private void PaintSubTree(VisualElement root, Matrix4x4 offset, bool shouldClip, bool shouldCache, Rect currentGlobalClip)
{
if (root == null || root.panel != panel)
{
return;
}
if (root.visible == false ||
root.style.opacity.GetSpecifiedValueOrDefault(1.0f) < Mathf.Epsilon)
{
return;
}
// update clip
if (root.ShouldClip())
{
var worldBound = VisualElement.ComputeAAAlignedBound(root.rect, offset * root.worldTransform);
// are we and our children clipped?
if (!worldBound.Overlaps(currentGlobalClip))
{
return;
}
float x1 = Mathf.Max(worldBound.x, currentGlobalClip.x);
float x2 = Mathf.Min(worldBound.xMax, currentGlobalClip.xMax);
float y1 = Mathf.Max(worldBound.y, currentGlobalClip.y);
float y2 = Mathf.Min(worldBound.yMax, currentGlobalClip.yMax);
// new global clip and hierarchical clip space option.
currentGlobalClip = new Rect(x1, y1, x2 - x1, y2 - y1);
shouldClip = true;
shouldCache = root.clippingOptions == VisualElement.ClippingOptions.ClipAndCacheContents;
}
else
{
//since our children are not clipped, there is no early out.
}
// Check for the rotated space - clipping issue.
if (!m_WhinedOnceAboutRotatedClipSpaceThisFrame && shouldClip && !shouldCache && DoesMatrixHaveUnsupportedRotation(root.worldTransform))
{
Debug.LogError("Panel.PaintSubTree - Rotated clip-spaces are only supported by the VisualElement.ClippingOptions.ClipAndCacheContents mode. First offending Panel:'" + root.name + "'.");
m_WhinedOnceAboutRotatedClipSpaceThisFrame = true;
}
var prevElement = m_StylePainter.currentElement;
m_StylePainter.currentElement = root;
var repaintData = panel.repaintData;
if (ShouldUsePixelCache(root))
{
// now actually paint the texture to previous group
// validate cache texture size first
var worldBound = root.worldBound;
Rect alignedRect;
int textureWidth, textureHeight;
repaintData.currentWorldClip = currentGlobalClip;
repaintData.currentOffset = offset;
using (new GUIClip.ParentClipScope(offset * root.worldTransform, currentGlobalClip))
{
alignedRect = GUIUtility.AlignRectToDevice(root.rect, out textureWidth, out textureHeight);
}
// Prevent the texture size from going empty, which may occur if the element has a sub-pixel size
textureWidth = Math.Max(textureWidth, 1);
textureHeight = Math.Max(textureHeight, 1);
var cache = root.renderData.pixelCache;
if (cache != null &&
(cache.width != textureWidth || cache.height != textureHeight) &&
(!panel.keepPixelCacheOnWorldBoundChange || m_RepaintList.Contains(root)))
{
Object.DestroyImmediate(cache);
cache = root.renderData.pixelCache = null;
}
// if the child node world transforms are not up to date due to changes below the pixel cache this is fine.
if (m_RepaintList.Contains(root) ||
root.renderData.pixelCache == null ||
!root.renderData.pixelCache.IsCreated())
{
// Recreate as needed
if (cache == null)
{
root.renderData.pixelCache = cache = new RenderTexture(
textureWidth,
textureHeight,
32, // depth
RenderTextureFormat.ARGB32,
RenderTextureReadWrite.Linear);
}
bool hasRoundedBorderRects = (root.style.borderTopLeftRadius > 0 ||
root.style.borderTopRightRadius > 0 ||
root.style.borderBottomLeftRadius > 0 ||
root.style.borderBottomRightRadius > 0);
RenderTexture temporaryTexture = null;
var old = RenderTexture.active;
try
{
// We first render to a temp texture, then blit the result into the result pixelCache again to mask the rounder corners
if (hasRoundedBorderRects)
{
// This should be an sRGB texture to conform with editor texture guidelines, however
// converting the cache to sRGB requires a shader to do it, and this whole pixel cache
// thing is slated to go away, so we take a short-cut here and use a linear texture
// along with the use of manualTex2SRGBEnabled to get the correct results.
temporaryTexture = cache = RenderTexture.GetTemporary(textureWidth, textureHeight, 32,
RenderTextureFormat.ARGB32, RenderTextureReadWrite.Linear);
}
// render the texture again to clip the round rect borders
RenderTexture.active = cache;
GL.Clear(true, true, new Color(0, 0, 0, 0));
// Calculate the offset required to translate the origin of the rect to the upper left corner
// of the pixel cache. We need to round because the rect will be rounded when rendered.
Rect worldAlignedRect = root.LocalToWorld(alignedRect);
var childrenOffset = Matrix4x4.Translate(new Vector3(-worldAlignedRect.x, -worldAlignedRect.y, 0));
Matrix4x4 offsetWorldTransform = childrenOffset * root.worldTransform;
// reset clipping
var textureClip = new Rect(0, 0, worldAlignedRect.width, worldAlignedRect.height);
repaintData.currentOffset = childrenOffset;
using (new GUIClip.ParentClipScope(offsetWorldTransform, textureClip))
{
// Paint self
repaintData.currentWorldClip = textureClip;
m_StylePainter.opacity = root.style.opacity.GetSpecifiedValueOrDefault(1.0f);
root.Repaint(m_StylePainter);
m_StylePainter.opacity = 1.0f;
PaintSubTreeChildren(root, childrenOffset, shouldClip, shouldCache, textureClip);
}
if (hasRoundedBorderRects)
{
RenderTexture.active = root.renderData.pixelCache;
bool oldManualTex2SRGBEnabled = GUIUtility.manualTex2SRGBEnabled;
GUIUtility.manualTex2SRGBEnabled = false;
using (new GUIClip.ParentClipScope(Matrix4x4.identity, textureClip))
{
GL.Clear(true, true, new Color(0, 0, 0, 0));
var textureParams = TextureStylePainterParameters.GetDefault(root);
textureParams.color = Color.white;
textureParams.texture = cache;
textureParams.scaleMode = ScaleMode.StretchToFill;
textureParams.rect = textureClip;
textureParams.border.SetWidth(0.0f);
// The rect of the temporary texture implicitly carries the scale factor of the
// transform. Since we are blitting with an identity matrix, we need to scale the
// radius manually.
// We assume uniform positive scaling without rotations.
Vector4 toScale = new Vector4(1, 0, 0, 0);
Vector4 scaled = offsetWorldTransform * toScale;
float radiusScale = scaled.x;
textureParams.border.SetRadius(
textureParams.border.topLeftRadius * radiusScale,
textureParams.border.topRightRadius * radiusScale,
textureParams.border.bottomRightRadius * radiusScale,
textureParams.border.bottomLeftRadius * radiusScale);
// No border is drawn but the rounded corners are clipped properly.
// Use premultiply alpha to avoid blending again.
textureParams.usePremultiplyAlpha = true;
m_StylePainter.DrawTexture(textureParams);
}
// Redraw the border (border was already drawn in first root.DoRepaint call).
using (new GUIClip.ParentClipScope(offsetWorldTransform, textureClip))
{
m_StylePainter.DrawBorder();
}
GUIUtility.manualTex2SRGBEnabled = oldManualTex2SRGBEnabled;
}
}
finally
{
cache = null;
if (temporaryTexture != null)
{
RenderTexture.ReleaseTemporary(temporaryTexture);
}
RenderTexture.active = old;
}
}
// now actually paint the texture to previous group
repaintData.currentWorldClip = currentGlobalClip;
repaintData.currentOffset = offset;
bool oldManualTex2SRGBEnabled2 = GUIUtility.manualTex2SRGBEnabled;
GUIUtility.manualTex2SRGBEnabled = false;
using (new GUIClip.ParentClipScope(offset * root.worldTransform, currentGlobalClip))
{
var painterParams = new TextureStylePainterParameters
{
rect = GUIUtility.AlignRectToDevice(root.rect),
uv = new Rect(0, 0, 1, 1),
texture = root.renderData.pixelCache,
color = Color.white,
scaleMode = ScaleMode.StretchToFill,
usePremultiplyAlpha = true
};
// We must not reapply the editor Play Mode Tint if it was already applied !
var playModeTint = UIElementsUtility.editorPlayModeTintColor;
UIElementsUtility.editorPlayModeTintColor = Color.white;
m_StylePainter.DrawTexture(painterParams);
UIElementsUtility.editorPlayModeTintColor = playModeTint;
}
GUIUtility.manualTex2SRGBEnabled = oldManualTex2SRGBEnabled2;
}
else
{
repaintData.currentOffset = offset;
using (new GUIClip.ParentClipScope(offset * root.worldTransform, currentGlobalClip))
{
repaintData.currentWorldClip = currentGlobalClip;
repaintData.mousePosition = root.worldTransform.inverse.MultiplyPoint3x4(repaintData.repaintEvent.mousePosition);
m_StylePainter.opacity = root.style.opacity.GetSpecifiedValueOrDefault(1.0f);
root.Repaint(m_StylePainter);
m_StylePainter.opacity = 1.0f;
PaintSubTreeChildren(root, offset, shouldClip, shouldCache, currentGlobalClip);
}
}
m_StylePainter.currentElement = prevElement;
}
