发现一个写的比较好的基于Vulkan的GPGPU计算框架Vuh，github上的代码地址为：
https://github.com/Glavnokoman/vuh.git
在macOS Mojave(10.14.2) 中编译方式：
$ git clone https://github.com/Glavnokoman/vuh.git $ cd vuh/config $ pip install --user cget $ export PATH=/Users/`whoami`/Library/Python/2.7/bin:$PATH $ export CGET_PREFIX=. # 安装Vulkan相关依赖库 $ bash install_dependencies.sh # 指定Vulkan相关环境变量，后续的CMake文件中的FindVulkan.cmake会使用这个 $ export VULKAN_SDK=`pwd` # 我们刚刚安装的Catch2的路径，CMake需要 $ export Catch2_DIR=`pwd`/lib/cmake/Catch2 $ export ARGS=-DCatch2_DIR=$Catch2_DIR # 安装其他依赖 $ brew install spdlog $ brew install doxygen $ cd .. $ mkdir build $ cd build $ cmake .. $ARGS $ make
如果编译的时候报错
Scanning dependencies of target vuh_example_spdlog
[ 60%] Building CXX object doc/examples/spdlog/CMakeFiles/vuh_example_spdlog.dir/main.cpp.o
/Users/xxx/Source/vuh/doc/examples/spdlog/main.cpp:14:27: error: no member named
'basic_logger_mt' in namespace 'spdlog'
static auto logger = spd::basic_logger_mt("logger", "vuh.log");
~~~~~^
1 error generated.
make[2]: *** [doc/examples/spdlog/CMakeFiles/vuh_example_spdlog.dir/main.cpp.o] Error 1
make[1]: *** [doc/examples/spdlog/CMakeFiles/vuh_example_spdlog.dir/all] Error 2
make: *** [all] Error 2
这个原因是由于新版本的spdlog-1.2.1变更了basic_logger_mt这个类的头文件。
在源代码的vuh/doc/examples/spdlog/main.cpp中，包含如下头文件即可：
#include <spdlog/sinks/basic_file_sink.h>
如果需要编译 Android 版本，那么如下方式进行编译：
$ git clone https://github.com/Glavnokoman/vuh.git $ cd vuh/config $ pip install --user cget $ export PATH=/Users/`whoami`/Library/Python/2.7/bin:$PATH $ export CGET_PREFIX=. # 安装Vulkan相关依赖库 $ bash install_dependencies.sh $ export ANDROID_NDK_HOME=~/Library/Android/sdk/ndk-bundle $ cd .. $ mkdir build $ cd build $ cmake .. \ -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake \ -DANDROID_ABI="armeabi-v7a" \ -DCMAKE_BUILD_TYPE=Release \ -DANDROID_STL=c++_static \ -DANDROID_NATIVE_API_LEVEL=android-24 \ -DANDROID_TOOLCHAIN=clang \ -DVUH_BUILD_TESTS=OFF \ -DVUH_BUILD_DOCS=OFF \ -DVUH_BUILD_EXAMPLES=OFF \ -DCMAKE_CXX_FLAGS="-DVK_USE_PLATFORM_ANDROID_KHR=1 -DVULKAN_HPP_TYPESAFE_CONVERSION=1 -I$ANDROID_NDK_HOME/sources/third_party/vulkan/src/include/" # 最后生成 libvuh.so ，然后自己写代码调用这个库即可，简单的直接修改代码中的例子即可 $ make
注意最后几个参数，文档，测试用例，例子都不参与编译，原因在于这几个工程不适合 Android 上运行，最后需要定义几个 C++ 的编译宏，否则编译不通过。
如果上面编译的时候，提示如下错误信息：
[ 20%] Building CXX object src/CMakeFiles/vuh.dir/instance.cpp.o
vuh/src/instance.cpp:127:33: error: incompatible operand
types ('vuh::debug_reporter_t' (aka 'unsigned int (*)(unsigned int,
VkDebugReportObjectTypeEXT, unsigned long long, unsigned int, int, const
char *, const char *, void *) __attribute__((pcs("aapcs-vfp")))') and
'auto (*)(VkDebugReportFlagsEXT, VkDebugReportObjectTypeEXT, uint64_t,
size_t, int32_t, const char *, const char *, void *) -> VkBool32' (aka
'auto (*)(unsigned int, VkDebugReportObjectTypeEXT, unsigned long long,
unsigned int, int, const char *, const char *, void *) -> unsigned int'))
, _reporter(report_callback ? report_callback : debugReporter)
^ ~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~
vuh/src/instance.cpp:128:49: warning: field '_reporter' is
uninitialized when used here [-Wuninitialized]
, _reporter_cbk(registerReporter(_instance, _reporter))
^
1 warning and 1 error generated.
make[2]: *** [src/CMakeFiles/vuh.dir/instance.cpp.o] Error 1
make[1]: *** [src/CMakeFiles/vuh.dir/all] Error 2
make: *** [all] Error 2
这个错误的原因是 vuh/src/instance.cpp 中定义
/// Default debug reporter used when user did not care to provide his own.
static auto debugReporter(
VkDebugReportFlagsEXT , VkDebugReportObjectTypeEXT, uint64_t, size_t, int32_t
, const char* pLayerPrefix
, const char* pMessage
, void* /*pUserData*/
)-> VkBool32
{
std::cerr << "[Vulkan]:" << pLayerPrefix << ": " << pMessage << "\n";
return VK_FALSE;
}
的时候，缺少 VKAPI_ATTR 这个宏。貌似只有在 Android 平台上这个宏被赋值，其他平台都是空。因此其他平台编译的时候，没有这个参数也是没问题的。
修改后的结果为：
/// Default debug reporter used when user did not care to provide his own.
static auto VKAPI_ATTR debugReporter(
VkDebugReportFlagsEXT , VkDebugReportObjectTypeEXT, uint64_t, size_t, int32_t
, const char* pLayerPrefix
, const char* pMessage
, void* /*pUserData*/
)-> VkBool32
{
std::cerr << "[Vulkan]:" << pLayerPrefix << ": " << pMessage << "\n";
return VK_FALSE;
}
VKAPI_ATTR 这个宏在 vk_platform.h这个文件中被定义，定义的具体内容如下：
/*
***************************************************************************************************
* Platform-specific directives and type declarations
***************************************************************************************************
*/
/* Platform-specific calling convention macros.
*
* Platforms should define these so that Vulkan clients call Vulkan commands
* with the same calling conventions that the Vulkan implementation expects.
*
* VKAPI_ATTR - Placed before the return type in function declarations.
* Useful for C++11 and GCC/Clang-style function attribute syntax.
* VKAPI_CALL - Placed after the return type in function declarations.
* Useful for MSVC-style calling convention syntax.
* VKAPI_PTR - Placed between the '(' and '*' in function pointer types.
*
* Function declaration: VKAPI_ATTR void VKAPI_CALL vkCommand(void);
* Function pointer type: typedef void (VKAPI_PTR *PFN_vkCommand)(void);
*/
#if defined(_WIN32)
// On Windows, Vulkan commands use the stdcall convention
#define VKAPI_ATTR
#define VKAPI_CALL __stdcall
#define VKAPI_PTR VKAPI_CALL
#elif defined(__ANDROID__) && defined(__ARM_ARCH) && __ARM_ARCH < 7
#error "Vulkan isn't supported for the 'armeabi' NDK ABI"
#elif defined(__ANDROID__) && defined(__ARM_ARCH) && __ARM_ARCH >= 7 && defined(__ARM_32BIT_STATE)
// On Android 32-bit ARM targets, Vulkan functions use the "hardfloat"
// calling convention, i.e. float parameters are passed in registers. This
// is true even if the rest of the application passes floats on the stack,
// as it does by default when compiling for the armeabi-v7a NDK ABI.
#define VKAPI_ATTR __attribute__((pcs("aapcs-vfp")))
#define VKAPI_CALL
#define VKAPI_PTR VKAPI_ATTR
#else
// On other platforms, use the default calling convention
#define VKAPI_ATTR
#define VKAPI_CALL
#define VKAPI_PTR
#endif