SDL2 und SDL_opengl_glext.h undefined external

Question

Ich habe Probleme, wenn ich versuche, in meinem SDL2-Projekt von gl3w wegzukommen. Der Grund, warum ich darüber nachdenke, ist einfach, weil ich bemerkt habe, dass meine Version von gl3w "glAlphaFunc" nicht enthält, aber SDL_opengl_glext.h.

Es scheint, ich brauche folgendes zu definieren:

#define GL_GLEXT_PROTOTYPES 
#define GLX_GLEXT_PROTOTYPES 

So, nachdem ich bemerkt SDL_opengl_glext.h existiert ich dachte, vielleicht könnte ich einfach schließen SDL_opengl.h und SDL_opengl_glext.h (wie ich auf iOS tun: SDL_opengl .h und SDL_opengles.h), aber jetzt bekomme ich Probleme mit undefinierten Externals.

Die lib Dateien, die ich zur Zeit bin Referenzierung:

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)

Meine Frage lautet: Mit SDL2 kann ich einen Link andere Lib-Dateien, um dieses Problem zu beheben, wie verwende ich SDL_opengl_glext.h? Ich sehe keine eindeutige Dokumentation zu diesem Thema im Besonderen.

Fehler Spew:

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

So verwenden Sie OpenGL-Erweiterungen nicht. Sie müssen Erweiterungsfunktionen zur Laufzeit mit SDL_GL_GetProcAddress laden oder eine der vorhandenen opengl loaders verwenden.

Wenn Sie nur diese eine Funktion benötigen, können Sie ihren Prototyp selbst definieren oder zur Laufzeit laden. Beachten Sie, dass neuere GL-Versionen AlphaFunc verwarfen (was der Grund ist, warum gl3w es nicht hat - da es GL 3 oder höher anvisiert), so dass Sie es nicht verwenden können, wenn Sie diese Versionen als Ziel haben.

Answer 2

What is an undefined reference/unresolved external symbol error and how do I fix it?

Sie benötigen dann alle anderen SDL-Bibliotheken SDL2main.lib Dann SDL2.lib zu verknüpfen.

Stellen Sie sicher, dass Sie mit einer Binärdatei verlinken, die von Ihrem Compiler und der richtigen Architektur in Ordnung ist.

Wenn alles andere fehlschlägt, kompilieren Sie SDL selbst.