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#include <SDL.h>
#include <glib-object.h>
#include <lauxlib.h>
#include <lua.h>
#include <pango/pangoft2.h>
#include "window.h"
#include "sdl.h"
#define UD_WINDOW "libluiml.window"
struct window {
SDL_Window *win;
SDL_Renderer *ren;
PangoContext *pc;
};
/* window:destroy_window() */
static int destroy_window(lua_State *L)
{
struct window *w;
w = luaL_checkudata(L, 1, UD_WINDOW);
SDL_DestroyWindow(w->win);
g_object_unref(w->pc);
release_sdl();
return 0;
}
#include "window_wait_event.c"
/* window:get_dimensions() -> width, height */
static int get_dimensions(lua_State *L)
{
struct window *w;
int width, height;
w = luaL_checkudata(L, 1, UD_WINDOW);
SDL_GetWindowSize(w->win, &width, &height);
lua_pushnumber(L, width);
lua_pushnumber(L, height);
return 2;
}
double clamp(double v, double min, double max)
{
if (v < min) return min;
if (v > max) return max;
return v;
}
/* window:draw_rect(x, y, width, height, r, g, b) */
static int draw_rect(lua_State *L)
{
struct window *w;
SDL_Rect r;
struct {
Uint8 r, g, b;
} colour;
w = luaL_checkudata(L, 1, UD_WINDOW);
r.x = luaL_checknumber(L, 2);
r.y = luaL_checknumber(L, 3);
r.w = luaL_checknumber(L, 4);
r.h = luaL_checknumber(L, 5);
colour.r = round(clamp(luaL_checknumber(L, 6), 0, 1) * 255.0);
colour.g = round(clamp(luaL_checknumber(L, 7), 0, 1) * 255.0);
colour.b = round(clamp(luaL_checknumber(L, 8), 0, 1) * 255.0);
SDL_SetRenderDrawColor(w->ren, colour.r, colour.g, colour.b, SDL_ALPHA_OPAQUE);
SDL_RenderFillRect(w->ren, &r);
return 0;
}
static int draw_text(lua_State *L)
{
PangoRectangle extents;
PangoLayout *layout;
int width, height;
struct window *w;
const char *s;
SDL_Rect r;
size_t l;
w = luaL_checkudata(L, 1, UD_WINDOW);
r.x = luaL_checknumber(L, 2);
r.y = luaL_checknumber(L, 3);
r.w = luaL_checknumber(L, 4);
r.h = luaL_checknumber(L, 5);
s = luaL_checklstring(L, 6, &l);
layout = pango_layout_new(w->pc);
pango_layout_set_width(layout, r.w * PANGO_SCALE);
pango_layout_set_height(layout, r.h * PANGO_SCALE);
pango_layout_set_text(layout, s, l);
pango_layout_get_extents(layout, NULL, &extents);
width = PANGO_PIXELS(extents.width);
height = PANGO_PIXELS(extents.height);
return 0;
}
static int show(lua_State *L)
{
struct window *w;
w = luaL_checkudata(L, 1, UD_WINDOW);
SDL_RenderPresent(w->ren);
return 0;
}
/* create_window(title) -> window */
int create_window(lua_State *L)
{
static const struct luaL_Reg window_metatable[] = {
{"__gc", destroy_window},
{"wait_event", wait_event},
{"get_dimensions", get_dimensions},
{"draw_rect", draw_rect},
{"draw_text", draw_text},
{"show", show},
{NULL, NULL},
};
PangoFontMap *fontmap;
const char *title, *failed;
struct window *w;
if (luaL_newmetatable(L, UD_WINDOW)) {
lua_pushstring(L, "__index");
lua_pushvalue(L, -2);
lua_settable(L, -3);
luaL_register(L, NULL, window_metatable);
lua_pop(L, 1);
}
title = luaL_checkstring(L, 1);
acquire_sdl();
w = lua_newuserdata(L, sizeof *w);
w->win = SDL_CreateWindow(title,
SDL_WINDOWPOS_UNDEFINED,
SDL_WINDOWPOS_UNDEFINED,
640, 480, SDL_WINDOW_RESIZABLE);
if (w->win == NULL) {
failed = "SDL_CreateWindow";
goto fail_win;
}
w->ren = SDL_CreateRenderer(w->win, 0, SDL_RENDERER_PRESENTVSYNC);
if (w->ren == NULL) {
failed = "SDL_CreateRenderer";
goto fail_ren;
}
fontmap = pango_ft2_font_map_new();
w->pc = pango_font_map_create_context(fontmap);
g_object_unref(fontmap);
luaL_getmetatable(L, UD_WINDOW);
lua_setmetatable(L, -2);
return 1;
fail_ren: SDL_DestroyWindow(w->win);
fail_win: release_sdl();
return sdl_error(L, failed);
}
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