Function RenderScript_RenderTarget

engine/render/src/render/render_script.cpp:901–1075

creates a new render target * Creates a new render target according to the supplied * specification table. * * The table should contain keys specifying which buffers should be created * with what parameters. Each buffer key should have a table value consisting * of parameters. The following parameter keys are available: * * Key | Values

     *
     */
    int RenderScript_RenderTarget(lua_State* L)
    {
        DM_LUA_STACK_CHECK(L, 1);

        RenderScriptInstance* i = RenderScriptInstance_Check(L);

        // Legacy support
        int table_index = 2;
        if (lua_istable(L, 1))
        {
            table_index = 1;
        }

        const char* required_keys[] = { "format", "width", "height" };
        const int required_keys_count = sizeof(required_keys) / sizeof(required_keys[0]);
        uint32_t buffer_type_flags = 0;
        luaL_checktype(L, table_index, LUA_TTABLE);

        dmGraphics::RenderTargetCreationParams params = {};

        lua_pushnil(L);                     // [-0,+1 = 1] first key
        while (lua_next(L, table_index))    // [-1,+2 = 2] pop key, push key-value (buffer_type and table)
        {
            dmGraphics::BufferType buffer_type    = CheckBufferType(L, -2);
            buffer_type_flags                    |= (uint32_t) buffer_type;
            dmGraphics::TextureParams* p          = 0;
            dmGraphics::TextureCreationParams* cp = 0;
            lua_Integer width                     = 0;
            lua_Integer height                    = 0;

            if (dmGraphics::IsColorBufferType(buffer_type))
            {
                uint32_t color_index = dmGraphics::GetBufferTypeIndex(buffer_type);
                p  = &params.m_ColorBufferParams[color_index];
                cp = &params.m_ColorBufferCreationParams[color_index];

                params.m_ColorBufferLoadOps[color_index]  = dmGraphics::ATTACHMENT_OP_DONT_CARE;
                params.m_ColorBufferStoreOps[color_index] = dmGraphics::ATTACHMENT_OP_STORE;
            }
            else if (buffer_type == dmGraphics::BUFFER_TYPE_DEPTH_BIT)
            {
                p  = &params.m_DepthBufferParams;
                cp = &params.m_DepthBufferCreationParams;
            }
            else if (buffer_type == dmGraphics::BUFFER_TYPE_STENCIL_BIT)
            {
                p  = &params.m_StencilBufferParams;
                cp = &params.m_StencilBufferCreationParams;
            }
            else
            {
                lua_pop(L, 2); // [-2,+0 = 0] pop key-value pair
                return DM_LUA_ERROR("Invalid buffer type supplied to %s.render_target: (%d)", RENDER_SCRIPT_LIB_NAME, (uint32_t) buffer_type);
            }

            luaL_checktype(L, -1, LUA_TTABLE);

            // Verify that required keys are supplied