ba852993e9
Pure-CPU slot allocator for the terrain modern dispatcher's global VBO/EBO. FIFO free-list + monotonic counter, mirroring WB's TerrainRenderManager pattern. Caller (TerrainModernRenderer) handles GPU buffer growth when Allocate sets needsGrow=true. 8 unit tests cover: fresh-allocator returns slot 0, sequential allocs, free+alloc reuse, FIFO ordering, needsGrow signaling on capacity overflow, GrowTo, LoadedCount tracking, and double-free detection. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
88 lines
2.5 KiB
C#
88 lines
2.5 KiB
C#
using AcDream.Core.Terrain;
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using Xunit;
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namespace AcDream.Core.Tests.Terrain;
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public class TerrainSlotAllocatorTests
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{
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[Fact]
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public void Allocate_FromFreshAllocator_ReturnsZero()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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Assert.Equal(0, alloc.Allocate(out _));
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}
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[Fact]
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public void Allocate_TwoTimes_ReturnsZeroThenOne()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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Assert.Equal(0, alloc.Allocate(out _));
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Assert.Equal(1, alloc.Allocate(out _));
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}
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[Fact]
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public void FreeThenAllocate_ReusesFreedSlot()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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var s0 = alloc.Allocate(out _);
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var s1 = alloc.Allocate(out _);
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alloc.Free(s0);
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Assert.Equal(s0, alloc.Allocate(out _));
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}
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[Fact]
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public void FreeOrderedFreshAllocs_ReturnsInFifoOrder()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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var s0 = alloc.Allocate(out _);
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var s1 = alloc.Allocate(out _);
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var s2 = alloc.Allocate(out _);
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alloc.Free(s0);
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alloc.Free(s2);
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Assert.Equal(s0, alloc.Allocate(out _));
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Assert.Equal(s2, alloc.Allocate(out _));
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}
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[Fact]
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public void Allocate_BeyondInitialCapacity_SignalsNeedsGrow()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 2);
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alloc.Allocate(out var grow0);
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alloc.Allocate(out var grow1);
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alloc.Allocate(out var grow2);
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Assert.False(grow0);
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Assert.False(grow1);
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Assert.True(grow2);
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}
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[Fact]
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public void GrowTo_DoublesCapacityCorrectly()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 4);
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alloc.GrowTo(8);
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Assert.Equal(8, alloc.Capacity);
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alloc.GrowTo(64);
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Assert.Equal(64, alloc.Capacity);
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}
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[Fact]
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public void LoadedCount_TracksAllocAndFree()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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Assert.Equal(0, alloc.LoadedCount);
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var s0 = alloc.Allocate(out _);
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var s1 = alloc.Allocate(out _);
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Assert.Equal(2, alloc.LoadedCount);
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alloc.Free(s0);
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Assert.Equal(1, alloc.LoadedCount);
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}
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[Fact]
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public void Free_TwiceForSameSlot_Throws()
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{
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var alloc = new TerrainSlotAllocator(initialCapacity: 8);
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var s0 = alloc.Allocate(out _);
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alloc.Free(s0);
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Assert.Throws<InvalidOperationException>(() => alloc.Free(s0));
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}
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}
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