package com.tid.opengljava;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.opengl.GLUtils;
import android.util.Log;
public class OpenGLUtils {
public static FloatBuffer allocateFloatBuffer(int capacity){
ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
vbb.order(ByteOrder.nativeOrder());
return vbb.asFloatBuffer();
}
public static IntBuffer allocateInttBuffer(int capacity){
ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
vbb.order(ByteOrder.nativeOrder());
return vbb.asIntBuffer();
}
public static ShortBuffer allocateShortBuffer(int capacity){
ByteBuffer vbb = ByteBuffer.allocateDirect(capacity);
vbb.order(ByteOrder.nativeOrder());
return vbb.asShortBuffer();
}
public static void addVertex3f(FloatBuffer buffer,float x,float y,float z){
buffer.put(x);
buffer.put(y);
buffer.put(z);
}
public static void addIndex(ShortBuffer buffer,int index1,int index2,int index3){
buffer.put((short) index1);
buffer.put((short) index2);
buffer.put((short) index3);
}
public static void addCoord2f(FloatBuffer buffer,float x,float y){
buffer.put(x);
buffer.put(y);
}
public static void addColorf(FloatBuffer buffer,float r,float g,float b,float a){
buffer.put(r);
buffer.put(g);
buffer.put(b);
buffer.put(a);
}
public static FloatBuffer toFloatBufferPositionZero(float[] values) {
ByteBuffer vbb = ByteBuffer.allocateDirect(values.length*4);
vbb.order(ByteOrder.nativeOrder());
FloatBuffer buffer=vbb.asFloatBuffer();
buffer.put(values);
buffer.position(0);
return buffer;
}
public static ShortBuffer toShortBuffer(short[] values) {
ByteBuffer vbb = ByteBuffer.allocateDirect(values.length*2);
vbb.order(ByteOrder.nativeOrder());
ShortBuffer buffer=vbb.asShortBuffer();
buffer.put(values);
buffer.position(0);
return buffer;
}
public static Bitmap loadBitmap(Context mContext,int id){
Options opt=new Options();
Bitmap bitmap= BitmapFactory.decodeResource(mContext.getResources(), id,opt);
System.out.println(bitmap.getConfig());
if(!sizeCheck(bitmap)){
throw new RuntimeException("width or height not 2x size,it make invalid error on OpenGL:"+id);
}
return bitmap;
}
private static boolean sizeCheck(Bitmap bitmap){
boolean ret=true;
int t=2;
int w=bitmap.getWidth();
while(w!=t){
if(w%t==1){
Log.e("glutils w=",w+","+t);
return false;
}
t*=2;
if(t>w){
return false;
}
}
t=2;
int h=bitmap.getHeight();
while(h!=t){
if(h%t==1){
Log.e("glutils h=",h+","+t);
return false;
}
t*=2;
if(t>h){
return false;
}
}
return ret;
}
/**
* this is for resized
* GLU.gluOrtho2D (gl,-1f, 1.0f, -1f, 1.0f);
* @param x
* @param y
* @param screenWidth
* @param screenHeight
* @return
*/
public static float[] toOpenGLCordinate(float x,float y,int screenWidth,int screenHeight){
float sx=((float)x/screenWidth)*2-1.0f;
float sy=((float)y/screenHeight)*2-1.0f;
sy*=-1;
return new float[]{sx,sy};
}
/*
* y should *=-1;
*/
public static float toOpenGLCordinate(float x,int screenWidth){
Log.i("myapp","x="+x+","+screenWidth);
float sx=((float)x/screenWidth)*2-1.0f;
return sx;
}
public static float realToVirtialValue(int x,int real,float virtial){
return virtial/real*x;
}
public static int virtualToRealvalue(float x,int real,float virtial){
//using DecimalFormat make gc
return (int) ((float)x/(virtial/real));
}
private static FloatBuffer mTextureBuffer;
private static FloatBuffer mFVertexBuffer;
private static ShortBuffer mIndexBuffer;
public static FloatBuffer getBoxTriangleTextureBuffer(){
if(mTextureBuffer==null){
mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*6*2);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f);
mTextureBuffer.position(0);
}
return mTextureBuffer;
}
public static FloatBuffer getBoxTriangleFlipVerticalTextureBuffer(){
if(mTextureBuffer==null){
mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*6*2);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f);
mTextureBuffer.position(0);
}
return mTextureBuffer;
}
public static FloatBuffer getBoxTextureBuffer(){
if(mTextureBuffer==null){
mTextureBuffer=OpenGLUtils.allocateFloatBuffer(4*4*2);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,0.0f, 1.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 0.0f);
OpenGLUtils.addCoord2f(mTextureBuffer,1.0f, 1.0f);
mTextureBuffer.position(0);
}
return mTextureBuffer;
}
public static ShortBuffer getBoxIndexBuffer(){
if(mIndexBuffer==null){
mIndexBuffer=OpenGLUtils.allocateShortBuffer(6*2);
mIndexBuffer.put((short)0);
mIndexBuffer.put((short)1);
mIndexBuffer.put((short)2);
mIndexBuffer.put((short)2);
mIndexBuffer.put((short)3);
mIndexBuffer.put((short)1);
mIndexBuffer.position(0);
}
return mIndexBuffer;
}
public static FloatBuffer getBoxVertexBuffer(){
if(mFVertexBuffer==null){
mFVertexBuffer=OpenGLUtils.allocateFloatBuffer(4*4*3);
OpenGLUtils.addVertex3f(mFVertexBuffer, -1,-1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, 1,1f,0);
mFVertexBuffer.position(0);
}
return mFVertexBuffer;
}
public static FloatBuffer getBoxTriangleVertexBuffer(){
if(mFVertexBuffer==null){
mFVertexBuffer=OpenGLUtils.allocateFloatBuffer(4*6*3);
OpenGLUtils.addVertex3f(mFVertexBuffer, -1,-1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, 1,-1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, 1,1f,0);
OpenGLUtils.addVertex3f(mFVertexBuffer, -1,1f,0);
mFVertexBuffer.position(0);
}
return mFVertexBuffer;
}
//TODO その他のパラメターをサポート
/*
* bitmapは自動で回収されます。
*/
public static void bindTextureImage(GL10 gl,final int id,final Bitmap bitmap){
gl.glBindTexture(GL10.GL_TEXTURE_2D, id);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_CLAMP_TO_EDGE);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_CLAMP_TO_EDGE);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_NEAREST);
gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST);
GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
bitmap.recycle();
}
}