make Texture - Android android.graphics

Android examples for android.graphics:Canvas

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  3. android.graphics
  4. Canvas

Description

make Texture

Demo Code

import static android.opengl.GLES20.GL_NEAREST;
import static android.opengl.GLES20.GL_RGBA;
import static android.opengl.GLES20.GL_TEXTURE_2D;
import static android.opengl.GLES20.GL_TEXTURE_MAG_FILTER;
import static android.opengl.GLES20.GL_TEXTURE_MIN_FILTER;
import static android.opengl.GLES20.GL_UNSIGNED_BYTE;
import static android.opengl.GLES20.glBindTexture;
import static android.opengl.GLES20.glGenTextures;
import static android.opengl.GLES20.glTexImage2D;
import static android.opengl.GLES20.glTexParameteri;

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

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

public class Main {

  public static int makeTexture(int x, int y, int color) {
    int[] tid = new int[1];
    ByteBuffer bb = ByteBuffer.allocateDirect(x * y * 4);
    IntBuffer ib = bb.asIntBuffer();

    // int color = 0x0000ffff;
    for (int i = 0; i < x * y; i++) {
      ib.put(color);/* w w  w. j  ava 2 s  .c o  m*/
    }

    // Create and bind a single texture object.
    glGenTextures(1, tid, 0);
    glBindTexture(GL_TEXTURE_2D, tid[0]);

    // Copy the texture to the GPU
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, bb);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    // Unbind texture
    glBindTexture(GL_TEXTURE_2D, 0);

    return tid[0];
  }

  public static int makeTexture(Bitmap bitmap, int w, int h) {
    int textureId = makeTexture(w, h, 0xffffffff);
    if (bitmap != null) {
      Bitmap flippedbmp = flipBitmap(bitmap);
      glBindTexture(GL_TEXTURE_2D, textureId);
      GLUtils.texSubImage2D(GL_TEXTURE_2D, 0, 0, 0, flippedbmp);
      glBindTexture(GL_TEXTURE_2D, 0);
    }
    return textureId;
  }

  /**
   * Flips the pixels in a Bitmap to be mirrored vertically. This is needed for
   * OpenGL to draw the texture properly as loads texture bottom up.
   * 
   * @return a new Bitmap that is identical to the argument but flipped.
   * @param bitmap
   *          The Bitmap to flip the pixels of
   */
  static public Bitmap flipBitmap(Bitmap bitmap) {
    int w = bitmap.getWidth();
    int h = bitmap.getHeight();
    int[] pixels = new int[w * h];
    bitmap.getPixels(pixels, 0, w, 0, 0, w, h);
    for (int y = 0; y < h; y++) {
      for (int x = 0; x < w; x++) {
        pixels[y * w + x] = bitmap.getPixel(x, h - 1 - y);
      }
    }
    bitmap = Bitmap.createBitmap(pixels, w, h, Bitmap.Config.ARGB_8888);
    return bitmap;
  }

}

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