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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.windows;
import javax.media.opengl.*;
import com.sun.opengl.impl.*;
public class WindowsPbufferGLContext extends WindowsGLContext {
private static final boolean DEBUG = Debug.debug("WindowsPbufferGLContext");
// State for render-to-texture and render-to-texture-rectangle support
private WindowsPbufferGLDrawable drawable;
private boolean rtt; // render-to-texture?
private boolean hasRTT; // render-to-texture extension available?
private boolean rect; // render-to-texture-rectangle?
private int textureTarget; // e.g. GL_TEXTURE_2D, GL_TEXTURE_RECTANGLE_NV
private int texture; // actual texture object
public WindowsPbufferGLContext(WindowsPbufferGLDrawable drawable,
GLContext shareWith) {
super(drawable, shareWith);
this.drawable = drawable;
}
public void bindPbufferToTexture() {
if (!rtt) {
throw new GLException("Shouldn't try to bind a pbuffer to a texture if render-to-texture hasn't been " +
"specified in its GLCapabilities");
}
GL gl = getGL();
WGLExt wglExt = getWGLExt();
gl.glBindTexture(textureTarget, texture);
if (rtt && hasRTT) {
if (!wglExt.wglBindTexImageARB(drawable.getPbuffer(), WGLExt.WGL_FRONT_LEFT_ARB)) {
throw new GLException("Binding of pbuffer to texture failed: " + wglGetLastError());
}
}
// FIXME: comment is wrong now
// Note that if the render-to-texture extension is not supported,
// we perform a glCopyTexImage2D in swapBuffers().
}
public void releasePbufferFromTexture() {
if (!rtt) {
throw new GLException("Shouldn't try to bind a pbuffer to a texture if render-to-texture hasn't been " +
"specified in its GLCapabilities");
}
if (rtt && hasRTT) {
WGLExt wglExt = getWGLExt();
if (!wglExt.wglReleaseTexImageARB(drawable.getPbuffer(), WGLExt.WGL_FRONT_LEFT_ARB)) {
throw new GLException("Releasing of pbuffer from texture failed: " + wglGetLastError());
}
}
}
protected int makeCurrentImpl() throws GLException {
if (drawable.getHDC() == 0) {
// pbuffer not instantiated (yet?)
if (DEBUG) {
System.err.println("pbuffer not instantiated");
}
return CONTEXT_NOT_CURRENT;
}
int res = super.makeCurrentImpl();
if (DEBUG && VERBOSE) {
System.err.println("WindowsPbufferGLContext: super.makeCurrentImpl() = " + res);
}
if (res == CONTEXT_CURRENT_NEW) {
GLCapabilities capabilities = drawable.getCapabilities();
// Initialize render-to-texture support if requested
rtt = capabilities.getOffscreenRenderToTexture();
rect = capabilities.getOffscreenRenderToTextureRectangle();
GL gl = getGL();
if (rtt) {
if (DEBUG) {
System.err.println("Initializing render-to-texture support");
}
if (!gl.isExtensionAvailable("WGL_ARB_render_texture")) {
System.err.println("WindowsPbufferGLContext: WARNING: WGL_ARB_render_texture extension not " +
"supported; implementing render_to_texture support using slow texture readback");
} else {
hasRTT = true;
if (rect && !gl.isExtensionAvailable("GL_NV_texture_rectangle")) {
System.err.println("WindowsPbufferGLContext: WARNING: GL_NV_texture_rectangle extension not " +
"supported; skipping requested render_to_texture_rectangle support for pbuffer");
rect = false;
}
if (rect) {
if (DEBUG) {
System.err.println(" Using render-to-texture-rectangle");
}
textureTarget = GL.GL_TEXTURE_RECTANGLE_NV;
} else {
if (DEBUG) {
System.err.println(" Using vanilla render-to-texture");
}
textureTarget = GL.GL_TEXTURE_2D;
}
int[] tmp = new int[1];
gl.glGenTextures(1, tmp, 0);
texture = tmp[0];
gl.glBindTexture(textureTarget, texture);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP_TO_EDGE);
gl.glTexParameteri(textureTarget, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP_TO_EDGE);
gl.glCopyTexImage2D(textureTarget, 0, GL.GL_RGB, 0, 0, drawable.getWidth(), drawable.getHeight(), 0);
}
}
}
return res;
}
public int getFloatingPointMode() {
return drawable.getFloatingPointMode();
}
private static String wglGetLastError() {
return WindowsGLDrawableFactory.wglGetLastError();
}
}
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