feat(render-core): add default UV scale and refactor UV mapping logic

- Introduced a constant `DEFAULT_UV_SCALE` for UV scaling.
- Refactored UV mapping in `build_render_mesh` to use the new constant.
- Simplified `compute_bounds` functions by extracting common logic into `compute_bounds_impl`.

test(render-core): add tests for rendering with empty and multi-node models

- Added tests to verify behavior when building render meshes from models with no slots and multiple nodes.
- Ensured UV scaling is correctly applied in tests.

feat(render-demo): add FOV argument and improve error handling

- Added a `--fov` command-line argument to set the field of view.
- Enhanced error messages for texture resolution failures.
- Updated MVP computation to use the new FOV parameter.

fix(rsli): improve error handling in LZH decompression

- Added checks to prevent out-of-bounds access in LZH decoding logic.

refactor(texm): streamline texture parsing and decoding tests

- Created a helper function `build_texm_payload` for constructing test payloads.
- Added tests for various texture formats including RGB565, RGB556, ARGB4444, and Luminance Alpha.
- Improved error handling for invalid TEXM headers and mip bounds.

1 files changed, 5 insertions, 9 deletions

diff --git a/crates/texm/src/lib.rs b/crates/texm/src/lib.rs
index 5d8b594..7a166f3 100644
--- a/crates/texm/src/lib.rs
+++ b/crates/texm/src/lib.rs
@@ -36,6 +36,7 @@ impl PixelFormat {
         match self {
             Self::Indexed8 => 1,
             Self::Rgb565 | Self::Rgb556 | Self::Argb4444 | Self::LuminanceAlpha88 => 2,
+            // Parkan stores format 888 as 32-bit RGBX in texture payloads.
             Self::Rgb888 | Self::Argb8888 => 4,
         }
     }
@@ -173,14 +174,8 @@ pub fn parse_texm(payload: &[u8]) -> Result<Texture> {
             offset: level_offset,
             size: level_size,
         });
-        w = w.max(1) >> 1;
-        h = h.max(1) >> 1;
-        if w == 0 {
-            w = 1;
-        }
-        if h == 0 {
-            h = 1;
-        }
+        w = (w >> 1).max(1);
+        h = (h >> 1).max(1);
     }
 
     let page_rects = parse_page_tail(payload, offset)?;
@@ -240,7 +235,8 @@ pub fn decode_mip_rgba8(texture: &Texture, payload: &[u8], mip_index: usize) ->
                     break;
                 }
                 let poff = usize::from(index).saturating_mul(4);
-                if poff + 3 >= palette.len() {
+                // Keep this form to accept the last palette item (index 255).
+                if poff + 4 > palette.len() {
                     continue;
                 }
                 let out = i.saturating_mul(4);