Using textures?

[Soo88]

Could anyone tell me how to load, and move a texture?
I put the file into the textures map, and it's called Billy.jpg.

Also, how can i move it around?

Thanks in advance!

[Flexi]

hey, have a look into the manual

code:


sampler sampler_billy;

shader{

  ret = tex2D(sampler_billy, uv);

}

this is the way to load and display your texture (stretched).
if you multiply the uv vector by texsize.xy*texsize_billy.zw

code:
  ret = tex2D(sampler_billy, 0.5 + (uv-0.5)*texsize.xy*texsize_billy.zw);

your texture should be scaled to its original size.

now just add a float2(offsetx,offsety) to move it around.
Moreover you can pass these values via the q1-q32 variables from the per-frame code to the shader.

code:
  ret = tex2D(sampler_billy, 0.5 + (uv-0.5)*texsize.xy*texsize_billy.zw + _qa.xy);

(with q1 = offset_x and q2 = offset_y in the per-frame code)

and as a little homework... go figure out the difference between
sampler_fc_billy,
sampler_fw_billy,
sampler_pc_billy &
sampler_pw_billy


(do you incidentally try kidding me? - the examples in the preset authoring guide are not just by accident also with "billy" or what?)

[Soo88]

yeah, i was trying to use the manual, but i didn't really understand it :P

The texture still doesn't seem to show up. This is what i've got now.

code:


[preset00]

sampler sampler_billy;

shader{ret = tex2D(sampler_billy, uv);}

ret = tex2D(sampler_billy, 0.5 + (uv-0.5)*texsize.xy*texsize_billy.zw);

[Flexi]

...

code:


sampler sampler_billy;

shader{

  ret = tex2D(sampler_billy, 0.5 + (uv-0.5)*texsize.xy*texsize_billy.zw);

}

the ret expressions were ment to be replaced.

[Soo88]

Could you maybe point me to an example of a preset that uses textures?

Thanks!

[Flexi]

[Zylot]

My "Age of Science" posted early uses moving textures, as do "My World" and "Blue Jewel" presets, for further examples

[Patsy7z7]

I think what he means is using a texture much like a sprite.

I do not believe that textures can be manipulated beyond stretching/tiling. What you are looking for is more along the lines of sprites. In which case, sprites are separate from the MilkDrop presets.

As far as i know, you cannot have a preset project a single image across the screen. Unless some very clever code has been developed without me knowing.