/**
* Attempts to initialize GLX and the core OpenGL library. For this method
* to return JNI_TRUE, the following must be true:
* - libGL must be loaded successfully (via dlopen)
* - all function symbols from libGL must be available and loaded properly
* - the GLX extension must be available through X11
* - client GLX version must be >= 1.3
* If any of these requirements are not met, this method will return
* JNI_FALSE, indicating there is no hope of using GLX/OpenGL for any
* GraphicsConfig in the environment.
*/
static jboolean
GLXGC_InitGLX()
{
int errorbase, eventbase;
const char *version;
J2dRlsTraceLn(J2D_TRACE_INFO, "GLXGC_InitGLX");
if (!OGLFuncs_OpenLibrary()) {
return JNI_FALSE;
}
if (!OGLFuncs_InitPlatformFuncs() ||
!OGLFuncs_InitBaseFuncs() ||
!OGLFuncs_InitExtFuncs())
{
OGLFuncs_CloseLibrary();
return JNI_FALSE;
}
if (!j2d_glXQueryExtension(awt_display, &errorbase, &eventbase)) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"GLXGC_InitGLX: GLX extension is not present");
OGLFuncs_CloseLibrary();
return JNI_FALSE;
}
version = j2d_glXGetClientString(awt_display, GLX_VERSION);
if (version == NULL) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"GLXGC_InitGLX: could not query GLX version");
OGLFuncs_CloseLibrary();
return JNI_FALSE;
}
// we now only verify that the client GLX version is >= 1.3 (if the
// server does not support GLX 1.3, then we will find that out later
// when we attempt to create a GLXFBConfig)
J2dRlsTraceLn1(J2D_TRACE_INFO,
"GLXGC_InitGLX: client GLX version=%s", version);
if (!((version[0] == '1' && version[2] >= '3') || (version[0] > '1'))) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"GLXGC_InitGLX: invalid GLX version; 1.3 is required");
OGLFuncs_CloseLibrary();
return JNI_FALSE;
}
return JNI_TRUE;
}
/**
* Initializes the extension function pointers for the given device. Note
* that under WGL, extension functions have different entrypoints depending
* on the device, so we must first make a context current for the given
* device before attempting to load the function pointers via
* wglGetProcAddress.
*
* REMIND: ideally the extension function pointers would not be global, but
* rather would be stored in a structure associated with the
* WGLGraphicsConfig, so that we use the correct function entrypoint
* depending on the destination device...
*/
static jboolean
WGLGC_InitExtFuncs(jint screennum)
{
HWND hwnd;
HDC hdc;
HGLRC context;
J2dTraceLn(J2D_TRACE_INFO, "WGLGC_InitExtFuncs");
// create a scratch window
hwnd = WGLGC_CreateScratchWindow(screennum);
if (hwnd == 0) {
return JNI_FALSE;
}
// get the HDC for the scratch window
hdc = GetDC(hwnd);
if (hdc == 0) {
DestroyWindow(hwnd);
return JNI_FALSE;
}
// find and set a basic pixel format for the scratch window
if (!WGLGC_SetBasicPixelFormatForDC(hdc)) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"WGLGC_InitExtFuncs: could not find appropriate pixfmt");
ReleaseDC(hwnd, hdc);
DestroyWindow(hwnd);
return JNI_FALSE;
}
// create a temporary context
context = j2d_wglCreateContext(hdc);
if (context == 0) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"WGLGC_InitExtFuncs: could not create temp WGL context");
ReleaseDC(hwnd, hdc);
DestroyWindow(hwnd);
return JNI_FALSE;
}
// make the context current so that we can load the function pointers
// using wglGetProcAddress
if (!j2d_wglMakeCurrent(hdc, context)) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"WGLGC_InitExtFuncs: could not make temp context current");
j2d_wglDeleteContext(context);
ReleaseDC(hwnd, hdc);
DestroyWindow(hwnd);
return JNI_FALSE;
}
if (!OGLFuncs_InitExtFuncs()) {
J2dRlsTraceLn(J2D_TRACE_ERROR,
"WGLGC_InitExtFuncs: could not initialize extension funcs");
j2d_wglMakeCurrent(NULL, NULL);
j2d_wglDeleteContext(context);
ReleaseDC(hwnd, hdc);
DestroyWindow(hwnd);
return JNI_FALSE;
}
// destroy the temporary resources
j2d_wglMakeCurrent(NULL, NULL);
j2d_wglDeleteContext(context);
ReleaseDC(hwnd, hdc);
DestroyWindow(hwnd);
return JNI_TRUE;
}
