minor refactor for plugins

6 files changed, 81 insertions, 22 deletions

diff --git a/src/game-settings.cpp b/src/game-settings.cpp
index 54699dd..6f09432 100644
--- a/src/game-settings.cpp
+++ b/src/game-settings.cpp
@@ -1,4 +1,3 @@
 #include "game-settings.hpp"
 
 GameSettings pkeSettings{};
-PKEGameCallbacks pkeGameCallbacks{};
diff --git a/src/game-settings.hpp b/src/game-settings.hpp
index 480ae8e..3456725 100644
--- a/src/game-settings.hpp
+++ b/src/game-settings.hpp
@@ -33,15 +33,6 @@ struct GameSettings {
 	} mem;
 };
 
-struct PKEGameCallbacks {
-	void (*OnInit)() = nullptr;
-	void (*OnTick)(double delta) = nullptr;
-	void (*OnTeardown)() = nullptr;
-	void (*OnImGuiRender)() = nullptr;
-};
-
 extern GameSettings pkeSettings;
 
-extern PKEGameCallbacks pkeGameCallbacks;
-
 #endif /* PKE_GAME_SETTINGS_HPP */
diff --git a/src/game.cpp b/src/game.cpp
index 72228bf..5d39d1b 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -11,6 +11,7 @@
 #include "math-helpers.hpp"
 #include "physics.hpp"
 #include "player-input.hpp"
+#include "plugins.hpp"
 #include "vendor/glm_include.hpp"
 #include "window.hpp"
 
@@ -484,8 +485,8 @@ void Game_Tick(double delta) {
 	PkeInput_Tick(delta);
 
 	// TODO invoke external ticks here
-	if (pkeGameCallbacks.OnTick) {
-		pkeGameCallbacks.OnTick(delta);
+	if (pkePlugin.OnTick) {
+		pkePlugin.OnTick(delta);
 	}
 
 	EntityType_Tick_Late(delta);
@@ -502,8 +503,8 @@ void Game_Main(PKEWindowProperties windowProps) {
 		CreateWindow(windowProps);
 		PkeInput_Init();
 		EntityType_Init();
-		if (pkeGameCallbacks.OnInit) {
-			pkeGameCallbacks.OnInit();
+		if (pkePlugin.OnInit) {
+			pkePlugin.OnInit();
 		}
 
 		GameTimePoint lastTimePoint = pkeSettings.steadyClock.now();
@@ -593,8 +594,8 @@ void Game_Main(PKEWindowProperties windowProps) {
 #ifndef NDEBUG
 	Pke_DebugPrint();
 #endif
-	if (pkeGameCallbacks.OnTeardown) {
-		pkeGameCallbacks.OnTeardown();
+	if (pkePlugin.OnTeardown) {
+		pkePlugin.OnTeardown();
 	}
 	Game_Teardown();
 	Event_Teardown();
@@ -615,8 +616,8 @@ void Game_Init() {
 	for (long i = 0; i < consoleBufferCount; ++i) {
 		memset(consoleBuffer[i], '\0', consoleLineLength);
 	}
-	if (!pkeGameCallbacks.OnImGuiRender) {
-		pkeGameCallbacks.OnImGuiRender = Game_RecordImGui;
+	if (!pkePlugin.OnImGuiRender) {
+		pkePlugin.OnImGuiRender = Game_RecordImGui;
 	}
 }
 
diff --git a/src/plugins.cpp b/src/plugins.cpp
new file mode 100644
index 0000000..aa7efd5
--- /dev/null
+++ b/src/plugins.cpp
@@ -0,0 +1,51 @@
+
+#include "macros.hpp"
+#include "plugins.hpp"
+
+#include <cstdio>
+#include <dlfcn.h>
+
+PKEPluginInterface pkePlugin{};
+
+void *loadedPlugin = nullptr;
+
+void Pke_UpdatePlugin(const PKEPluginInterface &plugin) {
+	pkePlugin.OnInit = plugin.OnInit;
+	pkePlugin.OnTick = plugin.OnTick;
+	pkePlugin.OnTeardown = plugin.OnTeardown;
+	pkePlugin.OnImGuiRender = plugin.OnImGuiRender;
+}
+
+void Pke_LoadPlugin(const char *path) {
+	if (loadedPlugin != nullptr || loadedPlugin != CAFE_BABE(void)) {
+		return;
+	}
+	void *extension = dlopen(path, RTLD_NOW);
+	char *err = dlerror();
+	if (!extension) {
+		fprintf(stderr, "Given plugin library (%s) failed to load: %s\n", path, err);
+		return;
+	}
+	PKEPluginInterface *interface = reinterpret_cast<PKEPluginInterface *>(dlsym(extension, "pkePluginInterface"));
+	err = dlerror();
+	if (err != NULL) {
+		fprintf(stderr, "Given plugin library (%s) did not contain 'pkePluginInterface': %s\n", path, err);
+		dlclose(extension);
+		return;
+	}
+	Pke_UpdatePlugin(*interface);
+	loadedPlugin = interface;
+}
+
+void Pke_UnloadPlugin() {
+	pkePlugin = {
+		.OnInit = nullptr,
+		.OnTick= nullptr,
+		.OnTeardown= nullptr,
+		.OnImGuiRender= nullptr,
+	};
+	if (loadedPlugin != nullptr && loadedPlugin != CAFE_BABE(void)) {
+		dlclose(loadedPlugin);
+		loadedPlugin = CAFE_BABE(void);
+	}
+}
diff --git a/src/plugins.hpp b/src/plugins.hpp
new file mode 100644
index 0000000..2f34c12
--- /dev/null
+++ b/src/plugins.hpp
@@ -0,0 +1,16 @@
+#ifndef PKE_PLUGINS_HPP
+#define PKE_PLUGINS_HPP
+
+struct PKEPluginInterface {
+	void (*OnInit)() = nullptr;
+	void (*OnTick)(double delta) = nullptr;
+	void (*OnTeardown)() = nullptr;
+	void (*OnImGuiRender)() = nullptr;
+};
+
+extern PKEPluginInterface pkePlugin;
+
+void Pke_LoadPlugin(const char *path);
+void Pke_UnloadPlugin();
+
+#endif /* PKE_PLUGINS_HPP */
diff --git a/src/window.cpp b/src/window.cpp
index 8d40221..f9b6ff2 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -1,6 +1,8 @@
 #define GLFW_INCLUDE_NONE
 #define GLFW_INCLUDE_VULKAN
 
+#include "window.hpp"
+
 #include "asset-manager.hpp"
 #include "camera.hpp"
 #include "ecs.hpp"
@@ -9,8 +11,8 @@
 #include "game-settings.hpp"
 #include "helpers.hpp"
 #include "memory.hpp"
+#include "plugins.hpp"
 #include "static/cube.hpp"
-#include "window.hpp"
 #include "window-types.hpp"
 
 #include "glm/ext/matrix_transform.hpp"
@@ -111,7 +113,6 @@ ImplementedPipelines pkePipelines{};
 /*
  * ImGui
  */
-bool isImGuiRenderActive = true;
 VkDescriptorPool imGuiDescriptorPool;
 
 const std::vector<const char *> REQUIRED_EXTENSIONS = std::vector<const char *> {
@@ -2427,12 +2428,12 @@ void RecordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
 	vkCmdDraw(commandBuffer, 3, 1, 0, 0);
 
 	// ImGui
-	if (isImGuiRenderActive && pkeGameCallbacks.OnImGuiRender) {
+	if (pkePlugin.OnImGuiRender) {
 		ImGui_ImplVulkan_NewFrame();
 		ImGui_ImplGlfw_NewFrame();
 		ImGui::NewFrame();
 
-		pkeGameCallbacks.OnImGuiRender();
+		pkePlugin.OnImGuiRender();
 
 		ImGui::Render();
 		auto drawData = ImGui::GetDrawData();