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Java™ Binding for the OpenGL® API (Android)
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/**
 * Copyright 2010 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.graph.curve.opengl;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;

import jogamp.graph.curve.opengl.VBORegion2PMSAAES2;
import jogamp.graph.curve.opengl.VBORegion2PVBAAES2;
import jogamp.graph.curve.opengl.VBORegionSPES2;

import com.jogamp.opengl.util.PMVMatrix;
import com.jogamp.opengl.util.texture.TextureSequence;
import com.jogamp.graph.curve.Region;
import com.jogamp.graph.curve.OutlineShape;

/** A GLRegion is the OGL binding of one or more OutlineShapes
 *  Defined by its vertices and generated triangles. The Region
 *  defines the final shape of the OutlineShape(s), which shall produced a shaded
 *  region on the screen.
 *
 *  Implementations of the GLRegion shall take care of the OGL
 *  binding of the depending on its context, profile.
 *
 * @see Region
 * @see OutlineShape
 */
public abstract class GLRegion extends Region {

    /**
     * Create a GLRegion using the passed render mode
     *
     *  In case {@link Region#VBAA_RENDERING_BIT} is being requested the default texture unit
     * {@link Region#DEFAULT_TWO_PASS_TEXTURE_UNIT} is being used.
     * @param renderModes bit-field of modes, e.g. {@link Region#VARWEIGHT_RENDERING_BIT}, {@link Region#VBAA_RENDERING_BIT}
     * @param colorTexSeq optional {@link TextureSequence} for {@link Region#COLORTEXTURE_RENDERING_BIT} rendering mode.
     */
    public static GLRegion create(int renderModes, final TextureSequence colorTexSeq) {
        if( null != colorTexSeq ) {
            renderModes |= Region.COLORTEXTURE_RENDERING_BIT;
        } else if( Region.hasColorTexture(renderModes) ) {
            throw new IllegalArgumentException("COLORTEXTURE_RENDERING_BIT set but null TextureSequence");
        }
        if( isVBAA(renderModes) ) {
            return new VBORegion2PVBAAES2(renderModes, colorTexSeq, Region.DEFAULT_TWO_PASS_TEXTURE_UNIT);
        } else if( isMSAA(renderModes) ) {
            return new VBORegion2PMSAAES2(renderModes, colorTexSeq, Region.DEFAULT_TWO_PASS_TEXTURE_UNIT);
        } else {
            return new VBORegionSPES2(renderModes, colorTexSeq);
        }
    }

    protected final TextureSequence colorTexSeq;

    protected GLRegion(final int renderModes, final TextureSequence colorTexSeq) {
        super(renderModes);
        this.colorTexSeq = colorTexSeq;
    }

    /**
     * Updates a graph region by updating the ogl related
     * objects for use in rendering if {@link #isShapeDirty()}.
     * Allocates the ogl related data and initializes it the 1st time.

     * 
Called by {@link #draw(GL2ES2, RenderState, int, int, int)}.
     */
    protected abstract void updateImpl(final GL2ES2 gl);

    protected abstract void destroyImpl(final GL2ES2 gl);

    protected abstract void clearImpl(final GL2ES2 gl);

    /**
     * Clears all data, i.e. triangles, vertices etc.
     */
    public void clear(final GL2ES2 gl) {
        clearImpl(gl);
        clearImpl();
    }

    /**
     * Delete and clear the associated OGL objects.
     */
    public final void destroy(final GL2ES2 gl) {
        clear(gl);
        destroyImpl(gl);
    }

    /**
     * Renders the associated OGL objects specifying
     * current width/hight of window for multi pass rendering
     * of the region.
     * 
     * User shall consider {@link RegionRenderer#enable(GL2ES2, boolean) enabling}
     * the renderer beforehand and {@link RegionRenderer#enable(GL2ES2, boolean) disabling}
     * it afterwards when used in conjunction with other renderer.
     * 
     * 
     * Users shall also consider setting the {@link GL#glClearColor(float, float, float, float) clear-color}
     * appropriately:
     * 

     *   If {@link GL#GL_BLEND blending} is enabled, RGB shall be set to text color, otherwise
     *       blending will reduce the alpha seam's contrast and the font will appear thinner.
     *   If {@link GL#GL_BLEND blending} is disabled, RGB shall be set to the actual desired background.
     * 
     * The alpha component shall be set to zero.
     * Note: If {@link GL#GL_BLEND blending} is enabled, the
     * {@link RegionRenderer} might need to be
     * {@link RegionRenderer#create(RenderState, com.jogamp.graph.curve.opengl.RegionRenderer.GLCallback, com.jogamp.graph.curve.opengl.RegionRenderer.GLCallback) created}
     * with the appropriate {@link RegionRenderer.GLCallback callbacks}.
     * 
     * @param matrix current {@link PMVMatrix}.
     * @param renderer the {@link RegionRenderer} to be used
     * @param sampleCount desired multisampling sample count for msaa-rendering.
     *        The actual used scample-count is written back when msaa-rendering is enabled, otherwise the store is untouched.
     * @see RegionRenderer#enable(GL2ES2, boolean)
     */
    public final void draw(final GL2ES2 gl, final RegionRenderer renderer, final int[/*1*/] sampleCount) {
        if( isShapeDirty() ) {
            updateImpl(gl);
        }
        drawImpl(gl, renderer, sampleCount);
        clearDirtyBits(DIRTY_SHAPE|DIRTY_STATE);
    }

    protected abstract void drawImpl(final GL2ES2 gl, final RegionRenderer renderer, final int[/*1*/] sampleCount);
}