Multi pass shaders: cannot get them to work

Solar2D Advanced Graphics
#1

Hi Guys I am testing multi pass shaders without much luck.  I am following to the letter the tutorial as per this link:

https://coronalabs.com/blog/2013/10/17/tutorial-multi-pass-shaders-in-graphics-2-0/

I get an error message, originating from my main.lua that states:

File: attempt to index a boolean value

Attempt to index a boolean value

stack traceback:

    [C]: ?

    [C]: in function ‘defineEffect’

    …ments/Corona Dev/Tests/Graphics 2.0/Filters/main.lua:2: in main chunk

There seem to be something wrong in when I call graphics.defineEffect in my main:

MAIN

local effect = require( "cartoonize" ) graphics.defineEffect(effect)

CARTOONIZE.LUA

local kernel = {} kernel.language = "glsl" kernel.category = "filter" kernel.name = "cartoonize" kernel.graph = { nodes = { horizontal = { effect="filter.blurHorizontal", input1="paint1" }, vertical = { effect="filter.blurVertical", input1="horizontal" }, }, output = "vertical", }
#2

Hi Paolo,

This is very odd, since your code appears to be OK. Can you run (test) the sample project that uses multi-pass shaders? If this gives the same result, then something is really odd.

CoronaSDK > SampleCode > Graphics-Premium > FilterGraphDemo

Thanks,

Brent

#3

Brent, I am so used to write “M = {} […] return M” that I have forgotten to write “return kernel”.  Do I get the “dumb of the week prize”?

May I ask you also if it is possible to take objects as input for composite filters or only files?  If would be quite useful in a situation where the picture to apply the effect to is user defined.

#4

Hi Paolo,

This is very odd, since your code appears to be OK. Can you run (test) the sample project that uses multi-pass shaders? If this gives the same result, then something is really odd.

CoronaSDK > SampleCode > Graphics-Premium > FilterGraphDemo

Thanks,

Brent

#5

Brent, I am so used to write “M = {} […] return M” that I have forgotten to write “return kernel”.  Do I get the “dumb of the week prize”?

May I ask you also if it is possible to take objects as input for composite filters or only files?  If would be quite useful in a situation where the picture to apply the effect to is user defined.

#6

(put) return kernel (at end of the file)

#7

(put) return kernel (at end of the file)