Function RenderScript_Draw

engine/render/src/render/render_script.cpp:1720–1809

draws all objects matching a predicate * Draws all objects that match a specified predicate. An optional constant buffer can be * provided to override the default constants. If no constants buffer is provided, a default * system constants buffer is used containing constants as defined in materials and set through * [ref:go.set] (or [ref:particlefx.set_constant]) on visual compo

     * ```
     */
    int RenderScript_Draw(lua_State* L)
    {
        RenderScriptInstance* i = RenderScriptInstance_Check(L);
        HPredicate predicate = 0x0;
        if (lua_isuserdata(L, 1))
        {
            HPredicate* tmp = RenderScriptPredicate_Check(L, 1);
            predicate = *tmp;
        }
        else
        {
            return luaL_error(L, "No render predicate specified.");
        }

        dmVMath::Matrix4* frustum_matrix = 0;
        dmRender::FrustumPlanes frustum_num_planes = dmRender::FRUSTUM_PLANES_SIDES;
        HNamedConstantBuffer constant_buffer = 0;
        dmRender::SortOrder sort_order = dmRender::SORT_UNSPECIFIED;

        bool has_options_table = lua_istable(L, 2);
        if (lua_gettop(L) >=2 && !has_options_table)
        {
            return luaL_error(L, "Invalid argument #2 type. Should be table or nil");
        }
        bool has_constant_buffer_value = false;

        if (has_options_table)
        {
            luaL_checktype(L, 2, LUA_TTABLE);
            lua_pushvalue(L, 2);
            int options_index = lua_gettop(L);

            lua_getfield(L, options_index, "frustum");
            frustum_matrix = lua_isnil(L, -1) ? 0 : dmScript::CheckMatrix4(L, -1);
            lua_pop(L, 1);

            lua_getfield(L, options_index, "frustum_planes");
            frustum_num_planes = lua_isnil(L, -1) ? frustum_num_planes : (dmRender::FrustumPlanes)luaL_checkinteger(L, -1);
            lua_pop(L, 1);

            lua_getfield(L, options_index, "constants");
            if (!lua_isnil(L, -1))
            {
                constant_buffer = *RenderScriptConstantBuffer_Check(L, -1);
                has_constant_buffer_value = true;
            }

            lua_getfield(L, options_index, "sort_order");
            if (!lua_isnil(L, -1))
            {
                sort_order = (dmRender::SortOrder) luaL_checkinteger(L, -1);
            }
            lua_pop(L, 1);
        }

        // we need to pass ownership to the command queue
        FrustumOptions* frustum_options = 0;
        if (frustum_matrix)