From 10288765588673645c1cc0a6e3d2245aff3f9080 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Tue, 1 Mar 2022 22:42:10 -0600
Subject: add basic window functions, option parsing, and main loop

---
 src/main.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 130 insertions(+), 2 deletions(-)

(limited to 'src/main.c')

diff --git a/src/main.c b/src/main.c
index 8111ef8..e6311c2 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,7 +1,135 @@
 #include <stdio.h>
+#include <honeysuckle.h>
 
-int main()
+#include "logging/logging.h"
+#include "options/honey_options.h"
+#include "gl/honey_gl.h"
+
+static int get_func(lua_State *L, char *name);
+static void loop(lua_State *L, int update, int draw);
+
+
+int main(int argc, char **argv)
 {
-   printf("hello, world!\n");
+   /* process command-line options */
+   struct honey_options options;
+   if (!parse_options(&options, argc, argv))
+      return 1;
+   if (options.display_help)
+      /* help displayed, exit */
+      return 0;
+
+   honey_info("options:\n"
+	      "  main script: %s\n"
+	      "  log level: %s\n",
+	      options.main_script,
+	      honey_log_level_str(options.log_level));
+
+   /* setup lua environment */
+   honey_debug("initialize lua_State\n");
+   lua_State *L = luaL_newstate();
+   luaL_openlibs(L);
+
+   honey_debug("load honey bindings\n");
+   lua_createtable(L, 0, 1);
+   int index = lua_gettop(L);
+
+   setup_window(L, index);
+
+   lua_setglobal(L, "honey");
+
+   /* load main script */
+   honey_debug("loading '%s'\n", options.main_script);
+
+   if (luaL_loadfile(L, options.main_script)) {
+      const char *error = lua_tostring(L, -1);
+      honey_fatal("%s\n", error);
+      return 1;
+   }
+
+   if (!hs_call(L, 0, 0)) {
+      const char *error = lua_tostring(L, -1);
+      honey_fatal("unhandled error: %s", error);
+      goto close; /* sorry */
+   }
+
+   if (!window.created) {
+      lua_getglobal(L, "honey");
+      lua_getfield(L, -1, "window");
+      lua_getfield(L, -1, "createWindow");
+      lua_pushinteger(L, 640);
+      lua_pushinteger(L, 480);
+      hs_call(L, 2, 0);
+   }
+
+   int update = get_func(L, "update");
+   if (update) honey_info("honey.update: %s\n", lua_tostring(L, update));
+   else honey_info("honey.update: (nil)\n");
+   int draw   = get_func(L, "draw");
+   if (draw) honey_info("honey.draw: %s\n", lua_tostring(L, draw));
+   else honey_info("honey.draw: (nil)\n");
+
+   while(!glfwWindowShouldClose(window.window))
+      loop(L, update, draw);
+
+ close:
+   lua_close(L);
+   glfwTerminate();
+   
    return 0;
 }
+
+
+static int get_func(lua_State *L, char *name)
+{
+   lua_getglobal(L, "honey");
+   int index = lua_gettop(L);
+   lua_getfield(L, -1, name);
+
+   if (lua_isfunction(L, -1)) {
+      lua_remove(L, index);
+      return lua_gettop(L);
+   }
+   else {
+      lua_pop(L, 2);
+      return 0;
+   }
+}
+			
+
+static void loop(lua_State *L, int update, int draw)
+{
+   static float prev_time = 0;
+   static float draw_time = 0;
+
+   float current_time = (float) glfwGetTime();
+   float dt = current_time - prev_time;
+   prev_time = current_time;
+
+   draw_time += dt;
+   glfwPollEvents();
+
+   if (update) {
+      lua_pushvalue(L, update);
+      lua_pushnumber(L, dt);
+      if (!hs_call(L, 1, 0)) {
+	 /* error! */
+	 const char *error = lua_tostring(L, -1);
+	 honey_fatal("unhandled error: %s\n", error);
+	 glfwSetWindowShouldClose(window.window, 1);
+      }
+   }
+
+   /* cap framerate at 60fps */
+   if (draw && draw_time > 0.016) {
+      draw_time -= 0.016;
+      lua_pushvalue(L, draw);
+      if(!hs_call(L, 0, 0)) {
+	 /* error! */
+	 const char *error = lua_tostring(L, -1);
+	 honey_fatal("unhandled error: %s\n", error);
+	 glfwSetWindowShouldClose(window.window, 1);
+      }
+   }
+}
+   
-- 
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