OpenGL ESメモ

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コードを書いておく。ただそれだけ。

package info.justoneplanet.android.glsample;

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 javax.microedition.khronos.opengles.GL11;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Bitmap.Config;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.opengl.GLSurfaceView;
import android.opengl.GLU;
import android.opengl.GLUtils;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.SurfaceView;

public class MainActivity extends Activity {
    private GLSurfaceView gLSurfaceView;



    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        gLSurfaceView = new GLSurfaceView(this);
        gLSurfaceView.setRenderer(new Renderer());
        setContentView(gLSurfaceView);
    }
    
    @Override
    public void onPause()
    {
        super.onPause();
        gLSurfaceView.onPause();
    }
    
    @Override
    public void onResume()
    {
        super.onResume();
        gLSurfaceView.onResume();
    }
    
    private class Renderer implements GLSurfaceView.Renderer
    {
        @Override
        public void onDrawFrame(GL10 gl) {
            gl.glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
            gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
            
            // camera
            {
                gl.glMatrixMode(GL10.GL_PROJECTION);
                gl.glLoadIdentity();
                
                GLU.gluPerspective(gl, 45.0f, 1.0f, 0.01f, 100.0f);
                GLU.gluLookAt(gl, 0, 0, 10.0f, 0, 0, 0.0f, 0.0f, 1.0f, 0.0f);
            }
            
            // vertices
            {
                final float one = 1.0f;
                
                final float[] vertices = new float[]{
                         one,   one,   one,
                         one,   one,  -one,
                        -one,   one,   one,
                        -one,   one,  -one,
                         one,  -one,   one,
                         one,  -one,  -one,
                        -one,  -one,   one,
                        -one,  -one,  -one,
                };
                
                FloatBuffer fb = ByteBuffer.allocateDirect(vertices.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();
                
                fb.put(vertices);
                fb.position(0);
                
                gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
                gl.glVertexPointer(3, GL10.GL_FLOAT, 0, fb);
            }
            
            {
                gl.glMatrixMode(GL10.GL_MODELVIEW);
                gl.glRotatef(1.0f, 0, 1, 0);// 回転
            }
            
            {
                final byte[] indices = new byte[]{0, 1, 2, 3, 6, 7, 4, 5, 0, 1};
                ByteBuffer bb = ByteBuffer.allocateDirect(indices.length).order(ByteOrder.nativeOrder());
                bb.put(indices);
                bb.position(0);
                gl.glColor4f(0, 1, 0, 1);
                gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, bb.capacity(), GL10.GL_UNSIGNED_BYTE, bb);
            }
            
            {
                final byte[] indices = new byte[]{1, 5, 3, 7};
                ByteBuffer bb = ByteBuffer.allocateDirect(indices.length).order(ByteOrder.nativeOrder());
                bb.put(indices);
                bb.position(0);
                gl.glColor4f(0, 0, 1, 1);
                gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, bb.capacity(), GL10.GL_UNSIGNED_BYTE, bb);
            }
            
            {
                final byte[] indices = new byte[]{0, 2, 4, 6};
                ByteBuffer bb = ByteBuffer.allocateDirect(indices.length).order(ByteOrder.nativeOrder());
                bb.put(indices);
                bb.position(0);
                gl.glColor4f(1, 0, 0, 1);
                gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, bb.capacity(), GL10.GL_UNSIGNED_BYTE, bb);
            }
         }

        @Override
        public void onSurfaceChanged(GL10 gl, int width, int height) {
            gl.glViewport(0, 0, width, height);
        }

        @Override
        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
       }
    }
}

package info.justoneplanet.android.glsample;

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 javax.microedition.khronos.opengles.GL11;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Bitmap.Config;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.opengl.GLSurfaceView;
import android.opengl.GLU;
import android.opengl.GLUtils;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.SurfaceView;

public class MainActivity extends Activity {
    private GLSurfaceView gLSurfaceView;



    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        gLSurfaceView = new GLSurfaceView(this);
        gLSurfaceView.setRenderer(new Renderer());
        setContentView(gLSurfaceView);
    }
    
    @Override
    public void onPause()
    {
        super.onPause();
        gLSurfaceView.onPause();
    }
    
    @Override
    public void onResume()
    {
        super.onResume();
        gLSurfaceView.onResume();
    }
    
    private class Renderer implements GLSurfaceView.Renderer
    {
        @Override
        public void onDrawFrame(GL10 gl) {
            gl.glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
            gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
            
            // camera
            {
                gl.glMatrixMode(GL10.GL_PROJECTION);
                gl.glLoadIdentity();
                
                GLU.gluPerspective(gl, 45.0f, 1.0f, 0.01f, 100.0f);
                GLU.gluLookAt(gl, 0, 5.0f, 5.0f, 0, 0, 0.0f, 0.0f, 1.0f, 0.0f);
            }
            
            // vertices
            {
                final float one = 1.0f;
                
                final float[] vertices = new float[]{
                         one,   one,   one,
                         one,   one,  -one,
                        -one,   one,   one,
                        -one,   one,  -one,
                         one,  -one,   one,
                         one,  -one,  -one,
                        -one,  -one,   one,
                        -one,  -one,  -one,
                };
                
                FloatBuffer fb = ByteBuffer.allocateDirect(vertices.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();
                
                fb.put(vertices);
                fb.position(0);
                
                gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
                gl.glVertexPointer(3, GL10.GL_FLOAT, 0, fb);
            }
            
            {
                gl.glMatrixMode(GL10.GL_MODELVIEW);
                gl.glRotatef(1.0f, 0, 1, 0);// 回転
            }
            
            {
                final byte[] indices = new byte[]{
                        0, 1, 2,
                        2, 1, 3,
                        2, 3, 6,
                        6, 3, 7,
                        6, 7, 4,
                        4, 7, 5,
                        4, 5, 0,
                        0, 5, 1,
                        1, 5, 3,
                        3, 5, 7,
                        0, 2, 4,
                        4, 2, 6,
                };
                ByteBuffer bb = ByteBuffer.allocateDirect(indices.length).order(ByteOrder.nativeOrder());
                bb.put(indices);
                bb.position(0);
                gl.glColor4f(1, 1, 0, 1);
                gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, bb.capacity(), GL10.GL_UNSIGNED_BYTE, bb);
            }
         }

        @Override
        public void onSurfaceChanged(GL10 gl, int width, int height) {
            gl.glViewport(0, 0, width, height);
        }

        @Override
        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
       }
    }
}

package info.justoneplanet.android.glsample;

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 javax.microedition.khronos.opengles.GL11;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Bitmap.Config;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.opengl.GLSurfaceView;
import android.opengl.GLU;
import android.opengl.GLUtils;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.SurfaceView;

public class MainActivity extends Activity {
    private GLSurfaceView gLSurfaceView;



    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        gLSurfaceView = new GLSurfaceView(this);
        gLSurfaceView.setRenderer(new Renderer());
        setContentView(gLSurfaceView);
    }
    
    @Override
    public void onPause()
    {
        super.onPause();
        gLSurfaceView.onPause();
    }
    
    @Override
    public void onResume()
    {
        super.onResume();
        gLSurfaceView.onResume();
    }
    
    private class Renderer implements GLSurfaceView.Renderer
    {
        private float aspect = 0.0f;
        private int vertices = 0;
        private int indices  = 0;
        private int indicesLength;

        @Override
        public void onDrawFrame(GL10 gl) {
            gl.glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
            gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
            
            // camera
            {
                gl.glMatrixMode(GL10.GL_PROJECTION);
                gl.glLoadIdentity();
                
                GLU.gluPerspective(gl, 45.0f, 1.0f, 0.01f, 100.0f);
                GLU.gluLookAt(gl, 0, 5.0f, 5.0f, 0, 0, 0.0f, 0.0f, 1.0f, 0.0f);
            }
            
            {
                gl.glMatrixMode(GL10.GL_MODELVIEW);
                gl.glRotatef(1.0f, 0, 1, 0);
            }
            
            GL11 gl11 = (GL11) gl;
            gl11.glDrawElements(GL10.GL_TRIANGLES, indicesLength, GL10.GL_UNSIGNED_BYTE, 0);
            
         }

        @Override
        public void onSurfaceChanged(GL10 gl, int width, int height) {
            aspect = (float) width / (float) height;
            gl.glViewport(0, 0, width, height);
            
            GL11 gl11 = (GL11) gl;
            {
                int[] buffer = new int[2];
                gl11.glGenBuffers(2, buffer, 0);
                
                vertices = buffer[0];
                indices = buffer[1];
            }
            
            // vertices
            {
                final float one = 1.0f;
                
                final float[] vertices = new float[]{
                         one,   one,   one,
                         one,   one,  -one,
                        -one,   one,   one,
                        -one,   one,  -one,
                         one,  -one,   one,
                         one,  -one,  -one,
                        -one,  -one,   one,
                        -one,  -one,  -one,
                };
                
                FloatBuffer fb = ByteBuffer.allocateDirect(vertices.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();
                
                fb.put(vertices);
                fb.position(0);
                
                gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
                gl11.glBindBuffer(GL11.GL_ARRAY_BUFFER, this.vertices);
                gl11.glBufferData(GL11.GL_ARRAY_BUFFER, fb.capacity() * 4, fb, GL11.GL_STATIC_DRAW);
                
                gl11.glVertexPointer(3, GL10.GL_FLOAT, 0, 0);
            }
            
            {
                final byte[] indices = new byte[]{
                        0, 1, 2,
                        2, 1, 3,
                        2, 3, 6,
                        6, 3, 7,
                        6, 7, 4,
                        4, 7, 5,
                        4, 5, 0,
                        0, 5, 1,
                        1, 5, 3,
                        3, 5, 7,
                        0, 2, 4,
                        4, 2, 6,
                };
                ByteBuffer bb = ByteBuffer.allocateDirect(indices.length).order(ByteOrder.nativeOrder());
                bb.put(indices);
                indicesLength = bb.capacity();
                bb.position(0);
                
                gl11.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, this.indices);
                gl11.glBufferData(GL11.GL_ELEMENT_ARRAY_BUFFER, bb.capacity(), bb, GL11.GL_STATIC_DRAW);
            }
       }

        @Override
        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        }
    }
}

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