我正在尝试将glew和glut标志添加到cmd行中，以正确地编译程序。
没有GLEW和GLUT的代码：
#include <GLFW/glfw3.h>
#include <iostream>
#include <stdio.h>
using namespace std;
int main(void)
{
GLFWwindow* window;
/* Initialize the library */
if (!glfwInit())
return -1;
/* Create a windowed mode window and its OpenGL context */
window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
if (!window)
{
glfwTerminate();
return -1;
}
/* Make the window's context current */
glfwMakeContextCurrent(window);
/* Loop until the user closes the window */
while (!glfwWindowShouldClose(window))
{
/* Render here */
glClear(GL_COLOR_BUFFER_BIT);
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.5f);
glVertex2f(0.0f, 0.5f);
glVertex2f(0.5f, -0.5f);
glEnd();
/* Swap front and back buffers */
glfwSwapBuffers(window);
/* Poll for and process events */
glfwPollEvents();
}
glfwTerminate();
return 0;
}
使用以下命令运行它：
g++ openGL.cpp -lglfw3 -framework Cocoa -framework OpenGL -framework
IOKit -framework CoreVideo
工作并绘制一个三角形。添加include glew和glut语句：
#include <GL/glew.h>
#include <GL/glut.h>
，并改用此命令：
g++ openGL.cpp -lglfw3 -framework Cocoa -framework OpenGL -framework
IOKit -framework CoreVideo -lglut -lGLU -lGL -lGLEW
使编译器放弃20多个错误并放弃。
完整的错误消息：
In file included from openGL.cpp:9:
In file included from ./openGL.hpp:12:
/usr/local/include/GL/glew.h:85:2: error: gl.h included before glew.h
#error gl.h included before glew.h
^
/usr/local/include/GL/glew.h:91:2: error: gltypes.h included before glew.h
#error gltypes.h included before glew.h
^
/usr/local/include/GL/glew.h:6586:22: error: typedef redefinition with different
types ('unsigned int' vs 'void *')
typedef unsigned int GLhandleARB;
^
/System/Library/Frameworks/OpenGL.framework/Headers/gltypes.h:28:18: note:
previous definition is here
typedef void *GLhandleARB;
^
In file included from openGL.cpp:9:
In file included from ./openGL.hpp:12:
/usr/local/include/GL/glew.h:19860:17: error: unknown type name
'PFNGLCOPYTEXSUBIMAGE3DPROC'; did you mean 'PFNGLCOPYTEXSUBIMAGE3DNVPROC'?
GLEW_FUN_EXPORT PFNGLCOPYTEXSUBIMAGE3DPROC __glewCopyTexSubImage3D;
^
/usr/local/include/GL/glew.h:16452:28: note: 'PFNGLCOPYTEXSUBIMAGE3DNVPROC'
declared here
typedef void (GLAPIENTRY * PFNGLCOPYTEXSUBIMAGE3DNVPROC) (GLenum target...
^
/usr/local/include/GL/glew.h:19861:17: error: unknown type name
'PFNGLDRAWRANGEELEMENTSPROC'; did you mean
'PFNGLDRAWRANGEELEMENTSEXTPROC'?
GLEW_FUN_EXPORT PFNGLDRAWRANGEELEMENTSPROC __glewDrawRangeElements;
^
/usr/local/include/GL/glew.h:10251:28: note: 'PFNGLDRAWRANGEELEMENTSEXTPROC'
declared here
typedef void (GLAPIENTRY * PFNGLDRAWRANGEELEMENTSEXTPROC) (GLenum mode, ...
^
/usr/local/include/GL/glew.h:19862:17: error: unknown type name
'PFNGLTEXIMAGE3DPROC'; did you mean 'PFNGLTEXIMAGE3DNVPROC'?
GLEW_FUN_EXPORT PFNGLTEXIMAGE3DPROC __glewTexImage3D;
^
/usr/local/include/GL/glew.h:16454:28: note: 'PFNGLTEXIMAGE3DNVPROC' declared
here
typedef void (GLAPIENTRY * PFNGLTEXIMAGE3DNVPROC) (GLenum target, GLint ...
^
/usr/local/include/GL/glew.h:19863:17: error: unknown type name
'PFNGLTEXSUBIMAGE3DPROC'; did you mean 'PFNGLTEXSUBIMAGE3DNVPROC'?
GLEW_FUN_EXPORT PFNGLTEXSUBIMAGE3DPROC __glewTexSubImage3D;
^
/usr/local/include/GL/glew.h:16455:28: note: 'PFNGLTEXSUBIMAGE3DNVPROC' declared
here
typedef void (GLAPIENTRY * PFNGLTEXSUBIMAGE3DNVPROC) (GLenum target, GLi...
^
/usr/local/include/GL/glew.h:19865:17: error: unknown type name
'PFNGLACTIVETEXTUREPROC'; did you mean 'PFNGLACTIVETEXTUREARBPROC'?
GLEW_FUN_EXPORT PFNGLACTIVETEXTUREPROC __glewActiveTexture;
^
/usr/local/include/GL/glew.h:5701:28: note: 'PFNGLACTIVETEXTUREARBPROC' declared
here
typedef void (GLAPIENTRY * PFNGLACTIVETEXTUREARBPROC) (GLenum texture);
^
/usr/local/include/GL/glew.h:19866:17: error: unknown type name
'PFNGLCLIENTACTIVETEXTUREPROC'; did you mean
'PFNGLCLIENTACTIVETEXTUREARBPROC'?
GLEW_FUN_EXPORT PFNGLCLIENTACTIVETEXTUREPROC __glewClientActiveTexture;
^
/usr/local/include/GL/glew.h:5702:28: note: 'PFNGLCLIENTACTIVETEXTUREARBPROC'
declared here
typedef void (GLAPIENTRY * PFNGLCLIENTACTIVETEXTUREARBPROC) (GLenum texture);
^
/usr/local/include/GL/glew.h:19867:17: error: unknown type name
'PFNGLCOMPRESSEDTEXIMAGE1DPROC'
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXIMAGE1DPROC __glewCompressedTexImage1D;
^
/usr/local/include/GL/glew.h:19868:17: error: unknown type name
'PFNGLCOMPRESSEDTEXIMAGE2DPROC'
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXIMAGE2DPROC __glewCompressedTexImage2D;
^
/usr/local/include/GL/glew.h:19869:17: error: unknown type name
'PFNGLCOMPRESSEDTEXIMAGE3DPROC'; did you mean
'PFNGLCOMPRESSEDTEXIMAGE3DNVPROC'?
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXIMAGE3DPROC __glewCompressedTexImage3D;
^
/usr/local/include/GL/glew.h:16450:28: note: 'PFNGLCOMPRESSEDTEXIMAGE3DNVPROC'
declared here
typedef void (GLAPIENTRY * PFNGLCOMPRESSEDTEXIMAGE3DNVPROC) (GLenum targ...
^
/usr/local/include/GL/glew.h:19870:17: error: unknown type name
'PFNGLCOMPRESSEDTEXSUBIMAGE1DPROC'
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXSUBIMAGE1DPROC __glewCompressedTexSubImage1D;
^
/usr/local/include/GL/glew.h:19871:17: error: unknown type name
'PFNGLCOMPRESSEDTEXSUBIMAGE2DPROC'
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXSUBIMAGE2DPROC __glewCompressedTexSubImage2D;
^
/usr/local/include/GL/glew.h:19872:17: error: unknown type name
'PFNGLCOMPRESSEDTEXSUBIMAGE3DPROC'; did you mean
'PFNGLCOMPRESSEDTEXSUBIMAGE3DNVPROC'?
GLEW_FUN_EXPORT PFNGLCOMPRESSEDTEXSUBIMAGE3DPROC __glewCompressedTexSubImage3D;
^
/usr/local/include/GL/glew.h:16451:28: note:
'PFNGLCOMPRESSEDTEXSUBIMAGE3DNVPROC' declared here
typedef void (GLAPIENTRY * PFNGLCOMPRESSEDTEXSUBIMAGE3DNVPROC) (GLenum t...
^
/usr/local/include/GL/glew.h:19873:17: error: unknown type name
'PFNGLGETCOMPRESSEDTEXIMAGEPROC'; did you mean
'PFNGLGETNCOMPRESSEDTEXIMAGEPROC'?
GLEW_FUN_EXPORT PFNGLGETCOMPRESSEDTEXIMAGEPROC __glewGetCompressedTexImage;
^
/usr/local/include/GL/glew.h:2486:28: note: 'PFNGLGETNCOMPRESSEDTEXIMAGEPROC'
declared here
typedef void (GLAPIENTRY * PFNGLGETNCOMPRESSEDTEXIMAGEPROC) (GLenum targ...
^
/usr/local/include/GL/glew.h:19874:17: error: unknown type name
'PFNGLLOADTRANSPOSEMATRIXDPROC'; did you mean
'PFNGLLOADTRANSPOSEMATRIXDARBPROC'?
GLEW_FUN_EXPORT PFNGLLOADTRANSPOSEMATRIXDPROC __glewLoadTransposeMatrixd;
^
/usr/local/include/GL/glew.h:7683:28: note: 'PFNGLLOADTRANSPOSEMATRIXDARBPROC'
declared here
typedef void (GLAPIENTRY * PFNGLLOADTRANSPOSEMATRIXDARBPROC) (GLdouble m[16]);
^
/usr/local/include/GL/glew.h:19875:17: error: unknown type name
'PFNGLLOADTRANSPOSEMATRIXFPROC'; did you mean
'PFNGLLOADTRANSPOSEMATRIXFARBPROC'?
GLEW_FUN_EXPORT PFNGLLOADTRANSPOSEMATRIXFPROC __glewLoadTransposeMatrixf;
^
/usr/local/include/GL/glew.h:7684:28: note: 'PFNGLLOADTRANSPOSEMATRIXFARBPROC'
declared here
typedef void (GLAPIENTRY * PFNGLLOADTRANSPOSEMATRIXFARBPROC) (GLfloat m[16]);
^
/usr/local/include/GL/glew.h:19876:17: error: unknown type name
'PFNGLMULTTRANSPOSEMATRIXDPROC'; did you mean
'PFNGLMULTTRANSPOSEMATRIXDARBPROC'?
GLEW_FUN_EXPORT PFNGLMULTTRANSPOSEMATRIXDPROC __glewMultTransposeMatrixd;
^
/usr/local/include/GL/glew.h:7685:28: note: 'PFNGLMULTTRANSPOSEMATRIXDARBPROC'
declared here
typedef void (GLAPIENTRY * PFNGLMULTTRANSPOSEMATRIXDARBPROC) (GLdouble m[16]);
^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
我正在尝试学习OpenGL，但不知道该怎么做。
答案 0 :(得分：2)
Glut和GLFW是完全不同的库。参见此处What is the difference between FreeGLUT vs GLFW?
我不建议尝试将它们混合在同一程序中，并且.h文件可能会冲突-这可能解释了许多错误。
通常您可以使用GLFW或GLUT，但不能同时使用它们，而且它们的行为也大不相同。
我还注意到您正在使用即时模式在OpenGL中进行绘制。这很容易，并不是一个不好的起点，但是现在不再像现在这样。因此，为使用顶点阵列对象（VBO）绘制更复杂但速度更快且功能更强大的方法做好准备。在执行即时模式时，请尝试先阅读并做一些VBO教程。
答案 1 :(得分：0)
在GLFW之前必须包含GLEW。
您需要将GLFW和GLEW的包含顺序更改为：
#include <GL/glew.h>
#include <GLFW/glfw3.h>
错误中指出了这种罪恶：
/usr/local/include/GL/glew.h:85:2: error: gl.h included before glew.h