Direct3D 11 Devices之 Software Layers(软件层)

本文详细介绍了Direct3D11运行时的分层结构,包括核心层和调试层的功能与作用。核心层负责基本功能实现,而调试层则提供额外的参数和一致性验证,有助于开发者在发布前检测和修复错误。

本文只是对官方文档做出简单的翻译 原文地址:Software Layers

Direct3D 11运行时是分层构造的,从核心的基本功能开始,在外部层中构建可选的功能和开发人员辅助功能。

通常,图层(layers)会添加功能(functionality),但不会修改现有行为。 例如,核心功能(core functions)将具有相同的返回值,而与要实例化的调试层无关,尽管如果实例化调试层,则可能会提供其他调试输出。

要在创建设备时创建图层(layers),请调用D3D11CreateDeviceD3D11CreateDeviceAndSwapChain并提供一个或多个D3D11_CREATE_DEVICE_FLAG值。

核心层(Core Layer)

核心层默认存在。在API和设备驱动程序之间提供映射,从而最大程度地减少了高频调用的开销。由于核心层对于性能至关重要,因此它仅执行关键验证。其余层是可选的。

调试层(Debug Layer)

调试层提供了广泛的附加参数和一致性验证(例如,验证着色器链接和资源绑定,验证参数一致性以及报告错误描述)。

若要创建支持调试层的设备,必须安装DirectX SDK(以获取D3D11SDKLayers.dll),然后在调用D3D11CreateDevice函数或D3D11CreateDeviceAndSwapChain函数时指定D3D11_CREATE_DEVICE_DEBUG标志。如果在启用调试层的情况下运行应用程序,则该应用程序的运行速度将大大降低。但是,要确保在发布应用程序之前清除其错误和警告,请使用调试层。有关更多信息,请参阅Using the debug layer to debug apps

或者,您可以使用DirectX SDK附带的DirectX控制面板启用/禁用调试标志

当调试层列出内存泄漏时,它将输出对象接口指针及其友好名称的列表。 默认的友好名称是“ ”。 您可以使用ID3D11DeviceChild :: SetPrivateData方法和D3Dcommon.h中的WKPDID_D3DDebugObjectName GUID来设置友好名称。

例如,要使用SDKLayer名称为mytexture.jpg来命名pTexture,请使用以下代码:

const char c_szName[] = "mytexture.jpg";
pTexture->SetPrivateData( WKPDID_D3DDebugObjectName, sizeof( c_szName ) - 1, c_szName );
### ST7789 Display Driver Software For the ST7789 display, multiple platforms and frameworks support its operation through various drivers. Below is a detailed explanation focusing on two specific contexts provided. #### ESP32 with LVGL under ESP-IDF Framework The integration of an ST7789 screen into projects using the ESP32 microcontroller can be achieved by leveraging the Littlev Graphics Library (LVGL). This library offers comprehensive graphical interface capabilities that are well-suited for embedded systems like those based on ESP32. To set up such a system within the ESP-IDF framework involves configuring SPI communication parameters specifically tailored to match the requirements of the ST7789 panel[^1]. ```c // Example configuration snippet for initializing SPI bus connected to ST7789 static spi_bus_config_t buscfg={ .mosi_io_num=PIN_NUM_MOSI, .miso_io_num=PIN_NUM_MISO, .sclk_io_num=PIN_NUM_CLK, }; spi_device_interface_config_t devcfg={ .command_bits=8, .address_bits=0, .dummy_bits=0, .mode=0, .duty_cycle_pos=128, .cs_ena_pretrans=5, .cs_ena_posttrans=5, }; ``` This setup ensures proper initialization of hardware resources necessary for driving commands and data transfers between the controller chip and the LCD module. #### NanoPi NEO Utilizing FBTFT Kernel Module Another approach seen in practice includes utilizing Linux-based boards like FriendlyARM's NanoPi series where framebuffer devices combined with custom kernel modules provide direct access to low-level graphics operations without needing additional libraries or middleware layers above them. Specifically mentioned here is `fbtft`, which serves as a generic driver capable of supporting numerous types of TFT displays including models driven by controllers similar to what powers this particular model from Sitronix Technology Corporation[^2]. ```bash # Command line instruction to load fbtft device along with relevant options targeting ST7789V variant modprobe fbtft_device name=st7789v width=240 height=240 bgr=1 txbuflen=32768 speed=48000000 fps=60 gpios=dc:15 reset:18 cs:17 rotate=90 ``` Such configurations allow developers to quickly bring up basic functionality while also providing flexibility when it comes time to customize further according to project needs beyond simple backlight control or orientation adjustments. --related questions-- 1. What modifications would one need to make if switching from SPI mode to 8-bit parallel interface? 2. How does changing pixel formats impact performance metrics during image rendering processes? 3. Can these setups accommodate touch input mechanisms alongside visual output functionalities? 4. Are there any known limitations regarding color depth settings supported natively out-of-the-box versus programmatically altered post-initialization?
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