qwasmgltexturevideobuffer_p.h

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// Copyright (C) 2026 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QWASMGLTEXTUREVIDEOBUFFER_H

#define QWASMGLTEXTUREVIDEOBUFFER_H

#include <QtMultimedia/qvideoframe.h>

#include <QtMultimedia/private/qhwvideobuffer_p.h>

#include <QtGui/rhi/qrhi.h>

#include <QtCore/qsize.h>

#include <QtCore/qthread.h>

#include <QtCore/private/quniquehandle_p.h>

#include <emscripten/val.h>

#include <emscripten/html5.h>

#include <GLES2/gl2.h>

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

QT_BEGIN_NAMESPACE

struct QGlTextureHandleTraits

    using Type = GLuint;

    static Type invalidValue() { return 0; }

    static bool close(Type handle)

        glDeleteTextures(1, &handle);

        return true;

};

using QGlTextureHandle = QUniqueHandle<QGlTextureHandleTraits>;

class QWasmGLTextureVideoBuffer : public QHwVideoBuffer

public:

    explicit QWasmGLTextureVideoBuffer(QGlTextureHandle textureHandle, const QSize &size,

                                       EMSCRIPTEN_WEBGL_CONTEXT_HANDLE glContext, QRhi *rhi);

    QWasmGLTextureVideoBuffer::MapData map(QVideoFrame::MapMode) override;

    void unmap() override;

    quint64 textureHandle(QRhi &, int plane) override;

    // Must return the RHI that owns the WebGL context the texture lives in.

    // Without this, qImageFromVideoFrame() calls qEnsureThreadLocalRhi()

    // which creates a second WebGL context, corrupting the GL state for the

    // QQuick render loop that resumes after toImage() returns.

    QRhi *associatedCurrentThreadRhi() const override

        return (QThread::currentThread() == m_rhiThread) ? m_rhi : nullptr;

private:

    QGlTextureHandle m_glTextureHandle;

    QSize m_size;

    // WebGL context the texture was created in

    EMSCRIPTEN_WEBGL_CONTEXT_HANDLE m_glContext;

    QRhi *m_rhi;

    QThread *m_rhiThread;

};

QT_END_NAMESPACE

#endif // QWASMGLTEXTUREVIDEOBUFFER_H