GoaLitiuM/FlaxEngine
1
0
Fork 0
Code Issues Pull Requests Actions 7 Packages Projects Releases Wiki Activity

Fix Render2D.DrawRectangle to avoid alpha overdraw on the corners when thickness is large

Browse Source
This commit is contained in:
Wojtek Figat
2026-03-12 10:10:47 +01:00
parent 62e492452d
commit 7fa40eba83
1 changed files with 20 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
Source/Engine/Render2D/Render2D.cpp
View File

@@ -1440,8 +1440,28 @@ void Render2D::DrawRectangle(const Rectangle& rect, const Color& color1, const C
RENDER2D_CHECK_RENDERING_STATE;
const auto& mask = ClipLayersStack.Peek().Mask;
float thick = thickness;
thickness *= (TransformCached.M11 + TransformCached.M22 + TransformCached.M33) * 0.3333333f;
// When lines thickness is very large, don't use corner caps and place line ends to not overlap
if (thickness > 4.0f)
{
thick *= Math::Lerp(0.6f, 1.0f, Math::Saturate(thick - 4.0f)); // Smooth transition between soft LineAA and harsh FillRect
Float2 totalMin = rect.GetUpperLeft() - Float2(thick * 0.5f);
Float2 totalMax = rect.GetBottomRight() + Float2(thick * 0.5f);
Float2 size = totalMax - totalMin;
Render2DDrawCall& drawCall = DrawCalls.AddOne();
drawCall.Type = NeedAlphaWithTint(color1, color2, color3, color4) ? DrawCallType::FillRect : DrawCallType::FillRectNoAlpha;
drawCall.StartIB = IBIndex;
drawCall.CountIB = 6 * 4;
// TODO: interpolate colors from corners to extended rectangle edges properly
WriteRect(Rectangle(totalMin.X, totalMin.Y, size.X, thick), color1, color2, color2, color1);
WriteRect(Rectangle(totalMin.X, totalMin.Y + rect.Size.Y, size.X, thick), color4, color3, color3, color4);
WriteRect(Rectangle(totalMin.X, totalMin.Y + thick, thick, rect.Size.Y - thick), color1, color1, color4, color4);
WriteRect(Rectangle(totalMax.X - thick, totalMin.Y + thick, thick, rect.Size.Y - thick), color2, color2, color3, color3);
return;
}
Float2 points[5];
ApplyTransform(rect.GetUpperLeft(), points[0]);
ApplyTransform(rect.GetUpperRight(), points[1]);