在Qt Creator中使用CUDA

要在Qt Creator项目中使用CUDA进行GPU加速计算，你需要进行一些配置。以下是详细步骤：

1. 安装必要软件

安装最新版本的NVIDIA CUDA Toolkit
确保已安装Qt Creator和兼容的编译器(如MSVC或GCC)

2. 创建Qt项目

打开Qt Creator，创建一个新的Qt Console Application或Qt Widgets Application项目
选择适合的编译工具链(MSVC或MinGW)

3. 配置.pro文件

修改项目的.pro文件，添加CUDA支持：

qmake

QT -= guiCONFIG += c++11 console cuda
CONFIG -= app_bundle# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0SOURCES += \main.cpp# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target# 添加CUDA支持
CUDA_SOURCES += your_cuda_file.cu
CUDA_DIR = "C:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v10.2"  # 修改为你的CUDA安装路径# 指定 nvcc 路径（Windows 示例）
win32 {CUDA_NVCC = $$CUDA_DIR/bin/nvcc.exeQMAKE_EXTRA_COMPILERS += cuda
}# 指定CUDA架构
CUDA_ARCH = sm_50  # 根据你的GPU计算能力设置# 添加CUDA包含路径
INCLUDEPATH += $$CUDA_DIR/include# 添加CUDA库路径
win32 {CUDA_LIBS = $$CUDA_DIR/lib/x64
} else {CUDA_LIBS = $$CUDA_DIR/lib64
}# 添加必要的CUDA库
LIBS += -L$$CUDA_LIBS -lcudart -lcuda# 强制使用 nvcc 编译 .cu 文件
cuda.commands = $$CUDA_NVCC -c -arch=$$CUDA_ARCH ${QMAKE_FILE_NAME} -o ${QMAKE_FILE_OUT}
cuda.dependency_type = TYPE_C
cuda.input = CUDA_SOURCES
cuda.output = ${QMAKE_FILE_BASE}.o
QMAKE_EXTRA_COMPILERS += cuda# 强制统一迭代器调试级别
CONFIG(debug, debug|release) {# Debug 配置DEFINES += _ITERATOR_DEBUG_LEVEL=2CUDA_NVCC_FLAGS += -D_ITERATOR_DEBUG_LEVEL=2
} else {# Release 配置DEFINES += _ITERATOR_DEBUG_LEVEL=0CUDA_NVCC_FLAGS += -D_ITERATOR_DEBUG_LEVEL=0
}# MSVC编译器设置
win32-msvc {# 强制使用动态链接（MD/MDd）QMAKE_CXXFLAGS_RELEASE -= -MDQMAKE_CXXFLAGS_RELEASE += -MTQMAKE_CXXFLAGS_DEBUG -= -MTdQMAKE_CXXFLAGS_DEBUG += -MDd# 传递给nvccCUDA_NVCC_FLAGS_RELEASE = -Xcompiler "/MD"CUDA_NVCC_FLAGS_DEBUG = -Xcompiler "/MDd"
}

4. 创建CUDA源文件

在项目中添加一个.cu文件(例如your_cuda_file.cu):

cpp

#include <cuda_runtime.h>
#include <device_launch_parameters.h>__global__ void addKernel(int *c, const int *a, const int *b)
{int i = threadIdx.x;c[i] = a[i] + b[i];
}extern "C" void launchAddKernel(int *c, const int *a, const int *b, int size)
{int *dev_a = 0;int *dev_b = 0;int *dev_c = 0;// 分配GPU内存cudaMalloc((void**)&dev_c, size * sizeof(int));cudaMalloc((void**)&dev_a, size * sizeof(int));cudaMalloc((void**)&dev_b, size * sizeof(int));// 拷贝数据到GPUcudaMemcpy(dev_a, a, size * sizeof(int), cudaMemcpyHostToDevice);cudaMemcpy(dev_b, b, size * sizeof(int), cudaMemcpyHostToDevice);// 启动内核addKernel<<<1, size>>>(dev_c, dev_a, dev_b);// 拷贝结果回CPUcudaMemcpy(c, dev_c, size * sizeof(int), cudaMemcpyDeviceToHost);// 清理cudaFree(dev_a);cudaFree(dev_b);cudaFree(dev_c);
}

5. 在Qt代码中调用CUDA函数

在你的Qt代码中(如main.cpp):

cpp

#include <QCoreApplication>
#include <iostream>extern "C" void launchAddKernel(int *c, const int *a, const int *b, int size);int main(int argc, char *argv[])
{QCoreApplication a(argc, argv);const int arraySize = 5;const int a[arraySize] = {1, 2, 3, 4, 5};const int b[arraySize] = {10, 20, 30, 40, 50};int c[arraySize] = {0};launchAddKernel(c, a, b, arraySize);std::cout << "Result: ";for (int i = 0; i < arraySize; i++) {std::cout << c[i] << " ";}std::cout << std::endl;return a.exec();
}