xref: /external/replicaisland/src/com/replica/replicaisland/OpenGLSystem.java

/*
 * Copyright (C) 2010 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.replica.replicaisland;

import javax.microedition.khronos.opengles.GL10;
import javax.microedition.khronos.opengles.GL11;
import javax.microedition.khronos.opengles.GL11Ext;

/**
 * An object wrapper for a pointer to the OpenGL context.  Note that the context is only valid
 * in certain threads at certain times (namely, in the Rendering thread during draw time), and at
 * other times getGL() will return null.
 */
public class OpenGLSystem extends BaseObject {

    private static GL10 sGL;
    private static int sLastBoundTexture;
    private static int sLastSetCropSignature;

    public OpenGLSystem() {
        super();
        sGL = null;
    }

    public OpenGLSystem(GL10 gl) {
        sGL = gl;
    }

    public static final void setGL(GL10 gl) {
        sGL = gl;
        sLastBoundTexture = 0;
        sLastSetCropSignature = 0;
    }

    public static final GL10 getGL() {
        return sGL;
    }

    public static final void bindTexture(int target, int texture) {
        if (sLastBoundTexture != texture) {
            sGL.glBindTexture(target, texture);
            sLastBoundTexture = texture;
            sLastSetCropSignature = 0;
        }
    }

    public static final void setTextureCrop(int[] crop) {
        int cropSignature = 0;
        cropSignature = (crop[0] + crop[1]) << 16;
        cropSignature |= crop[2] + crop[3];

        if (cropSignature != sLastSetCropSignature) {
            ((GL11) sGL).glTexParameteriv(GL10.GL_TEXTURE_2D, GL11Ext.GL_TEXTURE_CROP_RECT_OES,
                    crop, 0);
            sLastSetCropSignature = cropSignature;
        }
    }

    @Override
    public void reset() {

    }

}