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/*
* Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*
* Sun gratefully acknowledges that this software was originally authored
* and developed by Kenneth Bradley Russell and Christopher John Kline.
*/
package com.sun.opengl.impl.macosx;
import javax.media.opengl.*;
import com.sun.opengl.impl.*;
public class MacOSXPbufferGLDrawable extends MacOSXGLDrawable {
private static final boolean DEBUG = Debug.debug("MacOSXPbufferGLContext");
protected int initWidth;
protected int initHeight;
protected long pBuffer;
protected int width;
protected int height;
// State for render-to-texture and render-to-texture-rectangle support
private int textureTarget; // e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_NV
private int texture; // actual texture object
public MacOSXPbufferGLDrawable(GLCapabilities capabilities, int initialWidth, int initialHeight) {
super(capabilities, null);
this.initWidth = initialWidth;
this.initHeight = initialHeight;
createPbuffer();
}
public GLContext createContext(GLContext shareWith) {
return new MacOSXPbufferGLContext(this, shareWith);
}
public void destroy() {
if (this.pBuffer != 0) {
CGL.destroyPBuffer(0, pBuffer);
this.pBuffer = 0;
if (DEBUG) {
System.err.println("Destroyed pbuffer " + width + " x " + height);
}
}
}
public void setSize(int width, int height) {
// FIXME
throw new GLException("Not yet implemented");
}
public int getWidth() {
return width;
}
public int getHeight() {
return height;
}
public GLCapabilities getCapabilities() {
return capabilities;
}
public long getPbuffer() {
return pBuffer;
}
public void swapBuffers() throws GLException {
// FIXME: do we need to do anything if the pbuffer is double-buffered?
}
protected void createPbuffer() {
int renderTarget;
if (capabilities.getPbufferRenderToTextureRectangle()) {
width = initWidth;
height = initHeight;
renderTarget = GL.GL_TEXTURE_RECTANGLE_EXT;
} else {
width = getNextPowerOf2(initWidth);
height = getNextPowerOf2(initHeight);
renderTarget = GL.GL_TEXTURE_2D;
}
int internalFormat = GL.GL_RGBA;
if (capabilities.getPbufferFloatingPointBuffers()) {
// FIXME: want to check availability of GL_APPLE_float_pixels
// extension, but need valid OpenGL context in order to do so --
// in worst case would need to create dummy window / GLCanvas
// (undesirable) -- could maybe also do this with pbuffers
/*
if (!gl.isExtensionAvailable("GL_APPLE_float_pixels")) {
throw new GLException("Floating-point support (GL_APPLE_float_pixels) not available");
}
*/
switch (capabilities.getRedBits()) {
case 16: internalFormat = GL.GL_RGBA_FLOAT16_APPLE; break;
case 32: internalFormat = GL.GL_RGBA_FLOAT32_APPLE; break;
default: throw new GLException("Invalid floating-point bit depth (only 16 and 32 supported)");
}
}
pBuffer = CGL.createPBuffer(renderTarget, internalFormat, width, height);
if (pBuffer == 0) {
throw new GLException("pbuffer creation error: CGL.createPBuffer() failed");
}
if (DEBUG) {
System.err.println("Created pbuffer 0x" + toHexString(pBuffer) + ", " + width + " x " + height + " for " + this);
}
}
private int getNextPowerOf2(int number) {
if (((number-1) & number) == 0) {
//ex: 8 -> 0b1000; 8-1=7 -> 0b0111; 0b1000&0b0111 == 0
return number;
}
int power = 0;
while (number > 0) {
number = number>>1;
power++;
}
return (1<<power);
}
}
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