Lua bindings for FTGL (FreeType font rendering in OpenGL)

Question

I wrote some Lua bindings for FTGL's C API. This works well enough, but I ended up with lots of macros, one for each Lua function signature. For example, LUD_NUMBER_NUMBER_TO_NUMBER creates a Lua function that takes a lightuserdata argument followed by two numeric arguments and returns a number.

I like having most of the functions created with macros, because when reading the code, you can tell those functions are simply passing the same values through to the C API, and the functions that are actually written out have more interesting stuff going on.

I'm wondering if there's a way to reduce the redundancy in the macros themselves, though, or a better way to handle this. I thought about having one macro for each number of parameters, and passing in the parameter types (number, userdata, etc.), but you'd have to pass each type name once in lower case and once in upper case, making it difficult to read.

What can I do to clean this up?

#include <stdlib.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <FTGL/ftgl.h>

#define ustring const unsigned char *

/* work around typo in FTGL */
#ifndef ftglGetLayoutAlignment
  #define ftglGetLayoutAlignment ftglGetLayoutAlignement
#endif

#define LUD_LUD_TO_NIL(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TLIGHTUSERDATA); \
    name(lua_touserdata(L, 1), lua_touserdata(L, 2)); \
    return 0; \
}

#define LUD_NUMBER_NUMBER_TO_NIL(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TNUMBER); \
    luaL_checktype(L, 3, LUA_TNUMBER); \
    name(lua_touserdata(L, 1),  lua_tonumber(L, 2), lua_tonumber(L, 3)); \
    return 0; \
}

#define LUD_NUMBER_NUMBER_TO_NUMBER(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TNUMBER); \
    luaL_checktype(L, 3, LUA_TNUMBER); \
    lua_pushnumber(L, name(lua_touserdata(L, 1),  lua_tonumber(L, 2), \
        lua_tonumber(L, 3))); \
    return 1; \
}

#define LUD_NUMBER_TO_NIL(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TNUMBER); \
    name(lua_touserdata(L, 1), lua_tonumber(L, 2)); \
    return 0; \
}

#define LUD_NUMBER_TO_NUMBER(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TNUMBER); \
    lua_pushnumber(L, name(lua_touserdata(L, 1), lua_tonumber(L, 2))); \
    return 1; \
}

#define LUD_STRING_NUMBER_TO_NIL(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TSTRING); \
    luaL_checktype(L, 3, LUA_TNUMBER); \
    name(lua_touserdata(L, 1),  lua_tostring(L, 2), lua_tonumber(L, 3)); \
    return 0; \
}

#define LUD_STRING_TO_NUMBER(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    luaL_checktype(L, 2, LUA_TSTRING); \
    lua_pushnumber(L, name(lua_touserdata(L, 1), lua_tostring(L, 2))); \
    return 1; \
}

#define LUD_TO_LUD(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    lua_pushlightuserdata(L, name(lua_touserdata(L, 1))); \
    return 1; \
}

#define LUD_TO_NIL(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    name(lua_touserdata(L, 1)); \
    return 0; \
}

#define LUD_TO_NUMBER(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); \
    lua_pushnumber(L, name(lua_touserdata(L, 1))); \
    return 1; \
}

#define NIL_TO_LUD(name) \
int lf_ ## name (lua_State *L) { \
    lua_pushlightuserdata(L, name()); \
    return 1; \
}

#define STRING_TO_LUD(name) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_TSTRING); \
    const char *a1 = lua_tostring(L, 1); \
    lua_pushlightuserdata(L, name(a1)); \
    return 1; \
}

#define PREFIXED_CONST(name, prefix) \
    lua_pushstring(L, #name); \
    lua_pushnumber(L, prefix ## _ ## name); \
    lua_rawset(L, -3);

#define FT_CONST(name) PREFIXED_CONST(name, FT)
#define FTGL_CONST(name) PREFIXED_CONST(name, FTGL)

LUD_TO_NIL(ftglDestroyFont)
LUD_STRING_TO_NUMBER(ftglAttachFile)

/*
int ftglAttachData(FTGLfont* font, const unsigned char * data,
                               size_t size);
*/
int lf_ftglAttachData(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    size_t size;
    ustring data = (ustring)lua_tolstring(L, 2, &size);
    lua_pushnumber(L, ftglAttachData(
        lua_touserdata(L, 1), data, size));
    return 1;
}

LUD_NUMBER_TO_NUMBER(ftglSetFontCharMap)
LUD_TO_NUMBER(ftglGetFontCharMapCount)

/*
FT_Encoding* ftglGetFontCharMapList(FTGLfont* font)
*/
int lf_ftglGetFontCharMapList(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    FTGLfont *font;
    FT_Encoding *charMapList;
    font = lua_touserdata(L, 1);
    unsigned int charMapCount = ftglGetFontCharMapCount(font);
    charMapList = ftglGetFontCharMapList(font);
    lua_newtable(L);
    for (int i = 0; i < charMapCount; i++) {
        lua_pushnumber(L, charMapList[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUD_NUMBER_NUMBER_TO_NUMBER(ftglSetFontFaceSize)
LUD_TO_NUMBER(ftglGetFontFaceSize)
LUD_NUMBER_TO_NIL(ftglSetFontDepth)
LUD_NUMBER_NUMBER_TO_NIL(ftglSetFontOutset)
LUD_NUMBER_TO_NIL(ftglSetFontDisplayList)
LUD_TO_NUMBER(ftglGetFontAscender)
LUD_TO_NUMBER(ftglGetFontDescender)
LUD_TO_NUMBER(ftglGetFontLineHeight)

/*
void ftglGetFontBBox(FTGLfont* font, const char *string,
                                 int len, float bounds[6]);
*/
int lf_ftglGetFontBBox(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    size_t len;
    const char *a2 = lua_tolstring(L, 2, &len);
    float bounds[6];
    ftglGetFontBBox(lua_touserdata(L, 1), a2, len, bounds);
    lua_newtable(L);
    for (int i = 0; i < 6; i++) {
        lua_pushnumber(L, bounds[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUD_STRING_TO_NUMBER(ftglGetFontAdvance)
LUD_STRING_NUMBER_TO_NIL(ftglRenderFont)
LUD_TO_NUMBER(ftglGetFontError)
STRING_TO_LUD(ftglCreateBitmapFont)
STRING_TO_LUD(ftglCreateBufferFont)
STRING_TO_LUD(ftglCreateExtrudeFont)
STRING_TO_LUD(ftglCreateOutlineFont)
STRING_TO_LUD(ftglCreatePixmapFont)
STRING_TO_LUD(ftglCreatePolygonFont)
STRING_TO_LUD(ftglCreateTextureFont)
LUD_TO_NIL(ftglDestroyLayout)

/* 
void ftglGetLayoutBBox(FTGLlayout *layout, const char* string,
                                   float bounds[6]);
*/
int lf_ftglGetLayoutBBox(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    FTGLlayout *a1 = lua_touserdata(L, 1);
    const char *a2 = lua_tostring(L, 2);
    float bounds[6];
    ftglGetLayoutBBox(a1, a2, bounds);
    lua_newtable(L);
    for (int i = 0; i < 6; i++) {
        lua_pushnumber(L, bounds[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUD_STRING_NUMBER_TO_NIL(ftglRenderLayout)
LUD_TO_NUMBER(ftglGetLayoutError)
NIL_TO_LUD(ftglCreateSimpleLayout)
LUD_LUD_TO_NIL(ftglSetLayoutFont)
LUD_TO_LUD(ftglGetLayoutFont)
LUD_NUMBER_TO_NIL(ftglSetLayoutLineLength)
LUD_TO_NUMBER(ftglGetLayoutLineLength)
LUD_NUMBER_TO_NIL(ftglSetLayoutAlignment)
LUD_TO_NUMBER(ftglGetLayoutAlignment)
LUD_NUMBER_TO_NIL(ftglSetLayoutLineSpacing)
/* http://sourceforge.net/p/ftgl/bugs/35/
LUD_TO_NUMBER(ftglGetLayoutLineSpacing) */


int luaopen_luaftgl(lua_State *L)
{
    const luaL_Reg api[] = {

        /* FTFont functions (FTGL/FTFont.h) */
        { "destroyFont", lf_ftglDestroyFont },
        { "attachFile", lf_ftglAttachFile },
        { "attachData", lf_ftglAttachData },
        { "setFontCharMap", lf_ftglSetFontCharMap },
        { "getFontCharMapCount", lf_ftglGetFontCharMapCount },
        { "getFontCharMapList", lf_ftglGetFontCharMapList },
        { "setFontFaceSize", lf_ftglSetFontFaceSize },
        { "getFontFaceSize", lf_ftglGetFontFaceSize },
        { "setFontDepth", lf_ftglSetFontDepth },
        { "setFontOutset", lf_ftglSetFontOutset },
        { "setFontDisplayList", lf_ftglSetFontDisplayList },
        { "getFontAscender", lf_ftglGetFontAscender },
        { "getFontDescender", lf_ftglGetFontDescender },
        { "getFontLineHeight", lf_ftglGetFontLineHeight },
        { "getFontBoundingBox", lf_ftglGetFontBBox }, /* added */
        { "getFontBBox", lf_ftglGetFontBBox }, /* original */
        { "getFontAdvance", lf_ftglGetFontAdvance },
        { "renderFont", lf_ftglRenderFont },
        { "getFontError", lf_ftglGetFontError },

        /* FTGL*Font functions (FTGL/FTGL*Font.h) */
        { "createBitmapFont", lf_ftglCreateBitmapFont },
        { "createBufferFont", lf_ftglCreateBufferFont },
        { "createExtrudeFont", lf_ftglCreateExtrudeFont },
        { "createOutlineFont", lf_ftglCreateOutlineFont },
        { "createPixmapFont", lf_ftglCreatePixmapFont },
        { "createPolygonFont", lf_ftglCreatePolygonFont },
        { "createTextureFont", lf_ftglCreateTextureFont },

        /* FTLayout functions (FTGL/FTLayout.h) */
        { "destroyLayout", lf_ftglDestroyLayout },
        { "getLayoutBoundingBox", lf_ftglGetLayoutBBox }, /* added */
        { "getLayoutBBox", lf_ftglGetLayoutBBox }, /* original */
        { "renderLayout", lf_ftglRenderLayout },
        { "getLayoutError", lf_ftglGetLayoutError },

        /* FTSimpleLayout functions (FTGL/FTSimpleLayout.h) */
        { "createSimpleLayout", lf_ftglCreateSimpleLayout },
        { "setLayoutFont", lf_ftglSetLayoutFont },
        { "getLayoutFont", lf_ftglGetLayoutFont },
        { "setLayoutLineLength", lf_ftglSetLayoutLineLength },
        { "getLayoutLineLength", lf_ftglGetLayoutLineLength },
        { "setLayoutAlignment", lf_ftglSetLayoutAlignment },
        { "getLayoutAlignment", lf_ftglGetLayoutAlignment }, /* added */
        { "getLayoutAlignement", lf_ftglGetLayoutAlignment }, /* original */
        { "setLayoutLineSpacing", lf_ftglSetLayoutLineSpacing },
        /* http://sourceforge.net/p/ftgl/bugs/35/
        { "getLayoutLineSpacing", lf_ftglGetLayoutLineSpacing }, */

        { NULL, NULL }
    };

#if LUA_VERSION_NUM == 501
    luaL_register (L, "luaftgl", api);
#else
    luaL_newlib (L, api);
#endif

    /*  FT_Encoding (freetype.h) */
    FT_CONST(ENCODING_NONE)
    FT_CONST(ENCODING_MS_SYMBOL)
    FT_CONST(ENCODING_UNICODE)
    FT_CONST(ENCODING_SJIS)
    FT_CONST(ENCODING_GB2312)
    FT_CONST(ENCODING_BIG5)
    FT_CONST(ENCODING_WANSUNG)
    FT_CONST(ENCODING_JOHAB)
    FT_CONST(ENCODING_MS_SJIS)
    FT_CONST(ENCODING_MS_GB2312)
    FT_CONST(ENCODING_MS_BIG5)
    FT_CONST(ENCODING_MS_WANSUNG)
    FT_CONST(ENCODING_MS_JOHAB)
    FT_CONST(ENCODING_ADOBE_STANDARD)
    FT_CONST(ENCODING_ADOBE_EXPERT)
    FT_CONST(ENCODING_ADOBE_CUSTOM)
    FT_CONST(ENCODING_ADOBE_LATIN_1)
    FT_CONST(ENCODING_OLD_LATIN_2)
    FT_CONST(ENCODING_APPLE_ROMAN)

    /*  FTGL constants */
    FTGL_CONST(RENDER_FRONT)
    FTGL_CONST(RENDER_BACK)
    FTGL_CONST(RENDER_SIDE)
    FTGL_CONST(RENDER_ALL)
    FTGL_CONST(ALIGN_LEFT)
    FTGL_CONST(ALIGN_CENTER)
    FTGL_CONST(ALIGN_RIGHT)
    FTGL_CONST(ALIGN_JUSTIFY)

    return 1;
}

You can reduce the redundant luaL_checktype(L, 1, LUA_TLIGHTUSERDATA); — hjpotter92, Sep 13, 2014 at 3:03
@hjpotter92 I'm not sure what you mean, how would you reduce it? — Dagg, Sep 13, 2014 at 11:54

Dagg · Accepted Answer · 2014-09-13 13:51:24Z

Here's what I came up with. I'm not sure if this is better or worse, but it's less code. Feel free to review this instead of the code in the question (or both).

Some extra definitions get around the upper/lower case problem mentioned in the question:

#define LUA_Tlightuserdata LUA_TLIGHTUSERDATA
#define LUA_Tstring LUA_TSTRING
#define LUA_Tnumber LUA_TNUMBER

And a special case definition since Lua uses lua_touserdata for both kinds of userdata:

#define lua_tolightuserdata lua_touserdata

And a weird hack to allow us to avoid separate macros for functions that return values and functions that don't:

#define lua_pushvoid(L, x) x; lua_pushnil(L)

With those definitions, we just need a separate macro for each number of arguments a function can take; here's the macro for 2-arg functions:

#define LUA_FUNC_2(name, t1, t2, tr) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_T ## t1); \
    luaL_checktype(L, 2, LUA_T ## t2); \
    lua_push ## tr(L, name(lua_to ## t1(L, 1), lua_to ## t2(L, 2))); \
    return 1; \
}

It could be invoked like this:

LUA_FUNC_2(ftglSetFontDisplayList, lightuserdata, number, void)

That creates a function that takes a lightuserdata and a number argument and returns nil. I use void instead of nil because lua_pushnil already exists, and it only takes one argument (the Lua state).

Here's the whole thing:

#include <stdlib.h>
#include <lua.h>
#include <lualib.h>
#include <lauxlib.h>
#include <FTGL/ftgl.h>

#define ustring const unsigned char *

/* work around typo in FTGL */
#ifndef ftglGetLayoutAlignment
  #define ftglGetLayoutAlignment ftglGetLayoutAlignement
#endif

#define LUA_Tlightuserdata LUA_TLIGHTUSERDATA
#define LUA_Tstring LUA_TSTRING
#define LUA_Tnumber LUA_TNUMBER
#define lua_tolightuserdata lua_touserdata
#define lua_pushvoid(L, x) x; lua_pushnil(L)

#define LUA_FUNC_0(name, tr) \
int lf_ ## name (lua_State *L) { \
    lua_push ## tr(L, name()); \
    return 1; \
}

#define LUA_FUNC_1(name, t1, tr) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_T ## t1); \
    lua_push ## tr(L, name(lua_to ## t1(L, 1))); \
    return 1; \
}

#define LUA_FUNC_2(name, t1, t2, tr) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_T ## t1); \
    luaL_checktype(L, 2, LUA_T ## t2); \
    lua_push ## tr(L, name(lua_to ## t1(L, 1), lua_to ## t2(L, 2))); \
    return 1; \
}

#define LUA_FUNC_3(name, t1, t2, t3, tr) \
int lf_ ## name (lua_State *L) { \
    luaL_checktype(L, 1, LUA_T ## t1); \
    luaL_checktype(L, 2, LUA_T ## t2); \
    luaL_checktype(L, 3, LUA_T ## t3); \
    lua_push ## tr(L, name(lua_to ## t1(L, 1), lua_to ## t2(L, 2), \
        lua_to ## t3(L, 3))); \
    return 1; \
}

#define PREFIXED_CONST(name, prefix) \
    lua_pushstring(L, #name); \
    lua_pushnumber(L, prefix ## _ ## name); \
    lua_rawset(L, -3);

#define FT_CONST(name) PREFIXED_CONST(name, FT)
#define FTGL_CONST(name) PREFIXED_CONST(name, FTGL)

LUA_FUNC_1(ftglDestroyFont, lightuserdata, void)
LUA_FUNC_2(ftglAttachFile, lightuserdata, string, number)

/*
int ftglAttachData(FTGLfont* font, const unsigned char * data,
                               size_t size);
*/
int lf_ftglAttachData(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    size_t size;
    ustring data = (ustring)lua_tolstring(L, 2, &size);
    lua_pushnumber(L, ftglAttachData(
        lua_touserdata(L, 1), data, size));
    return 1;
}

LUA_FUNC_2(ftglSetFontCharMap, lightuserdata, number, number)
LUA_FUNC_1(ftglGetFontCharMapCount, lightuserdata, number)

/*
FT_Encoding* ftglGetFontCharMapList(FTGLfont* font)
*/
int lf_ftglGetFontCharMapList(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    FTGLfont *font;
    FT_Encoding *charMapList;
    font = lua_touserdata(L, 1);
    unsigned int charMapCount = ftglGetFontCharMapCount(font);
    charMapList = ftglGetFontCharMapList(font);
    lua_newtable(L);
    for (int i = 0; i < charMapCount; i++) {
        lua_pushnumber(L, charMapList[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUA_FUNC_3(ftglSetFontFaceSize, lightuserdata, number, number, number)
LUA_FUNC_1(ftglGetFontFaceSize, lightuserdata, number)
LUA_FUNC_2(ftglSetFontDepth, lightuserdata, number, void)
LUA_FUNC_3(ftglSetFontOutset, lightuserdata, number, number, void)
LUA_FUNC_2(ftglSetFontDisplayList, lightuserdata, number, void)
LUA_FUNC_1(ftglGetFontAscender, lightuserdata, number)
LUA_FUNC_1(ftglGetFontDescender, lightuserdata, number)
LUA_FUNC_1(ftglGetFontLineHeight, lightuserdata, number)

/*
void ftglGetFontBBox(FTGLfont* font, const char *string,
                                 int len, float bounds[6]);
*/
int lf_ftglGetFontBBox(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    size_t len;
    const char *a2 = lua_tolstring(L, 2, &len);
    float bounds[6];
    ftglGetFontBBox(lua_touserdata(L, 1), a2, len, bounds);
    lua_newtable(L);
    for (int i = 0; i < 6; i++) {
        lua_pushnumber(L, bounds[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUA_FUNC_2(ftglGetFontAdvance, lightuserdata, string, number)
LUA_FUNC_3(ftglRenderFont, lightuserdata, string, number, void)
LUA_FUNC_1(ftglGetFontError, lightuserdata, number)
LUA_FUNC_1(ftglCreateBitmapFont, string, lightuserdata)
LUA_FUNC_1(ftglCreateBufferFont, string, lightuserdata)
LUA_FUNC_1(ftglCreateExtrudeFont, string, lightuserdata)
LUA_FUNC_1(ftglCreateOutlineFont, string, lightuserdata)
LUA_FUNC_1(ftglCreatePixmapFont, string, lightuserdata)
LUA_FUNC_1(ftglCreatePolygonFont, string, lightuserdata)
LUA_FUNC_1(ftglCreateTextureFont, string, lightuserdata)
LUA_FUNC_1(ftglDestroyLayout, lightuserdata, void)

/* 
void ftglGetLayoutBBox(FTGLlayout *layout, const char* string,
                                   float bounds[6]);
*/
int lf_ftglGetLayoutBBox(lua_State *L)
{
    luaL_checktype(L, 1, LUA_TLIGHTUSERDATA);
    luaL_checktype(L, 2, LUA_TSTRING);
    FTGLlayout *a1 = lua_touserdata(L, 1);
    const char *a2 = lua_tostring(L, 2);
    float bounds[6];
    ftglGetLayoutBBox(a1, a2, bounds);
    lua_newtable(L);
    for (int i = 0; i < 6; i++) {
        lua_pushnumber(L, bounds[i]);
        lua_rawseti(L, -2, i + 1);
    }
    return 1;
}

LUA_FUNC_3(ftglRenderLayout, lightuserdata, string, number, void)
LUA_FUNC_1(ftglGetLayoutError, lightuserdata, number)
LUA_FUNC_0(ftglCreateSimpleLayout, lightuserdata)
LUA_FUNC_2(ftglSetLayoutFont, lightuserdata, lightuserdata, void)
LUA_FUNC_1(ftglGetLayoutFont, lightuserdata, lightuserdata)
LUA_FUNC_2(ftglSetLayoutLineLength, lightuserdata, number, void)
LUA_FUNC_1(ftglGetLayoutLineLength, lightuserdata, number)
LUA_FUNC_2(ftglSetLayoutAlignment, lightuserdata, number, void)
LUA_FUNC_1(ftglGetLayoutAlignment, lightuserdata, number)
LUA_FUNC_2(ftglSetLayoutLineSpacing, lightuserdata, number, void)

/* http://sourceforge.net/p/ftgl/bugs/35/
LUA_FUNC_1(ftglGetLayoutLineSpacing, lightuserdata, number) */


int luaopen_luaftgl(lua_State *L)
{
    const luaL_Reg api[] = {

        /* FTFont functions (FTGL/FTFont.h) */
        { "destroyFont", lf_ftglDestroyFont },
        { "attachFile", lf_ftglAttachFile },
        { "attachData", lf_ftglAttachData },
        { "setFontCharMap", lf_ftglSetFontCharMap },
        { "getFontCharMapCount", lf_ftglGetFontCharMapCount },
        { "getFontCharMapList", lf_ftglGetFontCharMapList },
        { "setFontFaceSize", lf_ftglSetFontFaceSize },
        { "getFontFaceSize", lf_ftglGetFontFaceSize },
        { "setFontDepth", lf_ftglSetFontDepth },
        { "setFontOutset", lf_ftglSetFontOutset },
        { "setFontDisplayList", lf_ftglSetFontDisplayList },
        { "getFontAscender", lf_ftglGetFontAscender },
        { "getFontDescender", lf_ftglGetFontDescender },
        { "getFontLineHeight", lf_ftglGetFontLineHeight },
        { "getFontBoundingBox", lf_ftglGetFontBBox }, /* added */
        { "getFontBBox", lf_ftglGetFontBBox }, /* original */
        { "getFontAdvance", lf_ftglGetFontAdvance },
        { "renderFont", lf_ftglRenderFont },
        { "getFontError", lf_ftglGetFontError },

        /* FTGL*Font functions (FTGL/FTGL*Font.h) */
        { "createBitmapFont", lf_ftglCreateBitmapFont },
        { "createBufferFont", lf_ftglCreateBufferFont },
        { "createExtrudeFont", lf_ftglCreateExtrudeFont },
        { "createOutlineFont", lf_ftglCreateOutlineFont },
        { "createPixmapFont", lf_ftglCreatePixmapFont },
        { "createPolygonFont", lf_ftglCreatePolygonFont },
        { "createTextureFont", lf_ftglCreateTextureFont },

        /* FTLayout functions (FTGL/FTLayout.h) */
        { "destroyLayout", lf_ftglDestroyLayout },
        { "getLayoutBoundingBox", lf_ftglGetLayoutBBox }, /* added */
        { "getLayoutBBox", lf_ftglGetLayoutBBox }, /* original */
        { "renderLayout", lf_ftglRenderLayout },
        { "getLayoutError", lf_ftglGetLayoutError },

        /* FTSimpleLayout functions (FTGL/FTSimpleLayout.h) */
        { "createSimpleLayout", lf_ftglCreateSimpleLayout },
        { "setLayoutFont", lf_ftglSetLayoutFont },
        { "getLayoutFont", lf_ftglGetLayoutFont },
        { "setLayoutLineLength", lf_ftglSetLayoutLineLength },
        { "getLayoutLineLength", lf_ftglGetLayoutLineLength },
        { "setLayoutAlignment", lf_ftglSetLayoutAlignment },
        { "getLayoutAlignment", lf_ftglGetLayoutAlignment }, /* added */
        { "getLayoutAlignement", lf_ftglGetLayoutAlignment }, /* original */
        { "setLayoutLineSpacing", lf_ftglSetLayoutLineSpacing },
        /* http://sourceforge.net/p/ftgl/bugs/35/
        { "getLayoutLineSpacing", lf_ftglGetLayoutLineSpacing }, */

        { NULL, NULL }
    };

#if LUA_VERSION_NUM == 501
    luaL_register (L, "luaftgl", api);
#else
    luaL_newlib (L, api);
#endif

    /*  FT_Encoding (freetype.h) */
    FT_CONST(ENCODING_NONE)
    FT_CONST(ENCODING_MS_SYMBOL)
    FT_CONST(ENCODING_UNICODE)
    FT_CONST(ENCODING_SJIS)
    FT_CONST(ENCODING_GB2312)
    FT_CONST(ENCODING_BIG5)
    FT_CONST(ENCODING_WANSUNG)
    FT_CONST(ENCODING_JOHAB)
    FT_CONST(ENCODING_MS_SJIS)
    FT_CONST(ENCODING_MS_GB2312)
    FT_CONST(ENCODING_MS_BIG5)
    FT_CONST(ENCODING_MS_WANSUNG)
    FT_CONST(ENCODING_MS_JOHAB)
    FT_CONST(ENCODING_ADOBE_STANDARD)
    FT_CONST(ENCODING_ADOBE_EXPERT)
    FT_CONST(ENCODING_ADOBE_CUSTOM)
    FT_CONST(ENCODING_ADOBE_LATIN_1)
    FT_CONST(ENCODING_OLD_LATIN_2)
    FT_CONST(ENCODING_APPLE_ROMAN)

    /*  FTGL constants */
    FTGL_CONST(RENDER_FRONT)
    FTGL_CONST(RENDER_BACK)
    FTGL_CONST(RENDER_SIDE)
    FTGL_CONST(RENDER_ALL)
    FTGL_CONST(ALIGN_LEFT)
    FTGL_CONST(ALIGN_CENTER)
    FTGL_CONST(ALIGN_RIGHT)
    FTGL_CONST(ALIGN_JUSTIFY)

    return 1;
}

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