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POAndroid - OpenGL ES: how to texture a triangle
 

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  1. POAndroid - OpenGL ES: how to texture a triangle
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    <p>I'm learning OpenGL ES. When I'm using texture for triangle, I meet error. Here is my code:</p> <pre><code>package com.test; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import android.app.Activity; import android.content.res.AssetManager; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.opengl.GLSurfaceView; import android.opengl.GLSurfaceView.Renderer; import android.opengl.GLUtils; import android.os.Bundle; public class TexttureTriangleTest extends Activity{ GLSurfaceView glView; ByteBuffer byteBuffer; FloatBuffer vertices; AssetManager assetManager; public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); assetManager = getAssets(); int VERTEX_SIZE = (2+2)*4; byteBuffer = ByteBuffer.allocateDirect(3*VERTEX_SIZE); byteBuffer.order(ByteOrder.nativeOrder()); vertices = byteBuffer.asFloatBuffer(); vertices.put(new float[] { 0.0f, 0.0f, 1, 0, 0, 1, 319.0f, 0.0f, 0, 1, 0, 1, 160.0f, 479.0f, 0, 0, 1, 1}); vertices.flip(); glView = new GLSurfaceView(this); glView.setRenderer(new Render()); setContentView(glView); } class Render implements Renderer{ @Override public void onDrawFrame(GL10 gl) { try { //I think error in this block of code Bitmap bitmap = BitmapFactory.decodeStream(assetManager.open("bobrgb888.png")); int textureIds[] = new int[1]; gl.glGenTextures(1, textureIds, 0); int textureId = textureIds[0]; gl.glBindTexture(GL10.GL_TEXTURE_2D, textureId); GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST); gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST); gl.glBindTexture(GL10.GL_TEXTURE_2D, 0); bitmap.recycle(); } catch (IOException e) { throw new RuntimeException("couldn't load asset!"); } gl.glViewport(0, 0, glView.getWidth(), glView.getHeight()); gl.glClear(GL10.GL_COLOR_BUFFER_BIT); gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); gl.glOrthof(340, 0, 420, 0, 0, 0); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_COLOR_ARRAY); int VERTEX_SIZE = (2+2)*4; vertices.position(0); gl.glVertexPointer(2, GL10.GL_FLOAT, VERTEX_SIZE, vertices); vertices.position(2); gl.glTexCoordPointer(2, GL10.GL_FLOAT, VERTEX_SIZE, vertices); gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3); } @Override public void onSurfaceChanged(GL10 gl, int width, int height) { // TODO Auto-generated method stub } @Override public void onSurfaceCreated(GL10 gl, EGLConfig config) { // TODO Auto-generated method stub } } } </code></pre> <p>I think I have met error in function <code>onDrawFrame</code> and in block code <code>try-catch</code>. Who can verify it for me and teach me how to correct it, please.</p> <p>thanks :)</p>
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