Added a basic texture library

Bonus: you can "nil" a texture to destroy it !

source/gfx.c

@@ -6,6 +6,7 @@
 
 int load_color_lib(lua_State *L);
 int load_font_lib(lua_State *L);
+int load_texture_lib(lua_State *L);
 
 u32 color_default;
 sftd_font *font_default;
@@ -144,8 +145,9 @@ struct { char *name; int value; } gfx_constants[] = {
 
 // Subtables
 struct { char *name; int (*load)(lua_State *L); } gfx_libs[] = {
-	{ "color", load_color_lib },
+	{ "color",   load_color_lib   },
-	{ "font",  load_font_lib  },
+	{ "font",    load_font_lib    },
+	{ "texture", load_texture_lib },
 	{ NULL, NULL }
 };
 

source/texture.c

@@ -0,0 +1,108 @@
+#include <sf2d.h>
+#include <sfil.h>
+
+#include <lapi.h>
+#include <lauxlib.h>
+
+typedef struct {
+	sf2d_texture *texture;
+	//u32 blendColor = 0xffffffff;
+} texture_userdata;
+
+u8 getType(const char *name) {
+	// NYI, always return the PNG type, because PNG is the best type.
+	return 0;
+}
+
+// module functions
+static int texture_load(lua_State *L) {
+	const char *path = luaL_checkstring(L, 1);
+	u8 place = luaL_checkinteger(L, 2);
+	u8 type = luaL_optinteger(L, 3, 3); //type 3 is "search at the end of the filename"
+
+	texture_userdata *texture;
+	texture = (texture_userdata *)lua_newuserdata(L, sizeof(*texture));
+	
+	luaL_getmetatable(L, "LTexture");
+	lua_setmetatable(L, -2);
+	
+	if (type==3) type = getType(path);
+	if (type==0) { //PNG
+		texture->texture = sfil_load_PNG_file(path, place);
+	} else if (type==1) { //JPEG
+		texture->texture = sfil_load_JPEG_file(path, place);
+	} else if (type==2) { //BMP
+		texture->texture = sfil_load_BMP_file(path, place);
+	} else {
+		lua_pushnil(L);
+		lua_pushstring(L, "Bad type");
+		return 2;
+	}
+	
+	return 1;
+}
+
+static int texture_draw(lua_State *L) {
+	texture_userdata *texture = luaL_checkudata(L, 1, "LTexture");
+	int x = luaL_checkinteger(L, 2);
+	int y = luaL_checkinteger(L, 3);
+	
+	sf2d_draw_texture(texture->texture, x, y);
+	
+	return 0;
+}
+
+static int texture_unload(lua_State *L) {
+	texture_userdata *texture = luaL_checkudata(L, 1, "LTexture");
+	
+	if (texture->texture != NULL) sf2d_free_texture(texture->texture);
+	texture->texture = NULL;
+	
+	return 0;
+}
+
+// object
+static const struct luaL_Reg texture_methods[] = {
+	{"draw",    texture_draw  },
+	{"destroy", texture_unload},
+	{"__gc",    texture_unload},
+	{NULL, NULL}
+};
+
+// module
+static const struct luaL_Reg texture_functions[] = {
+	{"load", texture_load},
+	{NULL, NULL}
+};
+
+// constants
+struct { char *name; int value; } texture_constants[] = {
+	{"PLACE_RAM",  0},
+	{"PLACE_VRAM", 1},
+	{"PLACE_TEMP", 2},
+	{"TYPE_PNG",   0},
+	{"TYPE_JPEG",  1},
+	{"TYPE_BMP",   2},
+	{NULL, 0}
+};
+
+int luaopen_texture_lib(lua_State *L) {
+	luaL_newmetatable(L, "LTexture");
+	lua_pushvalue(L, -1);
+	lua_setfield(L, -2, "__index");
+	luaL_setfuncs(L, texture_methods, 0);
+	
+	luaL_newlib(L, texture_functions);
+	
+	for (int i = 0; texture_constants[i].name; i++) {
+		lua_pushinteger(L, texture_constants[i].value);
+		lua_setfield(L, -2, texture_constants[i].name);
+	}
+	
+	return 1;
+}
+
+void load_texture_lib(lua_State *L) {
+	luaL_requiref(L, "ctr.gfx.texture", luaopen_texture_lib, false);
+}
+