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74 lines
2.5 KiB
C++
74 lines
2.5 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 "composite.h"
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#include "core/renderlayer.h"
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#include "core/rendertarget.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 "scene/cursorscene.h"
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#include <cmath>
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namespace KWin
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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()).toAlignedRect())) {
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return;
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}
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// Render the cursor scene in an offscreen render target.
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const QSize bufferSize = (Cursors::self()->currentCursor()->rect().size() * renderTarget->devicePixelRatio()).toSize();
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if (!m_texture || m_texture->size() != bufferSize) {
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m_texture = std::make_unique<GLTexture>(GL_RGBA8, bufferSize);
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m_framebuffer = std::make_unique<GLFramebuffer>(m_texture.get());
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}
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RenderTarget offscreenRenderTarget(m_framebuffer.get());
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offscreenRenderTarget.setDevicePixelRatio(renderTarget->devicePixelRatio());
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RenderLayer renderLayer(layer()->loop());
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renderLayer.setDelegate(std::make_unique<SceneDelegate>(Compositor::self()->cursorScene()));
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renderLayer.delegate()->prePaint();
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renderLayer.delegate()->paint(&offscreenRenderTarget, infiniteRegion());
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renderLayer.delegate()->postPaint();
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// Show the rendered cursor scene on the screen.
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const QRectF cursorRect = layer()->mapToGlobal(layer()->rect());
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const qreal scale = renderTarget->devicePixelRatio();
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QMatrix4x4 mvp;
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mvp.ortho(QRect(QPoint(0, 0), renderTarget->size()));
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mvp.translate(std::round(cursorRect.x() * scale), std::round(cursorRect.y() * scale));
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GLFramebuffer *fbo = std::get<GLFramebuffer *>(renderTarget->nativeHandle());
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GLFramebuffer::pushFramebuffer(fbo);
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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_texture->bind();
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ShaderBinder binder(ShaderTrait::MapTexture);
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binder.shader()->setUniform(GLShader::ModelViewProjectionMatrix, mvp);
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m_texture->render(region, cursorRect.size(), scale);
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m_texture->unbind();
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glDisable(GL_BLEND);
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GLFramebuffer::popFramebuffer();
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}
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} // namespace KWin
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