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EGLFS KMS Hooks: Get rid of flashing

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Change-Id: I590572ceb0f64d3e6a1d687874d549e84f20f60a
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
This commit is contained in:
Louai Al-Khanji 2014-09-16 09:57:46 +03:00
parent fabef06f33
commit 4f25bdd21a
1 changed files with 59 additions and 45 deletions
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74
src/plugins/platforms/eglfs/qeglfshooks_kms.cpp
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@ -113,14 +113,22 @@ public:
QPlatformCursor *createCursor(QPlatformScreen *screen) const Q_DECL_OVERRIDE;
void presentBuffer() Q_DECL_OVERRIDE;
private:
bool setup_kms();
struct FrameBuffer {
FrameBuffer() : fb(0) {}
uint32_t fb;
};
static void bufferDestroyedHandler(gbm_bo *bo, void *data);
FrameBuffer *framebufferForBufferObject(gbm_bo *bo);
static void pageFlipHandler(int fd,
unsigned int sequence,
unsigned int tv_sec,
unsigned int tv_usec,
void *user_data);
private:
// device bits
QByteArray m_device;
@ -135,6 +143,10 @@ private:
// Drawing bits
gbm_surface *m_gbm_surface;
gbm_bo *m_gbm_bo_current;
gbm_bo *m_gbm_bo_next;
bool m_flipping;
bool m_mode_set;
};
static QEglKmsHooks kms_hooks;
@ -147,6 +159,10 @@ QEglKmsHooks::QEglKmsHooks()
, m_drm_encoder(Q_NULLPTR)
, m_drm_crtc(0)
, m_gbm_surface(Q_NULLPTR)
, m_gbm_bo_current(Q_NULLPTR)
, m_gbm_bo_next(Q_NULLPTR)
, m_flipping(false)
, m_mode_set(false)
{
}
@ -257,7 +273,6 @@ bool QEglKmsHooks::hasCapability(QPlatformIntegration::Capability cap) const
case QPlatformIntegration::ThreadedPixmaps:
case QPlatformIntegration::OpenGL:
case QPlatformIntegration::ThreadedOpenGL:
case QPlatformIntegration::BufferQueueingOpenGL:
return true;
default:
return false;
@ -270,7 +285,7 @@ QPlatformCursor *QEglKmsHooks::createCursor(QPlatformScreen *screen) const
return new QKmsCursor(m_gbm_device, m_dri_fd, m_drm_crtc);
}
static void gbm_bo_destroyed_callback(gbm_bo *bo, void *data)
void QEglKmsHooks::bufferDestroyedHandler(gbm_bo *bo, void *data)
{
QEglKmsHooks::FrameBuffer *fb = static_cast<QEglKmsHooks::FrameBuffer *>(data);
@ -305,11 +320,11 @@ QEglKmsHooks::FrameBuffer *QEglKmsHooks::framebufferForBufferObject(gbm_bo *bo)
return Q_NULLPTR;
}
gbm_bo_set_user_data(bo, fb.data(), gbm_bo_destroyed_callback);
gbm_bo_set_user_data(bo, fb.data(), bufferDestroyedHandler);
return fb.take();
}
static void page_flip_handler(int fd,
void QEglKmsHooks::pageFlipHandler(int fd,
unsigned int sequence,
unsigned int tv_sec,
unsigned int tv_usec,
@ -320,8 +335,17 @@ static void page_flip_handler(int fd,
Q_UNUSED(tv_sec);
Q_UNUSED(tv_usec);
QEglKmsHooks *hooks = static_cast<QEglKmsHooks *>(user_data);
if (hooks->m_gbm_bo_current)
gbm_surface_release_buffer(hooks->m_gbm_surface,
hooks->m_gbm_bo_current);
hooks->m_gbm_bo_current = hooks->m_gbm_bo_next;
hooks->m_gbm_bo_next = Q_NULLPTR;
// We are no longer flipping
*static_cast<bool *>(user_data) = false;
hooks->m_flipping = false;
}
void QEglKmsHooks::presentBuffer()
@ -331,19 +355,15 @@ void QEglKmsHooks::presentBuffer()
return;
}
if (!gbm_surface_has_free_buffers(m_gbm_surface)) {
qWarning("Out of free GBM buffers!");
return;
}
gbm_bo *front_buffer = gbm_surface_lock_front_buffer(m_gbm_surface);
if (!front_buffer) {
m_gbm_bo_next = gbm_surface_lock_front_buffer(m_gbm_surface);
if (!m_gbm_bo_next) {
qWarning("Could not lock GBM surface front buffer!");
return;
}
QEglKmsHooks::FrameBuffer *fb = framebufferForBufferObject(front_buffer);
QEglKmsHooks::FrameBuffer *fb = framebufferForBufferObject(m_gbm_bo_next);
if (!m_mode_set) {
int ret = drmModeSetCrtc(m_dri_fd,
m_drm_crtc,
fb->fb,
@ -352,43 +372,38 @@ void QEglKmsHooks::presentBuffer()
&m_drm_mode);
if (ret) {
qErrnoWarning("Could not set DRM mode!");
return;
} else {
m_mode_set = true;
}
}
bool flipping = true;
ret = drmModePageFlip(m_dri_fd,
int ret = drmModePageFlip(m_dri_fd,
m_drm_encoder->crtc_id,
fb->fb,
DRM_MODE_PAGE_FLIP_EVENT,
&flipping);
this);
if (ret) {
qErrnoWarning("Could not queue DRM page flip!");
return;
}
m_flipping = true;
drmEventContext drmEvent = {
DRM_EVENT_CONTEXT_VERSION,
Q_NULLPTR, // vblank handler
page_flip_handler // page flip handler
pageFlipHandler // page flip handler
};
fd_set fds;
FD_ZERO(&fds);
FD_SET(m_dri_fd, &fds);
time_t start, cur;
time(&start);
while (flipping && (time(&cur) < start + 1)) {
timespec v;
memset(&v, 0, sizeof(v));
v.tv_sec = start + 1 - cur;
ret = qt_safe_select(m_dri_fd + 1, &fds, Q_NULLPTR, Q_NULLPTR, &v);
while (m_flipping) {
ret = qt_safe_select(m_dri_fd + 1, &fds, Q_NULLPTR, Q_NULLPTR, Q_NULLPTR);
if (ret == 0) {
// timeout
break;
} else if (ret == -1) {
qErrnoWarning("Error while selecting on DRM fd");
break;
@ -396,8 +411,6 @@ void QEglKmsHooks::presentBuffer()
qWarning("Could not handle DRM event!");
}
}
gbm_surface_release_buffer(m_gbm_surface, front_buffer);
}
bool QEglKmsHooks::setup_kms()
@ -464,6 +477,7 @@ bool QEglKmsHooks::setup_kms()
return true;
}
QKmsCursor::QKmsCursor(gbm_device *gbm_device, int dri_fd, uint32_t crtcId)
: m_gbm_device(gbm_device)
, m_dri_fd(dri_fd)