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/*
* Main game module with entry point and game loop.
*
* The game module sets up the window and GL context and defers the core game
* logic to a plugin.
*/
#define _GNU_SOURCE 200112L // For readlink()
#include "game.h"
#include "plugins/plugin.h"
#include <gfx/gfx.h>
#include <gfx/gfx_app.h>
#include <gfx/render_backend.h>
#include <gfx/renderer.h>
#include <gfx/scene/camera.h>
#include <gfx/scene/node.h>
#include <gfx/scene/object.h>
#include <gfx/scene/scene.h>
#include <error.h>
#include <log/log.h>
#include <math/camera.h>
#include <plugin.h>
#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <linux/limits.h>
#include <unistd.h>
#undef _GNU_SOURCE
static const int WIDTH = 1350;
static const int HEIGHT = 900;
static const int MAX_FPS = 60;
/// Initialize the game's plugin.
static bool init_plugin(Game* game) {
assert(game);
assert(game->plugin);
// Plugin state is allowed to be null, either when the plugin does not
// expose an init() or when init() does not initialize a state.
if (plugin_resolve(game->plugin, plugin_init, "init")) {
State* plugin_state = 0;
if (!plugin_call(game->plugin, plugin_init, "init", game, &plugin_state)) {
return false;
}
set_plugin_state(game->plugin, plugin_state);
}
return true; // Plugin does not need to expose an init().
}
/// Shutdown the game's plugin.
/// The game's plugin is allowed to be null in the call to this function.
static void shutdown_plugin(Game* game) {
assert(game);
if (game->plugin &&
(plugin_resolve(game->plugin, plugin_shutdown, "shutdown"))) {
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(game->plugin, plugin_shutdown, "shutdown", game, plugin_state);
set_plugin_state(game->plugin, 0);
}
}
/// Boot the game's plugin.
static bool boot_plugin(Game* game) {
assert(game);
assert(game->plugin);
if (plugin_resolve(game->plugin, plugin_boot, "boot")) {
void* plugin_state = get_plugin_state(game->plugin);
return plugin_call(game->plugin, plugin_boot, "boot", game, plugin_state);
}
return true; // Plugin does not need to expose a boot().
}
/// Update the plugin's state.
static void update_plugin(Game* game, double t, double dt) {
assert(game);
assert(game->plugin);
if (plugin_resolve(game->plugin, plugin_update, "update")) {
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(
game->plugin, plugin_update, "update", game, plugin_state, t, dt);
}
}
/// Plugin render.
static void render_plugin(const Game* game) {
assert(game);
assert(game->plugin);
if (plugin_resolve(game->plugin, plugin_render, "render")) {
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(game->plugin, plugin_render, "render", game, plugin_state);
}
}
/// Plugin resize.
static void resize_plugin(Game* game, int width, int height) {
assert(game);
assert(game->plugin);
if (plugin_resolve(game->plugin, plugin_resize, "resize")) {
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(
game->plugin, plugin_resize, "resize", game, plugin_state, width,
height);
}
}
void app_end(Game* game);
bool app_init(const GfxAppDesc* desc, void** app_state) {
assert(desc);
if (desc->argc <= 1) {
LOGE("Usage: %s <plugin> [plugin args]", desc->argv[0]);
return false;
}
Game* game = calloc(1, sizeof(Game));
if (!game) {
LOGE("Failed to allocate game state");
return false;
}
// Syntax: game <plugin> [plugin args]
//
// Here we consume the <plugin> arg so that plugins receive the remainder
// args starting from 0.
game->argc = desc->argc - 1;
game->argv = desc->argv + 1;
char exe_path_buf[NAME_MAX] = {0};
if (readlink("/proc/self/exe", exe_path_buf, sizeof(exe_path_buf)) == -1) {
LOGE("readlink(/proc/self/exe) failed");
goto cleanup;
}
// Replace the last / with a null terminator to remove the exe file from the
// path. This gets the file's parent directory.
*strrchr(exe_path_buf, '/') = 0;
const mstring exe_dir = mstring_make(exe_path_buf);
const mstring plugins_path = mstring_concat_cstr(exe_dir, "/src/plugins");
if (!(game->plugin_engine = new_plugin_engine(
&(PluginEngineDesc){.plugins_dir = mstring_cstr(&plugins_path)}))) {
goto cleanup;
}
const char* plugin = desc->argv[1];
if (!(game->plugin = load_plugin(game->plugin_engine, plugin))) {
goto cleanup;
}
if (!(game->gfx = gfx_init())) {
goto cleanup;
}
if (!init_plugin(game)) {
goto cleanup;
}
if (!boot_plugin(game)) {
goto cleanup;
}
*app_state = game;
return true;
cleanup:
LOGE("Gfx error: %s", get_error());
app_end(game);
return false;
}
void app_end(Game* game) {
assert(game);
shutdown_plugin(game);
if (game->gfx) {
gfx_destroy(&game->gfx);
}
if (game->plugin) {
delete_plugin(&game->plugin);
}
if (game->plugin_engine) {
delete_plugin_engine(&game->plugin_engine);
}
}
void app_update(Game* game, double t, double dt) {
plugin_engine_update(game->plugin_engine);
if (plugin_reloaded(game->plugin)) {
shutdown_plugin(game);
const bool result = init_plugin(game);
assert(result); // TODO: handle error better.
// Trigger a resize just like the initial resize that occurs when the gfx
// application starts.
resize_plugin(game, game->width, game->height);
}
update_plugin(game, t, dt);
}
void app_render(const Game* game) {
RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
gfx_start_frame(render_backend);
render_plugin(game);
gfx_end_frame(render_backend);
}
void app_resize(Game* game, int width, int height) {
game->width = width;
game->height = height;
RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
gfx_set_viewport(render_backend, width, height);
resize_plugin(game, width, height);
}
GFX_APP_MAIN(WIDTH, HEIGHT, MAX_FPS);
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