egl-configs: print all config attributes

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

@@ -25,6 +25,62 @@ unsafe fn run() {
     let mut num_config = -1;
     check!(GetConfigs(display, null_mut(), 0, &mut num_config));
     println!("Got {} configs", num_config);
+    assert!(num_config >= 0);
+
+    let mut configs = Vec::with_capacity(num_config as usize);
+    let mut num_config2 = -1;
+    check!(GetConfigs(display, configs.as_mut_ptr(), num_config, &mut num_config2));
+    assert_eq!(num_config, num_config2);
+    configs.set_len(num_config as usize);
+
+    for (i, &config) in configs.iter().enumerate() {
+        println!("Config #{}", i + 1);
+
+        macro_rules! to_pairs {
+            ($($name: ident)*) => {
+                 &[ $( (stringify!($name), $name) ),* ]
+            }
+        }
+        // https://www.khronos.org/registry/EGL/sdk/docs/man/html/eglGetConfigAttrib.xhtml#description
+        for &(attr_name, attr) in to_pairs! [
+            ALPHA_SIZE
+            ALPHA_MASK_SIZE
+            BIND_TO_TEXTURE_RGB
+            BIND_TO_TEXTURE_RGBA
+            BLUE_SIZE
+            BUFFER_SIZE
+            COLOR_BUFFER_TYPE
+            CONFIG_CAVEAT
+            CONFIG_ID
+            CONFORMANT
+            DEPTH_SIZE
+            GREEN_SIZE
+            LEVEL
+            LUMINANCE_SIZE
+            MAX_PBUFFER_WIDTH
+            MAX_PBUFFER_HEIGHT
+            MAX_PBUFFER_PIXELS
+            MAX_SWAP_INTERVAL
+            MIN_SWAP_INTERVAL
+            NATIVE_RENDERABLE
+            NATIVE_VISUAL_ID
+            NATIVE_VISUAL_TYPE
+            RED_SIZE
+            RENDERABLE_TYPE
+            SAMPLE_BUFFERS
+            SAMPLES
+            STENCIL_SIZE
+            SURFACE_TYPE
+            TRANSPARENT_TYPE
+            TRANSPARENT_RED_VALUE
+            TRANSPARENT_GREEN_VALUE
+            TRANSPARENT_BLUE_VALUE
+        ] {
+            let mut value = -1;
+            check!(GetConfigAttrib(display, config, attr as i32, &mut value));
+            println!("    {} = {}", attr_name, value)
+        }
+    }
 }
 
 unsafe fn check(result: EGLBoolean, function_name: &str) {
@@ -35,6 +91,6 @@ unsafe fn check(result: EGLBoolean, function_name: &str) {
 unsafe fn check_error() {
     let status = GetError();
     if status != SUCCESS as i32 {
-        println!("Error: 0x{:x}", status);
+        panic!("Error: 0x{:x}", status);
     }
 }