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fix(gfx): restore third CG glow

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gamer147
2026-07-11 20:05:51 -04:00
parent 7c0495c88d
commit 2a49a0697c
9 changed files with 154 additions and 27 deletions
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43
engine/Age.Engine.Tests/RenderObjectBlendTests.cs
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@@ -46,24 +46,53 @@ public class RenderObjectBlendTests
}
[Fact]
public void DrawColor_0x203_IsTintStrength_ObjectStaysOpaque()
public void TexturedMode0_UsesOpaqueMultiplicativeRgbAndIgnoresPackedAlpha()
{
// Op 0x203/0x202 alpha is TINT-BLEND STRENGTH, not object opacity (evidence: a CG drawn with
// (alpha=0, color=white) must stay fully OPAQUE + untinted, not vanish). Root cause of the grey-BG.
// Mode 0 is the native opaque textured path. Its packed alpha byte is neither object opacity nor
// tint strength; RGB multiplicatively modulates the source, so white is identity.
var g = WithVisibleObject(0x100, resId: 5, colorKey: -1);
g.SetObjectColor(0x100, GfxState.PackColor(0x00, 0xFFFFFF)); // "no tint" — the grey-BG case
var ro = g.SnapshotVisibleObjects().Single();
Assert.Equal(255, ro.Alpha); // OBJECT STAYS OPAQUE (was wrongly 0 -> invisible)
Assert.Equal(255, ro.Alpha); // opaque
Assert.Equal(0, ro.TintStrength); // zero tint strength
Assert.True(ro.MultiplyTint);
g.SetObjectColor(0x100, GfxState.PackColor(0x80, 0x102030)); // half-strength tint toward 0x102030
g.SetObjectColor(0x100, GfxState.PackColor(0x80, 0x102030));
var ro2 = g.SnapshotVisibleObjects().Single();
Assert.Equal(255, ro2.Alpha); // still opaque
Assert.Equal(0x80, ro2.TintStrength); // strength from the alpha byte
Assert.Equal(255, ro2.Alpha); // packed alpha remains ignored
Assert.Equal(0, ro2.TintStrength);
Assert.Equal(0x102030, ro2.Tint);
Assert.True(ro2.MultiplyTint);
Assert.Equal(BlendKind.Alpha, ro2.Blend);
}
[Fact]
public void TransitionCleanup_Mode2ToMode0PreservedWhite_RemainsIdentity()
{
var g = WithVisibleObject(0x100, resId: 5, colorKey: -1);
g.SetStaticObjectColorResolved(0x100, 2, -1, -1); // 0x128de: transition source
Assert.Equal(0, g.SnapshotVisibleObjects().Single().TintStrength);
g.SetStaticObjectColorResolved(0x100, 0, -1, -1); // 0x12478: transition cleanup
var rendered = g.SnapshotVisibleObjects().Single();
Assert.Equal(255, rendered.Alpha);
Assert.Equal(0xffffff, rendered.Tint);
Assert.Equal(0, rendered.TintStrength);
Assert.True(rendered.MultiplyTint);
}
[Fact]
public void SurfacelessMode0_RetainsFillStrength()
{
var g = new GfxState();
g.BindDraw(0x100, 1, 0, 0, 10, 10, 0, 0);
g.SetObjectColor(0x100, GfxState.PackColor(0x80, 0x102030));
var rendered = g.SnapshotVisibleObjects().Single();
Assert.Equal(255, rendered.Alpha);
Assert.Equal(0x80, rendered.TintStrength);
Assert.False(rendered.MultiplyTint);
}
[Fact]
public void Mode1_UsesArgbAlphaAsOpacityAndRgbAsMultiplicativeModulation()
{