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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "WebGL2Context.h"

#include "GLContext.h"
#include "WebGLSync.h"
#include "mozilla/StaticPrefs_webgl.h"

namespace mozilla {

// -------------------------------------------------------------------------
// Sync objects

already_AddRefed<WebGLSync> WebGL2Context::FenceSync(GLenum condition,
                                                     GLbitfield flags) {
  const FuncScope funcScope(*this, "fenceSync");
  if (IsContextLost()) return nullptr;

  if (condition != LOCAL_GL_SYNC_GPU_COMMANDS_COMPLETE) {
    ErrorInvalidEnum("condition must be SYNC_GPU_COMMANDS_COMPLETE");
    return nullptr;
  }

  if (flags != 0) {
    ErrorInvalidValue("flags must be 0");
    return nullptr;
  }

  RefPtr<WebGLSync> globj = new WebGLSync(this, condition, flags);

  const auto& availRunnable = EnsureAvailabilityRunnable();
  availRunnable->mSyncs.push_back(globj);

  return globj.forget();
}

bool WebGL2Context::IsSync(const WebGLSync* const sync) {
  const FuncScope funcScope(*this, "isSync");
  return ValidateIsObject(sync);
}

void WebGL2Context::DeleteSync(WebGLSync* sync) {
  const FuncScope funcScope(*this, "deleteSync");
  if (!ValidateDeleteObject(sync)) return;

  sync->RequestDelete();
}

GLenum WebGL2Context::ClientWaitSync(const WebGLSync& sync, GLbitfield flags,
                                     GLuint64 timeout) {
  const FuncScope funcScope(*this, "clientWaitSync");
  if (IsContextLost()) return LOCAL_GL_WAIT_FAILED;

  if (!ValidateObject("sync", sync)) return LOCAL_GL_WAIT_FAILED;

  if (flags != 0 && flags != LOCAL_GL_SYNC_FLUSH_COMMANDS_BIT) {
    ErrorInvalidValue("`flags` must be SYNC_FLUSH_COMMANDS_BIT or 0.");
    return LOCAL_GL_WAIT_FAILED;
  }

  if (timeout > kMaxClientWaitSyncTimeoutNS) {
    ErrorInvalidOperation("`timeout` must not exceed %s nanoseconds.",
                          "MAX_CLIENT_WAIT_TIMEOUT_WEBGL");
    return LOCAL_GL_WAIT_FAILED;
  }

  const bool canBeAvailable =
      (sync.mCanBeAvailable || StaticPrefs::webgl_allow_immediate_queries());
  if (!canBeAvailable) {
    if (timeout) {
      GenerateWarning(
          "Sync object not yet queryable. Please wait for the event"
          " loop.");
    }
    return LOCAL_GL_WAIT_FAILED;
  }

  const auto ret = gl->fClientWaitSync(sync.mGLName, flags, timeout);

  if (ret == LOCAL_GL_CONDITION_SATISFIED || ret == LOCAL_GL_ALREADY_SIGNALED) {
    sync.MarkSignaled();
  }

  return ret;
}

void WebGL2Context::WaitSync(const WebGLSync& sync, GLbitfield flags,
                             GLint64 timeout) {
  const FuncScope funcScope(*this, "waitSync");
  if (IsContextLost()) return;

  if (!ValidateObject("sync", sync)) return;

  if (flags != 0) {
    ErrorInvalidValue("`flags` must be 0.");
    return;
  }

  if (timeout != -1) {
    ErrorInvalidValue("`timeout` must be TIMEOUT_IGNORED.");
    return;
  }

  gl->fWaitSync(sync.mGLName, flags, LOCAL_GL_TIMEOUT_IGNORED);
}

void WebGL2Context::GetSyncParameter(JSContext*, const WebGLSync& sync,
                                     GLenum pname,
                                     JS::MutableHandleValue retval) {
  const FuncScope funcScope(*this, "getSyncParameter");
  retval.setNull();
  if (IsContextLost()) return;

  if (!ValidateObject("sync", sync)) return;

  ////

  const bool canBeAvailable =
      (sync.mCanBeAvailable || StaticPrefs::webgl_allow_immediate_queries());
  if (!canBeAvailable && pname == LOCAL_GL_SYNC_STATUS) {
    retval.set(JS::Int32Value(LOCAL_GL_UNSIGNALED));
    return;
  }

  GLint result = 0;
  switch (pname) {
    case LOCAL_GL_OBJECT_TYPE:
    case LOCAL_GL_SYNC_STATUS:
    case LOCAL_GL_SYNC_CONDITION:
    case LOCAL_GL_SYNC_FLAGS:
      gl->fGetSynciv(sync.mGLName, pname, 1, nullptr, &result);

      if (pname == LOCAL_GL_SYNC_STATUS && result == LOCAL_GL_SIGNALED) {
        sync.MarkSignaled();
      }

      retval.set(JS::Int32Value(result));
      return;

    default:
      ErrorInvalidEnumInfo("pname", pname);
      return;
  }
}

}  // namespace mozilla