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Android example source code file (Grid.java)
The Grid.java Android example source code/* * Copyright (C) 2007 Google Inc. * * 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.google.android.opengles.spritetext; 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; mVertexArray = new float[size * 3]; mVertexBuffer = FloatBuffer.wrap(mVertexArray); mTexCoordArray = new float[size * 2]; mTexCoordBuffer = FloatBuffer.wrap(mTexCoordArray); int quadW = mW - 1; int quadH = mH - 1; int quadCount = quadW * quadH; int indexCount = quadCount * 6; mIndexCount = indexCount; char[] indexArray = new char[indexCount]; /* * 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); indexArray[i++] = a; indexArray[i++] = b; indexArray[i++] = c; indexArray[i++] = b; indexArray[i++] = c; indexArray[i++] = d; } } } mIndexBuffer = CharBuffer.wrap(indexArray); } 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; mVertexArray[posIndex] = x; mVertexArray[posIndex + 1] = y; mVertexArray[posIndex + 2] = z; int texIndex = index * 2; mTexCoordArray[texIndex] = u; mTexCoordArray[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 float[] mVertexArray; private FloatBuffer mTexCoordBuffer; private float[] mTexCoordArray; private CharBuffer mIndexBuffer; private int mW; private int mH; private int mIndexCount; } Other Android examples (source code examples)Here is a short list of links related to this Android Grid.java source code file: |
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