Moving src/webrtc into src/.

In order to eliminate the WebRTC Subtree mirror in Chromium, 
WebRTC is moving the content of the src/webrtc directory up
to the src/ directory.

NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
TBR=tommi@webrtc.org

Bug: chromium:611808
Change-Id: Iac59c5b51b950f174119565bac87955a7994bc38
Reviewed-on: https://webrtc-review.googlesource.com/1560
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#19845}

sdk/android/api/org/webrtc/GlTextureFrameBuffer.java

@@ -0,0 +1,117 @@
+/*
+ *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+package org.webrtc;
+
+import android.opengl.GLES20;
+
+/**
+ * Helper class for handling OpenGL framebuffer with only color attachment and no depth or stencil
+ * buffer. Intended for simple tasks such as texture copy, texture downscaling, and texture color
+ * conversion.
+ */
+// TODO(magjed): Add unittests for this class.
+public class GlTextureFrameBuffer {
+  private final int frameBufferId;
+  private final int textureId;
+  private final int pixelFormat;
+  private int width;
+  private int height;
+
+  /**
+   * Generate texture and framebuffer resources. An EGLContext must be bound on the current thread
+   * when calling this function. The framebuffer is not complete until setSize() is called.
+   */
+  public GlTextureFrameBuffer(int pixelFormat) {
+    switch (pixelFormat) {
+      case GLES20.GL_LUMINANCE:
+      case GLES20.GL_RGB:
+      case GLES20.GL_RGBA:
+        this.pixelFormat = pixelFormat;
+        break;
+      default:
+        throw new IllegalArgumentException("Invalid pixel format: " + pixelFormat);
+    }
+
+    // Create texture.
+    textureId = GlUtil.generateTexture(GLES20.GL_TEXTURE_2D);
+    this.width = 0;
+    this.height = 0;
+
+    // Create framebuffer object.
+    final int frameBuffers[] = new int[1];
+    GLES20.glGenFramebuffers(1, frameBuffers, 0);
+    frameBufferId = frameBuffers[0];
+  }
+
+  /**
+   * (Re)allocate texture. Will do nothing if the requested size equals the current size. An
+   * EGLContext must be bound on the current thread when calling this function. Must be called at
+   * least once before using the framebuffer. May be called multiple times to change size.
+   */
+  public void setSize(int width, int height) {
+    if (width == 0 || height == 0) {
+      throw new IllegalArgumentException("Invalid size: " + width + "x" + height);
+    }
+    if (width == this.width && height == this.height) {
+      return;
+    }
+    this.width = width;
+    this.height = height;
+
+    // Allocate texture.
+    GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
+    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
+    GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, pixelFormat, width, height, 0, pixelFormat,
+        GLES20.GL_UNSIGNED_BYTE, null);
+    GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
+    GlUtil.checkNoGLES2Error("GlTextureFrameBuffer setSize");
+
+    // Attach the texture to the framebuffer as color attachment.
+    GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, frameBufferId);
+    GLES20.glFramebufferTexture2D(
+        GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, textureId, 0);
+
+    // Check that the framebuffer is in a good state.
+    final int status = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
+    if (status != GLES20.GL_FRAMEBUFFER_COMPLETE) {
+      throw new IllegalStateException("Framebuffer not complete, status: " + status);
+    }
+
+    GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, 0);
+  }
+
+  public int getWidth() {
+    return width;
+  }
+
+  public int getHeight() {
+    return height;
+  }
+
+  public int getFrameBufferId() {
+    return frameBufferId;
+  }
+
+  public int getTextureId() {
+    return textureId;
+  }
+
+  /**
+   * Release texture and framebuffer. An EGLContext must be bound on the current thread when calling
+   * this function. This object should not be used after this call.
+   */
+  public void release() {
+    GLES20.glDeleteTextures(1, new int[] {textureId}, 0);
+    GLES20.glDeleteFramebuffers(1, new int[] {frameBufferId}, 0);
+    width = 0;
+    height = 0;
+  }
+}