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kwin/libkwineffects/kwingltexture.cpp
Fredrik Höglund 7a99b8c0ef kwin: Add GLTexture::matrix() 
This method returns a matrix that transforms normalized or un-normalized
texture coordinates, taking the texture target and y-inversion flag into
account.
2013-05-28 16:35:36 +02:00

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/********************************************************************
KWin - the KDE window manager
This file is part of the KDE project.
Copyright (C) 2006-2007 Rivo Laks <rivolaks@hot.ee>
Copyright (C) 2010, 2011 Martin Gräßlin <mgraesslin@kde.org>
Copyright (C) 2012 Philipp Knechtges <philipp-dev@knechtges.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "kwinconfig.h" // KWIN_HAVE_OPENGL
#include "kwinglplatform.h"
#include "kwineffects.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::sNPOTTextureSupported = false;
bool GLTexturePrivate::sFramebufferObjectSupported = false;
bool GLTexturePrivate::sSaturationSupported = false;
bool GLTexturePrivate::sTextureFormatBGRA = false;
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())
{
load(image, target);
}
GLTexture::GLTexture(const QPixmap& pixmap, GLenum target)
: d_ptr(new GLTexturePrivate())
{
load(pixmap, target);
}
GLTexture::GLTexture(const QString& fileName)
: d_ptr(new GLTexturePrivate())
{
load(fileName);
}
GLTexture::GLTexture(int width, int height)
: d_ptr(new GLTexturePrivate())
{
Q_D(GLTexture);
if (NPOTTextureSupported() || (isPowerOfTwo(width) && isPowerOfTwo(height))) {
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 = true;
d->updateMatrix();
glGenTextures(1, &d->m_texture);
bind();
#ifdef KWIN_HAVE_OPENGLES
if (GLTexturePrivate::sTextureFormatBGRA) {
glTexImage2D(d->m_target, 0, GL_BGRA_EXT, width, height, 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, 0);
} else {
glTexImage2D(d->m_target, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
}
#else
glTexImage2D(d->m_target, 0, GL_RGBA8, width, height, 0, GL_BGRA, GL_UNSIGNED_BYTE, 0);
#endif
unbind();
}
}
GLTexture::~GLTexture()
{
}
GLTexture& GLTexture::operator = (const GLTexture& tex)
{
d_ptr = tex.d_ptr;
return *this;
}
GLTexturePrivate::GLTexturePrivate()
{
m_texture = 0;
m_target = 0;
m_filter = GL_NEAREST;
m_wrapMode = GL_REPEAT;
m_yInverted = false;
m_canUseMipmaps = false;
m_markedDirty = false;
m_unnormalizeActive = 0;
m_normalizeActive = 0;
m_vbo = 0;
m_filterChanged = true;
m_wrapModeChanged = false;
}
GLTexturePrivate::~GLTexturePrivate()
{
if (m_vbo != 0) {
delete m_vbo;
}
if (m_texture != 0) {
glDeleteTextures(1, &m_texture);
}
}
void GLTexturePrivate::initStatic()
{
#ifdef KWIN_HAVE_OPENGLES
sNPOTTextureSupported = true;
sFramebufferObjectSupported = true;
sSaturationSupported = true;
sTextureFormatBGRA = hasGLExtension("GL_EXT_texture_format_BGRA8888");
#else
sNPOTTextureSupported = hasGLExtension("GL_ARB_texture_non_power_of_two");
sFramebufferObjectSupported = hasGLExtension("GL_EXT_framebuffer_object");
sSaturationSupported = ((hasGLExtension("GL_ARB_texture_env_crossbar")
&& hasGLExtension("GL_ARB_texture_env_dot3")) || hasGLVersion(1, 4))
&& (glTextureUnitsCount >= 4) && glActiveTexture != NULL;
sTextureFormatBGRA = true;
#endif
}
bool GLTexture::isNull() const
{
Q_D(const GLTexture);
return None == d->m_texture;
}
QSize GLTexture::size() const
{
Q_D(const GLTexture);
return d->m_size;
}
bool GLTexture::load(const QImage& image, GLenum target)
{
// decrease the reference counter for the old texture
d_ptr = new GLTexturePrivate();
Q_D(GLTexture);
if (image.isNull())
return false;
QImage img = image;
d->m_target = target;
#ifndef KWIN_HAVE_OPENGLES
if (d->m_target != GL_TEXTURE_RECTANGLE_ARB) {
#endif
if (!NPOTTextureSupported()
&& (!isPowerOfTwo(image.width()) || !isPowerOfTwo(image.height()))) {
// non-rectangular target requires POT texture
img = img.scaled(nearestPowerOfTwo(image.width()),
nearestPowerOfTwo(image.height()));
}
d->m_scale.setWidth(1.0 / img.width());
d->m_scale.setHeight(1.0 / img.height());
d->m_canUseMipmaps = true;
#ifndef KWIN_HAVE_OPENGLES
} else {
d->m_scale.setWidth(1.0);
d->m_scale.setHeight(1.0);
d->m_canUseMipmaps = false;
}
#endif
d->m_size = img.size();
d->m_yInverted = true;
d->updateMatrix();
img = d->convertToGLFormat(img);
if (isNull()) {
glGenTextures(1, &d->m_texture);
}
bind();
#ifdef KWIN_HAVE_OPENGLES
if (GLTexturePrivate::sTextureFormatBGRA) {
glTexImage2D(d->m_target, 0, GL_BGRA_EXT, img.width(), img.height(), 0, GL_BGRA_EXT, GL_UNSIGNED_BYTE, img.bits());
} else {
glTexImage2D(d->m_target, 0, GL_RGBA, img.width(), img.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
}
#else
glTexImage2D(d->m_target, 0, GL_RGBA8, img.width(), img.height(), 0,
GL_BGRA, GL_UNSIGNED_BYTE, img.bits());
#endif
unbind();
setFilter(GL_LINEAR);
return true;
}
void GLTexture::update(const QImage &image, const QPoint &offset, const QRect &src)
{
if (image.isNull() || isNull())
return;
Q_D(GLTexture);
#ifdef KWIN_HAVE_OPENGLES
static bool s_supportsUnpack = hasGLExtension("GL_EXT_unpack_subimage");
#else
static bool s_supportsUnpack = true;
#endif
int width = image.width();
int height = image.height();
QImage tmpImage;
if (!src.isNull()) {
if (s_supportsUnpack) {
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 = d->convertToGLFormat(tmpImage.isNull() ? image : tmpImage);
bind();
#ifdef KWIN_HAVE_OPENGLES
if (GLTexturePrivate::sTextureFormatBGRA) {
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, img.bits());
} else {
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
}
#else
glTexSubImage2D(d->m_target, 0, offset.x(), offset.y(), width, height, GL_BGRA, GL_UNSIGNED_BYTE, img.bits());
#endif
checkGLError("update texture");
unbind();
setDirty();
if (!src.isNull() && s_supportsUnpack) {
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
}
}
bool GLTexture::load(const QPixmap& pixmap, GLenum target)
{
if (pixmap.isNull())
return false;
return load(pixmap.toImage(), target);
}
bool GLTexture::load(const QString& fileName)
{
if (fileName.isEmpty())
return false;
return load(QImage(fileName));
}
void GLTexture::discard()
{
d_ptr = new GLTexturePrivate();
}
void GLTexturePrivate::bind()
{
#ifdef KWIN_HAVE_OPENGL_1
if (!ShaderManager::instance()->isValid())
glEnable(m_target);
#endif
glBindTexture(m_target, m_texture);
}
void GLTexture::bind()
{
Q_D(GLTexture);
d->bind();
if (d->m_markedDirty) {
d->onDamage();
}
if (d->m_filterChanged) {
if (d->m_filter == GL_LINEAR_MIPMAP_LINEAR) {
// trilinear filtering requested, but is it possible?
if (d->sNPOTTextureSupported
&& d->sFramebufferObjectSupported
&& d->m_canUseMipmaps) {
glTexParameteri(d->m_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(d->m_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glGenerateMipmap(d->m_target);
} else {
// can't use trilinear, so use bilinear
d->m_filter = GL_LINEAR;
glTexParameteri(d->m_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(d->m_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
}
} else if (d->m_filter == GL_LINEAR) {
glTexParameteri(d->m_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(d->m_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
} else {
// if neither trilinear nor bilinear, default to fast filtering
d->m_filter = GL_NEAREST;
glTexParameteri(d->m_target, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(d->m_target, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
}
}
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);
}
}
void GLTexturePrivate::unbind()
{
glBindTexture(m_target, 0);
#ifdef KWIN_HAVE_OPENGL_1
if (!ShaderManager::instance()->isValid())
glDisable(m_target);
#endif
}
void GLTexture::unbind()
{
Q_D(GLTexture);
d->unbind();
}
void GLTexture::render(QRegion region, const QRect& rect, bool hardwareClipping)
{
Q_D(GLTexture);
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())
};
#ifdef KWIN_HAVE_OPENGLES
const float texWidth = 1.0f;
const float texHeight = 1.0f;
#else
const float texWidth = (target() == GL_TEXTURE_RECTANGLE_ARB) ? width() : 1.0f;
const float texHeight = (target() == GL_TEXTURE_RECTANGLE_ARB) ? height() : 1.0f;
#endif
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);
}
QMatrix4x4 translation;
translation.translate(rect.x(), rect.y());
if (ShaderManager::instance()->isShaderBound()) {
GLShader *shader = ShaderManager::instance()->getBoundShader();
shader->setUniform(GLShader::Offset, QVector2D(rect.x(), rect.y()));
shader->setUniform(GLShader::WindowTransformation, translation);
} else {
pushMatrix(translation);
}
d->m_vbo->render(region, GL_TRIANGLE_STRIP, hardwareClipping);
if (ShaderManager::instance()->isShaderBound()) {
GLShader *shader = ShaderManager::instance()->getBoundShader();
shader->setUniform(GLShader::WindowTransformation, QMatrix4x4());
} else {
popMatrix();
}
}
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;
}
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()
{
if (m_filter == GL_LINEAR_MIPMAP_LINEAR && !m_filterChanged) {
glGenerateMipmap(m_target);
}
}
void GLTexture::setDirty()
{
Q_D(GLTexture);
d->m_markedDirty = true;
}
QImage GLTexturePrivate::convertToGLFormat(const QImage& img) const
{
// Copied from Qt's QGLWidget::convertToGLFormat()
QImage res;
if (sTextureFormatBGRA) {
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
res = QImage(img.size(), QImage::Format_ARGB32);
QImage imgARGB32 = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
const int width = img.width();
const int height = img.height();
const uint32_t *p = (const uint32_t*) imgARGB32.scanLine(0);
uint32_t *q = (uint32_t*) res.scanLine(0);
// swizzle
for (int i = 0; i < height; ++i) {
const uint32_t *end = p + width;
while (p < end) {
*q = ((*p << 24) & 0xff000000)
| ((*p >> 24) & 0x000000ff)
| ((*p << 8) & 0x00ff0000)
| ((*p >> 8) & 0x0000ff00);
p++;
q++;
}
}
} else if (img.format() != QImage::Format_ARGB32_Premultiplied) {
res = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
} else {
return img;
}
} else {
#ifdef KWIN_HAVE_OPENGLES
res = QImage(img.size(), QImage::Format_ARGB32);
QImage imgARGB32 = img.convertToFormat(QImage::Format_ARGB32_Premultiplied);
const int width = img.width();
const int height = img.height();
const uint32_t *p = (const uint32_t*) imgARGB32.scanLine(0);
uint32_t *q = (uint32_t*) res.scanLine(0);
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
for (int i = 0; i < height; ++i) {
const uint32_t *end = p + width;
while (p < end) {
*q = (*p << 8) | ((*p >> 24) & 0xFF);
p++;
q++;
}
}
} else {
// GL_BGRA -> GL_RGBA
for (int i = 0; i < height; ++i) {
const uint32_t *end = p + width;
while (p < end) {
*q = ((*p << 16) & 0xff0000) | ((*p >> 16) & 0xff) | (*p & 0xff00ff00);
p++;
q++;
}
}
}
#endif
}
return res;
}
void GLTexturePrivate::updateMatrix()
{
m_matrix[NormalizedCoordinates].setToIdentity();
m_matrix[UnnormalizedCoordinates].setToIdentity();
#ifndef KWIN_HAVE_OPENGLES
if (m_target == GL_TEXTURE_RECTANGLE_ARB)
m_matrix[NormalizedCoordinates].scale(m_size.width(), m_size.height());
else
#endif
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);
d->m_yInverted = inverted;
d->updateMatrix();
}
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::NPOTTextureSupported()
{
return GLTexturePrivate::sNPOTTextureSupported;
}
bool GLTexture::framebufferObjectSupported()
{
return GLTexturePrivate::sFramebufferObjectSupported;
}
bool GLTexture::saturationSupported()
{
return GLTexturePrivate::sSaturationSupported;
}
} // namespace KWin
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