From a2ca2b682741a667a5165dc749f49845b6149dee Mon Sep 17 00:00:00 2001
From: Evan Pratten <ewpratten@gmail.com>
Date: Thu, 30 Sep 2021 10:18:50 -0400
Subject: [PATCH] working on err handling

---
 game/Cargo.toml                 |  2 ++
 game/src/utilities/datastore.rs | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/game/Cargo.toml b/game/Cargo.toml
index a220020..dfb38f6 100644
--- a/game/Cargo.toml
+++ b/game/Cargo.toml
@@ -21,6 +21,8 @@ puffin_http = "0.6"
 dirty-fsm = "^0.2.2"
 num-traits = "0.2"
 sentry = "0.23"
+image = "0.23"
+tempfile = "3.2"
 
 [dev-dependencies]
 puffin_viewer = "0.6"
diff --git a/game/src/utilities/datastore.rs b/game/src/utilities/datastore.rs
index 2c0ce0f..c037967 100644
--- a/game/src/utilities/datastore.rs
+++ b/game/src/utilities/datastore.rs
@@ -1,3 +1,47 @@
+use std::io::Write;
+
+use raylib::{texture::Texture2D, RaylibHandle, RaylibThread};
+use tempfile::{tempfile, NamedTempFile};
+
+/// Contains all game assets.
+///
+/// This uses macro magic to automatically embed the contents of `game/assets/` into the executable
+/// file so we only have to distribute a single file, instead of a game and its assets separately
 #[derive(rust_embed::RustEmbed)]
 #[folder = "assets"]
 pub struct StaticGameData;
+
+#[derive(Debug, Error)]
+pub enum ResourceLoadError {
+    #[error(transparent)]
+    Io(#[from] std::io::Error),
+    #[error("Could not load embedded asset: {0}")]
+    AssetNotFound(String),
+    #[error("Generic error: {0}")]
+    Generic(String),
+}
+
+pub fn load_texture_from_internal_data(
+    raylib_handle: &RaylibHandle,
+    thread: &RaylibThread,
+    path: &str,
+) -> Result<Texture2D, ResourceLoadError> {
+    // Create a temp file path to work with
+    let tmp_path = NamedTempFile::new()?.into_temp_path();
+
+    // Unpack the raw image data to a real file on the local filesystem so raylib will read it correctly
+    std::fs::write(
+        tmp_path,
+        &StaticGameData::get(path)
+            .ok_or(ResourceLoadError::AssetNotFound(path.to_string()))?
+            .data,
+    )?;
+
+    // Call through via FFI to re-load the file
+    let texture = raylib_handle.load_texture(thread, tmp_path.to_str().unwrap()).map_err(|e| ResourceLoadError::Generic(e));
+
+    // Close the file
+    tmp_path.close()?;
+
+    Ok(texture)
+}