Android Open Source - 4est Texture

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License

The source code is released under:
MIT License
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Java Source Code

package com.wordsaretoys.rise.glwrapper;
//from   ww  w .  j a v a  2  s. c om
import java.nio.IntBuffer;

import android.annotation.SuppressLint;
import android.graphics.Bitmap;
import android.opengl.GLES11Ext;
import android.opengl.GLES20;

/**
 * represents a single texture object
 * 
 * @author chris
 *
 */
public class Texture {
  
  // GL id
  int[] id = new int[1];
  
  // GL texture type
  int type;

  /**
   * ctor, creates id-only for surface texture usage
   */
  @SuppressLint("InlinedApi")
  public Texture() {
    GLES20.glGenTextures(1, id, 0);
    type = GLES11Ext.GL_TEXTURE_EXTERNAL_OES;
  }

  /**
   * ctor, creates texture from Android bitmap object
   */
  public Texture(Bitmap bitmap) {
    int width = bitmap.getWidth();
    int height = bitmap.getHeight();
    IntBuffer ib = IntBuffer.allocate(width * height);
    bitmap.copyPixelsToBuffer(ib);
    ib.rewind();

    // allocate a GL texture
    GLES20.glGenTextures(1, id, 0);
    type = GLES20.GL_TEXTURE_2D;
    
    // copy texture data and generate mipmap
    GLES20.glBindTexture(type, id[0]);
    GLES20.glTexImage2D(type, 0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glGenerateMipmap(type);
    GLES20.glBindTexture(type, 0);
  }
  
  /**
   * ctor, creates texture from raw bitmap
   */
  public Texture(int[] bitmap, int width, int height) {
    // allocate a GL texture
    GLES20.glGenTextures(1, id, 0);
    type = GLES20.GL_TEXTURE_2D;
    
    // copy texture data and generate mipmap
    IntBuffer ib = IntBuffer.wrap(bitmap);
    GLES20.glBindTexture(type, id[0]);
    GLES20.glTexImage2D(type, 0, GLES20.GL_RGBA, 
        width, height, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glGenerateMipmap(type);
    GLES20.glBindTexture(type, 0);
  }
  
  /**
   * ctor, creates cube map texture from 6 bitmaps
   */
  public Texture(int[] nx, int[] ny, int[] nz, int[] px, int[]  py, int[] pz, int width, int height) {
    
    GLES20.glGenTextures(1, id, 0);
    type = GLES20.GL_TEXTURE_CUBE_MAP;
    
    GLES20.glBindTexture(type, id[0]);
    
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(nx));

    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(ny));

    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(nz));
    
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_X, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(px));

    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(py));

    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, IntBuffer.wrap(pz));

    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glGenerateMipmap(type);
    GLES20.glBindTexture(type, 0);
  }

  /**
   * ctor, creates cube map texture from 6 bitmaps
   */
  public Texture(Bitmap nx, Bitmap ny, Bitmap nz, Bitmap px, Bitmap py, Bitmap pz) {
    int width = nx.getWidth();
    int height = ny.getHeight();
    IntBuffer ib = IntBuffer.allocate(width * height);

    GLES20.glGenTextures(1, id, 0);
    type = GLES20.GL_TEXTURE_CUBE_MAP;
    
    GLES20.glBindTexture(type, id[0]);
    
    nx.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_X, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();

    ny.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();

    nz.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();
    
    px.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_X, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();

    py.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Y, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();

    pz.copyPixelsToBuffer(ib);
    ib.rewind();
    GLES20.glTexImage2D(GLES20.GL_TEXTURE_CUBE_MAP_POSITIVE_Z, 
        0, GLES20.GL_RGBA, width, height, 0, 
        GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, ib);
    ib.clear();

    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glTexParameteri(type, 
        GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR_MIPMAP_NEAREST);
    GLES20.glGenerateMipmap(type);
    GLES20.glBindTexture(type, 0);
  }
  
  /**
   * bind the texture to a sampler and texture unit
   * 
   * used in conjunction with shader.activate()
   * the sampler parameter is available from the activated shader
   * 
   * @param index texture unit index {0..MAX_TEXTURE_IMAGE_UNITS}
   * @param sampler id of sampler variable from shader
   */
  public void bind(int index, int sampler) {
    GLES20.glUniform1i(sampler, index);
    GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + index);
    GLES20.glBindTexture(type, id[0]);
  }
  
  /**
   * release the GL texture
   */
  public void release() {
    GLES20.glDeleteTextures(1, id, 0);
  }
  
  /**
   * return GL object id
   */
  public int getId() {
    return id[0];
  }

  /**
   * reset a default parameter
   */
  public void set(int param, int value) {
    GLES20.glBindTexture(type, id[0]);
    GLES20.glTexParameteri(type, param, value);
    GLES20.glBindTexture(type, 0);
  }

}
Java Source Code List
