oliviersohn/hamazed

Monorepo for a multi-player game engine, and game examples

hamazed's Issues

[Ubuntu] Occasional game freezes

On Ubuntu (18.04 at least), this bug in GLFW, makes the game occasionally freeze until the player generates an event in the window (a key-press, a mouse movement).

As a workaround, maybe posting an empty event with a small (o(ms) or o(us)) time delay will ensure that the freeze is not noticeable for the user.

Note that this bug doesn't happen on OSX.

[Compiler bug?] Infinite loop

When compiling on OSX with optimizations (stack clean && stack build with resolver lts-9.12 (ghc 8.0.2)), the program loops infinitely (400% CPU, and execution is blocked) when an animation is triggered.

The bug is visible at this commit : 9f25223 (to reproduce, shoot at a number in the game)

This branch reproduces the problem with a minimal amount of code:
https://github.com/OlivierSohn/hamazed/tree/repro-ghc-14521-A

stack version:

$ stack --version
Version 1.3.2, Git revision 3f675146590da4f3edf768b89355f798229da2a5 (4395 commits) x86_64 hpack-0.15.0

A ticket was opened concerning this potential ghc bug : https://ghc.haskell.org/trac/ghc/ticket/14521

Investigate font size issue

The algorithm determining "the maximal font size such that all characters fit within a given block" (see createFont) was developped on OSX, with a particular graphic card driver.

On Linux, and using another graphic card driver, some characters are bigger than expected : their outer borders "leak" in the incremental rendering process.

I see 2 possible sources for this behaviour:

• maybe font rasterizing, in ftgl, behaves differently on different platforms: to find out, we can compare FTGL.getFontBBox on different platforms (see testFont)
• maybe different graphic openGL drivers perform different numerical roundings on the texture.

Note that if there are some roundings that we have no control over, and that we cannot know in advance, we could either use a bigger margin in createFont or let users adjust the margin so that "it looks good on their screen".

Add screenshots

Could you please add some screenshots of the game to the README?

Cool project, though!