[effect] Photo FX

Hi Gigatron, I would like to know if you have ever created a shader that distinguishes the color of a graphic on the same color in the background.

For example, look at this image, the sprite is the central gray square and the background has several colors.

When the color of the sprite matches that of the background, the shader draws a black line to distinguish the sprite from the background.

Hi i understand the goal ; I am working to port glmatrix 2.7.0 to Construct2 ( working with old version 1.0.1 )

it's working with 60%. After finished i will try to meditate with samplerBack & samplerFront to blend bg and front layout ... for detect bg color with sprite like you want ...

Regards

Hello Gigatron,

is this idea than cancelled to implement litegl.js as a plugin in c2 or do you still try it?

Is there a chance to see you working on the shadertoy to c2 proggi again this year?

Shadertoy as a C2 plugin? Very interesting!

I would like to show you a demonstration ;

http://gigatron3k.free.fr//html5/C2/plugin/st/

take this shaders from st:

https://www.shadertoy.com/view/Xls3zf#

https://www.shadertoy.com/view/llfGR7#

https://www.shadertoy.com/view/Md2SDc

And so .... copy one of shader to text area and click Load Text fragment,

normally it's working.

for changing uniform ;

eg : https://www.shadertoy.com/view/Xdd3RB

after shader was copied:

change this line to : float uZoom = 10.; >> uniform float uZoom;

to create an uniform from : uZoom

and then you can change uniform name in textbox to uZoom and change the value ...

play with ..

Regards

PS: complex shaders with bitshift << or >> or newer shader are not working for me,

i need to change my gfx card :!

glmatrix is a newer version than old C2 v1.0.1;

standard derivatives enabled ; etc !

Yes! Wonderful work! I hope that this also gets ported to C3, where I do most of my shader work / shader porting. If you need a tester for that or any help, please let me know. Of course, it would be great to also see an export option for a C2 (and C3) effect addon.

Also, great to see derivatives enabled! This opens up a few new shaders for porting.

First I must finish this work and after this will see ... I have modified some c2 file... but will try this work with old glmatrix 1.0.1

You can now load your texture; and compile button is enabled; this mean you get some errors if the shader is not correct written; but test this.

Don't forget texture must Power of Two size; 2x2,4x4,8x8,16x16,32x32,64x64,128x128 and so on ....

texture(iChannel0,uv) not working for me this is the reason why it's replaced

by texture2D(iChannel0,uv) for example ;

http://gigatron3k.free.fr//html5/C2/plugin/st/

Regards

Here is simple shader example to play with uniform ;

uniform float it; void mainImage( out vec4 fragColor, in vec2 fragCoord ){ vec2 uv = fragCoord/iResolution.xy; vec3 col = texture2D(iChannel0,uv).xyz*it; fragColor = vec4(col,1.0); }

After loading texture in slot0=iChannel0 you can play with uniform

name = it ;value 0.5 for example to have an intensity of texture