Shader viewer - without .kv file

[Charly DELAROCHE]

Hey,

I just started using kivy and it's awesome! 

I've been trying to modify the shader editor example. I wanted to get rid of the .kv interface file and do everything programatically. My goal was just to run a shader and visualize it. However, I failed to do so. I can see the shader updating every frame, but nothing is displayed. 

I tried to make my code as small as possible. Could you help me on this?

Thanks!

[Elliot Garbus]

You need to add the widgets that are created in the kv file.

Or better yet, embrace and learn kv.  It is very powerful – and part of what makes kivy very productive.

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[Charly DELAROCHE]

I tried to mimic what the .kv is doing in the example code. Also to truly understand what the .kv is doing I think you should be able to reproduce it programatically, which I'm not able too.

Could you take a quick look at my code example and tell me what is wrong with it?

Thanks,

Charly

Le mercredi 5 août 2020 17:45:15 UTC+2, Elliot Garbus a écrit :

You need to add the widgets that are created in the kv file.

Or better yet, embrace and learn kv.  It is very powerful – and part of what makes kivy very productive.

 

 

From: Charly DELAROCHE
Sent: Wednesday, August 5, 2020 3:24 AM
To: Kivy users support
Subject: [kivy-users] Shader viewer - without .kv file

 

Hey,

 

I just started using kivy and it's awesome! 

I've been trying to modify the shader editor example. I wanted to get rid of the .kv interface file and do everything programatically. My goal was just to run a shader and visualize it. However, I failed to do so. I can see the shader updating every frame, but nothing is displayed. 

I tried to make my code as small as possible. Could you help me on this?

 

Thanks!

 

 

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[Elliot Garbus]

Take a look at the kv file, copied below.  Notice in ShaderEditor (what you have called ShaderRoot), there are nested BoxLayouts with widgets… I don’t see any of this in your python code.   Additionally the shader viewer sets the canvas color to white.  I don’t see the canvas of the ShaderViewer being set.

See: https://kivy.org/doc/stable/api-kivy.uix.widget.html?highlight=canvas#basic-drawing

 

<ShaderEditor>:
    viewer: viewer

    BoxLayout:
        BoxLayout:
            orientation: 'vertical'
            size_hint_x: None
            width: 350

            Label:
                text: 'Fragment Shader'
                size_hint_y: None
                height: self.texture_size[1] + 10
            CodeInput:
                text: root.fs
                lexer: GLShaderLexer()
                on_text: root.fs = args[1]

            Label:
                text: 'Vertex Shader'
                size_hint_y: None
                height: self.texture_size[1] + 10
            CodeInput:
                text: root.vs
                lexer: GLShaderLexer()
                on_text: root.vs = args[1]

        ShaderViewer:
            id: viewer
            canvas:
                Color:
                    rgb: 1, 1, 1
                Rectangle:
                    size: self.size
                    pos: self.pos
                    source: root.source

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