Question

我是OpenGL的新手，我现在正在尝试书中的例子，我已经正确地包含了所有库，但似乎仍然有些事情不对。

两个库：freeglut_static.lib gltools.lib包含在项目中。

这是代码：

// Triangle.cpp
// Our first OpenGL program that will just draw a triangle on the screen.
#include <GLTools.h> // OpenGL toolkit
#include <GLShaderManager.h> // Shader Manager Class
#ifdef __APPLE__
#include <glut/glut.h> // OS X version of GLUT
#else
#define FREEGLUT_STATIC
#include <GL/glut.h> // Windows FreeGlut equivalent
#endif
GLBatch triangleBatch;
GLShaderManager shaderManager;
///////////////////////////////////////////////////////////////////////////////
// Window has changed size, or has just been created. In either case, we need
// to use the window dimensions to set the viewport and the projection matrix.
void ChangeSize(int w, int h)
{
    glViewport(0, 0, w, h);
}
///////////////////////////////////////////////////////////////////////////////
// This function does any needed initialization on the rendering context.
// This is the first opportunity to do any OpenGL related tasks.
void SetupRC()
{
    // Blue background
    glClearColor(0.0f, 0.0f, 1.0f, 1.0f );
    shaderManager.InitializeStockShaders();
    // Load up a triangle
    GLfloat vVerts[] = { -0.5f, 0.0f, 0.0f,
        0.5f, 0.0f, 0.0f,
        0.0f, 0.5f, 0.0f };
    triangleBatch.Begin(GL_TRIANGLES, 3);
    triangleBatch.CopyVertexData3f(vVerts);
    triangleBatch.End();
}
///////////////////////////////////////////////////////////////////////////////
// Called to draw scene
void RenderScene(void)
{
    // Clear the window with current clearing color
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
    GLfloat vRed[] = { 1.0f, 0.0f, 0.0f, 1.0f };
    shaderManager.UseStockShader(GLT_SHADER_IDENTITY, vRed);
    triangleBatch.Draw();
    // Perform the buffer swap to display the back buffer
    glutSwapBuffers();
}

///////////////////////////////////////////////////////////////////////////////
// Main entry point for GLUT based programs
int main(int argc, char* argv[])
{
    gltSetWorkingDirectory(argv[0]);
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA | GLUT_DEPTH | GLUT_STENCIL);
    glutInitWindowSize(800, 600);
    glutCreateWindow(“Triangle”);
    glutReshapeFunc(ChangeSize);
    glutDisplayFunc(RenderScene);
    GLenum err = glewInit();
    if (GLEW_OK != err) {
        fprintf(stderr, “GLEW Error: %s\n”, glewGetErrorString(err));
        return 1;
    }
    SetupRC();
    glutMainLoop();
    return 0;
}

错误消息：

 1>Linking...
1>LINK : warning LNK4098: defaultlib 'LIBCMT' conflicts with use of other libs; use /NODEFAULTLIB:library
1>LINK : warning LNK4098: defaultlib 'LIBCMTD' conflicts with use of other libs; use /NODEFAULTLIB:library
1>Triangle.obj : error LNK2019: unresolved external symbol _glewGetErrorString@4 referenced in function _main
1>Triangle.obj : error LNK2019: unresolved external symbol _glewInit@0 referenced in function _main
1>D:\XING BIZHOU\project\openglproj\Debug\openglproj.exe : fatal error LNK1120: 2 unresolved externals
1>Build log was saved at "file://d:\XING BIZHOU\project\openglproj\openglproj\Debug\BuildLog.htm"
1>openglproj - 3 error(s), 2 warning(s)

Answer 1

unresolved external symbol _glewGetErrorString

这意味着编译器未在您的环境中找到glew32库。尝试安装它并确保它在LDPATH中，以便编译器可以看到它。

Answer 2

您输入了图书馆吗？在项目/属性/链接器/输入/附加依赖项

中

Opengl代表性令人难以置信的错误源代码：绘制三角形库

2 个答案: