Add support for WGL_ARB_create_context errors

README.md

@@ -101,6 +101,7 @@ information on what to include when reporting a bug.
                    `linmath.h` (#785)
  - [Win32] Bugfix: The first shown window ignored the `GLFW_MAXIMIZED` hint
                    when the process was provided a `STARTUPINFO` (#780)
+ - [WGL] Added reporting of errors from `WGL_ARB_create_context` extension
  - [GLX] Bugfix: Dynamically loaded entry points were not verified
  - [EGL] Added `lib` prefix matching between EGL and OpenGL ES library binaries
  - [EGL] Bugfix: Dynamically loaded entry points were not verified

src/wgl_context.c

@@ -623,8 +623,44 @@ GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
                                               share, attribs);
         if (!window->context.wgl.handle)
         {
-            _glfwInputError(GLFW_VERSION_UNAVAILABLE,
-                            "WGL: Failed to create OpenGL context");
+            const DWORD error = GetLastError();
+
+            if (error == (0xc0070000 | ERROR_INVALID_VERSION_ARB))
+            {
+                if (ctxconfig->client == GLFW_OPENGL_API)
+                {
+                    _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                    "WGL: Driver does not support OpenGL version %i.%i",
+                                    ctxconfig->major,
+                                    ctxconfig->minor);
+                }
+                else
+                {
+                    _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                    "WGL: Driver does not support OpenGL ES version %i.%i",
+                                    ctxconfig->major,
+                                    ctxconfig->minor);
+                }
+            }
+            else if (error == (0xc0070000 | ERROR_INVALID_PROFILE_ARB))
+            {
+                _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                "WGL: Driver does not support the requested OpenGL profile");
+            }
+            else
+            {
+                if (ctxconfig->client == GLFW_OPENGL_API)
+                {
+                    _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                    "WGL: Failed to create OpenGL context");
+                }
+                else
+                {
+                    _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                    "WGL: Failed to create OpenGL ES context");
+                }
+            }
+
             return GLFW_FALSE;
         }
     }

src/wgl_context.h

@@ -73,6 +73,9 @@
 #define WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB 0
 #define WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB 0x2098
 
+#define ERROR_INVALID_VERSION_ARB 0x2095
+#define ERROR_INVALID_PROFILE_ARB 0x2096
+
 typedef BOOL (WINAPI * PFNWGLSWAPINTERVALEXTPROC)(int);
 typedef BOOL (WINAPI * PFNWGLGETPIXELFORMATATTRIBIVARBPROC)(HDC,int,int,UINT,const int*,int*);
 typedef const char* (WINAPI * PFNWGLGETEXTENSIONSSTRINGEXTPROC)(void);