egl-configs: get the number of configs

support/android/egl-configs/src/main.rs

@@ -1,5 +1,8 @@
-mod ffi;
 use ffi::*;
+use ffi::types::*;
+use std::ptr::null_mut;
+
+mod ffi;
 
 fn main() {
     unsafe {
@@ -7,6 +10,31 @@ fn main() {
     }
 }
 
-unsafe fn run() {
+macro_rules! check {
-    let _display = GetDisplay(DEFAULT_DISPLAY as *mut _);
+    ($name: ident ( $($arg: expr),* )) => {
+        check($name( $($arg),* ), stringify!($name))
+    }
+}
+
+unsafe fn run() {
+    let display = GetDisplay(DEFAULT_DISPLAY as *mut _);
+    assert!(!display.is_null());
+
+    check!(Initialize(display, null_mut(), null_mut()));
+
+    let mut num_config = -1;
+    check!(GetConfigs(display, null_mut(), 0, &mut num_config));
+    println!("Got {} configs", num_config);
+}
+
+unsafe fn check(result: EGLBoolean, function_name: &str) {
+    check_error();
+    assert_eq!(result, TRUE, "{} failed", function_name);
+}
+
+unsafe fn check_error() {
+    let status = GetError();
+    if status != SUCCESS as i32 {
+        println!("Error: 0x{:x}", status);
+    }
 }