private void PaintSubTreeChildren(Event e, VisualElement root, Matrix4x4 offset, VisualElement.ClippingOptions clippingOption, Rect textureClip)
{
int count = root.shadow.childCount;
for (int i = 0; i < count; i++)
{
VisualElement child = root.shadow[i];
PaintSubTree(e, child, offset, clippingOption, textureClip);
if (count != root.shadow.childCount)
{
throw new NotImplementedException("Visual tree is read-only during repaint");
}
}
}
private void PaintSubTree(Event e, VisualElement root, Matrix4x4 offset, VisualElement.ClippingOptions clippingOption, Rect currentGlobalClip)
{
if (root == null || root.panel != this)
{
return;
}
if (root.visible == false ||
root.style.opacity.GetSpecifiedValueOrDefault(1.0f) < Mathf.Epsilon)
{
return;
}
// update clip
if (root.clippingOptions != VisualElement.ClippingOptions.NoClipping)
{
var worldBound = 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);
clippingOption = root.clippingOptions;
}
else
{
//since our children are not clipped, there is no early out.
}
// Check for the rotated space - clipping issue.
if (!whinedOnceAboutRotatedClipSpaceThisFrame && clippingOption == VisualElement.ClippingOptions.ClipContents && DoesMatrixHaveUnsupportedRotation(root.worldTransform))
{
Debug.LogError("Panel.PaintSubTree - Rotated clip-spaces are only supported by the VisualElement.ClippingOptions.ClipAndCacheContents mode. First offending Panel:'" + root.name + "'.");
whinedOnceAboutRotatedClipSpaceThisFrame = true;
}
if (ShouldUsePixelCache(root))
{
// now actually paint the texture to previous group
IStylePainter painter = stylePainter;
// validate cache texture size first
var worldBound = root.worldBound;
Rect alignedRect;
int textureWidth, textureHeight;
painter.currentWorldClip = currentGlobalClip;
painter.currentTransform = offset * root.worldTransform;
using (new GUIClip.ParentClipScope(painter.currentTransform, 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) &&
(!keepPixelCacheOnWorldBoundChange || root.IsDirty(ChangeType.Repaint)))
{
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 (root.IsDirty(ChangeType.Repaint) ||
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.sRGB);
}
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)
{
temporaryTexture = cache = RenderTexture.GetTemporary(textureWidth, textureHeight, 32,
RenderTextureFormat.ARGB32, RenderTextureReadWrite.sRGB);
}
// 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);
painter.currentTransform = offsetWorldTransform;
// Metal ignores the sRGBWrite flag and will always do linear to gamma conversions
// when writing to an sRGB buffer. In this situation, we disable the manual sRGB
// conversion since it will be done automatically when writing to the framebuffer.
bool manualTex2SRGBEnabled = (SystemInfo.graphicsDeviceType != GraphicsDeviceType.Metal);
using (new GUIUtility.ManualTex2SRGBScope(manualTex2SRGBEnabled))
using (new GUIClip.ParentClipScope(painter.currentTransform, textureClip))
{
// Paint self
painter.currentWorldClip = textureClip;
stylePainter.opacity = root.style.opacity.GetSpecifiedValueOrDefault(1.0f);
root.DoRepaint(painter);
stylePainter.opacity = 1.0f;
root.ClearDirty(ChangeType.Repaint);
PaintSubTreeChildren(e, root, childrenOffset, clippingOption, textureClip);
}
if (hasRoundedBorderRects)
{
RenderTexture.active = root.renderData.pixelCache;
// Fix up transform for subtree to match texture upper left.
painter.currentTransform = Matrix4x4.identity;
using (new GUIUtility.ManualTex2SRGBScope(manualTex2SRGBEnabled))
using (new GUIClip.ParentClipScope(painter.currentTransform, textureClip))
{
GL.Clear(true, true, new Color(0, 0, 0, 0));
var textureParams = painter.GetDefaultTextureParameters(root);
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;
painter.DrawTexture(textureParams);
}
// Redraw the border (border was already drawn in first root.DoRepaint call).
painter.currentTransform = offsetWorldTransform;
using (new GUIUtility.ManualTex2SRGBScope(manualTex2SRGBEnabled))
using (new GUIClip.ParentClipScope(painter.currentTransform, textureClip))
{
painter.DrawBorder(root);
}
}
}
finally
{
cache = null;
if (temporaryTexture != null)
{
RenderTexture.ReleaseTemporary(temporaryTexture);
}
RenderTexture.active = old;
}
}
// now actually paint the texture to previous group
painter.currentWorldClip = currentGlobalClip;
painter.currentTransform = offset * root.worldTransform;
using (new GUIClip.ParentClipScope(painter.currentTransform, 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
};
painter.DrawTexture(painterParams);
}
}
else
{
stylePainter.currentTransform = offset * root.worldTransform;
using (new GUIClip.ParentClipScope(stylePainter.currentTransform, currentGlobalClip))
{
stylePainter.currentWorldClip = currentGlobalClip;
stylePainter.mousePosition = root.worldTransform.inverse.MultiplyPoint3x4(e.mousePosition);
stylePainter.opacity = root.style.opacity.GetSpecifiedValueOrDefault(1.0f);
root.DoRepaint(stylePainter);
stylePainter.opacity = 1.0f;
root.ClearDirty(ChangeType.Repaint);
PaintSubTreeChildren(e, root, offset, clippingOption, currentGlobalClip);
}
}
}
