我正在尝试学习 OpenGL。我使用 Clion 作为 IDE,它使用 CMakeLists.txt 文件来组织/编译项目。
由于某种原因,编译器找不到glClear
:
Undefined symbols for architecture x86_64:
"_glClear", referenced from:
_main in main.cpp.o
"_glClearColor", referenced from:
_main in main.cpp.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make[2]: *** [GraphicsPractice] Error 1
make[1]: *** [CMakeFiles/GraphicsPractice.dir/all] Error 2
make: *** [all] Error 2
我能够成功链接 GLEW
和 GLFW
,但是,当我调用 glClear(GL_COLOR_BUFFER_BIT)
时,我的代码会中断。我不知道为什么。如果有人能帮助我指明正确的方向,那就太好了。
CMakeList.txt
cmake_minimum_required(VERSION 3.6)
project(GraphicsPractice)
set(CMAKE_CXX_STANDARD 14)
set(SOURCE_FILES src/main.cpp)
set(GLFW_BUILD_DOCS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_TESTS OFF CACHE BOOL "" FORCE)
set(GLFW_BUILD_EXAMPLES OFF CACHE BOOL "" FORCE)
add_subdirectory(deps/glfw)
find_package(OpenGl REQUIRED)
find_package(GLEW REQUIRED)
include_directories("deps/glfw/include/")
add_executable(${PROJECT_NAME} ${SOURCE_FILES})
target_link_libraries(${PROJECT_NAME} glfw glew)
main.cpp
#define GLEW_STATIC
#include <GL/glew.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
int main() {
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
GLFWwindow* window = glfwCreateWindow(800, 600, "OpenGL", 0, nullptr);
glfwMakeContextCurrent(window);
glewExperimental = GL_TRUE;
glewInit();
while (!glfwWindowShouldClose(window)) {
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
glfwSwapBuffers(window);
glfwPollEvents();
}
glfwTerminate();
return 0;
}
最佳答案
您需要链接 OpenGL 库。即:
target_link_libraries(${PROJECT_NAME} ${OPENGL_LIBRARIES} glfw glew 等...)
关于c++ - 学习OpenGL时找不到glClear,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42498660/