feat: Launcher application that loads the game and creates the window

meson.build

@@ -74,10 +74,10 @@ m_dep = compiler.find_library('m', required : false)
 meshoptimizer_proj = subproject('meshoptimizer', default_options: ['warning_level=0', 'werror=false'] )
 meshoptimizer_dep = meshoptimizer_proj.get_variable('meshoptimizer_dep')
 
-windowing_dep = []
+if host_machine.system() == 'linux' and get_option('use_xlib')
-if get_option('use_xlib')
-  windowing_dep = dependency('x11', required : true)
   add_project_arguments(['-DRT_USE_XLIB'], language : ['c', 'cpp'])
+elif host_machine.system() == 'linux' and get_option('use_wayland')
+  add_project_arguments(['-DRT_USE_WAYLAND'], language: ['c', 'cpp'])
 endif
 
 # Copy file utility
@@ -98,16 +98,16 @@ subdir('src')
 engine_link_libs = []
 if get_option('default_library') == 'static'
   if get_option('static_renderer') == 'vk'
-    engine_link_libs = [runtime_lib, app_lib, vk_renderer_lib]
+    engine_link_libs = [runtime_lib, vk_renderer_lib]
   elif get_option('static_renderer') == 'null'
-    engine_link_libs = [runtime_lib, app_lib, null_renderer_lib]
+    engine_link_libs = [runtime_lib, null_renderer_lib]
   elif get_option('static_renderer') == 'dx11'
-    engine_link_libs = [runtime_lib, app_lib, dx11_renderer_lib]
+    engine_link_libs = [runtime_lib, dx11_renderer_lib]
   else
     error('Invalid static_renderer option ', get_option('static_renderer'))
   endif
 else
-  engine_link_libs = [runtime_lib, gfx_lib, app_lib]
+  engine_link_libs = [runtime_lib]
 endif
 
 # Unit/Integration test driver

meson_options.txt

@@ -1,5 +1,6 @@
 option('static_renderer', type : 'string', value : 'dx11', description : 'Name of the renderer used for static builds')
-option('use_xlib', type : 'boolean', value : false, description : 'Use Xlib for window creation under linux')
+option('use_xlib', type : 'boolean', value : true, description : 'Use Xlib for window creation under linux')
+option('use_wayland', type : 'boolean', value : false, description : 'Use wayland for window creation under linux')
 option('error_report_debugbreak', type : 'boolean', value : true, description : 'Debugbreak in ReportError')
 option('enable_dxc_shader_compiler', type : 'boolean', value : true, description : 'Enables building the dxc-based shader compiler.')
 option('enable_dx11_shader_compiler', type : 'boolean', value : true, description : 'Enables building the dx11-bases shader compiler.')
@@ -7,3 +8,4 @@ option('game_as_subdir', type : 'boolean', value : false, description : 'If true
 option('build_dx11', type : 'boolean', value : true, description : 'Enables/disables the build of the dx11 renderer.')
 option('build_vk', type : 'boolean', value : true, description : 'Enables/disables the build of the vulkan renderer.')
 option('build_experiments', type : 'boolean', value : false, description : 'Enables/disables building the experiments in src/experimental.')
+option('launcher_name', type : 'string', value : 'launcher', description : 'Name of the launcher executable.', yield : true)

src/launcher/game_api.h

@@ -0,0 +1,25 @@
+#ifndef RT_LAUNCHER_GAME_API_H
+#define RT_LAUNCHER_GAME_API_H
+
+#include <runtime/runtime.h>
+
+typedef void rt_game_register_cvars_fn(void);
+typedef rt_result rt_game_initialize_fn(void);
+typedef void rt_game_shutdown(void);
+
+typedef struct {
+    rt_game_register_cvars_fn *RegisterCVARs;
+    rt_game_initialize_fn *Init;
+    rt_game_shutdown *Shutdown;
+} rt_game_api;
+
+
+typedef rt_game_api rt_load_game_api_fn(void);
+
+#ifdef __cplusplus
+#define LOAD_GAME_API_FUNC extern "C" RT_DLLEXPORT rt_game_api rtLoadGameAPI()
+#else
+#define LOAD_GAME_API_FUNC RT_DLLEXPORT rt_game_api rtLoadGameAPI()
+#endif
+
+#endif

src/launcher/launcher.c

@@ -0,0 +1,253 @@
+#include "runtime/aio.h"
+#include "runtime/file_tab.h"
+#include "runtime/mem_arena.h"
+
+#ifdef __WIN32
+#define GLFW_EXPOSE_NATIVE_WIN32
+#elif defined(RT_USE_XLIB)
+#define GLFW_EXPOSE_NATIVE_X11
+#elif defined(RT_USE_WAYLAND)
+#define GLFW_EXPOSE_NATIVE_WAYLAND
+#endif
+#define GLFW_INCLUDE_NONE
+#include <GLFW/glfw3.h>
+#include <GLFW/glfw3native.h>
+
+#include <runtime/runtime.h>
+#include <runtime/config.h>
+#include <runtime/dynamic_libs.h>
+#include <renderer/common/renderer_api.h>
+#include <string.h>
+ 
+#include "game_api.h"
+
+RT_CVAR_S(rt_Renderer, "The used renderer. Available options: vk, dx11. (Default: vk)", "vk");
+RT_CVAR_S(rt_WindowTitle, "The title used for the game window. (Default: rtengine)", "rtengine");
+RT_CVAR_I(rt_WindowWidth, "The window width. (Default: 1024)", 1024);
+RT_CVAR_I(rt_WindowHeight, "The window height. (Default: 768)", 768);
+RT_CVAR_I(rt_WindowMode, "The window mode. Available options: 0 (=Windowed), 1 (=Borderless Fullscreen), 2 (=Exclusive Fullscreen) (Default: 0)", 0);
+RT_CVAR_I(rt_FullscreenRefreshRate, "Requested refresh rate for exclusive fullscreen. Set to 0 to use the monitors current setting. (Default: 0)", 0);
+
+RT_CVAR_S(rt_GameLib, "Path to the game library. Only usable in internal builds. (Default: "")", "");
+
+enum {
+  WINDOW_MODE_WINDOWED,
+  WINDOW_MODE_BORDERLESS_FULLSCREEN,
+  WINDOW_MODE_FULLSCREEN,
+};
+
+/* This is baked in during compilation to make tampering with it harder.
+ * In debug (internal) builds, this can be overwritten via cvar or command line argument. */
+#ifndef RT_GAME_LIB_PATH
+#define RT_GAME_LIB_PATH "(null)"
+#endif
+
+static rt_dynlib *_game_lib = NULL;
+
+#ifdef _WIN32
+static HINSTANCE _hInstance;
+#endif
+
+static void SetupConfig(void) {
+    rtRegisterCVAR(&rt_Renderer);
+    rtRegisterCVAR(&rt_WindowTitle);
+    rtRegisterCVAR(&rt_WindowWidth);
+    rtRegisterCVAR(&rt_WindowHeight);
+    rtRegisterCVAR(&rt_WindowMode);
+
+    rtRegisterCVAR(&rt_GameLib);
+
+    rt_file_id config_fid = rtAddFile("cfg/launcher.cfg");
+    if (rtProcessConfigFiles(1, &config_fid) != RT_SUCCESS) {
+        rtLog("LAUNCHER", "Processing launcher configs failed.");
+    }
+}
+
+static void LoadGameAndRendererConfig() {
+    rt_file_id renderer_cfg_fid = rtAddFile("cfg/renderer.cfg");
+    rt_file_id game_cfg_fid = rtAddFile("cfg/game.cfg");
+    rt_file_id fids[2] = { renderer_cfg_fid, game_cfg_fid };
+
+    rtProcessConfigFiles(RT_ARRAY_COUNT(fids), fids);
+}
+
+static void __NullGame_RegisterCVARs(void) {}
+static rt_result __NullGame_Init(void) { return RT_SUCCESS; }
+static void __NullGame_Shutdown(void) {}
+
+
+static rt_game_api LoadGame(const char *cmdline_gamelib) {
+    const char *game_lib = RT_GAME_LIB_PATH;
+#ifdef RT_DEBUG
+    if (strlen(rt_GameLib.s) > 0) {
+        game_lib = rt_GameLib.s;
+    }
+    if (cmdline_gamelib && strlen(cmdline_gamelib) > 0) {
+        game_lib = cmdline_gamelib;
+    }
+#endif
+
+    if (strcmp(game_lib, "(null)") != 0) {
+        _game_lib = rtOpenLib(game_lib);
+        if (!_game_lib) {
+            rtReportError("LAUNCHER", "Failed to open game library: %s", game_lib);
+            goto out;
+        }
+        rt_load_game_api_fn *LoadGameAPI = rtGetSymbol(_game_lib, "rtLoadGameAPI");
+        if (!LoadGameAPI) {
+            rtReportError("LAUNCHER", "%s is not a valid game library (rtLoadGameAPI symbol is missing).", game_lib);
+            rtCloseLib(_game_lib);
+            _game_lib = NULL;
+            goto out;
+        }
+        return LoadGameAPI();
+    }
+
+out:
+    /* Fall back to null implementation. */
+    return (rt_game_api){
+        .RegisterCVARs = __NullGame_RegisterCVARs,
+        .Init          = __NullGame_Init,
+        .Shutdown      = __NullGame_Shutdown,
+    };
+}
+
+static void GlfwErrorCB(int err, const char *desc) {
+    rtReportError("GLFW", "GLFW Error %d: %s", err, desc);
+}
+
+static int Entry(int argc, char **argv) {
+    if (rtInitRuntime() != RT_SUCCESS)
+        return -1;
+    SetupConfig();
+
+    glfwSetErrorCallback(GlfwErrorCB);
+    if (!glfwInit()) {
+        rtShutdownRuntime();
+        return -1;
+    }
+
+    /* Load the renderer library.
+     * We need it before window creation, to give it an opportunity to register its cvars */
+    if (rtLoadRenderer() != RT_SUCCESS) {
+        rtShutdownRuntime();
+        glfwTerminate();
+        return -1;
+    }
+    g_renderer.RegisterCVARs();
+
+    /* Load the game */
+    const char *game_lib_cmdline = NULL;
+#ifdef RT_DEBUG
+    for (int i = 1; i < argc - 1; ++i) {
+        if (strcmp(argv[i], "--game") == 0) {
+            game_lib_cmdline = argv[i + 1];
+            break;
+        }
+    }
+#endif
+    rt_game_api game = LoadGame(game_lib_cmdline);
+    game.RegisterCVARs();
+
+    LoadGameAndRendererConfig();
+
+    /* Create the window */
+    GLFWwindow *window = NULL;
+    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+    glfwWindowHint(GLFW_FOCUSED, GLFW_TRUE);
+    glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
+    glfwWindowHint(GLFW_CENTER_CURSOR, GLFW_TRUE);
+    
+    if (rt_WindowMode.i == WINDOW_MODE_BORDERLESS_FULLSCREEN) {
+        const GLFWvidmode *mode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+        glfwWindowHint(GLFW_RED_BITS, mode->redBits);
+        glfwWindowHint(GLFW_GREEN_BITS, mode->greenBits);
+        glfwWindowHint(GLFW_BLUE_BITS, mode->blueBits);
+        glfwWindowHint(GLFW_REFRESH_RATE, mode->refreshRate);
+        window = glfwCreateWindow(mode->width, mode->height, rt_WindowTitle.s, glfwGetPrimaryMonitor(), NULL);
+    }
+    else if (rt_WindowMode.i == WINDOW_MODE_FULLSCREEN) {
+        int refresh_rate = rt_FullscreenRefreshRate.i;
+        if (refresh_rate == 0) {
+            refresh_rate = glfwGetVideoMode(glfwGetPrimaryMonitor())->refreshRate;
+        }
+        else {
+            int count;
+            glfwGetVideoModes(NULL, &count);
+            rt_temp_arena temp = rtGetTemporaryArena(NULL, 0);
+            GLFWvidmode *modes = RT_ARENA_PUSH_ARRAY(temp.arena, GLFWvidmode, count);
+            int is_supported = 0;
+            for (int i = 0; i < count; ++i) {
+                if (modes[i].refreshRate == refresh_rate) {
+                    is_supported = 1;
+                    break;
+                }
+            }
+            rtReturnTemporaryArena(temp);
+            if (!is_supported) {
+                rtLog("LAUNCHER", "Requested refresh rate %d Hz is not supported. Using current setting instead.", refresh_rate);
+                refresh_rate = glfwGetVideoMode(glfwGetPrimaryMonitor())->refreshRate;
+            }
+        }
+        glfwWindowHint(GLFW_REFRESH_RATE, refresh_rate);
+        window = glfwCreateWindow(rt_WindowWidth.i, rt_WindowHeight.i, rt_WindowTitle.s, glfwGetPrimaryMonitor(), NULL);
+    }
+    else {
+        window = glfwCreateWindow(rt_WindowWidth.i, rt_WindowHeight.i, rt_WindowTitle.s, NULL, NULL);
+    }
+
+    if (!window) {
+        rtReportError("LAUNCHER", "Failed to create the game window.");
+        if (_game_lib)
+            rtCloseLib(_game_lib);
+        glfwTerminate();
+        rtShutdownRuntime();
+        return -1;
+    }
+
+    /* Initialize the renderer */
+    rt_renderer_init_info renderer_init_info;
+#ifdef _WIN32
+    renderer_init_info.hWnd = glfwGetWin32Window(window);
+    renderer_init_info.hInstance = _hInstance;
+#elif defined(__linux__) && defined(RT_USE_XLIB)
+    renderer_init_info.display = glfwGetX11Display();
+    renderer_init_info.window = glfwGetX11Window(window);
+#endif
+    renderer_init_info.is_fullscreen = rt_WindowMode.i != WINDOW_MODE_WINDOWED;
+    glfwGetFramebufferSize(window, (int*)&renderer_init_info.width, (int*)&renderer_init_info.height);
+    if (g_renderer.Init(&renderer_init_info) != RT_SUCCESS) {
+        
+    }
+
+    if (game.Init() != RT_SUCCESS) {
+        
+    }
+
+    while (!glfwWindowShouldClose(window)) {
+        glfwPollEvents();
+    }
+
+    game.Shutdown();
+    g_renderer.Shutdown();
+
+    glfwDestroyWindow(window);
+    glfwTerminate();
+    if (_game_lib)
+        rtCloseLib(_game_lib);
+    rtShutdownRuntime();
+    
+    return 0;
+}
+
+#ifdef _WIN32
+#define WIN32_LEAN_AND_MEAN
+int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCVE hPrevInstance, PWSTR pCmdLine, int nCmdShow) {
+    _hInstance = hInstance;
+    return 0;
+}
+#else
+int main(int argc, char **argv) {
+    return Entry(argc, argv);
+}
+#endif

src/launcher/meson.build

@@ -0,0 +1,28 @@
+launcher_deps = [thread_dep, m_dep]
+
+glfw_proj = subproject('glfw', default_options: ['default_library=static', 'warning_level=0', 'werror=false'])
+glfw_dep = glfw_proj.get_variable('glfw_dep')
+
+launcher_deps += glfw_dep
+launcher_link_libs = [runtime_lib]
+
+if get_option('default_library') == 'static'
+  if get_option('static_renderer') == 'vk'
+    launcher_link_libs += vk_renderer_lib
+  elif get_option('static_renderer') == 'dx11'
+    launcher_link_libs += dx11_renderer_lib
+  else
+    error('Invalid static_renderer option ', get_option('static_renderer'))
+  endif
+endif
+
+launcher_name = get_option('launcher_name')
+
+executable(launcher_name,
+  'launcher.c',
+  '../renderer/common/load_stub.c',
+  include_directories: engine_incdir,
+  dependencies: launcher_deps,
+  link_with: launcher_link_libs,
+  win_subsystem: 'windows')
+

src/meson.build

@@ -1,11 +1,12 @@
 subdir('runtime')
 subdir('asset_compiler')
-subdir('app_framework')
 
 subdir('renderer/common')
 subdir('renderer/dx11')
 subdir('renderer/vk')
 
+subdir('launcher')
+
 if get_option('build_experiments')
   subdir('experimental')
 endif

src/renderer/common/load_stub.c

@@ -1,10 +1,10 @@
 #include "renderer_api.h"
 #include "runtime/dynamic_libs.h"
 #include "runtime/config.h"
+#include "runtime/runtime.h"
 
 #include <string.h>
 
-static RT_CVAR_S(rt_Renderer, "The used renderer. Available options: dx11.", "dx11");
 
 RT_DLLEXPORT rt_renderer_api g_renderer;
 
@@ -16,16 +16,28 @@ extern rt_renderer_api rtLoadRendererImpl(void);
 static rt_dynlib _renderer_lib;
 #endif
 
+#define DEFAULT_RENDERER "vk"
+
 RT_DLLEXPORT rt_result rtLoadRenderer(void) {
     rt_load_renderer_impl_fn *LoadRendererImpl = NULL;
-    if (!rtGetCVAR("rt_Renderer"))
+    rt_cvar *rt_Renderer = rtGetCVAR("rt_Renderer");
-        rtRegisterCVAR(&rt_Renderer);
+    const char *renderer = DEFAULT_RENDERER;
+    if (!rt_Renderer) {
+        rtReportError("RENDERER", "rt_Renderer CVAR is not registered. Falling back to '%s'.", DEFAULT_RENDERER);
+    }
+    else {
+        renderer = rt_Renderer->s;
+    }
+    
 #ifdef RT_STATIC_LIB
+    RT_UNUSED((void*)renderer);
     LoadRendererImpl = rtLoadRendererImpl;
 #else
     const char *dllname = NULL;
-    if (strcmp(rt_Renderer.s, "dx11")==0)
+    if (strcmp(renderer, "dx11")==0)
         dllname = RT_DLLNAME("rtdx11");
+    else if (strcmp(renderer, "vk") == 0)
+        dllname = RTODLLNAME("rtvk");
     else {
         rtReportError("RENDERER", "Invalid renderer selected: %s", rt_Renderer.s);
         return RT_INVALID_VALUE;

src/renderer/common/renderer_api.h

@@ -27,6 +27,7 @@ typedef struct {
     int is_fullscreen;
 } rt_renderer_init_info;
 
+typedef void rt_renderer_register_cvars_fn(void);
 typedef rt_result rt_renderer_init_fn(const rt_renderer_init_info *info);
 typedef void rt_renderer_shutdown_fn(void);
 
@@ -39,6 +40,7 @@ typedef enum {
 
 /* Public renderer interface */
 typedef struct {
+    rt_renderer_register_cvars_fn *RegisterCVARs;
     rt_renderer_init_fn *Init;
     rt_renderer_shutdown_fn *Shutdown;
 } rt_renderer_api;
@@ -47,6 +49,8 @@ typedef struct {
 /* Global renderer object */
 RT_DLLIMPORT extern rt_renderer_api g_renderer;
 
+/* This function is declared here, but it's definition is not necessarily compiled,
+ * where you think it is. Normally, you will not have to call this. */
 RT_DLLEXPORT rt_result rtLoadRenderer(void);
 
 #endif

src/renderer/dx11/init.cpp

@@ -3,6 +3,9 @@
 
 #include "device.hpp"
 
+void Dx11RegisterCVARs(void) {
+}
+
 rt_result Dx11Init(const rt_renderer_init_info *info) {
     rt_result res = rt_dx11_device::GetInstance()->Initialize(info);
     if (res != RT_SUCCESS)
@@ -20,8 +23,9 @@ void Dx11Shutdown(void) {
 // Called by the application to retrieve the renderer api
 extern "C" RT_DLLEXPORT rt_renderer_api rtLoadRendererImpl(void) {
     rt_renderer_api api = {
-        .Init     = Dx11Init,
+        .RegisterCVARs = Dx11RegisterCVARs,
-        .Shutdown = Dx11Shutdown,
+        .Init          = Dx11Init,
+        .Shutdown      = Dx11Shutdown,
     };
     return api;
 }

src/renderer/vk/init.c

@@ -1,5 +1,9 @@
 #include "renderer/common/renderer_api.h"
 
+void VkRegisterCVARs(void) {
+    
+}
+
 rt_result VkInit(const rt_renderer_init_info *info) {
     return RT_SUCCESS;
 }
@@ -10,8 +14,9 @@ void VkShutdown(void) {
 // Called by the application to retrieve the renderer api
 RT_DLLEXPORT rt_renderer_api rtLoadRendererImpl(void) {
     rt_renderer_api api = {
-        .Init     = VkInit,
+        .RegisterCVARs = VkRegisterCVARs,
-        .Shutdown = VkShutdown,
+        .Init          = VkInit,
+        .Shutdown      = VkShutdown,
     };
     return api;
 }

src/runtime/config.c

@@ -251,6 +251,8 @@ RT_DLLEXPORT rt_result rtProcessConfigFiles(unsigned int count, const rt_file_id
     }
 
     for (unsigned int i = 0; i < count; ++i) {
+        if (aios[i] == RT_AIO_INVALID_HANDLE)
+            continue;
         rt_aio_state state = rtWaitForAIOCompletion(aios[i]);
         if (state == RT_AIO_STATE_FINISHED) {
             res = ProcessConfigFile(configs[i].buffer, configs[i].fsz, configs[i].path);

src/runtime/init.c

@@ -83,4 +83,4 @@ RT_DLLEXPORT void rtShutdownRuntime(void) {
     ShutdownAIO();
     ShutdownFileTab();
     ShutdownBufferManager();
-}
+}

src/runtime/meson.build

@@ -6,7 +6,7 @@ lz4_dep = lz4_proj.get_variable('liblz4_dep')
 xxhash_proj = subproject('xxhash', default_options: ['default_library=static', 'b_sanitize=none'])
 xxhash_dep = xxhash_proj.get_variable('xxhash_dep')
 
-runtime_deps = [thread_dep, m_dep, windowing_dep, inih_dep, lz4_dep, xxhash_dep]
+runtime_deps = [thread_dep, m_dep, inih_dep, lz4_dep, xxhash_dep]
 runtime_incdirs = contrib_incdir
 runtime_lib = library('rt',
   # Project Sources