qrhigles2.cpp 79.2 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 "qrhigles2_p.h"
#include <QWindow>
#include <QOffscreenSurface>
#include <QOpenGLContext>
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#include <QtGui/private/qopenglextensions_p.h>
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#include <qmath.h>

QT_BEGIN_NAMESPACE

/*
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  OpenGL ES 2.0 (3.0) + GLSL 100/120 backend. Binding vertex attribute
  locations and decomposing uniform buffers into uniforms (as expected by the
  GLSL 1xx shader generated by SPIRV-Cross) are handled transparently to the
  application via the reflection data (QShaderDescription). Textures and
  buffers feature no special logic, it's all just glTexSubImage2D and
  glBufferSubData (with "dynamic" buffers set to GL_DYNAMIC_DRAW). The
  swapchain and the associated renderbuffer for depth-stencil will be dummies
  since we have no control over the underlying buffers here. It is up to the
  application to create the context and window with the appropriate
  QSurfaceFormat when it comes to depth/stencil and MSAA. While we try to keep
  this backend clean GLES 2.0, some GL(ES) 3.0 features like multisample
  renderbuffers and blits are used when available.
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*/

QRhiGles2::QRhiGles2(QRhiInitParams *params)
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    : ofr(this)
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{
    QRhiGles2InitParams *glparams = static_cast<QRhiGles2InitParams *>(params);
    ctx = glparams->context;
    maybeWindow = glparams->window; // may be null
    fallbackSurface = glparams->fallbackSurface;
}

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bool QRhiGles2::ensureContext(QSurface *surface) const
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{
    bool nativeWindowGone = false;
    if (surface && surface->surfaceClass() == QSurface::Window && !surface->surfaceHandle()) {
        surface = fallbackSurface;
        nativeWindowGone = true;
    }

    if (!surface)
        surface = fallbackSurface;

    if (buffersSwapped)
        buffersSwapped = false;
    else if (!nativeWindowGone && QOpenGLContext::currentContext() == ctx && (surface == fallbackSurface || ctx->surface() == surface))
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        return true;
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    if (!ctx->makeCurrent(surface)) {
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        qWarning("QRhiGles2: Failed to make context current. Expect bad things to happen.");
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        return false;
    }

    return true;
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}

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bool QRhiGles2::create(QRhi::Flags flags)
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{
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    Q_UNUSED(flags);
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    Q_ASSERT(ctx);
    Q_ASSERT(fallbackSurface);

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    if (!ensureContext(maybeWindow ? maybeWindow : fallbackSurface)) // see 'window' discussion in QRhiGles2InitParams comments
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        return false;
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    f = static_cast<QOpenGLExtensions *>(ctx->extraFunctions());
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    const char *vendor = reinterpret_cast<const char *>(f->glGetString(GL_VENDOR));
    const char *renderer = reinterpret_cast<const char *>(f->glGetString(GL_RENDERER));
    const char *version = reinterpret_cast<const char *>(f->glGetString(GL_VERSION));
    if (vendor && renderer && version)
        qDebug("OpenGL VENDOR: %s RENDERER: %s VERSION: %s", vendor, renderer, version);
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    GLint n = 0;
    f->glGetIntegerv(GL_NUM_COMPRESSED_TEXTURE_FORMATS, &n);
    supportedCompressedFormats.resize(n);
    if (n > 0)
        f->glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, supportedCompressedFormats.data());
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    caps.msaaRenderBuffer = f->hasOpenGLExtension(QOpenGLExtensions::FramebufferMultisample)
            && f->hasOpenGLExtension(QOpenGLExtensions::FramebufferBlit);
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    nativeHandlesStruct.context = ctx;

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    return true;
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}

void QRhiGles2::destroy()
{
    if (!f)
        return;

    ensureContext();
    executeDeferredReleases();

    f = nullptr;
}

// Strictly speaking this is not necessary since we could do the deletes in
// release(). However, it is kind of nice that no release() ever requires a
// current context and so GL calls are isolated to specific places (build,
// beginFrame, endFrame) as much as possible.
void QRhiGles2::executeDeferredReleases()
{
    for (int i = releaseQueue.count() - 1; i >= 0; --i) {
        const QRhiGles2::DeferredReleaseEntry &e(releaseQueue[i]);
        switch (e.type) {
        case QRhiGles2::DeferredReleaseEntry::Buffer:
            f->glDeleteBuffers(1, &e.buffer.buffer);
            break;
        case QRhiGles2::DeferredReleaseEntry::Pipeline:
            f->glDeleteProgram(e.pipeline.program);
            break;
        case QRhiGles2::DeferredReleaseEntry::Texture:
            f->glDeleteTextures(1, &e.texture.texture);
            break;
        case QRhiGles2::DeferredReleaseEntry::RenderBuffer:
            f->glDeleteRenderbuffers(1, &e.renderbuffer.renderbuffer);
            break;
        case QRhiGles2::DeferredReleaseEntry::TextureRenderTarget:
            f->glDeleteFramebuffers(1, &e.textureRenderTarget.framebuffer);
            break;
        default:
            break;
        }
        releaseQueue.removeAt(i);
    }
}

QVector<int> QRhiGles2::supportedSampleCounts() const
{
    return { 1 };
}

QRhiSwapChain *QRhiGles2::createSwapChain()
{
    return new QGles2SwapChain(this);
}

QRhiBuffer *QRhiGles2::createBuffer(QRhiBuffer::Type type, QRhiBuffer::UsageFlags usage, int size)
{
    return new QGles2Buffer(this, type, usage, size);
}

int QRhiGles2::ubufAlignment() const
{
    return 256;
}

bool QRhiGles2::isYUpInFramebuffer() const
{
    return true;
}

QMatrix4x4 QRhiGles2::clipSpaceCorrMatrix() const
{
    return QMatrix4x4(); // identity
}

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static inline GLenum toGlCompressedTextureFormat(QRhiTexture::Format format, QRhiTexture::Flags flags)
{
    const bool srgb = flags.testFlag(QRhiTexture::sRGB);
    switch (format) {
    case QRhiTexture::BC1:
        return srgb ? 0x8C4C : 0x83F0;
    case QRhiTexture::BC3:
        return srgb ? 0x8C4E : 0x83F2;
    case QRhiTexture::BC5:
        return srgb ? 0x8C4F : 0x83F3;

    case QRhiTexture::ETC2_RGB8:
        return srgb ? 0x9275 : 0x9274;
    case QRhiTexture::ETC2_RGB8A1:
        return srgb ? 0x9277 : 0x9276;
    case QRhiTexture::ETC2_RGBA8:
        return srgb ? 0x9279 : 0x9278;

    case QRhiTexture::ASTC_4x4:
        return srgb ? 0x93D0 : 0x93B0;
    case QRhiTexture::ASTC_5x4:
        return srgb ? 0x93D1 : 0x93B1;
    case QRhiTexture::ASTC_5x5:
        return srgb ? 0x93D2 : 0x93B2;
    case QRhiTexture::ASTC_6x5:
        return srgb ? 0x93D3 : 0x93B3;
    case QRhiTexture::ASTC_6x6:
        return srgb ? 0x93D4 : 0x93B4;
    case QRhiTexture::ASTC_8x5:
        return srgb ? 0x93D5 : 0x93B5;
    case QRhiTexture::ASTC_8x6:
        return srgb ? 0x93D6 : 0x93B6;
    case QRhiTexture::ASTC_8x8:
        return srgb ? 0x93D7 : 0x93B7;
    case QRhiTexture::ASTC_10x5:
        return srgb ? 0x93D8 : 0x93B8;
    case QRhiTexture::ASTC_10x6:
        return srgb ? 0x93D9 : 0x93B9;
    case QRhiTexture::ASTC_10x8:
        return srgb ? 0x93DA : 0x93BA;
    case QRhiTexture::ASTC_10x10:
        return srgb ? 0x93DB : 0x93BB;
    case QRhiTexture::ASTC_12x10:
        return srgb ? 0x93DC : 0x93BC;
    case QRhiTexture::ASTC_12x12:
        return srgb ? 0x93DD : 0x93BD;

    default:
        return 0; // this is reachable, just return an invalid format
    }
}

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bool QRhiGles2::isTextureFormatSupported(QRhiTexture::Format format, QRhiTexture::Flags flags) const
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{
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    if (isCompressedFormat(format))
        return supportedCompressedFormats.contains(toGlCompressedTextureFormat(format, flags));
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    return true;
}

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bool QRhiGles2::isFeatureSupported(QRhi::Feature feature) const
{
    switch (feature) {
    case QRhi::MultisampleTexture:
        return false;
    case QRhi::MultisampleRenderBuffer:
        return caps.msaaRenderBuffer;
    default:
        Q_UNREACHABLE();
        return false;
    }
}

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const QRhiNativeHandles *QRhiGles2::nativeHandles()
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{
    return &nativeHandlesStruct;
}

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QRhiRenderBuffer *QRhiGles2::createRenderBuffer(QRhiRenderBuffer::Type type, const QSize &pixelSize,
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                                                int sampleCount, QRhiRenderBuffer::Flags flags)
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{
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    return new QGles2RenderBuffer(this, type, pixelSize, sampleCount, flags);
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}

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QRhiTexture *QRhiGles2::createTexture(QRhiTexture::Format format, const QSize &pixelSize,
                                      int sampleCount, QRhiTexture::Flags flags)
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{
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    return new QGles2Texture(this, format, pixelSize, sampleCount, flags);
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}

QRhiSampler *QRhiGles2::createSampler(QRhiSampler::Filter magFilter, QRhiSampler::Filter minFilter,
                                      QRhiSampler::Filter mipmapMode,
                                      QRhiSampler::AddressMode u, QRhiSampler::AddressMode v, QRhiSampler::AddressMode w)
{
    return new QGles2Sampler(this, magFilter, minFilter, mipmapMode, u, v, w);
}

QRhiTextureRenderTarget *QRhiGles2::createTextureRenderTarget(const QRhiTextureRenderTargetDescription &desc,
                                                              QRhiTextureRenderTarget::Flags flags)
{
    return new QGles2TextureRenderTarget(this, desc, flags);
}

QRhiGraphicsPipeline *QRhiGles2::createGraphicsPipeline()
{
    return new QGles2GraphicsPipeline(this);
}

QRhiShaderResourceBindings *QRhiGles2::createShaderResourceBindings()
{
    return new QGles2ShaderResourceBindings(this);
}

void QRhiGles2::setGraphicsPipeline(QRhiCommandBuffer *cb, QRhiGraphicsPipeline *ps, QRhiShaderResourceBindings *srb)
{
    Q_ASSERT(inPass);

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    QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, ps);
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    if (!srb)
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        srb = psD->m_shaderResourceBindings;
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    QGles2ShaderResourceBindings *srbD = QRHI_RES(QGles2ShaderResourceBindings, srb);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    const bool pipelineChanged = cbD->currentPipeline != ps || cbD->currentPipelineGeneration != psD->generation;
    const bool srbChanged = cbD->currentSrb != srb || cbD->currentSrbGeneration != srbD->generation;

    if (pipelineChanged || srbChanged) {
        cbD->currentPipeline = ps;
        cbD->currentPipelineGeneration = psD->generation;
        cbD->currentSrb = srb;
        cbD->currentSrbGeneration = srbD->generation;

        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindGraphicsPipeline;
        cmd.args.bindGraphicsPipeline.ps = ps;
        cmd.args.bindGraphicsPipeline.srb = srb;
        cmd.args.bindGraphicsPipeline.resOnlyChange = !pipelineChanged && srbChanged;
        cbD->commands.append(cmd);
    }
}

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void QRhiGles2::setVertexInput(QRhiCommandBuffer *cb, int startBinding, const QVector<QRhiCommandBuffer::VertexInput> &bindings,
                               QRhiBuffer *indexBuf, quint32 indexOffset, QRhiCommandBuffer::IndexFormat indexFormat)
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{
    Q_ASSERT(inPass);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    for (int i = 0, ie = bindings.count(); i != ie; ++i) {
        QRhiBuffer *buf = bindings[i].first;
        quint32 ofs = bindings[i].second;
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, buf);
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        Q_ASSERT(bufD->m_usage.testFlag(QRhiBuffer::VertexBuffer));
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        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindVertexBuffer;
        cmd.args.bindVertexBuffer.ps = cbD->currentPipeline;
        cmd.args.bindVertexBuffer.buffer = bufD->buffer;
        cmd.args.bindVertexBuffer.offset = ofs;
        cmd.args.bindVertexBuffer.binding = startBinding + i;
        cbD->commands.append(cmd);
    }

    if (indexBuf) {
        QGles2Buffer *ibufD = QRHI_RES(QGles2Buffer, indexBuf);
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        Q_ASSERT(ibufD->m_usage.testFlag(QRhiBuffer::IndexBuffer));
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        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::BindIndexBuffer;
        cmd.args.bindIndexBuffer.buffer = ibufD->buffer;
        cmd.args.bindIndexBuffer.offset = indexOffset;
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        cmd.args.bindIndexBuffer.type = indexFormat == QRhiCommandBuffer::IndexUInt16 ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT;
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        cbD->commands.append(cmd);
    }
}

void QRhiGles2::setViewport(QRhiCommandBuffer *cb, const QRhiViewport &viewport)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Viewport;
    cmd.args.viewport.x = viewport.r.x();
    cmd.args.viewport.y = viewport.r.y();
    cmd.args.viewport.w = viewport.r.z();
    cmd.args.viewport.h = viewport.r.w();
    cmd.args.viewport.d0 = viewport.minDepth;
    cmd.args.viewport.d1 = viewport.maxDepth;
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setScissor(QRhiCommandBuffer *cb, const QRhiScissor &scissor)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Scissor;
    cmd.args.scissor.x = scissor.r.x();
    cmd.args.scissor.y = scissor.r.y();
    cmd.args.scissor.w = scissor.r.z();
    cmd.args.scissor.h = scissor.r.w();
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setBlendConstants(QRhiCommandBuffer *cb, const QVector4D &c)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::BlendConstants;
    cmd.args.blendConstants.r = c.x();
    cmd.args.blendConstants.g = c.y();
    cmd.args.blendConstants.b = c.z();
    cmd.args.blendConstants.a = c.w();
    QRHI_RES(QGles2CommandBuffer, cb)->commands.append(cmd);
}

void QRhiGles2::setStencilRef(QRhiCommandBuffer *cb, quint32 refValue)
{
    Q_ASSERT(inPass);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::StencilRef;
    cmd.args.stencilRef.ref = refValue;
    cmd.args.stencilRef.ps = cbD->currentPipeline;
    cbD->commands.append(cmd);
}

void QRhiGles2::draw(QRhiCommandBuffer *cb, quint32 vertexCount,
                     quint32 instanceCount, quint32 firstVertex, quint32 firstInstance)
{
    Q_ASSERT(inPass);
    Q_UNUSED(instanceCount); // no instancing
    Q_UNUSED(firstInstance);
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::Draw;
    cmd.args.draw.ps = cbD->currentPipeline;
    cmd.args.draw.vertexCount = vertexCount;
    cmd.args.draw.firstVertex = firstVertex;
    cbD->commands.append(cmd);
}

void QRhiGles2::drawIndexed(QRhiCommandBuffer *cb, quint32 indexCount,
                            quint32 instanceCount, quint32 firstIndex, qint32 vertexOffset, quint32 firstInstance)
{
    Q_ASSERT(inPass);
    Q_UNUSED(instanceCount); // no instancing
    Q_UNUSED(firstInstance);
    Q_UNUSED(vertexOffset); // no glDrawElementsBaseVertex
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);

    QGles2CommandBuffer::Command cmd;
    cmd.cmd = QGles2CommandBuffer::Command::DrawIndexed;
    cmd.args.drawIndexed.ps = cbD->currentPipeline;
    cmd.args.drawIndexed.indexCount = indexCount;
    cmd.args.drawIndexed.firstIndex = firstIndex;
    cbD->commands.append(cmd);
}

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void QRhiGles2::debugMarkBegin(QRhiCommandBuffer *cb, const QByteArray &name)
{
    if (!debugMarkers)
        return;

    Q_UNUSED(cb);
    Q_UNUSED(name);
}

void QRhiGles2::debugMarkEnd(QRhiCommandBuffer *cb)
{
    if (!debugMarkers)
        return;

    Q_UNUSED(cb);
}

void QRhiGles2::debugMarkMsg(QRhiCommandBuffer *cb, const QByteArray &msg)
{
    if (!debugMarkers)
        return;

    Q_UNUSED(cb);
    Q_UNUSED(msg);
}

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QRhi::FrameOpResult QRhiGles2::beginFrame(QRhiSwapChain *swapChain)
{
    Q_ASSERT(!inFrame);

    QGles2SwapChain *swapChainD = QRHI_RES(QGles2SwapChain, swapChain);
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    if (!ensureContext(swapChainD->surface))
        return QRhi::FrameOpError;

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    inFrame = true;
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    currentSwapChain = swapChainD;
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    executeDeferredReleases();
    QRHI_RES(QGles2CommandBuffer, &swapChainD->cb)->resetState();

    return QRhi::FrameOpSuccess;
}

QRhi::FrameOpResult QRhiGles2::endFrame(QRhiSwapChain *swapChain)
{
    Q_ASSERT(inFrame);
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    inFrame = false;
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    QGles2SwapChain *swapChainD = QRHI_RES(QGles2SwapChain, swapChain);
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    if (!ensureContext(swapChainD->surface))
        return QRhi::FrameOpError;

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    executeCommandBuffer(&swapChainD->cb);

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    currentSwapChain = nullptr;
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    ++finishedFrameCount;

    if (swapChainD->surface) {
        ctx->swapBuffers(swapChainD->surface);
        buffersSwapped = true;
    }

    return QRhi::FrameOpSuccess;
}

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QRhi::FrameOpResult QRhiGles2::beginOffscreenFrame(QRhiCommandBuffer **cb)
{
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    Q_ASSERT(!inFrame);

    if (!ensureContext())
        return QRhi::FrameOpError;

    inFrame = true;
    ofr.active = true;

    executeDeferredReleases();
    ofr.cbWrapper.resetState();
    *cb = &ofr.cbWrapper;

    return QRhi::FrameOpSuccess;
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}

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QRhi::FrameOpResult QRhiGles2::endOffscreenFrame()
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{
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    Q_ASSERT(inFrame && ofr.active);
    inFrame = false;
    ofr.active = false;

    if (!ensureContext())
        return QRhi::FrameOpError;

    executeCommandBuffer(&ofr.cbWrapper);

    ++finishedFrameCount;
    return QRhi::FrameOpSuccess;;
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}

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QRhi::FrameOpResult QRhiGles2::finish()
{
    Q_ASSERT(!inPass);
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    if (inFrame) {
        if (ofr.active) {
            Q_ASSERT(!currentSwapChain);
            if (!ensureContext())
                return QRhi::FrameOpError;
            executeCommandBuffer(&ofr.cbWrapper);
            ofr.cbWrapper.resetCommands();
        } else {
            Q_ASSERT(currentSwapChain);
            if (!ensureContext(currentSwapChain->surface))
                return QRhi::FrameOpError;
            executeCommandBuffer(&currentSwapChain->cb);
            currentSwapChain->cb.resetCommands();
        }
    }
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    return QRhi::FrameOpSuccess;
}

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void QRhiGles2::enqueueResourceUpdates(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
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{
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    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
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    QRhiResourceUpdateBatchPrivate *ud = QRhiResourceUpdateBatchPrivate::get(resourceUpdates);

    for (const QRhiResourceUpdateBatchPrivate::DynamicBufferUpdate &u : ud->dynamicBufferUpdates) {
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, u.buf);
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        Q_ASSERT(bufD->m_type == QRhiBuffer::Dynamic);
        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
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            memcpy(bufD->ubuf.data() + u.offset, u.data.constData(), u.data.size());
            QGles2Buffer::ChangeRange &r(bufD->ubufChangeRange);
            if (r.changeBegin == -1 || u.offset < r.changeBegin)
                r.changeBegin = u.offset;
            if (r.changeEnd == -1 || u.offset + u.data.size() > r.changeEnd)
                r.changeEnd = u.offset + u.data.size();
        } else {
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            QGles2CommandBuffer::Command cmd;
            cmd.cmd = QGles2CommandBuffer::Command::BufferSubData;
            cmd.args.bufferSubData.target = bufD->target;
            cmd.args.bufferSubData.buffer = bufD->buffer;
            cmd.args.bufferSubData.offset = u.offset;
            cmd.args.bufferSubData.size = u.data.size();
            cmd.args.bufferSubData.data = cbD->retainData(u.data);
            cbD->commands.append(cmd);
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        }
    }

    for (const QRhiResourceUpdateBatchPrivate::StaticBufferUpload &u : ud->staticBufferUploads) {
        QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, u.buf);
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        Q_ASSERT(bufD->m_type != QRhiBuffer::Dynamic);
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        Q_ASSERT(u.offset + u.data.size() <= bufD->m_size);
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        if (bufD->m_usage.testFlag(QRhiBuffer::UniformBuffer)) {
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            memcpy(bufD->ubuf.data() + u.offset, u.data.constData(), u.data.size());
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            bufD->ubufChangeRange = { 0, u.data.size() };
        } else {
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            QGles2CommandBuffer::Command cmd;
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            cmd.cmd = QGles2CommandBuffer::Command::BufferSubData;
            cmd.args.bufferSubData.target = bufD->target;
            cmd.args.bufferSubData.buffer = bufD->buffer;
            cmd.args.bufferSubData.offset = u.offset;
            cmd.args.bufferSubData.size = u.data.size();
            cmd.args.bufferSubData.data = cbD->retainData(u.data);
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            cbD->commands.append(cmd);
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        }
    }

    for (const QRhiResourceUpdateBatchPrivate::TextureUpload &u : ud->textureUploads) {
        QGles2Texture *texD = QRHI_RES(QGles2Texture, u.tex);
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        const bool isCompressed = isCompressedFormat(texD->m_format);
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        const bool isCubeMap = texD->m_flags.testFlag(QRhiTexture::CubeMap);
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        const GLenum faceTargetBase = isCubeMap ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : texD->target;
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        for (int layer = 0, layerCount = u.desc.layers.count(); layer != layerCount; ++layer) {
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            const QRhiTextureUploadDescription::Layer &layerDesc(u.desc.layers[layer]);
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            for (int level = 0, levelCount = layerDesc.mipImages.count(); level != levelCount; ++level) {
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                const QRhiTextureUploadDescription::Layer::MipLevel mipDesc(layerDesc.mipImages[level]);
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                const int dx = mipDesc.destinationTopLeft.x();
                const int dy = mipDesc.destinationTopLeft.y();
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                if (isCompressed && !mipDesc.compressedData.isEmpty()) {
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                    int w, h;
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                    if (mipDesc.sourceSize.isEmpty()) {
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                        w = qFloor(float(qMax(1, texD->m_pixelSize.width() >> level)));
                        h = qFloor(float(qMax(1, texD->m_pixelSize.height() >> level)));
                    } else {
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                        w = mipDesc.sourceSize.width();
                        h = mipDesc.sourceSize.height();
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                    }
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                    if (texD->specified) {
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                        QGles2CommandBuffer::Command cmd;
                        cmd.cmd = QGles2CommandBuffer::Command::CompressedSubImage;
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                        cmd.args.compressedSubImage.dst = texD;
                        cmd.args.compressedSubImage.faceTarget = faceTargetBase + layer;
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                        cmd.args.compressedSubImage.level = level;
                        cmd.args.compressedSubImage.dx = dx;
                        cmd.args.compressedSubImage.dy = dy;
                        cmd.args.compressedSubImage.w = w;
                        cmd.args.compressedSubImage.h = h;
                        cmd.args.compressedSubImage.glintformat = texD->glintformat;
                        cmd.args.compressedSubImage.size = mipDesc.compressedData.size();
                        cmd.args.compressedSubImage.data = cbD->retainData(mipDesc.compressedData);
                        cbD->commands.append(cmd);
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                    } else {
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                        QGles2CommandBuffer::Command cmd;
                        cmd.cmd = QGles2CommandBuffer::Command::CompressedImage;
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                        cmd.args.compressedImage.dst = texD;
                        cmd.args.compressedImage.faceTarget = faceTargetBase + layer;
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                        cmd.args.compressedImage.level = level;
                        cmd.args.compressedImage.glintformat = texD->glintformat;
                        cmd.args.compressedImage.w = w;
                        cmd.args.compressedImage.h = h;
                        cmd.args.compressedImage.size = mipDesc.compressedData.size();
                        cmd.args.compressedImage.data = cbD->retainData(mipDesc.compressedData);
                        cbD->commands.append(cmd);
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                    }
                } else {
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                    QImage img = mipDesc.image;
                    int w = img.width();
                    int h = img.height();
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                    QGles2CommandBuffer::Command cmd;
                    cmd.cmd = QGles2CommandBuffer::Command::SubImage;
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                    if (!mipDesc.sourceSize.isEmpty() || !mipDesc.sourceTopLeft.isNull()) {
                        const int sx = mipDesc.sourceTopLeft.x();
                        const int sy = mipDesc.sourceTopLeft.y();
                        if (!mipDesc.sourceSize.isEmpty()) {
                            w = mipDesc.sourceSize.width();
                            h = mipDesc.sourceSize.height();
                        }
                        img = img.copy(sx, sy, w, h);
                    }
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                    cmd.args.subImage.dst = texD;
                    cmd.args.subImage.faceTarget = faceTargetBase + layer;
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                    cmd.args.subImage.level = level;
                    cmd.args.subImage.dx = dx;
                    cmd.args.subImage.dy = dy;
                    cmd.args.subImage.w = w;
                    cmd.args.subImage.h = h;
                    cmd.args.subImage.glformat = texD->glformat;
                    cmd.args.subImage.gltype = texD->gltype;
                    cmd.args.subImage.data = cbD->retainImage(img);
                    cbD->commands.append(cmd);
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                }
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            }
        }
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        texD->specified = true;
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    }

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    for (const QRhiResourceUpdateBatchPrivate::TextureCopy &u : ud->textureCopies) {
        Q_ASSERT(u.src && u.dst);
        QGles2Texture *srcD = QRHI_RES(QGles2Texture, u.src);
        QGles2Texture *dstD = QRHI_RES(QGles2Texture, u.dst);

        const QSize size = u.desc.pixelSize.isEmpty() ? srcD->m_pixelSize : u.desc.pixelSize;
        // source offset is bottom-left
        const float sx = u.desc.sourceTopLeft.x();
        const float sy = srcD->m_pixelSize.height() - (u.desc.sourceTopLeft.y() + size.height() - 1);
        // destination offset is top-left
        const float dx = u.desc.destinationTopLeft.x();
        const float dy = u.desc.destinationTopLeft.y();

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        const GLenum srcFaceTargetBase = srcD->m_flags.testFlag(QRhiTexture::CubeMap) ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : srcD->target;
        const GLenum dstFaceTargetBase = dstD->m_flags.testFlag(QRhiTexture::CubeMap) ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : dstD->target;
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        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::CopyTex;
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        cmd.args.copyTex.srcFaceTarget = srcFaceTargetBase + u.desc.sourceLayer;
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        cmd.args.copyTex.srcTexture = srcD->texture;
        cmd.args.copyTex.srcLevel = u.desc.sourceLevel;
        cmd.args.copyTex.srcX = sx;
        cmd.args.copyTex.srcY = sy;

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        cmd.args.copyTex.dst = dstD;
        cmd.args.copyTex.dstFaceTarget = dstFaceTargetBase + u.desc.destinationLayer;
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        cmd.args.copyTex.dstLevel = u.desc.destinationLevel;
        cmd.args.copyTex.dstX = dx;
        cmd.args.copyTex.dstY = dy;

        cmd.args.copyTex.w = size.width();
        cmd.args.copyTex.h = size.height();

        cbD->commands.append(cmd);
    }

    for (const QRhiResourceUpdateBatchPrivate::TextureRead &u : ud->textureReadbacks) {
        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::ReadPixels;
        cmd.args.readPixels.result = u.result;
        cmd.args.readPixels.texture = QRHI_RES(QGles2Texture, u.rb.texture);
        cmd.args.readPixels.layer = u.rb.layer;
        cmd.args.readPixels.level = u.rb.level;
        cbD->commands.append(cmd);
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    }

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    for (const QRhiResourceUpdateBatchPrivate::TextureMipGen &u : ud->textureMipGens) {
        QGles2CommandBuffer::Command cmd;
        cmd.cmd = QGles2CommandBuffer::Command::GenMip;
        cmd.args.genMip.tex = QRHI_RES(QGles2Texture, u.tex);
        cbD->commands.append(cmd);
    }

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    ud->free();
}

static inline GLenum toGlTopology(QRhiGraphicsPipeline::Topology t)
{
    switch (t) {
    case QRhiGraphicsPipeline::Triangles:
        return GL_TRIANGLES;
    case QRhiGraphicsPipeline::TriangleStrip:
        return GL_TRIANGLE_STRIP;
    case QRhiGraphicsPipeline::Lines:
        return GL_LINES;
    case QRhiGraphicsPipeline::LineStrip:
        return GL_LINE_STRIP;
    case QRhiGraphicsPipeline::Points:
        return GL_POINTS;
    default:
        Q_UNREACHABLE();
        return GL_TRIANGLES;
    }
}

static inline GLenum toGlCullMode(QRhiGraphicsPipeline::CullMode c)
{
    switch (c) {
    case QRhiGraphicsPipeline::Front:
        return GL_FRONT;
    case QRhiGraphicsPipeline::Back:
        return GL_BACK;
    default:
        Q_UNREACHABLE();
        return GL_BACK;
    }
}

static inline GLenum toGlFrontFace(QRhiGraphicsPipeline::FrontFace f)
{
    switch (f) {
    case QRhiGraphicsPipeline::CCW:
        return GL_CCW;
    case QRhiGraphicsPipeline::CW:
        return GL_CW;
    default:
        Q_UNREACHABLE();
        return GL_CCW;
    }
}

static inline GLenum toGlBlendFactor(QRhiGraphicsPipeline::BlendFactor f)
{
    switch (f) {
    case QRhiGraphicsPipeline::Zero:
        return GL_ZERO;
    case QRhiGraphicsPipeline::One:
        return GL_ONE;
    case QRhiGraphicsPipeline::SrcColor:
        return GL_SRC_COLOR;
    case QRhiGraphicsPipeline::OneMinusSrcColor:
        return GL_ONE_MINUS_SRC_COLOR;
    case QRhiGraphicsPipeline::DstColor:
        return GL_DST_COLOR;
    case QRhiGraphicsPipeline::OneMinusDstColor:
        return GL_ONE_MINUS_DST_COLOR;
    case QRhiGraphicsPipeline::SrcAlpha:
        return GL_SRC_ALPHA;
    case QRhiGraphicsPipeline::OneMinusSrcAlpha:
        return GL_ONE_MINUS_SRC_ALPHA;
    case QRhiGraphicsPipeline::DstAlpha:
        return GL_DST_ALPHA;
    case QRhiGraphicsPipeline::OneMinusDstAlpha:
        return GL_ONE_MINUS_DST_ALPHA;
    case QRhiGraphicsPipeline::ConstantColor:
        return GL_CONSTANT_COLOR;
    case QRhiGraphicsPipeline::OneMinusConstantColor:
        return GL_ONE_MINUS_CONSTANT_COLOR;
    case QRhiGraphicsPipeline::ConstantAlpha:
        return GL_CONSTANT_ALPHA;
    case QRhiGraphicsPipeline::OneMinusConstantAlpha:
        return GL_ONE_MINUS_CONSTANT_ALPHA;
    case QRhiGraphicsPipeline::SrcAlphaSaturate:
        return GL_SRC_ALPHA_SATURATE;
    case QRhiGraphicsPipeline::Src1Color:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::OneMinusSrc1Color:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::Src1Alpha:
        Q_FALLTHROUGH();
    case QRhiGraphicsPipeline::OneMinusSrc1Alpha:
        qWarning("Unsupported blend factor %d", f);
        return GL_ZERO;
    default:
        Q_UNREACHABLE();
        return GL_ZERO;
    }
}

static inline GLenum toGlBlendOp(QRhiGraphicsPipeline::BlendOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::Add:
        return GL_FUNC_ADD;
    case QRhiGraphicsPipeline::Subtract:
        return GL_FUNC_SUBTRACT;
    case QRhiGraphicsPipeline::ReverseSubtract:
        return GL_FUNC_REVERSE_SUBTRACT;
    case QRhiGraphicsPipeline::Min:
        return GL_MIN;
    case QRhiGraphicsPipeline::Max:
        return GL_MAX;
    default:
        Q_UNREACHABLE();
        return GL_FUNC_ADD;
    }
}

static inline GLenum toGlCompareOp(QRhiGraphicsPipeline::CompareOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::Never:
        return GL_NEVER;
    case QRhiGraphicsPipeline::Less:
        return GL_LESS;
    case QRhiGraphicsPipeline::Equal:
        return GL_EQUAL;
    case QRhiGraphicsPipeline::LessOrEqual:
        return GL_LEQUAL;
    case QRhiGraphicsPipeline::Greater:
        return GL_GREATER;
    case QRhiGraphicsPipeline::NotEqual:
        return GL_NOTEQUAL;
    case QRhiGraphicsPipeline::GreaterOrEqual:
        return GL_GEQUAL;
    case QRhiGraphicsPipeline::Always:
        return GL_ALWAYS;
    default:
        Q_UNREACHABLE();
        return GL_ALWAYS;
    }
}

static inline GLenum toGlStencilOp(QRhiGraphicsPipeline::StencilOp op)
{
    switch (op) {
    case QRhiGraphicsPipeline::StencilZero:
        return GL_ZERO;
    case QRhiGraphicsPipeline::Keep:
        return GL_KEEP;
    case QRhiGraphicsPipeline::Replace:
        return GL_REPLACE;
    case QRhiGraphicsPipeline::IncrementAndClamp:
        return GL_INCR;
    case QRhiGraphicsPipeline::DecrementAndClamp:
        return GL_DECR;
    case QRhiGraphicsPipeline::Invert:
        return GL_INVERT;
    case QRhiGraphicsPipeline::IncrementAndWrap:
        return GL_INCR_WRAP;
    case QRhiGraphicsPipeline::DecrementAndWrap:
        return GL_DECR_WRAP;
    default:
        Q_UNREACHABLE();
        return GL_KEEP;
    }
}

static inline GLenum toGlMinFilter(QRhiSampler::Filter f, QRhiSampler::Filter m)
{
    switch (f) {
    case QRhiSampler::Nearest:
        if (m == QRhiSampler::None)
            return GL_NEAREST;
        else
            return m == QRhiSampler::Nearest ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST_MIPMAP_LINEAR;
    case QRhiSampler::Linear:
        if (m == QRhiSampler::None)
            return GL_LINEAR;
        else
            return m == QRhiSampler::Nearest ? GL_LINEAR_MIPMAP_NEAREST : GL_LINEAR_MIPMAP_LINEAR;
    default:
        Q_UNREACHABLE();
        return GL_LINEAR;
    }
}

static inline GLenum toGlMagFilter(QRhiSampler::Filter f)
{
    switch (f) {
    case QRhiSampler::Nearest:
        return GL_NEAREST;
    case QRhiSampler::Linear:
        return GL_LINEAR;
    default:
        Q_UNREACHABLE();
        return GL_LINEAR;
    }
}

static inline GLenum toGlWrapMode(QRhiSampler::AddressMode m)
{
    switch (m) {
    case QRhiSampler::Repeat:
        return GL_REPEAT;
    case QRhiSampler::ClampToEdge:
        return GL_CLAMP_TO_EDGE;
    case QRhiSampler::Mirror:
        return GL_MIRRORED_REPEAT;
    case QRhiSampler::MirrorOnce:
        Q_FALLTHROUGH();
    case QRhiSampler::Border:
        qWarning("Unsupported wrap mode %d", m);
        return GL_CLAMP_TO_EDGE;
    default:
        Q_UNREACHABLE();
        return GL_CLAMP_TO_EDGE;
    }
}

void QRhiGles2::executeCommandBuffer(QRhiCommandBuffer *cb)
{
    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
    GLenum indexType = GL_UNSIGNED_SHORT;
    quint32 indexStride = sizeof(quint16);
    quint32 indexOffset = 0;

    for (const QGles2CommandBuffer::Command &cmd : qAsConst(cbD->commands)) {
        switch (cmd.cmd) {
        case QGles2CommandBuffer::Command::Viewport:
            f->glViewport(cmd.args.viewport.x, cmd.args.viewport.y, cmd.args.viewport.w, cmd.args.viewport.h);
            f->glDepthRangef(cmd.args.viewport.d0, cmd.args.viewport.d1);
            break;
        case QGles2CommandBuffer::Command::Scissor:
            f->glScissor(cmd.args.scissor.x, cmd.args.scissor.y, cmd.args.scissor.w, cmd.args.scissor.h);
            break;
        case QGles2CommandBuffer::Command::BlendConstants:
            f->glBlendColor(cmd.args.blendConstants.r, cmd.args.blendConstants.g, cmd.args.blendConstants.b, cmd.args.blendConstants.a);
            break;
        case QGles2CommandBuffer::Command::StencilRef:
        {
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            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.stencilRef.ps);
            if (psD) {
                f->glStencilFuncSeparate(GL_FRONT, toGlCompareOp(psD->m_stencilFront.compareOp), cmd.args.stencilRef.ref, psD->m_stencilReadMask);
                f->glStencilFuncSeparate(GL_BACK, toGlCompareOp(psD->m_stencilBack.compareOp), cmd.args.stencilRef.ref, psD->m_stencilReadMask);
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            } else {
                qWarning("No graphics pipeline active for setStencilRef; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindVertexBuffer:
        {
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            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.bindVertexBuffer.ps);
            if (psD) {
                for (const QRhiVertexInputLayout::Attribute &a : psD->m_vertexInputLayout.attributes) {
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                    if (a.binding != cmd.args.bindVertexBuffer.binding)
                        continue;

                    // we do not support more than one vertex buffer
                    f->glBindBuffer(GL_ARRAY_BUFFER, cmd.args.bindVertexBuffer.buffer);

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                    const int stride = psD->m_vertexInputLayout.bindings[a.binding].stride;
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                    int size = 1;
                    GLenum type = GL_FLOAT;
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                    bool normalize = false;
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                    switch (a.format) {
                    case QRhiVertexInputLayout::Attribute::Float4:
                        type = GL_FLOAT;
                        size = 4;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float3:
                        type = GL_FLOAT;
                        size = 3;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float2:
                        type = GL_FLOAT;
                        size = 2;
                        break;
                    case QRhiVertexInputLayout::Attribute::Float:
                        type = GL_FLOAT;
                        size = 1;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte4:
                        type = GL_UNSIGNED_BYTE;
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                        normalize = true;
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                        size = 4;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte2:
                        type = GL_UNSIGNED_BYTE;
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                        normalize = true;
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                        size = 2;
                        break;
                    case QRhiVertexInputLayout::Attribute::UNormByte:
                        type = GL_UNSIGNED_BYTE;
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                        normalize = true;
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                        size = 1;
                        break;
                    default:
                        break;
                    }
                    quint32 ofs = a.offset + cmd.args.bindVertexBuffer.offset;
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                    f->glVertexAttribPointer(a.location, size, type, normalize, stride,
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                                             reinterpret_cast<const GLvoid *>(quintptr(ofs)));
                    f->glEnableVertexAttribArray(a.location);
                }
            } else {
                qWarning("No graphics pipeline active for setVertexInput; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindIndexBuffer:
            indexType = cmd.args.bindIndexBuffer.type;
            indexStride = indexType == GL_UNSIGNED_SHORT ? sizeof(quint16) : sizeof(quint32);
            indexOffset = cmd.args.bindIndexBuffer.offset;
            f->glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cmd.args.bindIndexBuffer.buffer);
            break;
        case QGles2CommandBuffer::Command::Draw:
        {
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            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.draw.ps);
            if (psD)
                f->glDrawArrays(psD->drawMode, cmd.args.draw.firstVertex, cmd.args.draw.vertexCount);
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            else
                qWarning("No graphics pipeline active for draw; ignored");
        }
            break;
        case QGles2CommandBuffer::Command::DrawIndexed:
        {
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            QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, cmd.args.drawIndexed.ps);
            if (psD) {
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                quint32 ofs = cmd.args.drawIndexed.firstIndex * indexStride + indexOffset;
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                f->glDrawElements(psD->drawMode,
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                                  cmd.args.drawIndexed.indexCount,
                                  indexType,
                                  reinterpret_cast<const GLvoid *>(quintptr(ofs)));
            } else {
                qWarning("No graphics pipeline active for drawIndexed; ignored");
            }
        }
            break;
        case QGles2CommandBuffer::Command::BindGraphicsPipeline:
            if (cmd.args.bindGraphicsPipeline.resOnlyChange) {
                setChangedUniforms(QRHI_RES(QGles2GraphicsPipeline, cmd.args.bindGraphicsPipeline.ps),
                                   cmd.args.bindGraphicsPipeline.srb,
                                   false);
            } else {
                executeBindGraphicsPipeline(cmd.args.bindGraphicsPipeline.ps, cmd.args.bindGraphicsPipeline.srb);
            }
            break;
        case QGles2CommandBuffer::Command::BindFramebuffer:
            if (cmd.args.bindFramebuffer.rt)
                f->glBindFramebuffer(GL_FRAMEBUFFER,
                                     QRHI_RES(QGles2TextureRenderTarget, cmd.args.bindFramebuffer.rt)->framebuffer);
            else
                f->glBindFramebuffer(GL_FRAMEBUFFER, ctx->defaultFramebufferObject());
            break;
        case QGles2CommandBuffer::Command::Clear:
            f->glDisable(GL_SCISSOR_TEST);
            if (cmd.args.clear.mask & GL_COLOR_BUFFER_BIT) {
                f->glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
                f->glClearColor(cmd.args.clear.c[0], cmd.args.clear.c[1], cmd.args.clear.c[2], cmd.args.clear.c[3]);
            }
            if (cmd.args.clear.mask & GL_DEPTH_BUFFER_BIT) {
                f->glDepthMask(GL_TRUE);
                f->glClearDepthf(cmd.args.clear.d);
            }
            if (cmd.args.clear.mask & GL_STENCIL_BUFFER_BIT) {
                f->glStencilMask(GL_TRUE);
                f->glClearStencil(cmd.args.clear.s);
            }
            f->glClear(cmd.args.clear.mask);
            break;
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        case QGles2CommandBuffer::Command::BufferSubData:
            f->glBindBuffer(cmd.args.bufferSubData.target, cmd.args.bufferSubData.buffer);
            f->glBufferSubData(cmd.args.bufferSubData.target, cmd.args.bufferSubData.offset, cmd.args.bufferSubData.size,
                               cmd.args.bufferSubData.data);
            break;
        case QGles2CommandBuffer::Command::CopyTex:
        {
            GLuint fbo;
            f->glGenFramebuffers(1, &fbo);
            f->glBindFramebuffer(GL_FRAMEBUFFER, fbo);
            f->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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                                      cmd.args.copyTex.srcFaceTarget, cmd.args.copyTex.srcTexture, cmd.args.copyTex.srcLevel);
            f->glBindTexture(cmd.args.copyTex.dst->target, cmd.args.copyTex.dst->texture);
            f->glCopyTexSubImage2D(cmd.args.copyTex.dstFaceTarget, cmd.args.copyTex.dstLevel,
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                                   cmd.args.copyTex.dstX, cmd.args.copyTex.dstY,
                                   cmd.args.copyTex.srcX, cmd.args.copyTex.srcY,
                                   cmd.args.copyTex.w, cmd.args.copyTex.h);
            f->glBindFramebuffer(GL_FRAMEBUFFER, ctx->defaultFramebufferObject());
            f->glDeleteFramebuffers(1, &fbo);
        }
            break;
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        case QGles2CommandBuffer::Command::ReadPixels:
        {
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            // ### more formats
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            QRhiReadbackResult *result = cmd.args.readPixels.result;
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            QGles2Texture *texD = cmd.args.readPixels.texture;
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            GLuint fbo = 0;
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            if (texD) {
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                result->pixelSize = texD->m_pixelSize;
                result->format = texD->m_format;
                f->glGenFramebuffers(1, &fbo);
                f->glBindFramebuffer(GL_FRAMEBUFFER, fbo);
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                const GLenum faceTargetBase = texD->m_flags.testFlag(QRhiTexture::CubeMap) ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : texD->target;
                f->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, faceTargetBase + cmd.args.readPixels.layer, texD->texture, cmd.args.readPixels.level);
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            } else {
                result->pixelSize = currentSwapChain->pixelSize;
                result->format = QRhiTexture::RGBA8;
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                // readPixels handles multisample resolving implicitly
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            }
            result->data.resize(result->pixelSize.width() * result->pixelSize.height() * 4);
            f->glReadPixels(0, 0, result->pixelSize.width(), result->pixelSize.height(),
                            GL_RGBA, GL_UNSIGNED_BYTE,
                            result->data.data());
            if (fbo) {
                f->glBindFramebuffer(GL_FRAMEBUFFER, ctx->defaultFramebufferObject());
                f->glDeleteFramebuffers(1, &fbo);
            }
            if (result->completed)
                result->completed();
        }
            break;
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        case QGles2CommandBuffer::Command::SubImage:
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            f->glBindTexture(cmd.args.subImage.dst->target, cmd.args.subImage.dst->texture);
            f->glTexSubImage2D(cmd.args.subImage.faceTarget, cmd.args.subImage.level,
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                               cmd.args.subImage.dx, cmd.args.subImage.dy,
                               cmd.args.subImage.w, cmd.args.subImage.h,
                               cmd.args.subImage.glformat, cmd.args.subImage.gltype,
                               cmd.args.subImage.data);
            break;
        case QGles2CommandBuffer::Command::CompressedImage:
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            f->glBindTexture(cmd.args.compressedImage.dst->target, cmd.args.compressedImage.dst->texture);
            f->glCompressedTexImage2D(cmd.args.compressedImage.faceTarget, cmd.args.compressedImage.level,
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                                      cmd.args.compressedImage.glintformat,
                                      cmd.args.compressedImage.w, cmd.args.compressedImage.h, 0,
                                      cmd.args.compressedImage.size, cmd.args.compressedImage.data);
            break;
        case QGles2CommandBuffer::Command::CompressedSubImage:
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            f->glBindTexture(cmd.args.compressedSubImage.dst->target, cmd.args.compressedSubImage.dst->texture);
            f->glCompressedTexSubImage2D(cmd.args.compressedSubImage.faceTarget, cmd.args.compressedSubImage.level,
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                                         cmd.args.compressedSubImage.dx, cmd.args.compressedSubImage.dy,
                                         cmd.args.compressedSubImage.w, cmd.args.compressedSubImage.h,
                                         cmd.args.compressedSubImage.glintformat,
                                         cmd.args.compressedSubImage.size, cmd.args.compressedSubImage.data);
            break;
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        case QGles2CommandBuffer::Command::BlitFromRenderbuffer:
        {
            GLuint fbo[2];
            f->glGenFramebuffers(2, fbo);
            f->glBindFramebuffer(GL_READ_FRAMEBUFFER, fbo[0]);
            f->glFramebufferRenderbuffer(GL_READ_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
                                         GL_RENDERBUFFER, cmd.args.blitFromRb.renderbuffer);
            f->glBindFramebuffer(GL_DRAW_FRAMEBUFFER, fbo[1]);
            QGles2Texture *texD = cmd.args.blitFromRb.dst;
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            const GLenum faceTargetBase = texD->m_flags.testFlag(QRhiTexture::CubeMap) ? GL_TEXTURE_CUBE_MAP_POSITIVE_X : texD->target;
            f->glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, faceTargetBase + cmd.args.blitFromRb.dstLayer,
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                                      texD->texture, cmd.args.blitFromRb.dstLevel);
            f->glBlitFramebuffer(0, 0, cmd.args.blitFromRb.w, cmd.args.blitFromRb.h,
                                 0, 0, cmd.args.blitFromRb.w, cmd.args.blitFromRb.h,
                                 GL_COLOR_BUFFER_BIT,
                                 GL_LINEAR);
            f->glBindFramebuffer(GL_FRAMEBUFFER, ctx->defaultFramebufferObject());
        }
            break;
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        case QGles2CommandBuffer::Command::GenMip:
            f->glBindTexture(cmd.args.genMip.tex->target, cmd.args.genMip.tex->texture);
            f->glGenerateMipmap(cmd.args.genMip.tex->target);
            break;
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        default:
            break;
        }
    }
}

void QRhiGles2::executeBindGraphicsPipeline(QRhiGraphicsPipeline *ps, QRhiShaderResourceBindings *srb)
{
    QGles2GraphicsPipeline *psD = QRHI_RES(QGles2GraphicsPipeline, ps);

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    if (psD->m_flags.testFlag(QRhiGraphicsPipeline::UsesScissor))
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        f->glEnable(GL_SCISSOR_TEST);
    else
        f->glDisable(GL_SCISSOR_TEST);
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    if (psD->m_cullMode == QRhiGraphicsPipeline::None) {
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        f->glDisable(GL_CULL_FACE);
    } else {
        f->glEnable(GL_CULL_FACE);
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        f->glCullFace(toGlCullMode(psD->m_cullMode));
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    }
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    f->glFrontFace(toGlFrontFace(psD->m_frontFace));
    if (!psD->m_targetBlends.isEmpty()) {
        const QRhiGraphicsPipeline::TargetBlend &blend(psD->m_targetBlends.first()); // no MRT
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        GLboolean wr = blend.colorWrite.testFlag(QRhiGraphicsPipeline::R);
        GLboolean wg = blend.colorWrite.testFlag(QRhiGraphicsPipeline::G);
        GLboolean wb = blend.colorWrite.testFlag(QRhiGraphicsPipeline::B);
        GLboolean wa = blend.colorWrite.testFlag(QRhiGraphicsPipeline::A);
        f->glColorMask(wr, wg, wb, wa);
        if (blend.enable) {
            f->glEnable(GL_BLEND);
            f->glBlendFuncSeparate(toGlBlendFactor(blend.srcColor),
                                   toGlBlendFactor(blend.dstColor),
                                   toGlBlendFactor(blend.srcAlpha),
                                   toGlBlendFactor(blend.dstAlpha));
            f->glBlendEquationSeparate(toGlBlendOp(blend.opColor), toGlBlendOp(blend.opAlpha));
        } else {
            f->glDisable(GL_BLEND);
        }
    } else {
        f->glDisable(GL_BLEND);
    }
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    if (psD->m_depthTest)
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        f->glEnable(GL_DEPTH_TEST);
    else
        f->glDisable(GL_DEPTH_TEST);
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    if (psD->m_depthWrite)
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        f->glDepthMask(GL_TRUE);
    else
        f->glDepthMask(GL_FALSE);
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    f->glDepthFunc(toGlCompareOp(psD->m_depthOp));
    if (psD->m_stencilTest) {
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        f->glEnable(GL_STENCIL_TEST);
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        f->glStencilFuncSeparate(GL_FRONT, toGlCompareOp(psD->m_stencilFront.compareOp), 0, psD->m_stencilReadMask);
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        f->glStencilOpSeparate(GL_FRONT,
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                               toGlStencilOp(psD->m_stencilFront.failOp),
                               toGlStencilOp(psD->m_stencilFront.depthFailOp),
                               toGlStencilOp(psD->m_stencilFront.passOp));
        f->glStencilMaskSeparate(GL_FRONT, psD->m_stencilWriteMask);
        f->glStencilFuncSeparate(GL_BACK, toGlCompareOp(psD->m_stencilBack.compareOp), 0, psD->m_stencilReadMask);
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        f->glStencilOpSeparate(GL_BACK,
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                               toGlStencilOp(psD->m_stencilBack.failOp),
                               toGlStencilOp(psD->m_stencilBack.depthFailOp),
                               toGlStencilOp(psD->m_stencilBack.passOp));
        f->glStencilMaskSeparate(GL_BACK, psD->m_stencilWriteMask);
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    } else {
        f->glDisable(GL_STENCIL_TEST);
    }

    f->glUseProgram(psD->program);
    // buffer data cannot change within the pass so this time is as good to update uniforms as any
    setChangedUniforms(psD, srb, false);
}

void QRhiGles2::setChangedUniforms(QGles2GraphicsPipeline *psD, QRhiShaderResourceBindings *srb, bool changedOnly)
{
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    QGles2ShaderResourceBindings *srbD = QRHI_RES(QGles2ShaderResourceBindings, srb);
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    for (int i = 0, ie = srbD->m_bindings.count(); i != ie; ++i) {
        const QRhiShaderResourceBinding &b(srbD->m_bindings[i]);
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        QGles2ShaderResourceBindings::BoundResourceData &bd(srbD->boundResourceData[i]);

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        switch (b.type) {
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        case QRhiShaderResourceBinding::UniformBuffer:
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        {
            QGles2Buffer *bufD = QRHI_RES(QGles2Buffer, b.ubuf.buf);
            if (changedOnly && bufD->ubufChangeRange.isNull()) // do not set again when nothing changed
                break;
            const QByteArray bufView = QByteArray::fromRawData(bufD->ubuf.constData() + b.ubuf.offset,
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                                                               b.ubuf.maybeSize ? b.ubuf.maybeSize : bufD->m_size);
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            for (QGles2GraphicsPipeline::Uniform &uniform : psD->uniforms) {
                if (uniform.binding == b.binding
                        && (!changedOnly ||
                            (uniform.offset >= uint(bufD->ubufChangeRange.changeBegin)
                             && uniform.offset < uint(bufD->ubufChangeRange.changeEnd))))
                {
                    memcpy(uniform.data.data(), bufView.constData() + uniform.offset, uniform.data.size());

                    switch (uniform.type) {
                    case QShaderDescription::Float:
                        f->glUniform1f(uniform.glslLocation, *reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec2:
                        f->glUniform2fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec3:
                        f->glUniform3fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Vec4:
                        f->glUniform4fv(uniform.glslLocation, 1, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat2:
                        f->glUniformMatrix2fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat3:
                        f->glUniformMatrix3fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Mat4:
                        f->glUniformMatrix4fv(uniform.glslLocation, 1, GL_FALSE, reinterpret_cast<const float *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int:
                        f->glUniform1i(uniform.glslLocation, *reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int2:
                        f->glUniform2iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int3:
                        f->glUniform3iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    case QShaderDescription::Int4:
                        f->glUniform4iv(uniform.glslLocation, 1, reinterpret_cast<const qint32 *>(uniform.data.constData()));
                        break;
                    // ### more types
                    default:
                        break;
                    }
                }
            }

            bufD->ubufChangeRange = QGles2Buffer::ChangeRange();
        }
            break;
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        case QRhiShaderResourceBinding::SampledTexture:
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        {
            QGles2Texture *texD = QRHI_RES(QGles2Texture, b.stex.tex);
            QGles2Sampler *samplerD = QRHI_RES(QGles2Sampler, b.stex.sampler);

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            const bool textureChanged = QRHI_RES(QGles2Texture, b.stex.tex)->generation != bd.stex.texGeneration;
            if (textureChanged)
                bd.stex.texGeneration = QRHI_RES(QGles2Texture, b.stex.tex)->generation;
            const bool samplerChanged = QRHI_RES(QGles2Sampler, b.stex.sampler)->generation != bd.stex.samplerGeneration;
            if (samplerChanged)
                bd.stex.samplerGeneration = QRHI_RES(QGles2Sampler, b.stex.sampler)->generation;

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            int texUnit = 0;
            for (QGles2GraphicsPipeline::Sampler &sampler : psD->samplers) {
                if (sampler.binding == b.binding) {
                    f->glActiveTexture(GL_TEXTURE0 + texUnit);
                    f->glBindTexture(texD->target, texD->texture);

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                    if (textureChanged || samplerChanged) {
                        f->glTexParameteri(texD->target, GL_TEXTURE_MIN_FILTER, samplerD->glminfilter);
                        f->glTexParameteri(texD->target, GL_TEXTURE_MAG_FILTER, samplerD->glmagfilter);
                        f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_S, samplerD->glwraps);
                        f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_T, samplerD->glwrapt);
                        f->glTexParameteri(texD->target, GL_TEXTURE_WRAP_R, samplerD->glwrapr);
                    }
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                    f->glUniform1i(sampler.glslLocation, texUnit);
                    ++texUnit;
                }
            }
            if (texUnit)
                f->glActiveTexture(GL_TEXTURE0);
        }
            break;
        default:
            Q_UNREACHABLE();
            break;
        }
    }
}

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void QRhiGles2::resourceUpdate(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
{
    Q_ASSERT(inFrame && !inPass);

    enqueueResourceUpdates(cb, resourceUpdates);
}

void QRhiGles2::beginPass(QRhiCommandBuffer *cb,
                          QRhiRenderTarget *rt,
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                          const QRhiColorClearValue &colorClearValue,
                          const QRhiDepthStencilClearValue &depthStencilClearValue,
                          QRhiResourceUpdateBatch *resourceUpdates)
{
    Q_ASSERT(!inPass);

    if (resourceUpdates)
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        enqueueResourceUpdates(cb, resourceUpdates);
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    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
    bool needsColorClear = true;
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    bool needsDsClear = true;
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    QGles2BasicRenderTargetData *rtD = nullptr;
    QGles2CommandBuffer::Command fbCmd;
    fbCmd.cmd = QGles2CommandBuffer::Command::BindFramebuffer;
    switch (rt->type()) {
    case QRhiRenderTarget::RtRef:
        rtD = &QRHI_RES(QGles2ReferenceRenderTarget, rt)->d;
        fbCmd.args.bindFramebuffer.rt = nullptr;
        break;
    case QRhiRenderTarget::RtTexture:
    {
        QGles2TextureRenderTarget *rtTex = QRHI_RES(QGles2TextureRenderTarget, rt);
        rtD = &rtTex->d;
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        needsColorClear = !rtTex->m_flags.testFlag(QRhiTextureRenderTarget::PreserveColorContents);
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        needsDsClear = !rtTex->m_flags.testFlag(QRhiTextureRenderTarget::PreserveDepthStencilContents);
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        fbCmd.args.bindFramebuffer.rt = rtTex;
    }
        break;
    default:
        Q_UNREACHABLE();
        break;
    }
    cbD->commands.append(fbCmd);

    cbD->currentTarget = rt;

    Q_ASSERT(rtD->attCount == 1 || rtD->attCount == 2);
    QGles2CommandBuffer::Command clearCmd;
    clearCmd.cmd = QGles2CommandBuffer::Command::Clear;
    clearCmd.args.clear.mask = 0;
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    if (rtD->attCount > 0 && needsColorClear)
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        clearCmd.args.clear.mask |= GL_COLOR_BUFFER_BIT;
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    if (rtD->attCount > 1 && needsDsClear)
        clearCmd.args.clear.mask |= GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT;
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    memcpy(clearCmd.args.clear.c, &colorClearValue.rgba, sizeof(float) * 4);
    clearCmd.args.clear.d = depthStencilClearValue.d;
    clearCmd.args.clear.s = depthStencilClearValue.s;

    cbD->commands.append(clearCmd);

    inPass = true;
}

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void QRhiGles2::endPass(QRhiCommandBuffer *cb, QRhiResourceUpdateBatch *resourceUpdates)
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{
    Q_ASSERT(inPass);
    inPass = false;

    QGles2CommandBuffer *cbD = QRHI_RES(QGles2CommandBuffer, cb);
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