RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering

Question

So i'm trying to use WebGL to offload some of the data processing needed for the image later.

I have two stages, first I'm trying 'render' unsigned ints to a texture. On the second pass, I read from this texture and render to the canvas.

If i define the texture as RGBA than I have no problems. But when I change the format to RGBA32UI, I keep getting:

RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering

I reduced my shaders to a single pixel and still getting the same error.

Texture is initialized like this :

var texture = gl.createTexture();

gl.activeTexture(gl.TEXTURE0 + 0);

gl.bindTexture(gl.TEXTURE_2D, texture);

{
  var level = 0;
  var internalFormat = gl.RGBA32UI;
  var border = 0;
  var format = gl.RGBA_INTEGER;
  var type = gl.UNSIGNED_INT;
  var data = null;
  gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
    1, 1, border, format, type, data);

  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
}

var fb = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

var level = 0;
var attachmentPoint = gl.COLOR_ATTACHMENT1;
gl.framebufferTexture2D(gl.FRAMEBUFFER, attachmentPoint, gl.TEXTURE_2D, texture, level);

and inside the fragment shader I have two color types :

layout(location = FLOAT_COLOR_LOCATION) out vec4 float_color;
layout(location = UINT_COLOR_LOCATION) out uvec4 uint_color;

Thanks for the help!

gman gman · Accepted Answer · 2017-11-18T16:53:46

The issue is you're using COLOR_ATTACHMENT1 and skipping COLOR_ATTACHMENT0.

IIRC you need to start at attachment 0 and work your way up.

Also you should probably be checking the framebuffer is complete with gl.checkFramebufferStatus

Also, integer textures are not filterable so you need to change gl.LINEAR to gl.NEAREST

const gl = document.createElement("canvas").getContext("webgl2");

testAttachment(gl.COLOR_ATTACHMENT1);
testAttachment(gl.COLOR_ATTACHMENT0);

function testAttachment(attachmentPoint) {

  function createTexture() {
    var texture = gl.createTexture();

    gl.bindTexture(gl.TEXTURE_2D, texture);
    var level = 0;
    var internalFormat = gl.RGBA32UI;
    var border = 0;
    var format = gl.RGBA_INTEGER;
    var type = gl.UNSIGNED_INT;
    var data = null;
    gl.texImage2D(gl.TEXTURE_2D, level, internalFormat,
      1, 1, border, format, type, data);

    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
    gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
    return texture;
  }
  
  var texture = createTexture();

  var fb = gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);

  var level = 0;
  gl.framebufferTexture2D(gl.FRAMEBUFFER, attachmentPoint, gl.TEXTURE_2D, texture, level);

  const status = gl.checkFramebufferStatus(gl.FRAMEBUFFER);

  console.log(glEnumToString(gl, attachmentPoint), glEnumToString(gl, status));
  
  if (status !== gl.FRAMEBUFFER_COMPLETE) {
    return;
  }
  
  const vs = `#version 300 es
  void main() {
     gl_Position = vec4(0,0,0,1);
     gl_PointSize = 100.0;
  }
  `;
  const fs = `#version 300 es
  uniform highp usampler2D color;
  out uvec4 outColor;
  void main() {
    outColor = texture(color, gl_PointCoord);
  }
  `;
  
  const prg = twgl.createProgram(gl, [vs, fs]);
  gl.useProgram(prg);
  
  // need a different input texture than output texture
  const inTex = createTexture();
  
  // no need to set uniforms since they default to 0
  // so using texture unit 0
  gl.drawArrays(gl.POINTS, 0, 1);

  // check that it rendered without error
  console.log(glEnumToString(gl, gl.getError()));
}

function glEnumToString(gl, value) {
  if (value === 0) { 
    return "NONE";
  }
  for (let key in gl) {
    if (gl[key] === value) {
      return key;
    }
  }
  return "0x" + value.toString(16);
}

<script src="https://twgljs.org/dist/4.x/twgl.min.js"></script>

RENDER WARNING: texture bound to texture unit 0 is not renderable. It maybe non-power-of-2 and have incompatible texture filtering

1 Answers