third_party/WebKit/Source/modules/webgl/WebGLTransformFeedback.cpp

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "modules/webgl/WebGLTransformFeedback.h"

#include "gpu/command_buffer/client/gles2_interface.h"
#include "modules/webgl/WebGL2RenderingContextBase.h"

namespace blink {

WebGLTransformFeedback* WebGLTransformFeedback::create(
    WebGL2RenderingContextBase* ctx) {
  return new WebGLTransformFeedback(ctx);
}

WebGLTransformFeedback::~WebGLTransformFeedback() {
  // See the comment in WebGLObject::detachAndDeleteObject().
  detachAndDeleteObject();
}

WebGLTransformFeedback::WebGLTransformFeedback(WebGL2RenderingContextBase* ctx)
    : WebGLSharedPlatform3DObject(ctx), m_target(0), m_program(nullptr) {
  GLuint tf;
  ctx->contextGL()->GenTransformFeedbacks(1, &tf);
  setObject(tf);
}

void WebGLTransformFeedback::deleteObjectImpl(gpu::gles2::GLES2Interface* gl) {
  gl->DeleteTransformFeedbacks(1, &m_object);
  m_object = 0;
}

void WebGLTransformFeedback::setTarget(GLenum target) {
  if (m_target)
    return;
  if (target == GL_TRANSFORM_FEEDBACK)
    m_target = target;
}

void WebGLTransformFeedback::setProgram(WebGLProgram* program) {
  m_program = program;
}

DEFINE_TRACE(WebGLTransformFeedback) {
  visitor->trace(m_program);
  WebGLSharedPlatform3DObject::trace(visitor);
}

}  // namespace blink