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QUESTION
I am trying to write the following C code in Metal Shading Language inside of a kernel void
function:
ANSWER
Answered 2021-Jun-15 at 21:02Don't know about metal
specifically, but in ordinary C, you'd want to put f
and byteArray
inside a union
Here's some sample code:
QUESTION
Disclaimer: I am new to coding.
I assume my issue is within my for loop, but I am not sure what to change even after browsing answered questions on stackoverflow. So, here is my code with regards to my question:
...ANSWER
Answered 2021-Jun-14 at 20:50Try this in the for loop:
QUESTION
I'd like to dynamically update one column value in a table based on the user input in a different column. The user-editable column is quantity, and I'd like to multiply that by a price value (id = 'pmvalue') to display total price (id 'totalpmvalue') as an output.
I don't understand what javascript to use here - I've tried searching for solutions online, but haven't been able to find something that exactly corresponds to my use case (and I'm not experienced enough to understand how to adapt solutions for slightly different use cases). Any tips are greatly appreciated!
Here's my code:
...ANSWER
Answered 2021-Jun-14 at 20:12If you are going to have multiple rows, you should be using class
, not id
, the id
attribute needs to be unique in a document.
Once you fix that, you can create a listener:
QUESTION
I need to define a custom schema for the XML below. Each TABLE attribute has different columns so I want to define a different custom schema for each attribute.
...ANSWER
Answered 2021-Jun-14 at 20:04It doesn't look like It can be filtered during reading. But you can do it after:
QUESTION
Can anyone let me know why my code is not updating the graph with data when I select drop-down value? (entire GitHub code in link in comments below)
...ANSWER
Answered 2021-Jun-13 at 19:43From testing the code at the Github link you shared I think the problem is in this line where you filter your data set in the callback:
QUESTION
I have trouble understanding something about simd_packed vectors in the simd module in Swift. I use the example of float4, I hope someone can help.
My understanding is that simd_float4
is a typealias
of SIMD4< Float>
, and MemoryLayout< Float>>.alignment = 16
(bytes), hence MemoryLayout.alignment = 16
. Makes sense.
But the following I do not understand: simd_packed_float4
is also a typealias
of SIMD4
. And so MemoryLayout.alignment = 16
.
What is the point of the "packed" in simd_packed_float4
, then? Where is the "relaxed alignment" that the documentation talks about?
In the Metal Shader Language Specification (Version 2.4) (
https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf)
in Table 2.4 (p.28), it says the alignment of packed_float4
is 4 (which is also the alignment of the scalar type, float), so this IS a "relaxed alignment" (as compared to the 16). That makes sense on its own, but how do I reconcile this to the above (simd_packed_float4
is typealias of SIMD4
and MemoryLayout = 16
)?
ANSWER
Answered 2021-Jun-12 at 03:45I actually think it's impossible to achieve relaxed alignment like this with a packed type in Swift. I think Swift compiler just can't bring the alignment attributes to actual Swift interface.
I think this makes simd_packed_float4
useless in Swift.
I have made a playground to check this, and using it as it's intended doesn't work.
QUESTION
I an trying to define a custom schema for the following XML using spark and scala.
...ANSWER
Answered 2021-Jun-12 at 22:57You need to add "TABLE" type:
QUESTION
I am using a 3.5: TFT LCD display with an Arduino Uno and the library from the manufacturer, the KeDei TFT library. The library came with a bitmap font table that is huge for the small amount of memory of an Arduino Uno so I've been looking for alternatives.
What I am running into is that there doesn't seem to be a standard representation and some of the bitmap font tables I've found work fine and others display as strange doodles and marks or they display upside down or they display with letters flipped. After writing a simple application to display some of the characters, I finally realized that different bitmaps use different character orientations.
My questionWhat are the rules or standards or expected representations for the bit data for bitmap fonts? Why do there seem to be several different text character orientations used with bitmap fonts?
Thoughts about the questionAre these due to different target devices such as a Windows display driver or a Linux display driver versus a bare metal Arduino TFT LCD display driver?
What is the criteria used to determine a particular bitmap font representation as a series of unsigned char values? Are different types of raster devices such as a TFT LCD display and its controller have a different sequence of bits when drawing on the display surface by setting pixel colors?
What other possible bitmap font representations requiring a transformation which my version of the library currently doesn't offer, are there?
Is there some method other than the approach I'm using to determine what transformation is needed? I currently plug the bitmap font table into a test program and print out a set of characters to see how it looks and then fine tune the transformation by testing with the Arduino and the TFT LCD screen.
My experience thus farThe KeDei TFT library came with an a bitmap font table that was defined as
...ANSWER
Answered 2021-Jun-12 at 16:19Raster or bitmap fonts are represented in a number of different ways and there are bitmap font file standards that have been developed for both Linux and Windows. However raw data representation of bitmap fonts in programming language source code seems to vary depending on:
- the memory architecture of the target computer,
- the architecture and communication pathways to the display controller,
- character glyph height and width in pixels and
- the amount of memory for bitmap storage and what measures are taken to make that as small as possible.
A brief overview of bitmap fonts
A generic bitmap is a block of data in which individual bits are used to indicate a state of either on or off. One use of a bitmap is to store image data. Character glyphs can be created and stored as a collection of images, one for each character in the character set, so using a bitmap to encode and store each character image is a natural fit.
Bitmap fonts are bitmaps used to indicate how to display or print characters by turning on or off pixels or printing or not printing dots on a page. See Wikipedia Bitmap fonts
A bitmap font is one that stores each glyph as an array of pixels (that is, a bitmap). It is less commonly known as a raster font or a pixel font. Bitmap fonts are simply collections of raster images of glyphs. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has three sizes, and any combination of bold and italic, then there must be 12 complete sets of images.
A brief history of using bitmap fonts
The earliest user interface terminals such as teletype terminals used dot matrix printer mechanisms to print on rolls of paper. With the development of Cathode Ray Tube terminals bitmap fonts were readily transferable to that technology as dots of luminescence turned on and off by a scanning electron gun.
Earliest bitmap fonts were of a fixed height and width with the bitmap acting as a kind of stamp or pattern to print characters on the output medium, paper or display tube, with a fixed line height and a fixed line width such as the 80 columns and 24 lines of the DEC VT-100 terminal.
With increasing processing power, a more sophisticated typographical approach became available with vector fonts used to improve displayed text quality and provide improved scaling while also reducing memory required to describe the character glyphs.
In addition, while a matrix of dots or pixels worked fairly well for languages such as English, written languages with complex glyph forms were poorly served by bitmap fonts.
Representation of bitmap fonts in source code
There are a number of bitmap font file formats which provide a way to represent a bitmap font in a device independent description. For an example see Wikipedia topic - Glyph Bitmap Distribution Format
The Glyph Bitmap Distribution Format (BDF) by Adobe is a file format for storing bitmap fonts. The content takes the form of a text file intended to be human- and computer-readable. BDF is typically used in Unix X Window environments. It has largely been replaced by the PCF font format which is somewhat more efficient, and by scalable fonts such as OpenType and TrueType fonts.
Other bitmap standards such as XBM, Wikipedia topic - X BitMap, or XPM, Wikipedia topic - X PixMap, are source code components that describe bitmaps however many of these are not meant for bitmap fonts specifically but rather other graphical images such as icons, cursors, etc.
As bitmap fonts are an older format many times bitmap fonts are wrapped within another font standard such as TrueType in order to be compatible with the standard font subsystems of modern operating systems such as Linux and Windows.
However embedded systems that are running on the bare metal or using an RTOS will normally need the raw bitmap character image data in the form similar to the XBM format. See Encyclopedia of Graphics File Formats which has this example:
Following is an example of a 16x16 bitmap stored using both its X10 and X11 variations. Note that each array contains exactly the same data, but is stored using different data word types:
QUESTION
Why introduction text was overlaid by the profile image when the browser was scaled down to 650px? They suppose to show in 100% width at 650px screen. I did adjust the position of .speakers-info from absolute to relative, it seems solved the overlay problem but then all position setting got messed. Please see the code as below and advise how to solve it, thank you!
...ANSWER
Answered 2021-Jun-11 at 08:26First, yes you should change the position to relative
. Second you set the width to 100% and in combination with position: absolute
it overlaps the other content. You should set another "col" class or add a width property to the .speakers-info
below 768px. Here I didn't set the width, just changed position property and added margin to distinct the avatar from the name:
QUESTION
So i got a page with a series of switches that are based on the following values:
...ANSWER
Answered 2021-Jun-10 at 19:37You can pass setValues()
a function which updates the state based on the previous state. The function takes the previous state and returns the new state. That way, you don't have to refer to the values
defined outside of the useEffect()
hook.
For example,
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