1 /****************************************************************************
3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
4 ** Contact: http://www.qt-project.org/
6 ** This file is part of the plugins of the Qt Toolkit.
8 ** $QT_BEGIN_LICENSE:LGPL$
9 ** GNU Lesser General Public License Usage
10 ** This file may be used under the terms of the GNU Lesser General Public
11 ** License version 2.1 as published by the Free Software Foundation and
12 ** appearing in the file LICENSE.LGPL included in the packaging of this
13 ** file. Please review the following information to ensure the GNU Lesser
14 ** General Public License version 2.1 requirements will be met:
15 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
17 ** In addition, as a special exception, Nokia gives you certain additional
18 ** rights. These rights are described in the Nokia Qt LGPL Exception
19 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
21 ** GNU General Public License Usage
22 ** Alternatively, this file may be used under the terms of the GNU General
23 ** Public License version 3.0 as published by the Free Software Foundation
24 ** and appearing in the file LICENSE.GPL included in the packaging of this
25 ** file. Please review the following information to ensure the GNU General
26 ** Public License version 3.0 requirements will be met:
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30 ** Alternatively, this file may be used in accordance with the terms and
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40 ****************************************************************************/
42 #include "qeglfsbackingstore.h"
44 #include <QtGui/QOpenGLContext>
45 #include <QtGui/QOpenGLPaintDevice>
46 #include <QtGui/QOpenGLShaderProgram>
48 #include <QtGui/QScreen>
52 QEglFSBackingStore::QEglFSBackingStore(QWindow *window)
53 : QPlatformBackingStore(window)
54 , m_context(new QOpenGLContext)
55 #ifdef EGLFS_BACKINGSTORE_USE_IMAGE
60 m_context->setFormat(window->requestedFormat());
61 m_context->setScreen(window->screen());
65 QEglFSBackingStore::~QEglFSBackingStore()
70 QPaintDevice *QEglFSBackingStore::paintDevice()
72 #ifdef EGLFS_BACKINGSTORE_USE_IMAGE
79 void QEglFSBackingStore::flush(QWindow *window, const QRegion ®ion, const QPoint &offset)
84 #ifdef QEGL_EXTRA_DEBUG
85 qWarning("QEglBackingStore::flush %p", window);
88 #ifdef EGLFS_BACKINGSTORE_USE_IMAGE
90 static const char *textureVertexProgram =
91 "attribute highp vec2 vertexCoordEntry;\n"
92 "attribute highp vec2 textureCoordEntry;\n"
93 "varying highp vec2 textureCoord;\n"
95 " textureCoord = textureCoordEntry;\n"
96 " gl_Position = vec4(vertexCoordEntry, 0.0, 1.0);\n"
99 static const char *textureFragmentProgram =
100 "uniform sampler2D texture;\n"
101 "varying highp vec2 textureCoord;\n"
103 " gl_FragColor = texture2D(texture, textureCoord).bgra;\n"
106 m_program = new QOpenGLShaderProgram;
108 m_program->addShaderFromSourceCode(QOpenGLShader::Vertex, textureVertexProgram);
109 m_program->addShaderFromSourceCode(QOpenGLShader::Fragment, textureFragmentProgram);
112 m_vertexCoordEntry = m_program->attributeLocation("vertexCoordEntry");
113 m_textureCoordEntry = m_program->attributeLocation("textureCoordEntry");
118 const GLfloat textureCoordinates[] = {
125 QRectF r = window->geometry();
126 QRectF sr = window->screen()->geometry();
128 GLfloat x1 = (r.left() / sr.width()) * 2 - 1;
129 GLfloat x2 = (r.right() / sr.width()) * 2 - 1;
130 GLfloat y1 = (r.top() / sr.height()) * 2 - 1;
131 GLfloat y2 = (r.bottom() / sr.height()) * 2 - 1;
133 const GLfloat vertexCoordinates[] = {
140 glEnableVertexAttribArray(m_vertexCoordEntry);
141 glEnableVertexAttribArray(m_textureCoordEntry);
143 glVertexAttribPointer(m_vertexCoordEntry, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinates);
144 glVertexAttribPointer(m_textureCoordEntry, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinates);
146 glBindTexture(GL_TEXTURE_2D, m_texture);
148 if (!m_dirty.isNull()) {
149 QRect imageRect = m_image.rect();
152 foreach (const QRect &rect, m_dirty.rects()) {
153 // intersect with image rect to be sure
154 QRect r = imageRect & rect;
156 // if the rect is wide enough it's cheaper to just
157 // extend it instead of doing an image copy
158 if (r.width() >= imageRect.width() / 2) {
160 r.setWidth(imageRect.width());
166 foreach (const QRect &rect, fixed.rects()) {
167 // if the sub-rect is full-width we can pass the image data directly to
168 // OpenGL instead of copying, since there's no gap between scanlines
169 if (rect.width() == imageRect.width()) {
170 glTexSubImage2D(GL_TEXTURE_2D, 0, 0, rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE, m_image.constScanLine(rect.y()));
172 glTexSubImage2D(GL_TEXTURE_2D, 0, rect.x(), rect.y(), rect.width(), rect.height(), GL_RGBA, GL_UNSIGNED_BYTE,
173 m_image.copy(rect).constBits());
180 glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
182 glBindTexture(GL_TEXTURE_2D, 0);
184 glDisableVertexAttribArray(m_vertexCoordEntry);
185 glDisableVertexAttribArray(m_textureCoordEntry);
188 m_context->swapBuffers(window);
191 void QEglFSBackingStore::makeCurrent()
193 // needed to prevent QOpenGLContext::makeCurrent() from failing
194 window()->setSurfaceType(QSurface::OpenGLSurface);
196 m_context->makeCurrent(window());
199 void QEglFSBackingStore::beginPaint(const QRegion &rgn)
203 #ifdef EGLFS_BACKINGSTORE_USE_IMAGE
204 m_dirty = m_dirty | rgn;
207 m_device = new QOpenGLPaintDevice(window()->size());
211 void QEglFSBackingStore::endPaint()
213 #ifndef EGLFS_BACKINGSTORE_USE_IMAGE
218 void QEglFSBackingStore::resize(const QSize &size, const QRegion &staticContents)
220 Q_UNUSED(staticContents);
222 #ifdef EGLFS_BACKINGSTORE_USE_IMAGE
223 m_image = QImage(size, QImage::Format_RGB32);
226 glDeleteTextures(1, &m_texture);
227 glGenTextures(1, &m_texture);
228 glBindTexture(GL_TEXTURE_2D, m_texture);
229 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
230 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
231 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
232 glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
234 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.width(), size.height(), 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);