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// Copyright (c) 2012 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 "ui/gl/gl_fence.h"
#include "base/compiler_specific.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_context.h"
namespace {
class GLFenceNVFence: public gfx::GLFence {
public:
GLFenceNVFence() {
// What if either of these GL calls fails? TestFenceNV will return true.
// See spec:
// http://www.opengl.org/registry/specs/NV/fence.txt
//
// What should happen if TestFenceNV is called for a name before SetFenceNV
// is called?
// We generate an INVALID_OPERATION error, and return TRUE.
// This follows the semantics for texture object names before
// they are bound, in that they acquire their state upon binding.
// We will arbitrarily return TRUE for consistency.
glGenFencesNV(1, &fence_);
glSetFenceNV(fence_, GL_ALL_COMPLETED_NV);
glFlush();
}
virtual bool HasCompleted() OVERRIDE {
return !!glTestFenceNV(fence_);
}
virtual void ClientWait() OVERRIDE {
glFinishFenceNV(fence_);
}
private:
virtual ~GLFenceNVFence() {
glDeleteFencesNV(1, &fence_);
}
GLuint fence_;
};
class GLFenceARBSync: public gfx::GLFence {
public:
GLFenceARBSync() {
sync_ = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);
glFlush();
}
virtual bool HasCompleted() OVERRIDE {
// Handle the case where FenceSync failed.
if (!sync_)
return true;
// We could potentially use glGetSynciv here, but it doesn't work
// on OSX 10.7 (always says the fence is not signaled yet).
// glClientWaitSync works better, so let's use that instead.
return glClientWaitSync(sync_, 0, 0) != GL_TIMEOUT_EXPIRED;
}
virtual void ClientWait() OVERRIDE {
glClientWaitSync(sync_, GL_SYNC_FLUSH_COMMANDS_BIT, GL_TIMEOUT_IGNORED);
}
private:
virtual ~GLFenceARBSync() {
glDeleteSync(sync_);
}
GLsync sync_;
};
#if !defined(OS_MACOSX)
class EGLFenceSync : public gfx::GLFence {
public:
EGLFenceSync() {
display_ = eglGetCurrentDisplay();
sync_ = eglCreateSyncKHR(display_, EGL_SYNC_FENCE_KHR, NULL);
}
virtual bool HasCompleted() OVERRIDE {
EGLint value = 0;
eglGetSyncAttribKHR(display_, sync_, EGL_SYNC_STATUS_KHR, &value);
DCHECK(value == EGL_SIGNALED_KHR || value == EGL_UNSIGNALED_KHR);
return !value || value == EGL_SIGNALED_KHR;
}
virtual void ClientWait() OVERRIDE {
EGLint flags = EGL_SYNC_FLUSH_COMMANDS_BIT_KHR;
EGLTimeKHR time = EGL_FOREVER_KHR;
eglClientWaitSyncKHR(display_, sync_, flags, time);
}
private:
virtual ~EGLFenceSync() {
eglDestroySyncKHR(display_, sync_);
}
EGLSyncKHR sync_;
EGLDisplay display_;
};
#endif // !OS_MACOSX
} // namespace
namespace gfx {
GLFence::GLFence() {
}
GLFence::~GLFence() {
}
// static
GLFence* GLFence::Create() {
#if !defined(OS_MACOSX)
if (gfx::g_driver_egl.ext.b_EGL_KHR_fence_sync)
return new EGLFenceSync();
#endif
if (gfx::g_driver_gl.ext.b_GL_NV_fence)
return new GLFenceNVFence();
if (gfx::g_driver_gl.ext.b_GL_ARB_sync)
return new GLFenceARBSync();
return NULL;
}
} // namespace gfx
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