本文整理匯總了Java中javax.media.opengl.GL2.glReadBuffer方法的典型用法代碼示例。如果您正苦於以下問題：Java GL2.glReadBuffer方法的具體用法？Java GL2.glReadBuffer怎麽用？Java GL2.glReadBuffer使用的例子？那麽, 這裏精選的方法代碼示例或許可以為您提供幫助。您也可以進一步了解該方法所在類javax.media.opengl.GL2的用法示例。
在下文中一共展示了GL2.glReadBuffer方法的1個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Java代碼示例。
示例1: screenshot
import javax.media.opengl.GL2; //導入方法依賴的package包/類
/**
* Takes a "screenshot" (i.e. a snapshot of the current frame buffer) from
* the OpenGL context. The format is: 3 bytes, three channels (BGR).
*
* @param gl
* The OpenGL context to access the frame buffer.
*/
public static BufferedImage screenshot(GL2 gl) {
BufferedImage image;
int[] readBufferName = new int[1];
int[] pixelStoreSwapBytes = new int[1];
int[] pixelStoreLength = new int[1];
int[] pixelStoreRows = new int[1];
int[] pixelStorePixels = new int[1];
int[] pixelStoreAlignment = new int[1];
// There is no glPushAttrib() Argument which saves pixel store flags.
// All this flags must be saved/restored manually. I know,
// glReadBuffer()
// can be pushed (GL_PIXEL_MODE_BIT).
gl.glGetIntegerv(GL2.GL_READ_BUFFER, readBufferName, 0);
gl.glGetIntegerv(GL2.GL_PACK_ALIGNMENT, pixelStoreAlignment, 0);
gl.glGetIntegerv(GL2.GL_PACK_SKIP_ROWS, pixelStoreRows, 0);
gl.glGetIntegerv(GL2.GL_PACK_SKIP_PIXELS, pixelStorePixels, 0);
gl.glGetIntegerv(GL2.GL_PACK_SWAP_BYTES, pixelStoreSwapBytes, 0);
gl.glGetIntegerv(GL2.GL_PACK_ROW_LENGTH, pixelStoreLength, 0);
// Get size of viewport.
int[] viewport = new int[4];
gl.glGetIntegerv(GL2.GL_VIEWPORT, viewport, 0);
int width = viewport[2];
int height = viewport[3];
// Create the client side image.
// Reserve 3 bytes for each pixel (BGR). Pixel number: width * height.
int bytes = width * height * 3;
image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
ByteBuffer data = ByteBuffer.allocate(bytes);
// Select buffer and set pixel storage parameters
gl.glReadBuffer(GL2.GL_FRONT);
gl.glPixelStorei(GL2.GL_PACK_ALIGNMENT, 1);
gl.glPixelStorei(GL2.GL_PACK_SKIP_ROWS, 0);
gl.glPixelStorei(GL2.GL_PACK_SKIP_PIXELS, 0);
gl.glPixelStorei(GL2.GL_PACK_SWAP_BYTES, GL2.GL_FALSE);
gl.glPixelStorei(GL2.GL_PACK_ROW_LENGTH, width);
// Read whole frame buffer data.
gl.glReadPixels(0, 0, width, height, GL2.GL_BGR, GL2.GL_UNSIGNED_BYTE,
data);
// Restore state changes.
gl.glPixelStorei(GL2.GL_PACK_ROW_LENGTH, pixelStoreLength[0]);
gl.glPixelStorei(GL2.GL_PACK_SWAP_BYTES, pixelStoreSwapBytes[0]);
gl.glPixelStorei(GL2.GL_PACK_SKIP_PIXELS, pixelStorePixels[0]);
gl.glPixelStorei(GL2.GL_PACK_SKIP_ROWS, pixelStoreRows[0]);
gl.glPixelStorei(GL2.GL_PACK_ALIGNMENT, pixelStoreAlignment[0]);
gl.glReadBuffer(readBufferName[0]);
// Copy the pixel data to a BufferedImage data buffer.
byte[] bufferedImageData = ((DataBufferByte) image.getRaster()
.getDataBuffer()).getData();
int srcOffset = 0;
int numOfBytesPerRow = width * 3;
int destOffset = numOfBytesPerRow * (height - 1);
for (int y = 0; y < height; y++) {
System.arraycopy(data.array(), srcOffset, bufferedImageData,
destOffset, numOfBytesPerRow);
srcOffset += numOfBytesPerRow;
destOffset -= numOfBytesPerRow;
}
Logger.getInstance().message("Toke Screenshot.");
return image;
}