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kwin/libkwineffects/kwingltexture.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2006-2007 Rivo Laks <rivolaks@hot.ee>
SPDX-FileCopyrightText: 2010, 2011 Martin Gräßlin <mgraesslin@kde.org>
SPDX-FileCopyrightText: 2012 Philipp Knechtges <philipp-dev@knechtges.com>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "kwinconfig.h" // KWIN_HAVE_OPENGL
#include "kwinglplatform.h"
#include "kwinglutils_funcs.h"
#include "kwinglutils.h"
#include "kwingltexture_p.h"
#include <QPixmap>
#include <QImage>
#include <QVector2D>
#include <QVector3D>
#include <QVector4D>
#include <QMatrix4x4>
namespace KWin
{
//****************************************
// GLTexture
//****************************************
bool GLTexturePrivate::s_supportsFramebufferObjects = false;
bool GLTexturePrivate::s_supportsARGB32 = false;
bool GLTexturePrivate::s_supportsUnpack = false;
bool GLTexturePrivate::s_supportsTextureStorage = false;
bool GLTexturePrivate::s_supportsTextureSwizzle = false;
bool GLTexturePrivate::s_supportsTextureFormatRG = false;
uint GLTexturePrivate::s_textureObjectCounter = 0;
uint GLTexturePrivate::s_fbo = 0;
GLTexture::GLTexture()
: d_ptr(new GLTexturePrivate())
{
}
GLTexture::GLTexture(GLTexturePrivate& dd)
: d_ptr(&dd)
{
}
GLTexture::GLTexture(const GLTexture& tex)
: d_ptr(tex.d_ptr)
{
}
GLTexture::GLTexture(const QImage& image, GLenum target)
: d_ptr(new GLTexturePrivate())
{
Q_D(GLTexture);
if (image.isNull())
return;
d->m_target = target;
if (d->m_target != GL_TEXTURE_RECTANGLE_ARB) {
d->m_scale.setWidth(1.0 / image.width());
d->m_scale.setHeight(1.0 / image.height());
} else {
d->m_scale.setWidth(1.0);
d->m_scale.setHeight(1.0);
}
d->m_size = image.size();
d->m_yInverted = true;
d->m_canUseMipmaps = false;
d->m_mipLevels = 1;
d->updateMatrix();
glGenTextures(1, &d->m_texture);
bind();
if (!GLPlatform::instance()->isGLES()) {
// Note: Blending is set up to expect premultiplied data, so non-premultiplied
// formats must always be converted.
struct {
GLenum internalFormat;
GLenum format;
GLenum type;
} static const table[] = {
{ 0, 0, 0 }, // QImage::Format_Invalid
{ 0, 0, 0 }, // QImage::Format_Mono
{ 0, 0, 0 }, // QImage::Format_MonoLSB
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE }, // QImage::Format_Indexed8
{ GL_RGB8, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV }, // QImage::Format_RGB32
{ 0, 0, 0 }, // QImage::Format_ARGB32
{ GL_RGBA8, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV }, // QImage::Format_ARGB32_Premultiplied
{ GL_RGB8, GL_BGR, GL_UNSIGNED_SHORT_5_6_5_REV }, // QImage::Format_RGB16
{ 0, 0, 0 }, // QImage::Format_ARGB8565_Premultiplied
{ 0, 0, 0 }, // QImage::Format_RGB666
{ 0, 0, 0 }, // QImage::Format_ARGB6666_Premultiplied
{ GL_RGB5, GL_BGRA, GL_UNSIGNED_SHORT_1_5_5_5_REV }, // QImage::Format_RGB555
{ 0, 0, 0 }, // QImage::Format_ARGB8555_Premultiplied
{ GL_RGB8, GL_RGB, GL_UNSIGNED_BYTE }, // QImage::Format_RGB888
{ GL_RGB4, GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4_REV }, // QImage::Format_RGB444
{ GL_RGBA4, GL_BGRA, GL_UNSIGNED_SHORT_4_4_4_4_REV }, // QImage::Format_ARGB4444_Premultiplied
{ GL_RGB8, GL_RGBA, GL_UNSIGNED_BYTE }, // QImage::Format_RGBX8888
{ 0, 0, 0 }, // QImage::Format_RGBA8888
{ GL_RGBA8, GL_RGBA, GL_UNSIGNED_BYTE }, // QImage::Format_RGBA8888_Premultiplied
{ GL_RGB10, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV }, // QImage::Format_BGR30
{ GL_RGB10_A2, GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV }, // QImage::Format_A2BGR30_Premultiplied
{ GL_RGB10, GL_BGRA, GL_UNSIGNED_INT_2_10_10_10_REV }, // QImage::Format_RGB30
{ GL_RGB10_A2, GL_BGRA, GL_UNSIGNED_INT_2_10_10_10_REV }, // QImage::Format_A2RGB30_Premultiplied
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE }, // QImage::Format_Alpha8
{ GL_R8, GL_RED, GL_UNSIGNED_BYTE }, // QImage::Format_Grayscale8
};
QImage im;
GLenum internalFormat;
GLenum format;
GLenum type;
const QImage::Format index = image.format();
if (index < sizeof(table) / sizeof(table[0]) && table[index].internalFormat &&
!(index == QImage::Format_Indexed8 && image.colorCount() > 0)) {
internalFormat = table[index].internalFormat;
format = table[index].format;
type = table[index].type;
im = image;
} else {
im = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
internalFormat = GL_RGBA8;
format = GL_BGRA;
type = GL_UNSIGNED_INT_8_8_8_8_REV;
}
d->m_internalFormat = internalFormat;
if (d->s_supportsTextureStorage) {
glTexStorage2D(d->m_target, 1, internalFormat, im.width(), im.height());
glTexSubImage2D(d->m_target, 0, 0, 0, im.width(), im.height(),
format, type, im.bits());
d->m_immutable = true;
} else {
glTexParameteri(d->m_target, GL_TEXTURE_MAX_LEVEL, d->m_mipLevels - 1);
glTexImage2D(d->m_target, 0, internalFormat, im.width(), im.height(), 0,
format, type, im.bits());
}
} else {
d->m_internalFormat = GL_RGBA8;
if (d->s_supportsARGB32) {
const QImage im = image.convertToFormat(QImage::Format_ARGB32_Premultiplied);
glTexImage2D(d->m_target, 0, GL_BGRA_EXT, im.width(), im.height(),
0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, im.bits());
} else {
const QImage im = image.convertToFormat(QImage::Format_RGBA8888_Premultiplied);
glTexImage2D(d->m_target, 0, GL_RGBA, im.width(), im.height(),
0, GL_RGBA, GL_UNSIGNED_BYTE, im.bits());
}
}
unbind();
setFilter(GL_LINEAR);
}
GLTexture::GLTexture(const QPixmap& pixmap, GLenum target)
: GLTexture(pixmap.toImage(), target)
{
}
GLTexture::GLTexture(const QString& fileName)
: GLTexture(QImage(fileName))
{
}
GLTexture::GLTexture(GLenum internalFormat, int width, int height, int levels, bool needsMutability)
: d_ptr(new GLTexturePrivate())
{
Q_D(GLTexture);
d->m_target = GL_TEXTURE_2D;
d->m_scale.setWidth(1.0 / width);
d->m_scale.setHeight(1.0 / height);
d->m_size = QSize(width, height);
d->m_canUseMipmaps = levels > 1;
d->m_mipLevels = levels;
d->m_filter = levels > 1 ? GL_NEAREST_MIPMAP_LINEAR : GL_NEAREST;
d->updateMatrix();
glGenTextures(1, &d->m_texture);
bind();
if (!GLPlatform::instance()->isGLES()) {
if (d->s_supportsTextureStorage && !needsMutability) {
glTexStorage2D(d->m_target, levels, internalFormat, width, height);
d->m_immutable = true;
} else {
glTexParameteri(d->m_target, GL_TEXTURE_MAX_LEVEL, levels - 1);
glTexImage2D(d->m_target, 0, internalFormat, width, height, 0,
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, nullptr);
}
d->m_internalFormat = internalFormat;
} else {
// The format parameter in glTexSubImage() must match the internal format
// of the texture, so it's important that we allocate the texture with
// the format that will be used in update() and clear().
const GLenum format = d->s_supportsARGB32 ? GL_BGRA_EXT : GL_RGBA;
glTexImage2D(d->m_target, 0, format, width, height, 0,
format, GL_UNSIGNED_BYTE, nullptr);
// This is technically not true, but it means that code that calls
// internalFormat() won't need to be specialized for GLES2.
d->m_internalFormat = GL_RGBA8;
}
unbind();
}
GLTexture::GLTexture(GLenum internalFormat, const QSize &size, int levels, bool needsMutability)
: GLTexture(internalFormat, size.width(), size.height(), levels, needsMutability)
{
}
GLTexture::GLTexture(GLuint textureId, GLenum internalFormat, const QSize &size, int levels)
: d_ptr(new GLTexturePrivate())
{
Q_D(GLTexture);
d->m_foreign = true;
d->m_texture = textureId;
d->m_target = GL_TEXTURE_2D;
d->m_scale.setWidth(1.0 / size.width());
d->m_scale.setHeight(1.0 / size.height());
d->m_size = size;
d->m_canUseMipmaps = levels > 1;
d->m_mipLevels = levels;
d->m_filter = levels > 1 ? GL_NEAREST_MIPMAP_LINEAR : GL_NEAREST;
d->m_internalFormat = internalFormat;
d->updateMatrix();
}
GLTexture::~GLTexture()
{
}
GLTexture& GLTexture::operator = (const GLTexture& tex)
{
d_ptr = tex.d_ptr;
return *this;
}
GLTexturePrivate::GLTexturePrivate()
: m_texture(0)
, m_target(0)
, m_internalFormat(0)
, m_filter(GL_NEAREST)
, m_wrapMode(GL_REPEAT)
, m_yInverted(false)
, m_canUseMipmaps(false)
, m_markedDirty(false)
, m_filterChanged(true)
, m_wrapModeChanged(false)
, m_immutable(false)
, m_foreign(false)
, m_mipLevels(1)
, m_unnormalizeActive(0)
, m_normalizeActive(0)
, m_vbo(nullptr)
{
++s_textureObjectCounter;
}
GLTexturePrivate::~GLTexturePrivate()
{
delete m_vbo;
if (m_texture != 0 && !m_foreign) {
glDeleteTextures(1, &m_texture);
}
// Delete the FBO if this is the last Texture
if (--s_textureObjectCounter == 0 && s_fbo) {
glDeleteFramebuffers(1, &s_fbo);
s_fbo = 0;
}
}
void GLTexturePrivate::initStatic()
{
if (!GLPlatform::instance()->isGLES()) {
s_supportsFramebufferObjects = hasGLVersion(3, 0) ||
hasGLExtension("GL_ARB_framebuffer_object") || hasGLExtension(QByteArrayLiteral("GL_EXT_framebuffer_object"));
s_supportsTextureStorage = hasGLVersion(4, 2) || hasGLExtension(QByteArrayLiteral("GL_ARB_texture_storage"));
s_supportsTextureSwizzle = hasGLVersion(3, 3) || hasGLExtension(QByteArrayLiteral("GL_ARB_texture_swizzle"));
// see https://www.opengl.org/registry/specs/ARB/texture_rg.txt
s_supportsTextureFormatRG = hasGLVersion(3, 0) || hasGLExtension(QByteArrayLiteral("GL_ARB_texture_rg"));
s_supportsARGB32 = true;
s_supportsUnpack = true;
} else {
s_supportsFramebufferObjects = true;
s_supportsTextureStorage = hasGLVersion(3, 0) || hasGLExtension(QByteArrayLiteral("GL_EXT_texture_storage"));
s_supportsTextureSwizzle = hasGLVersion(3, 0);
// see https://www.khronos.org/registry/gles/extensions/EXT/EXT_texture_rg.txt
s_supportsTextureFormatRG = hasGLVersion(3, 0) || hasGLExtension(QByteArrayLiteral("GL_EXT_texture_rg"));
// QImage::Format_ARGB32_Premultiplied is a packed-pixel format, so it's only
// equivalent to GL_BGRA/GL_UNSIGNED_BYTE on little-endian systems.
s_supportsARGB32 = QSysInfo::ByteOrder == QSysInfo::LittleEndian &&
hasGLExtension(QByteArrayLiteral("GL_EXT_texture_format_BGRA8888"));
s_supportsUnpack = hasGLExtension(QByteArrayLiteral("GL_EXT_unpack_subimage"));
}
}
void GLTexturePrivate::cleanup()
{
s_supportsFramebufferObjects = false;
s_supportsARGB32 = false;
}
bool GLTexture::isNull() const
{
Q_D(const GLTexture);
return GL_NONE == d->m_texture;
}
QSize GLTexture::size() const
{
Q_D(const GLTexture);
return d->m_size;
}
void GLTexture::update(const QImage &image, const QPoint &offset, const QRect &src)
{
if (image.isNull() || isNull())
return;
Q_D(GLTexture);
Q_ASSERT(!d->m_foreign);
bool useUnpack = !src.isNull() && d->s_supportsUnpack && d->s_supportsARGB32 && image.format() == QImage::Format_ARGB32_Premultiplied;
int width = image.width();
int height = image.height();
QImage tmpImage;
if (!src.isNull()) {
if (useUnpack) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, image.width());
glPixelStorei(GL_UNPACK_SKIP_PIXELS, src.x());
glPixelStorei(GL_UNPACK_SKIP_ROWS, src.y());
} else {
tmpImage = image.copy(src);
}
width = src.width();
height = src.height();
}
const QImage &img = tmpImage.isNull() ? image : tmpImage;
bind();
if (!GLPlatform::instance()->isGLES()) {
const QImage im = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height,
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, im.bits());
} else {
if (d->s_supportsARGB32) {
const QImage im = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height,
GL_BGRA_EXT, GL_UNSIGNED_BYTE, im.bits());
} else {
const QImage im = img.convertToFormat(QImage::Format_RGBA8888_Premultiplied);
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height,
GL_RGBA, GL_UNSIGNED_BYTE, im.bits());
}
}
unbind();
if (useUnpack) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
}
}
void GLTexture::discard()
{
d_ptr = new GLTexturePrivate();
}
void GLTexture::bind()
{
Q_D(GLTexture);
glBindTexture(d->m_target, d->m_texture);
if (d->m_markedDirty) {
d->onDamage();
}
if (d->m_filterChanged) {
GLenum minFilter = GL_NEAREST;
GLenum magFilter = GL_NEAREST;
switch (d->m_filter) {
case GL_NEAREST:
minFilter = magFilter = GL_NEAREST;
break;
case GL_LINEAR:
minFilter = magFilter = GL_LINEAR;
break;
case GL_NEAREST_MIPMAP_NEAREST:
case GL_NEAREST_MIPMAP_LINEAR:
magFilter = GL_NEAREST;
minFilter = d->m_canUseMipmaps ? d->m_filter : GL_NEAREST;
break;
case GL_LINEAR_MIPMAP_NEAREST:
case GL_LINEAR_MIPMAP_LINEAR:
magFilter = GL_LINEAR;
minFilter = d->m_canUseMipmaps ? d->m_filter : GL_LINEAR;
break;
}
glTexParameteri(d->m_target, GL_TEXTURE_MIN_FILTER, minFilter);
glTexParameteri(d->m_target, GL_TEXTURE_MAG_FILTER, magFilter);
d->m_filterChanged = false;
}
if (d->m_wrapModeChanged) {
glTexParameteri(d->m_target, GL_TEXTURE_WRAP_S, d->m_wrapMode);
glTexParameteri(d->m_target, GL_TEXTURE_WRAP_T, d->m_wrapMode);
d->m_wrapModeChanged = false;
}
}
void GLTexture::generateMipmaps()
{
Q_D(GLTexture);
if (d->m_canUseMipmaps && d->s_supportsFramebufferObjects)
glGenerateMipmap(d->m_target);
}
void GLTexture::unbind()
{
Q_D(GLTexture);
glBindTexture(d->m_target, 0);
}
void GLTexture::render(const QRegion &region, const QRect& rect, bool hardwareClipping)
{
Q_D(GLTexture);
if (rect.isEmpty())
return; // nothing to paint and m_vbo is likely nullptr and d->m_cachedSize empty as well, #337090
if (rect.size() != d->m_cachedSize) {
d->m_cachedSize = rect.size();
QRect r(rect);
r.moveTo(0, 0);
if (!d->m_vbo) {
d->m_vbo = new GLVertexBuffer(KWin::GLVertexBuffer::Static);
}
const float verts[ 4 * 2 ] = {
// NOTICE: r.x/y could be replaced by "0", but that would make it unreadable...
static_cast<float>(r.x()), static_cast<float>(r.y()),
static_cast<float>(r.x()), static_cast<float>(r.y() + rect.height()),
static_cast<float>(r.x() + rect.width()), static_cast<float>(r.y()),
static_cast<float>(r.x() + rect.width()), static_cast<float>(r.y() + rect.height())
};
const float texWidth = (target() == GL_TEXTURE_RECTANGLE_ARB) ? width() : 1.0f;
const float texHeight = (target() == GL_TEXTURE_RECTANGLE_ARB) ? height() : 1.0f;
const float texcoords[ 4 * 2 ] = {
0.0f, d->m_yInverted ? 0.0f : texHeight, // y needs to be swapped (normalized coords)
0.0f, d->m_yInverted ? texHeight : 0.0f,
texWidth, d->m_yInverted ? 0.0f : texHeight,
texWidth, d->m_yInverted ? texHeight : 0.0f
};
d->m_vbo->setData(4, 2, verts, texcoords);
}
d->m_vbo->render(region, GL_TRIANGLE_STRIP, hardwareClipping);
}
GLuint GLTexture::texture() const
{
Q_D(const GLTexture);
return d->m_texture;
}
GLenum GLTexture::target() const
{
Q_D(const GLTexture);
return d->m_target;
}
GLenum GLTexture::filter() const
{
Q_D(const GLTexture);
return d->m_filter;
}
GLenum GLTexture::internalFormat() const
{
Q_D(const GLTexture);
return d->m_internalFormat;
}
void GLTexture::clear()
{
Q_D(GLTexture);
Q_ASSERT(!d->m_foreign);
if (!GLTexturePrivate::s_fbo && GLRenderTarget::supported() &&
GLPlatform::instance()->driver() != Driver_Catalyst) // fail. -> bug #323065
glGenFramebuffers(1, &GLTexturePrivate::s_fbo);
if (GLTexturePrivate::s_fbo) {
// Clear the texture
GLuint previousFramebuffer = 0;
glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, reinterpret_cast<GLint *>(&previousFramebuffer));
if (GLTexturePrivate::s_fbo != previousFramebuffer)
glBindFramebuffer(GL_FRAMEBUFFER, GLTexturePrivate::s_fbo);
glClearColor(0, 0, 0, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, d->m_texture, 0);
glClear(GL_COLOR_BUFFER_BIT);
if (GLTexturePrivate::s_fbo != previousFramebuffer)
glBindFramebuffer(GL_FRAMEBUFFER, previousFramebuffer);
} else {
if (const int size = width()*height()) {
uint32_t *buffer = new uint32_t[size];
memset(buffer, 0, size*sizeof(uint32_t));
bind();
if (!GLPlatform::instance()->isGLES()) {
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width(), height(),
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, buffer);
} else {
const GLenum format = d->s_supportsARGB32 ? GL_BGRA_EXT : GL_RGBA;
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width(), height(),
format, GL_UNSIGNED_BYTE, buffer);
}
unbind();
delete[] buffer;
}
}
}
bool GLTexture::isDirty() const
{
Q_D(const GLTexture);
return d->m_markedDirty;
}
void GLTexture::setFilter(GLenum filter)
{
Q_D(GLTexture);
if (filter != d->m_filter) {
d->m_filter = filter;
d->m_filterChanged = true;
}
}
void GLTexture::setWrapMode(GLenum mode)
{
Q_D(GLTexture);
if (mode != d->m_wrapMode) {
d->m_wrapMode = mode;
d->m_wrapModeChanged=true;
}
}
void GLTexturePrivate::onDamage()
{
// No-op
}
void GLTexture::setDirty()
{
Q_D(GLTexture);
d->m_markedDirty = true;
}
void GLTexturePrivate::updateMatrix()
{
m_matrix[NormalizedCoordinates].setToIdentity();
m_matrix[UnnormalizedCoordinates].setToIdentity();
if (m_target == GL_TEXTURE_RECTANGLE_ARB)
m_matrix[NormalizedCoordinates].scale(m_size.width(), m_size.height());
else
m_matrix[UnnormalizedCoordinates].scale(1.0 / m_size.width(), 1.0 / m_size.height());
if (!m_yInverted) {
m_matrix[NormalizedCoordinates].translate(0.0, 1.0);
m_matrix[NormalizedCoordinates].scale(1.0, -1.0);
m_matrix[UnnormalizedCoordinates].translate(0.0, m_size.height());
m_matrix[UnnormalizedCoordinates].scale(1.0, -1.0);
}
}
bool GLTexture::isYInverted() const
{
Q_D(const GLTexture);
return d->m_yInverted;
}
void GLTexture::setYInverted(bool inverted)
{
Q_D(GLTexture);
if (d->m_yInverted == inverted)
return;
d->m_yInverted = inverted;
d->updateMatrix();
}
void GLTexture::setSwizzle(GLenum red, GLenum green, GLenum blue, GLenum alpha)
{
Q_D(GLTexture);
if (!GLPlatform::instance()->isGLES()) {
const GLuint swizzle[] = { red, green, blue, alpha };
glTexParameteriv(d->m_target, GL_TEXTURE_SWIZZLE_RGBA, (const GLint *) swizzle);
} else {
glTexParameteri(d->m_target, GL_TEXTURE_SWIZZLE_R, red);
glTexParameteri(d->m_target, GL_TEXTURE_SWIZZLE_G, green);
glTexParameteri(d->m_target, GL_TEXTURE_SWIZZLE_B, blue);
glTexParameteri(d->m_target, GL_TEXTURE_SWIZZLE_A, alpha);
}
}
int GLTexture::width() const
{
Q_D(const GLTexture);
return d->m_size.width();
}
int GLTexture::height() const
{
Q_D(const GLTexture);
return d->m_size.height();
}
QMatrix4x4 GLTexture::matrix(TextureCoordinateType type) const
{
Q_D(const GLTexture);
return d->m_matrix[type];
}
bool GLTexture::framebufferObjectSupported()
{
return GLTexturePrivate::s_supportsFramebufferObjects;
}
bool GLTexture::supportsSwizzle()
{
return GLTexturePrivate::s_supportsTextureSwizzle;
}
bool GLTexture::supportsFormatRG()
{
return GLTexturePrivate::s_supportsTextureFormatRG;
}
QImage GLTexture::toImage() const
{
QImage ret(size(), QImage::Format_RGBA8888_Premultiplied);
glGetTextureImage(texture(), 0, GL_RGBA, GL_UNSIGNED_INT_8_8_8_8_REV, ret.sizeInBytes(), ret.bits());
return ret;
}
} // namespace KWin
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