c0b6199dbc
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>
60 lines
2.5 KiB
C#
60 lines
2.5 KiB
C#
using System.Linq;
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using Age.Engine.Model;
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using Xunit;
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public class AnimInterpolatorTests
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{
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private static GfxState VisibleObj(long handle)
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{
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var g = new GfxState();
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g.SetSurface(1, resId: 5, colorKey: -1);
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g.BindDraw(handle, 1, 0, 0, 256, 64, 100, 100); // 256x64 sheet, base pos (100,100)
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return g;
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}
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[Fact]
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public void PingPong_FoldsAtHalfPeriod()
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{
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Assert.Equal(0, BlendMath.PingPong(now: 0, start: 0, period: 1000));
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Assert.Equal(500, BlendMath.PingPong(now: 500, start: 0, period: 1000)); // peak at half
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Assert.Equal(0, BlendMath.PingPong(now: 1000, start: 0, period: 1000)); // back to base
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}
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[Fact]
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public void SrcRect_StaticCell_SelectsSubRect()
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{
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var g = VisibleObj(0x100);
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g.SetSrcRect(0x100, gridW: 4, gridH: 1, cell: 2, period: 0); // static cell 2 of 4 across 256px
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var ro = g.SnapshotVisibleObjects(0).Single();
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Assert.Equal(128, ro.SrcX); // cell 2 * 64
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Assert.Equal(64, ro.W);
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}
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[Fact]
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public void SrcRect_Animated_PingPongsCellAcrossGrid()
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{
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var g = VisibleObj(0x100);
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g.SetSrcRect(0x100, gridW: 4, gridH: 1, cell: 0, period: 1000);
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g.SnapshotVisibleObjects(0); // seeds start=0
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var half = g.SnapshotVisibleObjects(500).Single();
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Assert.Equal(192, half.SrcX); // t=1 -> last cell (3) * 64
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var back = g.SnapshotVisibleObjects(1000).Single();
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Assert.Equal(0, back.SrcX); // ping-ponged back to cell 0
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}
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[Fact]
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public void ColorAnim_PingPongsTintStrength_ObjectStaysOpaque()
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{
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var g = VisibleObj(0x100);
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// base = no tint (strength 0); target = full-strength (alpha 0xff) red glow => strength pulses 0<->255
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g.SetColorAnim(0x100, period: 1000, target: GfxState.PackColor(0xFF, 0xFF0000));
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g.SnapshotVisibleObjects(0); // seeds start=0
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var baseFrame = g.SnapshotVisibleObjects(0).Single();
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Assert.Equal(255, baseFrame.Alpha); // object opacity ALWAYS opaque (never the color alpha)
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Assert.Equal(0, baseFrame.TintStrength); // t=0 -> no tint
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var peak = g.SnapshotVisibleObjects(500).Single();
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Assert.Equal(255, peak.Alpha); // still opaque
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Assert.Equal(255, peak.TintStrength); // t=1 -> full tint strength (the glow peak)
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}
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}
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