I am trying to use openGL and have just setup glad, however when I call gladLoadGLLoader it give mes the error "Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function declared with one calling convention with a function pointer declared with a different calling convention. ". I have never seen this error before, the exact line of code is the following
glGetString = (PFNGLGETSTRINGPROC)load("glGetString"); my code is just in a window wrapper class
Window::Window(int _width, int _height, int x, int y, const char* title) { width = _width; height = _height; windowX = x; windowY = y; windowTitle = title; RECT wr; wr.left = 100; wr.right = width + wr.left; wr.top = 100; wr.bottom = height + wr.top; if (AdjustWindowRect(&wr, WS_CAPTION | WS_MINIMIZEBOX | WS_SYSMENU, FALSE) == 0) { Exception::WindowException e("AdjustWindowRect failed", __FILE__, __LINE__, -1); throw e; } /// /// temporary window /// HWND temporaryHandle = CreateWindowExA(0l, WindowClass::getInstance().getClassName(), "temporary Window", WS_CLIPSIBLINGS | WS_CLIPCHILDREN, 0, 0, 1, 1, NULL, NULL, WindowClass::getInstance().getHInstance(), NULL); HDC temporaryDeviceContext = GetDC(temporaryHandle); PIXELFORMATDESCRIPTOR temporaryPFD = { 0 }; temporaryPFD.nSize = sizeof(PIXELFORMATDESCRIPTOR); temporaryPFD.nVersion = 1; temporaryPFD.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER; temporaryPFD.iPixelType = PFD_TYPE_RGBA; temporaryPFD.cColorBits = 32; temporaryPFD.cAlphaBits = 8; temporaryPFD.cDepthBits = 24; int temporaryPFDSuccess = ChoosePixelFormat(temporaryDeviceContext, &temporaryPFD); if (temporaryPFDSuccess == 0) { Exception::WindowException e("ChoosePixelFormat failed", __FILE__, __LINE__, -1); throw e; } if (SetPixelFormat(temporaryDeviceContext, temporaryPFDSuccess, &temporaryPFD) == false) { Exception::WindowException e("SetPixelFormat failed", __FILE__, __LINE__, -1); throw e; } HGLRC temporaryContext = wglCreateContext(temporaryDeviceContext); if (temporaryContext == 0) { Exception::WindowException e("wglCreateContext failed", __FILE__, __LINE__, -1); throw e; } if (wglMakeCurrent(temporaryDeviceContext, temporaryContext) == 0) { Exception::WindowException e("wglMakeCurrent failed", __FILE__, __LINE__, -1); throw e; } PFNWGLCHOOSEPIXELFORMATARBPROC wglChoosePixelFormatARB = nullptr; wglChoosePixelFormatARB = reinterpret_cast<PFNWGLCHOOSEPIXELFORMATARBPROC>(wglGetProcAddress("wglChoosePixelFormatARB")); if (wglChoosePixelFormatARB == nullptr) { Exception::WindowException e("wglChoosePixelFormatARB did not load properly", __FILE__, __LINE__, -1); throw e; } PFNWGLCREATECONTEXTATTRIBSARBPROC wglCreateContextAttribsARB = nullptr; wglCreateContextAttribsARB = reinterpret_cast<PFNWGLCREATECONTEXTATTRIBSARBPROC>(wglGetProcAddress("wglCreateContextAttribsARB")); if (wglCreateContextAttribsARB == nullptr) { Exception::WindowException e("wglCreateContetAttribsARB did not load properly", __FILE__, __LINE__, -1); throw e; } /// /// real window /// windowHandle = CreateWindowExA(0l, WindowClass::getInstance().getClassName(), windowTitle, WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, windowX, windowY, wr.right - wr.left, wr.bottom - wr.top, nullptr, nullptr, WindowClass::getInstance().getHInstance(), this); HDC realDeviceContext = GetDC(windowHandle); const int pixelAttribs[] = { WGL_DRAW_TO_WINDOW_ARB, GL_TRUE, WGL_SUPPORT_OPENGL_ARB, GL_TRUE, WGL_DOUBLE_BUFFER_ARB, GL_TRUE, WGL_PIXEL_TYPE_ARB, WGL_TYPE_RGBA_ARB, WGL_ACCELERATION_ARB, WGL_FULL_ACCELERATION_ARB, WGL_COLOR_BITS_ARB, 32, WGL_ALPHA_BITS_ARB, 8, WGL_DEPTH_BITS_ARB, 24, WGL_STENCIL_BITS_ARB, 8, WGL_SAMPLE_BUFFERS_ARB, GL_TRUE, WGL_SAMPLES_ARB, 4, 0 }; int pixelFormatID; UINT numFormats; bool status = wglChoosePixelFormatARB(realDeviceContext, pixelAttribs, NULL, 1, &pixelFormatID, &numFormats); if (status == false || numFormats == 0) { Exception::WindowException e("wglChoosePixelFormatARB", __FILE__, __LINE__, -1); throw e; } PIXELFORMATDESCRIPTOR realPFD; DescribePixelFormat(realDeviceContext, pixelFormatID, sizeof(realPFD), &realPFD); SetPixelFormat(realDeviceContext, pixelFormatID, &realPFD); const int major_min = 4, minor_min = 5; int contextAttribs[] = { WGL_CONTEXT_MAJOR_VERSION_ARB, major_min, WGL_CONTEXT_MINOR_VERSION_ARB, minor_min, WGL_CONTEXT_PROFILE_MASK_ARB, WGL_CONTEXT_CORE_PROFILE_BIT_ARB, 0 }; HGLRC realContext = wglCreateContextAttribsARB(realDeviceContext, 0, contextAttribs); if (realContext == NULL) { Exception::WindowException e("wglCreateContextAttribsARB failed", __FILE__, __LINE__, -1); throw e; } wglMakeCurrent(NULL, NULL); wglDeleteContext(temporaryContext); ReleaseDC(temporaryHandle, temporaryDeviceContext); DestroyWindow(temporaryHandle); int madeCurrent = wglMakeCurrent(realDeviceContext, realContext); if (madeCurrent == 0) { Exception::WindowException e("wglMakeCurrent failed", __FILE__, __LINE__, -1); throw e; } if (!gladLoadGLLoader((GLADloadproc)wglGetProcAddress)) { PostQuitMessage(0); return; } glClear(GL_COLOR_BUFFER_BIT); SwapBuffers(realDeviceContext); ShowWindow(windowHandle, SW_SHOW); } 
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