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feat(viewer): world cubemap (skybox) viewer — 6-face grid

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TXCM XPR2 resources are the game's world skyboxes (BG_Acheron, BG_Hargenteen,
…). The viewer showed only face 0 as a flat 2D image; now it decodes all 6 faces
and shows a labelled grid.

Formats (Bevy-free): X360Texture::cube_faces_from_xpr2() returns a Cubemap with 6
faces in D3D9 order (+X −X +Y −Y +Z −Z), or None for ordinary 2D textures. Face
layout derived from xenia's GetGuestTextureLayout — 6 back-to-back independently-
tiled surfaces, per-face stride = tiled-surface-size aligned to the 4 KiB
subresource boundary (kTextureSubresourceAlignmentBytes). Verified against real
BG_Acheron: data_size == 6 × 0x400000, and all 6 faces decode cleanly (own
Python decode + a disc test asserting 6×4 MiB faces and face 0 == the validated
from_xpr2 green-planet decode). Extracted a shared decode_surface() helper so the
2D and cube paths are byte-identical; from_xpr2 output unchanged (re-verified).

Viewer: new SkyboxPreview resource (6 egui face textures, reusing the existing
per-format x360_texture_to_bevy_image); populated in apply_loaded_texture's TXCM
branch; freed/reset alongside the other previews (factored free_texture/
free_skybox helpers). Central panel gains a skybox branch rendering a 3-column
labelled face grid.

DEFERRED (per "do not guess, else defer"): the interactive 3D skybox. Face data +
D3D9 order are validated, but wgpu cube-sampling handedness can't be confirmed
without eyeballing the GUI — a wrong-oriented skybox is worse than the correct
labelled grid. The grid is the reliable deliverable; the 3D look-around is a
follow-up once orientation is visually confirmed.

(Background agent did the investigation/validation but was blocked from writing
files; implemented here in the main tree from its findings, independently
re-verified.)

23 formats tests + disc cubemap test pass; viewer/CLI build; face-0 export
re-verified as the green planet.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
MechaCat02
2026-07-11 13:38:07 +02:00
parent 765e4a573b
commit 589659bec6
4 changed files with 326 additions and 71 deletions
Download Patch File Download Diff File Expand all files Collapse all files

116
crates/sylpheed-viewer/src/iso_loader.rs
View File

@@ -131,6 +131,23 @@ pub struct PakDetail {
pub fields: Vec<(String, String)>,
}
/// One decoded cubemap face, registered as an egui image.
pub struct FaceTex {
pub label: &'static str,
pub handle: Handle<Image>,
pub egui_id: egui::TextureId,
pub width: u32,
pub height: u32,
}
/// The currently-open world cubemap (`TXCM`), shown as a labelled 6-face grid.
#[derive(Resource, Default)]
pub struct SkyboxPreview {
pub faces: Vec<FaceTex>,
/// Header summary (dimensions / format).
pub info: String,
}
/// The currently-open IPFB data pack, shown as a master-detail browser.
#[derive(Resource, Default)]
pub struct PakView {
@@ -237,7 +254,8 @@ impl Plugin for IsoLoaderPlugin {
// Registered unconditionally (even on wasm, where the load systems
// below are cfg'd out) so the UI can always read them.
.init_resource::<TextPreview>()
.init_resource::<PakView>();
.init_resource::<PakView>()
.init_resource::<SkyboxPreview>();
#[cfg(not(target_arch = "wasm32"))]
{
@@ -621,14 +639,43 @@ fn poll_loader_channel(
}
}
/// Free the current texture preview's GPU image + egui slot and reset it.
#[cfg(not(target_arch = "wasm32"))]
fn free_texture(
preview: &mut TexturePreview,
images: &mut Assets<Image>,
contexts: &mut bevy_egui::EguiContexts<'_, '_>,
) {
if let Some(ref handle) = preview.handle {
contexts.remove_image(handle);
images.remove(handle.id());
}
*preview = TexturePreview::default();
}
/// Free the current skybox preview's per-face GPU images + egui slots and reset it.
#[cfg(not(target_arch = "wasm32"))]
fn free_skybox(
skybox: &mut SkyboxPreview,
images: &mut Assets<Image>,
contexts: &mut bevy_egui::EguiContexts<'_, '_>,
) {
for f in &skybox.faces {
contexts.remove_image(&f.handle);
images.remove(f.handle.id());
}
*skybox = SkyboxPreview::default();
}
/// Converts pending raw bytes into a Bevy `Image`, registers it with egui,
/// and populates `TexturePreview` / `FileInfo`.
/// and populates `TexturePreview` / `SkyboxPreview` / `FileInfo`.
#[cfg(not(target_arch = "wasm32"))]
fn apply_loaded_texture(
mut pending: ResMut<PendingFileBytes>,
mut preview: ResMut<TexturePreview>,
mut text_preview: ResMut<TextPreview>,
mut pak_view: ResMut<PakView>,
mut skybox: ResMut<SkyboxPreview>,
mut file_info: ResMut<FileInfo>,
mut images: ResMut<Assets<Image>>,
mut contexts: bevy_egui::EguiContexts,
@@ -643,13 +690,10 @@ fn apply_loaded_texture(
let fmt = sylpheed_formats::vfs::identify_format(&bytes);
// Always free the previous texture first (GPU memory + egui slot), and clear
// the other previews so exactly one viewer is active per selection.
if let Some(ref handle) = preview.handle {
contexts.remove_image(handle);
images.remove(handle.id());
}
*preview = TexturePreview::default();
// Always free the previous previews (GPU memory + egui slots) so exactly one
// viewer is active per selection.
free_texture(&mut preview, &mut images, &mut contexts);
free_skybox(&mut skybox, &mut images, &mut contexts);
*text_preview = TextPreview::default();
*pak_view = PakView::default();
@@ -685,6 +729,48 @@ fn apply_loaded_texture(
return; // Not a texture — FileInfo is sufficient
}
// World cubemap (`TXCM`) → decode all 6 faces and show a labelled grid.
// Returns `None` for ordinary 2D textures, which fall through below.
match sylpheed_formats::texture::X360Texture::cube_faces_from_xpr2(&bytes) {
Ok(Some(cube)) => {
use sylpheed_formats::texture::{Cubemap, X360Texture};
for (i, face) in cube.faces.iter().enumerate() {
let face_tex = X360Texture {
width: cube.width,
height: cube.height,
format: cube.format,
mip_levels: 1,
is_cubemap: false,
data: face.clone(),
};
if let Ok(img) = crate::asset_loader::x360_texture_to_bevy_image(face_tex) {
let handle = images.add(img);
let egui_id = contexts.add_image(handle.clone_weak());
skybox.faces.push(FaceTex {
label: Cubemap::face_label(i),
handle,
egui_id,
width: cube.width,
height: cube.height,
});
}
}
skybox.info = format!(
"Cubemap {}×{} {:?} · {} faces",
cube.width,
cube.height,
cube.format,
skybox.faces.len()
);
return;
}
Ok(None) => {} // ordinary 2D texture
Err(e) => {
preview.format_info = format!("Cubemap parse failed: {e}");
return;
}
}
let tex = match sylpheed_formats::X360Texture::from_xpr2(&bytes) {
Ok(t) => t,
Err(e) => {
@@ -724,6 +810,7 @@ fn apply_pak(
mut pak_view: ResMut<PakView>,
mut preview: ResMut<TexturePreview>,
mut text_preview: ResMut<TextPreview>,
mut skybox: ResMut<SkyboxPreview>,
mut file_info: ResMut<FileInfo>,
mut images: ResMut<Assets<Image>>,
mut contexts: bevy_egui::EguiContexts,
@@ -733,13 +820,10 @@ fn apply_pak(
}
pending.ready = false;
// Free any previous texture + clear the other previews (mirrors the texture
// path) so exactly one viewer is active.
if let Some(ref handle) = preview.handle {
contexts.remove_image(handle);
images.remove(handle.id());
}
*preview = TexturePreview::default();
// Free any previous texture/skybox + clear the other previews (mirrors the
// texture path) so exactly one viewer is active.
free_texture(&mut preview, &mut images, &mut contexts);
free_skybox(&mut skybox, &mut images, &mut contexts);
*text_preview = TextPreview::default();
file_info.name = pending.name.clone();