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[drm] Use SFML_DRM_CONNECTOR environment variable to select connector

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Allow user to set the "SFML_DRM_CONNECTOR" environment variable to
specify which DRM connector to use.  Connectors are named the same as
with the modetest command: <type>-<type_id> (e.g. HDMI-A-2, eDP-1)
This commit is contained in:
Andrew Mickelson 2024-07-08 20:26:34 -07:00
parent 15e001608a
commit 2b49ad06e1
1 changed files with 119 additions and 8 deletions
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121
src/SFML/Window/DRM/DRMContext.cpp
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@ -33,6 +33,7 @@
#include <cerrno>
#include <cstdlib>
#include <cstring>
#include <string>
#include <fcntl.h>
#include <poll.h>
#include <unistd.h>
@ -314,6 +315,74 @@ namespace
return fileDescriptor;
}
const char *getConnectorTypeName(uint32_t connector_type)
{
// Ideally we would use drmModeGetConnectorTypeName() (added in 2022 to libdrm v2.4.112) as a drop
// in replacement for this function...
//
// see: https://gitlab.freedesktop.org/mesa/drm/-/commit/50f8d517733d24fce6693ffae552f9833e2e6aa9
//
switch (connector_type)
{
case DRM_MODE_CONNECTOR_Unknown:
return "Unknown";
case DRM_MODE_CONNECTOR_VGA:
return "VGA";
case DRM_MODE_CONNECTOR_DVII:
return "DVI-I";
case DRM_MODE_CONNECTOR_DVID:
return "DVI-D";
case DRM_MODE_CONNECTOR_DVIA:
return "DVI-A";
case DRM_MODE_CONNECTOR_Composite:
return "Composite";
case DRM_MODE_CONNECTOR_SVIDEO:
return "SVIDEO";
case DRM_MODE_CONNECTOR_LVDS:
return "LVDS";
case DRM_MODE_CONNECTOR_Component:
return "Component";
case DRM_MODE_CONNECTOR_9PinDIN:
return "DIN";
case DRM_MODE_CONNECTOR_DisplayPort:
return "DP";
case DRM_MODE_CONNECTOR_HDMIA:
return "HDMI-A";
case DRM_MODE_CONNECTOR_HDMIB:
return "HDMI-B";
case DRM_MODE_CONNECTOR_TV:
return "TV";
case DRM_MODE_CONNECTOR_eDP:
return "eDP";
#ifdef DRM_MODE_CONNECTOR_VIRTUAL
case DRM_MODE_CONNECTOR_VIRTUAL:
return "Virtual";
#endif
#ifdef DRM_MODE_CONNECTOR_DSI
case DRM_MODE_CONNECTOR_DSI:
return "DSI";
#endif
#ifdef DRM_MODE_CONNECTOR_DPI
case DRM_MODE_CONNECTOR_DPI:
return "DPI";
#endif
#ifdef DRM_MODE_CONNECTOR_WRITEBACK
case DRM_MODE_CONNECTOR_WRITEBACK:
return "Writeback";
#endif
#ifdef DRM_MODE_CONNECTOR_SPI
case DRM_MODE_CONNECTOR_SPI:
return "SPI";
#endif
#ifdef DRM_MODE_CONNECTOR_USB
case DRM_MODE_CONNECTOR_USB:
return "USB";
#endif
default:
return NULL;
}
}
int initDrm()
{
if (initialized)
@ -347,19 +416,56 @@ namespace
return -1;
}
// Find a connected connector:
// Use environment variable "SFML_DRM_CONNECTOR" to select the connector to use. If
// that variable is not set, we connect to the first connected connector that we find
//
// Use the same connector naming convention as the modetest command: <type>-<type_id>
// (e.g. HDMI-A-2, eDP-1, etc.)
drmModeConnectorPtr connector = NULL;
char* connectorStr = std::getenv("SFML_DRM_CONNECTOR");
if (connectorStr && *connectorStr)
{
for (int i = 0; i < resources->count_connectors; ++i)
{
connector = drmModeGetConnector(drmNode.fileDescriptor, resources->connectors[i]);
if (connector->connection == DRM_MODE_CONNECTED)
{
// It's connected, let's use this!
std::string n;
const char *tnStr = getConnectorTypeName(connector->connector_type);
if (!tnStr) // fallback to raw value if tnStr is NULL
n = std::to_string(connector->connector_type);
else
n = tnStr;
n += "-";
n += std::to_string(connector->connector_type_id);
if (( n.compare(connectorStr) == 0 ) && ( connector->connection == DRM_MODE_CONNECTED))
break;
}
drmModeFreeConnector(connector);
connector = NULL;
}
if (!connector)
sf::err() << "Could not connect to specified SFML_DRM_CONNECTOR: " << connectorStr << std::endl;
}
// if we don't have a connector yet, find the first connected connector
if (!connector)
{
for (int i = 0; i < resources->count_connectors; ++i)
{
connector = drmModeGetConnector(drmNode.fileDescriptor, resources->connectors[i]);
if (connector->connection == DRM_MODE_CONNECTED)
// It's connected, let's use this!
break;
drmModeFreeConnector(connector);
connector = NULL;
}
}
if (!connector)
{
@ -368,6 +474,11 @@ namespace
return -1;
}
#ifdef SFML_DEBUG
const char *tnStr = getConnectorTypeName(connector->connector_type);
sf::err() << "DRM connector used: " << (tnStr ? tnStr : "Unknown") << "-" << connector->connector_type_id << std::endl;
#endif
// Find encoder:
drmModeEncoderPtr encoder = NULL;
for (int i = 0; i < resources->count_encoders; ++i)