QueryVk.cpp

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Author : Shahbaz Youssefi
Date : 2019-06-03 10:40:10
Hash : 0bfa5504
Message : Vulkan: Emulate Transform Feedback with vertex shader output In ES 3.0 and 3.1, only non-indexed GL_POINTS, GL_LINES and GL_TRIANGLES is supported for transform feedback. Without tessellation and geometry shaders, we can calculate the exact location where each vertex transform output should be written on the CPU, and have each vertex shader invocation write its data separately to the appropriate location in the buffer. This depends on the vertexPipelineStoresAndAtomics Vulkan feature. Bug: angleproject:3205 Change-Id: I68ccbb80aece597cf20c557a0aee842360fea593 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1645678 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>

src/libANGLE/renderer/vulkan/QueryVk.cpp

//
// Copyright 2016-2018 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.
//
// QueryVk.cpp:
//    Implements the class methods for QueryVk.
//

#include "libANGLE/renderer/vulkan/QueryVk.h"
#include "libANGLE/Context.h"
#include "libANGLE/TransformFeedback.h"
#include "libANGLE/renderer/vulkan/ContextVk.h"
#include "libANGLE/renderer/vulkan/RendererVk.h"
#include "libANGLE/renderer/vulkan/TransformFeedbackVk.h"

#include "common/debug.h"

namespace rx
{

QueryVk::QueryVk(gl::QueryType type)
    : QueryImpl(type),
      mTransformFeedbackPrimitivesDrawn(0),
      mCachedResult(0),
      mCachedResultValid(false)
{}

QueryVk::~QueryVk() = default;

void QueryVk::onDestroy(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);
    if (getType() != gl::QueryType::TransformFeedbackPrimitivesWritten)
    {
        vk::DynamicQueryPool *queryPool = contextVk->getQueryPool(getType());
        queryPool->freeQuery(contextVk, &mQueryHelper);
        queryPool->freeQuery(contextVk, &mQueryHelperTimeElapsedBegin);
    }
}

angle::Result QueryVk::begin(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    mCachedResultValid = false;

    // Transform feedback query is a handled by a CPU-calculated value when emulated.
    if (getType() == gl::QueryType::TransformFeedbackPrimitivesWritten)
    {
        mTransformFeedbackPrimitivesDrawn = 0;
        contextVk->getCommandGraph()->beginTransformFeedbackEmulatedQuery();
        return angle::Result::Continue;
    }

    if (!mQueryHelper.getQueryPool())
    {
        ANGLE_TRY(contextVk->getQueryPool(getType())->allocateQuery(contextVk, &mQueryHelper));
    }

    // Note: TimeElapsed is implemented by using two Timestamp queries and taking the diff.
    if (getType() == gl::QueryType::TimeElapsed)
    {
        if (!mQueryHelperTimeElapsedBegin.getQueryPool())
        {
            ANGLE_TRY(contextVk->getQueryPool(getType())->allocateQuery(
                contextVk, &mQueryHelperTimeElapsedBegin));
        }

        mQueryHelperTimeElapsedBegin.writeTimestamp(contextVk);
    }
    else
    {
        mQueryHelper.beginQuery(contextVk);
    }

    return angle::Result::Continue;
}

angle::Result QueryVk::end(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    if (getType() == gl::QueryType::TransformFeedbackPrimitivesWritten)
    {
        mCachedResult = mTransformFeedbackPrimitivesDrawn;

        // There could be transform feedback in progress, so add the primitives drawn so far from
        // the current transform feedback object.
        gl::TransformFeedback *transformFeedback =
            context->getState().getCurrentTransformFeedback();
        if (transformFeedback)
        {
            mCachedResult += transformFeedback->getPrimitivesDrawn();
        }
        mCachedResultValid = true;
        contextVk->getCommandGraph()->endTransformFeedbackEmulatedQuery();
    }
    else if (getType() == gl::QueryType::TimeElapsed)
    {
        mQueryHelper.writeTimestamp(contextVk);
    }
    else
    {
        mQueryHelper.endQuery(contextVk);
    }

    return angle::Result::Continue;
}

angle::Result QueryVk::queryCounter(const gl::Context *context)
{
    ContextVk *contextVk = vk::GetImpl(context);

    mCachedResultValid = false;

    if (!mQueryHelper.getQueryPool())
    {
        ANGLE_TRY(contextVk->getQueryPool(getType())->allocateQuery(contextVk, &mQueryHelper));
    }

    ASSERT(getType() == gl::QueryType::Timestamp);

    mQueryHelper.writeTimestamp(contextVk);

    return angle::Result::Continue;
}

angle::Result QueryVk::getResult(const gl::Context *context, bool wait)
{
    if (mCachedResultValid)
    {
        return angle::Result::Continue;
    }

    ContextVk *contextVk = vk::GetImpl(context);
    RendererVk *renderer = contextVk->getRenderer();

    // glGetQueryObject* requires an implicit flush of the command buffers to guarantee execution in
    // finite time.
    // Note regarding time-elapsed: end should have been called after begin, so flushing when end
    // has pending work should flush begin too.
    if (mQueryHelper.hasPendingWork(contextVk))
    {
        ANGLE_TRY(contextVk->flushImpl(nullptr));

        ASSERT(!mQueryHelperTimeElapsedBegin.hasPendingWork(contextVk));
        ASSERT(!mQueryHelper.hasPendingWork(contextVk));
    }

    // If the command buffer this query is being written to is still in flight, its reset command
    // may not have been performed by the GPU yet.  To avoid a race condition in this case, wait
    // for the batch to finish first before querying (or return not-ready if not waiting).
    ANGLE_TRY(contextVk->checkCompletedCommands());
    if (contextVk->isSerialInUse(mQueryHelper.getStoredQueueSerial()))
    {
        if (!wait)
        {
            return angle::Result::Continue;
        }
        ANGLE_TRY(contextVk->finishToSerial(mQueryHelper.getStoredQueueSerial()));
    }

    VkQueryResultFlags flags = (wait ? VK_QUERY_RESULT_WAIT_BIT : 0) | VK_QUERY_RESULT_64_BIT;

    VkResult result = mQueryHelper.getQueryPool()->getResults(
        contextVk->getDevice(), mQueryHelper.getQuery(), 1, sizeof(mCachedResult), &mCachedResult,
        sizeof(mCachedResult), flags);
    // If the results are not ready, do nothing.  mCachedResultValid remains false.
    if (result == VK_NOT_READY)
    {
        // If VK_QUERY_RESULT_WAIT_BIT was given, VK_NOT_READY cannot have been returned.
        ASSERT(!wait);
        return angle::Result::Continue;
    }
    ANGLE_VK_TRY(contextVk, result);

    double timestampPeriod = renderer->getPhysicalDeviceProperties().limits.timestampPeriod;

    // Fix up the results to what OpenGL expects.
    switch (getType())
    {
        case gl::QueryType::AnySamples:
        case gl::QueryType::AnySamplesConservative:
            // OpenGL query result in these cases is binary
            mCachedResult = !!mCachedResult;
            break;
        case gl::QueryType::Timestamp:
            mCachedResult = static_cast<uint64_t>(mCachedResult * timestampPeriod);
            break;
        case gl::QueryType::TimeElapsed:
        {
            uint64_t timeElapsedEnd = mCachedResult;

            result = mQueryHelperTimeElapsedBegin.getQueryPool()->getResults(
                contextVk->getDevice(), mQueryHelperTimeElapsedBegin.getQuery(), 1,
                sizeof(mCachedResult), &mCachedResult, sizeof(mCachedResult), flags);
            // Since the result of the end query of time-elapsed is already available, the
            // result of begin query must be available too.
            ASSERT(result != VK_NOT_READY);
            ANGLE_VK_TRY(contextVk, result);

            mCachedResult = timeElapsedEnd - mCachedResult;
            mCachedResult = static_cast<uint64_t>(mCachedResult * timestampPeriod);

            break;
        }
        default:
            UNREACHABLE();
            break;
    }

    mCachedResultValid = true;
    return angle::Result::Continue;
}
angle::Result QueryVk::getResult(const gl::Context *context, GLint *params)
{
    ANGLE_TRY(getResult(context, true));
    *params = static_cast<GLint>(mCachedResult);
    return angle::Result::Continue;
}

angle::Result QueryVk::getResult(const gl::Context *context, GLuint *params)
{
    ANGLE_TRY(getResult(context, true));
    *params = static_cast<GLuint>(mCachedResult);
    return angle::Result::Continue;
}

angle::Result QueryVk::getResult(const gl::Context *context, GLint64 *params)
{
    ANGLE_TRY(getResult(context, true));
    *params = static_cast<GLint64>(mCachedResult);
    return angle::Result::Continue;
}

angle::Result QueryVk::getResult(const gl::Context *context, GLuint64 *params)
{
    ANGLE_TRY(getResult(context, true));
    *params = mCachedResult;
    return angle::Result::Continue;
}

angle::Result QueryVk::isResultAvailable(const gl::Context *context, bool *available)
{
    ANGLE_TRY(getResult(context, false));
    *available = mCachedResultValid;

    return angle::Result::Continue;
}

void QueryVk::onTransformFeedbackEnd(const gl::Context *context)
{
    gl::TransformFeedback *transformFeedback = context->getState().getCurrentTransformFeedback();
    ASSERT(transformFeedback);

    mTransformFeedbackPrimitivesDrawn += transformFeedback->getPrimitivesDrawn();
}

}  // namespace rx

kc3-lang/angle/src/libANGLE/renderer/vulkan/QueryVk.cpp

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kc3-lang/angle /src/libANGLE/renderer/vulkan/QueryVk.cpp