Merge branch 'Lua-video-lib-expansion' into 'next'

Lua video lib expansion

New video/drawer library functions for hud.add to use:

v.width() and v.height() return the screen width and height respectively (in other words you get the screen resolution), while v.renderer() returns the string for the renderer used ("software", "opengl", or "none").

Possibly add more stuff later, but for now these things at the least can be merged in next

See merge request !40

src/lua_hudlib.c

@@ -16,7 +16,9 @@
 #include "r_local.h"
 #include "st_stuff.h" // hudinfo[]
 #include "g_game.h"
+#include "i_video.h" // rendermode
 #include "p_local.h" // camera_t
+#include "screen.h" // screen width/height
 #include "v_video.h"
 #include "w_wad.h"
 #include "z_zone.h"
@@ -486,7 +488,7 @@ static int libd_getColormap(lua_State *L)
 	INT32 skinnum = TC_DEFAULT;
 	skincolors_t color = luaL_optinteger(L, 2, 0);
 	UINT8* colormap = NULL;
-	//HUDSAFE
+	HUDONLY
 	if (lua_isnoneornil(L, 1))
 		; // defaults to TC_DEFAULT
 	else if (lua_type(L, 1) == LUA_TNUMBER) // skin number
@@ -510,6 +512,31 @@ static int libd_getColormap(lua_State *L)
 	return 1;
 }
 
+static int libd_width(lua_State *L)
+{
+	HUDONLY
+	lua_pushinteger(L, vid.width); // push screen width
+	return 1;
+}
+
+static int libd_height(lua_State *L)
+{
+	HUDONLY
+	lua_pushinteger(L, vid.height); // push screen height
+	return 1;
+}
+
+static int libd_renderer(lua_State *L)
+{
+	HUDONLY
+	switch (rendermode) {
+		case render_opengl: lua_pushliteral(L, "opengl");   break; // OpenGL renderer
+		case render_soft:   lua_pushliteral(L, "software"); break; // Software renderer
+		default:            lua_pushliteral(L, "none");     break; // render_none (for dedicated), in case there's any reason this should be run
+	}
+	return 1;
+}
+
 static luaL_Reg lib_draw[] = {
 	{"patchExists", libd_patchExists},
 	{"cachePatch", libd_cachePatch},
@@ -521,6 +548,9 @@ static luaL_Reg lib_draw[] = {
 	{"drawString", libd_drawString},
 	{"stringWidth", libd_stringWidth},
 	{"getColormap", libd_getColormap},
+	{"width", libd_width},
+	{"height", libd_height},
+	{"renderer", libd_renderer},
 	{NULL, NULL}
 };