add glfw library

1 files changed, 798 insertions, 0 deletions

diff --git a/libs/glfw-3.3.8/src/wgl_context.c b/libs/glfw-3.3.8/src/wgl_context.c
new file mode 100644
index 0000000..72ad11d
--- /dev/null
+++ b/libs/glfw-3.3.8/src/wgl_context.c
@@ -0,0 +1,798 @@
+//========================================================================
+// GLFW 3.3 WGL - www.glfw.org
+//------------------------------------------------------------------------
+// Copyright (c) 2002-2006 Marcus Geelnard
+// Copyright (c) 2006-2019 Camilla Löwy <elmindreda@glfw.org>
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+//
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+//
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would
+//    be appreciated but is not required.
+//
+// 2. Altered source versions must be plainly marked as such, and must not
+//    be misrepresented as being the original software.
+//
+// 3. This notice may not be removed or altered from any source
+//    distribution.
+//
+//========================================================================
+// Please use C89 style variable declarations in this file because VS 2010
+//========================================================================
+
+#include "internal.h"
+
+#include <stdlib.h>
+#include <malloc.h>
+#include <assert.h>
+
+// Return the value corresponding to the specified attribute
+//
+static int findPixelFormatAttribValue(const int* attribs,
+                                      int attribCount,
+                                      const int* values,
+                                      int attrib)
+{
+    int i;
+
+    for (i = 0;  i < attribCount;  i++)
+    {
+        if (attribs[i] == attrib)
+            return values[i];
+    }
+
+    _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                         "WGL: Unknown pixel format attribute requested");
+    return 0;
+}
+
+#define addAttrib(a) \
+{ \
+    assert((size_t) attribCount < sizeof(attribs) / sizeof(attribs[0])); \
+    attribs[attribCount++] = a; \
+}
+#define findAttribValue(a) \
+    findPixelFormatAttribValue(attribs, attribCount, values, a)
+
+// Return a list of available and usable framebuffer configs
+//
+static int choosePixelFormat(_GLFWwindow* window,
+                             const _GLFWctxconfig* ctxconfig,
+                             const _GLFWfbconfig* fbconfig)
+{
+    _GLFWfbconfig* usableConfigs;
+    const _GLFWfbconfig* closest;
+    int i, pixelFormat, nativeCount, usableCount = 0, attribCount = 0;
+    int attribs[40];
+    int values[sizeof(attribs) / sizeof(attribs[0])];
+
+    if (_glfw.wgl.ARB_pixel_format)
+    {
+        const int attrib = WGL_NUMBER_PIXEL_FORMATS_ARB;
+
+        if (!wglGetPixelFormatAttribivARB(window->context.wgl.dc,
+                                          1, 0, 1, &attrib, &nativeCount))
+        {
+            _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                 "WGL: Failed to retrieve pixel format attribute");
+            return 0;
+        }
+
+        addAttrib(WGL_SUPPORT_OPENGL_ARB);
+        addAttrib(WGL_DRAW_TO_WINDOW_ARB);
+        addAttrib(WGL_PIXEL_TYPE_ARB);
+        addAttrib(WGL_ACCELERATION_ARB);
+        addAttrib(WGL_RED_BITS_ARB);
+        addAttrib(WGL_RED_SHIFT_ARB);
+        addAttrib(WGL_GREEN_BITS_ARB);
+        addAttrib(WGL_GREEN_SHIFT_ARB);
+        addAttrib(WGL_BLUE_BITS_ARB);
+        addAttrib(WGL_BLUE_SHIFT_ARB);
+        addAttrib(WGL_ALPHA_BITS_ARB);
+        addAttrib(WGL_ALPHA_SHIFT_ARB);
+        addAttrib(WGL_DEPTH_BITS_ARB);
+        addAttrib(WGL_STENCIL_BITS_ARB);
+        addAttrib(WGL_ACCUM_BITS_ARB);
+        addAttrib(WGL_ACCUM_RED_BITS_ARB);
+        addAttrib(WGL_ACCUM_GREEN_BITS_ARB);
+        addAttrib(WGL_ACCUM_BLUE_BITS_ARB);
+        addAttrib(WGL_ACCUM_ALPHA_BITS_ARB);
+        addAttrib(WGL_AUX_BUFFERS_ARB);
+        addAttrib(WGL_STEREO_ARB);
+        addAttrib(WGL_DOUBLE_BUFFER_ARB);
+
+        if (_glfw.wgl.ARB_multisample)
+            addAttrib(WGL_SAMPLES_ARB);
+
+        if (ctxconfig->client == GLFW_OPENGL_API)
+        {
+            if (_glfw.wgl.ARB_framebuffer_sRGB || _glfw.wgl.EXT_framebuffer_sRGB)
+                addAttrib(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB);
+        }
+        else
+        {
+            if (_glfw.wgl.EXT_colorspace)
+                addAttrib(WGL_COLORSPACE_EXT);
+        }
+    }
+    else
+    {
+        nativeCount = DescribePixelFormat(window->context.wgl.dc,
+                                          1,
+                                          sizeof(PIXELFORMATDESCRIPTOR),
+                                          NULL);
+    }
+
+    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
+
+    for (i = 0;  i < nativeCount;  i++)
+    {
+        _GLFWfbconfig* u = usableConfigs + usableCount;
+        pixelFormat = i + 1;
+
+        if (_glfw.wgl.ARB_pixel_format)
+        {
+            // Get pixel format attributes through "modern" extension
+
+            if (!wglGetPixelFormatAttribivARB(window->context.wgl.dc,
+                                              pixelFormat, 0,
+                                              attribCount,
+                                              attribs, values))
+            {
+                _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                    "WGL: Failed to retrieve pixel format attributes");
+
+                free(usableConfigs);
+                return 0;
+            }
+
+            if (!findAttribValue(WGL_SUPPORT_OPENGL_ARB) ||
+                !findAttribValue(WGL_DRAW_TO_WINDOW_ARB))
+            {
+                continue;
+            }
+
+            if (findAttribValue(WGL_PIXEL_TYPE_ARB) != WGL_TYPE_RGBA_ARB)
+                continue;
+
+            if (findAttribValue(WGL_ACCELERATION_ARB) == WGL_NO_ACCELERATION_ARB)
+                continue;
+
+            if (findAttribValue(WGL_DOUBLE_BUFFER_ARB) != fbconfig->doublebuffer)
+                continue;
+
+            u->redBits = findAttribValue(WGL_RED_BITS_ARB);
+            u->greenBits = findAttribValue(WGL_GREEN_BITS_ARB);
+            u->blueBits = findAttribValue(WGL_BLUE_BITS_ARB);
+            u->alphaBits = findAttribValue(WGL_ALPHA_BITS_ARB);
+
+            u->depthBits = findAttribValue(WGL_DEPTH_BITS_ARB);
+            u->stencilBits = findAttribValue(WGL_STENCIL_BITS_ARB);
+
+            u->accumRedBits = findAttribValue(WGL_ACCUM_RED_BITS_ARB);
+            u->accumGreenBits = findAttribValue(WGL_ACCUM_GREEN_BITS_ARB);
+            u->accumBlueBits = findAttribValue(WGL_ACCUM_BLUE_BITS_ARB);
+            u->accumAlphaBits = findAttribValue(WGL_ACCUM_ALPHA_BITS_ARB);
+
+            u->auxBuffers = findAttribValue(WGL_AUX_BUFFERS_ARB);
+
+            if (findAttribValue(WGL_STEREO_ARB))
+                u->stereo = GLFW_TRUE;
+
+            if (_glfw.wgl.ARB_multisample)
+                u->samples = findAttribValue(WGL_SAMPLES_ARB);
+
+            if (ctxconfig->client == GLFW_OPENGL_API)
+            {
+                if (_glfw.wgl.ARB_framebuffer_sRGB ||
+                    _glfw.wgl.EXT_framebuffer_sRGB)
+                {
+                    if (findAttribValue(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
+                        u->sRGB = GLFW_TRUE;
+                }
+            }
+            else
+            {
+                if (_glfw.wgl.EXT_colorspace)
+                {
+                    if (findAttribValue(WGL_COLORSPACE_EXT) == WGL_COLORSPACE_SRGB_EXT)
+                        u->sRGB = GLFW_TRUE;
+                }
+            }
+        }
+        else
+        {
+            // Get pixel format attributes through legacy PFDs
+
+            PIXELFORMATDESCRIPTOR pfd;
+
+            if (!DescribePixelFormat(window->context.wgl.dc,
+                                     pixelFormat,
+                                     sizeof(PIXELFORMATDESCRIPTOR),
+                                     &pfd))
+            {
+                _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                    "WGL: Failed to describe pixel format");
+
+                free(usableConfigs);
+                return 0;
+            }
+
+            if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
+                !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
+            {
+                continue;
+            }
+
+            if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
+                (pfd.dwFlags & PFD_GENERIC_FORMAT))
+            {
+                continue;
+            }
+
+            if (pfd.iPixelType != PFD_TYPE_RGBA)
+                continue;
+
+            if (!!(pfd.dwFlags & PFD_DOUBLEBUFFER) != fbconfig->doublebuffer)
+                continue;
+
+            u->redBits = pfd.cRedBits;
+            u->greenBits = pfd.cGreenBits;
+            u->blueBits = pfd.cBlueBits;
+            u->alphaBits = pfd.cAlphaBits;
+
+            u->depthBits = pfd.cDepthBits;
+            u->stencilBits = pfd.cStencilBits;
+
+            u->accumRedBits = pfd.cAccumRedBits;
+            u->accumGreenBits = pfd.cAccumGreenBits;
+            u->accumBlueBits = pfd.cAccumBlueBits;
+            u->accumAlphaBits = pfd.cAccumAlphaBits;
+
+            u->auxBuffers = pfd.cAuxBuffers;
+
+            if (pfd.dwFlags & PFD_STEREO)
+                u->stereo = GLFW_TRUE;
+        }
+
+        u->handle = pixelFormat;
+        usableCount++;
+    }
+
+    if (!usableCount)
+    {
+        _glfwInputError(GLFW_API_UNAVAILABLE,
+                        "WGL: The driver does not appear to support OpenGL");
+
+        free(usableConfigs);
+        return 0;
+    }
+
+    closest = _glfwChooseFBConfig(fbconfig, usableConfigs, usableCount);
+    if (!closest)
+    {
+        _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
+                        "WGL: Failed to find a suitable pixel format");
+
+        free(usableConfigs);
+        return 0;
+    }
+
+    pixelFormat = (int) closest->handle;
+    free(usableConfigs);
+
+    return pixelFormat;
+}
+
+#undef addAttrib
+#undef findAttribValue
+
+static void makeContextCurrentWGL(_GLFWwindow* window)
+{
+    if (window)
+    {
+        if (wglMakeCurrent(window->context.wgl.dc, window->context.wgl.handle))
+            _glfwPlatformSetTls(&_glfw.contextSlot, window);
+        else
+        {
+            _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                 "WGL: Failed to make context current");
+            _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
+        }
+    }
+    else
+    {
+        if (!wglMakeCurrent(NULL, NULL))
+        {
+            _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                 "WGL: Failed to clear current context");
+        }
+
+        _glfwPlatformSetTls(&_glfw.contextSlot, NULL);
+    }
+}
+
+static void swapBuffersWGL(_GLFWwindow* window)
+{
+    if (!window->monitor)
+    {
+        if (IsWindowsVistaOrGreater())
+        {
+            // DWM Composition is always enabled on Win8+
+            BOOL enabled = IsWindows8OrGreater();
+
+            // HACK: Use DwmFlush when desktop composition is enabled
+            if (enabled ||
+                (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
+            {
+                int count = abs(window->context.wgl.interval);
+                while (count--)
+                    DwmFlush();
+            }
+        }
+    }
+
+    SwapBuffers(window->context.wgl.dc);
+}
+
+static void swapIntervalWGL(int interval)
+{
+    _GLFWwindow* window = _glfwPlatformGetTls(&_glfw.contextSlot);
+
+    window->context.wgl.interval = interval;
+
+    if (!window->monitor)
+    {
+        if (IsWindowsVistaOrGreater())
+        {
+            // DWM Composition is always enabled on Win8+
+            BOOL enabled = IsWindows8OrGreater();
+
+            // HACK: Disable WGL swap interval when desktop composition is enabled to
+            //       avoid interfering with DWM vsync
+            if (enabled ||
+                (SUCCEEDED(DwmIsCompositionEnabled(&enabled)) && enabled))
+                interval = 0;
+        }
+    }
+
+    if (_glfw.wgl.EXT_swap_control)
+        wglSwapIntervalEXT(interval);
+}
+
+static int extensionSupportedWGL(const char* extension)
+{
+    const char* extensions = NULL;
+
+    if (_glfw.wgl.GetExtensionsStringARB)
+        extensions = wglGetExtensionsStringARB(wglGetCurrentDC());
+    else if (_glfw.wgl.GetExtensionsStringEXT)
+        extensions = wglGetExtensionsStringEXT();
+
+    if (!extensions)
+        return GLFW_FALSE;
+
+    return _glfwStringInExtensionString(extension, extensions);
+}
+
+static GLFWglproc getProcAddressWGL(const char* procname)
+{
+    const GLFWglproc proc = (GLFWglproc) wglGetProcAddress(procname);
+    if (proc)
+        return proc;
+
+    return (GLFWglproc) GetProcAddress(_glfw.wgl.instance, procname);
+}
+
+static void destroyContextWGL(_GLFWwindow* window)
+{
+    if (window->context.wgl.handle)
+    {
+        wglDeleteContext(window->context.wgl.handle);
+        window->context.wgl.handle = NULL;
+    }
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                       GLFW internal API                      //////
+//////////////////////////////////////////////////////////////////////////
+
+// Initialize WGL
+//
+GLFWbool _glfwInitWGL(void)
+{
+    PIXELFORMATDESCRIPTOR pfd;
+    HGLRC prc, rc;
+    HDC pdc, dc;
+
+    if (_glfw.wgl.instance)
+        return GLFW_TRUE;
+
+    _glfw.wgl.instance = LoadLibraryA("opengl32.dll");
+    if (!_glfw.wgl.instance)
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to load opengl32.dll");
+        return GLFW_FALSE;
+    }
+
+    _glfw.wgl.CreateContext = (PFN_wglCreateContext)
+        GetProcAddress(_glfw.wgl.instance, "wglCreateContext");
+    _glfw.wgl.DeleteContext = (PFN_wglDeleteContext)
+        GetProcAddress(_glfw.wgl.instance, "wglDeleteContext");
+    _glfw.wgl.GetProcAddress = (PFN_wglGetProcAddress)
+        GetProcAddress(_glfw.wgl.instance, "wglGetProcAddress");
+    _glfw.wgl.GetCurrentDC = (PFN_wglGetCurrentDC)
+        GetProcAddress(_glfw.wgl.instance, "wglGetCurrentDC");
+    _glfw.wgl.GetCurrentContext = (PFN_wglGetCurrentContext)
+        GetProcAddress(_glfw.wgl.instance, "wglGetCurrentContext");
+    _glfw.wgl.MakeCurrent = (PFN_wglMakeCurrent)
+        GetProcAddress(_glfw.wgl.instance, "wglMakeCurrent");
+    _glfw.wgl.ShareLists = (PFN_wglShareLists)
+        GetProcAddress(_glfw.wgl.instance, "wglShareLists");
+
+    // NOTE: A dummy context has to be created for opengl32.dll to load the
+    //       OpenGL ICD, from which we can then query WGL extensions
+    // NOTE: This code will accept the Microsoft GDI ICD; accelerated context
+    //       creation failure occurs during manual pixel format enumeration
+
+    dc = GetDC(_glfw.win32.helperWindowHandle);
+
+    ZeroMemory(&pfd, sizeof(pfd));
+    pfd.nSize = sizeof(pfd);
+    pfd.nVersion = 1;
+    pfd.dwFlags = PFD_DRAW_TO_WINDOW | PFD_SUPPORT_OPENGL | PFD_DOUBLEBUFFER;
+    pfd.iPixelType = PFD_TYPE_RGBA;
+    pfd.cColorBits = 24;
+
+    if (!SetPixelFormat(dc, ChoosePixelFormat(dc, &pfd), &pfd))
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to set pixel format for dummy context");
+        return GLFW_FALSE;
+    }
+
+    rc = wglCreateContext(dc);
+    if (!rc)
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to create dummy context");
+        return GLFW_FALSE;
+    }
+
+    pdc = wglGetCurrentDC();
+    prc = wglGetCurrentContext();
+
+    if (!wglMakeCurrent(dc, rc))
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to make dummy context current");
+        wglMakeCurrent(pdc, prc);
+        wglDeleteContext(rc);
+        return GLFW_FALSE;
+    }
+
+    // NOTE: Functions must be loaded first as they're needed to retrieve the
+    //       extension string that tells us whether the functions are supported
+    _glfw.wgl.GetExtensionsStringEXT = (PFNWGLGETEXTENSIONSSTRINGEXTPROC)
+        wglGetProcAddress("wglGetExtensionsStringEXT");
+    _glfw.wgl.GetExtensionsStringARB = (PFNWGLGETEXTENSIONSSTRINGARBPROC)
+        wglGetProcAddress("wglGetExtensionsStringARB");
+    _glfw.wgl.CreateContextAttribsARB = (PFNWGLCREATECONTEXTATTRIBSARBPROC)
+        wglGetProcAddress("wglCreateContextAttribsARB");
+    _glfw.wgl.SwapIntervalEXT = (PFNWGLSWAPINTERVALEXTPROC)
+        wglGetProcAddress("wglSwapIntervalEXT");
+    _glfw.wgl.GetPixelFormatAttribivARB = (PFNWGLGETPIXELFORMATATTRIBIVARBPROC)
+        wglGetProcAddress("wglGetPixelFormatAttribivARB");
+
+    // NOTE: WGL_ARB_extensions_string and WGL_EXT_extensions_string are not
+    //       checked below as we are already using them
+    _glfw.wgl.ARB_multisample =
+        extensionSupportedWGL("WGL_ARB_multisample");
+    _glfw.wgl.ARB_framebuffer_sRGB =
+        extensionSupportedWGL("WGL_ARB_framebuffer_sRGB");
+    _glfw.wgl.EXT_framebuffer_sRGB =
+        extensionSupportedWGL("WGL_EXT_framebuffer_sRGB");
+    _glfw.wgl.ARB_create_context =
+        extensionSupportedWGL("WGL_ARB_create_context");
+    _glfw.wgl.ARB_create_context_profile =
+        extensionSupportedWGL("WGL_ARB_create_context_profile");
+    _glfw.wgl.EXT_create_context_es2_profile =
+        extensionSupportedWGL("WGL_EXT_create_context_es2_profile");
+    _glfw.wgl.ARB_create_context_robustness =
+        extensionSupportedWGL("WGL_ARB_create_context_robustness");
+    _glfw.wgl.ARB_create_context_no_error =
+        extensionSupportedWGL("WGL_ARB_create_context_no_error");
+    _glfw.wgl.EXT_swap_control =
+        extensionSupportedWGL("WGL_EXT_swap_control");
+    _glfw.wgl.EXT_colorspace =
+        extensionSupportedWGL("WGL_EXT_colorspace");
+    _glfw.wgl.ARB_pixel_format =
+        extensionSupportedWGL("WGL_ARB_pixel_format");
+    _glfw.wgl.ARB_context_flush_control =
+        extensionSupportedWGL("WGL_ARB_context_flush_control");
+
+    wglMakeCurrent(pdc, prc);
+    wglDeleteContext(rc);
+    return GLFW_TRUE;
+}
+
+// Terminate WGL
+//
+void _glfwTerminateWGL(void)
+{
+    if (_glfw.wgl.instance)
+        FreeLibrary(_glfw.wgl.instance);
+}
+
+#define setAttrib(a, v) \
+{ \
+    assert(((size_t) index + 1) < sizeof(attribs) / sizeof(attribs[0])); \
+    attribs[index++] = a; \
+    attribs[index++] = v; \
+}
+
+// Create the OpenGL or OpenGL ES context
+//
+GLFWbool _glfwCreateContextWGL(_GLFWwindow* window,
+                               const _GLFWctxconfig* ctxconfig,
+                               const _GLFWfbconfig* fbconfig)
+{
+    int attribs[40];
+    int pixelFormat;
+    PIXELFORMATDESCRIPTOR pfd;
+    HGLRC share = NULL;
+
+    if (ctxconfig->share)
+        share = ctxconfig->share->context.wgl.handle;
+
+    window->context.wgl.dc = GetDC(window->win32.handle);
+    if (!window->context.wgl.dc)
+    {
+        _glfwInputError(GLFW_PLATFORM_ERROR,
+                        "WGL: Failed to retrieve DC for window");
+        return GLFW_FALSE;
+    }
+
+    pixelFormat = choosePixelFormat(window, ctxconfig, fbconfig);
+    if (!pixelFormat)
+        return GLFW_FALSE;
+
+    if (!DescribePixelFormat(window->context.wgl.dc,
+                             pixelFormat, sizeof(pfd), &pfd))
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to retrieve PFD for selected pixel format");
+        return GLFW_FALSE;
+    }
+
+    if (!SetPixelFormat(window->context.wgl.dc, pixelFormat, &pfd))
+    {
+        _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                             "WGL: Failed to set selected pixel format");
+        return GLFW_FALSE;
+    }
+
+    if (ctxconfig->client == GLFW_OPENGL_API)
+    {
+        if (ctxconfig->forward)
+        {
+            if (!_glfw.wgl.ARB_create_context)
+            {
+                _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                "WGL: A forward compatible OpenGL context requested but WGL_ARB_create_context is unavailable");
+                return GLFW_FALSE;
+            }
+        }
+
+        if (ctxconfig->profile)
+        {
+            if (!_glfw.wgl.ARB_create_context_profile)
+            {
+                _glfwInputError(GLFW_VERSION_UNAVAILABLE,
+                                "WGL: OpenGL profile requested but WGL_ARB_create_context_profile is unavailable");
+                return GLFW_FALSE;
+            }
+        }
+    }
+    else
+    {
+        if (!_glfw.wgl.ARB_create_context ||
+            !_glfw.wgl.ARB_create_context_profile ||
+            !_glfw.wgl.EXT_create_context_es2_profile)
+        {
+            _glfwInputError(GLFW_API_UNAVAILABLE,
+                            "WGL: OpenGL ES requested but WGL_ARB_create_context_es2_profile is unavailable");
+            return GLFW_FALSE;
+        }
+    }
+
+    if (_glfw.wgl.ARB_create_context)
+    {
+        int index = 0, mask = 0, flags = 0;
+
+        if (ctxconfig->client == GLFW_OPENGL_API)
+        {
+            if (ctxconfig->forward)
+                flags |= WGL_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB;
+
+            if (ctxconfig->profile == GLFW_OPENGL_CORE_PROFILE)
+                mask |= WGL_CONTEXT_CORE_PROFILE_BIT_ARB;
+            else if (ctxconfig->profile == GLFW_OPENGL_COMPAT_PROFILE)
+                mask |= WGL_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB;
+        }
+        else
+            mask |= WGL_CONTEXT_ES2_PROFILE_BIT_EXT;
+
+        if (ctxconfig->debug)
+            flags |= WGL_CONTEXT_DEBUG_BIT_ARB;
+
+        if (ctxconfig->robustness)
+        {
+            if (_glfw.wgl.ARB_create_context_robustness)
+            {
+                if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
+                {
+                    setAttrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
+                              WGL_NO_RESET_NOTIFICATION_ARB);
+                }
+                else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
+                {
+                    setAttrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
+                              WGL_LOSE_CONTEXT_ON_RESET_ARB);
+                }
+
+                flags |= WGL_CONTEXT_ROBUST_ACCESS_BIT_ARB;
+            }
+        }
+
+        if (ctxconfig->release)
+        {
+            if (_glfw.wgl.ARB_context_flush_control)
+            {
+                if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_NONE)
+                {
+                    setAttrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
+                              WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB);
+                }
+                else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)
+                {
+                    setAttrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
+                              WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB);
+                }
+            }
+        }
+
+        if (ctxconfig->noerror)
+        {
+            if (_glfw.wgl.ARB_create_context_no_error)
+                setAttrib(WGL_CONTEXT_OPENGL_NO_ERROR_ARB, GLFW_TRUE);
+        }
+
+        // NOTE: Only request an explicitly versioned context when necessary, as
+        //       explicitly requesting version 1.0 does not always return the
+        //       highest version supported by the driver
+        if (ctxconfig->major != 1 || ctxconfig->minor != 0)
+        {
+            setAttrib(WGL_CONTEXT_MAJOR_VERSION_ARB, ctxconfig->major);
+            setAttrib(WGL_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor);
+        }
+
+        if (flags)
+            setAttrib(WGL_CONTEXT_FLAGS_ARB, flags);
+
+        if (mask)
+            setAttrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask);
+
+        setAttrib(0, 0);
+
+        window->context.wgl.handle =
+            wglCreateContextAttribsARB(window->context.wgl.dc, share, attribs);
+        if (!window->context.wgl.handle)
+        {
+            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 (error == (0xc0070000 | ERROR_INCOMPATIBLE_DEVICE_CONTEXTS_ARB))
+            {
+                _glfwInputError(GLFW_INVALID_VALUE,
+                                "WGL: The share context is not compatible with the requested context");
+            }
+            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;
+        }
+    }
+    else
+    {
+        window->context.wgl.handle = wglCreateContext(window->context.wgl.dc);
+        if (!window->context.wgl.handle)
+        {
+            _glfwInputErrorWin32(GLFW_VERSION_UNAVAILABLE,
+                                 "WGL: Failed to create OpenGL context");
+            return GLFW_FALSE;
+        }
+
+        if (share)
+        {
+            if (!wglShareLists(share, window->context.wgl.handle))
+            {
+                _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
+                                     "WGL: Failed to enable sharing with specified OpenGL context");
+                return GLFW_FALSE;
+            }
+        }
+    }
+
+    window->context.makeCurrent = makeContextCurrentWGL;
+    window->context.swapBuffers = swapBuffersWGL;
+    window->context.swapInterval = swapIntervalWGL;
+    window->context.extensionSupported = extensionSupportedWGL;
+    window->context.getProcAddress = getProcAddressWGL;
+    window->context.destroy = destroyContextWGL;
+
+    return GLFW_TRUE;
+}
+
+#undef setAttrib
+
+
+//////////////////////////////////////////////////////////////////////////
+//////                        GLFW native API                       //////
+//////////////////////////////////////////////////////////////////////////
+
+GLFWAPI HGLRC glfwGetWGLContext(GLFWwindow* handle)
+{
+    _GLFWwindow* window = (_GLFWwindow*) handle;
+    _GLFW_REQUIRE_INIT_OR_RETURN(NULL);
+
+    if (window->context.source != GLFW_NATIVE_CONTEXT_API)
+    {
+        _glfwInputError(GLFW_NO_WINDOW_CONTEXT, NULL);
+        return NULL;
+    }
+
+    return window->context.wgl.handle;
+}
+