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When I try to run the code below in my browser I receive a pop-up notification that "Vertex shader failed to pile. The error log is:
<pre>ERROR: 0:11: 'assign' : cannot convert from 'highp 3-ponent vector of float' to 'Position highp 4-ponent vector of float'
</pre>
Followed by the console error message:
"Uncaught TypeError: Failed to execute 'useProgram' on 'WebGLRenderingContext': parameter 1 is not of type 'WebGLProgram'.init @ tangram2.js:76"
I am trying to create several 2-D shapes (just one for now, as a proof of concept), each with their own buffer, so that I may translate and rotate them on the GPU individually.
"use strict";`
var canvas, gl, program;
var points = [];
var colors = [];
var shapeScale = (1/3);
/* RGBA colors */
var vertexColors = [
vec4( 0.0, 0.0, 0.0, 1.0 ), // black
vec4( 1.0, 0.0, 0.0, 1.0 ), // red
vec4( 1.0, 1.0, 0.0, 1.0 ), // yellow
vec4( 0.0, 1.0, 0.0, 1.0 ), // green
vec4( 0.0, 0.0, 1.0, 1.0 ), // blue
vec4( 1.0, 0.0, 1.0, 1.0 ), // magenta
vec4( 1.0, 1.0, 1.0, 1.0 ), // white
vec4( 0.0, 1.0, 1.0, 1.0 ) // cyan
];
/* Shader transformation matrices */
var modelViewMatrix, projectionMatrix;
/* Rotational indicies */
var LT1 = 0; /* Large triangle 01 */
var LT2 = 1; /* Large triangle 02 */
var MT1 = 2; /* Medium triangle 01 */
var ST1 = 3; /* Small triangle 01 */
var ST2 = 4; /* Small triangle 02 */
var SQR = 5; /* Square */
var PRL = 6; /* Parallelogram */
var theta = [0,0,0,0,0,0,0];
var modelViewMatrixLoc;
/* For each shape, create a vertex and color buffer */
var vLT1Buff, cLT1Buff;
var vLT2Buff, cLT2Buff;
var vMT1Buff, cMT1Buff;
var vST1Buff, cST1Buff;
var vST2Buff, cST2Buff;
var vSQRBuff, cSQRBuff;
var vPRLBuff, cPRLBuff;
/* ----------------Initialize webGL---------------- */
window.onload = function init(){
/* From robotArm.js */
canvas = document.getElementById( "gl-canvas" );
gl = WebGLUtils.setupWebGL( canvas );
if ( !gl ) { alert( "WebGL isn't available" ); }
gl.viewport( 0, 0, canvas.width, canvas.height );
gl.clearColor( 1.0, 1.0, 1.0, 1.0 );
gl.enable( gl.DEPTH_TEST );
/* Setup canvas background */
gl.viewport(0, 0, canvas.width, canvas.height);
gl.clearColor(1.0, 0.5, 0.5, 1.0);
/* Load shaders and use the resulting shader program */
program = initShaders( gl, "vertex-shader", "fragment-shader" );
gl.useProgram( program );
/* Create an initialize buffer objects */
vLT1Buff = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, vLT1Buff );
gl.bufferData( gl.ARRAY_BUFFER, flatten(points), gl.STATIC_DRAW );
var vPosition = gl.getAttribLocation( program, "vPosition" );
gl.vertexAttribPointer( vPosition, 3, gl.FLOAT, false, 0, 0 );
gl.enableVertexAttribArray( vPosition );
cLT1Buff = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, cLT1Buff );
gl.bufferData( gl.ARRAY_BUFFER, flatten(colors), gl.STATIC_DRAW );
var vColor = gl.getAttribLocation( program, "vColor" );
gl.vertexAttribPointer( vColor, 3, gl.FLOAT, false, 0, 0 );
gl.enableVertexAttribArray( vColor );
modelViewMatrixLoc = gl.getUniformLocation(program, "modelViewMatrix");
projectionMatrix = ortho(-10, 10, -10, 10, -10, 10);
gl.uniformMatrix3fv( gl.getUniformLocation(program, "projectionMatrix"), false, flatten(projectionMatrix) );
//-------------------------------------//
// Initialize Shapes //
//-------------------------------------//
var largeTriangle01 = setupTriangle( 1, Math.sqrt(2) / 2);
var largeTriangle02 = setupTriangle( 1, Math.sqrt(2) / 2);
var medTriangle01 = setupTriangle( Math.sqrt(2) / 2, 0.35);
var smallTriangle01 = setupTriangle( 0.5, 0.25);
var smallTriangle02 = setupTriangle( 0.5, 0.25);
/* Add our shapes to an array of shapes for quick access */
var shapes = [
largeTriangle01,
/*
largeTriangle02,
medTriangle01,
smallTriangle01,
smallTriangle02,
square01,
*/
];
for(var i = 0; i < shapes.length; ++i){
scaleShape( shapes[i] ); //Scale our shapes
makeShape ( shapes[i] ); //And draw them
}
render(LT1);
}//end init
/* ----------------Helper funcitons---------------- */
//TODO dont forget about Parallelogram!
/* From robotArm.js */
function scale3(a, b) {
var result = mat3();
result[0][0] = a;
result[1][1] = b;
return result;
}
/* Return an array of three points representing a triangle */
function setupTriangle(hypotenuse, height){
return [
vec4( hypotenuse / 2, height, 0.0, 1.0 ),
vec4( hypotenuse , 0, 0.0, 1.0 ),
vec4( 0, 0, 0.0, 1.0 ),
];
}//end setupTriangle
/* Return an array of four points representing a quad */
function setupRectangle(width, height){
return[
vec4( -width, height, 0.0, 1.0),
vec4( width, height, 0.0, 1.0),
vec4( width, -height, 0.0, 1.0),
vec4( -width, -height, 0.0, 1.0),
];
}//end setupRectangle
function scaleShape(shape){
for( var i = 0; i < shape.length; ++i ){
shape[i] = scale( shapeScale, shape[i] );
}
}//end scaleShape
function makeShape(shape){
if(shape.length == 3){ makeTriangle (shape); }
if(shape.length == 4){ makeQuad (shape); }
}//end makeShape
function makeTriangle(listOfPoints){
for(var i = 0; i < listOfPoints.length; ++i){
points.push(listOfPoints[i]);
}
}//end makeShape
function makeQuad(listOfPoints){
points.push( listOfPoints[0] );
points.push( listOfPoints[1] );
points.push( listOfPoints[2] );
points.push( listOfPoints[0] );
points.push( listOfPoints[2] );
points.push( listOfPoints[3] );
}//end makeShape
/* ------------------------------------------------------------------------- */
function largeTriangle01(){
// var s = scale3(1.0, 1.0, 1.0);
var instanceMatrix = translate(0.5, 0.5);
var t = mult(modelViewMatrix, instanceMatrix);
gl.uniformMatrix3fv(modelViewMatrixLoc, false, flatten(t) );
gl.drawArrays( gl.TRIANGLES, 0, points.length );
}
/* ------------------------------------------------------------------------- */
function render(shape){
gl.clear( gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT );
modelViewMatrix = rotate(theta[shape], 0, 1, 0);
switch(shape){
/* Large Triangle 01 */
case 0:
largeTriangle01();
break;
}//end switch
requestAnimFrame(render);
}//end render
My shaders are:
<script id="vertex-shader" type="x-shader/x-vertex">
attribute vec3 vPosition;
attribute vec4 vColor;
varying vec4 fColor;
uniform mat3 modelViewMatrix;
uniform mat3 projectionMatrix;
void main() {
fColor = vColor;
gl_Position = projectionMatrix * modelViewMatrix * vPosition;
}
</script>
<script id="fragment-shader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 fColor;
void main() {
gl_FragColor = fColor;
}
</script>
When I try to run the code below in my browser I receive a pop-up notification that "Vertex shader failed to pile. The error log is:
<pre>ERROR: 0:11: 'assign' : cannot convert from 'highp 3-ponent vector of float' to 'Position highp 4-ponent vector of float'
</pre>
Followed by the console error message:
"Uncaught TypeError: Failed to execute 'useProgram' on 'WebGLRenderingContext': parameter 1 is not of type 'WebGLProgram'.init @ tangram2.js:76"
I am trying to create several 2-D shapes (just one for now, as a proof of concept), each with their own buffer, so that I may translate and rotate them on the GPU individually.
"use strict";`
var canvas, gl, program;
var points = [];
var colors = [];
var shapeScale = (1/3);
/* RGBA colors */
var vertexColors = [
vec4( 0.0, 0.0, 0.0, 1.0 ), // black
vec4( 1.0, 0.0, 0.0, 1.0 ), // red
vec4( 1.0, 1.0, 0.0, 1.0 ), // yellow
vec4( 0.0, 1.0, 0.0, 1.0 ), // green
vec4( 0.0, 0.0, 1.0, 1.0 ), // blue
vec4( 1.0, 0.0, 1.0, 1.0 ), // magenta
vec4( 1.0, 1.0, 1.0, 1.0 ), // white
vec4( 0.0, 1.0, 1.0, 1.0 ) // cyan
];
/* Shader transformation matrices */
var modelViewMatrix, projectionMatrix;
/* Rotational indicies */
var LT1 = 0; /* Large triangle 01 */
var LT2 = 1; /* Large triangle 02 */
var MT1 = 2; /* Medium triangle 01 */
var ST1 = 3; /* Small triangle 01 */
var ST2 = 4; /* Small triangle 02 */
var SQR = 5; /* Square */
var PRL = 6; /* Parallelogram */
var theta = [0,0,0,0,0,0,0];
var modelViewMatrixLoc;
/* For each shape, create a vertex and color buffer */
var vLT1Buff, cLT1Buff;
var vLT2Buff, cLT2Buff;
var vMT1Buff, cMT1Buff;
var vST1Buff, cST1Buff;
var vST2Buff, cST2Buff;
var vSQRBuff, cSQRBuff;
var vPRLBuff, cPRLBuff;
/* ----------------Initialize webGL---------------- */
window.onload = function init(){
/* From robotArm.js */
canvas = document.getElementById( "gl-canvas" );
gl = WebGLUtils.setupWebGL( canvas );
if ( !gl ) { alert( "WebGL isn't available" ); }
gl.viewport( 0, 0, canvas.width, canvas.height );
gl.clearColor( 1.0, 1.0, 1.0, 1.0 );
gl.enable( gl.DEPTH_TEST );
/* Setup canvas background */
gl.viewport(0, 0, canvas.width, canvas.height);
gl.clearColor(1.0, 0.5, 0.5, 1.0);
/* Load shaders and use the resulting shader program */
program = initShaders( gl, "vertex-shader", "fragment-shader" );
gl.useProgram( program );
/* Create an initialize buffer objects */
vLT1Buff = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, vLT1Buff );
gl.bufferData( gl.ARRAY_BUFFER, flatten(points), gl.STATIC_DRAW );
var vPosition = gl.getAttribLocation( program, "vPosition" );
gl.vertexAttribPointer( vPosition, 3, gl.FLOAT, false, 0, 0 );
gl.enableVertexAttribArray( vPosition );
cLT1Buff = gl.createBuffer();
gl.bindBuffer( gl.ARRAY_BUFFER, cLT1Buff );
gl.bufferData( gl.ARRAY_BUFFER, flatten(colors), gl.STATIC_DRAW );
var vColor = gl.getAttribLocation( program, "vColor" );
gl.vertexAttribPointer( vColor, 3, gl.FLOAT, false, 0, 0 );
gl.enableVertexAttribArray( vColor );
modelViewMatrixLoc = gl.getUniformLocation(program, "modelViewMatrix");
projectionMatrix = ortho(-10, 10, -10, 10, -10, 10);
gl.uniformMatrix3fv( gl.getUniformLocation(program, "projectionMatrix"), false, flatten(projectionMatrix) );
//-------------------------------------//
// Initialize Shapes //
//-------------------------------------//
var largeTriangle01 = setupTriangle( 1, Math.sqrt(2) / 2);
var largeTriangle02 = setupTriangle( 1, Math.sqrt(2) / 2);
var medTriangle01 = setupTriangle( Math.sqrt(2) / 2, 0.35);
var smallTriangle01 = setupTriangle( 0.5, 0.25);
var smallTriangle02 = setupTriangle( 0.5, 0.25);
/* Add our shapes to an array of shapes for quick access */
var shapes = [
largeTriangle01,
/*
largeTriangle02,
medTriangle01,
smallTriangle01,
smallTriangle02,
square01,
*/
];
for(var i = 0; i < shapes.length; ++i){
scaleShape( shapes[i] ); //Scale our shapes
makeShape ( shapes[i] ); //And draw them
}
render(LT1);
}//end init
/* ----------------Helper funcitons---------------- */
//TODO dont forget about Parallelogram!
/* From robotArm.js */
function scale3(a, b) {
var result = mat3();
result[0][0] = a;
result[1][1] = b;
return result;
}
/* Return an array of three points representing a triangle */
function setupTriangle(hypotenuse, height){
return [
vec4( hypotenuse / 2, height, 0.0, 1.0 ),
vec4( hypotenuse , 0, 0.0, 1.0 ),
vec4( 0, 0, 0.0, 1.0 ),
];
}//end setupTriangle
/* Return an array of four points representing a quad */
function setupRectangle(width, height){
return[
vec4( -width, height, 0.0, 1.0),
vec4( width, height, 0.0, 1.0),
vec4( width, -height, 0.0, 1.0),
vec4( -width, -height, 0.0, 1.0),
];
}//end setupRectangle
function scaleShape(shape){
for( var i = 0; i < shape.length; ++i ){
shape[i] = scale( shapeScale, shape[i] );
}
}//end scaleShape
function makeShape(shape){
if(shape.length == 3){ makeTriangle (shape); }
if(shape.length == 4){ makeQuad (shape); }
}//end makeShape
function makeTriangle(listOfPoints){
for(var i = 0; i < listOfPoints.length; ++i){
points.push(listOfPoints[i]);
}
}//end makeShape
function makeQuad(listOfPoints){
points.push( listOfPoints[0] );
points.push( listOfPoints[1] );
points.push( listOfPoints[2] );
points.push( listOfPoints[0] );
points.push( listOfPoints[2] );
points.push( listOfPoints[3] );
}//end makeShape
/* ------------------------------------------------------------------------- */
function largeTriangle01(){
// var s = scale3(1.0, 1.0, 1.0);
var instanceMatrix = translate(0.5, 0.5);
var t = mult(modelViewMatrix, instanceMatrix);
gl.uniformMatrix3fv(modelViewMatrixLoc, false, flatten(t) );
gl.drawArrays( gl.TRIANGLES, 0, points.length );
}
/* ------------------------------------------------------------------------- */
function render(shape){
gl.clear( gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT );
modelViewMatrix = rotate(theta[shape], 0, 1, 0);
switch(shape){
/* Large Triangle 01 */
case 0:
largeTriangle01();
break;
}//end switch
requestAnimFrame(render);
}//end render
My shaders are:
<script id="vertex-shader" type="x-shader/x-vertex">
attribute vec3 vPosition;
attribute vec4 vColor;
varying vec4 fColor;
uniform mat3 modelViewMatrix;
uniform mat3 projectionMatrix;
void main() {
fColor = vColor;
gl_Position = projectionMatrix * modelViewMatrix * vPosition;
}
</script>
<script id="fragment-shader" type="x-shader/x-fragment">
precision mediump float;
varying vec4 fColor;
void main() {
gl_FragColor = fColor;
}
</script>
-
3
The error message tells you exactly what the problem is. You're trying to assign a
vec3togl_Position, which is avec4. – Reto Koradi Commented Feb 13, 2016 at 5:03
1 Answer
Reset to default 1As @Reto said,
the error message tells you exactly what the problem is. You're trying to assign a
vec3togl_Position, which is avec4
It even tells you the line number: ERROR: 0:11 line 11
If we number the lines
<script id="vertex-shader" type="x-shader/x-vertex">1
2 attribute vec3 vPosition;
3 attribute vec4 vColor;
4 varying vec4 fColor;
5
6 uniform mat3 modelViewMatrix;
7 uniform mat3 projectionMatrix;
8
9 void main() {
10 fColor = vColor;
11 gl_Position = projectionMatrix * modelViewMatrix * vPosition;
12 }
</script>
I'm guessing you want
gl_Position = vec4(projectionMatrix * modelViewMatrix * vPosition, 1);
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