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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "qopengltextureblitwindow.h"
#include <QtGui/QPainter>
#include <QtOpenGL/QOpenGLTexture>
#include <QtGui/QOpenGLFunctions>
#include <QtGui/QMatrix4x4>
#include <QtCore/QCoreApplication>
#include <QtCore/QDebug>
QOpenGLTextureBlitWindow::QOpenGLTextureBlitWindow()
: QWindow()
, m_context(new QOpenGLContext(this))
{
resize(500,500);
setSurfaceType(OpenGLSurface);
QSurfaceFormat surfaceFormat = format();
if (QCoreApplication::arguments().contains(QStringLiteral("-coreprofile"))) {
surfaceFormat.setVersion(3,2);
surfaceFormat.setProfile(QSurfaceFormat::CoreProfile);
}
setFormat(surfaceFormat);
create();
m_context->setFormat(surfaceFormat);
m_context->create();
m_context->makeCurrent(this);
m_blitter.create();
qDebug("GL_TEXTURE_EXTERNAL_OES support: %d", m_blitter.supportsExternalOESTarget());
}
void QOpenGLTextureBlitWindow::render()
{
m_context->makeCurrent(this);
QRect viewport(0,0,dWidth(),dHeight());
QOpenGLFunctions *functions = m_context->functions();
functions->glViewport(0,0,dWidth(), dHeight());
functions->glClearColor(0.f, .6f, .0f, 0.f);
functions->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
QOpenGLTexture texture(m_image);
texture.setWrapMode(QOpenGLTexture::ClampToEdge);
texture.create();
QOpenGLTexture texture_mirrored(m_image_mirrord);
texture_mirrored.setWrapMode(QOpenGLTexture::ClampToEdge);
texture_mirrored.create();
QRectF topLeftOriginTopLeft(QPointF(0,0), QPointF(dWidth()/2.0, dHeight()/2.0));
QRectF topRightOriginTopLeft(QPointF(dWidth()/2.0,0), QPointF(dWidth(), dHeight()/2.0));
QRectF bottomLeftOriginTopLeft(QPointF(0, dHeight()/2.0), QPointF(dWidth() /2.0, dHeight()));
QRectF bottomRightOriginTopLeft(QPoint(dWidth()/2.0, dHeight()/2.0), QPointF(dWidth(), dHeight()));
QRectF topLeftOriginBottomLeft = bottomLeftOriginTopLeft; Q_UNUSED(topLeftOriginBottomLeft);
QRectF topRightOriginBottomLeft = bottomRightOriginTopLeft; Q_UNUSED(topRightOriginBottomLeft);
QRectF bottomLeftOriginBottomLeft = topLeftOriginTopLeft;
QRectF bottomRightOriginBottomLeft = topRightOriginTopLeft;
QOpenGLTextureBlitter::Origin topLeftOrigin = QOpenGLTextureBlitter::OriginTopLeft;
QOpenGLTextureBlitter::Origin bottomLeftOrigin = QOpenGLTextureBlitter::OriginBottomLeft;
QMatrix4x4 topRightOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(topRightOriginTopLeft, viewport);
QMatrix4x4 bottomLeftOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(bottomLeftOriginTopLeft, viewport);
QMatrix4x4 bottomRightOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(bottomRightOriginTopLeft, viewport);
QMatrix3x3 texTopLeftOriginTopLeft = QOpenGLTextureBlitter::sourceTransform(topLeftOriginTopLeft, m_image.size(), topLeftOrigin);
QMatrix3x3 texTopRightOriginBottomLeft = QOpenGLTextureBlitter::sourceTransform(topRightOriginBottomLeft, m_image.size(), bottomLeftOrigin);
QMatrix3x3 texBottomLeftOriginBottomLeft = QOpenGLTextureBlitter::sourceTransform(bottomLeftOriginBottomLeft, m_image.size(), bottomLeftOrigin);
QMatrix3x3 texBottomRightOriginBottomLeft = QOpenGLTextureBlitter::sourceTransform(bottomRightOriginBottomLeft, m_image.size(), bottomLeftOrigin);
QSizeF subSize(topLeftOriginTopLeft.width()/2, topLeftOriginTopLeft.height()/2);
QRectF subTopLeftOriginTopLeft(topLeftOriginTopLeft.topLeft(), subSize);
QRectF subTopRightOriginTopLeft(QPointF(topLeftOriginTopLeft.topLeft().x() + topLeftOriginTopLeft.width() / 2,
topLeftOriginTopLeft.topLeft().y()), subSize);
QRectF subBottomLeftOriginTopLeft(QPointF(topLeftOriginTopLeft.topLeft().x(),
topLeftOriginTopLeft.topLeft().y() + topLeftOriginTopLeft.height() / 2), subSize);
QRectF subBottomRightOriginTopLeft(QPointF(topLeftOriginTopLeft.topLeft().x() + topLeftOriginTopLeft.width() / 2,
topLeftOriginTopLeft.topLeft().y() + topLeftOriginTopLeft.height() / 2), subSize);
QMatrix4x4 subTopLeftOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(subTopLeftOriginTopLeft, viewport);
QMatrix4x4 subTopRightOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(subTopRightOriginTopLeft, viewport);
QMatrix4x4 subBottomLeftOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(subBottomLeftOriginTopLeft, viewport);
QMatrix4x4 subBottomRightOriginTopLeftVertex = QOpenGLTextureBlitter::targetTransform(subBottomRightOriginTopLeft, viewport);
m_blitter.bind();
m_blitter.blit(texture_mirrored.textureId(), subTopLeftOriginTopLeftVertex, texBottomRightOriginBottomLeft);
m_blitter.blit(texture_mirrored.textureId(), subTopRightOriginTopLeftVertex, texBottomLeftOriginBottomLeft);
m_blitter.blit(texture.textureId(), subBottomLeftOriginTopLeftVertex, texTopRightOriginBottomLeft);
m_blitter.blit(texture.textureId(), subBottomRightOriginTopLeftVertex, texTopLeftOriginTopLeft);
m_blitter.blit(texture.textureId(), topRightOriginTopLeftVertex, topLeftOrigin);
m_blitter.blit(texture_mirrored.textureId(), bottomLeftOriginTopLeftVertex, topLeftOrigin);
m_blitter.setRedBlueSwizzle(true);
m_blitter.blit(texture.textureId(), bottomRightOriginTopLeftVertex, texTopLeftOriginTopLeft);
m_blitter.setRedBlueSwizzle(false);
m_blitter.release();
if (m_blitter.supportsExternalOESTarget()) {
// Cannot do much testing here, just verify that bind and release work, meaning that the program is present.
m_blitter.bind(0x8D65);
m_blitter.release();
}
m_context->swapBuffers(this);
}
void QOpenGLTextureBlitWindow::exposeEvent(QExposeEvent *event)
{
Q_UNUSED(event);
render();
}
void QOpenGLTextureBlitWindow::resizeEvent(QResizeEvent *event)
{
Q_UNUSED(event);
m_image = QImage(size() * devicePixelRatio(), QImage::Format_ARGB32_Premultiplied);
m_image.fill(Qt::gray);
QPainter p(&m_image);
QPen pen(Qt::red);
pen.setWidth(5);
p.setPen(pen);
QFont font = p.font();
font.setPixelSize(qMin(m_image.height(), m_image.width()) / 20);
p.setFont(font);
int dx = dWidth() / 5;
int dy = dHeight() / 5;
for (int y = 0; y < 5; y++) {
for (int x = 0; x < 5; x++) {
QRect textRect(x * dx, y*dy, dx,dy);
QString text = QString("[%1,%2]").arg(x).arg(y);
p.drawText(textRect,text);
}
}
p.drawRect(QRectF(2.5,2.5,dWidth() - 5, dHeight() - 5));
m_image_mirrord = m_image.mirrored(false,true);
}
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