData.alphamapTextures[alphamapIndex];
if ((alphamapTexture.width != targetTextureWidth) || (alphamapTexture.height != targetTextureHeight))
{
Debug.LogWarning("PaintContext alphamap operations must use the same resolution for all Terrains - mismatched Terrains are ignored.", t.terrain);
continue;
}
RenderTexture.active = tempTarget;
GL.PushMatrix();
GL.LoadPixelMatrix(0, tempTarget.width, 0, tempTarget.height);
{
copyTerrainLayerMaterial.SetTexture("_MainTex", destinationRenderTexture);
copyTerrainLayerMaterial.SetTexture("_OldAlphaMapTexture", sourceRenderTexture);
copyTerrainLayerMaterial.SetTexture("_OriginalTargetAlphaMap", targetAlphamapTexture);
copyTerrainLayerMaterial.SetTexture("_AlphaMapTexture", alphamapTexture);
copyTerrainLayerMaterial.SetVector("_LayerMask", alphamapIndex == targetAlphamapIndex ? layerMasks[targetChannelIndex] : Vector4.zero);
copyTerrainLayerMaterial.SetVector("_OriginalTargetAlphaMask", layerMasks[targetChannelIndex]);
copyTerrainLayerMaterial.SetPass(1);
TerrainPaintUtility.DrawQuad2(t.clippedPCPixels, t.clippedPCPixels, destinationRenderTexture, t.clippedTerrainPixels, alphamapTexture);
}
GL.PopMatrix();
t.terrain.terrainData.CopyActiveRenderTextureToTexture(TerrainData.AlphamapTextureName, alphamapIndex, t.clippedPCPixels, t.clippedTerrainPixels.min, true);
}
RenderTexture.active = null;
OnTerrainPainted(t, ToolAction.PaintTexture);
}
return(null);
},
"PaintContext.ScatterAlphamap",
copyTerrainLayerMaterial, 0);
RenderTexture.ReleaseTemporary(tempTarget);
}
private void ScatterInternal(
Func <ITerrainInfo, RenderTexture> terrainToRT,
string operationName,
Material blitMaterial = null,
int blitPass = 0,
Action <ITerrainInfo> beforeBlit = null,
Action <ITerrainInfo> afterBlit = null)
{
var oldRT = RenderTexture.active;
if (blitMaterial == null)
{
blitMaterial = TerrainPaintUtility.GetBlitMaterial();
}
for (int i = 0; i < m_TerrainTiles.Count; i++)
{
TerrainTile terrainTile = m_TerrainTiles[i];
if (!terrainTile.scatterEnable)
{
continue;
}
RenderTexture target = terrainToRT(terrainTile);
if ((target == null) || (!terrainTile.scatterEnable)) // double check scatterEnable in case terrainToRT modified it
{
continue;
}
if ((target.width != targetTextureWidth) || (target.height != targetTextureHeight))
{
Debug.LogWarning(operationName + " requires the same resolution for all Terrains - mismatched Terrains are ignored.", terrainTile.terrain);
continue;
}
beforeBlit?.Invoke(terrainTile);
if (!terrainTile.scatterEnable) // check again, beforeBlit may have modified it
{
continue;
}
RenderTexture.active = target;
GL.PushMatrix();
GL.LoadPixelMatrix(0, target.width, 0, target.height);
{
FilterMode oldFilterMode = destinationRenderTexture.filterMode;
destinationRenderTexture.filterMode = FilterMode.Point;
blitMaterial.SetTexture("_MainTex", destinationRenderTexture);
blitMaterial.SetPass(blitPass);
TerrainPaintUtility.DrawQuad(terrainTile.clippedTerrainPixels, terrainTile.clippedPCPixels, destinationRenderTexture);
destinationRenderTexture.filterMode = oldFilterMode;
}
GL.PopMatrix();
afterBlit?.Invoke(terrainTile);
}
RenderTexture.active = oldRT;
}
private void GatherInternal(
Func <ITerrainInfo, Texture> terrainToTexture,
Color defaultColor,
string operationName,
Material blitMaterial = null,
int blitPass = 0,
Action <ITerrainInfo> beforeBlit = null,
Action <ITerrainInfo> afterBlit = null)
{
if (blitMaterial == null)
{
blitMaterial = TerrainPaintUtility.GetBlitMaterial();
}
RenderTexture.active = sourceRenderTexture;
GL.Clear(true, true, defaultColor);
GL.PushMatrix();
GL.LoadPixelMatrix(0, pixelRect.width, 0, pixelRect.height);
for (int i = 0; i < m_TerrainTiles.Count; i++)
{
TerrainTile terrainTile = m_TerrainTiles[i];
if (!terrainTile.gatherEnable)
{
continue;
}
Texture sourceTexture = terrainToTexture(terrainTile);
if ((sourceTexture == null) || (!terrainTile.gatherEnable)) // double check gatherEnable in case terrainToTexture modified it
{
continue;
}
if ((sourceTexture.width != targetTextureWidth) || (sourceTexture.height != targetTextureHeight))
{
Debug.LogWarning(operationName + " requires the same resolution texture for all Terrains - mismatched Terrains are ignored.", terrainTile.terrain);
continue;
}
beforeBlit?.Invoke(terrainTile);
if (!terrainTile.gatherEnable) // check again, beforeBlit may have modified it
{
continue;
}
FilterMode oldFilterMode = sourceTexture.filterMode;
sourceTexture.filterMode = FilterMode.Point;
blitMaterial.SetTexture("_MainTex", sourceTexture);
blitMaterial.SetPass(blitPass);
// Draw padded quads to support extended-edge sampling of each terrain tile into empty regions.
TerrainPaintUtility.DrawQuadPadded(terrainTile.clippedPCPixels, terrainTile.paddedPCPixels,
terrainTile.clippedTerrainPixels, terrainTile.paddedTerrainPixels, sourceTexture);
sourceTexture.filterMode = oldFilterMode;
afterBlit?.Invoke(terrainTile);
}
GL.PopMatrix();
RenderTexture.active = oldRenderTexture;
}