DuckStation: Best settings.ini for PS1 Texture Filtering Fixes

The objective is to enable Geometry Correction and Perspective Correction while using JINC2 or Bilinear filtering to smooth out pixelated textures at 4K.

1. The PGXP “Texture Straightening” Setup

Without PGXP, textures will “wobble” as you move. This is known as the affine mapping error ($E_{affine}$).

Setting	Recommended Value	Technical Purpose
PGXP Geometry Correction	Enabled	Stops polygon jitter/snapping by using floating-point math.
PGXP Perspective Correct Textures	Enabled	Critical: Fixes texture warping on large surfaces like floors.
PGXP Culling Correction	Enabled	Prevents textures from disappearing at the edges of the screen.
PGXP Depth Buffer	Enabled	Adds a modern Z-buffer to stop objects from clipping through each other.

2. Advanced Texture Filtering (Gfx_Vulkan / Gfx_D3D12)

Once the textures are “straight,” you need to decide how to filter the raw pixels ($P_{raw}$).

Step-by-Step Instructions:

1. Open your settings.ini (located in %AppData%\Local\DuckStation).
2. Locate the [Graphics] and [Rendering] sections.
3. Apply these 2026-standard values:
   • TextureFiltering: JINC2 (Best for 4K) or Bilinear (Most compatible).
   • SpriteTextureFiltering: Nearest (Keep 2D sprites sharp) or Bilinear (Smooths them).
   • InternalResolutionScale: 9 (for 4K) or 6 (for 1440p).
   • TrueColorRendering: true (Eliminates the “grid” pattern/dithering in 24-bit).

3. Fixing the “MGS Radar” & “Silent Hill” Glitches

High-precision PGXP can sometimes break 2D elements that rely on specific integer coordinates (like the Metal Gear Solid radar or Silent Hill map).

The GameEngineer.net Override:

• If your HUD looks “broken,” find the PGXP Tolerance setting in the GUI (or PGXPTolerance in .ini) and set it to 0.01 rather than 0.00.
• Vertex Cache: Set to true to improve performance, but disable it if you see “trailing” ghost images behind character models ($T_{ghost}$).

4. Technical Comparison: Filtering vs. Authenticity

Metric	Nearest Neighbor	Bilinear / JINC2	PGXP Enabled
Visual Style	Pixelated / Retro	Smooth / Modern	Stable / Remastered
Texture Warping	High	High	Zero
DPC Latency	Lowest	Moderate	Minimal
Recommended for	2D Platformers	3D Open World	All 3D Titles