conco/OpenMaidEngine
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 3 Wiki Activity

fix: color-op alpha (0x202/0x203/0x232) is TINT STRENGTH, not object opacity

Browse Source 
Root cause (evidence: gfx-log) of the opening-CG grey background: a CG drawn with
(alpha=0, color=white) means 'no tint' = fully opaque, but slice-A conflated the
color alpha with object opacity -> the CG rendered transparent. RenderObject now
carries TintStrength separately from Alpha (opacity); resolution keeps textured
objects opaque. Tests updated to the evidence-based semantics.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
gamer147
2026-07-08 23:41:03 -04:00
parent d8bdcfed2d
commit 1a502d5adc
3 changed files with 36 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
engine/Age.Engine.Tests/AnimInterpolatorTests.cs
View File

@@ -43,15 +43,17 @@ public class AnimInterpolatorTests
}
[Fact]
public void ColorAnim_PingPongsAlphaTowardTarget()
public void ColorAnim_PingPongsTintStrength_ObjectStaysOpaque()
{
var g = VisibleObj(0x100);
// base = opaque white (no static color); target = alpha 0 (fade out) => pulses opaque<->transparent
g.SetColorAnim(0x100, period: 1000, target: GfxState.PackColor(0x00, 0x000000));
// base = no tint (strength 0); target = full-strength (alpha 0xff) red glow => strength pulses 0<->255
g.SetColorAnim(0x100, period: 1000, target: GfxState.PackColor(0xFF, 0xFF0000));
g.SnapshotVisibleObjects(0); // seeds start=0
var opaque = g.SnapshotVisibleObjects(0).Single();
Assert.Equal(255, opaque.Alpha); // t=0 -> base opaque
var baseFrame = g.SnapshotVisibleObjects(0).Single();
Assert.Equal(255, baseFrame.Alpha); // object opacity ALWAYS opaque (never the color alpha)
Assert.Equal(0, baseFrame.TintStrength); // t=0 -> no tint
var peak = g.SnapshotVisibleObjects(500).Single();
Assert.Equal(0, peak.Alpha); // t=1 -> target alpha 0
Assert.Equal(255, peak.Alpha); // still opaque
Assert.Equal(255, peak.TintStrength); // t=1 -> full tint strength (the glow peak)
}
}