Avoid the need to hard-reset the Dreamcast to exit the sample

samples/depth_funcs_alpha_testing/main.c

@@ -1,3 +1,7 @@
+#ifdef __DREAMCAST__
+#include <kos.h>
+#endif
+
 #include "GL/gl.h"
 #include "GL/glu.h"
 #include "GL/glkos.h"
@@ -94,6 +98,24 @@ void DrawGLScene()
     glKosSwapBuffers();
 }
 
+int check_start() {
+#ifdef __DREAMCAST__
+    maple_device_t *cont;
+    cont_state_t *state;
+
+    cont = maple_enum_type(0, MAPLE_FUNC_CONTROLLER);
+
+    if(cont) {
+        state = (cont_state_t *)maple_dev_status(cont);
+
+        if(state)
+            return state->buttons & CONT_START;
+    }
+#endif
+
+    return 0;
+}
+
 int main(int argc, char **argv)
 {
     glKosInit();
@@ -104,6 +126,9 @@ int main(int argc, char **argv)
     ReSizeGLScene(640, 480);
     DrawGLScene();
     while(1) {
+      if(check_start())
+        break;
+
       DrawGLScene();
     }