Eureka

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strace -c -w -o glmark2.strace glmark2
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% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ------------------
 55.82   14.421660          55    258416           ioctl
 16.68    4.309981          18    238578    205238 recvmsg
 14.62    3.777039          17    210879        42 futex
  5.06    1.306534          16     77652           getpid
  2.73    0.705886          21     33276           writev
  2.51    0.648318          17     36385           close
  2.40    0.620114          18     33335           ppoll
  0.04    0.011076          24       452           read
  0.04    0.009150          32       281        47 openat
  0.02    0.005639          30       187           mmap
  0.01    0.003267          28       113           munmap
  0.01    0.003240          21       152       120 readlinkat
  0.01    0.002085          26        80           mprotect
  0.01    0.002033          19       104           newfstatat
  0.01    0.001976          26        75           brk
  0.01    0.001364          71        19           recvfrom
  0.00    0.001138          54        21           clone3
  0.00    0.000778          18        43           rt_sigprocmask
  0.00    0.000679          27        25           write
  0.00    0.000645          29        22           getdents64
  0.00    0.000493         492         1           execve
  0.00    0.000323          17        18           lseek
  0.00    0.000249          20        12           getrusage
  0.00    0.000232          17        13           getrandom
  0.00    0.000163          27         6           memfd_create
  0.00    0.000150          24         6           sendmsg
  0.00    0.000136          22         6           ftruncate
  0.00    0.000131          16         8           fcntl
  0.00    0.000054          18         3           geteuid
  0.00    0.000054          18         3           getuid
  0.00    0.000047          23         2         1 faccessat
  0.00    0.000037          18         2           uname
  0.00    0.000033          32         1           socket
  0.00    0.000031          30         1           shutdown
  0.00    0.000028          27         1           connect
  0.00    0.000018          17         1           getpeername
  0.00    0.000018          17         1           sched_getaffinity
  0.00    0.000017          17         1           rt_sigaction
  0.00    0.000017          16         1           prlimit64
  0.00    0.000017          16         1           set_tid_address
  0.00    0.000016          16         1           rseq
  0.00    0.000016          16         1           set_robust_list
------ ----------- ----------- --------- --------- ------------------
100.00   25.834885          29    890185    205448 total
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Render-To-Texture 是一种十分常见和简单的渲染技术，它将纹理对象和 FBO 绑定，把场景渲染到纹理中，以便之后可以反复使用。RTT 被广泛应用在 in-game cameras(virtual camera systems), post-processing 和各种特效中。本文主要比较 RTT 技术在两种不同的渲染架构下的不同和一些思考。

rtt-on-tbr

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Xephyr /'zefə/ 是一个嵌套的 X Server, 作为 X 应用程序运行。

Start Xephyr
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Xephyr :1 -glamor -screen 1024x768 -ac -retro

Xephyr :1 -screen 1024x768 -glamor -ac -retro

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OpenGL (可能也有其它与 OpenGL 有关的)中的有些概念很相似，有些标准里也没有给出一个明确的定义，有些如果仅从字面意思理解很容易混淆，这里将平时自己查询的资料及自己的理解整理到一起，以备不时之需。

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---
title: VkSemaphore interface
---
classDiagram
    VkSemaphore ()-- vk_semaphore
    vk_object_base <|-- vk_semaphore
    vk_semaphore <|.. vk_sync
    vk_sync -- vk_sync_type
    link vk_semaphore "https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/src/vulkan/runtime/vk_semaphore.h" "vk_semaphore"
    link vk_sync "https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/src/vulkan/runtime/vk_sync.h" "vk_sync"
    link vk_sync_type "https://gitlab.freedesktop.org/mesa/mesa/-/blob/main/src/vulkan/runtime/vk_sync.h" "vk_sync_type"
    class vk_object_base{
        VK_LOADER_DATA _loader_data
        VkObjectType type
        bool client_visible
        vk_device *device
        vk_instance *instance
        util_sparse_array private_data
        char *object_name
    }
    class vk_semaphore{
        VkSemaphoreType type
        vk_sync *temporary
        vk_sync permanent
    }
    class vk_sync{
        vk_sync_type *type
        vk_sync_flags flags
    }
    class vk_sync_type{
        size_t size
        vk_sync_features features
        init() VkResult
        finish() void
        signal() VkResult
        get_value() VkResult
        reset() VkResult
        move() VkResult
        wait() VkResult
        wait_many() VkResult
        import_opaque_fd() VkResult
        export_opaque_fd() VkResult
        import_sync_file() VkResult
        export_sync_file() VkResult
        import_win32_handle() VkResult
        export_win32_handle() VkResult
        set_win32_export_params() VkResult
    }
    <<interface>> vk_sync_type
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Segfault ?

下面的程序会段错误吗？

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#include <stdio.h>

struct foo {
    long a;
};

int main(int argc, char *argv[])
{
    struct foo *f = NULL;

    printf("0x%016lx\n", &f->a);
}
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