qrhi.cpp 20.9 KB
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/****************************************************************************
**
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the Qt RHI module
**
** $QT_BEGIN_LICENSE:LGPL3$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPLv3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or later as published by the Free
** Software Foundation and appearing in the file LICENSE.GPL included in
** the packaging of this file. Please review the following information to
** ensure the GNU General Public License version 2.0 requirements will be
** met: http://www.gnu.org/licenses/gpl-2.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qrhi_p.h"
#include <qmath.h>

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#ifndef QT_NO_OPENGL
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#include "qrhigles2_p.h"
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#endif
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#if QT_CONFIG(vulkan)
#include "qrhivulkan_p.h"
#endif
#ifdef Q_OS_WIN
#include "qrhid3d11_p.h"
#endif
#ifdef Q_OS_DARWIN
#include "qrhimetal_p.h"
#endif

QT_BEGIN_NAMESPACE

QRhiResource::QRhiResource(QRhiImplementation *rhi_)
    : rhi(rhi_)
{
}

QRhiResource::~QRhiResource()
{
}

void QRhiResource::releaseAndDestroy()
{
    release();
    delete this;
}

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QByteArray QRhiResource::name() const
{
    return objectName;
}

void QRhiResource::setName(const QByteArray &name)
{
    objectName = name;
}

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QRhiBuffer::QRhiBuffer(QRhiImplementation *rhi, Type type_, UsageFlags usage_, int size_)
    : QRhiResource(rhi),
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      m_type(type_), m_usage(usage_), m_size(size_)
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{
}

QRhiRenderBuffer::QRhiRenderBuffer(QRhiImplementation *rhi, Type type_, const QSize &pixelSize_,
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                                   int sampleCount_, Flags flags_)
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    : QRhiResource(rhi),
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      m_type(type_), m_pixelSize(pixelSize_), m_sampleCount(sampleCount_), m_flags(flags_)
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{
}

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QRhiTexture::QRhiTexture(QRhiImplementation *rhi, Format format_, const QSize &pixelSize_,
                         int sampleCount_, Flags flags_)
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    : QRhiResource(rhi),
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      m_format(format_), m_pixelSize(pixelSize_), m_sampleCount(sampleCount_), m_flags(flags_)
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{
}

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const QRhiNativeHandles *QRhiTexture::nativeHandles()
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{
    return nullptr;
}

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bool QRhiTexture::buildFrom(const QRhiNativeHandles *src)
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{
    Q_UNUSED(src);
    return false;
}

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QRhiSampler::QRhiSampler(QRhiImplementation *rhi,
                         Filter magFilter_, Filter minFilter_, Filter mipmapMode_,
                         AddressMode u_, AddressMode v_, AddressMode w_)
    : QRhiResource(rhi),
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      m_magFilter(magFilter_), m_minFilter(minFilter_), m_mipmapMode(mipmapMode_),
      m_addressU(u_), m_addressV(v_), m_addressW(w_)
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{
}

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QRhiRenderPassDescriptor::QRhiRenderPassDescriptor(QRhiImplementation *rhi)
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    : QRhiResource(rhi)
{
}

QRhiRenderTarget::QRhiRenderTarget(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

QRhiReferenceRenderTarget::QRhiReferenceRenderTarget(QRhiImplementation *rhi)
    : QRhiRenderTarget(rhi)
{
}

QRhiTextureRenderTarget::QRhiTextureRenderTarget(QRhiImplementation *rhi,
                                                 const QRhiTextureRenderTargetDescription &desc_,
                                                 Flags flags_)
    : QRhiRenderTarget(rhi),
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      m_desc(desc_),
      m_flags(flags_)
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{
}

QRhiShaderResourceBindings::QRhiShaderResourceBindings(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

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QRhiShaderResourceBinding QRhiShaderResourceBinding::uniformBuffer(
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        int binding_, StageFlags stage_, QRhiBuffer *buf_)
{
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    QRhiShaderResourceBinding b;
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    b.binding = binding_;
    b.stage = stage_;
    b.type = UniformBuffer;
    b.ubuf.buf = buf_;
    b.ubuf.offset = 0;
    b.ubuf.maybeSize = 0; // entire buffer
    return b;
}

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QRhiShaderResourceBinding QRhiShaderResourceBinding::uniformBuffer(
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        int binding_, StageFlags stage_, QRhiBuffer *buf_, int offset_, int size_)
{
    Q_ASSERT(size_ > 0);
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    QRhiShaderResourceBinding b;
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    b.binding = binding_;
    b.stage = stage_;
    b.type = UniformBuffer;
    b.ubuf.buf = buf_;
    b.ubuf.offset = offset_;
    b.ubuf.maybeSize = size_;
    return b;
}

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QRhiShaderResourceBinding QRhiShaderResourceBinding::sampledTexture(
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        int binding_, StageFlags stage_, QRhiTexture *tex_, QRhiSampler *sampler_)
{
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    QRhiShaderResourceBinding b;
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    b.binding = binding_;
    b.stage = stage_;
    b.type = SampledTexture;
    b.stex.tex = tex_;
    b.stex.sampler = sampler_;
    return b;
}

QRhiGraphicsPipeline::QRhiGraphicsPipeline(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

QRhiSwapChain::QRhiSwapChain(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

QRhiCommandBuffer::QRhiCommandBuffer(QRhiImplementation *rhi)
    : QRhiResource(rhi)
{
}

QRhiImplementation::~QRhiImplementation()
{
    qDeleteAll(resUpdPool);
}

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void QRhiImplementation::sendVMemStatsToProfiler()
{
    // nothing to do in the default implementation
}

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bool QRhiImplementation::isCompressedFormat(QRhiTexture::Format format) const
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{
    return (format >= QRhiTexture::BC1 && format <= QRhiTexture::BC7)
            || (format >= QRhiTexture::ETC2_RGB8 && format <= QRhiTexture::ETC2_RGBA8)
            || (format >= QRhiTexture::ASTC_4x4 && format <= QRhiTexture::ASTC_12x12);
}

void QRhiImplementation::compressedFormatInfo(QRhiTexture::Format format, const QSize &size,
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                                              quint32 *bpl, quint32 *byteSize,
                                              QSize *blockDim) const
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{
    int xdim = 4;
    int ydim = 4;
    quint32 blockSize = 0;

    switch (format) {
    case QRhiTexture::BC1:
        blockSize = 8;
        break;
    case QRhiTexture::BC2:
        blockSize = 16;
        break;
    case QRhiTexture::BC3:
        blockSize = 16;
        break;
    case QRhiTexture::BC4:
        blockSize = 8;
        break;
    case QRhiTexture::BC5:
        blockSize = 16;
        break;
    case QRhiTexture::BC6H:
        blockSize = 16;
        break;
    case QRhiTexture::BC7:
        blockSize = 16;
        break;

    case QRhiTexture::ETC2_RGB8:
        blockSize = 8;
        break;
    case QRhiTexture::ETC2_RGB8A1:
        blockSize = 8;
        break;
    case QRhiTexture::ETC2_RGBA8:
        blockSize = 16;
        break;

    case QRhiTexture::ASTC_4x4:
        blockSize = 16;
        break;
    case QRhiTexture::ASTC_5x4:
        blockSize = 16;
        xdim = 5;
        break;
    case QRhiTexture::ASTC_5x5:
        blockSize = 16;
        xdim = ydim = 5;
        break;
    case QRhiTexture::ASTC_6x5:
        blockSize = 16;
        xdim = 6;
        ydim = 5;
        break;
    case QRhiTexture::ASTC_6x6:
        blockSize = 16;
        xdim = ydim = 6;
        break;
    case QRhiTexture::ASTC_8x5:
        blockSize = 16;
        xdim = 8;
        ydim = 5;
        break;
    case QRhiTexture::ASTC_8x6:
        blockSize = 16;
        xdim = 8;
        ydim = 6;
        break;
    case QRhiTexture::ASTC_8x8:
        blockSize = 16;
        xdim = ydim = 8;
        break;
    case QRhiTexture::ASTC_10x5:
        blockSize = 16;
        xdim = 10;
        ydim = 5;
        break;
    case QRhiTexture::ASTC_10x6:
        blockSize = 16;
        xdim = 10;
        ydim = 6;
        break;
    case QRhiTexture::ASTC_10x8:
        blockSize = 16;
        xdim = 10;
        ydim = 8;
        break;
    case QRhiTexture::ASTC_10x10:
        blockSize = 16;
        xdim = ydim = 10;
        break;
    case QRhiTexture::ASTC_12x10:
        blockSize = 16;
        xdim = 12;
        ydim = 10;
        break;
    case QRhiTexture::ASTC_12x12:
        blockSize = 16;
        xdim = ydim = 12;
        break;

    default:
        Q_UNREACHABLE();
        break;
    }

    const quint32 wblocks = (size.width() + xdim - 1) / xdim;
    const quint32 hblocks = (size.height() + ydim - 1) / ydim;

    if (bpl)
        *bpl = wblocks * blockSize;
    if (byteSize)
        *byteSize = wblocks * hblocks * blockSize;
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    if (blockDim)
        *blockDim = QSize(xdim, ydim);
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}

void QRhiImplementation::textureFormatInfo(QRhiTexture::Format format, const QSize &size,
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                                           quint32 *bpl, quint32 *byteSize) const
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{
    if (isCompressedFormat(format)) {
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        compressedFormatInfo(format, size, bpl, byteSize, nullptr);
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        return;
    }

    quint32 bpc = 0;
    switch (format) {
    case QRhiTexture::RGBA8:
        bpc = 4;
        break;
    case QRhiTexture::BGRA8:
        bpc = 4;
        break;
    case QRhiTexture::R8:
        bpc = 1;
        break;
    case QRhiTexture::R16:
        bpc = 2;
        break;

    case QRhiTexture::D16:
        bpc = 2;
        break;
    case QRhiTexture::D32:
        bpc = 4;
        break;

    default:
        Q_UNREACHABLE();
        break;
    }

    if (bpl)
        *bpl = size.width() * bpc;
    if (byteSize)
        *byteSize = size.width() * size.height() * bpc;
}

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// Approximate because it excludes subresource alignment or multisampling.
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quint32 QRhiImplementation::approxByteSizeForTexture(QRhiTexture::Format format, const QSize &baseSize,
                                                     int mipCount, int layerCount)
{
    quint32 approxSize = 0;
    for (int level = 0; level < mipCount; ++level) {
        quint32 byteSize = 0;
        const QSize size(qFloor(float(qMax(1, baseSize.width() >> level))),
                         qFloor(float(qMax(1, baseSize.height() >> level))));
        textureFormatInfo(format, size, nullptr, &byteSize);
        approxSize += byteSize;
    }
    approxSize *= layerCount;
    return approxSize;
}

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QRhi::QRhi()
{
}

QRhi::~QRhi()
{
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    if (d) {
        d->destroy();
        delete d;
    }
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}

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QRhi *QRhi::create(Implementation impl, QRhiInitParams *params, Flags flags)
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{
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    QScopedPointer<QRhi> r(new QRhi);

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    switch (impl) {
    case Vulkan:
#if QT_CONFIG(vulkan)
        r->d = new QRhiVulkan(params);
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        break;
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#else
        qWarning("This build of Qt has no Vulkan support");
        break;
#endif
    case OpenGLES2:
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#ifndef QT_NO_OPENGL
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        r->d = new QRhiGles2(params);
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        break;
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#else
        qWarning("This build of Qt has no OpenGL support");
        break;
#endif
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    case D3D11:
#ifdef Q_OS_WIN
        r->d = new QRhiD3D11(params);
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        break;
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#else
        qWarning("This platform has no Direct3D 11 support");
        break;
#endif
    case Metal:
#ifdef Q_OS_DARWIN
        r->d = new QRhiMetal(params);
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        break;
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#else
        qWarning("This platform has no Metal support");
        break;
#endif
    default:
        break;
    }
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    if (r->d) {
        if (flags.testFlag(EnableProfiling)) {
            QRhiProfilerPrivate *profD = QRhiProfilerPrivate::get(&r->d->profiler);
            profD->rhi = r.data();
            profD->rhiD = r->d;
        }
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        r->d->debugMarkers = flags.testFlag(EnableDebugMarkers);
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        if (r->d->create(flags))
            return r.take();
    }
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    return nullptr;
}

QRhiResourceUpdateBatch::QRhiResourceUpdateBatch(QRhiImplementation *rhi)
    : d(new QRhiResourceUpdateBatchPrivate)
{
    d->q = this;
    d->rhi = rhi;
}

QRhiResourceUpdateBatch::~QRhiResourceUpdateBatch()
{
    delete d;
}

void QRhiResourceUpdateBatch::release()
{
    d->free();
}

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void QRhiResourceUpdateBatch::merge(QRhiResourceUpdateBatch *other)
{
    d->merge(other->d);
}

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void QRhiResourceUpdateBatch::updateDynamicBuffer(QRhiBuffer *buf, int offset, int size, const void *data)
{
    d->dynamicBufferUpdates.append({ buf, offset, size, data });
}

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void QRhiResourceUpdateBatch::uploadStaticBuffer(QRhiBuffer *buf, int offset, int size, const void *data)
{
    d->staticBufferUploads.append({ buf, offset, size, data });
}

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void QRhiResourceUpdateBatch::uploadStaticBuffer(QRhiBuffer *buf, const void *data)
{
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    d->staticBufferUploads.append({ buf, 0, 0, data });
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}

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void QRhiResourceUpdateBatch::uploadTexture(QRhiTexture *tex, const QRhiTextureUploadDescription &desc)
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{
    d->textureUploads.append({ tex, desc });
}

void QRhiResourceUpdateBatch::uploadTexture(QRhiTexture *tex, const QImage &image)
{
    uploadTexture(tex, {{{{{ image }}}}});
}

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void QRhiResourceUpdateBatch::copyTexture(QRhiTexture *dst, QRhiTexture *src, const QRhiTextureCopyDescription &desc)
{
    d->textureCopies.append({ dst, src, desc });
}

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void QRhiResourceUpdateBatch::readBackTexture(const QRhiReadbackDescription &rb, QRhiReadbackResult *result)
{
    d->textureReadbacks.append({ rb, result });
}

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void QRhiResourceUpdateBatch::generateMips(QRhiTexture *tex)
{
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    d->textureMipGens.append(QRhiResourceUpdateBatchPrivate::TextureMipGen(tex));
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}

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void QRhiResourceUpdateBatch::prepareTextureForUse(QRhiTexture *tex, TexturePrepareFlags flags)
{
    d->texturePrepares.append({ tex, flags });
}

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QRhiResourceUpdateBatch *QRhi::nextResourceUpdateBatch()
{
    auto nextFreeBatch = [this]() -> QRhiResourceUpdateBatch * {
        for (int i = 0, ie = d->resUpdPoolMap.count(); i != ie; ++i) {
            if (!d->resUpdPoolMap.testBit(i)) {
                d->resUpdPoolMap.setBit(i);
                QRhiResourceUpdateBatch *u = d->resUpdPool[i];
                QRhiResourceUpdateBatchPrivate::get(u)->poolIndex = i;
                return u;
            }
        }
        return nullptr;
    };

    QRhiResourceUpdateBatch *u = nextFreeBatch();
    if (!u) {
        const int oldSize = d->resUpdPool.count();
        const int newSize = oldSize + 4;
        d->resUpdPool.resize(newSize);
        d->resUpdPoolMap.resize(newSize);
        for (int i = oldSize; i < newSize; ++i)
            d->resUpdPool[i] = new QRhiResourceUpdateBatch(d);
        u = nextFreeBatch();
        Q_ASSERT(u);
    }

    return u;
}

void QRhiResourceUpdateBatchPrivate::free()
{
    Q_ASSERT(poolIndex >= 0 && rhi->resUpdPool[poolIndex] == q);

    dynamicBufferUpdates.clear();
    staticBufferUploads.clear();
    textureUploads.clear();
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    textureCopies.clear();
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    textureReadbacks.clear();
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    textureMipGens.clear();
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    texturePrepares.clear();
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    rhi->resUpdPoolMap.clearBit(poolIndex);
    poolIndex = -1;
}

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void QRhiResourceUpdateBatchPrivate::merge(QRhiResourceUpdateBatchPrivate *other)
{
    dynamicBufferUpdates += other->dynamicBufferUpdates;
    staticBufferUploads += other->staticBufferUploads;
    textureUploads += other->textureUploads;
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    textureCopies += other->textureCopies;
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    textureReadbacks += other->textureReadbacks;
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    textureMipGens += other->textureMipGens;
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    texturePrepares += other->texturePrepares;
}

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void QRhiCommandBuffer::resourceUpdate(QRhiResourceUpdateBatch *resourceUpdates)
{
    rhi->resourceUpdate(this, resourceUpdates);
}

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void QRhiCommandBuffer::beginPass(QRhiRenderTarget *rt,
                                  const QRhiColorClearValue &colorClearValue,
                                  const QRhiDepthStencilClearValue &depthStencilClearValue,
                                  QRhiResourceUpdateBatch *resourceUpdates)
{
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    rhi->beginPass(this, rt, colorClearValue, depthStencilClearValue, resourceUpdates);
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}

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void QRhiCommandBuffer::endPass(QRhiResourceUpdateBatch *resourceUpdates)
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{
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    rhi->endPass(this, resourceUpdates);
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}

void QRhiCommandBuffer::setGraphicsPipeline(QRhiGraphicsPipeline *ps,
                                            QRhiShaderResourceBindings *srb)
{
    rhi->setGraphicsPipeline(this, ps, srb);
}

void QRhiCommandBuffer::setVertexInput(int startBinding, const QVector<VertexInput> &bindings,
                                       QRhiBuffer *indexBuf, quint32 indexOffset,
                                       IndexFormat indexFormat)
{
    rhi->setVertexInput(this, startBinding, bindings, indexBuf, indexOffset, indexFormat);
}

void QRhiCommandBuffer::setViewport(const QRhiViewport &viewport)
{
    rhi->setViewport(this, viewport);
}

void QRhiCommandBuffer::setScissor(const QRhiScissor &scissor)
{
    rhi->setScissor(this, scissor);
}

void QRhiCommandBuffer::setBlendConstants(const QVector4D &c)
{
    rhi->setBlendConstants(this, c);
}

void QRhiCommandBuffer::setStencilRef(quint32 refValue)
{
    rhi->setStencilRef(this, refValue);
}

void QRhiCommandBuffer::draw(quint32 vertexCount,
                             quint32 instanceCount, quint32 firstVertex, quint32 firstInstance)
{
    rhi->draw(this, vertexCount, instanceCount, firstVertex, firstInstance);
}

void QRhiCommandBuffer::drawIndexed(quint32 indexCount,
                                    quint32 instanceCount, quint32 firstIndex,
                                    qint32 vertexOffset, quint32 firstInstance)
{
    rhi->drawIndexed(this, indexCount, instanceCount, firstIndex, vertexOffset, firstInstance);
}

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void QRhiCommandBuffer::debugMarkBegin(const QByteArray &name)
{
    rhi->debugMarkBegin(this, name);
}

void QRhiCommandBuffer::debugMarkEnd()
{
    rhi->debugMarkEnd(this);
}

void QRhiCommandBuffer::debugMarkMsg(const QByteArray &msg)
{
    rhi->debugMarkMsg(this, msg);
}

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int QRhi::ubufAligned(int v) const
{
    const int byteAlign = ubufAlignment();
    return (v + byteAlign - 1) & ~(byteAlign - 1);
}

int QRhi::mipLevelsForSize(const QSize &size) const
{
    return qCeil(std::log2(qMax(size.width(), size.height()))) + 1;
}

QSize QRhi::sizeForMipLevel(int mipLevel, const QSize &baseLevelSize) const
{
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    const int w = qFloor(float(qMax(1, baseLevelSize.width() >> mipLevel)));
    const int h = qFloor(float(qMax(1, baseLevelSize.height() >> mipLevel)));
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    return QSize(w, h);
}

bool QRhi::isYUpInFramebuffer() const
{
    return d->isYUpInFramebuffer();
}

QMatrix4x4 QRhi::clipSpaceCorrMatrix() const
{
    return d->clipSpaceCorrMatrix();
}

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bool QRhi::isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags) const
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{
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    return d->isTextureFormatSupported(format, flags);
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}

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bool QRhi::isFeatureSupported(QRhi::Feature feature) const
{
    return d->isFeatureSupported(feature);
}

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int QRhi::resourceSizeLimit(ResourceSizeLimit limit) const
{
    return d->resourceSizeLimit(limit);
}

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const QRhiNativeHandles *QRhi::nativeHandles()
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{
    return d->nativeHandles();
}

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QRhiProfiler *QRhi::profiler()
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{
    return &d->profiler;
}

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QRhiGraphicsPipeline *QRhi::newGraphicsPipeline()
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{
    return d->createGraphicsPipeline();
}

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QRhiShaderResourceBindings *QRhi::newShaderResourceBindings()
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{
    return d->createShaderResourceBindings();
}

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QRhiBuffer *QRhi::newBuffer(QRhiBuffer::Type type,
                            QRhiBuffer::UsageFlags usage,
                            int size)
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{
    return d->createBuffer(type, usage, size);
}

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QRhiRenderBuffer *QRhi::newRenderBuffer(QRhiRenderBuffer::Type type,
                                        const QSize &pixelSize,
                                        int sampleCount,
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                                        QRhiRenderBuffer::Flags flags)
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{
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    return d->createRenderBuffer(type, pixelSize, sampleCount, flags);
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}

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QRhiTexture *QRhi::newTexture(QRhiTexture::Format format,
                              const QSize &pixelSize,
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                              int sampleCount,
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                              QRhiTexture::Flags flags)
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{
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    return d->createTexture(format, pixelSize, sampleCount, flags);
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}

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QRhiSampler *QRhi::newSampler(QRhiSampler::Filter magFilter, QRhiSampler::Filter minFilter,
                              QRhiSampler::Filter mipmapMode,
                              QRhiSampler:: AddressMode u, QRhiSampler::AddressMode v, QRhiSampler::AddressMode w)
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{
    return d->createSampler(magFilter, minFilter, mipmapMode, u, v, w);
}

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QRhiTextureRenderTarget *QRhi::newTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,
                                                      QRhiTextureRenderTarget::Flags flags)
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{
    return d->createTextureRenderTarget(desc, flags);
}

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QRhiSwapChain *QRhi::newSwapChain()
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{
    return d->createSwapChain();
}

QRhi::FrameOpResult QRhi::beginFrame(QRhiSwapChain *swapChain)
{
    return d->beginFrame(swapChain);
}

QRhi::FrameOpResult QRhi::endFrame(QRhiSwapChain *swapChain)
{
    return d->endFrame(swapChain);
}

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QRhi::FrameOpResult QRhi::beginOffscreenFrame(QRhiCommandBuffer **cb)
{
    return d->beginOffscreenFrame(cb);
}

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QRhi::FrameOpResult QRhi::endOffscreenFrame()
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{
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    return d->endOffscreenFrame();
}

QRhi::FrameOpResult QRhi::finish()
{
    return d->finish();
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}

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QVector<int> QRhi::supportedSampleCounts() const
{
    return d->supportedSampleCounts();
}

int QRhi::ubufAlignment() const
{
    return d->ubufAlignment();
}

QT_END_NAMESPACE