| #include "precompiled.h" |
| // |
| // Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| // |
| |
| // Fence.cpp: Implements the gl::Fence class, which supports the GL_NV_fence extension. |
| |
| // Important note on accurate timers in Windows: |
| // |
| // QueryPerformanceCounter has a few major issues, including being 10x as expensive to call |
| // as timeGetTime on laptops and "jumping" during certain hardware events. |
| // |
| // See the comments at the top of the Chromium source file "chromium/src/base/time/time_win.cc" |
| // https://code.google.com/p/chromium/codesearch#chromium/src/base/time/time_win.cc |
| // |
| // We still opt to use QPC. In the present and moving forward, most newer systems will not suffer |
| // from buggy implementations. |
| |
| #include "libGLESv2/Fence.h" |
| #include "libGLESv2/renderer/FenceImpl.h" |
| #include "libGLESv2/renderer/Renderer.h" |
| #include "libGLESv2/main.h" |
| |
| namespace gl |
| { |
| |
| FenceNV::FenceNV(rx::Renderer *renderer) |
| { |
| mFence = renderer->createFence(); |
| } |
| |
| FenceNV::~FenceNV() |
| { |
| delete mFence; |
| } |
| |
| GLboolean FenceNV::isFence() const |
| { |
| // GL_NV_fence spec: |
| // A name returned by GenFencesNV, but not yet set via SetFenceNV, is not the name of an existing fence. |
| return (mFence->isSet() ? GL_TRUE : GL_FALSE); |
| } |
| |
| void FenceNV::setFence(GLenum condition) |
| { |
| mFence->set(); |
| |
| mCondition = condition; |
| mStatus = GL_FALSE; |
| } |
| |
| GLboolean FenceNV::testFence() |
| { |
| // Flush the command buffer by default |
| bool result = mFence->test(true); |
| |
| mStatus = (result ? GL_TRUE : GL_FALSE); |
| return mStatus; |
| } |
| |
| void FenceNV::finishFence() |
| { |
| ASSERT(mFence->isSet()); |
| |
| while (!mFence->test(true)) |
| { |
| Sleep(0); |
| } |
| } |
| |
| GLint FenceNV::getFencei(GLenum pname) |
| { |
| ASSERT(mFence->isSet()); |
| |
| switch (pname) |
| { |
| case GL_FENCE_STATUS_NV: |
| { |
| // GL_NV_fence spec: |
| // Once the status of a fence has been finished (via FinishFenceNV) or tested and the returned status is TRUE (via either TestFenceNV |
| // or GetFenceivNV querying the FENCE_STATUS_NV), the status remains TRUE until the next SetFenceNV of the fence. |
| if (mStatus == GL_TRUE) |
| { |
| return GL_TRUE; |
| } |
| |
| mStatus = (mFence->test(false) ? GL_TRUE : GL_FALSE); |
| return mStatus; |
| } |
| |
| case GL_FENCE_CONDITION_NV: |
| return mCondition; |
| |
| default: UNREACHABLE(); return 0; |
| } |
| } |
| |
| FenceSync::FenceSync(rx::Renderer *renderer, GLuint id) |
| : RefCountObject(id) |
| { |
| mFence = renderer->createFence(); |
| |
| LARGE_INTEGER counterFreqency = { 0 }; |
| BOOL success = QueryPerformanceFrequency(&counterFreqency); |
| ASSERT(success); |
| |
| mCounterFrequency = counterFreqency.QuadPart; |
| } |
| |
| FenceSync::~FenceSync() |
| { |
| delete mFence; |
| } |
| |
| void FenceSync::set(GLenum condition) |
| { |
| mCondition = condition; |
| mFence->set(); |
| } |
| |
| GLenum FenceSync::clientWait(GLbitfield flags, GLuint64 timeout) |
| { |
| ASSERT(mFence->isSet()); |
| |
| bool flushCommandBuffer = ((flags & GL_SYNC_FLUSH_COMMANDS_BIT) != 0); |
| |
| if (mFence->test(flushCommandBuffer)) |
| { |
| return GL_ALREADY_SIGNALED; |
| } |
| |
| if (mFence->hasError()) |
| { |
| return GL_WAIT_FAILED; |
| } |
| |
| if (timeout == 0) |
| { |
| return GL_TIMEOUT_EXPIRED; |
| } |
| |
| LARGE_INTEGER currentCounter = { 0 }; |
| BOOL success = QueryPerformanceCounter(¤tCounter); |
| ASSERT(success); |
| |
| LONGLONG timeoutInSeconds = static_cast<LONGLONG>(timeout) * static_cast<LONGLONG>(1000000ll); |
| LONGLONG endCounter = currentCounter.QuadPart + mCounterFrequency * timeoutInSeconds; |
| |
| while (currentCounter.QuadPart < endCounter && !mFence->test(flushCommandBuffer)) |
| { |
| Sleep(0); |
| BOOL success = QueryPerformanceCounter(¤tCounter); |
| ASSERT(success); |
| } |
| |
| if (mFence->hasError()) |
| { |
| return GL_WAIT_FAILED; |
| } |
| |
| if (currentCounter.QuadPart >= endCounter) |
| { |
| return GL_TIMEOUT_EXPIRED; |
| } |
| |
| return GL_CONDITION_SATISFIED; |
| } |
| |
| void FenceSync::serverWait() |
| { |
| // Because our API is currently designed to be called from a single thread, we don't need to do |
| // extra work for a server-side fence. GPU commands issued after the fence is created will always |
| // be processed after the fence is signaled. |
| } |
| |
| GLenum FenceSync::getStatus() const |
| { |
| if (mFence->test(false)) |
| { |
| // The spec does not specify any way to report errors during the status test (e.g. device lost) |
| // so we report the fence is unblocked in case of error or signaled. |
| return GL_SIGNALED; |
| } |
| |
| return GL_UNSIGNALED; |
| } |
| |
| } |