Java MemoryUtil类代码示例

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns the EGL surfaces used for rendering by the current context.
 * If there is no context current, null is returned.
 *
 * @param readdraw the read or draw surface
 *
 * @return the current surface
 *
 * @throws org.lwjgl.LWJGLException if an EGL error occurs
 */
public static EGLSurface eglGetCurrentSurface(int readdraw) throws LWJGLException {
	//LWJGLUtil.log("eglGetCurrentSurface");
	final long surface = neglGetCurrentSurface(readdraw);
	if ( surface == EGL_NO_SURFACE )
		return null;

	// Get current display
	EGLDisplay display = eglGetCurrentDisplay();

	// Query context's CONFIG_ID
	final IntBuffer attrib_list = APIUtil.getBufferInt();
	if ( !neglQuerySurface(display.getPointer(), surface, EGL_CONFIG_ID, MemoryUtil.getAddress0(attrib_list)) )
		throwEGLError("Failed to query surface EGL config ID.");

	final EGLConfig config = getEGLConfig(display, attrib_list);

	// Create the surface handle
	return new EGLSurface(display, config, surface);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
public static void setup(MappedObject mo, ByteBuffer buffer, int align, int sizeof) {
	if ( LWJGLUtil.CHECKS && mo.baseAddress != 0L )
		throw new IllegalStateException("this method should not be called by user-code");

	if ( LWJGLUtil.CHECKS && !buffer.isDirect() )
		throw new IllegalArgumentException("bytebuffer must be direct");
	mo.preventGC = buffer;

	if ( LWJGLUtil.CHECKS && align <= 0 )
		throw new IllegalArgumentException("invalid alignment");

	if ( LWJGLUtil.CHECKS && (sizeof <= 0 || sizeof % align != 0) )
		throw new IllegalStateException("sizeof not a multiple of alignment");

	long addr = MemoryUtil.getAddress(buffer);
	if ( LWJGLUtil.CHECKS && addr % align != 0 )
		throw new IllegalStateException("buffer address not aligned on " + align + " bytes");

	mo.baseAddress = mo.viewAddress = addr;
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
static void testConstructor() {
	int capacity = 1024;
	ByteBuffer bb = ByteBuffer.allocateDirect(capacity).order(ByteOrder.nativeOrder());
	long address = MemoryUtil.getAddress(bb);

	MappedFloat mf = MappedFloat.map(address, capacity);

	assert (address == mf.baseAddress);

	assert (mf.value == 0.0f);
	mf.view = 1;
	assert (mf.value == 0.0f);
	mf.runViewConstructor();
	assert (mf.value == 4.0f);

	Xyz.malloc(3);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns the current EGL context for the current rendering API.
 * If there is no context current, null is returned.
 *
 * @return the current context
 *
 * @throws org.lwjgl.LWJGLException if an EGL error occurs
 */
public static EGLContext eglGetCurrentContext() throws LWJGLException {
	//LWJGLUtil.log("eglGetCurrentContext");
	// Get current context
	final long ctx = neglGetCurrentContext();
	if ( ctx == EGL_NO_CONTEXT )
		return null;

	// Get current display
	final EGLDisplay display = eglGetCurrentDisplay();

	// Query context's CONFIG_ID
	final IntBuffer attrib_list = APIUtil.getBufferInt();
	neglQueryContext(display.getPointer(), ctx, EGL_CONFIG_ID, MemoryUtil.getAddress0(attrib_list));

	final EGLConfig config = getEGLConfig(display, attrib_list);

	// Create the context handle
	return new EGLContext(display, config, ctx);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
public static void testCacheLineAlignment() {
	MappedCacheLinePadded data = MappedCacheLinePadded.malloc(10);

	assert (data.backingByteBuffer().capacity() == 10 * CacheUtil.getCacheLineSize());
	assert (MemoryUtil.getAddress(data.backingByteBuffer()) % CacheUtil.getCacheLineSize() == 0);

	for ( int i = 0; i < 10; i++ ) {
		data.view = i;

		data.foo = i;
		data.bar = i * 2;
	}

	for ( int i = 0; i < 10; i++ ) {
		data.view = i;

		assert (data.foo == i);
		assert (data.bar == i * 2);
	}
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns the available EGLConfigs on the speficied display. The number of available EGLConfigs
 * is returned in the num_config parameter. The configs array may be null. If it is null, a new
 * array will be allocated, with size equal to the result of {@link #eglGetConfigsNum(EGLDisplay)}  eglGetConfigsNum}.
 * If it is not null, no more than {@code configs.length} EGLConfigs will be returned. If the array is bigger
 * than the number of available EGLConfigs, the remaining array elements will not be affected.
 *
 * @param dpy        the EGLDisplay
 * @param configs    the EGLConfigs array
 * @param num_config the number of available EGLConfigs returned
 *
 * @return the available EGLConfigs
 *
 * @throws org.lwjgl.LWJGLException if an EGL error occurs
 */
static EGLConfig[] eglGetConfigs(EGLDisplay dpy, EGLConfig[] configs, IntBuffer num_config) throws LWJGLException {
	//LWJGLUtil.log("eglGetConfigs");
	BufferChecks.checkBuffer(num_config, 1);

	if ( configs == null ) {
		if ( !neglGetConfigs(dpy.getPointer(), 0L, 0, MemoryUtil.getAddress(num_config)) )
			throwEGLError("Failed to get number of available EGL configs.");

		configs = new EGLConfig[num_config.get(num_config.position())];
	}

	final PointerBuffer configs_buffer = APIUtil.getBufferPointer(configs.length);
	if ( !neglGetConfigs(dpy.getPointer(), MemoryUtil.getAddress0(configs_buffer), configs.length, MemoryUtil.getAddress(num_config)) )
		throwEGLError("Failed to get EGL configs.");

	final int config_size = num_config.get(num_config.position());
	for ( int i = 0; i < config_size; i++ )
		configs[i] = new EGLConfig(dpy, configs_buffer.get(i));

	return configs;
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
public void setTitle(String title) {
	lockAWT();
	try {
		final ByteBuffer titleText = MemoryUtil.encodeUTF8(title);
		nSetTitle(getDisplay(), getWindow(), MemoryUtil.getAddress(titleText), titleText.remaining() - 1);
	} finally {
		unlockAWT();
	}
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns a buffer containing the specified strings as bytes.
 *
 * @param strings
 *
 * @return the Strings as a ByteBuffer
 */
static long getBuffer(final ContextCapabilities caps, final CharSequence[] strings) {
	final ByteBuffer buffer = getBufferByte(caps, getTotalLength(strings));

	for ( CharSequence string : strings )
		encode(buffer, string);

	buffer.flip();
	return MemoryUtil.getAddress0(buffer);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns a buffer containing the specified strings as bytes, including null-termination.
 *
 * @param strings
 *
 * @return the Strings as a ByteBuffer
 */
static long getBufferNT(final ContextCapabilities caps, final CharSequence[] strings) {
	final ByteBuffer buffer = getBufferByte(caps, getTotalLength(strings) + strings.length);

	for ( CharSequence string : strings ) {
		encode(buffer, string);
		buffer.put((byte)0);
	}

	buffer.flip();
	return MemoryUtil.getAddress0(buffer);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * Returns a buffer containing the lengths of the specified strings.
 *
 * @param strings
 *
 * @return the String lengths in an IntBuffer
 */
static long getLengths(final ContextCapabilities caps, final CharSequence[] strings) {
	IntBuffer buffer = getLengths(caps, strings.length);

	for ( CharSequence string : strings )
		buffer.put(string.length());

	buffer.flip();
	return MemoryUtil.getAddress0(buffer);
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/**
 * The <code>alcOpenDevice</code> function allows the application (i.e. the client program) to
* connect to a device (i.e. the server).
*
* If the function returns <code>null</code>, then no sound driver/device has been found. The
* argument is a null terminated string that requests a certain device or device
* configuration. If <code>null</code> is specified, the implementation will provide an
* implementation specific default.
 *
 * @param devicename name of device to open
 * @return opened device, or null
 */
public static ALCdevice alcOpenDevice(String devicename) {
	ByteBuffer buffer = MemoryUtil.encodeUTF8(devicename);
	long device_address = nalcOpenDevice(MemoryUtil.getAddressSafe(buffer));
	if(device_address != 0) {
		ALCdevice device = new ALCdevice(device_address);
		synchronized (ALC10.devices) {
			devices.put(device_address, device);
		}
		return device;
	}
	return null;
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
@Override
public void glCompressedTexImage3D(int target, int level, int internalformat,
                                   int width, int height, int depth, int border,
                                   int imageSize, Buffer data) {
  GL13.glCompressedTexImage3D(target, level, internalformat, width, height, depth, border,
                              imageSize, MemoryUtil.getAddress((ByteBuffer) data));
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
private static IntBuffer getMemory(final int START_SIZE) {
	final int PAGE_SIZE = MappedObjectUnsafe.INSTANCE.pageSize();

	final ByteBuffer buffer = ByteBuffer.allocateDirect((START_SIZE * 4) + PAGE_SIZE).order(ByteOrder.nativeOrder());

	// Align to page and, consequently, to cache line. Otherwise results will be inconsistent.
	if ( MemoryUtil.getAddress(buffer) % PAGE_SIZE != 0 ) {
		// Round up to page boundary
		buffer.position(PAGE_SIZE - (int)(MemoryUtil.getAddress(buffer) & (PAGE_SIZE - 1)));
	}

	return buffer.asIntBuffer();
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
/** the WM_CLASS hint is needed by some WM's e.g. gnome shell */
private void setClassHint(String wm_name, String wm_class) {
	lockAWT();
	try {
		final ByteBuffer nameText = MemoryUtil.encodeUTF8(wm_name);
		final ByteBuffer classText = MemoryUtil.encodeUTF8(wm_class);
		
		nSetClassHint(getDisplay(), getWindow(), MemoryUtil.getAddress(nameText), MemoryUtil.getAddress(classText));
	} finally {
		unlockAWT();
	}
}
 

import org.lwjgl.MemoryUtil; //导入依赖的package包/类
public void setTitle(String title) {
	lockAWT();
	try {
		final ByteBuffer titleText = MemoryUtil.encodeUTF8(title);
		nSetTitle(getDisplay(), getWindow(), MemoryUtil.getAddress(titleText), titleText.remaining() - 1);
	} finally {
		unlockAWT();
	}
	
	// also update the class hint value as some WM's use it for the window title
	if (Display.isCreated()) setClassHint(title, wm_class);
}