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Re: [Public WebGL] After installing latest Minefield : VertexAttribPointer: index out of range

2010/10/18 Vladimir Vukicevic <vladimir@mozilla.com>

----- Original Message -----
> 2010/10/18 Vladimir Vukicevic <vladimir@mozilla.com>:
> > Do you know which version you were using previously?
> >
> I just installed Firefox 4.0b3 and : it works with that.
> >Also, what are the arguments to the VertexAttribPointer call?
> shaderProgram.normal = gl.getAttribLocation(shaderProgram, "normal");
> gl.enableVertexAttribArray(shaderProgram.normal);
> ...
> gl.bindBuffer(gl.ARRAY_BUFFER, this.normalBuffer);
> gl.vertexAttribPointer(shaderProgram.normal, 3, gl.FLOAT, false, 0,
> 0);
> just above the bindBuffer i got a binding for positions, which is
> working without problems:
> gl.bindBuffer(gl.ARRAY_BUFFER, this.positionBuffer);
> gl.vertexAttribPointer(shaderProgram.position, 3, gl.FLOAT, false, 0,
> 0);

Yep, though I would dump the values of shaderProgram.normal and shaderProgram.position.  If the attrib isn't actually in use by the program, then getAttribLocation will return -1.  Regardless, this will raise a GL error, but shouldn't have any effect on the rendering.

> > The two problems are likely seperate -- getAttribLocation is
> > returning -1 (that is, saying that the attrib isn't in use by the
> > program), so calling VertexAttribPointer with -1 as a location is
> > invalid. However, this is likely not the cause of your error.
> >
> var normalMatrix=mat4.inverse(mvMatrix);
> normalMatrix=mat4.transpose(normalMatrix)
> gl.uniformMatrix4fv(shaderProgram.nMatrixUniform, false,
> normalMatrix); //At this point the UniformMatrix4fv error comes
> along..

Is shaderProgram.nMatrixUniform null?
Yes, it is null, see: 

shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "projectionMatrix");
alert(shaderProgram.nMatrixUniform);  //OUTPUT: not null
shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "normalMatrix");
alert(shaderProgram.nMatrixUniform);  //OUTPUT: null

Actually it is similar to the stuff with shaderProgram.pMatrixUniform..
 If so, then same case as the -1 -- for whatever reason, the shader compiler doesn't think that the particular uniform is actually in use by the program.  Note that these might be related -- they have to do with the normal matrix uniform as well as your normal array, so sounds like that's being optimized/compiled out for some reason.  Can you post the shader program in question?

That is the shader program code:

var shaderProgram;
function initShaders() {
     var fragmentShader = getShader(gl, "shader-fs");
     var vertexShader = getShader(gl, "shader-vs");

     shaderProgram = gl.createProgram();
     gl.attachShader(shaderProgram, vertexShader);
     gl.attachShader(shaderProgram, fragmentShader);

     if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
       alert("Could not initialise shaders");


     shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "vertexPosition");

     shaderProgram.vertexNormalAttribute = gl.getAttribLocation(shaderProgram, "vertexNormal");

     shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "projectionsMatrix");
     shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "modelViewMatrix");
     shaderProgram.ambientLight = gl.getUniformLocation(shaderProgram, "ambientLight");
     shaderProgram.farbe = gl.getUniformLocation(shaderProgram, "color");
     shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "normalMatrix");
     alert(shaderProgram.pMatrixUniform);  //OUTPUT: null