- Describing on which device the buffer has been allocated on is not enough: on some setups the buffer may have been allocated on one device but may still be directly accessible without any move on another device. For instance, on a split render/display system, a buffer allocated on the display device can be directly rendered to from the render device.
Luc Ma lucmann
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| F2 | Rename Symbol | |
|---|---|---|
| Ctrl-F4 | Close Editing File | |
| Ctrl-R | Recently Opened | |
| Ctrl-Shift-F | Global Search | |
| Ctrl-Shift-J | Toggle Search Details box (files to include/exclude) |
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| SRCS := $(wildcard *.json) | |
| OBJS := $(patsubst %.json,%.svg, $(SRCS)) | |
| all: $(OBJS) | |
| $(OBJS): %.svg: %.json | |
| npx bit-field --hspace 1800 --lanes $(shell echo $< | grep -o -E '[0-9]*') --vflip --hflip -i $< > $@ | |
| clean: | |
| rm -f $(OBJS) |
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| fails=(); for i in `seq 1 8`; do fails+=("$i"); done; echo "${fails[@]}" |
- 默认输出是 stderr, 而不是 stdout
-o 1.log -ff每个进程生成单独的文件，后缀是 $PID
- Interact Methods (open/close, ioctls, mmap)
- DMABUF (V4L2 Streaming I/O)
- Image Formats
- v4l2_pix_format vs drm_format (V4L2_PIX_FMT_ in videodev2.h vs DRM_FORMAT_ in drm_fourcc.h)
- FourCC (Four Character Codes)
- ColorSpaces
- Depth Format (V4L2_PIX_FMT_Z16 vs DRM 没有 Depth Format)
- Popular Data Formats
- RGB565
- Platform-specific Device Support
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| Node: /dev/dri/card0 | |
| ├───Driver: vkms (Virtual Kernel Mode Setting) version 1.0.0 (20180514) | |
| │ ├───DRM_CLIENT_CAP_STEREO_3D supported | |
| │ ├───DRM_CLIENT_CAP_UNIVERSAL_PLANES supported | |
| │ ├───DRM_CLIENT_CAP_ATOMIC supported | |
| │ ├───DRM_CLIENT_CAP_ASPECT_RATIO supported | |
| │ ├───DRM_CLIENT_CAP_WRITEBACK_CONNECTORS supported | |
| │ ├───DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT not supported | |
| │ ├───DRM_CAP_DUMB_BUFFER = 1 | |
| │ ├───DRM_CAP_VBLANK_HIGH_CRTC = 1 |
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| /* | |
| * This file generated automatically from dri3.xml by c_client.py. | |
| * Edit at your peril. | |
| */ | |
| #ifdef HAVE_CONFIG_H | |
| #include "config.h" | |
| #endif | |
| #include <stdlib.h> | |
| #include <string.h> |
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| dd if=/dev/zero of=/tmp/sock-ghost bs=1K seek=1 count=0 | |
| dd if=/dev/zero of=/tmp/sock-solid bs=1K count=1 |
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