drmdevice.cpp File Reference

DRM Device. More...

#include <cerrno>
#include <cstdint>
#include <cstdio>
#include <cstring>
#include <cinttypes>
#include <string>
#include <vector>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <drm_fourcc.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "config.h"
#include "drmdevice.h"
#include "drmplane.h"
#include "logger.h"
#include "videorender.h"

Go to the source code of this file.

Functions
static int	get_resources (int fd, drmModeRes **resources)
static int	TestCaps (int fd)
	Test drm capabilities.
static int	OpenDrmDevice (const char *device, drmModeRes **resources)
	Open the given device.
static int	FindDrmDevice (drmModeRes **resources)
	Find and open a suitable device with the wanted capabilities.
static std::string	ConnectorName (drmModeConnector *connector)
	Returns the connector type name if available.
static double	GetRefreshRateHz (drmModeModeInfo *modeInfo)
	Calculate the refresh rate of the given mode to get the precise value and don't use m_drmModeInfo.vrefresh.
static bool	InterlacedMode (uint32_t flags)
	Returns true, if the interlaced flag of the mode is set.
static bool	AlmostEqual (double a, double b)
	Return true, if both values are equivalent within a tolerance.
static bool	Contains (drmModeModeInfo *mode, std::vector< sDrmMode > modes)
	Test, if the given mode is included in the given array.
static void	drm_fb_destroy_callback (struct gbm_bo *bo, void *data)
	Callback function to destroy a drm buffer which stays in the gbm_bo's user data.
	__attribute__ ((weak)) union gbm_bo_handle gbm_bo_get_handle_for_plane(struct gbm_bo *bo
static int32_t	FindCrtcForEncoder (const drmModeRes *resources, const drmModeEncoder *encoder)
	Find the CRTC_ID for the given encoder.

Variables
PFNEGLGETPLATFORMDISPLAYEXTPROC	get_platform_display = NULL
PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC	get_platform_surface = NULL
static const EGLint	context_attribute_list []
int	plane

Detailed Description

DRM Device.

This file defines cDrmDevice, which keeps some functions to interact with the DRM (display) system.

Copyright

2018 by zille. All Rights Reserved.

2025 - 2026 by Andreas Baierl. All Rights Reserved.

License

AGPL-3.0-or-later

Definition in file drmdevice.cpp.

Function Documentation

__attribute__()

__attribute__

(

(weak)

)

AlmostEqual()

static bool AlmostEqual ( double  a, double  b  )

inlinestatic

Return true, if both values are equivalent within a tolerance.

Definition at line 282 of file drmdevice.cpp.

Referenced by cDrmDevice::CanHandleMode(), Contains(), and cDrmDevice::FindMode().

ConnectorName()

static std::string ConnectorName ( drmModeConnector *  connector )

static

Returns the connector type name if available.

Definition at line 199 of file drmdevice.cpp.

Referenced by cDrmDevice::FindDrmConnector(), and cDrmDevice::Init().

GetRefreshRateHz()

static double GetRefreshRateHz ( drmModeModeInfo *  modeInfo )

static

Calculate the refresh rate of the given mode to get the precise value and don't use m_drmModeInfo.vrefresh.

Parameters

modeInfo

drm mode info

Definition at line 266 of file drmdevice.cpp.

Referenced by Contains(), cDrmDevice::FindMode(), and cDrmDevice::Init().

InterlacedMode()

static bool InterlacedMode ( uint32_t  flags )

inlinestatic

Returns true, if the interlaced flag of the mode is set.

Definition at line 274 of file drmdevice.cpp.

Referenced by Contains(), cDrmDevice::FindMode(), and cDrmDevice::Init().

TestCaps()

static int TestCaps ( int  fd )

static

Test drm capabilities.

Return values

0	if all needed caps match
1	on mismatch

Definition at line 96 of file drmdevice.cpp.

Referenced by FindDrmDevice(), and OpenDrmDevice().

Variable Documentation

get_platform_display

PFNEGLGETPLATFORMDISPLAYEXTPROC get_platform_display = NULL

Definition at line 866 of file drmdevice.cpp.

Referenced by cDrmDevice::InitEGL().

get_platform_surface

PFNEGLCREATEPLATFORMWINDOWSURFACEEXTPROC get_platform_surface = NULL

Definition at line 867 of file drmdevice.cpp.

Referenced by cDrmDevice::InitEGL().

plane

int plane

Definition at line 1006 of file drmdevice.cpp.

Referenced by cGrabBuffer::FreeInput(), cDrmDevice::Init(), cGrabBuffer::Set(), and cDrmBuffer::Setup().