chore: better lib structure

frontends/libretro/src/lib.rs

 #![allow(clippy::uninlined_format_args)]
 
-use std::os::raw::{c_char, c_uint, c_void};
+use std::os::raw::{c_char, c_uint};
 
 const RETRO_API_VERSION: u32 = 1;
 
 #[repr(C)]
-pub struct retro_system_info {
+pub struct RetroSystemInfo {
     pub library_name: *const c_char,
     pub library_version: *const c_char,
     pub valid_extensions: *const c_char,
@@ -13,53 +13,19 @@ pub struct retro_system_info {
     pub block_extract: bool,
 }
 
-#[repr(C)]
-pub struct retro_game_geometry {
-    pub base_width: u32,
-    pub base_height: u32,
-    pub max_width: u32,
-    pub max_height: u32,
-    pub aspect_ratio: f32,
-}
-
-#[repr(C)]
-pub struct retro_system_timing {
-    pub fps: f64,
-    pub sample_rate: f64,
-}
-
-#[repr(C)]
-pub struct retro_system_api {
-    pub retro_api_version: u32,
-    pub retro_get_system_info: extern "C" fn(*mut retro_system_info),
-    pub retro_set_environment: extern "C" fn(extern "C" fn(u32, *const c_void), *const c_void),
-    pub retro_set_video_refresh: extern "C" fn(extern "C" fn()),
-    pub retro_set_audio_sample: extern "C" fn(extern "C" fn(i16)),
-    pub retro_set_audio_sample_batch: extern "C" fn(extern "C" fn(*const i16, usize)),
-    pub retro_set_input_poll: extern "C" fn(extern "C" fn()),
-    pub retro_set_input_state: extern "C" fn(extern "C" fn(u32, u32, u16, i16) -> i16),
-    // Add other Libretro core functions here as needed
+#[no_mangle]
+pub extern "C" fn retro_init() {
+    println!("retro_init()");
 }
 
 #[no_mangle]
-pub extern "C" fn retro_get_system_info(info: *mut retro_system_info) {
-    println!("retro_get_system_info");
-    unsafe {
-        (*info).library_name = "Boytacean\0".as_ptr() as *const c_char;
-        (*info).library_version = "v0.9.6\0".as_ptr() as *const c_char;
-        (*info).valid_extensions = "gb|gbc\0".as_ptr() as *const c_char;
-        (*info).need_fullpath = false;
-        (*info).block_extract = false;
-    }
+pub extern "C" fn retro_deinit() {
+    println!("retro_deinit()");
 }
 
 #[no_mangle]
-pub extern "C" fn retro_set_environment(
-    _callback: extern "C" fn(u32, *const c_void),
-    _data: *const c_void,
-) {
-    // Set any environment variables or configuration options here if needed
-    // For example, you might handle system RAM allocation using this function
+pub extern "C" fn retro_reset() {
+    println!("retro_reset()");
 }
 
 #[no_mangle]
@@ -69,16 +35,13 @@ pub extern "C" fn retro_api_version() -> c_uint {
 }
 
 #[no_mangle]
-pub extern "C" fn retro_init() {
-    println!("retro_init()");
-}
-
-#[no_mangle]
-pub extern "C" fn retro_deinit() {
-    println!("retro_deinit()");
-}
-
-#[no_mangle]
-pub extern "C" fn retro_reset() {
-    println!("retro_reset()");
+pub extern "C" fn retro_get_system_info(info: *mut RetroSystemInfo) {
+    println!("retro_get_system_info");
+    unsafe {
+        (*info).library_name = "Boytacean\0".as_ptr() as *const c_char;
+        (*info).library_version = "v0.9.6\0".as_ptr() as *const c_char;
+        (*info).valid_extensions = "gb|gbc\0".as_ptr() as *const c_char;
+        (*info).need_fullpath = false;
+        (*info).block_extract = false;
+    }
 }