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

QWaylandBufferMaterial::~QWaylandBufferMaterial()
{
    QOpenGLFunctions *gl = QOpenGLContext::currentContext()->functions();

    for (GLuint texture : m_textures)
        gl->glDeleteTextures(1, &texture);
}

static void uploadTextures(QOpenGLContext* context, SharedFrame& frame, GLuint texture[])
{
    int width = frame.get_image_width();
    int height = frame.get_image_height();
    const uint8_t* image = frame.get_image();
    QOpenGLFunctions* f = context->functions();

    // Upload each plane of YUV to a texture.
    if (texture[0] && texture[1] && texture[2])
        f->glDeleteTextures(3, texture);
    check_error(f);
    f->glGenTextures(3, texture);
    check_error(f);
    f->glPixelStorei(GL_UNPACK_ROW_LENGTH, width);

    f->glBindTexture  (GL_TEXTURE_2D, texture[0]);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    check_error(f);
    f->glTexImage2D   (GL_TEXTURE_2D, 0, GL_RED, width, height, 0,
                    GL_RED, GL_UNSIGNED_BYTE, image);
    check_error(f);

    f->glBindTexture  (GL_TEXTURE_2D, texture[1]);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    check_error(f);
    int y = context->isOpenGLES() ? 2 : 4;
    f->glTexImage2D   (GL_TEXTURE_2D, 0, GL_RED, width/2, height/y, 0,
                    GL_RED, GL_UNSIGNED_BYTE, image + width * height);
    check_error(f);

    f->glBindTexture  (GL_TEXTURE_2D, texture[2]);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    check_error(f);
    f->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    check_error(f);
    f->glTexImage2D   (GL_TEXTURE_2D, 0, GL_RED, width/2, height/y, 0,
                    GL_RED, GL_UNSIGNED_BYTE, image + width * height + width/2 * height/2);
    check_error(f);
}

void QOpenGL2GradientCache::cleanCache()
{
    QMutexLocker lock(&m_mutex);
    QOpenGLGradientColorTableHash::const_iterator it = cache.constBegin();
    QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
    for (; it != cache.constEnd(); ++it) {
        const CacheInfo &cache_info = it.value();
        funcs->glDeleteTextures(1, &cache_info.texId);
    }
    cache.clear();
}

void SSGTexture::bind()
{
    QOpenGLContext *context = QOpenGLContext::currentContext();
    QOpenGLFunctions *funcs = context->functions();
    if (!m_dirty_texture) {
        funcs->glBindTexture(GL_TEXTURE_2D, m_texture_id);
        if ((minMipmapFiltering() != SSGTexture::None || magMipmapFiltering() != SSGTexture::None) && !m_mipmaps_generated) {
            funcs->glGenerateMipmap(GL_TEXTURE_2D);
            m_mipmaps_generated = true;
        }
        updateBindOptions(m_dirty_bind_options);
        m_dirty_bind_options = false;
        return;
    }

    m_dirty_texture = false;

    if (!m_image || !m_image->isValid()) {
        if (m_texture_id && m_owns_texture) {
            funcs->glDeleteTextures(1, &m_texture_id);
        }
        m_texture_id = 0;
        m_texture_size = QSize();
        m_has_alpha = false;

        return;
    }

    if (m_texture_id == 0)
        funcs->glGenTextures(1, &m_texture_id);
    funcs->glBindTexture(GL_TEXTURE_2D, m_texture_id);

    updateBindOptions(m_dirty_bind_options);

    funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA32F, m_texture_size.width(), m_texture_size.height(), 0, GL_RGBA, GL_UNSIGNED_SHORT, m_image->rawData().get());

    if (minMipmapFiltering() != SSGTexture::None || magMipmapFiltering() != SSGTexture::None) {
        funcs->glGenerateMipmap(GL_TEXTURE_2D);
        m_mipmaps_generated = true;
    }

    m_texture_rect = QRectF(0, 0, 1, 1);

    m_dirty_bind_options = false;
//    if (!m_retain_image)
//        m_image.reset();
}

void QWaylandBufferMaterial::setTextureForPlane(int plane, uint texture)
{
    if (plane < 0 || plane >= bufferTypes[m_format].planeCount) {
        qWarning("plane index is out of range");
        return;
    }

    QOpenGLFunctions *gl = QOpenGLContext::currentContext()->functions();
    const GLenum target = bufferTypes[m_format].textureTarget;

    gl->glBindTexture(target, texture);
    setTextureParameters(target);

    ensureTextures(plane - 1);

    if (m_textures.size() <= plane) {
        m_textures << texture;
    } else {
        std::swap(m_textures[plane], texture);
        gl->glDeleteTextures(1, &texture);
    }
}

GLuint QOpenGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity)
{
    QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
    if (cache.size() == maxCacheSize()) {
        int elem_to_remove = qrand() % maxCacheSize();
        quint64 key = cache.keys()[elem_to_remove];

        // need to call glDeleteTextures on each removed cache entry:
        QOpenGLGradientColorTableHash::const_iterator it = cache.constFind(key);
        do {
            funcs->glDeleteTextures(1, &it.value().texId);
        } while (++it != cache.constEnd() && it.key() == key);
        cache.remove(key); // may remove more than 1, but OK
    }

    CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
    uint buffer[1024];
    generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
    funcs->glGenTextures(1, &cache_entry.texId);
    funcs->glBindTexture(GL_TEXTURE_2D, cache_entry.texId);
    funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1,
                        0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
    return cache.insert(hash_val, cache_entry).value().texId;
}

    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);
        }
    }

//.........这里部分代码省略.........

    {
        static const char *vertexShaderSource =
                "attribute vec4      vertexCoordsArray; \n"
                "attribute vec2      textureCoordArray; \n"
                "varying   vec2      textureCoords;     \n"
                "void main(void) \n"
                "{ \n"
                "    gl_Position = vertexCoordsArray;   \n"
                "    textureCoords = textureCoordArray; \n"
                "} \n";

        static const char *fragmentShaderSource =
                "varying   vec2      textureCoords; \n"
                "uniform   sampler2D         texture;       \n"
                "void main() \n"
                "{ \n"
                "    gl_FragColor = texture2D(texture, textureCoords); \n"
                "} \n";

        GLuint vertexShader = functions->glCreateShader(GL_VERTEX_SHADER);
        GLuint fragmentShader = functions->glCreateShader(GL_FRAGMENT_SHADER);

        if (vertexShader == 0 || fragmentShader == 0) {
            GLenum error = functions->glGetError();
            qWarning("QSGDistanceFieldGlyphCache::saveTexture: Failed to create shaders. (GL error: %x)",
                     error);
            return;
        }

        functions->glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
        functions->glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
        functions->glCompileShader(vertexShader);

        GLint len = 1;
        functions->glGetShaderiv(vertexShader, GL_INFO_LOG_LENGTH, &len);

        char infoLog[2048];
        functions->glGetShaderInfoLog(vertexShader, 2048, NULL, infoLog);
        if (qstrlen(infoLog) > 0)
            qWarning("Problems compiling vertex shader:\n %s", infoLog);

        functions->glCompileShader(fragmentShader);
        functions->glGetShaderInfoLog(fragmentShader, 2048, NULL, infoLog);
        if (qstrlen(infoLog) > 0)
            qWarning("Problems compiling fragment shader:\n %s", infoLog);

        GLuint shaderProgram = functions->glCreateProgram();
        functions->glAttachShader(shaderProgram, vertexShader);
        functions->glAttachShader(shaderProgram, fragmentShader);

        functions->glBindAttribLocation(shaderProgram, 0, "vertexCoordsArray");
        functions->glBindAttribLocation(shaderProgram, 1, "textureCoordArray");

        functions->glLinkProgram(shaderProgram);
        functions->glGetProgramInfoLog(shaderProgram, 2048, NULL, infoLog);
        if (qstrlen(infoLog) > 0)
            qWarning("Problems linking shaders:\n %s", infoLog);

        functions->glUseProgram(shaderProgram);
        functions->glEnableVertexAttribArray(0);
        functions->glEnableVertexAttribArray(1);

        int textureUniformLocation = functions->glGetUniformLocation(shaderProgram, "texture");
        functions->glUniform1i(textureUniformLocation, 0);
    }

    functions->glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    {
        GLenum error = functions->glGetError();
        if (error != GL_NO_ERROR)
            qWarning("glDrawArrays reported error 0x%x", error);
    }

    uchar *data = new uchar[width * height * 4];

    functions->glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);

    QImage image(data, width, height, QImage::Format_ARGB32);

    QByteArray fileName = m_referenceFont.familyName().toLatin1() + '_' + QByteArray::number(textureId);
    fileName = fileName.replace('/', '_').replace(' ', '_') + ".png";

    image.save(QString::fromLocal8Bit(fileName));

    {
        GLenum error = functions->glGetError();
        if (error != GL_NO_ERROR)
            qWarning("glReadPixels reported error 0x%x", error);
    }

    functions->glDisableVertexAttribArray(0);
    functions->glDisableVertexAttribArray(1);

    functions->glDeleteFramebuffers(1, &fboId);
    functions->glDeleteTextures(1, &tmpTexture);

    delete[] data;
}

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]);
        }
    }
}