main.cpp

#include <QClipboard>
#include <QColor>
#include <QFontDatabase>
#include <QKeyEvent>
#include <QtGui/QGuiApplication>

#include <iostream>

#include <zlib.h>
#include "main.h"
#include "pobwindow.hpp"
#include "subscript.hpp"

lua_State *L;

int dscount;

POBWindow *pobwindow;

QRegularExpression colourCodes{R"((\^x.{6})|(\^\d))"};

void pushCallback(const char* name) {
    lua_getfield(L, LUA_REGISTRYINDEX, "uicallbacks");
    lua_getfield(L, -1, "MainObject");
    lua_remove(L, -2);
    lua_getfield(L, -1, name);
    lua_insert(L, -2);
}

void POBWindow::triggerUpdate() {
    if (isActive()) {
        update();
    }
}

void POBWindow::initializeGL() {
    QImage wimg{1, 1, QImage::Format_Mono};
    wimg.fill(1);
    white.reset(new QOpenGLTexture(wimg));
    glClearColor(0.0, 0.0, 0.0, 1.0);
    glEnable(GL_TEXTURE_2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
//    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
//    glDisable(GL_LIGHTING);
    glDepthMask(GL_FALSE);
    glDisable(GL_DEPTH_TEST);
    glDisable(GL_ALPHA_TEST);
//    glAlphaFunc(GL_GREATER, 0);
    glEnable(GL_BLEND);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}

void POBWindow::resizeGL(int w, int h) {
    width = w;
    height = h;
}

void POBWindow::paintGL() {
    isDrawing = true;
    glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
    glColor4f(0, 0, 0, 0);

    for (auto& layer : layers) {
        layer.second.clear();
    }
    dscount = 0;
    curLayer = 0;
    curSubLayer = 0;

    pushCallback("OnFrame");
    int result = lua_pcall(L, 1, 0, 0);
    if (result != 0) {
        lua_error(L);
    }

    if (dscount > pobwindow->stringCache.maxCost()) {
        pobwindow->stringCache.setMaxCost(dscount);
    }

    for (auto& layer : layers) {
        for (auto& cmd : layer.second) {
            cmd->execute();
        }
    }
    isDrawing = false;
}

void POBWindow::subScriptFinished() {
    bool clean = true;
    for (int i = 0;i < subScriptList.size();i++) {
        if (subScriptList[i].get()) {
            clean = false;
            if (subScriptList[i]->isFinished()) {
                subScriptList[i]->onSubFinished(L, i);
                subScriptList[i].reset();
            }
        }
    }
    if (clean) {
        subScriptList.clear();
    }
}

void POBWindow::mouseMoveEvent(QMouseEvent *event) {
    update();
}

void pushMouseString(QMouseEvent *event) {
    switch (event->button()) {
    case Qt::LeftButton:
        lua_pushstring(L, "LEFTBUTTON");
        break;
    case Qt::RightButton:
        lua_pushstring(L, "RIGHTBUTTON");
        break;
    case Qt::MiddleButton:
        lua_pushstring(L, "MIDDLEBUTTON");
        break;
    default:
        std::cout << "MOUSE STRING? " << event->button() << std::endl;
    }
}

void POBWindow::mousePressEvent(QMouseEvent *event) {
    pushCallback("OnKeyDown");
    pushMouseString(event);
    lua_pushboolean(L, false);
    int result = lua_pcall(L, 3, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

void POBWindow::mouseReleaseEvent(QMouseEvent *event) {
    pushCallback("OnKeyUp");
    pushMouseString(event);
    int result = lua_pcall(L, 2, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

void POBWindow::mouseDoubleClickEvent(QMouseEvent *event) {
    pushCallback("OnKeyDown");
    pushMouseString(event);
    lua_pushboolean(L, true);
    int result = lua_pcall(L, 3, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

void POBWindow::wheelEvent(QWheelEvent *event) {
    pushCallback("OnKeyUp");
    if (event->angleDelta().y() > 0) {
        lua_pushstring(L, "WHEELUP");
    } else if (event->angleDelta().y() < 0) {
        lua_pushstring(L, "WHEELDOWN");
    } else {
        return;
    }
    lua_pushboolean(L, false);
    int result = lua_pcall(L, 3, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

bool pushKeyString(int keycode) {
    switch (keycode) {
    case Qt::Key_Escape:
        lua_pushstring(L, "ESCAPE");
        break;
    case Qt::Key_Tab:
        lua_pushstring(L, "TAB");
        break;
    case Qt::Key_Return:
    case Qt::Key_Enter:
        lua_pushstring(L, "RETURN");
        break;
    case Qt::Key_Backspace:
        lua_pushstring(L, "BACK");
        break;
    case Qt::Key_Delete:
        lua_pushstring(L, "DELETE");
        break;
    case Qt::Key_Home:
        lua_pushstring(L, "HOME");
        break;
    case Qt::Key_End:
        lua_pushstring(L, "END");
        break;
    case Qt::Key_Up:
        lua_pushstring(L, "UP");
        break;
    case Qt::Key_Down:
        lua_pushstring(L, "DOWN");
        break;
    case Qt::Key_Left:
        lua_pushstring(L, "LEFT");
        break;
    case Qt::Key_Right:
        lua_pushstring(L, "RIGHT");
        break;
    case Qt::Key_PageUp:
        lua_pushstring(L, "PAGEUP");
        break;
    case Qt::Key_PageDown:
        lua_pushstring(L, "PAGEDOWN");
        break;
    case Qt::Key_F6:
        lua_pushstring(L, "F6");
        break;
    default:
        return false;
    }
    return true;
}

void POBWindow::keyPressEvent(QKeyEvent *event) {
    pushCallback("OnKeyDown");
    if (!pushKeyString(event->key())) {
        if (event->key() >= ' ' && event->key() <= '~') {
            char s[2];
            if (event->key() >= 'A' && event->key() <= 'Z' && !(QGuiApplication::keyboardModifiers() & Qt::ShiftModifier)) {
                s[0] = event->key() + 32;
            } else {
                s[0] = event->key();
            }
            s[1] = 0;
            if (!(QGuiApplication::keyboardModifiers() & Qt::ControlModifier)) {
                lua_pop(L, 2);
                pushCallback("OnChar");
            }
            lua_pushstring(L, s);
        } else {
            lua_pushstring(L, "ASDF");
            //std::cout << "UNHANDLED KEYDOWN" << std::endl;
        }
    }
    lua_pushboolean(L, false);
    int result = lua_pcall(L, 3, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

void POBWindow::keyReleaseEvent(QKeyEvent *event) {
    pushCallback("OnKeyUp");
    if (!pushKeyString(event->key())) {
        lua_pushstring(L, "ASDF");
        //std::cout << "UNHANDLED KEYUP" << std::endl;
    }
    int result = lua_pcall(L, 2, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
}

void POBWindow::LAssert(lua_State* L, int cond, const char* fmt, ...) {
    if ( !cond ) {
        va_list va;
        va_start(va, fmt);
        lua_pushvfstring(L, fmt, va);
        va_end(va);
        lua_error(L);
    }
}

int POBWindow::IsUserData(lua_State* L, int index, const char* metaName)
{
    if (lua_type(L, index) != LUA_TUSERDATA || lua_getmetatable(L, index) == 0) {
        return 0;
    }
    lua_getfield(L, LUA_REGISTRYINDEX, metaName);
    int ret = lua_rawequal(L, -2, -1);
    lua_pop(L, 2);
    return ret;
}

void POBWindow::SetDrawLayer(int layer) {
    SetDrawLayer(layer, 0);
}

void POBWindow::SetDrawLayer(int layer, int subLayer) {
    if (layer == curLayer && subLayer == curSubLayer) {
        return;
    }

    curLayer = layer;
    curSubLayer = subLayer;
}


void POBWindow::AppendCmd(std::unique_ptr<Cmd> cmd) {
    layers[{curLayer, curSubLayer}].emplace_back(std::move(cmd));
}

void POBWindow::DrawColor(const float col[4]) {
    if (col) {
        drawColor[0] = col[0];
        drawColor[1] = col[1];
        drawColor[2] = col[2];
        drawColor[3] = col[3];
    } else {
        drawColor[0] = 1.0f;
        drawColor[1] = 1.0f;
        drawColor[2] = 1.0f;
        drawColor[3] = 1.0f;
    }
    AppendCmd(std::make_unique<ColorCmd>(drawColor));
}

void POBWindow::DrawColor(uint32_t col) {
    drawColor[0] = ((col >> 16) & 0xFF) / 255.0f;
    drawColor[1] = ((col >> 8) & 0xFF) / 255.0f;
    drawColor[2] = (col & 0xFF) / 255.0f;
    drawColor[3] = (col >> 24) / 255.0f;
}


// Color escape table
static const float colorEscape[10][4] = {
    {0.0f, 0.0f, 0.0f, 1.0f},
    {1.0f, 0.0f, 0.0f, 1.0f},
    {0.0f, 1.0f, 0.0f, 1.0f},
    {0.0f, 0.0f, 1.0f, 1.0f},
    {1.0f, 1.0f, 0.0f, 1.0f},
    {1.0f, 0.0f, 1.0f, 1.0f},
    {0.0f, 1.0f, 1.0f, 1.0f},
    {1.0f, 1.0f, 1.0f, 1.0f},
    {0.7f, 0.7f, 0.7f, 1.0f},
    {0.4f, 0.4f, 0.4f, 1.0f}
};

int IsColorEscape(const char* str)
{
    if (str[0] != '^') {
        return 0;
    }
    if (isdigit(str[1])) {
        return 2;
    } else if (str[1] == 'x' || str[1] == 'X') {
        for (int c = 0; c < 6; c++) {
            if ( !isxdigit(str[c + 2]) ) {
                return 0;
            }
        }
        return 8;
    }
    return 0;
}

void ReadColorEscape(const char* str, float* out)
{
    int len = IsColorEscape(str);
    switch (len) {
    case 2:
        out[0] = colorEscape[str[1] - '0'][0];
        out[1] = colorEscape[str[1] - '0'][1];
        out[2] = colorEscape[str[1] - '0'][2];
        break;
    case 8:
    {
        int xr, xg, xb;
        sscanf(str + 2, "%2x%2x%2x", &xr, &xg, &xb);
        out[0] = xr / 255.0f;
        out[1] = xg / 255.0f;
        out[2] = xb / 255.0f;
    }
    break;
    }
}

// =========
// Callbacks
// =========

static int l_SetCallback(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetCallback(name[, func])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "SetCallback() argument 1: expected string, got %t", 1);
    lua_pushvalue(L, 1);
    if (n >= 2) {
        pobwindow->LAssert(L, lua_isfunction(L, 2) || lua_isnil(L, 2), "SetCallback() argument 2: expected function or nil, got %t", 2);
        lua_pushvalue(L, 2);
    } else {
        lua_pushnil(L);
    }
    lua_settable(L, lua_upvalueindex(1));
    return 0;
}

static int l_GetCallback(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: GetCallback(name)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "GetCallback() argument 1: expected string, got %t", 1);
    lua_pushvalue(L, 1);
    lua_gettable(L, lua_upvalueindex(1));
    return 1;
}

static int l_SetMainObject(lua_State* L)
{
    int n = lua_gettop(L);
    lua_pushstring(L, "MainObject");
    if (n >= 1) {
        pobwindow->LAssert(L, lua_istable(L, 1) || lua_isnil(L, 1), "SetMainObject() argument 1: expected table or nil, got %t", 1);
        lua_pushvalue(L, 1);
    } else {
        lua_pushnil(L);
    }
    lua_settable(L, lua_upvalueindex(1));
    return 0;
}

// =============
// Image Handles
// =============

struct imgHandle_s {
    std::shared_ptr<QOpenGLTexture> *hnd;
    QImage* img;
};

static int l_NewImageHandle(lua_State* L)
{
    auto imgHandle = (imgHandle_s*)lua_newuserdata(L, sizeof(imgHandle_s));
    imgHandle->hnd = nullptr;
    imgHandle->img = nullptr;
    lua_pushvalue(L, lua_upvalueindex(1));
    lua_setmetatable(L, -2);
    return 1;
}

static imgHandle_s* GetImgHandle(lua_State* L, const char* method, bool loaded)
{
    pobwindow->LAssert(L, pobwindow->IsUserData(L, 1, "uiimghandlemeta"), "imgHandle:%s() must be used on an image handle", method);
    auto imgHandle = (imgHandle_s*)lua_touserdata(L, 1);
    lua_remove(L, 1);
    if (loaded) {
        //pobwindow->LAssert(L, imgHandle->hnd != NULL, "imgHandle:%s(): image handle has no image loaded", method);
    }
    return imgHandle;
}

static int l_imgHandleGC(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "__gc", false);
    delete imgHandle->hnd;
    delete imgHandle->img;
    return 0;
}

static int l_imgHandleLoad(lua_State* L) 
{
    imgHandle_s* imgHandle = GetImgHandle(L, "Load", false);
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: imgHandle:Load(fileName[, flag1[, flag2...]])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "imgHandle:Load() argument 1: expected string, got %t", 1);
    QString fileName = lua_tostring(L, 1);
    QString fullFileName;
    if (fileName.contains(':') || pobwindow->scriptWorkDir.isEmpty()) {
        fullFileName = fileName;
    } else {
        fullFileName = pobwindow->scriptWorkDir + QDir::separator() + fileName;
    }

    delete imgHandle->hnd;
    imgHandle->hnd = new std::shared_ptr<QOpenGLTexture>();
    delete imgHandle->img;
    int flags = TF_NOMIPMAP;
    for (int f = 2; f <= n; f++) {
        if ( !lua_isstring(L, f) ) {
            continue;
        }
        const char* flag = lua_tostring(L, f);
        if ( !strcmp(flag, "ASYNC") ) {
            flags|= TF_ASYNC;
        } else if ( !strcmp(flag, "CLAMP") ) {
            flags|= TF_CLAMP;
        } else if ( !strcmp(flag, "MIPMAP") ) {
            flags&= ~TF_NOMIPMAP;
        } else {
            pobwindow->LAssert(L, 0, "imgHandle:Load(): unrecognised flag '%s'", flag);
        }
    }
    imgHandle->img = new QImage();
    imgHandle->img->load(fullFileName);
    imgHandle->img->setText("fname", fullFileName);
    //imgHandle->hnd = new QOpenGLTexture(img);
    //pobwindow->renderer->RegisterShader(fullFileName, flags);
    return 0;
}

static int l_imgHandleUnload(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "Unload", false);
    delete imgHandle->hnd;
    imgHandle->hnd = nullptr;
    delete imgHandle->img;
    imgHandle->img = nullptr;
    return 0;
}

static int l_imgHandleIsValid(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "IsValid", false);
    lua_pushboolean(L, imgHandle->hnd != nullptr);
    return 1;
}

static int l_imgHandleIsLoading(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "IsLoading", true);
//	int width, height;
//	pobwindow->renderer->GetShaderImageSize(imgHandle->hnd, width, height);
    lua_pushboolean(L, false);
    return 1;
}

static int l_imgHandleSetLoadingPriority(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "SetLoadingPriority", true);
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: imgHandle:SetLoadingPriority(pri)");
    pobwindow->LAssert(L, lua_isnumber(L, 1), "imgHandle:SetLoadingPriority() argument 1: expected number, got %t", 1);
    //pobwindow->renderer->SetShaderLoadingPriority(imgHandle->hnd, (int)lua_tointeger(L, 1));
    return 0;
}

static int l_imgHandleImageSize(lua_State* L)
{
    imgHandle_s* imgHandle = GetImgHandle(L, "ImageSize", true);
    QSize size(imgHandle->img->size());
    lua_pushinteger(L, size.width());
    lua_pushinteger(L, size.height());
    return 2;
}

// =========
// Rendering
// =========

static int l_RenderInit(lua_State* L)
{
    return 0;
}

static int l_GetScreenSize(lua_State* L)
{
    lua_pushinteger(L, pobwindow->width);
    lua_pushinteger(L, pobwindow->height);
    return 2;
}

static int l_SetClearColor(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 3, "Usage: SetClearColor(red, green, blue[, alpha])");
    float color[4];
    for (int i = 1; i <= 3; i++) {
        pobwindow->LAssert(L, lua_isnumber(L, i), "SetClearColor() argument %d: expected number, got %t", i, i);
        color[i-1] = (float)lua_tonumber(L, i);
    }
    if (n >= 4 && !lua_isnil(L, 4)) {
        pobwindow->LAssert(L, lua_isnumber(L, 4), "SetClearColor() argument 4: expected number or nil, got %t", 4);
        color[3] = (float)lua_tonumber(L, 4);
    } else {
        color[3] = 1.0;
    }
    glClearColor(color[0], color[1], color[2], color[3]);
    return 0;
}

static int l_SetDrawLayer(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetDrawLayer({layer|nil}[, subLayer])");
    pobwindow->LAssert(L, lua_isnumber(L, 1) || lua_isnil(L, 1), "SetDrawLayer() argument 1: expected number or nil, got %t", 1);
    if (n >= 2) {
        pobwindow->LAssert(L, lua_isnumber(L, 2), "SetDrawLayer() argument 2: expected number, got %t", 2);
    }
    if (lua_isnil(L, 1)) {
        pobwindow->LAssert(L, n >= 2, "SetDrawLayer(): must provide subLayer if layer is nil");
        pobwindow->SetDrawSubLayer(lua_tointeger(L, 2));
    } else if (n >= 2) {
        pobwindow->SetDrawLayer(lua_tointeger(L, 1), lua_tointeger(L, 2));
    } else {
        pobwindow->SetDrawLayer(lua_tointeger(L, 1));
    }
    return 0;
}

void ViewportCmd::execute() {
    glViewport(x, pobwindow->height - y - h, w, h);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0, (float)w, (float)h, 0, -9999, 9999);
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
}

static int l_SetViewport(lua_State* L)
{
    int n = lua_gettop(L);
    if (n) {
        pobwindow->LAssert(L, n >= 4, "Usage: SetViewport([x, y, width, height])");
        for (int i = 1; i <= 4; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "SetViewport() argument %d: expected number, got %t", i, i);
        }
        pobwindow->AppendCmd(std::make_unique<ViewportCmd>((int)lua_tointeger(L, 1), (int)lua_tointeger(L, 2), (int)lua_tointeger(L, 3), (int)lua_tointeger(L, 4)));
    } else {
        pobwindow->AppendCmd(std::make_unique<ViewportCmd>(0, 0, pobwindow->width, pobwindow->height));
    }
    return 0;
}

static int l_SetDrawColor(lua_State* L)
{
    pobwindow->LAssert(L, pobwindow->isDrawing, "SetDrawColor() called outside of OnFrame");
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetDrawColor(red, green, blue[, alpha]) or SetDrawColor(escapeStr)");
    float color[4];
    if (lua_type(L, 1) == LUA_TSTRING) {
        pobwindow->LAssert(L, IsColorEscape(lua_tostring(L, 1)), "SetDrawColor() argument 1: invalid color escape sequence");
        ReadColorEscape(lua_tostring(L, 1), color);
        color[3] = 1.0;
    } else {
        pobwindow->LAssert(L, n >= 3, "Usage: SetDrawColor(red, green, blue[, alpha]) or SetDrawColor(escapeStr)");
        for (int i = 1; i <= 3; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "SetDrawColor() argument %d: expected number, got %t", i, i);
            color[i-1] = (float)lua_tonumber(L, i);
        }
        if (n >= 4 && !lua_isnil(L, 4)) {
            pobwindow->LAssert(L, lua_isnumber(L, 4), "SetDrawColor() argument 4: expected number or nil, got %t", 4);
            color[3] = (float)lua_tonumber(L, 4);
        } else {
            color[3] = 1.0;
        }
    }
    pobwindow->DrawColor(color);
    return 0;
}

static int l_DrawImage(lua_State* L)
{
    pobwindow->LAssert(L, pobwindow->isDrawing, "DrawImage() called outside of OnFrame");
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 5, "Usage: DrawImage({imgHandle|nil}, left, top, width, height[, tcLeft, tcTop, tcRight, tcBottom])");
    pobwindow->LAssert(L, lua_isnil(L, 1) || pobwindow->IsUserData(L, 1, "uiimghandlemeta"), "DrawImage() argument 1: expected image handle or nil, got %t", 1);
    std::shared_ptr<QOpenGLTexture> hnd;
    if ( !lua_isnil(L, 1) ) {
        auto imgHandle = (imgHandle_s*)lua_touserdata(L, 1);
        if (imgHandle->hnd->get() == nullptr) {
            imgHandle->hnd->reset(new QOpenGLTexture(*(imgHandle->img)));
            if (!(*imgHandle->hnd)->isCreated()) {
                //std::cout << "BROKEN TEXTURE " << imgHandle->img->text("fname").toStdString() << std::endl;
                *imgHandle->hnd = pobwindow->white;
            }
        }
        pobwindow->LAssert(L, imgHandle->hnd != nullptr, "DrawImage(): image handle has no image loaded");
        hnd = *imgHandle->hnd;
    }
    float arg[8];
    if (n > 5) {
        pobwindow->LAssert(L, n >= 9, "DrawImage(): incomplete set of texture coordinates provided");
        for (int i = 2; i <= 9; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "DrawImage() argument %d: expected number, got %t", i, i);
            arg[i-2] = (float)lua_tonumber(L, i);
        }
        pobwindow->AppendCmd(std::make_unique<DrawImageCmd>(hnd, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6], arg[7]));
    } else {
        for (int i = 2; i <= 5; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "DrawImage() argument %d: expected number, got %t", i, i);
            arg[i-2] = (float)lua_tonumber(L, i);
        }
        pobwindow->AppendCmd(std::make_unique<DrawImageCmd>(hnd, arg[0], arg[1], arg[2], arg[3]));
    }
    return 0;
}

void DrawImageQuadCmd::execute() {
    if (tex != nullptr && tex->isCreated()) {
        tex->bind();
    } else {
        pobwindow->white->bind();
    }
    glBegin(GL_TRIANGLE_FAN);
    for (int v = 0; v < 4; v++) {
        glTexCoord2d(s[v], t[v]);
        glVertex2d(x[v], y[v]);
    }
    glEnd();
}

static int l_DrawImageQuad(lua_State* L)
{
    pobwindow->LAssert(L, pobwindow->isDrawing, "DrawImageQuad() called outside of OnFrame");
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 9, "Usage: DrawImageQuad({imgHandle|nil}, x1, y1, x2, y2, x3, y3, x4, y4[, s1, t1, s2, t2, s3, t3, s4, t4])");
    pobwindow->LAssert(L, lua_isnil(L, 1) || pobwindow->IsUserData(L, 1, "uiimghandlemeta"), "DrawImageQuad() argument 1: expected image handle or nil, got %t", 1);
    std::shared_ptr<QOpenGLTexture> hnd;
    if ( !lua_isnil(L, 1) ) {
        auto imgHandle = (imgHandle_s*)lua_touserdata(L, 1);
        if ((*imgHandle->hnd).get() == nullptr) {
            (*imgHandle->hnd).reset(new QOpenGLTexture(*(imgHandle->img)));
            if (!(*imgHandle->hnd)->isCreated()) {
                // std::cout << "BROKEN TEXTURE" << imgHandle->img->text("fname").toStdString() << std::endl;
                *imgHandle->hnd = pobwindow->white;
            }
        }
        pobwindow->LAssert(L, imgHandle->hnd != nullptr, "DrawImageQuad(): image handle has no image loaded");
        hnd = *imgHandle->hnd;
    }
    float arg[16];
    if (n > 9) {
        pobwindow->LAssert(L, n >= 17, "DrawImageQuad(): incomplete set of texture coordinates provided");
        for (int i = 2; i <= 17; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "DrawImageQuad() argument %d: expected number, got %t", i, i);
            arg[i-2] = (float)lua_tonumber(L, i);
        }
        pobwindow->AppendCmd(std::make_unique<DrawImageQuadCmd>(hnd, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6], arg[7], arg[8], arg[9], arg[10], arg[11], arg[12], arg[13], arg[14], arg[15]));
    } else {
        for (int i = 2; i <= 9; i++) {
            pobwindow->LAssert(L, lua_isnumber(L, i), "DrawImageQuad() argument %d: expected number, got %t", i, i);
            arg[i-2] = (float)lua_tonumber(L, i);
        }
        pobwindow->AppendCmd(std::make_unique<DrawImageQuadCmd>(hnd, arg[0], arg[1], arg[2], arg[3], arg[4], arg[5], arg[6], arg[7]));
    }
    return 0;
}

DrawStringCmd::DrawStringCmd(float X, float Y, int Align, int Size, int Font, const char *Text) : text(Text) {
    dscount++;
    if (text.size() >= 2 && text[0] == '^') {
        switch(text[1].toLatin1()) {
        case '0':
            setCol(0.0f, 0.0f, 0.0f);
            break;
        case '1':
            setCol(1.0f, 0.0f, 0.0f);
            break;
        case '2':
            setCol(0.0f, 1.0f, 0.0f);
            break;
        case '3':
            setCol(0.0f, 0.0f, 1.0f);
            break;
        case '4':
            setCol(1.0f, 1.0f, 0.0f);
            break;
        case '5':
            setCol(1.0f, 0.0f, 1.0f);
            break;
        case '6':
            setCol(0.0f, 1.0f, 1.0f);
            break;
        case '7':
            setCol(1.0f, 1.0f, 1.0f);
            break;
        case '8':
            setCol(0.7f, 0.7f, 0.7f);
            break;
        case '9':
            setCol(0.4f, 0.4f, 0.4f);
            break;
        case 'x':
            int xr, xg, xb;
            sscanf(text.toStdString().c_str() + 2, "%2x%2x%2x", &xr, &xg, &xb);
            setCol(xr / 255.0f, xg / 255.0f, xb / 255.0f);
            break;
        default:
            break;
        }
    } else {
        col[3] = 0;
    }
    int count = 0;
    for (auto i = colourCodes.globalMatch(text);i.hasNext();i.next()) {
        count += 1;
    }
    if (count > 1) {
        //std::cout << text.toStdString().c_str() << " " << count << std::endl;
    }
    text.remove(colourCodes);

    QString cacheKey = (QString::number(Font) + "_" + QString::number(Size) + "_" + text);
    if (pobwindow->stringCache.contains(cacheKey)) {
        tex = *pobwindow->stringCache[cacheKey];
    } else {
        QString fontName;
        switch (Font) {
        case 1:
            fontName = "Liberation Sans";
            break;
        case 2:
            fontName = "Liberation Sans Bold";
            break;
        case 0:
        default:
            fontName = "Bitstream Vera Mono";
            break;
        }
        QFont font(fontName);
        font.setPixelSize(Size + pobwindow->fontFudge);
        QFontMetrics fm(font);
        QSize size = fm.size(0, text);

        QImage brush(size, QImage::Format_ARGB32);
        brush.fill(QColor(255, 255, 255, 0));
        tex = nullptr;
        if (brush.width() && brush.height()) {
            QPainter p(&brush);
            p.setPen(QColor(255, 255, 255, 255));
            p.setFont(font);
            p.setCompositionMode(QPainter::CompositionMode_Plus);
            p.drawText(0, 0, size.width(), size.height(), 0, text);
            p.end();
            tex.reset(new QOpenGLTexture(brush));
        }
        pobwindow->stringCache.insert(cacheKey, new std::shared_ptr<QOpenGLTexture>(tex));
    }
    int width = 0;
    int height = 0;
    if (tex.get() != nullptr) {
        width = tex->width();
        height = tex->height();
    }

    switch (Align) {
    case F_CENTRE:
        X = floor((pobwindow->width - width) / 2.0f + X);
        break;
    case F_RIGHT:
        X = floor(pobwindow->width - width - X);
        break;
    case F_CENTRE_X:
        X = floor(X - width / 2.0f);
        break;
    case F_RIGHT_X:
        X = floor(X - width) + 5;
        break;
    }
    x[0] = X;
    y[0] = Y;
    x[1] = X + width;
    y[1] = Y;
    x[2] = X + width;
    y[2] = Y + height;
    x[3] = X;
    y[3] = Y + height;

    s[0] = 0;
    t[0] = 0;
    s[1] = 1;
    t[1] = 0;
    s[2] = 1;
    t[2] = 1;
    s[3] = 0;
    t[3] = 1;
}

static int l_DrawString(lua_State* L)
{
    pobwindow->LAssert(L, pobwindow->isDrawing, "DrawString() called outside of OnFrame");
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 6, "Usage: DrawString(left, top, align, height, font, text)");
    pobwindow->LAssert(L, lua_isnumber(L, 1), "DrawString() argument 1: expected number, got %t", 1);
    pobwindow->LAssert(L, lua_isnumber(L, 2), "DrawString() argument 2: expected number, got %t", 2);
    pobwindow->LAssert(L, lua_isstring(L, 3) || lua_isnil(L, 3), "DrawString() argument 3: expected string or nil, got %t", 3);
    pobwindow->LAssert(L, lua_isnumber(L, 4), "DrawString() argument 4: expected number, got %t", 4);
    pobwindow->LAssert(L, lua_isstring(L, 5), "DrawString() argument 5: expected string, got %t", 5);
    pobwindow->LAssert(L, lua_isstring(L, 6), "DrawString() argument 6: expected string, got %t", 6);
    static const char* alignMap[6] = { "LEFT", "CENTER", "RIGHT", "CENTER_X", "RIGHT_X", nullptr };
    static const char* fontMap[4] = { "FIXED", "VAR", "VAR BOLD", nullptr };
    pobwindow->AppendCmd(std::make_unique<DrawStringCmd>(
        (float)lua_tonumber(L, 1), (float)lua_tonumber(L, 2), luaL_checkoption(L, 3, "LEFT", alignMap), 
        (int)lua_tointeger(L, 4), luaL_checkoption(L, 5, "FIXED", fontMap), lua_tostring(L, 6)
                                                  ));
    return 0;
}

static int l_DrawStringWidth(lua_State* L) 
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 3, "Usage: DrawStringWidth(height, font, text)");
    pobwindow->LAssert(L, lua_isnumber(L, 1), "DrawStringWidth() argument 1: expected number, got %t", 1);
    pobwindow->LAssert(L, lua_isstring(L, 2), "DrawStringWidth() argument 2: expected string, got %t", 2);
    pobwindow->LAssert(L, lua_isstring(L, 3), "DrawStringWidth() argument 3: expected string, got %t", 3);
    int fontsize = lua_tointeger(L, 1);
    QString fontName = lua_tostring(L, 2);
    QString fontKey = "0";
    if (fontName == "VAR") {
        fontName = "Liberation Sans";
        fontKey = "1";
    } else if (fontName == "VAR BOLD") {
        fontName = "Liberation Sans Bold";
        fontKey = "2";
    } else {
        fontName = "Bitstream Vera Mono";
    }
    QString text(lua_tostring(L, 3));

    text.remove(colourCodes);

    QString cacheKey = (fontKey + "_" + QString::number(fontsize) + "_" + text);
    if (pobwindow->stringCache.contains(cacheKey) && pobwindow->stringCache[cacheKey]->get()) {
        lua_pushinteger(L, (*pobwindow->stringCache[cacheKey])->width());
        return 1;
    }

    QFont font(fontName);
    font.setPixelSize(fontsize + pobwindow->fontFudge);
    QFontMetrics fm(font);
    lua_pushinteger(L, fm.size(0, text).width());
    return 1;
}

static int l_DrawStringCursorIndex(lua_State* L) 
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 5, "Usage: DrawStringCursorIndex(height, font, text, cursorX, cursorY)");
    pobwindow->LAssert(L, lua_isnumber(L, 1), "DrawStringCursorIndex() argument 1: expected number, got %t", 1);
    pobwindow->LAssert(L, lua_isstring(L, 2), "DrawStringCursorIndex() argument 2: expected string, got %t", 2);
    pobwindow->LAssert(L, lua_isstring(L, 3), "DrawStringCursorIndex() argument 3: expected string, got %t", 3);
    pobwindow->LAssert(L, lua_isnumber(L, 4), "DrawStringCursorIndex() argument 4: expected number, got %t", 4);
    pobwindow->LAssert(L, lua_isnumber(L, 5), "DrawStringCursorIndex() argument 5: expected number, got %t", 5);

    int fontsize = lua_tointeger(L, 1);
    QString fontName = lua_tostring(L, 2);
    if (fontName == "VAR") {
        fontName = "Liberation Sans";
    } else if (fontName == "VAR BOLD") {
        fontName = "Liberation Sans Bold";
    } else {
        fontName = "Bitstream Vera Mono";
    }
    QString text(lua_tostring(L, 3));

    text.remove(colourCodes);

    QStringList texts = text.split("\n");
    QFont font(fontName);
    font.setPixelSize(fontsize + pobwindow->fontFudge);
    QFontMetrics fm(font);
    int curX = lua_tointeger(L, 4);
    int curY = lua_tointeger(L, 5);
    int yidx = std::max(0, std::min(texts.size() - 1, curY / fm.lineSpacing()));
    text = texts[yidx];
    int i = 0;
    for (;i <= text.size();i++) {
        if (fm.size(0, text.left(i)).width() > curX) {
            break;
        }
    }
    for (int y = 0;y < yidx;y++) {
        i += texts[y].size() + 1;
    }
    lua_pushinteger(L, i);
    return 1;
}

static int l_StripEscapes(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: StripEscapes(string)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "StripEscapes() argument 1: expected string, got %t", 1);
    const char* str = lua_tostring(L, 1);
    char* strip = new char[strlen(str) + 1];
    char* p = strip;
    while (*str) {
        int esclen = IsColorEscape(str);
        if (esclen) {
            str+= esclen;
        } else {
            *(p++) = *(str++);
        }
    }
    *p = 0;
    lua_pushstring(L, strip);
    delete[] strip;
    return 1;
}

static int l_GetAsyncCount(lua_State* L)
{
//    lua_pushinteger(L, pobwindow->GetTexAsyncCount());
    lua_pushinteger(L, 0);
    return 1;
}

// ==============
// Search Handles
// ==============

struct searchHandle_s {
    QFileInfoList *fil;
};

static int l_NewFileSearch(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: NewFileSearch(spec[, findDirectories])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "NewFileSearch() argument 1: expected string, got %t", 1);
    QString search_string(lua_tostring(L, 1));
    QStringList split = search_string.split("/");
    QString wildcard = split.takeLast();
    QDir dir(split.join("/"));
    QStringList filters;
    filters << wildcard;
    bool dirOnly = lua_toboolean(L, 2) != 0;
    QFileInfoList fil = dir.entryInfoList(filters, QDir::NoDotAndDotDot | (dirOnly ? QDir::Dirs : QDir::Files));
    if (fil.isEmpty()) {
        return 0;
    }

    auto handle = (searchHandle_s*)lua_newuserdata(L, sizeof(searchHandle_s));
    handle->fil = new QFileInfoList(fil);
    lua_pushvalue(L, lua_upvalueindex(1));
    lua_setmetatable(L, -2);
    return 1;
}

static QFileInfoList* GetSearchHandle(lua_State* L, const char* method, bool valid)
{
    pobwindow->LAssert(L, pobwindow->IsUserData(L, 1, "uisearchhandlemeta"), "searchHandle:%s() must be used on a search handle", method);
    auto searchHandle = (searchHandle_s*)lua_touserdata(L, 1);
    lua_remove(L, 1);
    if (valid) {
        pobwindow->LAssert(L, !searchHandle->fil->isEmpty(), "searchHandle:%s(): search handle is no longer valid (ran out of files to find)", method);
    }
    return searchHandle->fil;
}

static int l_searchHandleGC(lua_State* L)
{
    QFileInfoList* searchHandle = GetSearchHandle(L, "__gc", false);
    delete searchHandle;
    return 0;
}

static int l_searchHandleNextFile(lua_State* L)
{
    QFileInfoList* searchHandle = GetSearchHandle(L, "NextFile", true);
    searchHandle->removeFirst();
    if ( searchHandle->isEmpty() ) {
        return 0;
    }
    lua_pushboolean(L, 1);
    return 1;
}

static int l_searchHandleGetFileName(lua_State* L)
{
    QFileInfoList* searchHandle = GetSearchHandle(L, "GetFileName", true);
    lua_pushstring(L, searchHandle->first().fileName().toStdString().c_str());
    return 1;
}

static int l_searchHandleGetFileSize(lua_State* L)
{
    QFileInfoList* searchHandle = GetSearchHandle(L, "GetFileSize", true);
    lua_pushinteger(L, searchHandle->first().size());
    return 1;
}

static int l_searchHandleGetFileModifiedTime(lua_State* L)
{
    QFileInfoList* searchHandle = GetSearchHandle(L, "GetFileModifiedTime", true);
    QDateTime modified = searchHandle->first().lastModified();
    lua_pushnumber(L, modified.toMSecsSinceEpoch());
    lua_pushstring(L, modified.date().toString().toStdString().c_str());
    lua_pushstring(L, modified.time().toString().toStdString().c_str());
    return 3;
}

// =================
// General Functions
// =================

static int l_SetWindowTitle(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetWindowTitle(title)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "SetWindowTitle() argument 1: expected string, got %t", 1);
    pobwindow->setTitle(lua_tostring(L, 1));
    return 0;
}

static int l_GetCursorPos(lua_State* L)
{
    QPoint pos = QCursor::pos();
    pos = pobwindow->mapFromGlobal(pos);
    lua_pushinteger(L, pos.x());
    lua_pushinteger(L, pos.y());
    return 2;
}

static int l_SetCursorPos(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 2, "Usage: SetCursorPos(x, y)");
    pobwindow->LAssert(L, lua_isnumber(L, 1), "SetCursorPos() argument 1: expected number, got %t", 1);
    pobwindow->LAssert(L, lua_isnumber(L, 2), "SetCursorPos() argument 2: expected number, got %t", 2);
    //pobwindow->sys->video->SetRelativeCursor((int)lua_tointeger(L, 1), (int)lua_tointeger(L, 2));
    return 0;
}

static int l_ShowCursor(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: ShowCursor(doShow)");
    //pobwindow->sys->ShowCursor(lua_toboolean(L, 1));
    return 0;
}

static int l_IsKeyDown(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: IsKeyDown(keyName)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "IsKeyDown() argument 1: expected string, got %t", 1);
    size_t len;
    const char* kname = lua_tolstring(L, 1, &len);
    pobwindow->LAssert(L, len >= 1, "IsKeyDown() argument 1: string is empty", 1);
    QString k(kname);
    bool result = false;
    if (k == "LEFTBUTTON") {
        if (QGuiApplication::mouseButtons() & Qt::LeftButton) {
            result = true;
        }
    } else {
        int keys = QGuiApplication::keyboardModifiers();
        if (k == "CTRL") {
            result = keys & Qt::ControlModifier;
        } else if (k == "SHIFT") {
            result = keys & Qt::ShiftModifier;
        } else if (k == "ALT") {
            result = keys & Qt::AltModifier;
        } else {
            std::cout << "UNKNOWN ISKEYDOWN: " << k.toStdString() << std::endl;
        }
    }
    lua_pushboolean(L, result);
    //int key = pobwindow->KeyForName(kname);
    //pobwindow->LAssert(L, key, "IsKeyDown(): unrecognised key name");
    //lua_pushboolean(L, pobwindow->sys->IsKeyDown(key));
    return 1;
}

static int l_Copy(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: Copy(string)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "Copy() argument 1: expected string, got %t", 1);
    QGuiApplication::clipboard()->setText(lua_tostring(L, 1));
    return 0;
}

static int l_Paste(lua_State* L)
{
    QString data = QGuiApplication::clipboard()->text();
    if (data.size()) {
        lua_pushstring(L, data.toStdString().c_str());
        return 1;
    } else {
        return 0;
    }
}

static int l_Deflate(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: Deflate(string)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "Deflate() argument 1: expected string, got %t", 1);
    z_stream_s z;
    z.zalloc = NULL;
    z.zfree = NULL;
    deflateInit(&z, 9);
    size_t inLen;
    Byte* in = (Byte*)lua_tolstring(L, 1, &inLen);
    int outSz = deflateBound(&z, inLen);
    Byte* out = new Byte[outSz];
    z.next_in = in;
    z.avail_in = inLen;
    z.next_out = out;
    z.avail_out = outSz;
    int err = deflate(&z, Z_FINISH);
    deflateEnd(&z);
    if (err == Z_STREAM_END) {
        lua_pushlstring(L, (const char*)out, z.total_out);
        delete[] out;
        return 1;
    } else {
        lua_pushnil(L);
        lua_pushstring(L, zError(err));
        delete[] out;
        return 2;
    }
}

static int l_Inflate(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: Inflate(string)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "Inflate() argument 1: expected string, got %t", 1);
    size_t inLen;
    Byte* in = (Byte*)lua_tolstring(L, 1, &inLen);
    int outSz = inLen * 4;
    Byte* out = new Byte[outSz];
    z_stream_s z;
    z.next_in = in;
    z.avail_in = inLen;
    z.zalloc = NULL;
    z.zfree = NULL;
    z.next_out = out;
    z.avail_out = outSz;
    inflateInit(&z);
    int err;
    while ((err = inflate(&z, Z_NO_FLUSH)) == Z_OK) {
        if (z.avail_out == 0) {
            // Output buffer filled, embiggen it
            int newSz = outSz << 1;
            Byte *newOut = (Byte *)realloc(out, newSz);
            if (newOut) {
                out = newOut;
            } else {
                // PANIC
                delete[] out;
                return 0;
            }
            z.next_out = out + outSz;
            z.avail_out = outSz;
            outSz = newSz;
        }
      }
    inflateEnd(&z);
    if (err == Z_STREAM_END) {
        lua_pushlstring(L, (const char*)out, z.total_out);
        delete[] out;
        return 1;
    } else {
        lua_pushnil(L);
        lua_pushstring(L, zError(err));
        delete[] out;
        return 2;
    }
}

static int l_GetTime(lua_State* L)
{
    qint64 ms = QDateTime::currentDateTime().toMSecsSinceEpoch() - pobwindow->baseTime;
    lua_pushinteger(L, ms);
    return 1;
}

static int l_GetScriptPath(lua_State* L)
{
    lua_pushstring(L, pobwindow->scriptPath.toStdString().c_str());
    return 1;
}

static int l_GetRuntimePath(lua_State* L)
{
    lua_pushstring(L, pobwindow->basePath.toStdString().c_str());
    return 1;
}

static int l_GetUserPath(lua_State* L)
{
    lua_pushstring(L, pobwindow->userPath.toStdString().c_str());
    return 1;
}

static int l_MakeDir(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: MakeDir(path)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "MakeDir() argument 1: expected string, got %t", 1);
    lua_pushboolean(L, QDir().mkpath(lua_tostring(L, 1)));
    return 1;
}

static int l_RemoveDir(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: l_RemoveDir(path)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "l_RemoveDir() argument 1: expected string, got %t", 1);
    QDir d;
    if (!d.rmdir(lua_tostring(L, 1))) {
        lua_pushnil(L);
        return 1;
    } else {
        lua_pushboolean(L, true);
        return 1;
    }
}

static int l_SetWorkDir(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetWorkDir(path)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "SetWorkDir() argument 1: expected string, got %t", 1);
    if (QDir::setCurrent(lua_tostring(L, 1))) {
        pobwindow->scriptWorkDir = lua_tostring(L, 1);
    }
    return 0;
}

static int l_GetWorkDir(lua_State* L)
{
    lua_pushstring(L, QDir::currentPath().toStdString().c_str());
    return 1;
}

static int l_LaunchSubScript(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 3, "Usage: LaunchSubScript(scriptText, funcList, subList[, ...])");
    for (int i = 1; i <= 3; i++) {
        pobwindow->LAssert(L, lua_isstring(L, i), "LaunchSubScript() argument %d: expected string, got %t", i, i);
    }
    for (int i = 4; i <= n; i++) {
        pobwindow->LAssert(L, lua_isnil(L, i) || lua_isboolean(L, i) || lua_isnumber(L, i) || lua_isstring(L, i), 
                           "LaunchSubScript() argument %d: only nil, boolean, number and string types can be passed to sub script", i);
    }
    int slot = pobwindow->subScriptList.size();
    pobwindow->subScriptList.append(std::make_shared<SubScript>(L));
    // Signal us when the subscript completes so we can trigger a repaint.
    pobwindow->connect( pobwindow->subScriptList[slot].get(), &SubScript::finished, pobwindow, &POBWindow::subScriptFinished );
    pobwindow->subScriptList[slot]->start();
    lua_pushinteger(L, slot);
    return 1;
}

static int l_AbortSubScript(lua_State* L)
{
    std::cout << "SUBSCRIPT ABORT STUB" << std::endl;
    return 0;
    /*
        int n = lua_gettop(L);
      pobwindow->LAssert(L, n >= 1, "Usage: AbortSubScript(ssID)");
      pobwindow->LAssert(L, lua_islightuserdata(L, 1), "AbortSubScript() argument 1: expected subscript ID, got %t", 1);
      notdword slot = (notdword)lua_touserdata(L, 1);
      pobwindow->LAssert(L, slot < pobwindow->subScriptSize && pobwindow->subScriptList[slot], "AbortSubScript() argument 1: invalid subscript ID");
      pobwindow->LAssert(L, pobwindow->subScriptList[slot]->IsRunning(), "AbortSubScript(): subscript isn't running");
      ui_ISubScript::FreeHandle(pobwindow->subScriptList[slot]);
      pobwindow->subScriptList[slot] = NULL;
      return 0;
    */
}

static int l_IsSubScriptRunning(lua_State* L)
{
    std::cout << "SUBSCRIPT RUNNING STUB" << std::endl;
    return 0;
    /*
        int n = lua_gettop(L);
      pobwindow->LAssert(L, n >= 1, "Usage: IsSubScriptRunning(ssID)");
      pobwindow->LAssert(L, lua_islightuserdata(L, 1), "IsSubScriptRunning() argument 1: expected subscript ID, got %t", 1);
      notdword slot = (notdword)lua_touserdata(L, 1);
      pobwindow->LAssert(L, slot < pobwindow->subScriptSize && pobwindow->subScriptList[slot], "IsSubScriptRunning() argument 1: invalid subscript ID");
      lua_pushboolean(L, pobwindow->subScriptList[slot]->IsRunning());
      return 1;
    */
}

static int l_LoadModule(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: LoadModule(name[, ...])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "LoadModule() argument 1: expected string, got %t", 1);
    QString fileName(lua_tostring(L, 1));
    if (!fileName.endsWith(".lua")) {
        fileName = fileName + ".lua";
    }
    QDir::setCurrent(pobwindow->scriptPath);
    int err = luaL_loadfile(L, fileName.toStdString().c_str());
    QDir::setCurrent(pobwindow->scriptWorkDir);
    pobwindow->LAssert(L, err == 0, "LoadModule() error loading '%s':\n%s", fileName.toStdString().c_str(), lua_tostring(L, -1));
    lua_replace(L, 1);	// Replace module name with module main chunk
    lua_call(L, n - 1, LUA_MULTRET);
    return lua_gettop(L);
}

static int l_PLoadModule(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: PLoadModule(name[, ...])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "PLoadModule() argument 1: expected string, got %t", 1);
    QString fileName(lua_tostring(L, 1));
    if (!fileName.endsWith(".lua")) {
        fileName = fileName + ".lua";
    }
    QDir::setCurrent(pobwindow->scriptPath);
    int err = luaL_loadfile(L, fileName.toStdString().c_str());
    QDir::setCurrent(pobwindow->scriptWorkDir);
    if (err) {
        return 1;
    }
    lua_replace(L, 1);	// Replace module name with module main chunk
    //lua_getfield(L, LUA_REGISTRYINDEX, "traceback");
    //lua_insert(L, 1); // Insert traceback function at start of stack
    err = lua_pcall(L, n - 1, LUA_MULTRET, 0);
    if (err) {
        return 1;
    }
    lua_pushnil(L);
    lua_insert(L, 1);
//    lua_replace(L, 1); // Replace traceback function with nil
    return lua_gettop(L);
}

static int l_PCall(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: PCall(func[, ...])");
    pobwindow->LAssert(L, lua_isfunction(L, 1), "PCall() argument 1: expected function, got %t", 1);
    lua_getfield(L, LUA_REGISTRYINDEX, "traceback");
    lua_insert(L, 1); // Insert traceback function at start of stack
    int err = lua_pcall(L, n - 1, LUA_MULTRET, 1);
    if (err) {
        lua_error(L);
        return 1;
    }
    lua_pushnil(L);
    lua_replace(L, 1); // Replace traceback function with nil
    return lua_gettop(L);
}

static int l_ConPrintf(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: ConPrintf(fmt[, ...])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "ConPrintf() argument 1: expected string, got %t", 1);
    lua_pushvalue(L, lua_upvalueindex(1));	// string.format
    lua_insert(L, 1);
    lua_call(L, n, 1);
    pobwindow->LAssert(L, lua_isstring(L, 1), "ConPrintf() error: string.format returned non-string");
    //std::cout << lua_tostring(L, 1) << std::endl;
    //pobwindow->sys->con->Printf("%s\n", lua_tostring(L, 1));
    return 0;
}

static void printTableItter(lua_State* L, int index, int level, bool recurse)
{
    lua_checkstack(L, 5);
    lua_pushnil(L);
    while (lua_next(L, index)) {
        for (int t = 0; t < level; t++) std::cout << "  ";
        // Print key
        if (lua_type(L, -2) == LUA_TSTRING) {
            std::cout << "[\"" << lua_tostring(L, -2) << "\"] = ";
        } else {
            lua_pushvalue(L, 2);	// Push tostring function
            lua_pushvalue(L, -3);	// Push key
            lua_call(L, 1, 1);		// Call tostring
            std::cout << lua_tostring(L, -1) << " = ";
            lua_pop(L, 1);			// Pop result of tostring
        }
        // Print value
        if (lua_type(L, -1) == LUA_TTABLE) {
            bool expand = recurse;
            if (expand) {
                lua_pushvalue(L, -1);	// Push value
                lua_gettable(L, 3);		// Index printed tables list
                expand = lua_toboolean(L, -1) == 0;
                lua_pop(L, 1);			// Pop result of indexing
            }
            if (expand) {
                lua_pushvalue(L, -1);	// Push value
                lua_pushboolean(L, 1);
                lua_settable(L, 3);		// Add to printed tables list
                std::cout << "table: " << lua_topointer(L, -1) << " {"
                          << std::endl;
                printTableItter(L, lua_gettop(L), level + 1, true);
                for (int t = 0; t < level; t++) std::cout << "  ";
                std::cout << "}" << std::endl;
            } else {
                std::cout << "table: " << lua_topointer(L, -1) << " { ... }\n";
            }
        } else if (lua_type(L, -1) == LUA_TSTRING) {
            std::cout << "\"" << lua_tostring(L, -1) << "\"" << std::endl;
        } else {
            lua_pushvalue(L, 2);	// Push tostring function
            lua_pushvalue(L, -2);	// Push value
            lua_call(L, 1, 1);		// Call tostring
            std::cout << lua_tostring(L, -1) << std::endl;
            lua_pop(L, 1);			// Pop result of tostring
        }
        lua_pop(L, 1);	// Pop value
    }
}

static int l_ConPrintTable(lua_State* L)
{
    return 0;
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: ConPrintTable(tbl[, noRecurse])");
    pobwindow->LAssert(L, lua_istable(L, 1), "ConPrintTable() argument 1: expected table, got %t", 1);
    bool recurse = lua_toboolean(L, 2) == 0;
    lua_settop(L, 1);
    lua_getglobal(L, "tostring");
    lua_newtable(L);		// Printed tables list
    lua_pushvalue(L, 1);	// Push root table
    lua_pushboolean(L, 1);
    lua_settable(L, 3);		// Add root table to printed tables list
    printTableItter(L, 1, 0, recurse);
    return 0;
}

static int l_ConExecute(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: ConExecute(cmd)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "ConExecute() argument 1: expected string, got %t", 1);
    //pobwindow->sys->con->Execute(lua_tostring(L,1)); // FIXME
    return 0;
}

static int l_ConClear(lua_State* L)
{
//    pobwindow->sys->con->Clear();
    return 0;
}

static int l_print(lua_State* L)
{
    int n = lua_gettop(L);
    lua_getglobal(L, "tostring");
    for (int i = 1; i <= n; i++) {
        lua_pushvalue(L, -1);	// Push tostring function
        lua_pushvalue(L, i);
        lua_call(L, 1, 1);		// Call tostring
        const char* s = lua_tostring(L, -1);
        pobwindow->LAssert(L, s != NULL, "print() error: tostring returned non-string");
        if (i > 1) std::cout << " ";
        std::cout << s;
        lua_pop(L, 1);			// Pop result of tostring
    }
    std::cout << std::endl;
    return 0;
}

static int l_SpawnProcess(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SpawnProcess(cmdName[, args])");
    pobwindow->LAssert(L, lua_isstring(L, 1), "SpawnProcess() argument 1: expected string, got %t", 1);
    // FIXME
//    pobwindow->sys->SpawnProcess(lua_tostring(L, 1), lua_tostring(L, 2));
    return 0;
}

static int l_OpenURL(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: OpenURL(url)");
    pobwindow->LAssert(L, lua_isstring(L, 1), "OpenURL() argument 1: expected string, got %t", 1);
    // FIXME
    //pobwindow->sys->OpenURL(lua_tostring(L, 1));
    return 0;
}

static int l_SetProfiling(lua_State* L)
{
    int n = lua_gettop(L);
    pobwindow->LAssert(L, n >= 1, "Usage: SetProfiling(isEnabled)");
    // FIXME
    //pobwindow->debug->SetProfiling(lua_toboolean(L, 1) == 1);
    return 0;
}

static int l_Restart(lua_State* L)
{
    // FIXME
    //pobwindow->restartFlag = true;
    return 0;
}

static int l_Exit(lua_State* L)
{
    int n = lua_gettop(L);
    const char* msg = nullptr;
    if (n >= 1 && !lua_isnil(L, 1)) {
        pobwindow->LAssert(L, lua_isstring(L, 1), "Exit() argument 1: expected string or nil, got %t", 1);
        msg = lua_tostring(L, 1);
    }
    // FIXME
    //pobwindow->sys->Exit(msg);
    //pobwindow->didExit = true;
//	lua_pushstring(L, "dummy");
//	lua_error(L);
    return 0;
}

#define ADDFUNC(n) lua_pushcclosure(L, l_##n, 0);lua_setglobal(L, #n);
#define ADDFUNCCL(n, u) lua_pushcclosure(L, l_##n, u);lua_setglobal(L, #n);

int main(int argc, char **argv)
{
    QGuiApplication app{argc, argv};

    QStringList args = app.arguments();

    pobwindow = new POBWindow;

    if (args.size() > 1) {
        bool ok;
        int ff = args[1].toInt(&ok);
        if (ok) {
            pobwindow->fontFudge = ff;
            args.removeAt(1); // Remove our hacky font factor from the arglist passed on to the script
        }
    }

    L = luaL_newstate();
    luaL_openlibs(L);
    luaJIT_setmode(L, 0, LUAJIT_MODE_ENGINE|LUAJIT_MODE_OFF);

    // Callbacks
    lua_newtable(L);		// Callbacks table
    lua_pushvalue(L, -1);	// Push callbacks table
    ADDFUNCCL(SetCallback, 1);
    lua_pushvalue(L, -1);	// Push callbacks table
    ADDFUNCCL(GetCallback, 1);
    lua_pushvalue(L, -1);	// Push callbacks table
    ADDFUNCCL(SetMainObject, 1);
    lua_setfield(L, LUA_REGISTRYINDEX, "uicallbacks");

    // Image handles
    lua_newtable(L);		// Image handle metatable
    lua_pushvalue(L, -1);	// Push image handle metatable
    ADDFUNCCL(NewImageHandle, 1);
    lua_pushvalue(L, -1);	// Push image handle metatable
    lua_setfield(L, -2, "__index");
    lua_pushcfunction(L, l_imgHandleGC);
    lua_setfield(L, -2, "__gc");
    lua_pushcfunction(L, l_imgHandleLoad);
    lua_setfield(L, -2, "Load");
    lua_pushcfunction(L, l_imgHandleUnload);
    lua_setfield(L, -2, "Unload");
    lua_pushcfunction(L, l_imgHandleIsValid);
    lua_setfield(L, -2, "IsValid");
    lua_pushcfunction(L, l_imgHandleIsLoading);
    lua_setfield(L, -2, "IsLoading");
    lua_pushcfunction(L, l_imgHandleSetLoadingPriority);
    lua_setfield(L, -2, "SetLoadingPriority");
    lua_pushcfunction(L, l_imgHandleImageSize);
    lua_setfield(L, -2, "ImageSize");
    lua_setfield(L, LUA_REGISTRYINDEX, "uiimghandlemeta");

    // Rendering
    ADDFUNC(RenderInit);
    ADDFUNC(GetScreenSize);
    ADDFUNC(SetClearColor);
    ADDFUNC(SetDrawLayer);
    ADDFUNC(SetViewport);
    ADDFUNC(SetDrawColor);
    ADDFUNC(DrawImage);
    ADDFUNC(DrawImageQuad);
    ADDFUNC(DrawString);
    ADDFUNC(DrawStringWidth);
    ADDFUNC(DrawStringCursorIndex);
    ADDFUNC(StripEscapes);
    ADDFUNC(GetAsyncCount);

    // Search handles
    lua_newtable(L);	// Search handle metatable
    lua_pushvalue(L, -1);	// Push search handle metatable
    ADDFUNCCL(NewFileSearch, 1);
    lua_pushvalue(L, -1);	// Push search handle metatable
    lua_setfield(L, -2, "__index");
    lua_pushcfunction(L, l_searchHandleGC);
    lua_setfield(L, -2, "__gc");
    lua_pushcfunction(L, l_searchHandleNextFile);
    lua_setfield(L, -2, "NextFile");
    lua_pushcfunction(L, l_searchHandleGetFileName);
    lua_setfield(L, -2, "GetFileName");
    lua_pushcfunction(L, l_searchHandleGetFileSize);
    lua_setfield(L, -2, "GetFileSize");
    lua_pushcfunction(L, l_searchHandleGetFileModifiedTime);
    lua_setfield(L, -2, "GetFileModifiedTime");
    lua_setfield(L, LUA_REGISTRYINDEX, "uisearchhandlemeta");

    // General function
    ADDFUNC(SetWindowTitle);
    ADDFUNC(GetCursorPos);
    ADDFUNC(SetCursorPos);
    ADDFUNC(ShowCursor);
    ADDFUNC(IsKeyDown);
    ADDFUNC(Copy);
    ADDFUNC(Paste);
    ADDFUNC(Deflate);
    ADDFUNC(Inflate);
    ADDFUNC(GetTime);
    ADDFUNC(GetScriptPath);
    ADDFUNC(GetRuntimePath);
    ADDFUNC(GetUserPath);
    ADDFUNC(MakeDir);
    ADDFUNC(RemoveDir);
    ADDFUNC(SetWorkDir);
    ADDFUNC(GetWorkDir);
    ADDFUNC(LaunchSubScript);
    ADDFUNC(AbortSubScript);
    ADDFUNC(IsSubScriptRunning);
    ADDFUNC(LoadModule);
    ADDFUNC(PLoadModule);
    ADDFUNC(PCall);
    lua_getglobal(L, "string");
    lua_getfield(L, -1, "format");
    ADDFUNCCL(ConPrintf, 1);
    lua_pop(L, 1);		// Pop 'string' table
    ADDFUNC(ConPrintTable);
    ADDFUNC(ConExecute);
    ADDFUNC(ConClear);
    ADDFUNC(print);
    ADDFUNC(SpawnProcess);
    ADDFUNC(OpenURL);
    ADDFUNC(SetProfiling);
    ADDFUNC(Restart);
    ADDFUNC(Exit);
    lua_getglobal(L, "os");
    lua_pushcfunction(L, l_Exit);
    lua_setfield(L, -2, "exit");
    lua_pop(L, 1);		// Pop 'os' table

    // Set up args table
    lua_createtable(L, args.size() - 1, 1);
    for (int i = 0; i < args.size(); i++) {
        lua_pushstring(L, args[i].toStdString().c_str());
        lua_rawseti(L, -2, i);
    }
    lua_setglobal(L, "arg");

    int result = luaL_dofile(L, "Launch.lua");
    if (result != 0) {
        lua_error(L);
    }

    pushCallback("OnInit");
    result = lua_pcall(L, 1, 0, 0);
    if (result != 0) {
        lua_error(L);
    }
    pobwindow->resize(800, 600);
    pobwindow->show();
    QFontDatabase::addApplicationFont("VeraMono.ttf");
    QFontDatabase::addApplicationFont("LiberationSans-Regular.ttf");
    QFontDatabase::addApplicationFont("LiberationSans-Bold.ttf");
    return app.exec();
}