SDL2和SDL_opengl_glext.h未定义外部

Question

在尝试从我的SDL2项目中的gl3w移开时，我遇到了问题。 我考虑这一点的原因仅仅是因为我注意到我的gl3w版本不包含“ glAlphaFunc”，但是SDL_opengl_glext.h包含了。

看来我需要定义以下内容：

#define GL_GLEXT_PROTOTYPES
#define GLX_GLEXT_PROTOTYPES

因此，在我注意到SDL_opengl_glext.h存在之后，我发现也许可以简单地包含SDL_opengl.h和SDL_opengl_glext.h（就像我在iOS上所做的那样：SDL_opengl.h和SDL_opengles.h），但是现在我遇到了不确定的外部问题。

我当前引用的lib文件：

opengl32.lib; glu32.lib; SDL2.lib; SDL2main.lib; SDL2test.lib; SDL2_image.lib; SDL2_ttf.lib; SDL2_mixer.lib; libboost_filesystem-vc140-mt-1_58.lib; libboost_system-vc140-mt-1_58。 lib; libpq.lib; ssleay32.lib; libeay32.lib;％（AdditionalDependencies）

我的问题是：我可以使用SDL2链接任何其他lib文件来解决此问题，如何正确使用SDL_opengl_glext.h？ 我没有看到关于此问题的明确文档。

错误喷出：

1>emitter.obj : error LNK2019: unresolved external symbol __imp_glBindBuffer referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glBindBuffer
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glBindBuffer
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glGenBuffers referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glGenBuffers
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glGenBuffers
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glBufferData referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glBufferData
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glBufferData
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glDisableVertexAttribArray referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glDisableVertexAttribArray
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glDisableVertexAttribArray
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glEnableVertexAttribArray referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glEnableVertexAttribArray
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glEnableVertexAttribArray
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glUseProgram referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glUseProgram
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glUseProgram
1>emitter.obj : error LNK2019: unresolved external symbol __imp_glVertexAttribPointer referenced in function "protected: virtual void __cdecl MV::Scene::Emitter::defaultDrawImplementation(void)" (?defaultDrawImplementation@Emitter@Scene@MV@@MEAAXXZ)
1>drawable.obj : error LNK2001: unresolved external symbol __imp_glVertexAttribPointer
1>spineMV.obj : error LNK2001: unresolved external symbol __imp_glVertexAttribPointer
1>render.obj : error LNK2019: unresolved external symbol __imp_glActiveTexture referenced in function "public: void __cdecl MV::Shader::set(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::shared_ptr<class MV::TextureDefinition> const &,unsigned int)" (?set@Shader@MV@@QEAAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEBV?$shared_ptr@VTextureDefinition@MV@@@4@I@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glBlendFuncSeparate referenced in function "public: void __cdecl MV::Draw2D::defaultBlendFunction(void)" (?defaultBlendFunction@Draw2D@MV@@QEAAXXZ)
1>render.obj : error LNK2019: unresolved external symbol __imp_glBlendEquationSeparate referenced in function "public: void __cdecl MV::glExtensionBlendMode::setBlendEquation(unsigned int,unsigned int)" (?setBlendEquation@glExtensionBlendMode@MV@@QEAAXII@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glAttachShader referenced in function "public: class MV::Shader * __cdecl MV::Draw2D::loadShaderCode(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadShaderCode@Draw2D@MV@@QEAAPEAVShader@2@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glCompileShader referenced in function "private: void __cdecl MV::Draw2D::loadPartOfShader(unsigned int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadPartOfShader@Draw2D@MV@@AEAAXIAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glCreateProgram referenced in function "public: class MV::Shader * __cdecl MV::Draw2D::loadShaderCode(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadShaderCode@Draw2D@MV@@QEAAPEAVShader@2@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glCreateShader referenced in function "public: class MV::Shader * __cdecl MV::Draw2D::loadShaderCode(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadShaderCode@Draw2D@MV@@QEAAPEAVShader@2@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGetActiveUniform referenced in function "public: __cdecl MV::Shader::Shader(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,bool)" (??0Shader@MV@@QEAA@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@I_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGetProgramiv referenced in function "public: __cdecl MV::Shader::Shader(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,bool)" (??0Shader@MV@@QEAA@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@I_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGetShaderiv referenced in function "private: void __cdecl MV::Draw2D::validateShaderStatus(unsigned int,bool)" (?validateShaderStatus@Draw2D@MV@@AEAAXI_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGetShaderInfoLog referenced in function "private: void __cdecl MV::Draw2D::validateShaderStatus(unsigned int,bool)" (?validateShaderStatus@Draw2D@MV@@AEAAXI_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGetUniformLocation referenced in function "public: __cdecl MV::Shader::Shader(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,bool)" (??0Shader@MV@@QEAA@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@I_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glIsProgram referenced in function "public: __cdecl MV::Shader::Shader(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,unsigned int,bool)" (??0Shader@MV@@QEAA@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@I_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glLinkProgram referenced in function "public: class MV::Shader * __cdecl MV::Draw2D::loadShaderCode(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadShaderCode@Draw2D@MV@@QEAAPEAVShader@2@AEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@00@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glShaderSource referenced in function "private: void __cdecl MV::Draw2D::loadPartOfShader(unsigned int,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (?loadPartOfShader@Draw2D@MV@@AEAAXIAEBV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glUniform1i referenced in function "public: void __cdecl MV::Shader::set(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::shared_ptr<class MV::TextureDefinition> const &,unsigned int)" (?set@Shader@MV@@QEAAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEBV?$shared_ptr@VTextureDefinition@MV@@@4@I@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glUniform1fv referenced in function "public: void __cdecl MV::Shader::set(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,float)" (?set@Shader@MV@@QEAAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@M@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glUniformMatrix4fv referenced in function "public: void __cdecl MV::Shader::set(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class MV::TransformMatrix const &)" (?set@Shader@MV@@QEAAXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AEBVTransformMatrix@2@@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glBindRenderbuffer referenced in function "public: void __cdecl MV::glExtensionFramebufferObject::startUsingFramebuffer(class std::weak_ptr<class MV::Framebuffer>,bool)" (?startUsingFramebuffer@glExtensionFramebufferObject@MV@@QEAAXV?$weak_ptr@VFramebuffer@MV@@@std@@_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glDeleteRenderbuffers referenced in function "public: __cdecl MV::Framebuffer::~Framebuffer(void)" (??1Framebuffer@MV@@QEAA@XZ)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGenRenderbuffers referenced in function "public: class std::shared_ptr<class MV::Framebuffer> __cdecl MV::glExtensionFramebufferObject::makeFramebuffer(class MV::Point<int> const &,class MV::Size<int> const &,unsigned int,class MV::Color const &)" (?makeFramebuffer@glExtensionFramebufferObject@MV@@QEAA?AV?$shared_ptr@VFramebuffer@MV@@@std@@AEBV?$Point@H@2@AEBV?$Size@H@2@IAEBVColor@2@@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glRenderbufferStorage referenced in function "public: void __cdecl MV::glExtensionFramebufferObject::startUsingFramebuffer(class std::weak_ptr<class MV::Framebuffer>,bool)" (?startUsingFramebuffer@glExtensionFramebufferObject@MV@@QEAAXV?$weak_ptr@VFramebuffer@MV@@@std@@_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glBindFramebuffer referenced in function "public: void __cdecl MV::glExtensionFramebufferObject::startUsingFramebuffer(class std::weak_ptr<class MV::Framebuffer>,bool)" (?startUsingFramebuffer@glExtensionFramebufferObject@MV@@QEAAXV?$weak_ptr@VFramebuffer@MV@@@std@@_N@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glDeleteFramebuffers referenced in function "public: __cdecl MV::Framebuffer::~Framebuffer(void)" (??1Framebuffer@MV@@QEAA@XZ)
1>render.obj : error LNK2019: unresolved external symbol __imp_glGenFramebuffers referenced in function "public: class std::shared_ptr<class MV::Framebuffer> __cdecl MV::glExtensionFramebufferObject::makeFramebuffer(class MV::Point<int> const &,class MV::Size<int> const &,unsigned int,class MV::Color const &)" (?makeFramebuffer@glExtensionFramebufferObject@MV@@QEAA?AV?$shared_ptr@VFramebuffer@MV@@@std@@AEBV?$Point@H@2@AEBV?$Size@H@2@IAEBVColor@2@@Z)
1>render.obj : error LNK2019: unresolved external symbol __imp_glFramebufferTexture2D referenced in function "public: void __cdecl MV::glExtensionFramebufferObject::startUsingFramebuffer(class std::weak_ptr<class MV::Framebuffer>,bool)" (?startUsingFramebuffer@glExtensionFramebufferObject@MV@@QEAAXV?$weak_ptr@VFramebuffer@MV@@@std@@_N@Z)
1>C:\git\MoonDog\x64\Release\M2tMLibrary.exe : fatal error LNK1120: 33 unresolved externals

Answer 1

这不是您使用OpenGL扩展的方式。 您需要在运行时使用SDL_GL_GetProcAddress加载扩展功能，或使用任何现有的opengl加载器 。

如果只需要一个函数，则可以自己定义其原型或在运行时加载它。 请注意，较新的GL版本已弃用AlphaFunc （这是gl3w没有它的原因-因为它针对GL 3或更高版本），因此如果您针对这些版本，则不能使用它。

Answer 2

什么是未定义的引用/未解决的外部符号错误，如何解决？

您需要链接到SDL2main.lib，然后链接到SDL2.lib，然后链接到任何其他SDL库。

确保链接到编译器和正确体系结构都可以的二进制文件。

如果所有其他方法均失败，请自行编译SDL。