Unable to run some of the more complex g3d demos on iPad using love11.4-ios release

[SugarRayLua]

Hello. I am a novice mobile Lua programmer (iPad) and just starting using Love2D and am especially interested in its 3D capabilities. I liked how straightforward your g3d module looked to use and tried running some of your demos on my iPad Pro which I have installed the love11.4-ios release. The moon and earth demo works fine; however, I can't run the first person shooter demo nor the Hoarder's Horrible House demo as I get the following errors:

g3d
Example: First Person Test

Error

Error validating pixel shader code:
Line 18: ERROR: '-' : wrong operand types: no operation '-' exists that takes a left-hand operand of type ' const int' and a right operand of type ' temp mediump float' (or there is no acceptable conversion)
Line 18: ERROR: '' : missing #endif
Line 18: ERROR: '' : compilation terminated
ERROR: 3 compilation errors. No code generated.

Traceback

[love "callbacks.lua"]:228: in function 'handler'
[C]: in function 'newShader'
g3d/shader.lua:33: in main chunk
[C]: in function 'require'
g3d/model.lua:27: in main chunk
[C]: in function 'require'
g3d/init.lua:23: in main chunk
[C]: in function 'require'
main.lua:6: in main chunk
[C]: in function 'require'
[C]: in function 'xpcall'
[C]: in function 'xpcall'

Separate example: Hoarder’s Horrible House of Stuff

Initial screen loads but then when tap to start the game get

Error

Error validating vertex shader code:
Line 7: ERROR: 'uniform' : cannot initialize this type of qualifier
ERROR: 1 compilation errors. No code generated.

Traceback

[love "callbacks.lua"]:228: in function 'handler'
[C]: in function 'newShader'
libs/g3d/camera.lua:26: in function 'initialize'
libs/middleclass.lua:140: in function 'new'
libs/g3d/sun.lua:5: in function 'initialize'
libs/middleclass.lua:140: in function 'new'
game.lua:238: in function 'createCamera'
game.lua:43: in function 'load'
main.lua:223: in function 'setgamestate'
menu.lua:56: in function 'update'
main.lua:84: in function 'update'
[love "callbacks.lua"]:162: in function <[love "callbacks.lua"]:144>
[C]: in function 'xpcall'

Yet, both of the above demos run fine when I run them on my desktop Mac with love-11.4 installed.

Any suggestions?

Thanks :-)

[Zach]

Unfortunately, some platforms (such as iOS) are more picky about type coercion in shaders than other platforms. In the First Person Test project, it should be as simple as changing the 1-texcoord.y expression on line 28 of shader.lua to 1.0-texcoord.y, but it would most likely be a cleaner solution to update that project to the current version of g3d instead. I can't help with the issue in Hoarder's Horrible House of Stuff because I did not make that project.

I currently don't have plans to fix this platform specific issue myself, but if you want to contribute a PR that updates First Person Test to the latest version of g3d, I would appreciate it.

[SugarRayLua]

Thanks, @groverburger, for the reply and suggestions.

I tried the two suggestions you had to try and get the First Person Test to run on my iPad using love 11.4:

1. first changed 1-texcoord.y to 1.0-texcoord.y in line 28 of shader.lua in g3d folder in First Person Test project.
   I didn't get anymore errors but I just got a black screen without anything else.

2. I swapped out the g3d folder in the First Person Test with the newer g3d folder (latest release) from the moon/earth demo which did work but I got the same result (no more errors but just a black screen without anything else).

[Zach]

I don't know what the issue would be, I don't think I can offer any more help here.

[SugarRayLua]

Okay, thank you.