ui/gl/gl_fence_nv.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/gl/gl_fence_nv.h"
   6
   7 #include "ui/gl/gl_bindings.h"
   8
   9 namespace gfx {
  10
  11 GLFenceNV::GLFenceNV() {
  12   // What if either of these GL calls fails? TestFenceNV will return true.
  13   // See spec:
  14   // http://www.opengl.org/registry/specs/NV/fence.txt
  15   //
  16   // What should happen if TestFenceNV is called for a name before SetFenceNV
  17   // is called?
  18   //     We generate an INVALID_OPERATION error, and return TRUE.
  19   //     This follows the semantics for texture object names before
  20   //     they are bound, in that they acquire their state upon binding.
  21   //     We will arbitrarily return TRUE for consistency.
  22   glGenFencesNV(1, &fence_);
  23   glSetFenceNV(fence_, GL_ALL_COMPLETED_NV);
  24   DCHECK(glIsFenceNV(fence_));
  25   glFlush();
  26 }
  27
  28 bool GLFenceNV::HasCompleted() {
  29   DCHECK(glIsFenceNV(fence_));
  30   return !!glTestFenceNV(fence_);
  31 }
  32
  33 void GLFenceNV::ClientWait() {
  34   DCHECK(glIsFenceNV(fence_));
  35   glFinishFenceNV(fence_);
  36 }
  37
  38 void GLFenceNV::ServerWait() {
  39   DCHECK(glIsFenceNV(fence_));
  40   ClientWait();
  41 }
  42
  43 GLFenceNV::~GLFenceNV() {
  44   DCHECK(glIsFenceNV(fence_));
  45   glDeleteFencesNV(1, &fence_);
  46 }
  47
  48 }  // namespace gfx