Properly link flecs library

engine/libs/flecs/examples/c/systems/delta_time/include/delta_time.h

@@ -0,0 +1,16 @@
+#ifndef DELTA_TIME_H
+#define DELTA_TIME_H
+
+/* This generated file contains includes for project dependencies */
+#include "delta_time/bake_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+

engine/libs/flecs/examples/c/systems/delta_time/include/delta_time/bake_config.h

@@ -0,0 +1,24 @@
+/*
+                                   )
+                                  (.)
+                                  .|.
+                                  | |
+                              _.--| |--._
+                           .-';  ;`-'& ; `&.
+                          \   &  ;    &   &_/
+                           |"""---...---"""|
+                           \ | | | | | | | /
+                            `---.|.|.|.---'
+
+ * This file is generated by bake.lang.c for your convenience. Headers of
+ * dependencies will automatically show up in this file. Include bake_config.h
+ * in your main project file. Do not edit! */
+
+#ifndef DELTA_TIME_BAKE_CONFIG_H
+#define DELTA_TIME_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

engine/libs/flecs/examples/c/systems/delta_time/project.json

@@ -0,0 +1,12 @@
+{
+    "id": "delta_time",
+    "type": "application",
+    "value": {
+        "author": "Jane Doe",
+        "description": "A simple hello world flecs application",
+        "use": [
+            "flecs"
+        ],
+        "public": false
+    }
+}

engine/libs/flecs/examples/c/systems/delta_time/src/main.c

@@ -0,0 +1,31 @@
+#include <delta_time.h>
+#include <stdio.h>
+
+void PrintDeltaTime(ecs_iter_t *it) {
+    // Print delta_time. The same value is passed to all systems.
+    printf("delta_time: %f\n", (double)it->delta_time);
+}
+
+int main(int argc, char *argv[]) {
+    ecs_world_t *ecs = ecs_init_w_args(argc, argv);
+
+    // Create system that prints delta_time. This system doesn't query for any
+    // components which means it won't match any entities, but will still be ran
+    // once for each call to ecs_progress.
+    ECS_SYSTEM(ecs, PrintDeltaTime, EcsOnUpdate, 0);
+
+    // Call progress with 0.0f for the delta_time parameter. This will cause
+    // ecs_progress to measure the time passed since the last frame. The
+    // delta_time of the first frame is a best guess (16ms).
+    ecs_progress(ecs, 0.0f);
+
+    // The following calls should print a delta_time of approximately 100ms
+
+    ecs_os_sleep(0, 100 * 1000 * 1000);
+    ecs_progress(ecs, 0.0f);
+
+    ecs_os_sleep(0, 100 * 1000 * 1000);
+    ecs_progress(ecs, 0.0f);
+
+    return ecs_fini(ecs);
+}