Android GlUtil: Add helper functions generateTexture/deleteTexture

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

Index: talk/app/webrtc/java/android/org/webrtc/GlUtil.java
diff --git a/talk/app/webrtc/java/android/org/webrtc/GlUtil.java b/talk/app/webrtc/java/android/org/webrtc/GlUtil.java
index 196384edc9b1a6f0cd0312761e198056054678d3..0574fd3e12f12b5043cc6765468209557da07652 100644
--- a/talk/app/webrtc/java/android/org/webrtc/GlUtil.java
+++ b/talk/app/webrtc/java/android/org/webrtc/GlUtil.java
@@ -58,4 +58,20 @@ public class GlUtil {
     fb.position(0);
     return fb;
   }
+
+  /**
+   * Generate texture with standard parameters.
+   */
+  public static int generateTexture(int target) {
+    final int textureArray[] = new int[1];
+    GLES20.glGenTextures(1, textureArray, 0);
+    final int textureId = textureArray[0];
+    GLES20.glBindTexture(target, textureId);
+    GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
+    GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
+    GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
+    GLES20.glTexParameterf(target, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
+    checkNoGLES2Error("generateTexture");
+    return textureId;
+  }
 }