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Gracefully exit on a shader compile error
SinisterSoft
Maintainer
If you use a shader then on some systems that shader may not compile correctly (at run-time), this will result in an error that doesn't normally return properly to your program. Here is a way of doing it 'gracefully'...
Just replace the Shader.new paramaters with your parameters.
Because 'shader' will be nil if it fails then no harm done if you set a sprite to use that nil shader, as nil will just set the shader to the Gideros default.
Hope you all find this useful.
local result,reply=pcall(Shader.new,"vShader","fShader",0,{ {name="vMatrix",type=Shader.CMATRIX,sys=Shader.SYS_WVP,vertex=true}, {name="fColor",type=Shader.CFLOAT4,sys=Shader.SYS_COLOR,vertex=false}, {name="fTexture",type=Shader.CTEXTURE,vertex=false}, }, {{name="vVertex",type=Shader.DFLOAT,mult=3,slot=0,offset=0}, {name="vColor",type=Shader.DUBYTE,mult=4,slot=1,offset=0}, {name="vTexCoord",type=Shader.DFLOAT,mult=2,slot=2,offset=0}, }) if result then shader=reply else print("shader error:",reply) end |
Because 'shader' will be nil if it fails then no harm done if you set a sprite to use that nil shader, as nil will just set the shader to the Gideros default.
Hope you all find this useful.
Likes: antix
Coder, video game industry veteran (since the '80s, ❤'s assembler), arrested - never convicted hacker (in the '90s), dad of five, he/him (if that even matters!).
https://deluxepixel.com
https://deluxepixel.com
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