数组，不过是只读的。好处是他可以通过浮点坐标来访 问，且提供了线性滤波的能力。 • 在核函数中可以通过 tex3D 来读取纹理中的值。 • 之所以纹理是因为 GPU 一开始是渲染图形的专用硬件 ，会用到一些贴图等，这就是二维的纹理。 • 当输入的浮点坐标不是整数时，由 GPU 硬件提供双线 性插值（ bilerp ），比手写的高效许多。 • 当然如果是三维数组，那就是三维纹理对象，访问时是 提供三线性插值（

注意到我们的值始终是正数，因此可以用无符号的 uint8_t （可以容纳 0 到 255 ），然后把刚刚的系数 100 改小到 2 ，成功算对结果了，代价是精度损失了 不少。 • 其实 GPU 存储贴图一般也是用的定点数 uint8_t （范围从 0 到 255 ），着色器在读取的时候才会把他 转换成 float （范围从 0.0 到 1.0 ）。这就是浮点数的 量化，存储时转换成低精度的定点数，读取时再转换

3 字节才能存储。好处是这能完全兼容以前 const char * 的那套代码 ，包括 ‘ \0’ 结尾字符串都可以继续正常使用，不用全换到 wchar_t 里来。 小彭老师懒得讲了，直接粘贴图片好了 https://zhuanlan.zhihu.com/p/427488961 读写双方编码格式不同：会导致乱码 • 然而不同的编码格式之间并不兼容。 • 例如 GBK 规定“我”这个字对应的整数是

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While wai�ng for a free thread, and during func�on execu�on once a thread is available ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any alloca�ons or other interac�ons with the Julia run�me. Note that events may be coalesced, so mul�ple calls to uv_async_send that wakes up tasks wai�ng for it (by calling wait on the object) when no�fied from C by a call to uv_async_send. Wai�ng tasks are woken with an error when the object is closed (by close. Use isopen to

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While wai�ng for a free thread, and during func�on execu�on once a thread is available ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any alloca�ons or other interac�ons with the Julia run�me. Note that events may be coalesced, so mul�ple calls to uv_async_send that wakes up tasks wai�ng for it (by calling wait on the object) when no�fied from C by a call to uv_async_send. Wai�ng tasks are woken with an error when the object is closed (by close. Use isopen to

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While wai�ng for a free thread, and during func�on execu�on once a thread is available ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any alloca�ons or other interac�ons with the Julia run�me. Note that events may be coalesced, so mul�ple calls to uv_async_send that wakes up tasks wai�ng for it (by calling wait on the object) when no�fied from C by a call to uv_async_send. Wai�ng tasks are woken with an error when the object is closed (by close. Use isopen to

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While wai�ng for a free thread, and during func�on execu�on once a thread is available ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any alloca�ons or other interac�ons with the Julia run�me. Note that events may be coalesced, so mul�ple calls to uv_async_send that wakes up tasks wai�ng for it (by calling wait on the object) when no�fied from C by a call to uv_async_send. Wai�ng tasks are woken with an error when the object is closed (by close. Use isopen to

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While waiting for a free thread, and during function execution once a thread is available cond = Base.AsyncCondition() wait(cond) The callback you pass to C should only execute a ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any allocations or other interactions 336 CHAPTER 34. CALLING C AND FORTRAN CODE Note that events may be coalesced, so multiple calls to uv_async_send may result in a single wakeup notifi- cation to the condition. 34.15 More About Callbacks

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While wai�ng for a free thread, and during func�on execu�on once a thread is available ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any alloca�ons or other interac�ons with the Julia run�me. Note that events may be coalesced, so mul�ple calls to uv_async_send that wakes up tasks wai�ng for it (by calling wait on the object) when no�fied from C by a call to uv_async_send. Wai�ng tasks are woken with an error when the object is closed (by close. Use isopen to

default size of 4 is used for this. The size of the threadpool is controlled via environment variable UV_THREADPOOL_SIZE. While waiting for a free thread, and during function execution once a thread is available cond = Base.AsyncCondition() wait(cond) The callback you pass to C should only execute a ccall to :uv_async_send, passing cond.handle as the argument, taking care to avoid any allocations or other interactions 318 CHAPTER 27. CALLING C AND FORTRAN CODE Note that events may be coalesced, so multiple calls to uv_async_send may result in a single wakeup notifi- cation to the condition. 27.15 More About Callbacks