add basic window functions, option parsing, and main loop

2 files changed, 197 insertions, 11 deletions

diff --git a/src/gl/honey_gl.c b/src/gl/honey_gl.c
index bbb775f..6a113d1 100644
--- a/src/gl/honey_gl.c
+++ b/src/gl/honey_gl.c
@@ -1,10 +1,197 @@
 #include <honeysuckle.h>
+
+#include <stdbool.h>
+
 #include "logging/logging.h"
 #include "gl/honey_gl.h"
 
-int honey_gl_window_ref = LUA_NOREF;
 
-bool honey_gl_setup()
+struct honey_window window;
+
+static int resize_callback_ref = LUA_NOREF;
+static int resize_data_ref = LUA_NOREF;
+
+static int focus_callback_ref = LUA_NOREF;
+static int focus_data_ref = LUA_NOREF;
+
+static void error_callback(int code, const char *description);
+static void resize_callback(GLFWwindow *w, int width, int height);
+static void focus_callback(GLFWwindow *w, int focus);
+
+static int create_window(lua_State *L);
+
+static int window_get_size(lua_State *L);
+static int window_set_size(lua_State *L);
+static int window_set_resize_callback(lua_State *L);
+static int window_unset_resize_callback(lua_State *L);
+
+
+void setup_window(lua_State *L, int tbl_index)
 {
-   return false;
+   /* initialize window struct */
+   window.created = false;
+   window.L = L;
+   
+   /* set error handler */
+   glfwSetErrorCallback(error_callback);
+
+   /* create window table */
+   hs_create_table
+      (L,
+       hs_str_cfunc("createWindow", create_window),
+       hs_str_cfunc("getSize", window_get_size),
+       hs_str_cfunc("setSize", window_set_size),
+       hs_str_cfunc("setResizeCallback", window_set_resize_callback),
+       hs_str_cfunc("unsetResizeCallback", window_unset_resize_callback)
+       );
+
+   /* set honey table entry */
+   lua_setfield(L, tbl_index, "window");
+}
+
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * glfw callbacks
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+static void error_callback(int code, const char *description)
+{
+   honey_error("GLFW error %d: %s", code, description);
+   hs_throw_error(window.L, "(GLFW error %d) %s", code, description);
+}
+
+
+static void resize_callback(GLFWwindow *w, int width, int height)
+{
+   lua_State *L = window.L;
+
+   if (resize_callback_ref == LUA_NOREF)
+      /* no resize callback set */
+      return;
+
+   /* push callback function */
+   hs_rload(L, resize_callback_ref);
+
+   lua_pushinteger(L, width);
+   lua_pushinteger(L, height);
+
+   if (resize_data_ref == LUA_NOREF || resize_data_ref == LUA_REFNIL)
+      lua_pushnil(L);
+   else
+      hs_rload(L, resize_data_ref);
+
+   hs_call(L, 3, 0);
+}
+
+
+static void focus_callback(GLFWwindow *w, int focus)
+{
+   lua_State *L = window.L;
+
+   if (focus_callback_ref == LUA_NOREF)
+      /* no focus callback set */
+      return;
+
+   /* push callback function */
+   hs_rload(L, focus_callback_ref);
+
+   lua_pushboolean(L, focus);
+
+   if (focus_data_ref == LUA_NOREF || focus_data_ref == LUA_REFNIL)
+      lua_pushnil(L);
+   else
+      hs_rload(L, focus_data_ref);
+
+   hs_call(L, 2, 0);
+}
+
+
+/* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * window
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+static int create_window(lua_State *L)
+{
+   /* return immediately if already called */
+   if (window.created) return 0;
+   
+   lua_Integer x, y;
+   hs_parse_args(L, hs_int(x), hs_int(y));
+
+   if (!glfwInit()) {
+      /* window creation failed :c */
+      honey_fatal("failed to create window!");
+      hs_throw_error(L, "failed to create window!");
+   }
+
+   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+   glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+   window.window = glfwCreateWindow(x, y, "honey", NULL, NULL);
+   glfwMakeContextCurrent(window.window);
+
+   if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
+      honey_fatal("failed to initialize GLAD");
+      glfwTerminate();
+      hs_throw_error(L, "failed to initialize GLAD");
+   }
+
+   /* bind resize/focus callbacks */
+   glfwSetWindowSizeCallback(window.window, resize_callback);
+   glfwSetWindowFocusCallback(window.window, focus_callback);
+}
+
+
+static int window_get_size(lua_State *L)
+{
+   int width, height;
+   glfwGetWindowSize(window.window, &width, &height);
+   lua_pushinteger(L, width);
+   lua_pushinteger(L, height);
+   return 2;
+}
+
+
+static int window_set_size(lua_State *L)
+{
+   lua_Integer width, height;
+   hs_parse_args(L, hs_int(width), hs_int(height));
+   glfwSetWindowSize(window.window, width, height);
+   return 0;
+}
+
+
+static int window_set_resize_callback(lua_State *L)
+{
+   int cb, data;
+   hs_parse_args(L, hs_func(cb), hs_any(data));
+
+   lua_pushvalue(L, cb);
+   resize_callback_ref = hs_rstore(L);
+
+   lua_pushvalue(L, data);
+   resize_data_ref = hs_rstore(L);
+
+   return 0;
+}
+
+
+static int window_unset_resize_callback(lua_State *L)
+{
+   if (resize_callback_ref != LUA_NOREF)
+      hs_rdel(L, resize_callback_ref);
+   if (resize_data_ref != LUA_NOREF)
+      hs_rdel(L, resize_callback_ref);
+
+   resize_callback_ref = LUA_NOREF;
+   resize_data_ref = LUA_NOREF;
+
+   return 0;
 }
diff --git a/src/gl/honey_gl.h b/src/gl/honey_gl.h
index fc57037..8d5cdd9 100644
--- a/src/gl/honey_gl.h
+++ b/src/gl/honey_gl.h
@@ -1,18 +1,17 @@
 #ifndef HONEY_GL_H
 #define HONEY_GL_H
 
-#include <stdbool.h>
-
-#ifdef UNIT_TEST
-#include "test/mock/mock_GLFW.h"
-#else
 #include "glad/glad.h"
 #include <GLFW/glfw3.h>
-#endif
 
-extern int honey_gl_window_ref;
+struct honey_window {
+   GLFWwindow * window;
+   bool created;
+   lua_State *L;
+};
 
-bool honey_gl_setup();
+extern struct honey_window window;
 
+void setup_window(lua_State *L, int tbl_index);
 
 #endif