New rlgl functions and texture can be given as table.

include/lua_core.h

@@ -7,38 +7,33 @@ void luaCallProcess();
 void luaCallDraw();
 void luaCallExit();
 void luaRegister();
-/* Lua Util functions */
+/* Type validators. */
+bool isValidTexture( lua_State *L, int index );
+bool isValidRenderTexture( lua_State *L, int index );
+/* Lua Util functions. */
 Color uluaGetColor( lua_State *L );
-/* Only works with positive index. */
 Color uluaGetColorIndex( lua_State *L, int index );
 Vector2 uluaGetVector2( lua_State *L );
-/* Only works with positive index. */
 Vector2 uluaGetVector2Index( lua_State *L, int index );
 Vector3 uluaGetVector3( lua_State *L );
-/* Only works with positive index. */
 Vector3 uluaGetVector3Index( lua_State *L, int index );
 Vector4 uluaGetVector4( lua_State *L );
-/* Only works with positive index. */
 Vector4 uluaGetVector4Index( lua_State *L, int index );
 Rectangle uluaGetRectangle( lua_State *L );
-/* Only works with positive index. */
 Rectangle uluaGetRectangleIndex( lua_State *L, int index );
 Quaternion uluaGetQuaternion( lua_State *L );
-/* Only works with positive index. */
 Quaternion uluaGetQuaternionIndex( lua_State *L, int index );
 Matrix uluaGetMatrix( lua_State *L );
-/* Only works with positive index. */
 Matrix uluaGetMatrixIndex( lua_State *L, int index );
 BoundingBox uluaGetBoundingBox( lua_State *L );
-/* Only works with positive index. */
 BoundingBox uluaGetBoundingBoxIndex( lua_State *L, int index );
 Ray uluaGetRay( lua_State *L );
-/* Only works with positive index. */
 Ray uluaGetRayIndex( lua_State *L, int index );
 NPatchInfo uluaGetNPatchInfo( lua_State *L );
-/* Only works with positive index. */
 NPatchInfo uluaGetNPatchInfoIndex( lua_State *L, int index );
-
+Texture uluaGetTexture( lua_State *L, int index );
+RenderTexture uluaGetRenderTexture( lua_State *L, int index );
+/* Push types. */
 void uluaPushColor( lua_State *L, Color color );
 void uluaPushVector2( lua_State *L, Vector2 vector );
 void uluaPushVector3( lua_State *L, Vector3 vector );