Question

我得到的是“绑定到纹理单元0的纹理不可渲染。它可能不是2的幂，并且具有不兼容的纹理过滤。”将纹理加载到WebGL中的对象时出错。我尝试了所有关于StackOverflow的建议，但没有一个对我有用。我尝试更改图像文件以使尺寸为2的幂，并尝试了不同的文件格式（jpg，gif，png）。

我无法确定图像是问题还是代码中发生了什么。

片段着色器：

precision mediump float;
varying vec2 vTextureCoord;
uniform sampler2D uSampler;

void main(void) {
 gl_FragColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
}

顶点着色器：

attribute vec3 aVertexPosition;
attribute vec2 aTextureCoord;

uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;

varying vec2 vTextureCoord;

void main(void) {
  gl_Position = uPMatrix * uMVMatrix * vec4(aVertexPosition, 1.0);
  vTextureCoord = aTextureCoord;
}

initShaders（）

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


//Create the program, then attach and link 
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);

//Check for linker errors.
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
    alert("Could not initialise shaders");
}

//Attach shaderprogram to openGL context.
gl.useProgram(shaderProgram);

shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);

shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);

shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
}

纹理负荷：

var sunTexture;

function initTexture() {

sunTexture = gl.createTexture();
sunTexture.image = new Image();

sunTexture.image.onload = function() {
    handleLoadedTexture(sunTexture)
}

sunTexture.image.src = "images/leaves.jpg";  
}

function handleLoadedTexture(texture) {
   gl.bindTexture(gl.TEXTURE_2D, texture);
   gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
   gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
   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);
   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
   gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
   gl.bindTexture(gl.TEXTURE_2D, null);
}

drawScene（）-渲染并绘制对象

var mvMatrix = mat4.create();
var pMatrix = mat4.create();

function drawScene() {

  gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
  gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
  mat4.perspective(pMatrix, 45, gl.viewportWidth / gl.viewportHeight, 0.1, 100.0);


  // Render the Sun
 mat4.identity(mvMatrix);  
 mat4.translate(mvMatrix, mvMatrix, 0, 0, -7.0);
 mat4.multiply(mvMatrix, mouseRotMatrix, mvMatrix);

 gl.bindBuffer(gl.ARRAY_BUFFER, sunVertexPositionBuffer);
 gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, sunVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
 gl.bindBuffer(gl.ARRAY_BUFFER, sunVertexTextureBuffer);
 gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, sunVertexTextureBuffer.itemSize, gl.FLOAT, false, 0, 0);

 gl.activeTexture(gl.TEXTURE0);
 gl.bindTexture(gl.TEXTURE_2D, sunTexture);
 gl.uniform1i(shaderProgram.samplerUniform, 0);


setMatrixUniforms();
gl.drawArrays(gl.TRIANGLE_STRIP, 0, sunVertexPositionBuffer.numItems);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
}

initBuffers（）-设置位置和纹理缓冲区的数据

var sunVertexPositionBuffer; 
var sunVertexTextureBuffer;

function initBuffers() {

sunVertexPositionBuffer = gl.createBuffer(); 
sunVertexTextureBuffer = gl.createBuffer();


var sRadius = 4;
var slices = 25;
var stacks = 12; 
var sVertices = []; 
var count = 0;

for (t = 0 ; t < stacks ; t++ ) { 
  var phi1 = ((t)/stacks) * Math.PI;
  var phi2 = ((t+1)/stacks) * Math.PI;

for (p = 0 ; p < slices + 1; p++) { 
  var theta = ((p)/slices ) * 2 * Math.PI ; 
  var xVal = sRadius * Math.cos(theta) * Math.sin(phi1);
  var yVal = sRadius * Math.sin(theta) * Math.sin(phi1);
  var zVal = sRadius * Math.cos(phi1);

  sVertices = sVertices.concat([xVal, yVal, zVal]);
  count++;

  var xVal = sRadius * Math.cos(theta) * Math.sin(phi2);
  var yVal = sRadius * Math.sin(theta) * Math.sin(phi2);
  var zVal = sRadius * Math.cos(phi2);

  sVertices = sVertices.concat([xVal, yVal, zVal]);
  count++;
 }
}

 var textureCoords = [];

 for (t = 0; t < stacks; t++)   {
  var phi1 = ((t)/stacks);
  var phi2 = ((t+1)/stacks);

  for (p = 0; p < slices + 1; p++) {
      var theta = 1 - ( (p)/slices );

      textureCoords = textureCoords.concat([theta, phi1]);
      textureCoords = textureCoords.concat([theta, phi2]);
  }
 }      

 gl.bindBuffer(gl.ARRAY_BUFFER, sunVertexPositionBuffer);
 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(sVertices), gl.STATIC_DRAW);
 gl.bindBuffer(gl.ARRAY_BUFFER, sunVertexTextureBuffer);
 gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(textureCoords), gl.STATIC_DRAW);  

 sunVertexPositionBuffer.itemSize = 3; 
 sunVertexPositionBuffer.numItems = count 
 sunVertexTextureBuffer.itemSize = 2;
 sunVertexTextureBuffer.numItems = stacks * (slices + 1) * 2;

 gl.bindBuffer(gl.ARRAY_BUFFER, null);
}

Answer 1

问题可能是代码在图像加载之前开始渲染，直到那时纹理才不可渲染。

我的解决方案始终是从单个像素开始纹理，以便立即可渲染

 sunTexture = gl.createTexture();
 gl.bindTexture(gl.TEXTURE_2D, sunTexture);
 gl.texImage2D(gl.TEXTURE_2D, 1, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE,
               new Uint8Array([0, 0, 255, 255])); // blue

当图像加载完成后，代码将更新纹理，但直到那时它才可用。

请参见these tutorials

绑定到纹理单元0的WebGL纹理不可渲染错误

1 个答案: