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Fix soft mask parameter synchronization for stencil materials #540

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Fix soft mask parameter synchronization for stencil materials #540

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44 changes: 33 additions & 11 deletions Runtime/Scripts/Effects/SoftMaskScript.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ namespace UnityEngine.UI.Extensions
public class SoftMaskScript : MonoBehaviour
{
Material mat;
Graphic cachedGraphic;

Canvas cachedCanvas = null;
Transform cachedCanvasTransform = null;
Expand Down Expand Up @@ -63,13 +64,14 @@ void Start()
return;
}

var graphic = GetComponent<Graphic>();
if (graphic != null)
cachedGraphic = GetComponent<Graphic>();
if (cachedGraphic != null)
{
mat = new Material(ShaderLibrary.GetShaderInstance("UI Extensions/SoftMaskShader"));
graphic.material = mat;
cachedCanvas = graphic.canvas;
cachedCanvas = cachedGraphic.canvas;
cachedCanvasTransform = cachedCanvas.transform;
SetMask();
cachedGraphic.material = mat;
}
}

Expand All @@ -85,18 +87,38 @@ void SetMask()
{
var worldRect = GetCanvasRect();
var size = worldRect.size;
if (size.x == 0f || size.y == 0f)
return;

maskScale.Set(1.0f / size.x, 1.0f / size.y);
maskOffset = -worldRect.min;
maskOffset.Scale(maskScale);

mat.SetTextureOffset("_AlphaMask", maskOffset);
mat.SetTextureScale("_AlphaMask", maskScale);
mat.SetTexture("_AlphaMask", AlphaMask);
ApplyMask(mat);

if (cachedGraphic == null || !cachedGraphic.isActiveAndEnabled || cachedGraphic.material != mat)
return;

// A parent Mask can give the renderer a cached stencil copy of our material.
var renderer = cachedGraphic.canvasRenderer;
if (renderer.materialCount == 0)
return;

mat.SetFloat("_HardBlend", HardBlend ? 1 : 0);
mat.SetInt("_FlipAlphaMask", FlipAlphaMask ? 1 : 0);
mat.SetInt("_NoOuterClip", DontClipMaskScalingRect ? 1 : 0);
mat.SetFloat("_CutOff", CutOff);
var renderingMaterial = renderer.GetMaterial(0);
if (renderingMaterial != null && renderingMaterial != mat && renderingMaterial.shader == mat.shader)
ApplyMask(renderingMaterial);
}

void ApplyMask(Material material)
{
material.SetTextureOffset("_AlphaMask", maskOffset);
material.SetTextureScale("_AlphaMask", maskScale);
material.SetTexture("_AlphaMask", AlphaMask);

material.SetFloat("_HardBlend", HardBlend ? 1 : 0);
material.SetInt("_FlipAlphaMask", FlipAlphaMask ? 1 : 0);
material.SetInt("_NoOuterClip", DontClipMaskScalingRect ? 1 : 0);
material.SetFloat("_CutOff", CutOff);
}

public Rect GetCanvasRect()
Expand Down