qsgatlastexture.cpp 14.3 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458
/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtQuick module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qsgatlastexture_p.h"

#include <QtCore/QVarLengthArray>
#include <QtCore/QElapsedTimer>

#include <QtGui/QOpenGLContext>
#include <QtGui/QGuiApplication>
#include <QtGui/QScreen>
#include <QtGui/QSurface>

#include <private/qsgtexture_p.h>

#include <private/qqmlprofilerservice_p.h>

QT_BEGIN_NAMESPACE

#ifndef GL_BGRA
#define GL_BGRA 0x80E1
#endif


#ifndef QSG_NO_RENDER_TIMING
static bool qsg_render_timing = !qgetenv("QSG_RENDER_TIMING").isEmpty();
static QElapsedTimer qsg_renderer_timer;
#endif

namespace QSGAtlasTexture
{

static inline int qsg_powerOfTwo(int v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    ++v;
    return v;
}

static int qsg_envInt(const char *name, int defaultValue)
{
    QByteArray content = qgetenv(name);

    bool ok = false;
    int value = content.toInt(&ok);
    return ok ? value : defaultValue;
}

Manager::Manager()
    : m_atlas(0)
{
    QOpenGLContext *gl = QOpenGLContext::currentContext();
    Q_ASSERT(gl);
    QSurface *surface = gl->surface();
    QSize surfaceSize = surface->size();
    int max;
    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max);

    int w = qMin(max, qsg_envInt("QSG_ATLAS_WIDTH", qMax(512, qsg_powerOfTwo(surfaceSize.width()))));
    int h = qMin(max, qsg_envInt("QSG_ATLAS_HEIGHT", qMax(512, qsg_powerOfTwo(surfaceSize.height()))));

    m_atlas_size_limit = qsg_envInt("QSG_ATLAS_SIZE_LIMIT", qMax(w, h) / 2);
    m_atlas_size = QSize(w, h);

    if (qEnvironmentVariableIsSet("QSG_INFO"))
        qDebug() << "QSG: texture atlas dimensions:" << w << "x" << h;
}


Manager::~Manager()
{
    Q_ASSERT(m_atlas == 0);
}

void Manager::invalidate()
{
    if (m_atlas) {
        m_atlas->invalidate();
        m_atlas->deleteLater();
        m_atlas = 0;
    }
}

QSGTexture *Manager::create(const QImage &image)
{
    QSGTexture *t = 0;
    if (image.width() < m_atlas_size_limit && image.height() < m_atlas_size_limit) {
        if (!m_atlas)
            m_atlas = new Atlas(m_atlas_size);
        t = m_atlas->create(image);
    }
    return t;
}

Atlas::Atlas(const QSize &size)
    : m_allocator(size)
    , m_texture_id(0)
    , m_size(size)
    , m_filtering(QSGTexture::Linear)
    , m_allocated(false)
{

#ifdef QT_OPENGL_ES
    const char *ext = (const char *) glGetString(GL_EXTENSIONS);
    if (strstr(ext, "GL_EXT_bgra")
            || strstr(ext, "GL_EXT_texture_format_BGRA8888")
            || strstr(ext, "GL_IMG_texture_format_BGRA8888")) {
        m_internalFormat = m_externalFormat = GL_BGRA;
#ifdef Q_OS_IOS
    } else if (strstr(ext, "GL_APPLE_texture_format_BGRA8888")) {
        m_internalFormat = GL_RGBA;
        m_externalFormat = GL_BGRA;
#endif
    } else {
        m_internalFormat = m_externalFormat = GL_RGBA;
    }
#else
    m_internalFormat = GL_RGBA;
    m_externalFormat = GL_BGRA;
#endif

    m_use_bgra_fallback = qEnvironmentVariableIsSet("QSG_ATLAS_USE_BGRA_FALLBACK");
    m_debug_overlay = qEnvironmentVariableIsSet("QSG_ATLAS_OVERLAY");
}

Atlas::~Atlas()
{
    Q_ASSERT(!m_texture_id);
}

void Atlas::invalidate()
{
    Q_ASSERT(QOpenGLContext::currentContext());
    if (m_texture_id) {
        glDeleteTextures(1, &m_texture_id);
        m_texture_id = 0;
    }
}

Texture *Atlas::create(const QImage &image)
{
    // No need to lock, as manager already locked it.
    QRect rect = m_allocator.allocate(QSize(image.width() + 2, image.height() + 2));
    if (rect.width() > 0 && rect.height() > 0) {
        Texture *t = new Texture(this, rect, image);
        m_pending_uploads << t;
        return t;
    }
    return 0;
}


int Atlas::textureId() const
{
    if (!m_texture_id) {
        Q_ASSERT(QOpenGLContext::currentContext());
        glGenTextures(1, &const_cast<Atlas *>(this)->m_texture_id);
    }

    return m_texture_id;
}

static void swizzleBGRAToRGBA(QImage *image)
{
    const int width = image->width();
    const int height = image->height();
    uint *p = (uint *) image->bits();
    int stride = image->bytesPerLine() / 4;
    for (int i = 0; i < height; ++i) {
        for (int x = 0; x < width; ++x)
            p[x] = ((p[x] << 16) & 0xff0000) | ((p[x] >> 16) & 0xff) | (p[x] & 0xff00ff00);
        p += stride;
    }
}

void Atlas::upload(Texture *texture)
{
    const QImage &image = texture->image();
    const QRect &r = texture->atlasSubRect();

    QImage tmp(r.width(), r.height(), QImage::Format_ARGB32_Premultiplied);
    {
        QPainter p(&tmp);
        p.setCompositionMode(QPainter::CompositionMode_Source);

        int w = r.width();
        int h = r.height();
        int iw = image.width();
        int ih = image.height();

        p.drawImage(1, 1, image);
        p.drawImage(1, 0, image, 0, 0, iw, 1);
        p.drawImage(1, h - 1, image, 0, ih - 1, iw, 1);
        p.drawImage(0, 1, image, 0, 0, 1, ih);
        p.drawImage(w - 1, 1, image, iw - 1, 0, 1, ih);
        p.drawImage(0, 0, image, 0, 0, 1, 1);
        p.drawImage(0, h - 1, image, 0, ih - 1, 1, 1);
        p.drawImage(w - 1, 0, image, iw - 1, 0, 1, 1);
        p.drawImage(w - 1, h - 1, image, iw - 1, ih - 1, 1, 1);
        if (m_debug_overlay) {
            p.setCompositionMode(QPainter::CompositionMode_SourceAtop);
            p.fillRect(0, 0, iw, ih, QBrush(QColor::fromRgbF(1, 0, 1, 0.5)));
        }
    }

    if (m_externalFormat == GL_RGBA)
        swizzleBGRAToRGBA(&tmp);
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x(), r.y(), r.width(), r.height(), m_externalFormat, GL_UNSIGNED_BYTE, tmp.constBits());
}

void Atlas::uploadBgra(Texture *texture)
{
    const QRect &r = texture->atlasSubRect();
    QImage image = texture->image();

    if (image.format() != QImage::Format_ARGB32_Premultiplied
            || image.format() != QImage::Format_RGB32) {
        image = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
    }

    if (m_debug_overlay) {
        QPainter p(&image);
        p.setCompositionMode(QPainter::CompositionMode_SourceAtop);
        p.fillRect(0, 0, image.width(), image.height(), QBrush(QColor::fromRgbF(0, 1, 1, 0.5)));
    }

    QVarLengthArray<quint32, 512> tmpBits(qMax(image.width() + 2, image.height() + 2));
    int iw = image.width();
    int ih = image.height();
    int bpl = image.bytesPerLine() / 4;
    const quint32 *src = (const quint32 *) image.constBits();
    quint32 *dst = tmpBits.data();

    // top row, padding corners
    dst[0] = src[0];
    memcpy(dst + 1, src, iw * sizeof(quint32));
    dst[1 + iw] = src[iw-1];
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x(), r.y(), iw + 2, 1, m_externalFormat, GL_UNSIGNED_BYTE, dst);

    // bottom row, padded corners
    const quint32 *lastRow = src + bpl * (ih - 1);
    dst[0] = lastRow[0];
    memcpy(dst + 1, lastRow, iw * sizeof(quint32));
    dst[1 + iw] = lastRow[iw-1];
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x(), r.y() + ih + 1, iw + 2, 1, m_externalFormat, GL_UNSIGNED_BYTE, dst);

    // left column
    for (int i=0; i<ih; ++i)
        dst[i] = src[i * bpl];
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x(), r.y() + 1, 1, ih, m_externalFormat, GL_UNSIGNED_BYTE, dst);

    // right column
    for (int i=0; i<ih; ++i)
        dst[i] = src[i * bpl + iw - 1];
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x() + iw + 1, r.y() + 1, 1, ih, m_externalFormat, GL_UNSIGNED_BYTE, dst);

    // Inner part of the image....
    glTexSubImage2D(GL_TEXTURE_2D, 0, r.x() + 1, r.y() + 1, r.width() - 2, r.height() - 2, m_externalFormat, GL_UNSIGNED_BYTE, src);

}

bool Atlas::bind(QSGTexture::Filtering filtering)
{
    bool forceUpdate = false;
    if (!m_allocated) {
        m_allocated = true;

        while (glGetError() != GL_NO_ERROR) ;

        glGenTextures(1, &m_texture_id);
        glBindTexture(GL_TEXTURE_2D, m_texture_id);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
#if !defined(QT_OPENGL_ES_2)
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0);
#endif
        glTexImage2D(GL_TEXTURE_2D, 0, m_internalFormat, m_size.width(), m_size.height(), 0, m_externalFormat, GL_UNSIGNED_BYTE, 0);

#if 0
        QImage pink(m_size.width(), m_size.height(), QImage::Format_ARGB32_Premultiplied);
        pink.fill(0);
        QPainter p(&pink);
        QLinearGradient redGrad(0, 0, m_size.width(), 0);
        redGrad.setColorAt(0, Qt::black);
        redGrad.setColorAt(1, Qt::red);
        p.fillRect(0, 0, m_size.width(), m_size.height(), redGrad);
        p.setCompositionMode(QPainter::CompositionMode_Plus);
        QLinearGradient blueGrad(0, 0, 0, m_size.height());
        blueGrad.setColorAt(0, Qt::black);
        blueGrad.setColorAt(1, Qt::blue);
        p.fillRect(0, 0, m_size.width(), m_size.height(), blueGrad);
        p.end();

        glTexImage2D(GL_TEXTURE_2D, 0, m_internalFormat, m_size.width(), m_size.height(), 0, m_externalFormat, GL_UNSIGNED_BYTE, pink.constBits());
#endif

        GLenum errorCode = glGetError();
        if (errorCode == GL_OUT_OF_MEMORY) {
            qDebug("QSGTextureAtlas: texture atlas allocation failed, out of memory");
            glDeleteTextures(1, &m_texture_id);
            m_texture_id = 0;
        } else if (errorCode != GL_NO_ERROR) {
            qDebug("QSGTextureAtlas: texture atlas allocation failed, code=%x", errorCode);
            glDeleteTextures(1, &m_texture_id);
            m_texture_id = 0;
        }
        forceUpdate = true;
    } else {
        glBindTexture(GL_TEXTURE_2D, m_texture_id);
    }

    if (m_texture_id == 0)
        return false;

    // Upload all pending images..
    for (int i=0; i<m_pending_uploads.size(); ++i) {

#ifndef QSG_NO_RENDER_TIMING
        bool profileFrames = qsg_render_timing || QQmlProfilerService::enabled;
        if (profileFrames)
            qsg_renderer_timer.start();
#endif

        if (m_externalFormat == GL_BGRA &&
                !m_use_bgra_fallback) {
            uploadBgra(m_pending_uploads.at(i));
        } else {
            upload(m_pending_uploads.at(i));
        }

#ifndef QSG_NO_RENDER_TIMING
        if (qsg_render_timing) {
            qDebug("   - AtlasTexture(%dx%d), uploaded in %d ms",
                   m_pending_uploads.at(i)->image().width(),
                   m_pending_uploads.at(i)->image().height(),
                   (int) (qsg_renderer_timer.elapsed()));
        }

        if (QQmlProfilerService::enabled) {
            QQmlProfilerService::sceneGraphFrame(
                        QQmlProfilerService::SceneGraphTexturePrepare,
                        0,  // bind (not relevant)
                        0,  // convert (not relevant)
                        0,  // swizzle (not relevant)
                        qsg_renderer_timer.nsecsElapsed(), // (upload all of the above)
                        0); // mipmap (not used ever...)
        }
#endif
    }

    if (filtering != m_filtering) {
        GLenum f = filtering == QSGTexture::Nearest ? GL_NEAREST : GL_LINEAR;
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, f);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, f);
        m_filtering = filtering;
    }

    m_pending_uploads.clear();

    return forceUpdate;
}

void Atlas::remove(Texture *t)
{
    QRect atlasRect = t->atlasSubRect();
    m_allocator.deallocate(atlasRect);
    m_pending_uploads.removeOne(t);
}



Texture::Texture(Atlas *atlas, const QRect &textureRect, const QImage &image)
    : QSGTexture()
    , m_allocated_rect(textureRect)
    , m_image(image)
    , m_atlas(atlas)
    , m_nonatlas_texture(0)
{
    m_allocated_rect_without_padding = m_allocated_rect.adjusted(1, 1, -1, -1);
    float w = atlas->size().width();
    float h = atlas->size().height();

    m_texture_coords_rect = QRectF(m_allocated_rect_without_padding.x() / w,
                                   m_allocated_rect_without_padding.y() / h,
                                   m_allocated_rect_without_padding.width() / w,
                                   m_allocated_rect_without_padding.height() / h);
}

Texture::~Texture()
{
    m_atlas->remove(this);
    if (m_nonatlas_texture)
        delete m_nonatlas_texture;
}

void Texture::bind()
{
    m_atlas->bind(filtering());
}

QSGTexture *Texture::removedFromAtlas() const
{
    if (!m_nonatlas_texture) {
        m_nonatlas_texture = new QSGPlainTexture();
        m_nonatlas_texture->setImage(m_image);
        m_nonatlas_texture->setFiltering(filtering());
    }
    return m_nonatlas_texture;
}

}

QT_END_NAMESPACE