postfx: eliminat l'uniform oversample i vestigis de supersampling/Lanczos mai implementats

source/core/rendering/sdl3gpu/msl/postfx_frag.msl.h

@@ -31,8 +31,8 @@ struct PostFXUniforms {
     float bleeding;
     float pixel_scale;
     float time;
-    float oversample;
     float flicker;
+    float pad2;
     // vec4 #3 — paràmetres de scanlines (exposats per preset YAML)
     float scan_dark_ratio;
     float scan_dark_floor;
@@ -82,7 +82,7 @@ fragment float4 postfx_fs(PostVOut                 in    [[stage_in]],
     float3 colour;
     if (u.bleeding > 0.0f) {
         float tw    = float(scene.get_width());
-        float step  = u.oversample / tw;
+        float step  = 1.0f / tw;
         float3 ycc    = rgb_to_ycc(base);
         float3 ycc_l2 = rgb_to_ycc(scene.sample(samp, uv - float2(2.0f*step, 0.0f)).rgb);
         float3 ycc_l1 = rgb_to_ycc(scene.sample(samp, uv - float2(1.0f*step, 0.0f)).rgb);