int findPixelFormatOnDC(JNIEnv *env, HDC hdc, int origin_x, int origin_y, jobject pixel_format, jobject pixelFormatCaps, bool use_hdc_bpp, bool window, bool pbuffer, bool double_buffer) {
HGLRC dummy_hglrc;
HDC saved_current_hdc;
HGLRC saved_current_hglrc;
WGLExtensions extensions;
HWND dummy_hwnd;
HDC dummy_hdc;
int pixel_format_id;
jclass cls_pixel_format = (*env)->GetObjectClass(env, pixel_format);
int samples = (int)(*env)->GetIntField(env, pixel_format, (*env)->GetFieldID(env, cls_pixel_format, "samples", "I"));
int colorSamples = (int)(*env)->GetIntField(env, pixel_format, (*env)->GetFieldID(env, cls_pixel_format, "colorSamples", "I"));
bool floating_point = (bool)(*env)->GetBooleanField(env, pixel_format, (*env)->GetFieldID(env, cls_pixel_format, "floating_point", "Z"));
bool floating_point_packed = (bool)(*env)->GetBooleanField(env, pixel_format, (*env)->GetFieldID(env, cls_pixel_format, "floating_point_packed", "Z"));
bool sRGB = (bool)(*env)->GetBooleanField(env, pixel_format, (*env)->GetFieldID(env, cls_pixel_format, "sRGB", "Z"));
bool use_arb_selection = samples > 0 || floating_point || floating_point_packed || sRGB || pbuffer || pixelFormatCaps != NULL;
pixel_format_id = findPixelFormatDefault(env, hdc, pixel_format, use_hdc_bpp, double_buffer);
if (!(*env)->ExceptionOccurred(env) && use_arb_selection) {
dummy_hwnd = createDummyWindow(origin_x, origin_y);
if (dummy_hwnd == NULL) {
throwException(env, "Could not create dummy window");
return -1;
}
dummy_hdc = GetDC(dummy_hwnd);
if (!applyPixelFormat(env, dummy_hdc, pixel_format_id)) {
closeWindow(&dummy_hwnd, &dummy_hdc);
return -1;
}
dummy_hglrc = wglCreateContext(dummy_hdc);
if (dummy_hglrc == NULL) {
closeWindow(&dummy_hwnd, &dummy_hdc);
throwException(env, "Failed to create OpenGL rendering context");
return -1;
}
// Save the current HDC and HGLRC to avoid disruption
saved_current_hdc = wglGetCurrentDC();
saved_current_hglrc = wglGetCurrentContext();
if (validateAndGetExtensions(env, &extensions, dummy_hdc, dummy_hglrc, samples, colorSamples, floating_point, floating_point_packed, sRGB, pixelFormatCaps)) {
pixel_format_id = findPixelFormatARB(env, hdc, &extensions, pixel_format, pixelFormatCaps, use_hdc_bpp, window, pbuffer, double_buffer);
}
wglMakeCurrent(saved_current_hdc, saved_current_hglrc);
wglDeleteContext(dummy_hglrc);
closeWindow(&dummy_hwnd, &dummy_hdc);
}
return pixel_format_id;
}
static bool getExtensions(JNIEnv *env, WGLExtensions *extensions, jobject pixel_format, jobject pixelFormatCaps) {
int origin_x = 0; int origin_y = 0;
HWND dummy_hwnd;
HDC dummy_hdc;
HGLRC dummy_context;
HDC saved_hdc;
HGLRC saved_context;
int pixel_format_id;
dummy_hwnd = createDummyWindow(origin_x, origin_y);
if (dummy_hwnd == NULL) {
throwException(env, "Could not create dummy window");
return false;
}
dummy_hdc = GetDC(dummy_hwnd);
pixel_format_id = findPixelFormatOnDC(env, dummy_hdc, origin_x, origin_y, pixel_format, pixelFormatCaps, false, true, false, false);
if (pixel_format_id == -1) {
closeWindow(&dummy_hwnd, &dummy_hdc);
return false;
}
if (!applyPixelFormat(env, dummy_hdc, pixel_format_id)) {
closeWindow(&dummy_hwnd, &dummy_hdc);
return false;
}
dummy_context = wglCreateContext(dummy_hdc);
if (dummy_context == NULL) {
closeWindow(&dummy_hwnd, &dummy_hdc);
throwException(env, "Could not create dummy context");
return false;
}
saved_hdc = wglGetCurrentDC();
saved_context = wglGetCurrentContext();
if (!wglMakeCurrent(dummy_hdc, dummy_context)) {
wglMakeCurrent(saved_hdc, saved_context);
closeWindow(&dummy_hwnd, &dummy_hdc);
wglDeleteContext(dummy_context);
throwException(env, "Could not make dummy context current");
return false;
}
extgl_InitWGL(extensions);
if (!wglMakeCurrent(saved_hdc, saved_context))
printfDebugJava(env, "ERROR: Could not restore current context");
closeWindow(&dummy_hwnd, &dummy_hdc);
wglDeleteContext(dummy_context);
return true;
}
JNIEXPORT void JNICALL Java_org_lwjgl_opengl_WindowsPeerInfo_setPixelFormat
(JNIEnv *env, jclass clazz, jlong hdc_ptr, jint pixel_format) {
HDC hdc = (HDC)(INT_PTR)hdc_ptr;
applyPixelFormat(env, hdc, pixel_format);
}
