Java GL2.glGetIntegerv方法代碼示例

import javax.media.opengl.GL2; //導入方法依賴的package包/類
public void reshape(GLAutoDrawable drawable, int x, int y, int width,
		int height) {
	GL2 gl = drawable.getGL().getGL2();
	this.drawable = drawable;
	this.width = width;
	this.height = height;

	gl.glMatrixMode(GL2.GL_PROJECTION);
	gl.glLoadIdentity();
	gl.glOrtho(0, width, height, 0, -1, 1);
	gl.glViewport(0, 0, width, height);

	gl.glGetDoublev(GL2.GL_MODELVIEW_MATRIX, modelview);
	gl.glGetDoublev(GL2.GL_PROJECTION_MATRIX, projection);
	gl.glGetIntegerv(GL2.GL_VIEWPORT, viewport);
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
private Map<String, Object> setBlending() {
  Map<String, Object> result = new HashMap<>();
  GL2 gl = drawable.getGL().getGL2();

  IntBuffer equation = Buffers.newDirectIntBuffer(1);
  gl.glGetIntegerv(GL_BLEND_EQUATION, equation);
  result.put("equation", equation);

  IntBuffer sourceFactor = Buffers.newDirectIntBuffer(1);
  gl.glGetIntegerv(GL_BLEND_SRC, sourceFactor);
  result.put("sourceFactor", sourceFactor);

  IntBuffer destinationFactor = Buffers.newDirectIntBuffer(1);
  gl.glGetIntegerv(GL_BLEND_DST, destinationFactor);
  result.put("destinationFactor", destinationFactor);

  boolean enabled = gl.glIsEnabled(GL_BLEND);
  result.put("enabled", enabled);

  gl.glBlendFunc(GL_SRC_ALPHA, GL_ONE);
  gl.glBlendEquation(GL_FUNC_ADD);
  gl.glEnable(GL_BLEND);

  return result;
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
/**
 * Apply the camera to a GL context.
 * 
 * @param gl GL context.
 */
public void apply(GL2 gl) {
  // 3D projection
  gl.glMatrixMode(GL2.GL_PROJECTION);
  gl.glLoadIdentity();
  // Perspective.
  glu.gluPerspective(35, ratio, 1, 1000);
  glu.gluLookAt(distance * sinZ, distance * -cosZ, height, // pos
      0, 0, .5, // center
      0, 0, 1 // up
  );
  // Change back to model view matrix.
  gl.glMatrixMode(GL2.GL_MODELVIEW);
  gl.glLoadIdentity();

  // Store the matrixes for reference.
  gl.glGetIntegerv(GL.GL_VIEWPORT, viewp, 0);
  gl.glGetDoublev(GLMatrixFunc.GL_MODELVIEW_MATRIX, modelview, 0);
  gl.glGetDoublev(GLMatrixFunc.GL_PROJECTION_MATRIX, projection, 0);
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
/**
 * Dumps the current modelview and perspective.
 */
public static void logStack(final DrawContext dc, final String logId) {

	final GL2 gl = dc.getGL().getGL2();

	final IntBuffer depthModel = IntBuffer.allocate(1);
	final IntBuffer depthPerspective = IntBuffer.allocate(1);

	gl.glGetIntegerv(GL2.GL_MODELVIEW_STACK_DEPTH, depthModel);
	gl.glGetIntegerv(GL2.GL_PROJECTION_STACK_DEPTH, depthPerspective);

	System.out.println((UI.timeStampNano() + " [" + logId + "]\t") //$NON-NLS-1$ //$NON-NLS-2$
			+ ("GL_MODELVIEW_STACK_DEPTH:\t" + depthModel.get(0)) //$NON-NLS-1$
			+ "\t\t" //$NON-NLS-1$
			+ ("GL_PROJECTION_STACK_DEPTH:\t" + depthPerspective.get(0)) //$NON-NLS-1$
			+ "\t" //$NON-NLS-1$
			+ getGLErrors(dc)
	//
			);
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
protected DoubleBuffer get2dPoint( final GL2 gl, final double x, final double y, final double z )
{
	final DoubleBuffer model = DoubleBuffer.allocate(16);
	gl.glGetDoublev( GLMatrixFunc.GL_MODELVIEW_MATRIX, model );

	final DoubleBuffer proj = DoubleBuffer.allocate(16);
	gl.glGetDoublev( GLMatrixFunc.GL_PROJECTION_MATRIX, proj );

	final IntBuffer view = IntBuffer.allocate(4);
	gl.glGetIntegerv( GL.GL_VIEWPORT, view );

	final DoubleBuffer winPos = DoubleBuffer.allocate(3);
	final boolean b = this.glu.gluProject( x, y, z, model, proj, view, winPos );

	if( !b ) System.out.println( "FAIL ");
	return winPos;
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
public void display(GLAutoDrawable drawable) 
{
  GL2 gl = drawable.getGL().getGL2();
  switch(cmd)
    {
    case UPDATE:
      drawScene(gl);
      break;
    case SELECT:
      int buffsize = 512;
      double x = (double) mouse_x, y = (double) mouse_y;
      int[] viewPort = new int[4];
      IntBuffer selectBuffer = Buffers.newDirectIntBuffer(buffsize);
      int hits = 0;
      gl.glGetIntegerv(GL2.GL_VIEWPORT, viewPort, 0);
      gl.glSelectBuffer(buffsize, selectBuffer);
      gl.glRenderMode(GL2.GL_SELECT);
      gl.glInitNames();
      gl.glMatrixMode(GL2.GL_PROJECTION);
      gl.glPushMatrix();
      gl.glLoadIdentity();
      glu.gluPickMatrix(x, (double) viewPort[3] - y, 5.0d, 5.0d, viewPort, 0);
      glu.gluOrtho2D(0.0d, 1.0d, 0.0d, 1.0d);
      drawScene(gl);
      gl.glMatrixMode(GL2.GL_PROJECTION);
      gl.glPopMatrix();
      gl.glFlush();
      hits = gl.glRenderMode(GL2.GL_RENDER);
      processHits(hits, selectBuffer);
      cmd = UPDATE;
      break;
    }
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
private void beginDrawLasso(DrawContext dc) {
	//GL gl = dc.getGL();
	GL2 gl = dc.getGL().getGL2(); // GL initialization checks for GL2 compatibility.

	int attributeMask =
		GL.GL_DEPTH_BUFFER_BIT // for depth test, depth mask and depth func
			| GL2.GL_TRANSFORM_BIT // for modelview and perspective
			| GL2.GL_VIEWPORT_BIT // for depth range
			| GL2.GL_CURRENT_BIT // for current color
			| GL2.GL_COLOR_BUFFER_BIT // for alpha test func and ref, and blend
			| GL2.GL_DEPTH_BUFFER_BIT // for depth func
			| GL2.GL_ENABLE_BIT; // for enable/disable changes
	gl.glPushAttrib(attributeMask);

	// Apply the depth buffer but don't change it.
	gl.glEnable(GL.GL_DEPTH_TEST);
	gl.glDepthFunc(GL.GL_ALWAYS);
	gl.glDepthMask(false);

	// Load a parallel projection with dimensions (viewportWidth, viewportHeight)
	int[] viewport = new int[4];
	gl.glGetIntegerv(GL.GL_VIEWPORT, viewport, 0);
	gl.glMatrixMode(GL2.GL_PROJECTION);
	gl.glPushMatrix();
	gl.glLoadIdentity();
	gl.glOrtho(0d, viewport[2], 0d, viewport[3], -1d, 1d);

	gl.glMatrixMode(GL2.GL_MODELVIEW);
	gl.glPushMatrix();
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
public void display(GLAutoDrawable drawable) {
	GL2 gl = drawable.getGL().getGL2();
	this.drawable = drawable;

	// Apply transformations
	double transx = -origin.getX(), transy = -origin.getY();

	gl.glMatrixMode(GL2.GL_PROJECTION);
	gl.glLoadIdentity();
	gl.glOrtho(0, width, height, 0, -1, 1);
	gl.glViewport(0, 0, width, height);

	gl.glTranslated(transx + zoomPos.getX(), transy + zoomPos.getY(), 0);
	gl.glScaled(scaleFactor, scaleFactor, 1);
	gl.glTranslated(-zoomPos.getX(), -zoomPos.getY(), 0);

	gl.glGetDoublev(GL2.GL_MODELVIEW_MATRIX, modelview);
	gl.glGetDoublev(GL2.GL_PROJECTION_MATRIX, projection);
	gl.glGetIntegerv(GL2.GL_VIEWPORT, viewport);
	gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);

	// Draw edges, arrows and vertices
	edgeRenderer.transform(transx, transy, scaleFactor);
	edgeRenderer.render();

	if (animateLabels) {
		labelRenderer.scale(scaleFactor);
		labelRenderer.drawLabels();
	}

	vertexRenderer.transform(transx, transy, scaleFactor);
	vertexRenderer.render();
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
public int viewPortWidth(GL2 gl)
{
  int[] viewPort = new int[4];
  gl.glGetIntegerv(GL2.GL_VIEWPORT, viewPort, 0);
  return viewPort[2];
}
 

import javax.media.opengl.GL2; //導入方法依賴的package包/類
public int viewPortHeight(GL2 gl)
{
  int[] viewPort = new int[4];
  gl.glGetIntegerv(GL2.GL_VIEWPORT, viewPort, 0);
  return viewPort[3];
}
 

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;
}