80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
/*
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SPDX-FileCopyrightText: 2022 Vlad Zahorodnii <vlad.zahorodnii@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#include "cursordelegate_opengl.h"
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#include "cursor.h"
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#include "kwingltexture.h"
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#include "kwinglutils.h"
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#include "renderlayer.h"
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#include "rendertarget.h"
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namespace KWin
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{
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CursorDelegateOpenGL::CursorDelegateOpenGL(QObject *parent)
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: RenderLayerDelegate(parent)
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{
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}
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CursorDelegateOpenGL::~CursorDelegateOpenGL()
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{
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}
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void CursorDelegateOpenGL::paint(RenderTarget *renderTarget, const QRegion ®ion)
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{
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if (!region.intersects(layer()->mapToGlobal(layer()->rect()))) {
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return;
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}
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auto allocateTexture = [this]() {
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const QImage img = Cursors::self()->currentCursor()->image();
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if (img.isNull()) {
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m_cursorTextureDirty = false;
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return;
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}
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m_cursorTexture.reset(new GLTexture(img));
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m_cursorTexture->setWrapMode(GL_CLAMP_TO_EDGE);
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m_cursorTextureDirty = false;
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};
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// lazy init texture cursor only in case we need software rendering
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if (!m_cursorTexture) {
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allocateTexture();
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// handle shape update on case cursor image changed
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connect(Cursors::self(), &Cursors::currentCursorChanged, this, [this]() {
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m_cursorTextureDirty = true;
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});
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} else if (m_cursorTextureDirty) {
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const QImage image = Cursors::self()->currentCursor()->image();
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if (image.size() == m_cursorTexture->size()) {
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m_cursorTexture->update(image);
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m_cursorTextureDirty = false;
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} else {
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allocateTexture();
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}
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}
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const QRect cursorRect = layer()->mapToGlobal(layer()->rect());
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QMatrix4x4 mvp;
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mvp.ortho(QRect(QPoint(0, 0), renderTarget->size() / renderTarget->devicePixelRatio()));
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mvp.translate(cursorRect.x(), cursorRect.y());
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// Don't need to call GLVertexBuffer::beginFrame() and GLVertexBuffer::endOfFrame() because
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// the GLVertexBuffer::streamingBuffer() is not being used when painting cursor.
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glEnable(GL_BLEND);
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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m_cursorTexture->bind();
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ShaderBinder binder(ShaderTrait::MapTexture);
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binder.shader()->setUniform(GLShader::ModelViewProjectionMatrix, mvp);
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m_cursorTexture->render(region, QRect(0, 0, cursorRect.width(), cursorRect.height()));
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m_cursorTexture->unbind();
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glDisable(GL_BLEND);
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}
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} // namespace KWin
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