2021-04-20 07:21:44 +10:00
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use std::ffi::CStr;
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use std::ffi::CString;
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#[allow(
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non_upper_case_globals,
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dead_code,
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non_camel_case_types,
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non_snake_case
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)]
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mod bindings {
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2021-05-23 14:06:35 +10:00
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include!(concat!(env!("OUT_DIR"), "/runner-bindings.rs"));
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2021-04-20 07:21:44 +10:00
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}
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pub struct MGBA {
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mgba: *mut bindings::MGBA,
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}
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pub struct VideoBuffer {
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width: u32,
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height: u32,
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buffer: *mut u32,
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}
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impl VideoBuffer {
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pub fn get_size(&self) -> (u32, u32) {
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(self.width, self.height)
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}
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pub fn get_pixel(&self, x: u32, y: u32) -> u32 {
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let offset = (y * self.width + x) as isize;
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assert!(x < self.width, "x must be in range 0 to {}", self.width);
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assert!(y < self.height, "y must be in range 0 to {}", self.height);
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unsafe { *self.buffer.offset(offset) }
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}
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}
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impl MGBA {
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pub fn new(filename: &str) -> Self {
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unsafe { bindings::set_logger(Some(logger)) };
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let c_str = CString::new(filename).expect("should be able to make cstring from filename");
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MGBA {
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mgba: unsafe { bindings::new_runner(c_str.as_ptr() as *mut i8) },
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}
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}
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pub fn get_video_buffer(&self) -> VideoBuffer {
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let c_video_buffer = unsafe { bindings::get_video_buffer(self.mgba) };
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VideoBuffer {
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width: c_video_buffer.width,
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height: c_video_buffer.height,
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buffer: c_video_buffer.buffer,
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}
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}
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pub fn advance_frame(&mut self) {
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unsafe { bindings::advance_frame(self.mgba) }
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}
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}
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static mut CALLBACK: Option<Box<dyn Fn(&str)>> = None;
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pub fn set_logger(x: Box<dyn Fn(&str)>) {
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unsafe {
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assert!(CALLBACK.is_none());
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CALLBACK = Some(x);
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}
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}
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pub fn clear_logger() {
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unsafe { CALLBACK = None }
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}
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extern "C" fn logger(c_str: *mut i8) {
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unsafe {
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if let Some(f) = &CALLBACK {
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f(CStr::from_ptr(c_str)
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.to_str()
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.expect("should be able to convert logging message to rust String"));
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}
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}
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}
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impl Drop for MGBA {
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fn drop(&mut self) {
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unsafe { bindings::free_runner(self.mgba) }
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}
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}
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