OpenGL学习5

程序员文章站 2022-07-05 08:09:57

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OpenGL给正方体的各个面加上纹理（贴图）

注意事项：

*图片如果放在drawable-mdpi目录下，则在模拟器上可以正常显示，但是在真机上不能显示图片，本处新建一个drawable-nodpi目录，将图片资源放在此目录下

1.代码

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

public class OpenGLActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        Bitmap bm1 = BitmapFactory.decodeResource(getResources(), R.drawable.a1);
        Bitmap bm2 = BitmapFactory.decodeResource(getResources(), R.drawable.a2);
        Bitmap bm3 = BitmapFactory.decodeResource(getResources(), R.drawable.a3);
        Bitmap bm4 = BitmapFactory.decodeResource(getResources(), R.drawable.a4);
        Bitmap bm5 = BitmapFactory.decodeResource(getResources(), R.drawable.a5);
        Bitmap bm6 = BitmapFactory.decodeResource(getResources(), R.drawable.a6);
        
        GLSurfaceView glView = new GLSurfaceView(this);
        glView.setRenderer(new GLTextureRender(bm1, bm2, bm3, bm4, bm5, bm6));
        setContentView(glView);
    }
}

package com.lanhuidong.opengl;

import java.nio.ByteBuffer;
import java.nio.IntBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import com.lanhuidong.opengl.util.BufferToNativeOrder;

import android.graphics.Bitmap;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLUtils;

public class GLTextureRender implements Renderer
{
	float xrot, yrot, zrot;
	int texture[];
	
	int one = 0x10000;
	
	int[] vertices = new int[]{
			-one,-one,one,  //前
			one,-one,one,
			one,one,one,
			-one,one,one,
			
			-one,-one,-one,  //后
			-one,one,-one,
			one,one,-one,
			one,-one,-one,
			
			-one,one,-one, //上
			-one,one,one,
			one,one,one,
			one,one,-one,
			
			-one,-one,-one, //下
			one,-one,-one,
			one,-one,one,
			-one,-one,one,


			-one,-one,-one, //左
			-one,-one,one,
			-one,one,one,
			-one,one,-one,

			one,-one,-one, //右
			one,one,-one,
			one,one,one,
			one,-one,one,
						
	};
	int[] texCoords = new int[]{
	    one,one,one,0,0,0,0,one,	
		0,0,0,one,one,one,one,0,
		one,one,one,0,0,0,0,one,
		0,one,one,one,one,0,0,0,
		0,0,0,one,one,one,one,0,
		one,0,0,0,0,one,one,one,
	};
	
	ByteBuffer indices1 = ByteBuffer.wrap(new byte[]{
	        0,1,3,2,  
            0,0,0,0,  
            0,0,0,0,  
            0,0,0,0,  
            0,0,0,0,  
            0,0,0,0,
	});
	ByteBuffer indices2 = ByteBuffer.wrap(new byte[]{
	        0,0,0,0,
	        4,5,7,6,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0
	});
	ByteBuffer indices3 = ByteBuffer.wrap(new byte[]{
	        0,0,0,0,
            0,0,0,0,
            8,9,11,10,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0
	});
	ByteBuffer indices4 = ByteBuffer.wrap(new byte[]{
	        0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            12,13,15,14,
            0,0,0,0,
            0,0,0,0
	});
	ByteBuffer indices5 = ByteBuffer.wrap(new byte[]{
	        0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            16,17,19,18,
            0,0,0,0
	});
	ByteBuffer indices6 = ByteBuffer.wrap(new byte[]{
	        0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0,
            0,0,0,0,
	        20,21,23,22,
	});
	
	private Bitmap bm1;
	private Bitmap bm2;
	private Bitmap bm3;
	private Bitmap bm4;
	private Bitmap bm5;
	private Bitmap bm6;
	
	public GLTextureRender(Bitmap bm1, Bitmap bm2,Bitmap bm3, Bitmap bm4,Bitmap bm5, Bitmap bm6){
	    this.bm1 = bm1;
	    this.bm2 = bm2;
	    this.bm3 = bm3;
	    this.bm4 = bm4;
	    this.bm5 = bm5;
	    this.bm6 = bm6;
	}
	
	@Override
	public void onDrawFrame(GL10 gl)
	{
		gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
		gl.glLoadIdentity();
		
		gl.glTranslatef(0.0f, 0.0f, -5.0f);
		
		gl.glRotatef(xrot, 1.0f, 0.0f, 0.0f);
		gl.glRotatef(yrot, 0.0f, 1.0f, 0.0f);
		gl.glRotatef(zrot, 0.0f, 0.0f, 1.0f);

		
		gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
		gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
		
		gl.glVertexPointer(3, GL10.GL_FIXED, 0, BufferToNativeOrder.getNativeOrderIntBuffer(vertices));
		gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, BufferToNativeOrder.getNativeOrderIntBuffer(texCoords));
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[0]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices1);

		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[1]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices2);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[2]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices3);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[3]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices4);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[4]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices5);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[5]);
		gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, 24,  GL10.GL_UNSIGNED_BYTE, indices6);

	    gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
	    gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
	    
	    xrot+=1f;
	    yrot+=1.2f; 
	    zrot+=0.6f; 
		
	}

	@Override
	public void onSurfaceChanged(GL10 gl, int width, int height)
	{
		float ratio = (float) width / height;
		gl.glViewport(0, 0, width, height);
		gl.glMatrixMode(GL10.GL_PROJECTION);
		gl.glLoadIdentity();
		gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
		gl.glMatrixMode(GL10.GL_MODELVIEW);	
		gl.glLoadIdentity();	
		
	}

	@Override
	public void onSurfaceCreated(GL10 gl, EGLConfig config)
	{
		gl.glClearColor(1, 1, 1, 1);
		
		gl.glEnable(GL10.GL_CULL_FACE);
		gl.glShadeModel(GL10.GL_SMOOTH);
		gl.glEnable(GL10.GL_DEPTH_TEST);
		
		gl.glClearDepthf(1.0f);
		gl.glDepthFunc(GL10.GL_LEQUAL);
		gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
		gl.glEnable(GL10.GL_TEXTURE_2D);
		
		IntBuffer intBuffer = IntBuffer.allocate(6);
		gl.glGenTextures(6, intBuffer);
		texture = intBuffer.array();
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[0]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm1, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[1]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm2, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[2]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm3, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[3]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm4, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[4]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm5, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
		gl.glBindTexture(GL10.GL_TEXTURE_2D, texture[5]);
		GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bm6, 0);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_LINEAR);
		gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR);
		
	}

}

2.效果

OpenGL学习5

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