remoting/android/java/src/org/chromium/chromoting/TextureHelper.java

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 package org.chromium.chromoting;
   6
   7 import android.graphics.Bitmap;
   8 import android.opengl.GLES20;
   9 import android.opengl.GLUtils;
  10
  11 /**
  12  * Helper class for working with OpenGL textures.
  13  */
  14 public class TextureHelper {
  15     /**
  16      * Create new texture handle.
  17      * @return New texture handle.
  18      */
  19     public static int createTextureHandle() {
  20         int[] textureDataHandle = new int[1];
  21         GLES20.glGenTextures(1, textureDataHandle, 0);
  22         if (textureDataHandle[0] != 0) {
  23             return textureDataHandle[0];
  24         } else {
  25             throw new RuntimeException("Error generating texture handle.");
  26         }
  27     }
  28
  29     /**
  30      * Link desktop texture with a handle.
  31      * @param textureDataHandle the handle to attach texture to
  32      */
  33     public static void linkTexture(int textureDataHandle, Bitmap bitmap) {
  34         // Delete previously attached texture.
  35         GLES20.glDeleteTextures(1, new int[]{textureDataHandle}, 0);
  36
  37         // Bind to the texture in OpenGL.
  38         GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureDataHandle);
  39
  40         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
  41                 GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
  42         GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D,
  43                 GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
  44
  45         // Load the bitmap into the bound texture.
  46         GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
  47     }
  48 }