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#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include "glad.h"
#include <GLFW/glfw3.h>
#include <cglm/cglm.h>
#include <cglm/call.h>
#include "input.h"
struct options {
bool verbose;
bool run;
bool has_update;
bool has_draw;
char* scriptdir;
};
bool has_function(lua_State* L, char* field)
{
lua_getglobal(L, "honey");
lua_getfield(L, -1, field);
if (lua_isfunction(L, -1))
return true;
return false;
}
bool parse_options(struct options* opt, int argc, char** argv)
{
opt->verbose = false;
opt->run = false;
opterr = 0;
int c;
while ((c = getopt(argc, argv, "vh")) != -1) {
switch (c) {
case 'v':
opt->verbose = true;
break;
case 'h':
// print help
break;
case '?':
if (isprint (optopt))
fprintf (stderr, "Unknown option `-%c'.\n", optopt);
else
fprintf (stderr,
"Unknown option character `\\x%x'.\n",
optopt);
return false;
default:
return false;
}
}
if (optind < argc) {
opt->run = true;
opt->scriptdir = argv[optind];
}
return true;
}
GLFWwindow* setup_window(int width, int height, char* title)
{
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
GLFWwindow* window = glfwCreateWindow(width, height, title, NULL, NULL);
if (window == NULL) {
fprintf(stderr, "ERROR: failed to create window!\n");
glfwTerminate();
return NULL;
}
glfwMakeContextCurrent(window);
glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
if (!gladLoadGLLoader((GLADloadproc) glfwGetProcAddress)) {
fprintf(stderr, "ERROR: failed to initialize GLAD!\n");
glfwTerminate();
return NULL;
}
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
return window;
}
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
int main(int argc, char** argv)
{
struct options opt;
if (!parse_options(&opt, argc, argv)) {
fprintf(stderr, "ERROR: failed to parse command line options!\n");
return 1;
}
if (!opt.run)
return 0;
lua_State* L = luaL_newstate();
luaL_openlibs(L);
lua_createtable(L, 0, 1);
lua_createtable(L, 0, 1);
honey_setup_input(L);
lua_setfield(L, -2, "key");
lua_setfield(L, -2, "input");
lua_setglobal(L, "honey");
GLFWwindow* window = setup_window(480, 320, "honey-engine");
size_t dirlen = strlen(opt.scriptdir) + 10;
char* scriptfile = malloc(sizeof(char) * dirlen);
if (scriptfile == NULL) {
fprintf(stderr, "ERROR: failed to allocate memory for script file string!\n");
return 1;
}
snprintf(scriptfile, dirlen, "%s/main.lua", opt.scriptdir);
if (luaL_loadfile(L, scriptfile) == 0) {
if (lua_pcall(L, 0, 1, 0) == 0) {
lua_pop(L, lua_gettop(L));
}
}
else {
fprintf(stderr, "ERROR: failed to open %s!\n", scriptfile);
return 1;
}
opt.has_update = has_function(L, "update");
opt.has_draw = has_function(L, "draw");
float prevTime = 0;
float currentTime = 0;
float dt;
while (!glfwWindowShouldClose(window)) {
currentTime = (float) glfwGetTime();
dt = currentTime - prevTime;
prevTime = currentTime;
glfwPollEvents();
lua_getglobal(L, "honey");
if (opt.has_update) {
lua_getfield(L, -1, "update");
if (lua_isfunction(L, -1)) {
lua_pushnumber(L, dt);
int result = lua_pcall(L, 1, 0, 0);
if (result != 0) {
glfwSetWindowShouldClose(window, true);
}
}
else {
lua_pop(L, 1);
}
}
if (opt.has_draw) {
lua_getfield(L, -1, "draw");
if (lua_isfunction(L, -1)) {
int result = lua_pcall(L, 0, 0, 0);
if (result != 0) {
glfwSetWindowShouldClose(window, true);
}
}
else {
lua_pop(L, 1);
}
}
lua_pop(L, 1);
}
lua_close(L);
glfwTerminate();
return 0;
}
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