学习OpenGL时找不到Glclear

Cannot find glClear while learning OpenGL

本文关键字：Glclear 找不到 OpenGL 学习      更新时间：2023-10-16

我正在尝试学习OpenGL。我正在使用clion作为IDE，它使用cmakelists.txt文件来组织/编译项目。

由于某种原因，编译器无法找到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，我的代码会断开。我不确定为什么。如果有人可以帮助我朝正确的方向指向，那将是很棒的。

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;
}

您需要链接OpenGL库。即：

target_link_libraries(${PROJECT_NAME} ${OPENGL_LIBRARIES} glfw glew etc...)

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