/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebGLExtensions.h"

#include <algorithm>
#include "GLContext.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "WebGLContext.h"
#include "WebGLFramebuffer.h"
#include "WebGLRenderbuffer.h"
#include "WebGLTexture.h"

namespace mozilla {

WebGLExtensionDrawBuffers::WebGLExtensionDrawBuffers(WebGLContext* webgl)
    : WebGLExtensionBase(webgl) {
  MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");

  webgl->UpdateMaxDrawBuffers();
}

WebGLExtensionDrawBuffers::~WebGLExtensionDrawBuffers() {}

void WebGLExtensionDrawBuffers::DrawBuffersWEBGL(
    const dom::Sequence<GLenum>& buffers) {
  if (mIsLost) {
    if (mContext) {
      mContext->ErrorInvalidOperation("drawBuffersWEBGL: Extension is lost.");
    }
    return;
  }

  mContext->DrawBuffers(buffers);
}

bool WebGLExtensionDrawBuffers::IsSupported(const WebGLContext* webgl) {
  if (webgl->IsWebGL2()) return false;

  gl::GLContext* gl = webgl->GL();
  if (gl->IsGLES() && gl->Version() >= 300) {
    // ANGLE's shader translator can't translate ESSL1 exts to ESSL3. (bug
    // 1524804)
    return false;
  }
  return gl->IsSupported(gl::GLFeature::draw_buffers);
}

IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionDrawBuffers, WEBGL_draw_buffers)

}  // namespace mozilla