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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/render_backend.h>
#include <gfx/scene/camera.h>
#include <gfx/scene/object.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 <linux/limits.h>
#include <unistd.h>
#undef _GNU_SOURCE
// Plugin to load if no plugin is provided.
static const char* DEFAULT_PLUGIN = "texture_view";
bool game_new(Game* game, int argc, const char** argv) {
assert(game);
// Syntax: game [plugin] <plugin args>
//
// Here we consume the [plugin] arg so that plugins receive the remainder
// args starting from 0.
game->argc = argc - 1;
game->argv = 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 = argc > 1 ? argv[1] : DEFAULT_PLUGIN;
if (!(game->plugin = load_plugin(game->plugin_engine, plugin))) {
goto cleanup;
}
if (!(game->gfx = gfx_init())) {
goto cleanup;
}
if (!(game->scene = gfx_make_scene())) {
goto cleanup;
}
if (!(game->camera = gfx_make_camera())) {
goto cleanup;
}
if (plugin_resolve(game->plugin, plugin_init, "init")) {
void* plugin_state = plugin_call(game->plugin, plugin_init, "init", game);
if (!plugin_state) {
goto cleanup;
}
set_plugin_state(game->plugin, plugin_state);
}
if (plugin_resolve(game->plugin, plugin_boot, "boot")) {
void* plugin_state = get_plugin_state(game->plugin);
bool boot_success =
plugin_call(game->plugin, plugin_boot, "boot", plugin_state, game);
if (!boot_success) {
goto cleanup;
}
}
return true;
cleanup:
LOGE("Gfx error: %s", get_error());
game_end(game);
return false;
}
void game_end(Game* game) {
assert(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 game_update(Game* game, double t, double dt) {
plugin_engine_update(game->plugin_engine);
if (plugin_reloaded(game->plugin) &&
plugin_resolve(game->plugin, plugin_init, "init")) {
void* plugin_state = plugin_call(game->plugin, plugin_init, "init", game);
assert(plugin_state); // TODO: handle error better.
set_plugin_state(game->plugin, plugin_state);
}
if (plugin_resolve(game->plugin, plugin_update, "update")) {
// Plugin state may be null if plugin does not expose init().
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(
game->plugin, plugin_update, "update", plugin_state, game, t, dt);
}
}
void game_render(const Game* game) {
RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
Renderer* renderer = gfx_get_renderer(game->gfx);
gfx_start_frame(render_backend);
gfx_render_scene(
renderer,
&(RenderSceneParams){
.mode = RenderDefault, .scene = game->scene, .camera = game->camera});
if (plugin_resolve(game->plugin, plugin_render, "render")) {
// Plugin state may be null if plugin does not expose init().
void* plugin_state = get_plugin_state(game->plugin);
plugin_call(game->plugin, plugin_render, "render", plugin_state, game);
}
gfx_end_frame(render_backend);
}
void game_set_viewport(Game* game, int width, int height) {
RenderBackend* render_backend = gfx_get_render_backend(game->gfx);
gfx_set_viewport(render_backend, width, height);
const R fovy = 90 * TO_RAD;
const R aspect = (R)width / (R)height;
const R near = 0.1;
const R far = 1000;
const mat4 projection = mat4_perspective(fovy, aspect, near, far);
Camera* camera = gfx_get_camera_camera(game->camera);
camera->projection = projection;
}
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