Android Open Source - Gloomy-Dungeons-3D Grid

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License

The source code is released under:

MIT License

Java Source Code

/*
 * Copyright (C) 2007 The Android Open Source Project
 *//w w w . j  a  v a2s.c  om
 * 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 zame.libs;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.CharBuffer;
import java.nio.FloatBuffer;
import javax.microedition.khronos.opengles.GL10;

/**
 * A 2D rectangular mesh. Can be drawn textured or untextured.
 *
 */
class Grid
{
  public Grid(int w, int h)
  {
    if (w < 0 || w >= 65536) {
      throw new IllegalArgumentException("w");
    }

    if (h < 0 || h >= 65536) {
      throw new IllegalArgumentException("h");
    }

    if (w * h >= 65536) {
      throw new IllegalArgumentException("w * h >= 65536");
    }

    mW = w;
    mH = h;
    int size = w * h;

    final int FLOAT_SIZE = 4;
    final int CHAR_SIZE = 2;

    mVertexBuffer = ByteBuffer.allocateDirect(FLOAT_SIZE * size * 3)
      .order(ByteOrder.nativeOrder())
      .asFloatBuffer();

    mTexCoordBuffer = ByteBuffer.allocateDirect(FLOAT_SIZE * size * 2)
      .order(ByteOrder.nativeOrder())
      .asFloatBuffer();

    int quadW = mW - 1;
    int quadH = mH - 1;
    int quadCount = quadW * quadH;
    int indexCount = quadCount * 6;
    mIndexCount = indexCount;

    mIndexBuffer = ByteBuffer.allocateDirect(CHAR_SIZE * indexCount)
      .order(ByteOrder.nativeOrder())
      .asCharBuffer();

    /*
     * Initialize triangle list mesh.
     *
     * [0]-----[  1] ...
     *  |      /  |
     *  |    /    |
     *  |  /      |
     * [w]-----[w+1] ...
     *  |         |
     *
     */

    {
      int i = 0;

      for (int y = 0; y < quadH; y++)
      {
        for (int x = 0; x < quadW; x++)
        {
          char a = (char) (y * mW + x);
          char b = (char) (y * mW + x + 1);
          char c = (char) ((y + 1) * mW + x);
          char d = (char) ((y + 1) * mW + x + 1);

          mIndexBuffer.put(i++, a);
          mIndexBuffer.put(i++, b);
          mIndexBuffer.put(i++, c);

          mIndexBuffer.put(i++, b);
          mIndexBuffer.put(i++, c);
          mIndexBuffer.put(i++, d);
        }
      }
    }
  }

  void set(int i, int j, float x, float y, float z, float u, float v)
  {
    if (i < 0 || i >= mW) {
      throw new IllegalArgumentException("i");
    }

    if (j < 0 || j >= mH) {
      throw new IllegalArgumentException("j");
    }

    int index = mW * j + i;

    int posIndex = index * 3;
    mVertexBuffer.put(posIndex, x);
    mVertexBuffer.put(posIndex + 1, y);
    mVertexBuffer.put(posIndex + 2, z);

    int texIndex = index * 2;
    mTexCoordBuffer.put(texIndex, u);
    mTexCoordBuffer.put(texIndex + 1, v);
  }

  public void draw(GL10 gl, boolean useTexture)
  {
    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
    gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mVertexBuffer);

    if (useTexture)
    {
      gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
      gl.glTexCoordPointer(2, GL10.GL_FLOAT, 0, mTexCoordBuffer);
      gl.glEnable(GL10.GL_TEXTURE_2D);
    }
    else
    {
      gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
      gl.glDisable(GL10.GL_TEXTURE_2D);
    }

    gl.glDrawElements(GL10.GL_TRIANGLES, mIndexCount, GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
  }

  private FloatBuffer mVertexBuffer;
  private FloatBuffer mTexCoordBuffer;
  private CharBuffer mIndexBuffer;

  private int mW;
  private int mH;
  private int mIndexCount;
}

Java Source Code List

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