void WGL_CreateContext(HWND hWnd, const RenderSystem::Config & config)
{
gWGL.hwnd = hWnd;
gWGL.hdc = GetDC(hWnd);
WGL_Init();
WGL_SetPixelFormat(gWGL.hdc, config);
gWGL.hrc = wglCreateContext(gWGL.hdc);
d_assert (gWGL.hrc != NULL);
wglMakeCurrent(gWGL.hdc, gWGL.hrc);
}
static int LoadGL(const char *driver)
{
int colorbits = Cvar_ClampInteger(gl_colorbits, 0, 32);
int depthbits = Cvar_ClampInteger(gl_depthbits, 0, 32);
int stencilbits = Cvar_ClampInteger(gl_stencilbits, 0, 8);
int multisamples = Cvar_ClampInteger(gl_multisamples, 0, 32);
int ret;
// figure out if we're running on a minidriver or not
if (!Q_stricmp(driver, "opengl32") ||
!Q_stricmp(driver, "opengl32.dll")) {
glw.minidriver = qfalse;
} else {
Com_Printf("...running a minidriver: %s\n", driver);
glw.minidriver = qtrue;
}
// load the OpenGL library and bind to it
if (!WGL_Init(driver)) {
ReportLastError("WGL_Init");
return FAIL_SOFT;
}
// check if basic WGL entry points are present
if (!qwglCreateContext || !qwglMakeCurrent || !qwglDeleteContext) {
Com_EPrintf("Required WGL entry points are missing\n");
goto fail;
}
if (glw.minidriver) {
// check if MCD entry points are present if using a minidriver
if (!qwglChoosePixelFormat || !qwglSetPixelFormat ||
!qwglDescribePixelFormat || !qwglSwapBuffers) {
Com_EPrintf("Required MCD entry points are missing\n");
goto fail;
}
}
// check for WGL_ARB_multisample by creating a fake window
if (multisamples > 1) {
unsigned extensions = GetFakeWindowExtensions();
if (extensions & QWGL_ARB_multisample) {
if (qwglChoosePixelFormatARB) {
Com_Printf("...enabling WGL_ARB_multisample\n");
} else {
Com_Printf("...ignoring WGL_ARB_multisample, WGL_ARB_pixel_format not found\n");
Cvar_Set("gl_multisamples", "0");
multisamples = 0;
}
} else {
Com_Printf("WGL_ARB_multisample not found\n");
Cvar_Set("gl_multisamples", "0");
multisamples = 0;
}
}
// create window, choose PFD, setup OpenGL context
ret = SetupGL(colorbits, depthbits, stencilbits, multisamples);
// attempt to recover
if (ret == FAIL_SOFT && (colorbits || depthbits || stencilbits || multisamples > 1)) {
Cvar_Set("gl_multisamples", "0");
ret = SetupGL(0, 0, 0, 0);
}
if (ret)
goto fail;
return FAIL_OK;
fail:
// it failed, clean up
WGL_Shutdown();
return FAIL_SOFT;
}
