name: Patch V36 Retail Soft

on:
  push:
    branches:
      - test/v36-retail-jfa-soft

permissions:
  contents: write

jobs:
  patch:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          ref: test/v36-retail-jfa-soft
      - name: Apply conservative V36 decode patch
        shell: bash
        run: |
          set -euo pipefail
          python3 <<'PY'
          from pathlib import Path
          p = Path('src/outline/d3d9_hook.zig')
          s = p.read_text()
          if 'V36 RETAIL-SOFT' in s:
              raise SystemExit(0)

          old = '''/// V32 POLISH: hard 3px outline, no feather.
/// c0 = (screen_width, screen_height, radius_px=3, 0).
/// The shader squares radius_px and emits a binary 0/1 edge alpha.
const jfa_decode_src =
    "ps_3_0\\n" ++
    "def c1, 0.0, 1.0, -0.002, 0.0\\n" ++
    "dcl_2d s0\\n" ++
    "dcl_2d s1\\n" ++
    "dcl_texcoord0 v0\\n" ++
    // Nearest seed and pixel-space squared distance.
    "texld r0, v0, s0\\n" ++
    "sub r1.xy, v0.xy, r0.xy\\n" ++
    "mul r1.xy, r1.xy, c0.xy\\n" ++
    "dp2add r1.z, r1, r1, c0.w\\n" ++
    // Seed colour.
    "texld r2, r0, s1\\n" ++
    // Hard radius test: dist² < radius² => alpha 1, otherwise 0.
    "mov r3.x, c0.z\\n" ++
    "mul r3.x, r3.x, r3.x\\n" ++
    "sub r3.y, r1.z, r3.x\\n" ++
    "mov r6.w, c1.y\\n" ++
    "cmp r4.w, r3.y, c0.w, r6.w\\n" ++
    // Do not paint over the model interior.
    "texld r5, v0, s1\\n" ++
    "add r5.x, r5.a, c1.z\\n" ++
    "cmp r4.w, r5.x, c0.w, r4.w\\n" ++
    "mov r4.xyz, r2.xyz\\n" ++
    "mov oC0, r4\\n";'''

          new = '''/// V36 RETAIL-SOFT: keep the proven V34 JFA, soften only final decode.
/// c0 = (screen_width, screen_height, core_radius_px, halo_radius_px).
/// Uses the same two texture reads as V34: no 17-tap full-screen morphology.
const jfa_decode_src =
    "ps_3_0\\n" ++
    "def c1, 0.0, 0.22, 0.82, -0.002\\n" ++
    "def c2, 1.0, 0.95, 0.58, 0.0\\n" ++
    "dcl_2d s0\\n" ++
    "dcl_2d s1\\n" ++
    "dcl_texcoord0 v0\\n" ++
    "texld r0, v0, s0\\n" ++
    "sub r1.xy, v0.xy, r0.xy\\n" ++
    "mul r1.xy, r1.xy, c0.xy\\n" ++
    "dp2add r1.z, r1, r1, c1.x\\n" ++
    "mul r3.x, c0.z, c0.z\\n" ++
    "mul r3.y, c0.w, c0.w\\n" ++
    "sub r4.x, r1.z, r3.y\\n" ++
    "cmp r6.w, r4.x, c1.x, c1.y\\n" ++
    "sub r4.x, r1.z, r3.x\\n" ++
    "cmp r6.w, r4.x, r6.w, c1.z\\n" ++
    "texld r5, v0, s1\\n" ++
    "add r5.x, r5.a, c1.w\\n" ++
    "cmp r6.w, r5.x, c1.x, r6.w\\n" ++
    "mov r6.xyz, c2.xyz\\n" ++
    "mov oC0, r6\\n";'''

          if old not in s:
              raise SystemExit('Expected V34 decode block not found')
          s = s.replace(old, new)

          old_cpu = '''        // V34: hard 3px edge unchanged; JFA seed precision is now full-float.
        c0 = [4]f32{ fw, fh, 3.0, 0.0 };'''
          new_cpu = '''        // V36: thin 1.5px core plus a subtle 3px halo.
        c0 = [4]f32{ fw, fh, 1.5, 3.0 };'''
          if old_cpu not in s:
              raise SystemExit('Expected V34 decode constants not found')
          s = s.replace(old_cpu, new_cpu)
          p.write_text(s)
          PY
      - name: Commit patch
        shell: bash
        run: |
          set -euo pipefail
          if git diff --quiet; then exit 0; fi
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add src/outline/d3d9_hook.zig
          git commit -m "V36: soft Retail-style JFA decode"
          git push origin HEAD:test/v36-retail-jfa-soft