Launcher backgrounds drawn by tools/make-title-art.py

pic0.dds and pic1.dds had been converted from a background image whose
origin was not recorded. They are now a gradient drawn from arithmetic alone
by tools/make-title-art.py (BC7 mode 6 blocks, each one colour, so no texture
compressor is needed and the files are the same on every machine), and the
notices name that script as their origin.

tooling/notices/components.json

@@ -16,7 +16,7 @@
       "name": "PS5 RetroArch (this port: title code, platform integration, build scripts and patches)",
       "kind": "code",
       "always": true,
-      "artifacts": ["eboot.bin", "retroarch.cfg", "sce_sys/param.json"],
+      "artifacts": ["eboot.bin", "retroarch.cfg", "LEGAL.txt", "sce_sys/param.json"],
       "licence": "GPL-3.0-or-later",
       "copyright": [
         "Copyright (C) 2026 Mihawk",
@@ -180,10 +180,10 @@
       "kind": "asset",
       "artifacts": ["sce_sys/icon0.png", "sce_sys/pic0.dds", "sce_sys/pic1.dds", "sce_sys/snd0.at9"],
       "licence": "see modifications",
-      "copyright": ["snd0.at9: Copyright (C) 2026 BlackBearReloaded, GPL-3.0-or-later according to ps5-native-app-boilerplate's NOTICE.md"],
+      "copyright": ["pic0.dds, pic1.dds: Copyright (C) 2026 Mihawk, GPL-3.0-or-later (drawn by tools/make-title-art.py)", "snd0.at9: Copyright (C) 2026 BlackBearReloaded, GPL-3.0-or-later according to ps5-native-app-boilerplate's NOTICE.md"],
       "texts": [],
       "source": {"kind": "git", "path": ".", "remote": "https://github.com/mihawk-99/PS5_RetroArch"},
-      "modifications": "icon0.png is the RetroArch logo (libretro's branding); pic0.dds and pic1.dds were converted from a background image whose origin is not recorded (docs/releases/SOURCE_CORRESPONDENCE.md); snd0.at9 is ps5-native-app-boilerplate's default selection track."
+      "modifications": "icon0.png is the RetroArch logo (libretro's branding); pic0.dds and pic1.dds are a gradient background drawn from nothing but arithmetic by tools/make-title-art.py in this repository (they replaced, in v0.5.6-alpha.5, a background whose origin was not recorded); snd0.at9 is ps5-native-app-boilerplate's default selection track."
     },
     {
       "id": "fceumm",

tools/make-title-art.py

@@ -0,0 +1,118 @@
+#!/usr/bin/env python3
+# PS5 RetroArch - make the launcher backgrounds (sce_sys/pic0.dds, pic1.dds).
+# Copyright (C) 2026 Mihawk-99
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# The backgrounds are drawn here, from nothing but arithmetic, so their origin
+# is this script: a dark gradient with a soft glow, 3840x2160, in the format the
+# launcher reads (DDS, DX10 header, BC7_UNORM, one level).
+#
+# Each 4x4 block is one colour, which BC7's mode 6 holds exactly (both
+# endpoints that colour, every index 0), so no texture compressor is needed
+# and the output is the same on every machine. At 4K a 4x4 step is invisible
+# in a gradient this gentle.
+#
+#   python3 tools/make-title-art.py            write sce_sys/pic0.dds and pic1.dds
+#   python3 tools/make-title-art.py --png DIR  also write PNG previews to DIR
+import struct
+import sys
+from pathlib import Path
+
+import numpy as np
+
+WIDTH, HEIGHT = 3840, 2160
+ROOT = Path(__file__).resolve().parent.parent
+
+
+def draw(variant: int) -> np.ndarray:
+    """The picture, one RGB colour per 4x4 block (HEIGHT/4 x WIDTH/4 x 3, 0..1)."""
+    by, bx = HEIGHT // 4, WIDTH // 4
+    y, x = np.mgrid[0:by, 0:bx].astype(np.float64)
+    u, v = x / (bx - 1), y / (by - 1)
+    # A diagonal from deep navy to a dark violet
+    top = np.array([0.035, 0.045, 0.110])
+    bottom = np.array([0.095, 0.040, 0.140])
+    t = np.clip(0.55 * u + 0.45 * v, 0.0, 1.0)[..., None]
+    rgb = top * (1 - t) + bottom * t
+    # A soft glow, placed differently in the two pictures
+    cx, cy = (0.30, 0.38) if variant == 0 else (0.70, 0.62)
+    d2 = ((u - cx) * 16 / 9) ** 2 + (v - cy) ** 2
+    glow = np.exp(-d2 / 0.09)[..., None]
+    rgb = rgb + glow * np.array([0.10, 0.14, 0.26])
+    # A second, fainter glow in a warmer tone
+    d2b = ((u - (1 - cx)) * 16 / 9) ** 2 + (v - (1 - cy)) ** 2
+    rgb = rgb + np.exp(-d2b / 0.05)[..., None] * np.array([0.09, 0.04, 0.10])
+    # A gentle vignette
+    r2 = ((u - 0.5) * 16 / 9) ** 2 + (v - 0.5) ** 2
+    rgb = rgb * (1.0 - 0.35 * np.clip(r2 / 1.1, 0, 1))[..., None]
+    return np.clip(rgb, 0.0, 1.0)
+
+
+def bc7_mode6_solid(blocks: np.ndarray) -> bytes:
+    """BC7 blocks, each one solid colour (8-bit values, odd, alpha 255)."""
+    c = np.round(blocks * 255).astype(np.uint32)
+    c = c | 1                             # the p-bit (1, for alpha 255) is each value's lowest bit
+    c7 = c >> 1                           # the 7 stored bits
+    r, g, b = c7[..., 0].ravel(), c7[..., 1].ravel(), c7[..., 2].ravel()
+    a = np.full_like(r, 127)
+    # Mode 6: bits 0-6 the mode (bit 6 set), then R0 R1 G0 G1 B0 B1 A0 A1 (7 each),
+    # P0 P1, then the indices (all 0). Bits count from the low end of the block.
+    lo = np.full(r.shape, 1 << 6, dtype=np.uint64)
+    hi = np.zeros(r.shape, dtype=np.uint64)
+    fields = [r, r, g, g, b, b, a, a]
+    pos = 7
+    for field in fields:
+        for bit in range(7):
+            value = ((field >> bit) & 1).astype(np.uint64)
+            if pos < 64:
+                lo |= value << np.uint64(pos)
+            else:
+                hi |= value << np.uint64(pos - 64)
+            pos += 1
+    for _ in range(2):                    # P0, P1
+        if pos < 64:
+            lo |= np.uint64(1) << np.uint64(pos)
+        else:
+            hi |= np.uint64(1) << np.uint64(pos - 64)
+        pos += 1
+    out = np.empty(r.shape[0] * 2, dtype="<u8")
+    out[0::2], out[1::2] = lo, hi
+    return out.tobytes()
+
+
+def dds_header() -> bytes:
+    """DDS with a DX10 header: BC7_UNORM (98), 2D, one level."""
+    DDSD_CAPS, DDSD_HEIGHT, DDSD_WIDTH, DDSD_PIXELFORMAT, DDSD_LINEARSIZE = 0x1, 0x2, 0x4, 0x1000, 0x80000
+    flags = DDSD_CAPS | DDSD_HEIGHT | DDSD_WIDTH | DDSD_PIXELFORMAT | DDSD_LINEARSIZE
+    linear = WIDTH * HEIGHT               # BC7: 16 bytes a 4x4 block, one byte a pixel
+    header = struct.pack("<4sIIIIIII", b"DDS ", 124, flags, HEIGHT, WIDTH, linear, 0, 1)
+    header += b"\0" * 44                  # reserved
+    header += struct.pack("<II4sIIIII", 32, 0x4, b"DX10", 0, 0, 0, 0, 0)
+    header += struct.pack("<IIIII", 0x1000, 0, 0, 0, 0)   # caps: texture
+    header += struct.pack("<IIIII", 98, 3, 0, 1, 0)       # BC7_UNORM, TEXTURE2D, array 1
+    assert len(header) == 148
+    return header
+
+
+def main() -> int:
+    png_dir = None
+    if len(sys.argv) == 3 and sys.argv[1] == "--png":
+        png_dir = Path(sys.argv[2])
+    elif len(sys.argv) != 1:
+        print(__doc__ or "usage: make-title-art.py [--png DIR]", file=sys.stderr)
+        return 2
+    for variant, name in ((0, "pic0.dds"), (1, "pic1.dds")):
+        blocks = draw(variant)
+        data = dds_header() + bc7_mode6_solid(blocks)
+        (ROOT / "sce_sys" / name).write_bytes(data)
+        print(f"sce_sys/{name}: {len(data)} bytes")
+        if png_dir:
+            from PIL import Image
+            png_dir.mkdir(parents=True, exist_ok=True)
+            pixels = ((np.round(blocks * 255).astype(np.uint8)) | 1).repeat(4, axis=0).repeat(4, axis=1)
+            Image.fromarray(pixels, "RGB").save(png_dir / name.replace(".dds", ".png"))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())