本教程小编和大家分享 Windows 7 系统电脑安装RNDIS驱动的正确方法，RNDIS驱动是什么？ Windows 7 系统驱动RNDIS是远端网络驱动接口协议，设备通过USB方式同主机连接，模拟网络连接以便用于下载和调试工作。但是很多 Windows 7 系统用户安装RNDIS的设备时失败，遇到无法安装的问题，所以小编给大家介绍 Windows 7 系统电脑安装RNDIS驱动的正确方法。
月度归档： 2019 年 4 月
粗略判断Shader每条代码的成本
GPU IS a processor (graphics proccessing unit). Anywho, i remember seeing somewhere that in geforce 6 series cards its a signle cycle (maybe i was just dreaming :-p) but i have that memory
radeon x800 has it anyways
EDIT:
Quote:
ORIGINALLY AT: http://gear.ibuypower.com/GVE/Store/ProductDetails.aspx?sku=VC-POWERC-147
Smartshader HD•Support for Microsoft® DirectX® 9.0 programmable vertex and pixel shaders in hardware
• DirectX 9.0 Vertex Shaders
- Vertex programs up to 65,280 instructions with flow control
- Single cycle trigonometric operations (SIN & COS)
• Direct X 9.0 Extended Pixel Shaders
- Up to 1,536 instructions and 16 textures per rendering pass
- 32 temporary and constant registers
- Facing register for two-sided lighting
- 128-bit, 64-bit & 32-bit per pixel floating point color formats
- Multiple Render Target (MRT) support
• Complete feature set also supported in OpenGL® via extensions
Android Gradle Plugin源码解析之externalNativeBuild
在Android Studio 2.2开始的Android Gradle Plugin版本中，Google集成了对cmake的完美支持，而原先的ndkBuild的方式支持也变得更加良好。这篇文章就来说说Android Gradle Plugin与交叉编译之间的一些事，即externalNativeBuild相关的task，主要是解读一下gradle构建系统相关的源码。
Overriding a default option(…) value in CMake from a parent CMakeLists.txt
子 CMakeLists.txt
option(BUILD_FOR_ANDROID "Build For Android" OFF)
if(SYSTEM.Android AND NOT BUILD_FOR_ANDROID)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${NATIVE_LIBRARY_OUTPUT}/${ANDROID_ABI})
endif()
父 CMakeLists.txt
set(BUILD_FOR_ANDROID ON)
add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)
执行如下命令的时候：
/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/cmake --trace-expand \ -H/Users/xxxx/Source/example/demo/android/app \ -B/Users/xxxx/Source/example/demo/android/app/.externalNativeBuild/cmake/debug/arm64-v8a \ -DANDROID_ABI=arm64-v8a \ -DANDROID_PLATFORM=android-21 \ -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=/Users/xxxx/Source/example/demo/android/app/build/intermediates/cmake/debug/obj/arm64-v8a \ -DCMAKE_BUILD_TYPE=Debug \ -DANDROID_NDK=/Users/xxxx/Library/Android/android-ndk-r16b \ -DCMAKE_TOOLCHAIN_FILE=/Users/xxxx/Library/Android/android-ndk-r16b/build/cmake/android.toolchain.cmake \ -DCMAKE_MAKE_PROGRAM=/Users/xxxx/Library/Android/sdk/cmake/3.6.4111459/bin/ninja \ -G"Android Gradle - Ninja" \ -DANDROID_ARM_NEON=TRUE \ -DANDROID_TOOLCHAIN=gcc \ -DANDROID_PLATFORM=android-21 \ -DANDROID_STL=gnustl_shared
会观察到生成的配置文件中 BUILD_FOR_ANDROID 不一定能生效。
需要如下配置才行：
父 CMakeLists.txt
set(BUILD_FOR_ANDROID ON CACHE BOOL "" FORCE)
add_subdirectory(${CHILD_ROOT_DIR}/ ${CMAKE_CURRENT_SOURCE_DIR}/build)
参考链接
Use ccache with CMake for faster compilation
C and C++ compilers aren’t the fastest pieces of software out there and there’s no lack of programmer jokes based on tedium of waiting for their work to complete.
There are ways to fix the pain though - one of them is ccache. CCache improves compilation times by caching previously built object files in private cache and reusing them when you’re recompiling same objects with same parameters. Obviously it will not help if you’re compiling the code for the first time and it also won’t help if you often change compilation flags. Most C/C++ development however involves recompiling same object files with the same parameters and ccache helps alot.
For illustration, here’s the comparison of first and subsequent compilation times of a largish C++ project:
Original run with empty cache:
$ make -j9 ... real 0m56.684s user 5m31.996s sys 0m41.638s
Recompilation with warm cache:
$ make -j9 ... real 0m5.929s user 0m11.896s sys 0m8.722s
Installation
CCache is available in repositories on pretty much all distributions. On OS X use homebrew:
$ brew install ccache
and on Debian-based distros use apt:
$ apt-get install ccache
CMake configuration
After ccache is installed, you need to tell CMake to use it as a wrapper for the compiler. Add these lines to your CMakeLists.txt:
# Configure CCache if available
find_program(CCACHE_FOUND ccache)
if(CCACHE_FOUND)
set_property(GLOBAL PROPERTY RULE_LAUNCH_COMPILE ccache)
set_property(GLOBAL PROPERTY RULE_LAUNCH_LINK ccache)
endif(CCACHE_FOUND)
Rerun cmake and next make should use ccache for wrapper.
Usage with Android NDK
CCache can even be used on Android NDK - you just need to export NDK_CCACHE environment variable with path to ccache binary. ndk-build script will automatically use it. E.g.
$ export NDK_CCACHE=/usr/local/bin/ccache $ ndk-build -j9
(Note that on Debian/Ubuntu the path will probably be /usr/bin/ccache)
CCache statistics
To see if ccache is really working, you can use ccache -s command, which will display ccache statistics:
cache directory /Users/jernej/.ccache primary config /Users/jernej/.ccache/ccache.conf secondary config (readonly) /usr/local/Cellar/ccache/3.2.2/etc/ccache.conf cache hit (direct) 77826 cache hit (preprocessed) 17603 cache miss 46999 called for link 18 compile failed 45 ccache internal error 1 preprocessor error 62 unsupported source language 204 files in cache 48189 cache size 1.2 GB max cache size 20.0 GB
On second and all subsequent compilations the “cache hit” values should increase and thus show that ccache is working.