Properly link flecs library

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

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

engine/libs/flecs/examples/c/systems/target_fps/include/target_fps/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 TARGET_FPS_BAKE_CONFIG_H
+#define TARGET_FPS_BAKE_CONFIG_H
+
+/* Headers of public dependencies */
+#include <flecs.h>
+
+#endif
+

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

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

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

@@ -0,0 +1,37 @@
+#include <target_fps.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);
+
+    // Set target FPS to 1 frame per second
+    ecs_set_target_fps(ecs, 1);
+
+    // Run 5 frames
+    for (int i = 0; i < 5; i ++) {
+        // To make sure the frame doesn't run faster than the specified target
+        // FPS ecs_progress will insert a sleep if the measured delta_time is
+        // smaller than 1 / target_fps.
+        //
+        // By default ecs_progress uses the sleep function provided by the OS
+        // which is not always very accurate. If more accuracy is required the
+        // sleep function of the OS API can be overridden with a custom one.
+        //
+        // If a value other than 0 is provided to the delta_time argument of
+        // ecs_progress, this value will be used to calculate the length of
+        // the sleep to insert.
+        ecs_progress(ecs, 0);
+    }
+
+    return ecs_fini(ecs);
+}