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kwin/plugins/platforms/drm/egl_gbm_backend.cpp

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/*
KWin - the KDE window manager
This file is part of the KDE project.
SPDX-FileCopyrightText: 2015 Martin Gräßlin <mgraesslin@kde.org>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "egl_gbm_backend.h"
// kwin
#include "composite.h"
#include "drm_backend.h"
#include "drm_output.h"
#include "gbm_surface.h"
#include "logging.h"
#include "options.h"
#include "screens.h"
#include "drm_gpu.h"
// kwin libs
#include <kwinglplatform.h>
#include <kwineglimagetexture.h>
// system
#include <gbm.h>
namespace KWin
{
EglGbmBackend::EglGbmBackend(DrmBackend *drmBackend, DrmGpu *gpu)
: AbstractEglBackend()
, m_backend(drmBackend)
, m_gpu(gpu)
{
// Egl is always direct rendering.
setIsDirectRendering(true);
setSyncsToVBlank(true);
connect(m_gpu, &DrmGpu::outputEnabled, this, &EglGbmBackend::createOutput);
connect(m_gpu, &DrmGpu::outputDisabled, this, &EglGbmBackend::removeOutput);
}
EglGbmBackend::~EglGbmBackend()
{
cleanup();
}
void EglGbmBackend::cleanupSurfaces()
{
for (auto it = m_outputs.begin(); it != m_outputs.end(); ++it) {
cleanupOutput(*it);
}
m_outputs.clear();
}
void EglGbmBackend::cleanupFramebuffer(Output &output)
{
if (!output.render.framebuffer) {
return;
}
glDeleteTextures(1, &output.render.texture);
output.render.texture = 0;
glDeleteFramebuffers(1, &output.render.framebuffer);
output.render.framebuffer = 0;
}
void EglGbmBackend::cleanupOutput(Output &output)
{
cleanupFramebuffer(output);
output.output->releaseGbm();
if (output.eglSurface != EGL_NO_SURFACE) {
eglDestroySurface(eglDisplay(), output.eglSurface);
}
}
bool EglGbmBackend::initializeEgl()
{
initClientExtensions();
EGLDisplay display = eglDisplay();
// Use eglGetPlatformDisplayEXT() to get the display pointer
// if the implementation supports it.
if (display == EGL_NO_DISPLAY) {
const bool hasMesaGBM = hasClientExtension(QByteArrayLiteral("EGL_MESA_platform_gbm"));
const bool hasKHRGBM = hasClientExtension(QByteArrayLiteral("EGL_KHR_platform_gbm"));
const GLenum platform = hasMesaGBM ? EGL_PLATFORM_GBM_MESA : EGL_PLATFORM_GBM_KHR;
if (!hasClientExtension(QByteArrayLiteral("EGL_EXT_platform_base")) ||
(!hasMesaGBM && !hasKHRGBM)) {
setFailed("Missing one or more extensions between EGL_EXT_platform_base, "
"EGL_MESA_platform_gbm, EGL_KHR_platform_gbm");
return false;
}
auto device = gbm_create_device(m_gpu->fd());
if (!device) {
setFailed("Could not create gbm device");
return false;
}
m_gpu->setGbmDevice(device);
display = eglGetPlatformDisplayEXT(platform, device, nullptr);
}
if (display == EGL_NO_DISPLAY) {
return false;
}
setEglDisplay(display);
return initEglAPI();
}
void EglGbmBackend::init()
{
if (!initializeEgl()) {
setFailed("Could not initialize egl");
return;
}
if (!initRenderingContext()) {
setFailed("Could not initialize rendering context");
return;
}
initKWinGL();
initBufferAge();
initWayland();
}
bool EglGbmBackend::initRenderingContext()
{
initBufferConfigs();
if (!createContext()) {
return false;
}
const auto outputs = m_backend->drmOutputs();
for (DrmOutput *drmOutput: outputs) {
createOutput(drmOutput);
}
if (m_outputs.isEmpty()) {
qCCritical(KWIN_DRM) << "Create Window Surfaces failed";
return false;
}
// Set our first surface as the one for the abstract backend, just to make it happy.
setSurface(m_outputs.first().eglSurface);
return makeContextCurrent(m_outputs.first());
}
std::shared_ptr<GbmSurface> EglGbmBackend::createGbmSurface(const QSize &size) const
{
auto gbmSurface = std::make_shared<GbmSurface>(m_gpu->gbmDevice(),
size.width(), size.height(),
GBM_FORMAT_XRGB8888,
GBM_BO_USE_SCANOUT | GBM_BO_USE_RENDERING);
if (!gbmSurface) {
qCCritical(KWIN_DRM) << "Creating GBM surface failed";
return nullptr;
}
return gbmSurface;
}
EGLSurface EglGbmBackend::createEglSurface(std::shared_ptr<GbmSurface> gbmSurface) const
{
auto eglSurface = eglCreatePlatformWindowSurfaceEXT(eglDisplay(), config(),
(void *)(gbmSurface->surface()), nullptr);
if (eglSurface == EGL_NO_SURFACE) {
qCCritical(KWIN_DRM) << "Creating EGL surface failed";
return EGL_NO_SURFACE;
}
return eglSurface;
}
bool EglGbmBackend::resetOutput(Output &output, DrmOutput *drmOutput)
{
output.output = drmOutput;
const QSize size = drmOutput->hardwareTransforms() ? drmOutput->pixelSize() :
drmOutput->modeSize();
auto gbmSurface = createGbmSurface(size);
if (!gbmSurface) {
return false;
}
auto eglSurface = createEglSurface(gbmSurface);
if (eglSurface == EGL_NO_SURFACE) {
return false;
}
// destroy previous surface
if (output.eglSurface != EGL_NO_SURFACE) {
if (surface() == output.eglSurface) {
setSurface(eglSurface);
}
eglDestroySurface(eglDisplay(), output.eglSurface);
}
output.eglSurface = eglSurface;
output.gbmSurface = gbmSurface;
resetFramebuffer(output);
return true;
}
void EglGbmBackend::createOutput(DrmOutput *drmOutput)
{
Output newOutput;
if (resetOutput(newOutput, drmOutput)) {
connect(drmOutput, &DrmOutput::modeChanged, this,
[drmOutput, this] {
auto it = std::find_if(m_outputs.begin(), m_outputs.end(),
[drmOutput] (const auto &output) {
return output.output == drmOutput;
}
);
if (it == m_outputs.end()) {
return;
}
resetOutput(*it, drmOutput);
}
);
m_outputs << newOutput;
}
}
void EglGbmBackend::removeOutput(DrmOutput *drmOutput)
{
auto it = std::find_if(m_outputs.begin(), m_outputs.end(),
[drmOutput] (const Output &output) {
return output.output == drmOutput;
}
);
if (it == m_outputs.end()) {
return;
}
cleanupOutput(*it);
m_outputs.erase(it);
}
const float vertices[] = {
-1.0f, 1.0f,
-1.0f, -1.0f,
1.0f, -1.0f,
-1.0f, 1.0f,
1.0f, -1.0f,
1.0f, 1.0f,
};
const float texCoords[] = {
0.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f,
0.0f, 1.0f,
1.0f, 0.0f,
1.0f, 1.0f
};
bool EglGbmBackend::resetFramebuffer(Output &output)
{
cleanupFramebuffer(output);
if (output.output->hardwareTransforms()) {
// No need for an extra render target.
return true;
}
makeContextCurrent(output);
glGenFramebuffers(1, &output.render.framebuffer);
glBindFramebuffer(GL_FRAMEBUFFER, output.render.framebuffer);
GLRenderTarget::setKWinFramebuffer(output.render.framebuffer);
glGenTextures(1, &output.render.texture);
glBindTexture(GL_TEXTURE_2D, output.render.texture);
const QSize texSize = output.output->pixelSize();
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texSize.width(), texSize.height(),
0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glBindTexture(GL_TEXTURE_2D, 0);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
output.render.texture, 0);
if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
qCWarning(KWIN_DRM) << "Error: framebuffer not complete";
return false;
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
GLRenderTarget::setKWinFramebuffer(0);
return true;
}
void EglGbmBackend::initRenderTarget(Output &output)
{
if (output.render.vbo) {
// Already initialized.
return;
}
std::shared_ptr<GLVertexBuffer> vbo(new GLVertexBuffer(KWin::GLVertexBuffer::Static));
vbo->setData(6, 2, vertices, texCoords);
output.render.vbo = vbo;
}
void EglGbmBackend::renderFramebufferToSurface(Output &output)
{
if (!output.render.framebuffer) {
// No additional render target.
return;
}
initRenderTarget(output);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
GLRenderTarget::setKWinFramebuffer(0);
const auto size = output.output->modeSize();
glViewport(0, 0, size.width(), size.height());
auto shader = ShaderManager::instance()->pushShader(ShaderTrait::MapTexture);
QMatrix4x4 rotationMatrix;
rotationMatrix.rotate(output.output->rotation(), 0, 0, 1);
shader->setUniform(GLShader::ModelViewProjectionMatrix, rotationMatrix);
glBindTexture(GL_TEXTURE_2D, output.render.texture);
output.render.vbo->render(GL_TRIANGLES);
ShaderManager::instance()->popShader();
}
void EglGbmBackend::prepareRenderFramebuffer(const Output &output) const
{
// When render.framebuffer is 0 we may just reset to the screen framebuffer.
glBindFramebuffer(GL_FRAMEBUFFER, output.render.framebuffer);
GLRenderTarget::setKWinFramebuffer(output.render.framebuffer);
}
bool EglGbmBackend::makeContextCurrent(const Output &output) const
{
const EGLSurface surface = output.eglSurface;
if (surface == EGL_NO_SURFACE) {
return false;
}
if (eglMakeCurrent(eglDisplay(), surface, surface, context()) == EGL_FALSE) {
qCCritical(KWIN_DRM) << "Make Context Current failed" << eglGetError();
return false;
}
return true;
}
bool EglGbmBackend::initBufferConfigs()
{
const EGLint config_attribs[] = {
EGL_SURFACE_TYPE, EGL_WINDOW_BIT,
EGL_RED_SIZE, 1,
EGL_GREEN_SIZE, 1,
EGL_BLUE_SIZE, 1,
EGL_ALPHA_SIZE, 0,
EGL_RENDERABLE_TYPE, isOpenGLES() ? EGL_OPENGL_ES2_BIT : EGL_OPENGL_BIT,
EGL_CONFIG_CAVEAT, EGL_NONE,
EGL_NONE,
};
EGLint count;
EGLConfig configs[1024];
if (!eglChooseConfig(eglDisplay(), config_attribs, configs,
sizeof(configs) / sizeof(EGLConfig),
&count)) {
qCCritical(KWIN_DRM) << "choose config failed";
return false;
}
qCDebug(KWIN_DRM) << "EGL buffer configs count:" << count;
// Loop through all configs, choosing the first one that has suitable format.
for (EGLint i = 0; i < count; i++) {
EGLint gbmFormat;
// Query some configuration parameters, to show in debug log.
eglGetConfigAttrib(eglDisplay(), configs[i], EGL_NATIVE_VISUAL_ID, &gbmFormat);
if (KWIN_DRM().isDebugEnabled()) {
// GBM formats are declared as FOURCC code (integer from ASCII chars, so use this fact).
char gbmFormatStr[sizeof(EGLint) + 1] = {0};
memcpy(gbmFormatStr, &gbmFormat, sizeof(EGLint));
// Query number of bits for color channel.
EGLint blueSize, redSize, greenSize, alphaSize;
eglGetConfigAttrib(eglDisplay(), configs[i], EGL_RED_SIZE, &redSize);
eglGetConfigAttrib(eglDisplay(), configs[i], EGL_GREEN_SIZE, &greenSize);
eglGetConfigAttrib(eglDisplay(), configs[i], EGL_BLUE_SIZE, &blueSize);
eglGetConfigAttrib(eglDisplay(), configs[i], EGL_ALPHA_SIZE, &alphaSize);
qCDebug(KWIN_DRM) << " EGL config #" << i << " has GBM FOURCC format:" << gbmFormatStr
<< "; color sizes (RGBA order):"
<< redSize << greenSize << blueSize << alphaSize;
}
if ((gbmFormat == GBM_FORMAT_XRGB8888) || (gbmFormat == GBM_FORMAT_ARGB8888)) {
setConfig(configs[i]);
return true;
}
}
qCCritical(KWIN_DRM) << "Choosing EGL config did not return a suitable config. There were"
<< count << "configs.";
return false;
}
void EglGbmBackend::present()
{
Q_UNREACHABLE();
// Not in use. This backend does per-screen rendering.
}
static QVector<EGLint> regionToRects(const QRegion &region, AbstractWaylandOutput *output)
{
const int height = output->modeSize().height();
const QMatrix4x4 matrix = output->transformation();
QVector<EGLint> rects;
rects.reserve(region.rectCount() * 4);
for (const QRect &_rect : region) {
const QRect rect = matrix.mapRect(_rect);
rects << rect.left();
rects << height - (rect.y() + rect.height());
rects << rect.width();
rects << rect.height();
}
return rects;
}
void EglGbmBackend::aboutToStartPainting(const QRegion &damagedRegion)
{
// See EglGbmBackend::endRenderingFrameForScreen comment for the reason why we only support screenId=0
if (m_outputs.count() > 1) {
return;
}
const Output &output = m_outputs.at(0);
if (output.bufferAge > 0 && !damagedRegion.isEmpty() && supportsPartialUpdate()) {
const QRegion region = damagedRegion & output.output->geometry();
QVector<EGLint> rects = regionToRects(region, output.output);
const bool correct = eglSetDamageRegionKHR(eglDisplay(), output.eglSurface,
rects.data(), rects.count()/4);
if (!correct) {
qCWarning(KWIN_DRM) << "failed eglSetDamageRegionKHR" << eglGetError();
}
}
}
void EglGbmBackend::presentOnOutput(Output &output, const QRegion &damagedRegion)
{
if (supportsSwapBuffersWithDamage()) {
QVector<EGLint> rects = regionToRects(output.damageHistory.constFirst(), output.output);
eglSwapBuffersWithDamageEXT(eglDisplay(), output.eglSurface,
rects.data(), rects.count()/4);
} else {
eglSwapBuffers(eglDisplay(), output.eglSurface);
}
output.buffer = new DrmSurfaceBuffer(m_gpu->fd(), output.gbmSurface);
Q_EMIT output.output->outputChange(damagedRegion);
m_backend->present(output.buffer, output.output);
if (supportsBufferAge()) {
eglQuerySurface(eglDisplay(), output.eglSurface, EGL_BUFFER_AGE_EXT, &output.bufferAge);
}
}
void EglGbmBackend::screenGeometryChanged(const QSize &size)
{
Q_UNUSED(size)
// TODO, create new buffer?
}
SceneOpenGLTexturePrivate *EglGbmBackend::createBackendTexture(SceneOpenGLTexture *texture)
{
return new EglGbmTexture(texture, this);
}
QRegion EglGbmBackend::prepareRenderingFrame()
{
startRenderTimer();
return QRegion();
}
void EglGbmBackend::setViewport(const Output &output) const
{
const QSize &overall = screens()->size();
const QRect &v = output.output->geometry();
qreal scale = output.output->scale();
glViewport(-v.x() * scale, (v.height() - overall.height() + v.y()) * scale,
overall.width() * scale, overall.height() * scale);
}
QRegion EglGbmBackend::prepareRenderingForScreen(int screenId)
{
const Output &output = m_outputs.at(screenId);
makeContextCurrent(output);
prepareRenderFramebuffer(output);
setViewport(output);
if (supportsBufferAge()) {
QRegion region;
// Note: An age of zero means the buffer contents are undefined
if (output.bufferAge > 0 && output.bufferAge <= output.damageHistory.count()) {
for (int i = 0; i < output.bufferAge - 1; i++)
region |= output.damageHistory[i];
} else {
region = output.output->geometry();
}
return region;
}
return output.output->geometry();
}
void EglGbmBackend::endRenderingFrame(const QRegion &renderedRegion, const QRegion &damagedRegion)
{
Q_UNUSED(renderedRegion)
Q_UNUSED(damagedRegion)
}
void EglGbmBackend::endRenderingFrameForScreen(int screenId,
const QRegion &renderedRegion,
const QRegion &damagedRegion)
{
Output &output = m_outputs[screenId];
renderFramebufferToSurface(output);
if (damagedRegion.intersected(output.output->geometry()).isEmpty() && screenId == 0) {
// If the damaged region of a window is fully occluded, the only
// rendering done, if any, will have been to repair a reused back
// buffer, making it identical to the front buffer.
//
// In this case we won't post the back buffer. Instead we'll just
// set the buffer age to 1, so the repaired regions won't be
// rendered again in the next frame.
if (!renderedRegion.intersected(output.output->geometry()).isEmpty())
glFlush();
for (auto &output: m_outputs) {
output.bufferAge = 1;
}
return;
}
presentOnOutput(output, damagedRegion);
// Save the damaged region to history
// Note: damage history is only collected for the first screen. For any other screen full
// repaints are triggered. This is due to a limitation in Scene::paintGenericScreen which resets
// the Toplevel's repaint. So multiple calls to Scene::paintScreen as it's done in multi-output
// rendering only have correct damage information for the first screen. If we try to track
// damage nevertheless, it creates artifacts. So for the time being we work around the problem
// by only supporting buffer age on the first output. To properly support buffer age on all
// outputs the rendering needs to be refactored in general.
if (supportsBufferAge() && screenId == 0) {
if (output.damageHistory.count() > 10) {
output.damageHistory.removeLast();
}
output.damageHistory.prepend(damagedRegion.intersected(output.output->geometry()));
}
}
bool EglGbmBackend::usesOverlayWindow() const
{
return false;
}
bool EglGbmBackend::perScreenRendering() const
{
return true;
}
QSharedPointer<GLTexture> EglGbmBackend::textureForOutput(AbstractOutput *abstractOutput) const
{
const QVector<KWin::EglGbmBackend::Output>::const_iterator itOutput = std::find_if(m_outputs.begin(), m_outputs.end(),
[abstractOutput] (const auto &output) {
return output.output == abstractOutput;
}
);
if (itOutput == m_outputs.end()) {
return {};
}
DrmOutput *drmOutput = itOutput->output;
if (!drmOutput->hardwareTransforms()) {
const auto glTexture = QSharedPointer<KWin::GLTexture>::create(itOutput->render.texture, GL_RGBA8, drmOutput->pixelSize());
glTexture->setYInverted(true);
return glTexture;
}
EGLImageKHR image = eglCreateImageKHR(eglDisplay(), nullptr, EGL_NATIVE_PIXMAP_KHR, itOutput->buffer->getBo(), nullptr);
if (image == EGL_NO_IMAGE_KHR) {
qCWarning(KWIN_DRM) << "Failed to record frame: Error creating EGLImageKHR - " << glGetError();
return {};
}
return QSharedPointer<EGLImageTexture>::create(eglDisplay(), image, GL_RGBA8, drmOutput->modeSize());
}
/************************************************
* EglTexture
************************************************/
EglGbmTexture::EglGbmTexture(KWin::SceneOpenGLTexture *texture, EglGbmBackend *backend)
: AbstractEglTexture(texture, backend)
{
}
EglGbmTexture::~EglGbmTexture() = default;
}
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