Bolt/src/library/plugin/plugin_api.c

#include "../ipc.h"
#include "plugin_api.h"
#include "lua.h"
#include "plugin.h"

#include "../../../modules/hashmap/hashmap.h"
#include "../../../modules/spng/spng/spng.h"

#include <lauxlib.h>
#include <math.h>
#include <string.h>
#include <time.h>

#if defined(_WIN32)
#define getpid _getpid
#else
#include <limits.h>
#include <unistd.h>
#endif

#define API_VERSION_MAJOR 1
#define API_VERSION_MINOR 0

#define ERRORBUFSIZE 4096

struct FixedBuffer {
    void* data;
    size_t size;
};

static void set_handler(lua_State* state, const char* regname, uint64_t window_id, int ev) {
    lua_getfield(state, LUA_REGISTRYINDEX, regname); /*stack: window table*/ \
    lua_pushinteger(state, window_id); /*stack: window table, window id*/ \
    lua_gettable(state, -2); /*stack: window table, event table*/ \
    lua_pushinteger(state, ev); /*stack: window table, event table, event id*/ \
    if (lua_isfunction(state, 2)) { \
        lua_pushvalue(state, 2); \
    } else { \
        lua_pushnil(state); \
    } /*stack: window table, event table, event id, value*/ \
    lua_settable(state, -3); /*stack: window table, event table*/ \
    lua_pop(state, 2); /*stack: (empty)*/ \
}

#define SETMETATABLE(NAME) \
lua_getfield(state, LUA_REGISTRYINDEX, #NAME "meta"); \
lua_setmetatable(state, -2);

#define DEFINE_CALLBACK(APINAME) \
static int api_on##APINAME(lua_State* state) { \
    lua_pushliteral(state, #APINAME "cb"); \
    if (lua_isfunction(state, 1)) { \
        lua_pushvalue(state, 1); \
    } else { \
        lua_pushnil(state); \
    } \
    lua_settable(state, LUA_REGISTRYINDEX); \
    return 0; \
}

#define DEFINE_WINDOWEVENT(APINAME, REGNAME) \
static int api_window_on##APINAME(lua_State* state) { \
    const struct EmbeddedWindow* window = require_self_userdata(state, "on" #APINAME); \
    set_handler(state, WINDOWS_REGISTRYNAME, window->id, WINDOW_ON##REGNAME); \
    return 0; \
} \
DEFINE_BROWSEREVENT(APINAME, REGNAME)

#define DEFINE_BROWSEREVENT(APINAME, REGNAME) \
static int api_browser_on##APINAME(lua_State* state) { \
    const uint64_t* window_id = require_self_userdata(state, "on" #APINAME); \
    set_handler(state, BROWSERS_REGISTRYNAME, *window_id, BROWSER_ON##REGNAME); \
    return 0; \
}

static void* require_userdata(lua_State* state, int n, const char* apiname) {
    void* ret = lua_touserdata(state, n);
    if (!ret) {
        lua_pushfstring(state, "%s: incorrect argument at position %i, expected userdata", apiname, n);
        lua_error(state);
    }
    return ret;
}

static void* require_self_userdata(lua_State* state, const char* apiname) {
    void* ret = lua_touserdata(state, 1);
    if (!ret) {
        lua_pushfstring(state, "%s: incorrect first argument, expected userdata (did you mean to use ':' instead of '.'?)", apiname);
        lua_error(state);
    }
    return ret;
}

static void get_binary_data(lua_State* state, int n, const void** data, size_t* size) {
    if (lua_isuserdata(state, n)) {
        const struct FixedBuffer* buffer = lua_touserdata(state, n);
        *data = buffer->data;
        *size = buffer->size;
    } else {
        *data = luaL_checklstring(state, n, size);
    }
}

static int surface_gc(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const struct SurfaceFunctions* functions = lua_touserdata(state, 1);
    managed_functions->surface_destroy(functions->userdata);
    return 0;
}

static int buffer_gc(lua_State* state) {
    const struct FixedBuffer* buffer = lua_touserdata(state, 1);
    free(buffer->data);
    return 0;
}

static int shader_gc(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const struct ShaderFunctions* shader = lua_touserdata(state, 1);
    managed_functions->shader_destroy(shader->userdata);
    return 0;
}

static int shaderprogram_gc(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const struct ShaderProgramFunctions* program = lua_touserdata(state, 1);
    managed_functions->shader_program_destroy(program->userdata);
    return 0;
}

static int shaderbuffer_gc(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const struct ShaderBufferFunctions* buffer = lua_touserdata(state, 1);
    managed_functions->shader_buffer_destroy(buffer->userdata);
    return 0;
}

/* macros that generate handlers for Buffer objects */

#define DEFBUFFERINTERNAL(TYPE, FNAME, LUATYPE) \
static TYPE internal_buffer_get##FNAME(lua_State* state, const void* data, size_t data_size, long offset) { \
    TYPE ret; \
    if (offset < 0 || (offset + sizeof(TYPE)) > data_size) { \
        lua_pushfstring(state, "buffer get" #FNAME ": out-of-bounds read (buffer length %lu, reading at %li)", data_size, offset); \
        lua_error(state); \
    } \
    memcpy(&ret, (uint8_t*)data + offset, sizeof ret); \
    return ret; \
} \
static void internal_buffer_set##FNAME(lua_State* state, void* data, size_t data_size, long offset, TYPE value) { \
    if (offset < 0 || (offset + sizeof(TYPE)) > data_size) { \
        lua_pushfstring(state, "buffer set" #FNAME ": out-of-bounds write (buffer length %lu, writing at %li)", data_size, offset); \
        lua_error(state); \
    } \
    memcpy((uint8_t*)data + offset, &value, sizeof value); \
} \

#define DEFBUFFERINTERNAL_1BYTE(TYPE, FNAME, LUATYPE) \
static TYPE internal_buffer_get##FNAME(lua_State* state, const void* data, size_t data_size, long offset) { \
    if (offset < 0 || offset >= data_size) { \
        lua_pushfstring(state, "buffer get" #FNAME ": out-of-bounds read (buffer length %lu, reading at %li)", data_size, offset); \
        lua_error(state); \
    } \
    return ((TYPE*)data)[offset]; \
} \
static void internal_buffer_set##FNAME(lua_State* state, void* data, size_t data_size, long offset, TYPE value) { \
    if (offset < 0 || offset >= data_size) { \
        lua_pushfstring(state, "buffer set" #FNAME ": out-of-bounds write (buffer length %lu, writing at %li)", data_size, offset); \
        lua_error(state); \
    } \
    ((TYPE*)data)[offset] = value; \
}

#define DEFBUFFERAPI(TYPE, FNAME, LUATYPE) \
static int api_bufferget##FNAME(lua_State* state) { \
    size_t data_length; \
    const void* data; \
    get_binary_data(state, 1, &data, &data_length); \
    const long offset = luaL_checklong(state, 2); \
    const TYPE ret = internal_buffer_get##FNAME(state, data, data_length, offset); \
    lua_push##LUATYPE(state, ret); \
    return 1; \
} \
static int api_buffer_get##FNAME(lua_State* state) { \
    const struct FixedBuffer* buffer = require_self_userdata(state, "get" #FNAME); \
    const long offset = luaL_checklong(state, 2); \
    const TYPE ret = internal_buffer_get##FNAME(state, buffer->data, buffer->size, offset); \
    lua_push##LUATYPE(state, ret); \
    return 1; \
} \
static int api_buffer_set##FNAME(lua_State* state) { \
    const struct FixedBuffer* buffer = require_self_userdata(state, "set" #FNAME); \
    const long offset = luaL_checklong(state, 2); \
    const TYPE value = (TYPE)luaL_check##LUATYPE(state, 3); \
    internal_buffer_set##FNAME(state, buffer->data, buffer->size, offset, value); \
    return 0; \
}

#define DEFBUFFER(TYPE, FNAME, LUATYPE) DEFBUFFERINTERNAL(TYPE, FNAME, LUATYPE) DEFBUFFERAPI(TYPE, FNAME, LUATYPE)
#define DEFBUFFER_1BYTE(TYPE, FNAME, LUATYPE) DEFBUFFERINTERNAL_1BYTE(TYPE, FNAME, LUATYPE) DEFBUFFERAPI(TYPE, FNAME, LUATYPE)

/* API definitions start here */

DEFINE_CALLBACK(swapbuffers)
DEFINE_CALLBACK(render2d)
DEFINE_CALLBACK(render3d)
DEFINE_CALLBACK(renderparticles)
DEFINE_CALLBACK(rendericon)
DEFINE_CALLBACK(renderbigicon)
DEFINE_CALLBACK(minimapterrain)
DEFINE_CALLBACK(minimaprender2d)
DEFINE_CALLBACK(renderminimap)
DEFINE_CALLBACK(mousemotion)
DEFINE_CALLBACK(mousebutton)
DEFINE_CALLBACK(mousebuttonup)
DEFINE_CALLBACK(scroll)
DEFINE_WINDOWEVENT(reposition, REPOSITION)
DEFINE_WINDOWEVENT(mousemotion, MOUSEMOTION)
DEFINE_WINDOWEVENT(mousebutton, MOUSEBUTTON)
DEFINE_WINDOWEVENT(mousebuttonup, MOUSEBUTTONUP)
DEFINE_WINDOWEVENT(scroll, SCROLL)
DEFINE_WINDOWEVENT(mouseleave, MOUSELEAVE)
DEFINE_BROWSEREVENT(closerequest, CLOSEREQUEST)
DEFINE_BROWSEREVENT(message, MESSAGE)

static int api_apiversion(lua_State* state) {
    lua_pushnumber(state, API_VERSION_MAJOR);
    lua_pushnumber(state, API_VERSION_MINOR);
    return 2;
}

static int api_checkversion(lua_State* state) {
    lua_Integer expected_major = luaL_checkinteger(state, 1);
    lua_Integer expected_minor = luaL_checkinteger(state, 2);
    if (expected_major != API_VERSION_MAJOR) {
        lua_pushfstring(state, "checkversion major version mismatch: major version is %u, plugin expects %u", API_VERSION_MAJOR, (unsigned int)expected_major);
        lua_error(state);
    }
    if (expected_minor > API_VERSION_MINOR) {
        lua_pushfstring(state, "checkversion minor version mismatch: minor version is %u, plugin expects at least %u", API_VERSION_MINOR, (unsigned int)expected_minor);
        lua_error(state);
    }
    return 2;
}

static int api_close(lua_State* state) {
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    const uint64_t id = plugin->id;
    lua_pop(state, 1);
    _bolt_plugin_stop(id);
    _bolt_plugin_notify_stopped(id);
    return 0;
}

static int api_time(lua_State* state) {
    uint64_t micros;
    if (_bolt_monotonic_microseconds(&micros)) {
        lua_pushinteger(state, micros);
    } else {
        lua_pushnil(state);
    }
    return 1;
}

static int api_datetime(lua_State* state) {
    const time_t t = time(NULL);
    const struct tm* time = gmtime(&t);
    lua_pushinteger(state, time->tm_year + 1900);
    lua_pushinteger(state, time->tm_mon + 1);
    lua_pushinteger(state, time->tm_mday);
    lua_pushinteger(state, time->tm_hour);
    lua_pushinteger(state, time->tm_min);
    lua_pushinteger(state, time->tm_sec);
    return 6;
}

static int api_weekday(lua_State* state) {
    const time_t t = time(NULL);
    const struct tm* time = gmtime(&t);
    lua_pushinteger(state, time->tm_wday + 1);
    return 1;
}

static int api_playerposition(lua_State* state) {
    int32_t x, y, z;
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    managed_functions->player_position(&x, &y, &z);
    struct Point3D* point = lua_newuserdata(state, sizeof(struct Point3D));
    point->xyzh.ints[0] = x;
    point->xyzh.ints[1] = y;
    point->xyzh.ints[2] = z;
    point->integer = true;
    SETMETATABLE(point)
    return 1;
}

static int api_gamewindowsize(lua_State* state) {
    int w, h;
    _bolt_plugin_overlay_size(&w, &h);
    lua_pushinteger(state, w);
    lua_pushinteger(state, h);
    return 2;
}

static int api_gameviewxywh(lua_State* state) {
    int x, y, w, h;
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    managed_functions->game_view_rect(&x, &y, &w, &h);
    lua_pushinteger(state, x);
    lua_pushinteger(state, y);
    lua_pushinteger(state, w);
    lua_pushinteger(state, h);
    return 4;
}

static int api_flashwindow(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    managed_functions->flash_window();
    return 0;
}

static int api_isfocused(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    lua_pushboolean(state, managed_functions->window_has_focus());
    return 1;
}

static int api_characterid(lua_State* state) {
    const char* hash = _bolt_plugin_character_hash();
    lua_pushlstring(state, hash, CHARHASHSIZE);
    return 1;
}

static int api_loadfile(lua_State* state) {
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    size_t path_length;
    const char* path = luaL_checklstring(state, 1, &path_length);
    const size_t full_path_length = plugin->path_length + path_length + 1;
    char* full_path = lua_newuserdata(state, full_path_length);
    memcpy(full_path, plugin->path, plugin->path_length);
    memcpy(full_path + plugin->path_length, path, path_length + 1);
    for (char* c = full_path + plugin->path_length; *c; c += 1) {
        if (*c == '\\') *c = '/';
    }

    FILE* f = fopen(full_path, "rb");
    if (!f) {
        lua_pop(state, 2);
        lua_pushnil(state);
        return 1;
    }
    fseek(f, 0, SEEK_END);
    const long file_size = ftell(f);
    fseek(f, 0, SEEK_SET);
    void* content = lua_newuserdata(state, file_size);
    if (fread(content, 1, file_size, f) < file_size) {
        lua_pop(state, 3);
        lua_pushnil(state);
        fclose(f);
        return 1;
    }
    fclose(f);
    lua_pop(state, 3);
    lua_pushlstring(state, content, file_size);
    return 1;
}

static int api_loadconfig(lua_State* state) {
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    size_t path_length;
    const char* path = luaL_checklstring(state, 1, &path_length);
    const size_t full_path_length = plugin->config_path_length + path_length + 1;
    char* full_path = lua_newuserdata(state, full_path_length);
    memcpy(full_path, plugin->config_path, plugin->config_path_length);
    memcpy(full_path + plugin->config_path_length, path, path_length + 1);
    for (char* c = full_path + plugin->config_path_length; *c; c += 1) {
        if (*c == '\\') *c = '/';
    }

    FILE* f = fopen(full_path, "rb");
    if (!f) {
        lua_pop(state, 2);
        lua_pushnil(state);
        return 1;
    }
    fseek(f, 0, SEEK_END);
    const long file_size = ftell(f);
    fseek(f, 0, SEEK_SET);
    void* content = lua_newuserdata(state, file_size);
    if (fread(content, 1, file_size, f) < file_size) {
        lua_pop(state, 3);
        lua_pushnil(state);
        fclose(f);
        return 1;
    }
    fclose(f);
    lua_pop(state, 3);
    lua_pushlstring(state, content, file_size);
    return 1;
}

static int api_saveconfig(lua_State* state) {
    size_t path_length, content_length;
    const void* content;
    const char* path = luaL_checklstring(state, 1, &path_length);
    get_binary_data(state, 2, &content, &content_length);
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    const size_t full_path_length = plugin->config_path_length + path_length + 1;
    char* full_path = lua_newuserdata(state, full_path_length);
    memcpy(full_path, plugin->config_path, plugin->config_path_length);
    memcpy(full_path + plugin->config_path_length, path, path_length + 1);
    for (char* c = full_path + plugin->config_path_length; *c; c += 1) {
        if (*c == '\\') *c = '/';
    }

    FILE* f = fopen(full_path, "wb");
    if (!f) {
        lua_pop(state, 2);
        lua_pushboolean(state, false);
        return 1;
    }
    if (fwrite(content, 1, content_length, f) < content_length) {
        lua_pop(state, 2);
        lua_pushboolean(state, false);
        fclose(f);
        return 1;
    }
    fclose(f);
    lua_pop(state, 2);
    lua_pushboolean(state, true);
    return 1;
}

static int api_createsurface(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const lua_Integer w = luaL_checkinteger(state, 1);
    const lua_Integer h = luaL_checkinteger(state, 2);
    struct SurfaceFunctions* functions = lua_newuserdata(state, sizeof(struct SurfaceFunctions));
    managed_functions->surface_init(functions, w, h, NULL);
    SETMETATABLE(surface)
    return 1;
}

static int api_createsurfacefromrgba(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const lua_Integer w = luaL_checkinteger(state, 1);
    const lua_Integer h = luaL_checkinteger(state, 2);
    const size_t req_length = w * h * 4;
    size_t length;
    const void* rgba;
    get_binary_data(state, 3, &rgba, &length);
    struct SurfaceFunctions* functions = lua_newuserdata(state, sizeof(struct SurfaceFunctions));
    if (length >= req_length) {
        managed_functions->surface_init(functions, w, h, rgba);
    } else {
        uint8_t* ud = lua_newuserdata(state, req_length);
        memcpy(ud, rgba, length);
        memset(ud + length, 0, req_length - length);
        managed_functions->surface_init(functions, w, h, ud);
        lua_pop(state, 1);
    }
    SETMETATABLE(surface)
    return 1;
}

static int api_createsurfacefrompng(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    const char extension[] = ".png";
    size_t rgba_size, path_length;
    const char* path = luaL_checklstring(state, 1, &path_length);
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    const size_t full_path_length = plugin->path_length + path_length + sizeof(extension);
    char* full_path = lua_newuserdata(state, full_path_length);
    memcpy(full_path, plugin->path, plugin->path_length);
    memcpy(full_path + plugin->path_length, path, path_length + 1);
    for (char* c = full_path + plugin->path_length; *c; c += 1) {
        if (*c == '.') *c = '/';
    }
    memcpy(full_path + plugin->path_length + path_length, extension, sizeof(extension));
    FILE* f = fopen(full_path, "rb");
    if (!f) {
        lua_pushfstring(state, "createsurfacefrompng: error opening file '%s'", (char*)full_path);
        lua_error(state);
    }
    fseek(f, 0, SEEK_END);
    const long png_size = ftell(f);
    fseek(f, 0, SEEK_SET);
    void* png = lua_newuserdata(state, png_size);
    if (fread(png, 1, png_size, f) < png_size) {
        fclose(f);
        lua_pushfstring(state, "createsurfacefrompng: error reading file '%s'", (char*)full_path);
        lua_error(state);
    }
    fclose(f);

#define CALL_SPNG(FUNC, ...) err = FUNC(__VA_ARGS__); if(err){free(rgba);lua_pushfstring(state,"createsurfacefrompng: error decoding file '%s': " #FUNC " returned %i",(char*)full_path,err);lua_error(state);}
    void* rgba = NULL;
    int err;
    spng_ctx* spng = spng_ctx_new(0);
    CALL_SPNG(spng_set_png_buffer, spng, png, png_size);
    struct spng_ihdr ihdr;
    CALL_SPNG(spng_get_ihdr, spng, &ihdr)
    CALL_SPNG(spng_decoded_image_size, spng, SPNG_FMT_RGBA8, &rgba_size)
    rgba = malloc(rgba_size);
    CALL_SPNG(spng_decode_image, spng, rgba, rgba_size, SPNG_FMT_RGBA8, 0)
    spng_ctx_free(spng);
    lua_pop(state, 3);
#undef CALL_SPNG

    struct SurfaceFunctions* functions = lua_newuserdata(state, sizeof(struct SurfaceFunctions));
    managed_functions->surface_init(functions, ihdr.width, ihdr.height, rgba);
    SETMETATABLE(surface)
    lua_pushinteger(state, ihdr.width);
    lua_pushinteger(state, ihdr.height);
    free(rgba);
    return 3;
}

static int api_createwindow(lua_State* state) {
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    lua_pop(state, 1);
    
    // push a window onto the stack as the return value, then initialise it
    struct EmbeddedWindow* window = lua_newuserdata(state, sizeof(struct EmbeddedWindow));
    window->is_deleted = false;
    window->is_browser = false;
    window->popup_shown = false;
    window->do_capture = false;
    window->reposition_mode = false;
    window->id = _bolt_plugin_new_windowid();
    window->plugin_id = plugin->id;
    window->plugin = state;
    _bolt_rwlock_init(&window->lock);
    _bolt_rwlock_init(&window->input_lock);
    window->metadata.x = luaL_checkinteger(state, 1);
    window->metadata.y = luaL_checkinteger(state, 2);
    window->metadata.width = luaL_checkinteger(state, 3);
    window->metadata.height = luaL_checkinteger(state, 4);
    window->last_user_action_metadata = window->metadata;
    if (window->metadata.width < WINDOW_MIN_SIZE) window->metadata.width = WINDOW_MIN_SIZE;
    if (window->metadata.height < WINDOW_MIN_SIZE) window->metadata.height = WINDOW_MIN_SIZE;
    memset(&window->input, 0, sizeof(window->input));
    managed_functions->surface_init(&window->surface_functions, window->metadata.width, window->metadata.height, NULL);
    SETMETATABLE(window)

    // create an event table in the registry for this window
    lua_getfield(state, LUA_REGISTRYINDEX, WINDOWS_REGISTRYNAME);
    lua_pushinteger(state, window->id);
    lua_createtable(state, WINDOW_EVENT_ENUM_SIZE, 0);
    lua_pushinteger(state, WINDOW_USERDATA);
    lua_pushvalue(state, -5);
    lua_settable(state, -3);
    lua_settable(state, -3);
    lua_pop(state, 1);

    // set this window in the hashmap, which is accessible by backends
    struct WindowInfo* windows = _bolt_plugin_windowinfo();
    _bolt_rwlock_lock_write(&windows->lock);
    hashmap_set(windows->map, &window);
    _bolt_rwlock_unlock_write(&windows->lock);
    return 1;
}

static int api_createbrowser(lua_State* state) {
    const int w = luaL_checkinteger(state, 1);
    const int h = luaL_checkinteger(state, 2);
    size_t url_length;
    const char* url = luaL_checklstring(state, 3, &url_length);
    const char* custom_js = NULL;
    size_t len;
    if (lua_gettop(state) >= 4 && !lua_isnil(state, 4)) {
        custom_js = luaL_checklstring(state, 4, &len);
    }
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    struct Plugin* plugin = lua_touserdata(state, -1);
    lua_pop(state, 1);

    // push a window onto the stack as the return value, then initialise it
    struct ExternalBrowser* browser = lua_newuserdata(state, sizeof(struct ExternalBrowser));
    browser->id = _bolt_plugin_new_windowid();
    browser->plugin_id = plugin->id;
    browser->plugin = plugin;
    browser->do_capture = false;
    browser->capture_id = 0;
    SETMETATABLE(browser)

    // create an empty event table in the registry for this window
    lua_getfield(state, LUA_REGISTRYINDEX, BROWSERS_REGISTRYNAME);
    lua_pushinteger(state, browser->id);
    lua_createtable(state, BROWSER_EVENT_ENUM_SIZE, 0);
    lua_settable(state, -3);
    lua_pop(state, 1);

    // send an IPC message to the host to create a browser
    const int pid = getpid();
    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_CREATEBROWSER_EXTERNAL;
    const struct BoltIPCCreateBrowserHeader header = {
        .plugin_id = plugin->id,
        .window_id = browser->id,
        .url_length = url_length,
        .pid = pid,
        .w = w,
        .h = h,
        .has_custom_js = custom_js != NULL,
        .custom_js_length = len,
    };
    const uint32_t url_length32 = (uint32_t)url_length;
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    _bolt_ipc_send(fd, url, url_length32);
    if (custom_js) _bolt_ipc_send(fd, custom_js, len);

    // add to the hashmap
    hashmap_set(plugin->external_browsers, &browser);
    return 1;
}

static int api_createembeddedbrowser(lua_State* state) {
    const int x = luaL_checkinteger(state, 1);
    const int y = luaL_checkinteger(state, 2);
    const int w = luaL_checkinteger(state, 3);
    const int h = luaL_checkinteger(state, 4);
    size_t url_length;
    const char* url = luaL_checklstring(state, 5, &url_length);
    const char* custom_js = NULL;
    size_t custom_js_len;
    if (lua_gettop(state) >= 6 && !lua_isnil(state, 6)) {
        custom_js = luaL_checklstring(state, 6, &custom_js_len);
    }

    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    lua_pop(state, 1);

    // push a window onto the stack as the return value, then initialise it
    struct EmbeddedWindow* window = lua_newuserdata(state, sizeof(struct EmbeddedWindow));
    const uint64_t id = _bolt_plugin_new_windowid();
    if (!_bolt_plugin_shm_open_inbound(&window->browser_shm, "eb", id)) {
        lua_pushliteral(state, "createembeddedbrowser: failed to create shm object");
        lua_error(state);
    }
    window->is_deleted = false;
    window->is_browser = true;
    window->popup_shown = false;
    window->do_capture = false;
    window->capture_id = 0;
    window->popup_initialised = false;
    window->popup_meta.x = 0;
    window->popup_meta.y = 0;
    window->reposition_mode = false;
    window->id = id;
    window->plugin_id = plugin->id;
    window->plugin = state;
    _bolt_rwlock_init(&window->lock);
    _bolt_rwlock_init(&window->input_lock);
    window->metadata.x = x;
    window->metadata.y = y;
    window->metadata.width = w;
    window->metadata.height = h;
    window->last_user_action_metadata = window->metadata;
    if (window->metadata.width < WINDOW_MIN_SIZE) window->metadata.width = WINDOW_MIN_SIZE;
    if (window->metadata.height < WINDOW_MIN_SIZE) window->metadata.height = WINDOW_MIN_SIZE;
    memset(&window->input, 0, sizeof(window->input));
    managed_functions->surface_init(&window->surface_functions, window->metadata.width, window->metadata.height, NULL);
    SETMETATABLE(embeddedbrowser)

    // create an event table in the registry for this window
    lua_getfield(state, LUA_REGISTRYINDEX, BROWSERS_REGISTRYNAME);
    lua_pushinteger(state, window->id);
    lua_createtable(state, BROWSER_EVENT_ENUM_SIZE, 0);
    lua_pushinteger(state, BROWSER_USERDATA);
    lua_pushvalue(state, -5);
    lua_settable(state, -3);
    lua_settable(state, -3);
    lua_pop(state, 1);

    // send an IPC message to the host to create an OSR browser
    const int pid = getpid();
    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_CREATEBROWSER_OSR;
    const struct BoltIPCCreateBrowserHeader header = {
        .plugin_id = plugin->id,
        .window_id = window->id,
        .url_length = url_length,
        .pid = pid,
        .w = window->metadata.width,
        .h = window->metadata.height,
        .has_custom_js = custom_js != NULL,
        .custom_js_length = custom_js_len,
    };
    const uint32_t url_length32 = (uint32_t)url_length;
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    _bolt_ipc_send(fd, url, url_length32);
    if (custom_js) _bolt_ipc_send(fd, custom_js, custom_js_len);

    // set this window in the hashmap, which is accessible by backends
    struct WindowInfo* windows = _bolt_plugin_windowinfo();
    _bolt_rwlock_lock_write(&windows->lock);
    hashmap_set(windows->map, &window);
    _bolt_rwlock_unlock_write(&windows->lock);
    return 1;
}

static int api_point(lua_State* state) {
    struct Point3D* point = lua_newuserdata(state, sizeof(struct Point3D));
    point->xyzh.floats[0] = luaL_checknumber(state, 1);
    point->xyzh.floats[1] = luaL_checknumber(state, 2);
    point->xyzh.floats[2] = luaL_checknumber(state, 3);
    point->xyzh.floats[3] = 1.0;
    point->integer = false;
    point->homogenous = false;
    SETMETATABLE(point)
    return 1;
}

static int api_createbuffer(lua_State* state) {
    const long size = luaL_checklong(state, 1);
    struct FixedBuffer* buffer = lua_newuserdata(state, sizeof(struct FixedBuffer));
    buffer->data = calloc(size, 1);
    if (!buffer->data) {
        lua_pushfstring(state, "createbuffer: heap error, failed to allocate %i bytes", size);
        lua_error(state);
    }
    buffer->size = size;
    SETMETATABLE(buffer)
    return 1;
}

static int api_createvertexshader(lua_State* state) {
    const struct PluginManagedFunctions* functions = _bolt_plugin_managed_functions();
    size_t len;
    const char* source = luaL_checklstring(state, 1, &len);
    if (len >= INT_MAX) {
        lua_pushfstring(state, "createvertexshader: source is too long (%lu bytes, max is %i)", len, source);
        lua_error(state);
    }
    char buf[ERRORBUFSIZE];
    struct ShaderFunctions* shader = lua_newuserdata(state, sizeof(struct ShaderFunctions));
    if (!functions->vertex_shader_init(shader, source, len, buf, ERRORBUFSIZE)) {
        lua_pushfstring(state, "createvertexshader: shader compilation error: %s", buf);
        lua_error(state);
    }
    SETMETATABLE(shader)
    return 1;
}

static int api_createfragmentshader(lua_State* state) {
    const struct PluginManagedFunctions* functions = _bolt_plugin_managed_functions();
    size_t len;
    const char* source = luaL_checklstring(state, 1, &len);
    if (len >= INT_MAX) {
        lua_pushfstring(state, "createfragmentshader: source is too long (%lu bytes, max is %i)", len, source);
        lua_error(state);
    }
    char buf[ERRORBUFSIZE];
    struct ShaderFunctions* shader = lua_newuserdata(state, sizeof(struct ShaderFunctions));
    if (!functions->fragment_shader_init(shader, source, len, buf, ERRORBUFSIZE)) {
        lua_pushfstring(state, "createfragmentshader: shader compilation error: %s", buf);
        lua_error(state);
    }
    SETMETATABLE(shader)
    return 1;
}

static int api_createshaderprogram(lua_State* state) {
    const struct PluginManagedFunctions* functions = _bolt_plugin_managed_functions();
    const struct ShaderFunctions* vertex = require_userdata(state, 1, "createshaderprogram");
    const struct ShaderFunctions* fragment = require_userdata(state, 2, "createshaderprogram");
    struct ShaderProgramFunctions* program = lua_newuserdata(state, sizeof(struct ShaderProgramFunctions));
    SETMETATABLE(shaderprogram)
    char buf[ERRORBUFSIZE];
    if (!functions->shader_program_init(program, vertex->userdata, fragment->userdata, buf, ERRORBUFSIZE)) {
        lua_pushfstring(state, "createshaderprogram: link error: %s", buf);
        lua_error(state);
    }
    return 1;
}

static int api_createshaderbuffer(lua_State* state) {
    const struct PluginManagedFunctions* functions = _bolt_plugin_managed_functions();
    size_t length;
    const void* data;
    get_binary_data(state, 1, &data, &length);
    struct ShaderBufferFunctions* buffer = lua_newuserdata(state, sizeof(struct ShaderBufferFunctions));
    functions->shader_buffer_init(buffer, data, length);
    SETMETATABLE(shaderbuffer)
    return 1;
}

static int api_batch2d_vertexcount(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "vertexcount");
    lua_pushinteger(state, batch->index_count);
    return 1;
}

static int api_batch2d_verticesperimage(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "verticesperimage");
    lua_pushinteger(state, batch->vertices_per_icon);
    return 1;
}

static int api_batch2d_targetsize(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "targetsize");
    lua_pushinteger(state, batch->screen_width);
    lua_pushinteger(state, batch->screen_height);
    return 2;
}

static int api_batch2d_vertexxy(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "vertexxy");
    const lua_Integer index = luaL_checkinteger(state, 2);
    int32_t xy[2];
    batch->vertex_functions.xy(index - 1, batch->vertex_functions.userdata, xy);
    lua_pushinteger(state, xy[0]);
    lua_pushinteger(state, xy[1]);
    return 2;
}

static int api_batch2d_vertexatlasdetails(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "vertexatlasxy");
    const lua_Integer index = luaL_checkinteger(state, 2);
    int32_t xywh[4];
    uint8_t wrapx, wrapy;
    batch->vertex_functions.atlas_details(index - 1, batch->vertex_functions.userdata, xywh, &wrapx, &wrapy);
    lua_pushnumber(state, xywh[0]);
    lua_pushnumber(state, xywh[1]);
    lua_pushnumber(state, xywh[2]);
    lua_pushnumber(state, xywh[3]);
    lua_pushboolean(state, wrapx);
    lua_pushboolean(state, wrapy);
    return 6;
}

static int api_batch2d_vertexuv(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "vertexuv");
    const lua_Integer index = lua_tointeger(state, 2);
    double uv[2];
    uint8_t discard;
    batch->vertex_functions.uv(index - 1, batch->vertex_functions.userdata, uv, &discard);
    if (discard) {
        lua_pushnil(state);
        lua_pushnil(state);
    } else {
        lua_pushnumber(state, uv[0]);
        lua_pushnumber(state, uv[1]);
    }
    return 2;
}

static int api_batch2d_vertexcolour(lua_State* state) {
    const struct RenderBatch2D* batch = require_self_userdata(state, "vertexcolour");
    const lua_Integer index = luaL_checkinteger(state, 2);
    double colour[4];
    batch->vertex_functions.colour(index - 1, batch->vertex_functions.userdata, colour);
    lua_pushnumber(state, colour[0]);
    lua_pushnumber(state, colour[1]);
    lua_pushnumber(state, colour[2]);
    lua_pushnumber(state, colour[3]);
    return 4;
}

static int api_batch2d_textureid(lua_State* state) {
    const struct RenderBatch2D* render = require_self_userdata(state, "textureid");
    const size_t id = render->texture_functions.id(render->texture_functions.userdata);
    lua_pushinteger(state, id);
    return 1;
}

static int api_batch2d_texturesize(lua_State* state) {
    const struct RenderBatch2D* render = require_self_userdata(state, "texturesize");
    size_t size[2];
    render->texture_functions.size(render->texture_functions.userdata, size);
    lua_pushinteger(state, size[0]);
    lua_pushinteger(state, size[1]);
    return 2;
}

static int api_batch2d_texturecompare(lua_State* state) {
    const struct RenderBatch2D* render = require_self_userdata(state, "texturecompare");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    size_t data_len;
    const void* data;
    get_binary_data(state, 4, &data, &data_len);
    const uint8_t match = render->texture_functions.compare(render->texture_functions.userdata, x, y, data_len, (const unsigned char*)data);
    lua_pushboolean(state, match);
    return 1;
}

static int api_batch2d_texturedata(lua_State* state) {
    const struct RenderBatch2D* render = require_self_userdata(state, "texturedata");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    const size_t len = luaL_checkinteger(state, 4);
    const uint8_t* ret = render->texture_functions.data(render->texture_functions.userdata, x, y);
    lua_pushlstring(state, (const char*)ret, len);
    return 1;
}

static int api_minimapterrain_angle(lua_State* state) {
    const struct MinimapTerrainEvent* render = require_self_userdata(state, "angle");
    lua_pushnumber(state, render->angle);
    return 1;
}

static int api_minimapterrain_scale(lua_State* state) {
    const struct MinimapTerrainEvent* render = require_self_userdata(state, "scale");
    lua_pushnumber(state, render->scale);
    return 1;
}

static int api_minimapterrain_position(lua_State* state) {
    const struct MinimapTerrainEvent* render = require_self_userdata(state, "position");
    lua_pushnumber(state, render->x);
    lua_pushnumber(state, render->y);
    return 2;
}

static int api_renderminimap_sourcexywh(lua_State* state) {
    const struct RenderMinimapEvent* render = require_self_userdata(state, "sourcexywh");
    lua_pushinteger(state, render->source_x);
    lua_pushinteger(state, render->source_y);
    lua_pushinteger(state, render->source_w);
    lua_pushinteger(state, render->source_h);
    return 4;
}

static int api_renderminimap_targetxywh(lua_State* state) {
    const struct RenderMinimapEvent* render = require_self_userdata(state, "targetxywh");
    lua_pushinteger(state, render->target_x);
    lua_pushinteger(state, render->target_y);
    lua_pushinteger(state, render->target_w);
    lua_pushinteger(state, render->target_h);
    return 4;
}

static int api_renderminimap_targetsize(lua_State* state) {
    const struct RenderMinimapEvent* render = require_self_userdata(state, "targetsize");
    lua_pushinteger(state, render->screen_width);
    lua_pushinteger(state, render->screen_height);
    return 2;
}

static int api_point_transform(lua_State* state) {
    const struct Point3D* point = require_self_userdata(state, "transform");
    const struct Transform3D* transform = require_userdata(state, 2, "transform");
    double x, y, z, h;
    if (point->integer) {
        x = (double)point->xyzh.ints[0];
        y = (double)point->xyzh.ints[1];
        z = (double)point->xyzh.ints[2];
        h = 1.0;
    } else {
        x = point->xyzh.floats[0];
        y = point->xyzh.floats[1];
        z = point->xyzh.floats[2];
        h = point->xyzh.floats[3];
    }
    struct Point3D* out = lua_newuserdata(state, sizeof(struct Point3D));
    out->xyzh.floats[0] = (x * transform->matrix[0]) + (y * transform->matrix[4]) + (z * transform->matrix[8]) + (h * transform->matrix[12]);
    out->xyzh.floats[1] = (x * transform->matrix[1]) + (y * transform->matrix[5]) + (z * transform->matrix[9]) + (h * transform->matrix[13]);
    out->xyzh.floats[2] = (x * transform->matrix[2]) + (y * transform->matrix[6]) + (z * transform->matrix[10]) + (h * transform->matrix[14]);
    out->xyzh.floats[3] = (x * transform->matrix[3]) + (y * transform->matrix[7]) + (z * transform->matrix[11]) + (h * transform->matrix[15]);
    out->integer = false;
    out->homogenous = true;
    SETMETATABLE(point)
    return 1;
}

static int api_point_get(lua_State* state) {
    const struct Point3D* point = require_self_userdata(state, "get");
    if (point->integer) {
        lua_pushinteger(state, point->xyzh.ints[0]);
        lua_pushinteger(state, point->xyzh.ints[1]);
        lua_pushinteger(state, point->xyzh.ints[2]);
    } else if (!point->homogenous) {
        lua_pushnumber(state, point->xyzh.floats[0]);
        lua_pushnumber(state, point->xyzh.floats[1]);
        lua_pushnumber(state, point->xyzh.floats[2]);
    } else {
        lua_pushnumber(state, point->xyzh.floats[0] / point->xyzh.floats[3]);
        lua_pushnumber(state, point->xyzh.floats[1] / point->xyzh.floats[3]);
        lua_pushnumber(state, point->xyzh.floats[2] / point->xyzh.floats[3]);
    }
    return 3;
}

static int api_point_aspixels(lua_State* state) {
    const struct Point3D* point = require_self_userdata(state, "aspixels");
    int game_view_x, game_view_y, game_view_w, game_view_h;
    const struct PluginManagedFunctions* managed_functions = _bolt_plugin_managed_functions();
    managed_functions->game_view_rect(&game_view_x, &game_view_y, &game_view_w, &game_view_h);
    double x, y, depth;
    if (point->integer) {
        x = (double)point->xyzh.ints[0];
        y = (double)point->xyzh.ints[1];
        depth = (double)point->xyzh.ints[2];
    } else if (!point->homogenous) {
        x = point->xyzh.floats[0];
        y = point->xyzh.floats[1];
        depth = point->xyzh.floats[2];
    } else {
        x = point->xyzh.floats[0] / point->xyzh.floats[3];
        y = point->xyzh.floats[1] / point->xyzh.floats[3];
        depth = point->xyzh.floats[2] / point->xyzh.floats[3];
    }
    lua_pushnumber(state, ((x  + 1.0) * game_view_w / 2.0) + (double)game_view_x);
    lua_pushnumber(state, ((-y + 1.0) * game_view_h / 2.0) + (double)game_view_y);
    lua_pushnumber(state, depth);
    return 3;
}

#define LENGTH(N1, N2, N3) sqrt((N1 * N1) + (N2 * N2) + (N3 * N3))
static int api_transform_decompose(lua_State* state) {
    const struct Transform3D* transform = require_self_userdata(state, "decompose");
    lua_pushnumber(state, transform->matrix[12]);
    lua_pushnumber(state, transform->matrix[13]);
    lua_pushnumber(state, transform->matrix[14]);
    const double scale_x = LENGTH(transform->matrix[0], transform->matrix[1], transform->matrix[2]);
    const double scale_y = LENGTH(transform->matrix[4], transform->matrix[5], transform->matrix[6]);
    const double scale_z = LENGTH(transform->matrix[8], transform->matrix[9], transform->matrix[10]);
    lua_pushnumber(state, scale_x);
    lua_pushnumber(state, scale_y);
    lua_pushnumber(state, scale_z);
    if (scale_x == 0.0 || scale_y == 0.0 || scale_z == 0.0) {
        // scale=0 means we can't calculate angles because there would be a division by zero,
        // and angle is meaningless for a zero-scale model anyway, so just put 0 for all the angles
        lua_pushnumber(state, 0.0);
        lua_pushnumber(state, 0.0);
        lua_pushnumber(state, 0.0);
    } else {
        // see https://stackoverflow.com/questions/39128589/decomposing-rotation-matrix-x-y-z-cartesian-angles
        const double yaw = atan2(-(transform->matrix[8] / scale_z), sqrt((transform->matrix[0] * transform->matrix[0] / (scale_x * scale_x)) + (transform->matrix[4] * transform->matrix[4] / (scale_y * scale_y))));
        const double pitch = atan2((transform->matrix[9] / scale_z) / cos(yaw), (transform->matrix[10] / scale_z) / cos(yaw));
        const double roll = atan2((transform->matrix[4] / scale_y) / cos(yaw), (transform->matrix[0] / scale_x) / cos(yaw));
        lua_pushnumber(state, yaw);
        lua_pushnumber(state, pitch);
        lua_pushnumber(state, roll);
    }
    return 9;
}
#undef LENGTH

static int api_transform_get(lua_State* state) {
    const struct Transform3D* transform = require_self_userdata(state, "get");
    for (size_t i = 0; i < 16; i += 1) {
        lua_pushnumber(state, transform->matrix[i]);
    }
    return 16;
}

static int api_surface_clear(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "clear");
    const int argc = lua_gettop(state);
    const double r = (argc >= 2) ? luaL_checknumber(state, 2) : 0.0;
    const double g = (argc >= 3) ? luaL_checknumber(state, 3) : r;
    const double b = (argc >= 4) ? luaL_checknumber(state, 4) : r;
    const double a = (argc >= 5) ? luaL_checknumber(state, 5) : ((argc > 1) ? 1.0 : 0.0);
    functions->clear(functions->userdata, r, g, b, a);
    return 0;
}

static int api_surface_subimage(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "subimage");
    const lua_Integer x = luaL_checkinteger(state, 2);
    const lua_Integer y = luaL_checkinteger(state, 3);
    const lua_Integer w = luaL_checkinteger(state, 4);
    const lua_Integer h = luaL_checkinteger(state, 5);
    const size_t req_length = w * h * 4;
    size_t length;
    const void* rgba;
    get_binary_data(state, 6, &rgba, &length);
    if (length >= req_length) {
        functions->subimage(functions->userdata, x, y, w, h, rgba, 0);
    } else {
        uint8_t* ud = lua_newuserdata(state, req_length);
        memcpy(ud, rgba, length);
        memset(ud + length, 0, req_length - length);
        functions->subimage(functions->userdata, x, y, w, h, (const void*)ud, 0);
        lua_pop(state, 1);
    }
    return 0;
}

static int api_surface_drawtoscreen(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "drawtoscreen");
    const int sx = luaL_checkinteger(state, 2);
    const int sy = luaL_checkinteger(state, 3);
    const int sw = luaL_checkinteger(state, 4);
    const int sh = luaL_checkinteger(state, 5);
    const int dx = luaL_checkinteger(state, 6);
    const int dy = luaL_checkinteger(state, 7);
    const int dw = luaL_checkinteger(state, 8);
    const int dh = luaL_checkinteger(state, 9);
    _bolt_plugin_draw_to_overlay(functions, sx, sy, sw, sh, dx, dy, dw, dh);
    return 0;
}

static int api_surface_drawtosurface(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "drawtosurface");
    const struct SurfaceFunctions* target = require_userdata(state, 2, "drawtosurface");
    const int sx = luaL_checkinteger(state, 3);
    const int sy = luaL_checkinteger(state, 4);
    const int sw = luaL_checkinteger(state, 5);
    const int sh = luaL_checkinteger(state, 6);
    const int dx = luaL_checkinteger(state, 7);
    const int dy = luaL_checkinteger(state, 8);
    const int dw = luaL_checkinteger(state, 9);
    const int dh = luaL_checkinteger(state, 10);
    functions->draw_to_surface(functions->userdata, target->userdata, sx, sy, sw, sh, dx, dy, dw, dh);
    return 0;
}

static int api_surface_drawtowindow(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "drawtowindow");
    const struct EmbeddedWindow* target = require_userdata(state, 2, "drawtowindow");
    const int sx = luaL_checkinteger(state, 3);
    const int sy = luaL_checkinteger(state, 4);
    const int sw = luaL_checkinteger(state, 5);
    const int sh = luaL_checkinteger(state, 6);
    const int dx = luaL_checkinteger(state, 7);
    const int dy = luaL_checkinteger(state, 8);
    const int dw = luaL_checkinteger(state, 9);
    const int dh = luaL_checkinteger(state, 10);
    functions->draw_to_surface(functions->userdata, target->surface_functions.userdata, sx, sy, sw, sh, dx, dy, dw, dh);
    return 0;
}

static int api_surface_settint(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "settint");
    const lua_Number r = luaL_checknumber(state, 2);
    const lua_Number g = luaL_checknumber(state, 3);
    const lua_Number b = luaL_checknumber(state, 4);
    functions->set_tint(functions->userdata, r, g, b);
    return 0;
}

static int api_surface_setalpha(lua_State* state) {
    const struct SurfaceFunctions* functions = require_self_userdata(state, "setalpha");
    const lua_Number alpha = luaL_checknumber(state, 2);
    functions->set_alpha(functions->userdata, alpha);
    return 0;
}

static int api_window_close(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "state");
    window->is_deleted = true;
    return 0;
}

static int api_window_clear(lua_State* state) {
    const struct EmbeddedWindow* window = require_self_userdata(state, "clear");
    const int argc = lua_gettop(state);
    const double r = (argc >= 2) ? luaL_checknumber(state, 2) : 0.0;
    const double g = (argc >= 3) ? luaL_checknumber(state, 3) : r;
    const double b = (argc >= 4) ? luaL_checknumber(state, 4) : r;
    const double a = (argc >= 5) ? luaL_checknumber(state, 5) : ((argc > 1) ? 1.0 : 0.0);
    window->surface_functions.clear(window->surface_functions.userdata, r, g, b, a);
    return 0;
}

static int api_window_id(lua_State* state) {
    const struct EmbeddedWindow* window = require_self_userdata(state, "id");
    lua_pushinteger(state, window->id);
    return 1;
}

static int api_window_subimage(lua_State* state) {
    const struct EmbeddedWindow* window = require_self_userdata(state, "subimage");
    const lua_Integer x = luaL_checkinteger(state, 2);
    const lua_Integer y = luaL_checkinteger(state, 3);
    const lua_Integer w = luaL_checkinteger(state, 4);
    const lua_Integer h = luaL_checkinteger(state, 5);
    const size_t req_length = w * h * 4;
    size_t length;
    const void* rgba;
    get_binary_data(state, 6, &rgba, &length);
    if (length >= req_length) {
        window->surface_functions.subimage(window->surface_functions.userdata, x, y, w, h, rgba, 0);
    } else {
        uint8_t* ud = lua_newuserdata(state, req_length);
        memcpy(ud, rgba, length);
        memset(ud + length, 0, req_length - length);
        window->surface_functions.subimage(window->surface_functions.userdata, x, y, w, h, (const void*)ud, 0);
        lua_pop(state, 1);
    }
    return 0;
}

static int api_window_startreposition(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "startreposition");
    const lua_Integer xscale = luaL_checkinteger(state, 2);
    const lua_Integer yscale = luaL_checkinteger(state, 3);
    window->reposition_mode = true;
    window->reposition_threshold = false;
    window->reposition_w = (xscale == 0) ? 0 : ((xscale > 0) ? 1 : -1);
    window->reposition_h = (yscale == 0) ? 0 : ((yscale > 0) ? 1 : -1);
    return 0;
}

static int api_window_cancelreposition(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "cancelreposition");
    window->reposition_mode = false;
    return 0;
}

static int api_window_xywh(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "xywh");
    _bolt_rwlock_lock_read(&window->lock);
    lua_pushinteger(state, window->metadata.x);
    lua_pushinteger(state, window->metadata.y);
    lua_pushinteger(state, window->metadata.width);
    lua_pushinteger(state, window->metadata.height);
    _bolt_rwlock_unlock_read(&window->lock);
    return 4;
}

static int api_render3d_vertexcount(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexcount");
    lua_pushinteger(state, render->vertex_count);
    return 1;
}

static int api_render3d_vertexpoint(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexpoint");
    const lua_Integer index = lua_tointeger(state, 2);
    struct Point3D* point = lua_newuserdata(state, sizeof(struct Point3D));
    render->vertex_functions.xyz(index - 1, render->vertex_functions.userdata, point);
    SETMETATABLE(point)
    return 1;
}

static int api_render3d_modelmatrix(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "modelmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.model_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_render3d_viewmatrix(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "viewmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.view_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_render3d_projectionmatrix(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "projectionmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.proj_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_render3d_viewprojmatrix(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "viewprojmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.viewproj_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_render3d_vertexmeta(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexmeta");
    const lua_Integer index = luaL_checkinteger(state, 2);
    size_t meta = render->vertex_functions.atlas_meta(index - 1, render->vertex_functions.userdata);
    lua_pushinteger(state, meta);
    return 1;
}

static int api_render3d_atlasxywh(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "atlasxywh");
    const lua_Integer meta = luaL_checkinteger(state, 2);
    int32_t xywh[4];
    render->vertex_functions.atlas_xywh(meta, render->vertex_functions.userdata, xywh);
    lua_pushinteger(state, xywh[0]);
    lua_pushinteger(state, xywh[1]);
    lua_pushinteger(state, xywh[2]);
    lua_pushinteger(state, xywh[3]);
    return 4;
}

static int api_render3d_vertexuv(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexuv");
    const lua_Integer index = luaL_checkinteger(state, 2);
    double uv[4];
    render->vertex_functions.uv(index - 1, render->vertex_functions.userdata, uv);
    lua_pushnumber(state, uv[0]);
    lua_pushnumber(state, uv[1]);
    return 2;
}

static int api_render3d_vertexcolour(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexcolour");
    const lua_Integer index = luaL_checkinteger(state, 2);
    double col[4];
    render->vertex_functions.colour(index - 1, render->vertex_functions.userdata, col);
    lua_pushnumber(state, col[0]);
    lua_pushnumber(state, col[1]);
    lua_pushnumber(state, col[2]);
    lua_pushnumber(state, col[3]);
    return 4;
}

static int api_render3d_textureid(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "textureid");
    const size_t id = render->texture_functions.id(render->texture_functions.userdata);
    lua_pushinteger(state, id);
    return 1;
}

static int api_render3d_texturesize(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "texturesize");
    size_t size[2];
    render->texture_functions.size(render->texture_functions.userdata, size);
    lua_pushinteger(state, size[0]);
    lua_pushinteger(state, size[1]);
    return 2;
}

static int api_render3d_texturecompare(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "texturecompare");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    size_t data_len;
    const void* data;
    get_binary_data(state, 4, &data, &data_len);
    const uint8_t match = render->texture_functions.compare(render->texture_functions.userdata, x, y, data_len, (const unsigned char*)data);
    lua_pushboolean(state, match);
    return 1;
}

static int api_render3d_texturedata(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "texturedata");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    const size_t len = luaL_checkinteger(state, 4);
    const uint8_t* ret = render->texture_functions.data(render->texture_functions.userdata, x, y);
    lua_pushlstring(state, (const char*)ret, len);
    return 1;
}

static int api_render3d_vertexanimation(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "vertexanimation");
    const lua_Integer vertex = luaL_checkinteger(state, 2);

    if (!render->is_animated) {
        lua_pushliteral(state, "boneanimation: cannot get bone transforms for non-animated model");
        lua_error(state);
    }

    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->vertex_functions.bone_transform(vertex - 1, render->vertex_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_render3d_animated(lua_State* state) {
    const struct Render3D* render = require_self_userdata(state, "animated");
    lua_pushboolean(state, render->is_animated);
    return 1;
}

static int api_renderparticles_vertexcount(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexcount");
    lua_pushinteger(state, render->vertex_count);
    return 1;
}

static int api_renderparticles_vertexparticleorigin(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexparticleorigin");
    const lua_Integer vertex = luaL_checkinteger(state, 2);
    struct Point3D* point = lua_newuserdata(state, sizeof(struct Point3D));
    render->vertex_functions.xyz(vertex - 1, render->vertex_functions.userdata, point);
    SETMETATABLE(point)
    return 1;
}

static int api_renderparticles_vertexworldoffset(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexworldoffset");
    const lua_Integer vertex = luaL_checkinteger(state, 2);
    double offset[3];
    render->vertex_functions.world_offset(vertex - 1, render->vertex_functions.userdata, offset);
    lua_pushnumber(state, offset[0]);
    lua_pushnumber(state, offset[1]);
    lua_pushnumber(state, offset[2]);
    return 3;
}

static int api_renderparticles_vertexeyeoffset(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexeyeoffset");
    const lua_Integer vertex = luaL_checkinteger(state, 2);
    double offset[2];
    render->vertex_functions.eye_offset(vertex - 1, render->vertex_functions.userdata, offset);
    lua_pushnumber(state, offset[0]);
    lua_pushnumber(state, offset[1]);
    return 2;
}

static int api_renderparticles_vertexuv(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexuv");
    const lua_Integer vertex = luaL_checkinteger(state, 2);
    double uv[2];
    render->vertex_functions.uv(vertex - 1, render->vertex_functions.userdata, uv);
    lua_pushnumber(state, uv[0]);
    lua_pushnumber(state, uv[1]);
    return 2;
}

static int api_renderparticles_vertexcolour(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexcolour");
    const lua_Integer index = luaL_checkinteger(state, 2);
    double col[4];
    render->vertex_functions.colour(index - 1, render->vertex_functions.userdata, col);
    lua_pushnumber(state, col[0]);
    lua_pushnumber(state, col[1]);
    lua_pushnumber(state, col[2]);
    lua_pushnumber(state, col[3]);
    return 4;
}

static int api_renderparticles_vertexmeta(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "vertexmeta");
    const lua_Integer index = luaL_checkinteger(state, 2);
    size_t meta = render->vertex_functions.atlas_meta(index - 1, render->vertex_functions.userdata);
    lua_pushinteger(state, meta);
    return 1;
}

static int api_renderparticles_atlasxywh(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "atlasxywh");
    const lua_Integer meta = luaL_checkinteger(state, 2);
    int32_t xywh[4];
    render->vertex_functions.atlas_xywh(meta, render->vertex_functions.userdata, xywh);
    lua_pushinteger(state, xywh[0]);
    lua_pushinteger(state, xywh[1]);
    lua_pushinteger(state, xywh[2]);
    lua_pushinteger(state, xywh[3]);
    return 4;
}

static int api_renderparticles_textureid(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "textureid");
    const size_t id = render->texture_functions.id(render->texture_functions.userdata);
    lua_pushinteger(state, id);
    return 1;
}

static int api_renderparticles_texturesize(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "texturesize");
    size_t size[2];
    render->texture_functions.size(render->texture_functions.userdata, size);
    lua_pushinteger(state, size[0]);
    lua_pushinteger(state, size[1]);
    return 2;
}

static int api_renderparticles_texturecompare(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "texturecompare");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    size_t data_len;
    const void* data;
    get_binary_data(state, 4, &data, &data_len);
    const uint8_t match = render->texture_functions.compare(render->texture_functions.userdata, x, y, data_len, (const unsigned char*)data);
    lua_pushboolean(state, match);
    return 1;
}

static int api_renderparticles_texturedata(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "texturedata");
    const size_t x = luaL_checkinteger(state, 2);
    const size_t y = luaL_checkinteger(state, 3);
    const size_t len = luaL_checkinteger(state, 4);
    const uint8_t* ret = render->texture_functions.data(render->texture_functions.userdata, x, y);
    lua_pushlstring(state, (const char*)ret, len);
    return 1;
}

static int api_renderparticles_viewmatrix(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "viewmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.view_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_renderparticles_projmatrix(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "projmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.proj_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_renderparticles_inverseviewmatrix(lua_State* state) {
    const struct RenderParticles* render = require_self_userdata(state, "inverseviewmatrix");
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    render->matrix_functions.inverse_view_matrix(render->matrix_functions.userdata, transform);
    SETMETATABLE(transform)
    return 1;
}

static int api_rendericon_xywh(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "xywh");
    lua_pushinteger(state, event->target_x);
    lua_pushinteger(state, event->target_y);
    lua_pushinteger(state, event->target_w);
    lua_pushinteger(state, event->target_h);
    return 4;
}

static int api_rendericon_modelcount(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelcount");
    lua_pushinteger(state, event->icon->model_count);
    return 1;
}

static int api_rendericon_modelvertexcount(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelvertexcount");
    const size_t model = luaL_checkinteger(state, 2);
    lua_pushinteger(state, event->icon->models[model - 1].vertex_count);
    return 1;
}

static int api_rendericon_modelvertexpoint(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelvertexpoint");
    const size_t model = luaL_checkinteger(state, 2);
    const size_t vertex = luaL_checkinteger(state, 3);
    struct Point3D* point = lua_newuserdata(state, sizeof(struct Point3D));
    *point = event->icon->models[model - 1].vertices[vertex - 1].point;
    SETMETATABLE(point)
    return 1;
}

static int api_rendericon_modelvertexcolour(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelvertexcolour");
    const size_t model = luaL_checkinteger(state, 2);
    const size_t vertex = luaL_checkinteger(state, 3);
    for (size_t i = 0; i < 4; i += 1) {
        lua_pushnumber(state, event->icon->models[model - 1].vertices[vertex - 1].rgba[i]);
    }
    return 4;
}

static int api_rendericon_colour(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "colour");
    for (size_t i = 0; i < 4; i += 1) {
        lua_pushnumber(state, event->rgba[i]);
    }
    return 4;
}

static int api_rendericon_targetsize(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "targetsize");
    lua_pushinteger(state, event->screen_width);
    lua_pushinteger(state, event->screen_height);
    return 2;
}

static int api_rendericon_modelmodelmatrix(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelmodelmatrix");
    const size_t model = luaL_checkinteger(state, 2);
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    *transform = event->icon->models[model - 1].model_matrix;
    SETMETATABLE(transform)
    return 1;
}

static int api_rendericon_modelviewmatrix(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelviewmatrix");
    const size_t model = luaL_checkinteger(state, 2);
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    *transform = event->icon->models[model - 1].view_matrix;
    SETMETATABLE(transform)
    return 1;
}

static int api_rendericon_modelprojectionmatrix(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelprojectionmatrix");
    const size_t model = luaL_checkinteger(state, 2);
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    *transform = event->icon->models[model - 1].projection_matrix;
    SETMETATABLE(transform)
    return 1;
}

static int api_rendericon_modelviewprojmatrix(lua_State* state) {
    const struct RenderIconEvent* event = require_self_userdata(state, "modelviewprojmatrix");
    const size_t model = luaL_checkinteger(state, 2);
    struct Transform3D* transform = lua_newuserdata(state, sizeof(struct Transform3D));
    *transform = event->icon->models[model - 1].viewproj_matrix;
    SETMETATABLE(transform)
    return 1;
}

static int api_repositionevent_xywh(lua_State* state) {
    const struct RepositionEvent* event = require_self_userdata(state, "xywh");
    lua_pushinteger(state, event->x);
    lua_pushinteger(state, event->y);
    lua_pushinteger(state, event->width);
    lua_pushinteger(state, event->height);
    return 4;
}

static int api_repositionevent_didresize(lua_State* state) {
    const struct RepositionEvent* event = require_self_userdata(state, "didresize");
    lua_pushboolean(state, event->did_resize);
    return 1;
}

static int api_mouseevent_xy(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "xy");
    lua_pushinteger(state, event->x);
    lua_pushinteger(state, event->y);
    return 2;
}

static int api_mouseevent_ctrl(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "ctrl");
    lua_pushboolean(state, event->ctrl);
    return 1;
}

static int api_mouseevent_shift(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "shift");
    lua_pushboolean(state, event->shift);
    return 1;
}

static int api_mouseevent_meta(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "meta");
    lua_pushboolean(state, event->meta);
    return 1;
}

static int api_mouseevent_alt(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "meta");
    lua_pushboolean(state, event->alt);
    return 1;
}

static int api_mouseevent_capslock(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "capslock");
    lua_pushboolean(state, event->capslock);
    return 1;
}

static int api_mouseevent_numlock(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "numlock");
    lua_pushboolean(state, event->numlock);
    return 1;
}

static int api_mouseevent_mousebuttons(lua_State* state) {
    const struct MouseEvent* event = require_self_userdata(state, "mousebuttons");
    lua_pushboolean(state, event->mb_left);
    lua_pushboolean(state, event->mb_right);
    lua_pushboolean(state, event->mb_middle);
    return 3;
}

static int api_mousebutton_button(lua_State* state) {
    const struct MouseButtonEvent* event = require_self_userdata(state, "button");
    lua_pushinteger(state, event->button);
    return 1;
}

static int api_scroll_direction(lua_State* state) {
    const struct MouseScrollEvent* event = require_self_userdata(state, "direction");
    lua_pushinteger(state, event->direction);
    return 1;
}

static int api_browser_close(lua_State* state) {
    const struct ExternalBrowser* browser = require_self_userdata(state, "close");
    if (browser->do_capture) browser->plugin->ext_browser_capture_count += 1;
    hashmap_delete(browser->plugin->external_browsers, &browser);

    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_CLOSEBROWSER_EXTERNAL;
    const struct BoltIPCCloseBrowserHeader header = { .plugin_id = browser->plugin_id, .window_id = browser->id };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));

    return 0;
}

static int api_browser_sendmessage(lua_State* state) {
    const struct ExternalBrowser* window = require_self_userdata(state, "sendmessage");
    const void* str;
    size_t len;
    get_binary_data(state, 2, &str, &len);
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    const uint64_t id = plugin->id;
    lua_pop(state, 1);

    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_PLUGINMESSAGE;
    const struct BoltIPCPluginMessageHeader header = { .plugin_id = id, .window_id = window->id, .message_size = len };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    _bolt_ipc_send(fd, str, len);
    return 0;
}

static int api_browser_enablecapture(lua_State* state) {
    struct ExternalBrowser* window = require_self_userdata(state, "enablecapture");
    if (!window->do_capture) {
        window->plugin->ext_browser_capture_count += 1;
        window->do_capture = true;
        window->capture_ready = true;
    }
    return 0;
}

static int api_browser_disablecapture(lua_State* state) {
    struct ExternalBrowser* window = require_self_userdata(state, "disablecapture");
    if (window->do_capture) window->plugin->ext_browser_capture_count -= 1;
    window->do_capture = false;
    return 0;
}

static int api_browser_showdevtools(lua_State* state) {
    struct ExternalBrowser* window = require_self_userdata(state, "showdevtools");
    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_SHOWDEVTOOLS_EXTERNAL;
    const struct BoltIPCShowDevtoolsHeader header = { .plugin_id = window->plugin_id, .window_id = window->id };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    return 0;
}

static int api_embeddedbrowser_close(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "close");
    window->is_deleted = true;

    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_CLOSEBROWSER_OSR;
    const struct BoltIPCCloseBrowserHeader header = { .plugin_id = window->plugin_id, .window_id = window->id };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));

    return 0;
}

static int api_embeddedbrowser_sendmessage(lua_State* state) {
    const struct EmbeddedWindow* window = require_self_userdata(state, "sendmessage");
    const void* str;
    size_t len;
    get_binary_data(state, 2, &str, &len);
    lua_getfield(state, LUA_REGISTRYINDEX, PLUGIN_REGISTRYNAME);
    const struct Plugin* plugin = lua_touserdata(state, -1);
    const uint64_t id = plugin->id;
    lua_pop(state, 1);

    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_OSRPLUGINMESSAGE;
    const struct BoltIPCPluginMessageHeader header = { .plugin_id = id, .window_id = window->id, .message_size = len };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    _bolt_ipc_send(fd, str, len);
    return 0;
}

static int api_embeddedbrowser_enablecapture(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "enablecapture");
    if (!window->do_capture) {
        window->do_capture = true;
        window->capture_ready = true;
    }
    return 0;
}

static int api_embeddedbrowser_disablecapture(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "disablecapture");
    if (window->do_capture) {
        window->do_capture = false;
    }
    return 0;
}

static int api_embeddedbrowser_showdevtools(lua_State* state) {
    struct EmbeddedWindow* window = require_self_userdata(state, "showdevtools");
    const enum BoltIPCMessageTypeToHost msg_type = IPC_MSG_SHOWDEVTOOLS_OSR;
    const struct BoltIPCShowDevtoolsHeader header = { .plugin_id = window->plugin_id, .window_id = window->id };
    const BoltSocketType fd = _bolt_plugin_fd();
    _bolt_ipc_send(fd, &msg_type, sizeof(msg_type));
    _bolt_ipc_send(fd, &header, sizeof(header));
    return 0;
}

DEFBUFFER(float, float32, number)
DEFBUFFER(double, float64, number)
DEFBUFFER_1BYTE(int8_t, int8, integer)
DEFBUFFER(int16_t, int16, integer)
DEFBUFFER(int32_t, int32, integer)
DEFBUFFER(int64_t, int64, integer)
DEFBUFFER_1BYTE(uint8_t, uint8, integer)
DEFBUFFER(uint16_t, uint16, integer)
DEFBUFFER(uint32_t, uint32, integer)
DEFBUFFER(uint64_t, uint64, integer)

static int api_buffer_setstring(lua_State* state) {
    struct FixedBuffer* buffer = require_self_userdata(state, "setstring");
    const long offset = luaL_checklong(state, 2);
    size_t size;
    const void* data = luaL_checklstring(state, 3, &size);
    if (offset < 0 || (offset + size) > buffer->size) {
        lua_pushfstring(state, "buffer setstring: out-of-bounds write (buffer length %lu, writing %lu bytes at %li)", buffer->size, size, offset);
        lua_error(state);
    }
    memcpy((uint8_t*)buffer->data + offset, data, size);
    return 0;
}

static int api_buffer_setbuffer(lua_State* state) {
    struct FixedBuffer* buffer = require_self_userdata(state, "setbuffer");
    const long offset = luaL_checklong(state, 2);
    const struct FixedBuffer* srcbuffer = require_userdata(state, 3, "setbuffer");
    if (offset < 0 || (offset + srcbuffer->size) > buffer->size) {
        lua_pushfstring(state, "buffer setbuffer: out-of-bounds write (buffer length %lu, writing %lu bytes at %li)", buffer->size, srcbuffer->size, offset);
        lua_error(state);
    }
    memcpy((uint8_t*)buffer->data + offset, srcbuffer->data, srcbuffer->size);
    return 0;
}

static int api_shaderprogram_setattribute(lua_State* state) {
    struct ShaderProgramFunctions* program = require_self_userdata(state, "setattribute");
    const lua_Integer attribute = luaL_checkinteger(state, 2);
    if (attribute < 0 || attribute >= MAX_PROGRAM_BINDINGS) {
        lua_pushfstring(state, "setattribute: invalid attribute %li - must be positive and less than %i", attribute, MAX_PROGRAM_BINDINGS);
        lua_error(state);
    }
    const uint8_t width = luaL_checkinteger(state, 3);
    const uint8_t is_signed = lua_toboolean(state, 4);
    const uint8_t is_float = lua_toboolean(state, 5);
    const uint8_t size = luaL_checkinteger(state, 6);
    const lua_Integer offset = luaL_checkinteger(state, 7);
    const lua_Integer stride = luaL_checkinteger(state, 8);
    if (!program->set_attribute(program->userdata, (uint8_t)attribute, width, is_signed, is_float, size, (uint32_t)offset, (uint32_t)stride)) {
        lua_pushfstring(state, "setattribute: invalid arguments or attribute is already enabled", attribute, MAX_PROGRAM_BINDINGS);
        lua_error(state);
    }
    return 0;
}

#define DEFSETUNIFORM(N) \
static int api_shaderprogram_setuniform##N##i(lua_State* state) { \
    struct ShaderProgramFunctions* program = require_self_userdata(state, "setuniform" #N "i"); \
    const lua_Integer location = luaL_checkinteger(state, 2); \
    int values[N]; \
    for (size_t i = 0; i < N; i += 1) { \
        values[i] = (int)luaL_checkinteger(state, i + 3); \
    } \
    program->set_uniform_ints(program->userdata, location, N, values); \
    return 0; \
} \
static int api_shaderprogram_setuniform##N##f(lua_State* state) { \
    struct ShaderProgramFunctions* program = require_self_userdata(state, "setuniform" #N "f"); \
    const lua_Integer location = luaL_checkinteger(state, 2); \
    double values[N]; \
    for (size_t i = 0; i < N; i += 1) { \
        values[i] = (double)luaL_checknumber(state, i + 3); \
    } \
    program->set_uniform_floats(program->userdata, location, N, values); \
    return 0; \
}

DEFSETUNIFORM(1)
DEFSETUNIFORM(2)
DEFSETUNIFORM(3)
DEFSETUNIFORM(4)
#undef DEFSETUNIFORM

#define DEFSETUNIFORMMATRIX(N) \
static int api_shaderprogram_setuniformmatrix##N##f(lua_State* state) { \
    struct ShaderProgramFunctions* program = require_self_userdata(state, "setuniformmatrix" #N "f"); \
    const lua_Integer location = luaL_checkinteger(state, 2); \
    const uint8_t transpose = lua_toboolean(state, 3); \
    double values[N * N]; \
    for (size_t i = 0; i < (N * N); i += 1) { \
        values[i] = (double)luaL_checknumber(state, i + 4); \
    } \
    program->set_uniform_matrix(program->userdata, location, transpose, N, values); \
    return 0; \
}

DEFSETUNIFORMMATRIX(2)
DEFSETUNIFORMMATRIX(3)
DEFSETUNIFORMMATRIX(4)
#undef DEFSETUNIFORMMATRIX

static int api_shaderprogram_setuniformsurface(lua_State* state) {
    struct ShaderProgramFunctions* program = require_self_userdata(state, "setuniformsurface");
    const lua_Integer location = luaL_checkinteger(state, 2);
    const struct SurfaceFunctions* surface = require_userdata(state, 3, "setuniformsurface");
    program->set_uniform_surface(program->userdata, location, surface->userdata);
    return 0;
}

static int api_shaderprogram_drawtosurface(lua_State* state) {
    const struct ShaderProgramFunctions* program = require_self_userdata(state, "drawtosurface");
    const struct SurfaceFunctions* surface = require_userdata(state, 2, "drawtosurface");
    const struct ShaderBufferFunctions* buffer = require_userdata(state, 3, "drawtosurface");
    const lua_Integer vertex_count = luaL_checkinteger(state, 4);
    if (vertex_count > UINT32_MAX) {
        lua_pushfstring(state, "drawtosurface: too many vertices: %lu, maximum is %u", vertex_count, UINT32_MAX);
        lua_error(state);
    }
    program->draw_to_surface(program->userdata, surface->userdata, buffer->userdata, vertex_count);
    return 0;
}

/* below here is API function-list builders, declared in plugin_api.h */

struct ApiFuncTemplate {
    int (*func)(lua_State*);
    const char* name;
    size_t size;
};

static void populate_table(lua_State* state, const struct ApiFuncTemplate* functions, size_t count) {
    for (size_t i = 0; i < count; i += 1) {
        const struct ApiFuncTemplate* function = &functions[i];
        lua_pushlstring(state, function->name, function->size);
        lua_pushcfunction(state, function->func);
        lua_settable(state, -3);
    }
}

static void push_metatable(lua_State* state, const struct ApiFuncTemplate* functions, size_t count) {
    lua_newtable(state);
    lua_pushliteral(state, "__index");
    lua_createtable(state, 0, count);
    populate_table(state, functions, count);
    lua_settable(state, -3);
}

static void push_metatable_with_gc(lua_State* state, const struct ApiFuncTemplate* functions, size_t count, int(*gc)(lua_State*)) {
    push_metatable(state, functions, count);
    lua_pushliteral(state, "__gc");
    lua_pushcfunction(state, gc);
    lua_settable(state, -3);
}

#define BOLTFUNC(NAME) {.func=api_##NAME, .name=#NAME, .size=sizeof #NAME - sizeof *#NAME}
static struct ApiFuncTemplate bolt_functions[] = {
    BOLTFUNC(apiversion),
    BOLTFUNC(checkversion),
    BOLTFUNC(close),
    BOLTFUNC(time),
    BOLTFUNC(datetime),
    BOLTFUNC(weekday),
    BOLTFUNC(playerposition),
    BOLTFUNC(gamewindowsize),
    BOLTFUNC(gameviewxywh),
    BOLTFUNC(flashwindow),
    BOLTFUNC(isfocused),
    BOLTFUNC(characterid),
    BOLTFUNC(loadfile),
    BOLTFUNC(loadconfig),
    BOLTFUNC(saveconfig),

    BOLTFUNC(onrender2d),
    BOLTFUNC(onrender3d),
    BOLTFUNC(onrenderparticles),
    BOLTFUNC(onrendericon),
    BOLTFUNC(onrenderbigicon),
    BOLTFUNC(onminimapterrain),
    BOLTFUNC(onminimaprender2d),
    BOLTFUNC(onrenderminimap),
    BOLTFUNC(onswapbuffers),
    BOLTFUNC(onmousemotion),
    BOLTFUNC(onmousebutton),
    BOLTFUNC(onmousebuttonup),
    BOLTFUNC(onscroll),

    BOLTFUNC(createsurface),
    BOLTFUNC(createsurfacefromrgba),
    BOLTFUNC(createsurfacefrompng),
    BOLTFUNC(createwindow),
    BOLTFUNC(createbrowser),
    BOLTFUNC(createembeddedbrowser),
    BOLTFUNC(point),
    BOLTFUNC(createbuffer),
    BOLTFUNC(createvertexshader),
    BOLTFUNC(createfragmentshader),
    BOLTFUNC(createshaderprogram),
    BOLTFUNC(createshaderbuffer),
    
    BOLTFUNC(buffergetint8),
    BOLTFUNC(buffergetint16),
    BOLTFUNC(buffergetint32),
    BOLTFUNC(buffergetint64),
    BOLTFUNC(buffergetuint8),
    BOLTFUNC(buffergetuint16),
    BOLTFUNC(buffergetuint32),
    BOLTFUNC(buffergetuint64),
    BOLTFUNC(buffergetfloat32),
    BOLTFUNC(buffergetfloat64),
};
#undef BOLTFUNC

#define BOLTFUNC(NAME, OBJECT) {.func=api_##OBJECT##_##NAME, .name=#NAME, .size=sizeof(#NAME)-sizeof(*#NAME)}
#define BOLTALIAS(REALNAME, ALIAS, OBJECT) {.func=api_##OBJECT##_##REALNAME, .name=#ALIAS, .size=sizeof(#ALIAS)-sizeof(*#ALIAS)}

static struct ApiFuncTemplate render2d_functions[] = {
    BOLTFUNC(vertexcount, batch2d),
    BOLTFUNC(verticesperimage, batch2d),
    BOLTFUNC(targetsize, batch2d),
    BOLTFUNC(vertexxy, batch2d),
    BOLTFUNC(vertexatlasdetails, batch2d),
    BOLTFUNC(vertexuv, batch2d),
    BOLTFUNC(vertexcolour, batch2d),
    BOLTFUNC(textureid, batch2d),
    BOLTFUNC(texturesize, batch2d),
    BOLTFUNC(texturecompare, batch2d),
    BOLTFUNC(texturedata, batch2d),
    BOLTALIAS(vertexcolour, vertexcolor, batch2d),
};

static struct ApiFuncTemplate render3d_functions[] = {
    BOLTFUNC(vertexcount, render3d),
    BOLTFUNC(vertexpoint, render3d),
    BOLTFUNC(modelmatrix, render3d),
    BOLTFUNC(viewmatrix, render3d),
    BOLTFUNC(projectionmatrix, render3d),
    BOLTFUNC(viewprojmatrix, render3d),
    BOLTFUNC(vertexmeta, render3d),
    BOLTFUNC(atlasxywh, render3d),
    BOLTFUNC(vertexuv, render3d),
    BOLTFUNC(vertexcolour, render3d),
    BOLTFUNC(textureid, render3d),
    BOLTFUNC(texturesize, render3d),
    BOLTFUNC(texturecompare, render3d),
    BOLTFUNC(texturedata, render3d),
    BOLTFUNC(vertexanimation, render3d),
    BOLTFUNC(animated, render3d),
    BOLTALIAS(vertexcolour, vertexcolor, render3d),
};

static struct ApiFuncTemplate renderparticles_functions[] = {
    BOLTFUNC(vertexcount, renderparticles),
    BOLTFUNC(vertexparticleorigin, renderparticles),
    BOLTFUNC(vertexworldoffset, renderparticles),
    BOLTFUNC(vertexeyeoffset, renderparticles),
    BOLTFUNC(vertexuv, renderparticles),
    BOLTFUNC(vertexcolour, renderparticles),
    BOLTFUNC(vertexmeta, renderparticles),
    BOLTFUNC(atlasxywh, renderparticles),
    BOLTFUNC(textureid, renderparticles),
    BOLTFUNC(texturesize, renderparticles),
    BOLTFUNC(texturecompare, renderparticles),
    BOLTFUNC(texturedata, renderparticles),
    BOLTFUNC(viewmatrix, renderparticles),
    BOLTFUNC(projmatrix, renderparticles),
    BOLTFUNC(inverseviewmatrix, renderparticles),
    BOLTALIAS(vertexcolour, vertexcolor, renderparticles),
};

static struct ApiFuncTemplate rendericon_functions[] = {
    BOLTFUNC(xywh, rendericon),
    BOLTFUNC(modelcount, rendericon),
    BOLTFUNC(modelvertexcount, rendericon),
    BOLTFUNC(modelvertexpoint, rendericon),
    BOLTFUNC(modelvertexcolour, rendericon),
    BOLTFUNC(modelmodelmatrix, rendericon),
    BOLTFUNC(modelviewmatrix, rendericon),
    BOLTFUNC(modelprojectionmatrix, rendericon),
    BOLTFUNC(modelviewprojmatrix, rendericon),
    BOLTALIAS(modelvertexcolour, modelvertexcolor, rendericon),
    BOLTFUNC(colour, rendericon),
    BOLTALIAS(colour, color, rendericon),
    BOLTFUNC(targetsize, rendericon),
};

static struct ApiFuncTemplate minimapterrain_functions[] = {
    BOLTFUNC(angle, minimapterrain),
    BOLTFUNC(scale, minimapterrain),
    BOLTFUNC(position, minimapterrain),
};

static struct ApiFuncTemplate renderminimap_functions[] = {
    BOLTFUNC(sourcexywh, renderminimap),
    BOLTFUNC(targetxywh, renderminimap),
    BOLTFUNC(targetsize, renderminimap),
};

static struct ApiFuncTemplate point_functions[] = {
    BOLTFUNC(transform, point),
    BOLTFUNC(get, point),
    BOLTFUNC(aspixels, point),
};

static struct ApiFuncTemplate transform_functions[] = {
    BOLTFUNC(decompose, transform),
    BOLTFUNC(get, transform),
};

static struct ApiFuncTemplate buffer_functions[] = {
    BOLTFUNC(getint8, buffer),
    BOLTFUNC(getint16, buffer),
    BOLTFUNC(getint32, buffer),
    BOLTFUNC(getint64, buffer),
    BOLTFUNC(getuint8, buffer),
    BOLTFUNC(getuint16, buffer),
    BOLTFUNC(getuint32, buffer),
    BOLTFUNC(getuint64, buffer),
    BOLTFUNC(getfloat32, buffer),
    BOLTFUNC(getfloat64, buffer),
    BOLTFUNC(setint8, buffer),
    BOLTFUNC(setint16, buffer),
    BOLTFUNC(setint32, buffer),
    BOLTFUNC(setint64, buffer),
    BOLTFUNC(setuint8, buffer),
    BOLTFUNC(setuint16, buffer),
    BOLTFUNC(setuint32, buffer),
    BOLTFUNC(setuint64, buffer),
    BOLTFUNC(setfloat32, buffer),
    BOLTFUNC(setfloat64, buffer),
    BOLTFUNC(setstring, buffer),
    BOLTFUNC(setbuffer, buffer),
};

static struct ApiFuncTemplate shaderprogram_functions[] = {
    BOLTFUNC(setattribute, shaderprogram),
    BOLTFUNC(setuniform1i, shaderprogram),
    BOLTFUNC(setuniform2i, shaderprogram),
    BOLTFUNC(setuniform3i, shaderprogram),
    BOLTFUNC(setuniform4i, shaderprogram),
    BOLTFUNC(setuniform1f, shaderprogram),
    BOLTFUNC(setuniform2f, shaderprogram),
    BOLTFUNC(setuniform3f, shaderprogram),
    BOLTFUNC(setuniform4f, shaderprogram),
    BOLTFUNC(setuniformmatrix2f, shaderprogram),
    BOLTFUNC(setuniformmatrix3f, shaderprogram),
    BOLTFUNC(setuniformmatrix4f, shaderprogram),
    BOLTFUNC(setuniformsurface, shaderprogram),
    BOLTFUNC(drawtosurface, shaderprogram),
};

static struct ApiFuncTemplate surface_functions[] = {
    BOLTFUNC(clear, surface),
    BOLTFUNC(subimage, surface),
    BOLTFUNC(drawtoscreen, surface),
    BOLTFUNC(drawtosurface, surface),
    BOLTFUNC(drawtowindow, surface),
    BOLTFUNC(settint, surface),
    BOLTFUNC(setalpha, surface),
};

static struct ApiFuncTemplate window_functions[] = {
    BOLTFUNC(close, window),
    BOLTFUNC(id, window),
    BOLTFUNC(clear, window),
    BOLTFUNC(subimage, window),
    BOLTFUNC(startreposition, window),
    BOLTFUNC(cancelreposition, window),
    BOLTFUNC(xywh, window),
    BOLTFUNC(onreposition, window),
    BOLTFUNC(onmousemotion, window),
    BOLTFUNC(onmousebutton, window),
    BOLTFUNC(onmousebuttonup, window),
    BOLTFUNC(onscroll, window),
    BOLTFUNC(onmouseleave, window),
};

static struct ApiFuncTemplate browser_functions[] = {
    BOLTFUNC(close, browser),
    BOLTFUNC(sendmessage, browser),
    BOLTFUNC(enablecapture, browser),
    BOLTFUNC(disablecapture, browser),
    BOLTFUNC(showdevtools, browser),
    BOLTFUNC(oncloserequest, browser),
    BOLTFUNC(onmessage, browser),
};

static struct ApiFuncTemplate embeddedbrowser_functions[] = {
    BOLTFUNC(close, embeddedbrowser),
    BOLTFUNC(sendmessage, embeddedbrowser),
    BOLTFUNC(startreposition, window),
    BOLTFUNC(cancelreposition, window),
    BOLTFUNC(xywh, window),
    BOLTFUNC(enablecapture, embeddedbrowser),
    BOLTFUNC(disablecapture, embeddedbrowser),
    BOLTFUNC(showdevtools, embeddedbrowser),
    BOLTFUNC(oncloserequest, browser),
    BOLTFUNC(onmessage, browser),
    BOLTFUNC(onreposition, browser),
    BOLTFUNC(onmousemotion, browser),
    BOLTFUNC(onmousebutton, browser),
    BOLTFUNC(onmousebuttonup, browser),
    BOLTFUNC(onscroll, browser),
    BOLTFUNC(onmouseleave, browser),
};

static struct ApiFuncTemplate reposition_functions[] = {
    BOLTFUNC(xywh, repositionevent),
    BOLTFUNC(didresize, repositionevent)
};

static struct ApiFuncTemplate mousemotion_functions[] = {
    BOLTFUNC(xy, mouseevent),
    BOLTFUNC(ctrl, mouseevent),
    BOLTFUNC(shift, mouseevent),
    BOLTFUNC(meta, mouseevent),
    BOLTFUNC(alt, mouseevent),
    BOLTFUNC(capslock, mouseevent),
    BOLTFUNC(numlock, mouseevent),
    BOLTFUNC(mousebuttons, mouseevent),
};

static struct ApiFuncTemplate mousebutton_functions[] = {
    BOLTFUNC(xy, mouseevent),
    BOLTFUNC(ctrl, mouseevent),
    BOLTFUNC(shift, mouseevent),
    BOLTFUNC(meta, mouseevent),
    BOLTFUNC(alt, mouseevent),
    BOLTFUNC(capslock, mouseevent),
    BOLTFUNC(numlock, mouseevent),
    BOLTFUNC(mousebuttons, mouseevent),
    BOLTFUNC(button, mousebutton),
};

static struct ApiFuncTemplate scroll_functions[] = {
    BOLTFUNC(xy, mouseevent),
    BOLTFUNC(ctrl, mouseevent),
    BOLTFUNC(shift, mouseevent),
    BOLTFUNC(meta, mouseevent),
    BOLTFUNC(alt, mouseevent),
    BOLTFUNC(capslock, mouseevent),
    BOLTFUNC(numlock, mouseevent),
    BOLTFUNC(mousebuttons, mouseevent),
    BOLTFUNC(direction, scroll),
};

static struct ApiFuncTemplate mouseleave_functions[] = {
    BOLTFUNC(xy, mouseevent),
    BOLTFUNC(ctrl, mouseevent),
    BOLTFUNC(shift, mouseevent),
    BOLTFUNC(meta, mouseevent),
    BOLTFUNC(alt, mouseevent),
    BOLTFUNC(capslock, mouseevent),
    BOLTFUNC(numlock, mouseevent),
    BOLTFUNC(mousebuttons, mouseevent),
};

#undef BOLTFUNC
#undef BOLTALIAS

void _bolt_api_push_bolt_table(lua_State* state) {
    const size_t count = sizeof bolt_functions / sizeof *bolt_functions;
    lua_createtable(state, 0, count);
    populate_table(state, bolt_functions, count);
}

#define DEFPUSHMETA(NAME) \
void _bolt_api_push_metatable_##NAME(lua_State* state) { \
    push_metatable(state, NAME##_functions, sizeof NAME##_functions / sizeof *NAME##_functions); \
}
#define DEFPUSHMETAGC(NAME) \
void _bolt_api_push_metatable_##NAME(lua_State* state) { \
    push_metatable_with_gc(state, NAME##_functions, sizeof NAME##_functions / sizeof *NAME##_functions, NAME##_gc); \
}
#define DEFPUSHEMPTYMETA(NAME) \
void _bolt_api_push_metatable_##NAME(lua_State* state) { \
    push_metatable(state, NULL, 0); \
}
#define DEFPUSHEMPTYMETAGC(NAME) \
void _bolt_api_push_metatable_##NAME(lua_State* state) { \
    push_metatable_with_gc(state, NULL, 0, NAME##_gc); \
}

DEFPUSHMETA(render2d)
DEFPUSHMETA(render3d)
DEFPUSHMETA(renderparticles)
DEFPUSHMETA(rendericon)
DEFPUSHMETA(minimapterrain)
DEFPUSHMETA(renderminimap)
DEFPUSHMETA(point)
DEFPUSHMETA(transform)
DEFPUSHMETAGC(buffer)
DEFPUSHEMPTYMETA(swapbuffers)
DEFPUSHMETAGC(surface)
DEFPUSHEMPTYMETAGC(shader)
DEFPUSHMETAGC(shaderprogram)
DEFPUSHEMPTYMETAGC(shaderbuffer)
DEFPUSHMETA(window)
DEFPUSHMETA(browser)
DEFPUSHMETA(embeddedbrowser)
DEFPUSHMETA(reposition)
DEFPUSHMETA(mousemotion)
DEFPUSHMETA(mousebutton)
DEFPUSHMETA(scroll)
DEFPUSHMETA(mouseleave)