// 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 (!_glfw.wgl.extensionsLoaded)
loadWGLExtensions();
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, fbconfig);
if (!pixelFormat)
return GLFW_FALSE;
if (!DescribePixelFormat(window->context.wgl.dc,
pixelFormat, sizeof(pfd), &pfd))
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"WGL: Failed to retrieve PFD for selected pixel format");
return GLFW_FALSE;
}
if (!SetPixelFormat(window->context.wgl.dc, pixelFormat, &pfd))
{
_glfwInputError(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->noerror)
flags |= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
if (ctxconfig->robustness)
{
if (_glfw.wgl.ARB_create_context_robustness)
{
if (ctxconfig->robustness == GLFW_NO_RESET_NOTIFICATION)
{
setWGLattrib(WGL_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB,
WGL_NO_RESET_NOTIFICATION_ARB);
}
else if (ctxconfig->robustness == GLFW_LOSE_CONTEXT_ON_RESET)
{
setWGLattrib(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)
{
setWGLattrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
WGL_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB);
}
else if (ctxconfig->release == GLFW_RELEASE_BEHAVIOR_FLUSH)
{
setWGLattrib(WGL_CONTEXT_RELEASE_BEHAVIOR_ARB,
WGL_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB);
}
}
}
// 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)
{
setWGLattrib(WGL_CONTEXT_MAJOR_VERSION_ARB, ctxconfig->major);
setWGLattrib(WGL_CONTEXT_MINOR_VERSION_ARB, ctxconfig->minor);
}
if (flags)
setWGLattrib(WGL_CONTEXT_FLAGS_ARB, flags);
if (mask)
setWGLattrib(WGL_CONTEXT_PROFILE_MASK_ARB, mask);
setWGLattrib(0, 0);
window->context.wgl.handle =
_glfw.wgl.CreateContextAttribsARB(window->context.wgl.dc,
share, attribs);
if (!window->context.wgl.handle)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: Failed to create OpenGL context");
return GLFW_FALSE;
}
}
else
{
window->context.wgl.handle = wglCreateContext(window->context.wgl.dc);
if (!window->context.wgl.handle)
{
_glfwInputError(GLFW_VERSION_UNAVAILABLE,
"WGL: Failed to create OpenGL context");
return GLFW_FALSE;
}
if (share)
{
if (!wglShareLists(share, window->context.wgl.handle))
{
_glfwInputError(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;
}
// Analyzes the specified context for possible recreation
//
bool
OSGLContext_win::analyzeContextWGL(const FramebufferConfig& pixelFormatAttrs,
int major,
int minor)
{
bool required = false;
OSGLContext_wgl_data* wglInfo = const_cast<OSGLContext_wgl_data*>( appPTR->getWGLData() );
assert(wglInfo);
makeContextCurrent(this);
if ( !loadWGLExtensions(wglInfo) ) {
return false;
}
/*
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_RECREATION_IMPOSSIBLE;
}
required = GLFW_TRUE;
}
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_RECREATION_IMPOSSIBLE;
}
required = GLFW_TRUE;
}
if (ctxconfig->release)
{
if (_glfw.wgl.ARB_context_flush_control)
required = GLFW_TRUE;
}
*/
if ( (major != 1) || (minor != 0) ) {
if (wglInfo->ARB_create_context) {
required = true;
}
}
/*if (ctxconfig->debug)
{
if (_glfw.wgl.ARB_create_context)
required = GLFW_TRUE;
}*/
if (pixelFormatAttrs.samples > 0) {
// MSAA is not a hard constraint, so do nothing if it's not supported
if (wglInfo->ARB_multisample && wglInfo->ARB_pixel_format) {
required = true;
}
}
if (pixelFormatAttrs.sRGB) {
// sRGB is not a hard constraint, so do nothing if it's not supported
if ( (wglInfo->ARB_framebuffer_sRGB ||
wglInfo->EXT_framebuffer_sRGB) &&
wglInfo->ARB_pixel_format ) {
required = true;
}
}
return required;
}
