Android GlUtil: Add helper functions generateTexture/deleteTexture

talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java

Index: talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
diff --git a/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java b/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
index 1720cd86b9c8b087b9d90a68a77a2c1ebd380779..23da47bce3bc317c9cfc30009f2b5e08e62fbf10 100644
--- a/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
+++ b/talk/app/webrtc/java/android/org/webrtc/VideoRendererGui.java
@@ -98,8 +98,9 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
     // |surface| is synchronized on |this|.
     private GLSurfaceView surface;
     private int id;
-    private int[] yuvTextures = { -1, -1, -1 };
-    private int oesTexture = -1;
+    // TODO(magjed): Delete |yuvTextures| in release(). Must be synchronized with draw().
+    private int[] yuvTextures = { 0, 0, 0 };
+    private int oesTexture = 0;
 
     // Render frame queue - accessed by two threads. renderFrame() call does
     // an offer (writing I420Frame to render) and early-returns (recording
@@ -182,20 +183,9 @@ public class VideoRendererGui implements GLSurfaceView.Renderer {
           Thread.currentThread().getId());
 
       // Generate 3 texture ids for Y/U/V and place them into |yuvTextures|.
-      GLES20.glGenTextures(3, yuvTextures, 0);
       for (int i = 0; i < 3; i++)  {
-        GLES20.glActiveTexture(GLES20.GL_TEXTURE0 + i);
-        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, yuvTextures[i]);
-        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
-            GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
-        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
-            GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
-        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
-            GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
-        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
-            GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+        yuvTextures[i] = GlUtil.generateTexture(GLES20.GL_TEXTURE_2D);
       }
-      GlUtil.checkNoGLES2Error("y/u/v glGenTextures");
     }
 
     private void checkAdjustTextureCoords() {