label gradient

[Peter Varo]

Hello everyone,

I'm looking for a solution to create a linear gradient label in pyglet.

AFAIK the glyphs are textured GL_QUADS, so theoretically all I have to do is add 4 colors to the 4 vertices:

    # V0 and V1 are the bottom, and V2 and V3 are the top
    ('c4B', (0, 0, 0, 255, 0, 0, 0, 255, 255, 255, 255, 255, 255, 255, 255, 255))

Although pyglet.text.Label only has a single color attribute, that can only handle a single quadlet-tuple of a color.

What is the proper way of doing this?

Thanks in advance!

[Akuji FooBar]

I think the easiest way to render the label is to use an image editing program, like gimp.

[Peter Varo]

And how exactly GIMP is related to Pyglet and pyglet.text.Label?

[Akuji]

It is not. My suggestion was simply to draw the label with an image editing program, save it as a texture or an image and load it into your program.

On Sat, Oct 19, 2013 at 9:53 PM, Peter Varo <hecs...@gmail.com> wrote:

And how exactly GIMP is related to Pyglet and pyglet.text.Label?

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[Richard Jones]

I can think of three ways to achieve the goal, off the top of my head, no code written:

1. manually construct a texture using the rendered text textures generated by pyglet as the alpha channel in a texture with the gradient in the colour components. Hard.

2. use a fragment shader to combine two textures - the text render and a gradient texture. Easier.

3. use a fragment shader to generate the gradient colour to render on the fly when rendering the text texture, modulated by the colour from the text texture. Easiest.

    Richard

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["Juan J. Martínez"]

On 20/10/13 23:26, Richard Jones wrote:
> I can think of three ways to achieve the goal, off the top of my head,
> no code written:
>
> 1. manually construct a texture using the rendered text textures
> generated by pyglet as the alpha channel in a texture with the gradient
> in the colour components. Hard.
> 2. use a fragment shader to combine two textures - the text render and a
> gradient texture. Easier.
> 3. use a fragment shader to generate the gradient colour to render on
> the fly when rendering the text texture, modulated by the colour from
> the text texture. Easiest.

Bonus! if you want to play with shaders, I've found this class from
Cocos2D very useful:

http://los-cocos.googlecode.com/svn/trunk/cocos/shader.py

Regards,

Juan