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feat(A.5 T19): mipmaps + 16x anisotropic on TerrainAtlas

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Per Phase A.5 spec §4.9.1: at N₂=12 distant terrain LBs occupy a few
pixels on screen and shimmer (texel-swap aliasing) without mipmaps.
Generate mips after atlas upload; sampler trilinear + 16x anisotropic.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-05-10 08:24:44 +02:00
parent 0afd741ea7
commit 4b84e5650b
1 changed files with 6 additions and 2 deletions
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8
src/AcDream.App/Rendering/TerrainAtlas.cs
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@ -183,13 +183,17 @@ public sealed unsafe class TerrainAtlas : IDisposable
layerIdx++;
}
gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
// A.5 T19: generate mipmaps + trilinear + 16x anisotropic for distant-LB quality.
gl.GenerateMipmap(TextureTarget.Texture2DArray);
gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.LinearMipmapLinear);
gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
gl.TexParameter(TextureTarget.Texture2DArray, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
// GL_TEXTURE_MAX_ANISOTROPY = 0x84FE (GL_EXT_texture_filter_anisotropic / ARB_texture_filter_anisotropic).
gl.TexParameter(TextureTarget.Texture2DArray, (TextureParameterName)0x84FE, 16.0f);
gl.BindTexture(TextureTarget.Texture2DArray, 0);
Console.WriteLine($"TerrainAtlas: {layerCount} terrain layers at {maxW}x{maxH}");
Console.WriteLine($"TerrainAtlas: {layerCount} terrain layers at {maxW}x{maxH} (mipmaps+aniso16x)");
// ---- Alpha atlas (new in Phase 3c.2) ----
// texMerge is guaranteed non-null here: the early return above exited