qt-everywhere-src-5.15.1/qtbase/src/plugins/platforms/wasm/qwasmopenglcontext.h

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#include <qpa/qplatformopenglcontext.h>

#include <emscripten.h>
#include <emscripten/html5.h>

QT_BEGIN_NAMESPACE

class QPlatformScreen;
class QWasmOpenGLContext : public QPlatformOpenGLContext
{
public:
    QWasmOpenGLContext(const QSurfaceFormat &format);
    ~QWasmOpenGLContext();

    QSurfaceFormat format() const override;
    void swapBuffers(QPlatformSurface *surface) override;
    GLuint defaultFramebufferObject(QPlatformSurface *surface) const override;
    bool makeCurrent(QPlatformSurface *surface) override;
    void doneCurrent() override;
    bool isSharing() const override;
    bool isValid() const override;
    QFunctionPointer getProcAddress(const char *procName) override;

private:
    static bool isOpenGLVersionSupported(QSurfaceFormat format);
    bool maybeCreateEmscriptenContext(QPlatformSurface *surface);
    static EMSCRIPTEN_WEBGL_CONTEXT_HANDLE createEmscriptenContext(const QString &canvasId, QSurfaceFormat format);

    QSurfaceFormat m_requestedFormat;
    QPlatformScreen *m_screen = nullptr;
    EMSCRIPTEN_WEBGL_CONTEXT_HANDLE m_context = 0;
};

QT_END_NAMESPACE