qt-everywhere-src-5.15.1/qtquick3d/src/render/backends/gl/qssgopenglextensions.cpp

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** Copyright (C) 2019 The Qt Company Ltd.
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#include "qssgopenglextensions_p.h"

QT_BEGIN_NAMESPACE

QSSGOpenGLExtensions::QSSGOpenGLExtensions() : QAbstractOpenGLExtension(*(new QSSGOpenGLExtensionsPrivate)) {}

bool QSSGOpenGLExtensions::initializeOpenGLFunctions()
{
    if (isInitialized())
        return true;

    QT_PREPEND_NAMESPACE(QOpenGLContext) *context = QT_PREPEND_NAMESPACE(QOpenGLContext)::currentContext();
    if (!context) {
        qWarning("A current OpenGL context is required to resolve functions");
        return false;
    }

    Q_D(QSSGOpenGLExtensions);

    d->BlendBarrierNV = reinterpret_cast<void(QOPENGLF_APIENTRYP)()>(context->getProcAddress("glBlendBarrierNV"));
    QAbstractOpenGLExtension::initializeOpenGLFunctions();
    return true;
}

#if defined(QT_OPENGL_ES) || defined(QT_OPENGL_ES_2_ANGLE)
QSSGOpenGLES2Extensions::QSSGOpenGLES2Extensions() {}

bool QSSGOpenGLES2Extensions::initializeOpenGLFunctions()
{
    if (isInitialized())
        return true;

    QT_PREPEND_NAMESPACE(QOpenGLContext) *context = QT_PREPEND_NAMESPACE(QOpenGLContext)::currentContext();
    if (!context) {
        qWarning("A current OpenGL context is required to resolve functions");
        return false;
    }

    Q_D(QSSGOpenGLExtensions);

#if defined(QT_OPENGL_ES) || defined(QT_OPENGL_ES_2_ANGLE)
    d->PatchParameteriEXT = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLenum, GLint)>(
            context->getProcAddress("glPatchParameteriEXT"));
    d->QueryCounterEXT = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLuint, GLenum)>(
            context->getProcAddress("glQueryCounterEXT"));
    d->GetQueryObjectui64vEXT = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLuint, GLenum, GLuint64 *)>(
            context->getProcAddress("glGetQueryObjectui64vEXT"));
    d->BindVertexArrayOES = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLuint)>(
            context->getProcAddress("glBindVertexArrayOES"));
    d->DeleteVertexArraysOES = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLsizei, const GLuint *)>(
            context->getProcAddress("glDeleteVertexArraysOES"));
    d->GenVertexArraysOES = reinterpret_cast<void(QOPENGLF_APIENTRYP)(GLsizei, GLuint *)>(
            context->getProcAddress("glGenVertexArraysOES"));
    d->IsVertexArrayOES = reinterpret_cast<GLboolean(QOPENGLF_APIENTRYP)(GLuint)>(
            context->getProcAddress("glIsVertexArrayOES"));
#endif
    QSSGOpenGLExtensions::initializeOpenGLFunctions();
    return true;
}
#endif // QT_OPENGL_ES

QT_END_NAMESPACE