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# flixel
  • a
    Copy code
    hx
sprite.pixels.lock();
for (x in 0...sprite.width+1){
  for (y in 0...sprite.height+1){
    sprite.pixels.setPixel32(x, y, new FlxColor(sprite.pixels.getPixel32(x, y)).getInverted());
  }
}
sprite.pixels.unlock();
  • w
  • w
  • a
    thanks
  • w
    also what are you making where these effects need to be super performant but can't be a shader?
  • s
    Copy code
    glsl
vec2 uv = openfl_TextureCoordv;
vec4 color = texture2D(bitmap, uv);
gl_FragColor = vec4(1.0 - color.rgb, 1.0)
  • s
    should work I think
  • w
    I assumed this was some image processing tool
  • a
    experimenting
  • a
    with openfl
  • w
    for?
  • a
    nothing, just to learn more about it
  • h
    to be fair, I only recently started messing with shaders at all and I still don't like using them very much... (and I was using my greyscale function to create an image that would be saved to disk)
  • s
    it's a learning curve
  • s
    but it opens up so much possibilities
  • a
    i just moved from animations to colors since ive already experimented with animations (2 months ago i think) and made this with it https://github.com/Cherif107/OpenFL-Animate/
  • a
    i honestly dont know what to do with it i just made it to learn more about openfl
  • w
    I'm just saying pixel manipulation is something to avoid at all costs
  • w
    like if there's a way to show something without it, use that, so maybe experiment with shaders if you're just bored, since they can do way more, way faster
  • w
    especially if you're fine with resorting to to color matrix filter, which is just a poor mans shader
  • b
    Hmm, speaking of avoiding pixel manipulation - any thoughts on passing a large set of values (say, a 200x200 grid of integers?) into a shader for drawing something like a minimap?
  • b
    drawing something like this using setPixels32 is... fine? but a little ugly because it has to stay at low res to be performant. I haven't really successfully gotten around to passing arrays into a shader, and not sure if it would even be significantly more performant to just generate 40k perlin noise values -> pass it into the shader -> draw the map from there
  • s
    You sadly can't pass arrays to a shader currently. This is an openfl thing though, not flixel
  • s
    Best you can do is a mat4 with is 16 values and then again it's super annoying to work with in the shader because it's not an array
  • b
    yeah, kinda what I thought 🙂
  • b
    I suppose you can reduce the number of setPixel32 calls by 3x by writing values to a texture argb, then passing the texture to a shader
  • s
    There's an openfl pull request that should allow for some more features by letting you determine the glsl version, but no one reviewed it for quite some time
  • b
    Could probably write to a texture - > pass the texture -> perform smoothing operations from within the shader to end up with a higher-res-appearing minimap
  • s
    You can also pass the camera buffer to the shader technically
  • s
    Yeah exactly
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