tabvaranjr

tabvaranjr

Hands-on Rust: Rendering issues with entities

Hi there! I’ve finished the book last Friday. Good work! It’s a very good introduction to Rust and I really enjoyed it.

I have noticed that some entities are rendering incorrectly. Take a good look at the sprites at page 254 and compare them with the sprites at pages 98 and 99 (beta 5 of the book). For instance, the potion lacks liquid and the scroll lacks its ribbon. I can reproduce this issue in Fedora Linux and Windows 10.

I’m pretty new to Rust but I’m quite experienced with OpenGL so I took a look at your shaders.

Here’s a magnified frame where you can clearly see the issue. You can also notice that orcs are missing their legs and their shadows.

Here’s the fragment shader used to render the tiles of the BTermBuilder::with_simple_console_no_bg() console:

The selected line is the interesting part.

Here’s a sample of the sprite texture:

I’ve sampled a texel of the potion at the right (see “Pixel Context”; the texel is the one within the square) and its RGBA value is in the red box, below the player and the letter A (pardon my lack of skills with GIMP). As you can see in the blue box, the G value is lower than 0.1, so the fragment shader discards the whole fragment. Here’s our problem.

Simply removing the selected line in the fragment shader fixes the issue. Yay!

However, you also have to adjust the terminal8x8.png font map and set the alpha of the black pixels to 0. Otherwise, you’ll get a black screen. I’ve uploaded my modified map in my repo.

Now, I can send you a PR for bracket-terminal but I’m not quite sure of the side effects for other programs than the ones in the book. I mean, this line was probably there for a reason.

Cheers!

Where Next?

Popular Pragmatic Bookshelf topics Top

johnp
Hi Brian, Looks like the api for tinydb has changed a little. Noticed while working on chapter 7 that the .purge() call to the db throws...
New
herminiotorres
Hi! I know not the intentions behind this narrative when called, on page XI: mount() |> handle_event() |> render() but the correc...
New
AleksandrKudashkin
On the page xv there is an instruction to run bin/setup from the main folder. I downloaded the source code today (12/03/21) and can’t see...
New
nicoatridge
Hi, I have just acquired Michael Fazio’s “Kotlin and Android Development” to learn about game programming for Android. I have a game in p...
New
brunogirin
When I run the coverage example to report on missing lines, I get: pytest --cov=cards --report=term-missing ch7 ERROR: usage: pytest [op...
New
brunogirin
When trying to run tox in parallel as explained on page 151, I got the following error: tox: error: argument -p/–parallel: expected one...
New
dsmith42
Hey there, I’m enjoying this book and have learned a few things alredayd. However, in Chapter 4 I believe we are meant to see the “>...
New
taguniversalmachine
Hi, I am getting an error I cannot figure out on my test. I have what I think is the exact code from the book, other than I changed “us...
New
Henrai
Hi, I’m working on the Chapter 8 of the book. After I add add the point_offset, I’m still able to see acne: In the image above, I re...
New
dtonhofer
@parrt In the context of Chapter 4.3, the grammar Java.g4, meant to parse Java 6 compilation units, no longer passes ANTLR (currently 4....
New

Other popular topics Top

ohm
Which, if any, games do you play? On what platform? I just bought (and completed) Minecraft Dungeons for my Nintendo Switch. Other than ...
New
AstonJ
Or looking forward to? :nerd_face:
New
AstonJ
I have seen the keycaps I want - they are due for a group-buy this week but won’t be delivered until October next year!!! :rofl: The Ser...
New
mafinar
Crystal recently reached version 1. I had been following it for awhile but never got to really learn it. Most languages I picked up out o...
New
gagan7995
API 4 Path: /user/following/ Method: GET Description: Returns the list of all names of people whom the user follows Response [ { ...
New
foxtrottwist
A few weeks ago I started using Warp a terminal written in rust. Though in it’s current state of development there are a few caveats (tab...
New
PragmaticBookshelf
Author Spotlight Jamis Buck @jamis This month, we have the pleasure of spotlighting author Jamis Buck, who has written Mazes for Prog...
New
PragmaticBookshelf
Author Spotlight: Sophie DeBenedetto @SophieDeBenedetto The days of the traditional request-response web application are long gone, b...
New
First poster: bot
zig/http.zig at 7cf2cbb33ef34c1d211135f56d30fe23b6cacd42 · ziglang/zig. General-purpose programming language and toolchain for maintaini...
New
AstonJ
This is cool! DEEPSEEK-V3 ON M4 MAC: BLAZING FAST INFERENCE ON APPLE SILICON We just witnessed something incredible: the largest open-s...
New

Sub Categories: