JoakimCh

Members
  • Content Count

    1
  • Joined

  • Last visited

  1. Hello, My goal is to update a small part of a texture the fastest way possible with WebGL2, preferably using Pixi.js v5 (RC 3 is out). Am I right that a RenderTexture is going to re-upload the whole texture whenever there is a change? (this would not be good for a big texture, hence why I am looking for another method) I'm a complete noob when it comes to OpenGL, but I've googled a bit and figured that I can use gl.texSubImage2D() to upload just the part of the texture that I need to change. I didn't find a way to get the WebGLTexture object of a PIXI.Texture, so to be able to use that command I did something like this (not the complete code): renderer.addSystem(PIXI.systems.TextureSystem) renderer.TextureSystem.contextChange() // needed to do this loader.load(main) // and could not use gl.texSubImage2D() on tex before the loader called main function main() { let tex = resources['test'].texture let imgData = new Uint8Array(32*32*4) renderer.TextureSystem.bind(tex) renderer.gl.texSubImage2D(gl.TEXTURE_2D, 0, 0, 0, 32, 32, gl.RGBA, gl.UNSIGNED_BYTE, imgData) renderer.TextureSystem.unbind(tex) } But I wish that I had the WebGLTexture available so I could avoid messing around with PIXI.systems.TextureSystem, because I don't really know much about it or when and how it should be used. I also want to read the previous data and change it, I figured it can be done with: gl.readPixels(0, 0, 32, 32, gl.RGBA, gl.UNSIGNED_BYTE, imgData) But that needs the frameBuffer to be binded first... Hence I tried to also use the PIXI.systems.FramebufferSystem, lol: renderer.framebufferSystem.bind(fb) //fb = new PIXI.Framebuffer(tex.width, tex.height).addColorTexture(0,tex) gl.readPixels(0, 0, 32, 32, gl.RGBA, gl.UNSIGNED_BYTE, imgData) But it was not that easy, I didn't even find a way to unbind it. But I guess it is not supposed to be used for my little problem...? Maybe there should be some Pixi.js functions to do this? Maybe something similar to this: texture.getPixels(x, y, width, height, ArrayBuffer) texture.setPixels(x, y, width, height, ArrayBuffer) I'm new here btw, this is my first post I don't have much Pixi.js experience yet, but I really like it.