oglstackhandler.java

来自「world wind java sdk 源码」· Java 代码 · 共 116 行

/*
Copyright (C) 2001, 2009 United States Government
as represented by the Administrator of the
National Aeronautics and Space Administration.
All Rights Reserved.
*/
package gov.nasa.worldwind.util;

import javax.media.opengl.GL;

/**
 * @author tag
 * @version $Id: OGLStackHandler.java 9323 2009-03-12 04:53:44Z dcollins $
 */
public class OGLStackHandler
{
    private boolean attribsPushed;
    private boolean clientAttribsPushed;
    private boolean modelviewPushed;
    private boolean projectionPushed;
    private boolean texturePushed;

    public void pushAttrib(GL gl, int mask)
    {
        gl.glPushAttrib(mask);
        this.attribsPushed = true;
    }

    public void pushClientAttrib(GL gl, int mask)
    {
        gl.glPushClientAttrib(mask);
        this.clientAttribsPushed = true;
    }

    public void pushModelview(GL gl)
    {
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glPushMatrix();
        this.modelviewPushed = true;
    }

    public void pushProjection(GL gl)
    {
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glPushMatrix();
        this.projectionPushed = true;
    }

    public void pushTexture(GL gl)
    {
        gl.glMatrixMode(GL.GL_TEXTURE);
        gl.glPushMatrix();
        this.texturePushed = true;
    }

    public void pop(GL gl)
    {
        if (this.attribsPushed)
        {
            gl.glPopAttrib();
            this.attribsPushed = false;
        }

        if (this.clientAttribsPushed)
        {
            gl.glPopClientAttrib();
            this.clientAttribsPushed = false;
        }

        if (this.modelviewPushed)
        {
            gl.glMatrixMode(GL.GL_MODELVIEW);
            gl.glPopMatrix();
            this.modelviewPushed = false;
        }

        if (this.projectionPushed)
        {
            gl.glMatrixMode(GL.GL_PROJECTION);
            gl.glPopMatrix();
            this.projectionPushed = false;
        }

        if (this.texturePushed)
        {
            gl.glMatrixMode(GL.GL_TEXTURE);
            gl.glPopMatrix();
            this.texturePushed = false;
        }
    }

    public void pushModelviewIdentity(GL gl)
    {
        gl.glMatrixMode(GL.GL_MODELVIEW);
        this.modelviewPushed = true;
        gl.glPushMatrix();
        gl.glLoadIdentity();
    }

    public void pushProjectionIdentity(GL gl)
    {
        gl.glMatrixMode(GL.GL_PROJECTION);
        this.projectionPushed = true;
        gl.glPushMatrix();
        gl.glLoadIdentity();
    }

    public void pushTextureIdentity(GL gl)
    {
        gl.glMatrixMode(GL.GL_TEXTURE);
        this.texturePushed = true;
        gl.glPushMatrix();
        gl.glLoadIdentity();
    }
}