Here's what you should get with xorg 3d working using vc4-kms-v3d on an RPi3: glxinfo
...
Extended renderer info (GLX_MESA_query_renderer):
Vendor: Broadcom (0x14e4)
Device: VC4 V3D 2.1 (0xffffffff)
Version: 24.1.4
Accelerated: yes
Video memory: 920MB
...
inxi -Ga
Graphics:
Device-1: bcm2835-hdmi driver: vc4_hdmi v: N/A bus-ID: N/A
chip-ID: brcm:3f902000 class-ID: hdmi
Device-2: bcm2835-vc4 driver: vc4_drm v: N/A bus-ID: N/A chip-ID: brcm:soc
class-ID: gpu
Display: server: X.org driver: X: loaded: modesetting
gpu: vc4-drm,vc4_crtc,vc4_dpi,vc4_dsi,vc4_firmware_kms,vc4_hdmi,vc4_hvs,vc4_txp,vc4_v3d,vc4_vec
display-ID: :0.0 screens: 1
Screen-1: 0 s-res: 2048x1152 s-size: <missing: xdpyinfo>
Monitor-1: HDMI-A-1 mapped: HDMI-1 model: Dell U2720Q serial: JT61X13
built: 2020 res: 2048x1152 hz: 60 dpi: 87 gamma: 1.2
size: 597x336mm (23.5x13.23") diag: 685mm (27") ratio: 16:9 modes:
max: 2048x1152 min: 720x400
API: OpenGL v: 2.1 vendor: broadcom mesa v: 24.1.4 glx-v: 1.4 es-v: 2.0
direct-render: yes renderer: VC4 V3D 2.1 device-ID: 14e4:ffffffff
memory: 898.4 MiB unified: yes