C++ QOpenGLFunctions::glGetIntegerv方法代码示例

void QSGMaterialShader::compile()
{
    Q_ASSERT_X(!m_program.isLinked(), "QSGSMaterialShader::compile()", "Compile called multiple times!");

    program()->addShaderFromSourceCode(QOpenGLShader::Vertex, vertexShader());
    program()->addShaderFromSourceCode(QOpenGLShader::Fragment, fragmentShader());

    char const *const *attr = attributeNames();
#ifndef QT_NO_DEBUG
    int maxVertexAttribs = 0;
    QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
    funcs->glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &maxVertexAttribs);
    for (int i = 0; attr[i]; ++i) {
        if (i >= maxVertexAttribs) {
            qFatal("List of attribute names is either too long or not null-terminated.\n"
                   "Maximum number of attributes on this hardware is %i.\n"
                   "Vertex shader:\n%s\n"
                   "Fragment shader:\n%s\n",
                   maxVertexAttribs, vertexShader(), fragmentShader());
        }
        if (*attr[i])
            program()->bindAttributeLocation(attr[i], i);
    }
#else
    for (int i = 0; attr[i]; ++i) {
        if (*attr[i])
            program()->bindAttributeLocation(attr[i], i);
    }
#endif

    if (!program()->link()) {
        qWarning("QSGMaterialShader: Shader compilation failed:");
        qWarning() << program()->log();
    }
}

QOpenGLExtensionMatcher::QOpenGLExtensionMatcher()
{
    QOpenGLContext *ctx = QOpenGLContext::currentContext();
    QOpenGLFunctions *funcs = ctx->functions();
    const char *extensionStr = 0;

    if (ctx->isOpenGLES() || ctx->format().majorVersion() < 3)
        extensionStr = reinterpret_cast<const char *>(funcs->glGetString(GL_EXTENSIONS));

    if (extensionStr) {
        QByteArray ba(extensionStr);
        QList<QByteArray> extensions = ba.split(' ');
        m_extensions = extensions.toSet();
    } else {
#ifdef QT_OPENGL_3
        // clear error state
        while (funcs->glGetError()) {}

        if (ctx) {
            qt_glGetStringi glGetStringi = (qt_glGetStringi)ctx->getProcAddress("glGetStringi");

            if (!glGetStringi)
                return;

            GLint numExtensions;
            funcs->glGetIntegerv(GL_NUM_EXTENSIONS, &numExtensions);

            for (int i = 0; i < numExtensions; ++i) {
                const char *str = reinterpret_cast<const char *>(glGetStringi(GL_EXTENSIONS, i));
                m_extensions.insert(str);
            }
        }
#endif // QT_OPENGL_3
    }
}

void ShaderBoldLineGen::set_width(float32 w)
{
	QOpenGLFunctions* ogl = QOpenGLContext::currentContext()->functions();
	GLint viewport[4];
	ogl->glGetIntegerv(GL_VIEWPORT, viewport);
	QSizeF wd(w / float32(viewport[2]), w / float32(viewport[3]));
	prg_.setUniformValue(unif_width_, wd);
}

void TFInteg2DGL::integrate(const float *colormap, int resolution, float basesize, float stepsize)
{
    if (!texFull || resolution != texFull->width())
        newResources(resolution);
    QOpenGLFunctions* f = QOpenGLContext::currentContext()->functions();
    tex1d->setData(QOpenGLTexture::RGBA, QOpenGLTexture::Float32, colormap);
    // framebuffer object
    GLint oFbo, viewport[4], activeTex, oTex;
    newFbo();
    f->glGetIntegerv(GL_FRAMEBUFFER_BINDING, &oFbo);
    f->glBindFramebuffer(GL_FRAMEBUFFER, *fbo);
    f->glClear(GL_COLOR_BUFFER_BIT);
    // viewport
    f->glGetIntegerv(GL_VIEWPORT, viewport);
    f->glViewport(0, 0, resolution, resolution);
    // 1d texture
    f->glGetIntegerv(GL_ACTIVE_TEXTURE, &activeTex);
    f->glActiveTexture(GL_TEXTURE0);
    f->glGetIntegerv(GL_TEXTURE_1D, &oTex);
    f->glBindTexture(GL_TEXTURE_1D, tex1d->textureId());
    // paint
    painter.recreateVAO();
    painter.paint("tf1d", 0, "resolution", resolution, "basesize", basesize, "segLen", stepsize);
    // clean
    f->glActiveTexture(GL_TEXTURE0);
    f->glBindTexture(GL_TEXTURE_1D, oTex);
    f->glActiveTexture(activeTex);

//    std::unique_ptr<GLubyte[]> pixels(new GLubyte [resolution * resolution * 4]);
//    f->glReadPixels(0, 0, resolution, resolution, GL_RGBA, GL_UNSIGNED_BYTE, pixels.get());
//    QImage image(pixels.get(), resolution, resolution, QImage::Format_RGBA8888);
//    static QLabel label;
//    label.resize(resolution, resolution);
//    label.setPixmap(QPixmap::fromImage(image.mirrored()));
//    label.show();

    f->glViewport(viewport[0], viewport[1], viewport[2], viewport[3]);
    f->glBindFramebuffer(GL_FRAMEBUFFER, oFbo);
}

    void bind()
    {
        QOpenGLFunctions *functions = QOpenGLContext::currentContext()->functions();

        QMutexLocker lock(&m_frameMutex);
        if (m_frame.isValid()) {
            if (m_frame.map(QAbstractVideoBuffer::ReadOnly)) {
                QSize textureSize = m_frame.size();

                int stride = m_frame.bytesPerLine();
                switch (m_frame.pixelFormat()) {
                case QVideoFrame::Format_RGB565:
                    stride /= 2;
                    break;
                default:
                    stride /= 4;
                }

                m_width = qreal(m_frame.width()) / stride;
                textureSize.setWidth(stride);

                if (m_textureSize != textureSize) {
                    if (!m_textureSize.isEmpty())
                        functions->glDeleteTextures(1, &m_textureId);
                    functions->glGenTextures(1, &m_textureId);
                    m_textureSize = textureSize;
                }

                GLint dataType = GL_UNSIGNED_BYTE;
                GLint dataFormat = GL_RGBA;

                if (m_frame.pixelFormat() == QVideoFrame::Format_RGB565) {
                    dataType = GL_UNSIGNED_SHORT_5_6_5;
                    dataFormat = GL_RGB;
                }

                GLint previousAlignment;
                functions->glGetIntegerv(GL_UNPACK_ALIGNMENT, &previousAlignment);
                functions->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

                functions->glActiveTexture(GL_TEXTURE0);
                functions->glBindTexture(GL_TEXTURE_2D, m_textureId);
                functions->glTexImage2D(GL_TEXTURE_2D, 0, dataFormat,
                                        m_textureSize.width(), m_textureSize.height(),
                                        0, dataFormat, dataType, m_frame.bits());

                functions->glPixelStorei(GL_UNPACK_ALIGNMENT, previousAlignment);

                functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
                functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
                functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
                functions->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

                m_frame.unmap();
            }
            m_frame = QVideoFrame();
        } else {
            functions->glActiveTexture(GL_TEXTURE0);
            functions->glBindTexture(GL_TEXTURE_2D, m_textureId);
        }
    }

void QSGVideoMaterial_YUV::bind()
{
    QOpenGLFunctions *functions = QOpenGLContext::currentContext()->functions();
    QMutexLocker lock(&m_frameMutex);
    if (m_frame.isValid()) {
        if (m_frame.map(QAbstractVideoBuffer::ReadOnly)) {
            int fw = m_frame.width();
            int fh = m_frame.height();

            // Frame has changed size, recreate textures...
            if (m_textureSize != m_frame.size()) {
                if (!m_textureSize.isEmpty())
                    functions->glDeleteTextures(m_planeCount, m_textureIds);
                functions->glGenTextures(m_planeCount, m_textureIds);
                m_textureSize = m_frame.size();
            }

            GLint previousAlignment;
            functions->glGetIntegerv(GL_UNPACK_ALIGNMENT, &previousAlignment);
            functions->glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

            if (m_format.pixelFormat() == QVideoFrame::Format_NV12
                    || m_format.pixelFormat() == QVideoFrame::Format_NV21) {
                const int y = 0;
                const int uv = 1;

                m_planeWidth[0] = m_planeWidth[1] = qreal(fw) / m_frame.bytesPerLine(y);

                functions->glActiveTexture(GL_TEXTURE1);
                bindTexture(m_textureIds[1], m_frame.bytesPerLine(uv) / 2, fh / 2, m_frame.bits(uv), GL_LUMINANCE_ALPHA);
                functions->glActiveTexture(GL_TEXTURE0); // Finish with 0 as default texture unit
                bindTexture(m_textureIds[0], m_frame.bytesPerLine(y), fh, m_frame.bits(y), GL_LUMINANCE);

            } else { // YUV420P || YV12
                const int y = 0;
                const int u = m_frame.pixelFormat() == QVideoFrame::Format_YUV420P ? 1 : 2;
                const int v = m_frame.pixelFormat() == QVideoFrame::Format_YUV420P ? 2 : 1;

                m_planeWidth[0] = qreal(fw) / m_frame.bytesPerLine(y);
                m_planeWidth[1] = m_planeWidth[2] = qreal(fw) / (2 * m_frame.bytesPerLine(u));

                functions->glActiveTexture(GL_TEXTURE1);
                bindTexture(m_textureIds[1], m_frame.bytesPerLine(u), fh / 2, m_frame.bits(u), GL_LUMINANCE);
                functions->glActiveTexture(GL_TEXTURE2);
                bindTexture(m_textureIds[2], m_frame.bytesPerLine(v), fh / 2, m_frame.bits(v), GL_LUMINANCE);
                functions->glActiveTexture(GL_TEXTURE0); // Finish with 0 as default texture unit
                bindTexture(m_textureIds[0], m_frame.bytesPerLine(y), fh, m_frame.bits(y), GL_LUMINANCE);
            }

            functions->glPixelStorei(GL_UNPACK_ALIGNMENT, previousAlignment);
            m_frame.unmap();
        }

        m_frame = QVideoFrame();
    } else {
        // Go backwards to finish with GL_TEXTURE0
        for (int i = m_planeCount - 1; i >= 0; --i) {
            functions->glActiveTexture(GL_TEXTURE0 + i);
            functions->glBindTexture(GL_TEXTURE_2D, m_textureIds[i]);
        }
    }
}