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Allow rendering to a cursor plane via opt-in

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This is required for some Rockchip devices running vendor kernels.
This commit is contained in:
Cameron Gutman
2026-01-05 19:08:22 -06:00
parent ea5b062da3
commit 705cd3ddc4
1 changed files with 16 additions and 2 deletions
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18
app/streaming/video/ffmpeg-renderers/drm.cpp
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@@ -596,6 +596,19 @@ bool DrmRenderer::initialize(PDECODER_PARAMETERS params)
allowPrimaryPlane = strcmp(m_Version->name, "spacemit") != 0;
}
// Some Rockchip have a device tree that defines their only overlay plane
// as a cursor plane, so we provide an override to allow rendering to a
// cursor plane if requested.
// https://github.com/moonlight-stream/moonlight-embedded/pull/882
bool allowCursorPlane;
if (Utils::getEnvironmentVariableOverride("DRM_ALLOW_CURSOR_PLANE", &allowCursorPlane)) {
SDL_LogWarn(SDL_LOG_CATEGORY_APPLICATION,
"Using DRM_ALLOW_CURSOR_PLANE to override default plane selection logic");
}
else {
allowCursorPlane = false;
}
// Find a video plane with the required format to render on
//
// FIXME: We should check the actual DRM format in a real AVFrame rather
@@ -628,11 +641,12 @@ bool DrmRenderer::initialize(PDECODER_PARAMETERS params)
continue;
}
// Only consider overlay and primary (if allowed) planes as valid render targets
// Check if the plane is one that we're allowed to use
DrmPropertyMap props { m_DrmFd, planeRes->planes[i], DRM_MODE_OBJECT_PLANE };
if (auto type = props.property("type");
type->initialValue() != DRM_PLANE_TYPE_OVERLAY &&
(type->initialValue() != DRM_PLANE_TYPE_PRIMARY || !allowPrimaryPlane)) {
(type->initialValue() != DRM_PLANE_TYPE_PRIMARY || !allowPrimaryPlane) &&
(type->initialValue() != DRM_PLANE_TYPE_CURSOR || !allowCursorPlane)) {
drmModeFreePlane(plane);
continue;
}