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Java™ Binding for the OpenGL® API
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/**
* Copyright 2013 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.opengl.util.texture;
import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;
import com.jogamp.opengl.GL2ES3;
import com.jogamp.opengl.GL2GL3;
import com.jogamp.opengl.GLException;
/**
* Preserves a [ texture-unit, texture-target ] state.
*
* The states keys are the retrieved active texture-unit and the given texture-target
* for which the following states are being queried:
*
* - texture-object
* - GL.GL_TEXTURE_MAG_FILTER
* - GL.GL_TEXTURE_MIN_FILTER
* - GL.GL_TEXTURE_WRAP_S
* - GL.GL_TEXTURE_WRAP_T
*
*/
public class TextureState {
/**
* Returns the pname to query the textureTarget currently bound to the active texture-unit.
*
* Returns 0 is textureTarget is not supported.
*
*/
public static final int getTextureTargetQueryName(final int textureTarget) {
final int texBindQName;
switch(textureTarget) {
case GL.GL_TEXTURE_2D: texBindQName = GL.GL_TEXTURE_BINDING_2D; break;
case GL.GL_TEXTURE_CUBE_MAP: texBindQName = GL.GL_TEXTURE_BINDING_CUBE_MAP; break;
case GL2ES2.GL_TEXTURE_3D: texBindQName = GL2ES2.GL_TEXTURE_BINDING_3D; break;
case GL2GL3.GL_TEXTURE_1D: texBindQName = GL2GL3.GL_TEXTURE_BINDING_1D; break;
case GL2GL3.GL_TEXTURE_1D_ARRAY: texBindQName = GL2GL3.GL_TEXTURE_BINDING_1D_ARRAY; break;
case GL2ES3.GL_TEXTURE_2D_ARRAY: texBindQName = GL2ES3.GL_TEXTURE_BINDING_2D_ARRAY; break;
case GL2GL3.GL_TEXTURE_RECTANGLE: texBindQName = GL2GL3.GL_TEXTURE_BINDING_RECTANGLE; break;
case GL2GL3.GL_TEXTURE_BUFFER: texBindQName = GL2GL3.GL_TEXTURE_BINDING_BUFFER; break;
case GL2ES2.GL_TEXTURE_2D_MULTISAMPLE: texBindQName = GL2ES2.GL_TEXTURE_BINDING_2D_MULTISAMPLE; break;
case GL2ES2.GL_TEXTURE_2D_MULTISAMPLE_ARRAY: texBindQName = GL2ES2.GL_TEXTURE_BINDING_2D_MULTISAMPLE_ARRAY; break;
default: texBindQName = 0;
}
return texBindQName;
}
private final int target;
/**
*
* 0 - unit
* 1 - texture object
* 2 - GL.GL_TEXTURE_MAG_FILTER
* 3 - GL.GL_TEXTURE_MIN_FILTER
* 4 - GL.GL_TEXTURE_WRAP_S
* 5 - GL.GL_TEXTURE_WRAP_T
*
*/
private final int[] state = new int[] { 0, 0, 0, 0, 0, 0 };
private static final String toHexString(final int i) { return "0x"+Integer.toHexString(i); }
private static final int activeTexture(final GL gl) {
final int[] vi = { 0 };
gl.glGetIntegerv(GL.GL_ACTIVE_TEXTURE, vi, 0);
return vi[0];
}
/**
* Creates a texture state for the retrieved active texture-unit and the given texture-target.
* See {@link TextureState}.
* @param gl current GL context's GL object
* @param textureTarget
* @throws GLException if textureTarget is not supported
*/
public TextureState(final GL gl, final int textureTarget) throws GLException {
this(gl, activeTexture(gl), textureTarget);
}
/**
* Creates a texture state for the given active texture-unit and the given texture-target.
* See {@link TextureState}.
* @param gl current GL context's GL object
* @param textureUnit of range [ {@link GL#GL_TEXTURE0}.. ]
* @param textureTarget
* @throws GLException if textureTarget is not supported
*/
public TextureState(final GL gl, final int textureUnit, final int textureTarget) throws GLException {
target = textureTarget;
state[0] = textureUnit;
final int texBindQName = getTextureTargetQueryName(textureTarget);
if( 0 == texBindQName ) {
throw new GLException("Unsupported textureTarget "+toHexString(textureTarget));
}
gl.glGetIntegerv(texBindQName, state, 1);
gl.glGetTexParameteriv(target, GL.GL_TEXTURE_MAG_FILTER, state, 2);
gl.glGetTexParameteriv(target, GL.GL_TEXTURE_MIN_FILTER, state, 3);
gl.glGetTexParameteriv(target, GL.GL_TEXTURE_WRAP_S, state, 4);
gl.glGetTexParameteriv(target, GL.GL_TEXTURE_WRAP_T, state, 5);
}
/**
* Restores the texture-unit's texture-target state.
*
* First the texture-unit is activated, then all states are restored.
*
* @param gl current GL context's GL object
*/
public final void restore(final GL gl) {
gl.glActiveTexture(state[0]);
gl.glBindTexture(target, state[1]);
gl.glTexParameteri(target, GL.GL_TEXTURE_MAG_FILTER, state[2]);
gl.glTexParameteri(target, GL.GL_TEXTURE_MIN_FILTER, state[3]);
gl.glTexParameteri(target, GL.GL_TEXTURE_WRAP_S, state[4]);
gl.glTexParameteri(target, GL.GL_TEXTURE_WRAP_T, state[5]);
}
/** Returns the texture-unit of this state, key value. Unit is of range [ {@link GL#GL_TEXTURE0}.. ]. */
public final int getUnit() { return state[0]; }
/** Returns the texture-target of this state, key value. */
public final int getTarget() { return target; }
/** Returns the state's texture-object. */
public final int getObject() { return state[1]; }
/** Returns the state's mag-filter param. */
public final int getMagFilter() { return state[2]; }
/** Returns the state's min-filter param. */
public final int getMinFilter() { return state[3]; }
/** Returns the state's wrap-s param. */
public final int getWrapS() { return state[4]; }
/** Returns the state's wrap-t param. */
public final int getWrapT() { return state[5]; }
@Override
public final String toString() {
return "TextureState[unit "+(state[0] - GL.GL_TEXTURE0)+", target "+toHexString(target)+
": obj "+toHexString(state[1])+
", filter[mag "+toHexString(state[2])+", min "+toHexString(state[3])+"], "+
": wrap[s "+toHexString(state[4])+", t "+toHexString(state[5])+"]]";
}
}